Maintenance: simplify top level publicip package API (#186)

* Rework current server
* Update call is blocking
* Run first update without blocking

.devcontainer/devcontainer.json

@@ -43,53 +43,6 @@
             "usePlaceholders": false
         },
         "go.lintTool": "golangci-lint",
-        "go.lintFlags": [
-            "--fast",
-            "--enable",
-            "rowserrcheck",
-            "--enable",
-            "bodyclose",
-            "--enable",
-            "dogsled",
-            "--enable",
-            "dupl",
-            "--enable",
-            "gochecknoglobals",
-            "--enable",
-            "gochecknoinits",
-            "--enable",
-            "gocognit",
-            "--enable",
-            "goconst",
-            "--enable",
-            "gocritic",
-            "--enable",
-            "gocyclo",
-            "--enable",
-            "goimports",
-            "--enable",
-            "golint",
-            "--enable",
-            "gosec",
-            "--enable",
-            "interfacer",
-            "--enable",
-            "maligned",
-            "--enable",
-            "misspell",
-            "--enable",
-            "nakedret",
-            "--enable",
-            "prealloc",
-            "--enable",
-            "scopelint",
-            "--enable",
-            "unconvert",
-            "--enable",
-            "unparam",
-            "--enable",
-            "whitespace"
-        ],
         // Golang on save
         "go.buildOnSave": "workspace",
         "go.lintOnSave": "workspace",
@@ -111,6 +64,6 @@
         "go.testFlags": [
             "-v"
         ],
-        "go.testTimeout": "600s"
+        "go.testTimeout": "5s"
     }
 }

.devcontainer/docker-compose.yml

@@ -5,8 +5,8 @@ services:
     image: qmcgaw/godevcontainer
     volumes:
       - ../:/workspace
-      - ~/.ssh:/home/vscode/.ssh:ro
-      - ~/.ssh:/root/.ssh:ro
+      - ~/.ssh:/home/vscode/.ssh
+      - ~/.ssh:/root/.ssh
       - /var/run/docker.sock:/var/run/docker.sock
     cap_add:
       - SYS_PTRACE

.dockerignore

@@ -2,9 +2,11 @@
 .git
 .github
 .vscode
+docs
 readme
 .gitignore
 config.json
 docker-compose.yml
 LICENSE
 README.md
+ui/favicon.svg

.github/ISSUE_TEMPLATE/bug.md

@@ -7,46 +7,26 @@ assignees: qdm12
 
 ---
 
+<!--
+
+YOU CAN CHAT THERE EVENTUALLY:
+
+https://github.com/qdm12/ddns-updater/discussions
+
+-->
+
 **TLDR**: *Describe your issue in a one liner here*
 
-1. Is this urgent?
+1. Is this urgent: Yes/No
+2. DNS provider(s) you use: Answer here
+3. Program version:
 
-    - [ ] Yes
-    - [x] No
-
-2. What DNS service provider(s) are you using?
-
-    - [x] Cloudflare
-    - [ ] DDNSS.de
-    - [ ] DonDominio
-    - [ ] DNSPod
-    - [ ] Dreamhost
-    - [ ] DuckDNS
-    - [ ] DynDNS
-    - [ ] GoDaddy
-    - [ ] Google
-    - [ ] He.net
-    - [ ] Infomaniak
-    - [ ] Namecheap
-    - [ ] NoIP
-
-3. What's the version of the program?
-
-    **See the line at the top of your logs**
+    <!-- See the line at the top of your logs -->
 
     `Running version latest built on 2020-03-13T01:30:06Z (commit d0f678c)`
 
-4. What are you using to run the container?
-
-    - [ ] Docker run
-    - [x] Docker Compose
-    - [ ] Kubernetes
-    - [ ] Docker stack
-    - [ ] Docker swarm
-    - [ ] Podman
-    - [ ] Other:
-
-5. Extra information
+4. What are you using to run the container: docker-compose
+5. Extra information (optional)
 
 Logs:
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -9,6 +9,12 @@ assignees: qdm12
 
 1. What's the feature?
 
-2. Why do you need this feature?
+2. Extra information?
 
-3. Extra information?
+<!--
+
+YOU CAN CHAT THERE EVENTUALLY:
+
+https://github.com/qdm12/ddns-updater/discussions
+
+-->

.github/ISSUE_TEMPLATE/help.md

@@ -7,46 +7,26 @@ assignees:
 
 ---
 
+<!--
+
+HAVE A CHAT FIRST!
+
+https://github.com/qdm12/ddns-updater/discussions
+
+-->
+
 **TLDR**: *Describe your issue in a one liner here*
 
-1. Is this urgent?
+1. Is this urgent: Yes/No
+2. DNS provider(s) you use: Answer here
+3. Program version:
 
-    - [ ] Yes
-    - [x] No
-
-2. What DNS service provider(s) are you using?
-
-    - [x] Cloudflare
-    - [ ] DDNSS.de
-    - [ ] DonDominio
-    - [ ] DNSPod
-    - [ ] Dreamhost
-    - [ ] DuckDNS
-    - [ ] DynDNS
-    - [ ] GoDaddy
-    - [ ] Google
-    - [ ] He.net
-    - [ ] Infomaniak
-    - [ ] Namecheap
-    - [ ] NoIP
-
-3. What's the version of the program?
-
-    **See the line at the top of your logs**
+    <!-- See the line at the top of your logs -->
 
     `Running version latest built on 2020-03-13T01:30:06Z (commit d0f678c)`
 
-4. What are you using to run the container?
-
-    - [ ] Docker run
-    - [x] Docker Compose
-    - [ ] Kubernetes
-    - [ ] Docker stack
-    - [ ] Docker swarm
-    - [ ] Podman
-    - [ ] Other:
-
-5. Extra information
+4. What are you using to run the container: docker-compose
+5. Extra information (optional)
 
 Logs:
 
@@ -54,9 +34,9 @@ Logs:
 
 ```
 
-Configuration file:
+Configuration file (**remove your credentials!**):
 
-```yml
+```json
 
 ```
 

.github/workflows/build.yml

@@ -1,31 +1,107 @@
-name: Docker build
+name: CI
 on:
+  push:
+    paths:
+      - .github/workflows/build.yml
+      - cmd/**
+      - internal/**
+      - pkg/**
+      - .dockerignore
+      - .golangci.yml
+      - Dockerfile
+      - go.mod
+      - go.sum
   pull_request:
-    branches: [master]
-    paths-ignore:
-      - .devcontainer
-      - .github/ISSUE_TEMPLATE
-      - .github/workflows/build-branch.yml
-      - .github/workflows/buildx-release.yml
-      - .github/workflows/buildx-latest.yml
-      - .github/workflows/dockerhub-description.yml
-      - .github/workflows/labels.yml
-      - .github/CODEOWNERS
-      - .github/CONTRIBUTING.md
-      - .github/FUNDING.yml
-      - .github/labels.yml
-      - .vscode
-      - readme
-      - .gitignore
-      - config.json
-      - docker-compose.yml
-      - LICENSE
-      - README.md
+    paths:
+      - .github/workflows/build.yml
+      - cmd/**
+      - internal/**
+      - pkg/**
+      - .dockerignore
+      - .golangci.yml
+      - Dockerfile
+      - go.mod
+      - go.sum
+
 jobs:
-  build:
+  verify:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_BUILDKIT: "1"
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Linting
+        run: docker build --target lint .
+
+      - name: Go mod tidy check
+        run: docker build --target tidy .
+
+      - name: Build test image
+        run: docker build --target test -t test-container .
+
+      - name: Run tests in test container
+        run: |
+          touch coverage.txt
+          docker run --rm \
+          -v "$(pwd)/coverage.txt:/tmp/gobuild/coverage.txt" \
+          test-container \
+          go test \
+          -race \
+          -coverpkg=./... \
+          -coverprofile=coverage.txt \
+          -covermode=atomic \
+          ./...
+
+      # We run this here to use the caching of the previous steps
+      - name: Build final image
+        run: docker build .
+
+  publish:
+    needs: [verify]
+    if: github.event_name == 'push'
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Build image
-        run: docker build .
+      - uses: actions/checkout@v2
+
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+
+      - uses: docker/login-action@v1
+        with:
+          username: qmcgaw
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Set variables
+        id: vars
+        run: |
+          BRANCH=${GITHUB_REF#refs/heads/}
+          TAG=${GITHUB_REF#refs/tags/}
+          echo ::set-output name=commit::$(git rev-parse --short HEAD)
+          echo ::set-output name=build_date::$(date -u +%Y-%m-%dT%H:%M:%SZ)
+          if [ "$TAG" != "$GITHUB_REF" ]; then
+            echo ::set-output name=version::$TAG
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/s390x,linux/ppc64le,linux/riscv64
+          elif [ "$BRANCH" = "master" ]; then
+            echo ::set-output name=version::latest
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/s390x,linux/ppc64le,linux/riscv64
+          else
+            echo ::set-output name=version::$BRANCH
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,
+          fi
+
+      - name: Build and push final image
+        uses: docker/build-push-action@v2
+        with:
+          platforms: ${{ steps.vars.outputs.platforms }}
+          build-args: |
+            BUILD_DATE=${{ steps.vars.outputs.build_date }}
+            COMMIT=${{ steps.vars.outputs.commit }}
+            VERSION=${{ steps.vars.outputs.version }}
+          tags: qmcgaw/ddns-updater:${{ steps.vars.outputs.version }}
+          push: true
+
+      - if: github.event.ref == 'refs/heads/master'
+        name: Microbadger hook
+        run: curl -X POST https://hooks.microbadger.com/images/qmcgaw/ddns-updater/t2fcZxog8ce_kJYJ61JjkYwHF5s=
+        continue-on-error: true

.github/workflows/buildx-branch.yml

@@ -1,47 +0,0 @@
-name: Buildx branch
-on:
-  push:
-    branches:
-      - '*'
-      - '*/*'
-      - '!master'
-    paths-ignore:
-      - .devcontainer
-      - .github/ISSUE_TEMPLATE
-      - .github/workflows/build.yml
-      - .github/workflows/buildx-release.yml
-      - .github/workflows/buildx-latest.yml
-      - .github/workflows/dockerhub-description.yml
-      - .github/workflows/labels.yml
-      - .github/CODEOWNERS
-      - .github/CONTRIBUTING.md
-      - .github/FUNDING.yml
-      - .github/labels.yml
-      - .vscode
-      - readme
-      - .gitignore
-      - config.json
-      - docker-compose.yml
-      - LICENSE
-      - README.md
-jobs:
-  buildx:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Buildx setup
-        uses: crazy-max/ghaction-docker-buildx@v1
-      - name: Dockerhub login
-        run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u qmcgaw --password-stdin 2>&1
-      - name: Run Buildx
-        run: |
-          docker buildx build \
-            --progress plain \
-            --platform=linux/amd64,linux/386,linux/arm64,linux/arm/v7 \
-            --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
-            --build-arg VCS_REF=`git rev-parse --short HEAD` \
-            --build-arg VERSION=${GITHUB_REF##*/} \
-            -t qmcgaw/ddns-updater:${GITHUB_REF##*/} \
-            --push \
-            .
-      - run: curl -X POST https://hooks.microbadger.com/images/qmcgaw/ddns-updater/t2fcZxog8ce_kJYJ61JjkYwHF5s= || exit 0

.github/workflows/buildx-latest.yml

@@ -1,44 +0,0 @@
-name: Buildx latest
-on:
-  push:
-    branches: [master]
-    paths-ignore:
-      - .devcontainer
-      - .github/ISSUE_TEMPLATE
-      - .github/workflows/build.yml
-      - .github/workflows/buildx-release.yml
-      - .github/workflows/buildx-branch.yml
-      - .github/workflows/dockerhub-description.yml
-      - .github/workflows/labels.yml
-      - .github/CODEOWNERS
-      - .github/CONTRIBUTING.md
-      - .github/FUNDING.yml
-      - .github/labels.yml
-      - .vscode
-      - readme
-      - .gitignore
-      - config.json
-      - docker-compose.yml
-      - LICENSE
-      - README.md
-jobs:
-  buildx:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Buildx setup
-        uses: crazy-max/ghaction-docker-buildx@v1
-      - name: Dockerhub login
-        run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u qmcgaw --password-stdin 2>&1
-      - name: Run Buildx
-        run: |
-          docker buildx build \
-            --progress plain \
-            --platform=linux/amd64,linux/386,linux/arm64,linux/arm/v7 \
-            --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
-            --build-arg VCS_REF=`git rev-parse --short HEAD` \
-            --build-arg VERSION=latest \
-            -t qmcgaw/ddns-updater:latest \
-            --push \
-            .
-      - run: curl -X POST https://hooks.microbadger.com/images/qmcgaw/ddns-updater/t2fcZxog8ce_kJYJ61JjkYwHF5s= || exit 0

.github/workflows/buildx-release.yml

@@ -1,44 +0,0 @@
-name: Buildx release
-on:
-  release:
-    types: [published]
-    paths-ignore:
-      - .devcontainer
-      - .github/ISSUE_TEMPLATE
-      - .github/workflows/build.yml
-      - .github/workflows/buildx-branch.yml
-      - .github/workflows/buildx-latest.yml
-      - .github/workflows/dockerhub-description.yml
-      - .github/workflows/labels.yml
-      - .github/CODEOWNERS
-      - .github/CONTRIBUTING.md
-      - .github/FUNDING.yml
-      - .github/labels.yml
-      - .vscode
-      - readme
-      - .gitignore
-      - config.json
-      - docker-compose.yml
-      - LICENSE
-      - README.md
-jobs:
-  buildx:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Buildx setup
-        uses: crazy-max/ghaction-docker-buildx@v1
-      - name: Dockerhub login
-        run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u qmcgaw --password-stdin 2>&1
-      - name: Run Buildx
-        run: |
-          docker buildx build \
-            --progress plain \
-            --platform=linux/amd64,linux/386,linux/arm64,linux/arm/v7 \
-            --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
-            --build-arg VCS_REF=`git rev-parse --short HEAD` \
-            --build-arg VERSION=${GITHUB_REF##*/} \
-            -t qmcgaw/ddns-updater:${GITHUB_REF##*/} \
-            --push \
-            .
-      - run: curl -X POST https://hooks.microbadger.com/images/qmcgaw/ddns-updater/t2fcZxog8ce_kJYJ61JjkYwHF5s= || exit 0

.github/workflows/labels.yml

@@ -1,10 +1,10 @@
 name: labels
 on:
   push:
-    branches: ["master"]
+    branches: [master]
     paths:
-      - '.github/labels.yml'
-      - '.github/workflows/labels.yml'
+      - .github/labels.yml
+      - .github/workflows/labels.yml
 jobs:
   labeler:
     runs-on: ubuntu-latest

.gitignore

@@ -1,3 +0,0 @@
-*.exe
-updater
-.vscode

.golangci.yml

@@ -4,33 +4,80 @@ linters-settings:
   misspell:
     locale: US
 
+issues:
+  exclude-rules:
+    - path: cmd/
+      text: buildInfo is a global variable
+      linters:
+        - gochecknoglobals
+    - path: cmd/
+      text: commit is a global variable
+      linters:
+        - gochecknoglobals
+    - path: cmd/
+      text: buildDate is a global variable
+      linters:
+        - gochecknoglobals
+    - path: cmd/updater/main.go
+      text: "mnd: Magic number: 4, in <argument> detected"
+      linters:
+        - gomnd
+    - path: cmd/updater/main.go
+      text: "mnd: Magic number: 2, in <argument> detected"
+      linters:
+        - gomnd
+    - path: internal/regex/regex.go
+      text: "regexpMust: for const patterns like "
+      linters:
+        - gocritic
+    - path: internal/settings/
+      linters:
+        - maligned
+        - dupl
+    - path: pkg/publicip/.*_test.go
+      linters:
+        - dupl
+
 linters:
   disable-all: true
   enable:
+    - asciicheck
     - bodyclose
     - deadcode
     - dogsled
     - dupl
     - errcheck
+    - exhaustive
+    - exportloopref
+    - gci
     - gochecknoglobals
     - gochecknoinits
     - gocognit
     - goconst
     - gocritic
     - gocyclo
+    - godot
+    - goheader
     - goimports
     - golint
+    - gomnd
+    - goprintffuncname
     - gosec
     - gosimple
     - govet
     - ineffassign
     - interfacer
+    - lll
     - maligned
     - misspell
     - nakedret
+    - nestif
+    - noctx
+    - nolintlint
     - prealloc
     - rowserrcheck
     - scopelint
+    - sqlclosecheck
     - staticcheck
     - structcheck
     - typecheck

.vscode/settings.json

@@ -1,88 +0,0 @@
-{
-    // General settings
-    "files.eol": "\n",
-    // Docker
-    "remote.extensionKind": {
-        "ms-azuretools.vscode-docker": "workspace"
-    },
-    // Golang general settings
-    "go.useLanguageServer": true,
-    "go.autocompleteUnimportedPackages": true,
-    "go.gotoSymbol.includeImports": true,
-    "go.gotoSymbol.includeGoroot": true,
-    "gopls": {
-        "completeUnimported": true,
-        "deepCompletion": true,
-        "usePlaceholders": false
-    },
-    "go.lintTool": "golangci-lint",
-    "go.lintFlags": [
-        "--fast",
-        "--enable",
-        "rowserrcheck",
-        "--enable",
-        "bodyclose",
-        "--enable",
-        "dogsled",
-        "--enable",
-        "dupl",
-        "--enable",
-        "gochecknoglobals",
-        "--enable",
-        "gochecknoinits",
-        "--enable",
-        "gocognit",
-        "--enable",
-        "goconst",
-        "--enable",
-        "gocritic",
-        "--enable",
-        "gocyclo",
-        "--enable",
-        "goimports",
-        "--enable",
-        "golint",
-        "--enable",
-        "gosec",
-        "--enable",
-        "interfacer",
-        "--enable",
-        "maligned",
-        "--enable",
-        "misspell",
-        "--enable",
-        "nakedret",
-        "--enable",
-        "prealloc",
-        "--enable",
-        "scopelint",
-        "--enable",
-        "unconvert",
-        "--enable",
-        "unparam",
-        "--enable",
-        "whitespace"
-    ],
-    // Golang on save
-    "go.buildOnSave": "workspace",
-    "go.lintOnSave": "workspace",
-    "go.vetOnSave": "workspace",
-    "editor.formatOnSave": true,
-    "[go]": {
-        "editor.codeActionsOnSave": {
-            "source.organizeImports": true
-        }
-    },
-    // Golang testing
-    "go.toolsEnvVars": {
-        "GOFLAGS": "-tags="
-    },
-    "gopls.env": {
-        "GOFLAGS": "-tags="
-    },
-    "go.testEnvVars": {},
-    "go.testFlags": [
-        "-v"
-    ],
-    "go.testTimeout": "600s"
-}

Dockerfile

@@ -1,41 +1,73 @@
-ARG ALPINE_VERSION=3.12
-ARG GO_VERSION=1.15
+ARG ALPINE_VERSION=3.13
+ARG GO_VERSION=1.16
+ARG BUILDPLATFORM=linux/amd64
 
-FROM alpine:${ALPINE_VERSION} AS alpine
+FROM --platform=$BUILDPLATFORM alpine:${ALPINE_VERSION} AS alpine
 RUN apk --update add ca-certificates tzdata
+RUN mkdir /tmp/data && \
+    chown 1000 /tmp/data && \
+    chmod 700 /tmp/data
 
-FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS builder
-ARG GOLANGCI_LINT_VERSION=v1.31.0
-RUN apk --update add git
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base
 ENV CGO_ENABLED=0
-RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s ${GOLANGCI_LINT_VERSION}
+RUN apk --update add git
 WORKDIR /tmp/gobuild
-COPY .golangci.yml .
+# Copy repository code and install Go dependencies
 COPY go.mod go.sum ./
 RUN go mod download
+COPY pkg/ ./pkg/
+COPY cmd/ ./cmd/
 COPY internal/ ./internal/
-COPY cmd/updater/main.go .
-RUN go test ./...
-RUN go build -trimpath -ldflags="-s -w" -o app
+
+FROM --platform=$BUILDPLATFORM base AS test
+ENV CGO_ENABLED=1
+# g++ is installed for the -race detector in go test
+RUN apk --update add g++
+
+FROM --platform=$BUILDPLATFORM base AS lint
+ARG GOLANGCI_LINT_VERSION=v1.37.0
+RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | \
+    sh -s -- -b /usr/local/bin ${GOLANGCI_LINT_VERSION}
+COPY .golangci.yml ./
 RUN golangci-lint run --timeout=10m
 
+FROM --platform=$BUILDPLATFORM base AS tidy
+RUN git init && \
+    git config user.email ci@localhost && \
+    git config user.name ci && \
+    git add -A && git commit -m ci && \
+    sed -i '/\/\/ indirect/d' go.mod && \
+    go mod tidy && \
+    git diff --exit-code -- go.mod
+
+FROM --platform=$BUILDPLATFORM base AS build
+COPY --from=qmcgaw/xcputranslate:v0.4.0 /xcputranslate /usr/local/bin/xcputranslate
+ARG TARGETPLATFORM
+ARG VERSION=unknown
+ARG BUILD_DATE="an unknown date"
+ARG COMMIT=unknown
+RUN GOARCH="$(xcputranslate -targetplatform ${TARGETPLATFORM} -field arch)" \
+    GOARM="$(xcputranslate -targetplatform ${TARGETPLATFORM} -field arm)" \
+    go build -trimpath -ldflags="-s -w \
+    -X 'main.version=$VERSION' \
+    -X 'main.buildDate=$BUILD_DATE' \
+    -X 'main.commit=$COMMIT' \
+    " -o app cmd/updater/main.go
+
 FROM scratch
-ARG BUILD_DATE
-ARG VCS_REF
-ARG VERSION
-ENV VERSION=$VERSION \
-    BUILD_DATE=$BUILD_DATE \
-    VCS_REF=$VCS_REF
+ARG VERSION=unknown
+ARG BUILD_DATE="an unknown date"
+ARG COMMIT=unknown
 LABEL \
     org.opencontainers.image.authors="quentin.mcgaw@gmail.com" \
-    org.opencontainers.image.created=$BUILD_DATE \
     org.opencontainers.image.version=$VERSION \
-    org.opencontainers.image.revision=$VCS_REF \
+    org.opencontainers.image.created=$BUILD_DATE \
+    org.opencontainers.image.revision=$COMMIT \
     org.opencontainers.image.url="https://github.com/qdm12/ddns-updater" \
     org.opencontainers.image.documentation="https://github.com/qdm12/ddns-updater" \
     org.opencontainers.image.source="https://github.com/qdm12/ddns-updater" \
     org.opencontainers.image.title="ddns-updater" \
-    org.opencontainers.image.description="Universal DNS updater with WebUI. Works with Cloudflare, DDNSS.de, DNSPod, Dreamhost, DuckDNS, DynDNS, GoDaddy, Google, He.net, Infomaniak, Namecheap and NoIP"
+    org.opencontainers.image.description="Universal DNS updater with WebUI"
 COPY --from=alpine --chown=1000 /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=alpine --chown=1000 /usr/share/zoneinfo /usr/share/zoneinfo
 EXPOSE 8000
@@ -46,9 +78,10 @@ ENV \
     # Core
     CONFIG= \
     PERIOD=5m \
-    IP_METHOD=cycle \
-    IPV4_METHOD=cycle \
-    IPV6_METHOD=cycle \
+    UPDATE_COOLDOWN_PERIOD=5m \
+    IP_METHOD=all \
+    IPV4_METHOD=all \
+    IPV6_METHOD=all \
     HTTP_TIMEOUT=10s \
 
     # Web UI
@@ -60,11 +93,11 @@ ENV \
     BACKUP_DIRECTORY=/updater/data \
 
     # Other
-    LOG_ENCODING=console \
     LOG_LEVEL=info \
-    NODE_ID=-1 \
+    LOG_CALLER=hidden \
     GOTIFY_URL= \
     GOTIFY_TOKEN= \
     TZ=
-COPY --from=builder --chown=1000 /tmp/gobuild/app /updater/app
+COPY --from=alpine --chown=1000 /tmp/data /updater/data/
+COPY --from=build --chown=1000 /tmp/gobuild/app /updater/app
 COPY --chown=1000 ui/* /updater/ui/

README.md

@@ -1,8 +1,8 @@
 # Lightweight universal DDNS Updater with Docker and web UI
 
-*Light container updating DNS A records periodically for Cloudflare, DDNSS.de, DonDominio, DNSPod, Dreamhost, DuckDNS, DynDNS, GoDaddy, Google, He.net, Infomaniak, Namecheap and NoIP*
+*Light container updating DNS A and/or AAAA records periodically for multiple DNS providers*
 
-[![DDNS Updater by Quentin McGaw](https://github.com/qdm12/ddns-updater/raw/master/readme/title.png)](https://hub.docker.com/r/qmcgaw/ddns-updater)
+<img height="200" alt="DDNS Updater logo" src="https://raw.githubusercontent.com/qdm12/ddns-updater/master/readme/ddnsgopher.svg?sanitize=true">
 
 [![Build status](https://github.com/qdm12/ddns-updater/workflows/Buildx%20latest/badge.svg)](https://github.com/qdm12/ddns-updater/actions?query=workflow%3A%22Buildx+latest%22)
 [![Docker Pulls](https://img.shields.io/docker/pulls/qmcgaw/ddns-updater.svg)](https://hub.docker.com/r/qmcgaw/ddns-updater)
@@ -17,7 +17,31 @@
 
 ## Features
 
-- Updates periodically A records for different DNS providers: Cloudflare, DDNSS.de, DonDominio, DNSPod, Dreamhost, DuckDNS, DynDNS, GoDaddy, Google, He.net, Infomaniak, Namecheap and NoIP ([create an issue](https://github.com/qdm12/ddns-updater/issues/new/choose) for more)
+- Updates periodically A records for different DNS providers:
+    - Cloudflare
+    - DDNSS.de
+    - DigitalOcean
+    - DonDominio
+    - DNSOMatic
+    - DNSPod
+    - Dreamhost
+    - DuckDNS
+    - DynDNS
+    - FreeDNS
+    - Gandi
+    - GoDaddy
+    - Google
+    - He.net
+    - Infomaniak
+    - Linode
+    - LuaDNS
+    - Namecheap
+    - NoIP
+    - OpenDNS
+    - OVH
+    - Selfhost.de
+    - Strato.de
+    - **Want more?** [Create an issue for it](https://github.com/qdm12/ddns-updater/issues/new/choose)!
 - Web User interface
 
 ![Web UI](https://raw.githubusercontent.com/qdm12/ddns-updater/master/readme/webui.png)
@@ -31,51 +55,7 @@
 
 ## Setup
 
-The program reads the configuration from a JSON configuration file.
-
-1. First, create a JSON configuration starting from, for example:
-
-    ```json
-    {
-        "settings": [
-            {
-                "provider": "namecheap",
-                "domain": "example.com",
-                "host": "@",
-                "password": "e5322165c1d74692bfa6d807100c0310"
-            },
-            {
-                "provider": "duckdns",
-                "domain": "example.duckdns.org",
-                "token": "00000000-0000-0000-0000-000000000000"
-            },
-            {
-                "provider": "godaddy",
-                "domain": "example.org",
-                "host": "subdomain",
-                "key": "aaaaaaaaaaaaaaaa",
-                "secret": "aaaaaaaaaaaaaaaa"
-            }
-        ]
-    }
-    ```
-
-1. You can find more information in the [configuration section](#configuration) to customize it.
-1. You can either use a bind mounted file or put all your JSON in a single line with the `CONFIG` environment variable, see the two subsections below for each
-
-### Using the CONFIG variable
-
-1. Remove all 'new lines' in order to put your entire JSON in a single line (i.e. `{"settings": [{"provider": "namecheap", ...}]}`)
-1. Set the `CONFIG` environment variable to your single line configuration
-1. Use the following command:
-
-    ```sh
-    docker run -d -p 8000:8000/tcp -e CONFIG='{"settings": [{"provider": "namecheap", ...}]}' qmcgaw/ddns-updater
-    ```
-
-Note that this CONFIG environment variable takes precedence over the config.json file if it is set.
-
-### Using a file
+The program reads the configuration from a JSON object, either from a file or from an environment variable.
 
 1. Create a directory of your choice, say *data* with a file named **config.json** inside:
 
@@ -92,13 +72,31 @@ Note that this CONFIG environment variable takes precedence over the config.json
 
     *(You could change the user ID, for example with `1001`, by running the container with `--user=1001`)*
 
-1. Place your JSON configuration in `data/config.json`
-1. Use the following command:
+1. Write a JSON configuration in *data/config.json*, for example:
+
+    ```json
+    {
+        "settings": [
+            {
+                "provider": "namecheap",
+                "domain": "example.com",
+                "host": "@",
+                "password": "e5322165c1d74692bfa6d807100c0310"
+            }
+        ]
+    }
+    ```
+
+    You can find more information in the [configuration section](#configuration) to customize it.
+
+1. Run the container with
 
     ```sh
     docker run -d -p 8000:8000/tcp -v "$(pwd)"/data:/updater/data qmcgaw/ddns-updater
     ```
 
+1. (Optional) You can also set your JSON configuration as a single environment variable line (i.e. `{"settings": [{"provider": "namecheap", ...}]}`), which takes precedence over config.json. Note however that if you don't bind mount the `/updater/data` directory, there won't be a persistent database file `/updater/updates.json` but it will still work.
+
 ### Next steps
 
 You can also use [docker-compose.yml](https://github.com/qdm12/ddns-updater/blob/master/docker-compose.yml) with:
@@ -126,120 +124,37 @@ Start by having the following content in *config.json*, or in your `CONFIG` envi
 }
 ```
 
-The following parameters are to be added:
+For each setting, you need to fill in parameters.
+Check the documentation for your DNS provider:
 
-For all record update configuration, you have to specify the DNS provider with `"provider"` which can be `"cloudflare"`, `"ddnss"`, `"dondominio"`, `"dnspod"`, `"dreamhost"`, `"duckdns"`, `"dyn"`, `"godaddy"`, `"google"`, `"he"`, `"infomaniak"`, `"namecheap"` or `"noip"`.
-You can optionnally add the parameters:
+- [Cloudflare](https://github.com/qdm12/ddns-updater/blob/master/docs/cloudflare.md)
+- [DDNSS.de](https://github.com/qdm12/ddns-updater/blob/master/docs/ddnss.de.md)
+- [DigitalOcean](https://github.com/qdm12/ddns-updater/blob/master/docs/digitalocean.md)
+- [DonDominio](https://github.com/qdm12/ddns-updater/blob/master/docs/dondominio.md)
+- [DNSOMatic](https://github.com/qdm12/ddns-updater/blob/master/docs/dnsomatic.md)
+- [DNSPod](https://github.com/qdm12/ddns-updater/blob/master/docs/dnspod.md)
+- [Dreamhost](https://github.com/qdm12/ddns-updater/blob/master/docs/dreamhost.md)
+- [DuckDNS](https://github.com/qdm12/ddns-updater/blob/master/docs/duckdns.md)
+- [DynDNS](https://github.com/qdm12/ddns-updater/blob/master/docs/dyndns.md)
+- [DynV6](https://github.com/qdm12/ddns-updater/blob/master/docs/dynv6.md)
+- [FreeDNS](https://github.com/qdm12/ddns-updater/blob/master/docs/freedns.md)
+- [Gandi](https://github.com/qdm12/ddns-updater/blob/master/docs/gandi.md)
+- [GoDaddy](https://github.com/qdm12/ddns-updater/blob/master/docs/godaddy.md)
+- [Google](https://github.com/qdm12/ddns-updater/blob/master/docs/google.md)
+- [He.net](https://github.com/qdm12/ddns-updater/blob/master/docs/he.net.md)
+- [Infomaniak](https://github.com/qdm12/ddns-updater/blob/master/docs/infomaniak.md)
+- [Linode](https://github.com/qdm12/ddns-updater/blob/master/docs/linode.md)
+- [LuaDNS](https://github.com/qdm12/ddns-updater/blob/master/docs/luadns.md)
+- [Namecheap](https://github.com/qdm12/ddns-updater/blob/master/docs/namecheap.md)
+- [NoIP](https://github.com/qdm12/ddns-updater/blob/master/docs/noip.md)
+- [OpenDNS](https://github.com/qdm12/ddns-updater/blob/master/docs/opendns.md)
+- [OVH](https://github.com/qdm12/ddns-updater/blob/master/docs/ovh.md)
+- [Selfhost.de](https://github.com/qdm12/ddns-updater/blob/master/docs/selfhost.de.md)
+- [Strato.de](https://github.com/qdm12/ddns-updater/blob/master/docs/strato.md)
 
-- `"no_dns_lookup"` can be `true` or `false` and allows, if `true`, to prevent the program from doing assumptions from DNS lookups returning an IP address not matching your public IP address (in example for proxied records on Cloudflare).
-- `"provider_ip"` can be `true` or `false`. It is only available for the providers `ddnss`, `duckdns`, `he`, `infomaniak`, `namecheap`, `noip` and `dyndns`. It allows to let your DNS provider to determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+Note that:
 
-For each DNS provider exist some specific parameters you need to add, as described below:
-
-Namecheap:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain, `"@"` or `"*"` generally
-- `"password"`
-
-Cloudflare:
-
-- `"zone_identifier"` is the Zone ID of your site
-- `"domain"`
-- `"host"` is your host and can be a subdomain, `"@"` or `"*"` generally
-- `"ttl"` integer value for record TTL in seconds (specify 1 for automatic)
-- One of the following:
-    - Email `"email"` and Global API Key `"key"`
-    - User service key `"user_service_key"`
-    - API Token `"token"`, configured with DNS edit permissions for your DNS name's zone.
-- *Optionally*, `"proxied"` can be `true` or `false` to use the proxy services of Cloudflare
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-GoDaddy:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain, `"@"` or `"*"` generally
-- `"key"`
-- `"secret"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-DuckDNS:
-
-- `"domain"` is your fqdn, for example `subdomain.duckdns.org`
-- `"token"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-Dreamhost:
-
-- `"domain"`
-- `"key"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-NoIP:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"`
-- `"username"`
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-DNSPOD:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"`
-- `"token"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-HE.net:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"` or `"*"` (untested)
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-Infomaniak:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"`
-- `"user"`
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-DDNSS.de:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"`
-- `"user"`
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-DYNDNS:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"`
-- `"username"`
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-Google:
-
-- `"domain"`
-- `"host"` is your host and can be a subdomain or `"@"` or `"*"`
-- `"username"`
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-
-DonDominio:
-
-- `"domain"`
-- `"username"`
-- `"password"`
-- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
-- `"name"` is the name server associated with the domain
-
-### Additional notes
-
-- You can specify multiple hosts for the same domain using a comma separated list. For example with `"host": "@,subdomain1,subdomain2",`.
+- you can specify multiple hosts for the same domain using a comma separated list. For example with `"host": "@,subdomain1,subdomain2",`.
 
 ### Environment variables
 
@@ -247,44 +162,40 @@ DonDominio:
 | --- | --- | --- |
 | `CONFIG` | | One line JSON object containing the entire config (takes precendence over config.json file) if specified |
 | `PERIOD` | `5m` | Default period of IP address check, following [this format](https://golang.org/pkg/time/#ParseDuration) |
-| `IP_METHOD` | `cycle` | Method to obtain the public IP address (ipv4 or ipv6). See the [IP Methods section](#IP-methods) |
-| `IPV4_METHOD` | `cycle` | Method to obtain the public IPv4 address only. See the [IP Methods section](#IP-methods) |
-| `IPV6_METHOD` | `cycle` | Method to obtain the public IPv6 address only. See the [IP Methods section](#IP-methods) |
+| `IP_METHOD` | `all` | Comma separated methods to obtain the public IP address (ipv4 or ipv6). See the [IP Methods section](#IP-methods) |
+| `IPV4_METHOD` | `all` | Comma separated methods to obtain the public IPv4 address only. See the [IP Methods section](#IP-methods) |
+| `IPV6_METHOD` | `all` | Comma separated methods to obtain the public IPv6 address only. See the [IP Methods section](#IP-methods) |
+| `UPDATE_COOLDOWN_PERIOD` | `5m` | Duration to cooldown between updates for each record. This is useful to avoid being rate limited or banned. |
 | `HTTP_TIMEOUT` | `10s` | Timeout for all HTTP requests |
 | `LISTENING_PORT` | `8000` | Internal TCP listening port for the web UI |
 | `ROOT_URL` | `/` | URL path to append to all paths to the webUI (i.e. `/ddns` for accessing `https://example.com/ddns` through a proxy) |
 | `BACKUP_PERIOD` | `0` | Set to a period (i.e. `72h15m`) to enable zip backups of data/config.json and data/updates.json in a zip file |
-| `BACKUP_DIRECTORY` | `/updater/data` | Directory to write backup zip files to if `BACKUP_PERIOD` is not `0`.
-| `LOG_ENCODING` | `console` | Format of logging, `json` or `console` |
+| `BACKUP_DIRECTORY` | `/updater/data` | Directory to write backup zip files to if `BACKUP_PERIOD` is not `0`. |
 | `LOG_LEVEL` | `info` | Level of logging, `info`, `warning` or `error` |
-| `NODE_ID` | `-1` | Node ID (for distributed systems), can be any integer |
+| `LOG_CALLER` | `hidden` | Show caller per log line, `hidden` or `short` |
 | `GOTIFY_URL` |  | (optional) HTTP(s) URL to your Gotify server |
 | `GOTIFY_TOKEN` |  | (optional) Token to access your Gotify server |
 | `TZ` | | Timezone to have accurate times, i.e. `America/Montreal` |
 
 #### IP methods
 
-By default, all ip methods are cycled through between all ip methods available for the specified ip version, if any. This allows you not to be blocked for making too many requests. You can otherwise pick one of the following.
+By default, all ip methods are specified. The program will cycle between each. This allows you not to be blocked for making too many requests. You can otherwise pick one or more of the following, for each ip version:
 
 - IPv4 or IPv6 (for most cases)
   - `opendns` using [https://diagnostic.opendns.com/myip](https://diagnostic.opendns.com/myip)
   - `ifconfig` using [https://ifconfig.io/ip](https://ifconfig.io/ip)
   - `ipinfo` using [https://ipinfo.io/ip](https://ipinfo.io/ip)
   - `ipify` using [https://api.ipify.org](https://api.ipify.org)
-  - `"ddnss"` using [https://ddnss.de/meineip.php](https://ddnss.de/meineip.php)
-  - `"google"` using [https://domains.google.com/checkip](https://domains.google.com/checkip)
+  - `ddnss` using [https://ddnss.de/meineip.php](https://ddnss.de/meineip.php)
+  - `google` using [https://domains.google.com/checkip](https://domains.google.com/checkip)
 - IPv4 only (useful for updating both ipv4 and ipv6)
   - `ipify` using [https://api.ipify.org](https://api.ipify.org)
-  - `"ddnss4"` using [https://ip4.ddnss.de/meineip.php](https://ip4.ddnss.de/meineip.php)
-  - `"noip4"` using [http://ip1.dynupdate.no-ip.com](http://ip1.dynupdate.no-ip.com)
-  - `"noip8245_4"` using [http://ip1.dynupdate.no-ip.com:8245](http://ip1.dynupdate.no-ip.com:8245)
+  - `noip` using [http://ip1.dynupdate.no-ip.com](http://ip1.dynupdate.no-ip.com)
 - IPv6 only
-  - `ipify6` using [https://api6.ipify.org](https://api6.ipify.org)
-  - `"ddnss6"` using [https://ip6.ddnss.de/meineip.php](https://ip6.ddnss.de/meineip.php)
-  - `"noip6"` using [http://ip1.dynupdate.no-ip.com](http://ip1.dynupdate.no-ip.com)
-  - `"noip8245_6"` using [http://ip1.dynupdate.no-ip.com:8245](http://ip1.dynupdate.no-ip.com:8245)
+  - `ipify` using [https://api6.ipify.org](https://api6.ipify.org)
+  - `noip` using [http://ip1.dynupdate6.no-ip.com](http://ip1.dynupdate6.no-ip.com)
 
-You can also specify an HTTPS URL to obtain your public IP address (i.e. `-e IPV6_METHOD=https://ipinfo.io/ip`)
+You can also specify one or more HTTPS URL to obtain your public IP address (i.e. `-e IPV6_METHOD=https://ipinfo.io/ip`).
 
 ### Host firewall
 
@@ -295,9 +206,39 @@ If you have a host firewall in place, this container needs the following ports:
 - UDP 53 outbound for outbound DNS resolution
 - TCP 8000 inbound (or other) for the WebUI
 
-## Domain set up
+## Architecture
 
-Instructions to setup your domain for this program are available for DuckDNS, Cloudflare, GoDaddy and Namecheap on the [Github Wiki](https://github.com/qdm12/ddns-updater/wiki).
+At program start and every period (5 minutes by default):
+
+1. Fetch your public IP address
+1. For each record:
+    1. DNS resolve it to obtain its current IP address(es)
+        - If the resolution fails, update the record with your public IP address by calling the DNS provider API and finish
+    1. Check if your public IP address is within the resolved IP addresses
+        - Yes: skip the update
+        - No: update the record with your public IP address by calling the DNS provider API
+
+💡 We do DNS resolution every period so it detects a change made to the record manually, for example on the DNS provider web UI
+💡 As DNS resolutions are essentially free and without rate limiting, these are great to avoid getting banned for too many requests.
+
+### Special case: Cloudflare
+
+For Cloudflare records with the `proxied` option, the following is done.
+
+At program start and every period (5 minutes by default), for each record:
+
+1. Fetch your public IP address
+1. For each record:
+    1. Check the last IP address (persisted in `updates.json`) for that record
+        - If it doesn't exist, update the record with your public IP address by calling the DNS provider API and finish
+    1. Check if your public IP address matches the last IP address you updated the record with
+        - Yes: skip the update
+        - No: update the record with your public IP address by calling the DNS provider API
+
+This is the only way as doing a DNS resolution on the record will give the IP address of a Cloudflare server instead of your server.
+
+⚠️ This has the disadvantage that if the record is changed manually, the program will not detect it.
+We could do an API call to get the record IP address every period, but that would get you banned especially with a low period duration.
 
 ## Gotify
 
@@ -326,11 +267,9 @@ To set it up with DDNS updater:
     1. Run the container
     1. Refresh the DNS management webpage and verify the update happened
 
-    Better testing instructions are written in the [Wiki for GoDaddy](https://github.com/qdm12/ddns-updater/wiki/GoDaddy#testing)
-
 ## Development and contributing
 
-- Contribute with code: see [the Wiki](https://github.com/qdm12/ddns-updater/wiki/Contributing)
+- [Contribute with code](https://github.com/qdm12/ddns-updater/blob/master/docs/contributing.md)
 - [Github workflows to know what's building](https://github.com/qdm12/ddns-updater/actions)
 - [List of issues and feature requests](https://github.com/qdm12/ddns-updater/issues)
 - [Kanban board](https://github.com/qdm12/ddns-updater/projects/1)

cmd/updater/main.go

@@ -2,74 +2,82 @@ package main
 
 import (
 	"context"
-	"net"
-	"os/signal"
-	"syscall"
-
 	"fmt"
+	"net"
 	"net/http"
 	"os"
+	"os/signal"
+	"path/filepath"
+	"sync"
+	"syscall"
 	"time"
 
 	"github.com/qdm12/ddns-updater/internal/backup"
 	"github.com/qdm12/ddns-updater/internal/data"
-	"github.com/qdm12/ddns-updater/internal/handlers"
-	"github.com/qdm12/ddns-updater/internal/healthcheck"
+	"github.com/qdm12/ddns-updater/internal/health"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/params"
 	"github.com/qdm12/ddns-updater/internal/persistence"
 	recordslib "github.com/qdm12/ddns-updater/internal/records"
+	"github.com/qdm12/ddns-updater/internal/server"
 	"github.com/qdm12/ddns-updater/internal/splash"
 	"github.com/qdm12/ddns-updater/internal/update"
+	pubiphttp "github.com/qdm12/ddns-updater/pkg/publicip/http"
 	"github.com/qdm12/golibs/admin"
-	libhealthcheck "github.com/qdm12/golibs/healthcheck"
 	"github.com/qdm12/golibs/logging"
-	"github.com/qdm12/golibs/network"
 	"github.com/qdm12/golibs/network/connectivity"
-	"github.com/qdm12/golibs/server"
+)
+
+var (
+	buildInfo models.BuildInformation
+	version   = "unknown"
+	commit    = "unknown"
+	buildDate = "an unknown date"
 )
 
 func main() {
+	buildInfo.Version = version
+	buildInfo.Commit = commit
+	buildInfo.BuildDate = buildDate
 	os.Exit(_main(context.Background(), time.Now))
-	// returns 1 on error
-	// returns 2 on os signal
 }
 
 type allParams struct {
 	period          time.Duration
-	ipMethod        models.IPMethod
-	ipv4Method      models.IPMethod
-	ipv6Method      models.IPMethod
+	cooldown        time.Duration
+	httpIPOptions   []pubiphttp.Option
 	dir             string
 	dataDir         string
-	listeningPort   string
+	listeningPort   uint16
 	rootURL         string
 	backupPeriod    time.Duration
 	backupDirectory string
 }
 
 func _main(ctx context.Context, timeNow func() time.Time) int {
-	if libhealthcheck.Mode(os.Args) {
+	if health.IsClientMode(os.Args) {
 		// Running the program in a separate instance through the Docker
 		// built-in healthcheck, in an ephemeral fashion to query the
 		// long running instance of the program about its status
-		if err := libhealthcheck.Query(); err != nil {
+		client := health.NewClient()
+		if err := client.Query(ctx); err != nil {
 			fmt.Println(err)
 			return 1
 		}
 		return 0
 	}
-	logger, err := setupLogger()
+
+	fmt.Println(splash.Splash(buildInfo))
+
+	// Setup logger
+	paramsReader := params.NewReader(logging.New(logging.StdLog)) // use a temporary logger
+	logLevel, logCaller, err := paramsReader.LoggerConfig()
 	if err != nil {
 		fmt.Println(err)
 		return 1
 	}
-	paramsReader := params.NewReader(logger)
-
-	fmt.Println(splash.Splash(
-		paramsReader.GetVersion(),
-		paramsReader.GetVcsRef(),
-		paramsReader.GetBuildDate()))
+	logger := logging.New(logging.StdLog, logging.SetLevel(logLevel), logging.SetCaller(logCaller))
+	paramsReader = params.NewReader(logger)
 
 	notify, err := setupGotify(paramsReader, logger)
 	if err != nil {
@@ -90,7 +98,7 @@ func _main(ctx context.Context, timeNow func() time.Time) int {
 		notify(4, err)
 		return 1
 	}
-	settings, warnings, err := paramsReader.GetSettings(p.dataDir + "/config.json")
+	settings, warnings, err := paramsReader.JSONSettings(filepath.Join(p.dataDir, "config.json"))
 	for _, w := range warnings {
 		logger.Warn(w)
 		notify(2, w)
@@ -105,7 +113,9 @@ func _main(ctx context.Context, timeNow func() time.Time) int {
 	} else if len(settings) == 1 {
 		logger.Info("Found single setting to update record")
 	}
-	for _, err := range connectivity.NewConnectivity(5 * time.Second).Checks("google.com") {
+	const connectivyCheckTimeout = 5 * time.Second
+	for _, err := range connectivity.NewConnectivity(connectivyCheckTimeout).
+		Checks(ctx, "google.com") {
 		logger.Warn(err)
 	}
 	records := make([]recordslib.Record, len(settings))
@@ -119,42 +129,58 @@ func _main(ctx context.Context, timeNow func() time.Time) int {
 		}
 		records[i] = recordslib.New(s, events)
 	}
-	HTTPTimeout, err := paramsReader.GetHTTPTimeout()
+	HTTPTimeout, err := paramsReader.HTTPTimeout()
 	if err != nil {
 		logger.Error(err)
 		notify(4, err)
 		return 1
 	}
-	client := network.NewClient(HTTPTimeout)
-	defer client.Close()
+	client := &http.Client{Timeout: HTTPTimeout}
+	defer client.CloseIdleConnections()
 	db := data.NewDatabase(records, persistentDB)
 	defer func() {
 		if err := db.Close(); err != nil {
 			logger.Error(err)
 		}
 	}()
-	updater := update.NewUpdater(db, client, notify)
-	ipGetter := update.NewIPGetter(client, p.ipMethod, p.ipv4Method, p.ipv6Method)
-	runner := update.NewRunner(db, updater, ipGetter, logger, timeNow)
+
+	wg := &sync.WaitGroup{}
+	defer wg.Wait()
+
+	ipGetter, err := pubiphttp.New(client, p.httpIPOptions...)
+	if err != nil {
+		logger.Error(err)
+		return 1
+	}
+
+	updater := update.NewUpdater(db, client, notify, logger)
+	runner := update.NewRunner(db, updater, ipGetter, p.cooldown, logger, timeNow)
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
-	forceUpdate := runner.Run(ctx, p.period)
-	forceUpdate()
-	productionHandlerFunc := handlers.MakeHandler(p.rootURL, p.dir+"/ui", db, logger, forceUpdate, timeNow)
-	healthcheckHandlerFunc := libhealthcheck.GetHandler(func() error {
-		return healthcheck.IsHealthy(db, net.LookupIP, logger)
-	})
-	logger.Info("Web UI listening at address 0.0.0.0:%s with root URL %q", p.listeningPort, p.rootURL)
-	notify(1, fmt.Sprintf("Launched with %d records to watch", len(records)))
-	serverErrors := make(chan []error)
-	go func() {
-		serverErrors <- server.RunServers(ctx,
-			server.Settings{Name: "production", Addr: "0.0.0.0:" + p.listeningPort, Handler: productionHandlerFunc},
-			server.Settings{Name: "healthcheck", Addr: "127.0.0.1:9999", Handler: healthcheckHandlerFunc},
-		)
-	}()
 
-	go backupRunLoop(ctx, p.backupPeriod, p.dir, p.backupDirectory, logger, timeNow)
+	go runner.Run(ctx, p.period)
+
+	// note: errors are logged within the goroutine,
+	// no need to collect the resulting errors.
+	go runner.ForceUpdate(ctx)
+
+	const healthServerAddr = "127.0.0.1:9999"
+	isHealthy := health.MakeIsHealthy(db, net.LookupIP, logger)
+	healthServer := health.NewServer(healthServerAddr,
+		logger.NewChild(logging.SetPrefix("healthcheck server: ")),
+		isHealthy)
+	wg.Add(1)
+	go healthServer.Run(ctx, wg)
+
+	address := fmt.Sprintf("0.0.0.0:%d", p.listeningPort)
+	uiDir := p.dir + "/ui"
+	server := server.New(ctx, address, p.rootURL, uiDir, db, logger.NewChild(logging.SetPrefix("http server: ")), runner)
+	wg.Add(1)
+	go server.Run(ctx, wg)
+	notify(1, fmt.Sprintf("Launched with %d records to watch", len(records)))
+
+	go backupRunLoop(ctx, p.backupPeriod, p.dir, p.backupDirectory,
+		logger.NewChild(logging.SetPrefix("backup: ")), timeNow)
 
 	osSignals := make(chan os.Signal, 1)
 	signal.Notify(osSignals,
@@ -163,16 +189,11 @@ func _main(ctx context.Context, timeNow func() time.Time) int {
 		os.Interrupt,
 	)
 	select {
-	case errors := <-serverErrors:
-		for _, err := range errors {
-			logger.Error(err)
-		}
-		return 1
 	case signal := <-osSignals:
 		message := fmt.Sprintf("Stopping program: caught OS signal %q", signal)
 		logger.Warn(message)
 		notify(2, message)
-		return 2
+		return 1
 	case <-ctx.Done():
 		message := fmt.Sprintf("Stopping program: %s", ctx.Err())
 		logger.Warn(message)
@@ -180,23 +201,15 @@ func _main(ctx context.Context, timeNow func() time.Time) int {
 	}
 }
 
-func setupLogger() (logging.Logger, error) {
-	paramsReader := params.NewReader(nil)
-	encoding, level, nodeID, err := paramsReader.GetLoggerConfig()
-	if err != nil {
-		return nil, err
-	}
-	return logging.NewLogger(encoding, level, nodeID)
-}
-
-func setupGotify(paramsReader params.Reader, logger logging.Logger) (notify func(priority int, messageArgs ...interface{}), err error) {
-	gotifyURL, err := paramsReader.GetGotifyURL()
+func setupGotify(paramsReader params.Reader, logger logging.Logger) (
+	notify func(priority int, messageArgs ...interface{}), err error) {
+	gotifyURL, err := paramsReader.GotifyURL()
 	if err != nil {
 		return nil, err
 	} else if gotifyURL == nil {
 		return func(priority int, messageArgs ...interface{}) {}, nil
 	}
-	gotifyToken, err := paramsReader.GetGotifyToken()
+	gotifyToken, err := paramsReader.GotifyToken()
 	if err != nil {
 		return nil, err
 	}
@@ -210,46 +223,57 @@ func setupGotify(paramsReader params.Reader, logger logging.Logger) (notify func
 
 func getParams(paramsReader params.Reader, logger logging.Logger) (p allParams, err error) {
 	var warnings []string
-	p.period, warnings, err = paramsReader.GetPeriod()
+	p.period, warnings, err = paramsReader.Period()
 	for _, warning := range warnings {
 		logger.Warn(warning)
 	}
 	if err != nil {
 		return p, err
 	}
-	p.ipMethod, err = paramsReader.GetIPMethod()
+	p.cooldown, err = paramsReader.CooldownPeriod()
 	if err != nil {
 		return p, err
 	}
-	p.ipv4Method, err = paramsReader.GetIPv4Method()
+
+	httpIPProviders, err := paramsReader.IPMethod()
 	if err != nil {
 		return p, err
 	}
-	p.ipv6Method, err = paramsReader.GetIPv6Method()
+	httpIP4Providers, err := paramsReader.IPv4Method()
 	if err != nil {
 		return p, err
 	}
-	p.dir, err = paramsReader.GetExeDir()
+	httpIP6Providers, err := paramsReader.IPv6Method()
 	if err != nil {
 		return p, err
 	}
-	p.dataDir, err = paramsReader.GetDataDir(p.dir)
+	p.httpIPOptions = []pubiphttp.Option{
+		pubiphttp.SetProvidersIP(httpIPProviders[0], httpIPProviders[1:]...),
+		pubiphttp.SetProvidersIP4(httpIP4Providers[0], httpIP4Providers[1:]...),
+		pubiphttp.SetProvidersIP6(httpIP6Providers[0], httpIP6Providers[1:]...),
+	}
+
+	p.dir, err = paramsReader.ExeDir()
 	if err != nil {
 		return p, err
 	}
-	p.listeningPort, _, err = paramsReader.GetListeningPort()
+	p.dataDir, err = paramsReader.DataDir(p.dir)
 	if err != nil {
 		return p, err
 	}
-	p.rootURL, err = paramsReader.GetRootURL()
+	p.listeningPort, _, err = paramsReader.ListeningPort()
 	if err != nil {
 		return p, err
 	}
-	p.backupPeriod, err = paramsReader.GetBackupPeriod()
+	p.rootURL, err = paramsReader.RootURL()
 	if err != nil {
 		return p, err
 	}
-	p.backupDirectory, err = paramsReader.GetBackupDirectory()
+	p.backupPeriod, err = paramsReader.BackupPeriod()
+	if err != nil {
+		return p, err
+	}
+	p.backupDirectory, err = paramsReader.BackupDirectory()
 	if err != nil {
 		return p, err
 	}
@@ -258,7 +282,6 @@ func getParams(paramsReader params.Reader, logger logging.Logger) (p allParams,
 
 func backupRunLoop(ctx context.Context, backupPeriod time.Duration, exeDir, outputDir string,
 	logger logging.Logger, timeNow func() time.Time) {
-	logger = logger.WithPrefix("backup: ")
 	if backupPeriod == 0 {
 		logger.Info("disabled")
 		return

docker-compose.yml

@@ -11,9 +11,10 @@ services:
     environment:
       - CONFIG=
       - PERIOD=5m
-      - IP_METHOD=cycle
-      - IPV4_METHOD=cycle
-      - IPV6_METHOD=cycle
+      - UPDATE_COOLDOWN_PERIOD=5m
+      - IP_METHOD=all
+      - IPV4_METHOD=all
+      - IPV6_METHOD=all
       - HTTP_TIMEOUT=10s
 
       # Web UI
@@ -25,9 +26,8 @@ services:
       - BACKUP_DIRECTORY=/updater/data
 
       # Other
-      - LOG_ENCODING=console
       - LOG_LEVEL=info
-      - NODE_ID=-1 # -1 to disable
+      - LOG_CALLER=hidden
       - GOTIFY_URL=
       - GOTIFY_TOKEN=
     restart: always

docs/cloudflare.md

@@ -0,0 +1,57 @@
+# Cloudflare
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "cloudflare",
+      "zone_identifier": "some id",
+      "domain": "domain.com",
+      "host": "@",
+      "ttl": 600,
+      "token": "yourtoken",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"zone_identifier"` is the Zone ID of your site
+- `"domain"`
+- `"host"` is your host and can be a subdomain, `"@"` or `"*"` generally
+- `"ttl"` integer value for record TTL in seconds (specify 1 for automatic)
+- One of the following:
+    - Email `"email"` and Global API Key `"key"`
+    - User service key `"user_service_key"`
+    - API Token `"token"`, configured with DNS edit permissions for your DNS name's zone
+
+### Optional parameters
+
+- `"proxied"` can be set to `true` to use the proxy services of Cloudflare
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), and defaults to `ipv4 or ipv6`
+
+## Domain setup
+
+1. Make sure you have `curl` installed
+1. Obtain your API key from Cloudflare website ([see this](https://support.cloudflare.com/hc/en-us/articles/200167836-Where-do-I-find-my-Cloudflare-API-key-))
+1. Obtain your zone identifier for your domain name, from the domain's overview page written as *Zone ID*
+1. Find your **identifier** in the `id` field with
+
+    ```sh
+    ZONEID=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    EMAIL=example@example.com
+    APIKEY=aaaaaaaaaaaaaaaaaa
+    curl -X GET "https://api.cloudflare.com/client/v4/zones/$ZONEID/dns_records" \
+        -H "X-Auth-Email: $EMAIL" \
+        -H "X-Auth-Key: $APIKEY"
+    ```
+
+You can now fill in the necessary parameters in *config.json*
+
+Special thanks to @Starttoaster for helping out with the [documentation](https://gist.github.com/Starttoaster/07d568c2a99ad7631dd776688c988326) and testing.

docs/contributing.md

@@ -0,0 +1,52 @@
+# Contributing
+
+## Table of content
+
+1. [Setup](#Setup)
+1. [Commands available](#Commands-available)
+1. [Guidelines](#Guidelines)
+
+## Setup
+
+### Using VSCode and Docker
+
+That should be easier and better than a local setup, although it might use more memory if you're not on Linux.
+
+1. Install [Docker](https://docs.docker.com/install/)
+    - On Windows, share a drive with Docker Desktop and have the project on that partition
+    - On OSX, share your project directory with Docker Desktop
+1. With [Visual Studio Code](https://code.visualstudio.com/download), install the [remote containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
+1. In Visual Studio Code, press on `F1` and select `Remote-Containers: Open Folder in Container...`
+1. Your dev environment is ready to go!... and it's running in a container :+1:
+
+### Locally
+
+Install [Go](https://golang.org/dl/), [Docker](https://www.docker.com/products/docker-desktop) and [Git](https://git-scm.com/downloads); then:
+
+```sh
+go mod download
+```
+
+And finally install [golangci-lint](https://github.com/golangci/golangci-lint#install).
+
+You might want to use an editor such as [Visual Studio Code](https://code.visualstudio.com/download) with the [Go extension](https://code.visualstudio.com/docs/languages/go). Working settings are already in [.vscode/settings.json](../.vscode/settings.json).
+
+## Build and Run
+
+```sh
+go build -o app cmd/updater/main.go
+./app
+```
+
+## Commands available
+
+- Test the code: `go test ./...`
+- Lint the code `golangci-lint run`
+- Build the Docker image (tests and lint included): `docker build -t qmcgaw/ddns-updater .`
+- Run the Docker container: `docker run -it --rm -v /yourpath/data:/updater/data qmcgaw/ddns-updater`
+
+## Guidelines
+
+The Go code is in the Go file [cmd/updater/main.go](](../cmd/updater/main.go) and the [internal directory](](../internal), you might want to start reading the main.go file.
+
+See the [Contributing document](](../.github/CONTRIBUTING.md) for more information on how to contribute to this repository.

docs/ddnss.de.md

@@ -0,0 +1,34 @@
+# DDNSS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "ddnss",
+      "provider_ip": true,
+      "domain": "domain.com",
+      "host": "@",
+      "username": "user",
+      "password": "password",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/digitalocean.md

@@ -0,0 +1,31 @@
+# Digital Ocean
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "digitalocean",
+      "domain": "domain.com",
+      "host": "@",
+      "token": "yourtoken",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"` or `"*"`
+- `"token"` is your token that you can create [here](https://cloud.digitalocean.com/settings/applications)
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/dnsomatic.md

@@ -0,0 +1,32 @@
+# DNS-O-Matic
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dnsomatic",
+      "domain": "domain.com",
+      "host": "@",
+      "token": "yourtoken",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"` or `"*"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/dnspod.md

@@ -0,0 +1,31 @@
+# DNSPod
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dnspod",
+      "domain": "domain.com",
+      "host": "@",
+      "token": "yourtoken",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"token"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/dondominio.md

@@ -0,0 +1,33 @@
+# Don Dominio
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dondominio",
+      "domain": "domain.com",
+      "name": "something",
+      "username": "username",
+      "password": "password",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"name"` is the name server associated with the domain
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/dreamhost.md

@@ -0,0 +1,29 @@
+# Dreamhost
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dreamhost",
+      "domain": "domain.com",
+      "key": "key",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"key"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/duckdns.md

@@ -0,0 +1,35 @@
+# DuckDNS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "duckdns",
+      "host": "host",
+      "token": "token",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"host"` is your host, for example `subdomain` for `subdomain.duckdns.org`
+- `"token"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup
+
+[![DuckDNS Website](../readme/duckdns.png)](https://duckdns.org)
+
+*See the [duckdns website](https://duckdns.org)*

docs/dyndns.md

@@ -0,0 +1,35 @@
+# DynDNS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dyn",
+      "domain": "domain.com",
+      "host": "@",
+      "username": "username",
+      "password": "password",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup

docs/dynv6.md

@@ -0,0 +1,33 @@
+# DynV6
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dynv6",
+      "domain": "domain.com",
+      "host": "@",
+      "token": "token",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"token"` that you can obtain [here](https://dynv6.com/keys#token)
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup

docs/freedns.md

@@ -0,0 +1,31 @@
+# FreeDNS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "freedns",
+      "domain": "domain.com",
+      "host": "host",
+      "token": "token",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host (subdomain)
+- `"token"` is the randomized update token you use to update your record
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/gandi.md

@@ -0,0 +1,37 @@
+# Gandi
+
+This provider uses Gandi v5 API
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "gandi",
+      "domain": "domain.com",
+      "host": "@",
+      "key": "key",
+      "ttl": 3600,
+      "ip_version": "ipv4",
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` which can be a subdomain, `@` or a wildcard `*`
+- `"key"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"ttl"` default is `3600`
+
+## Domain setup
+
+[Gandi Documentation Website](https://docs.gandi.net/en/domain_names/advanced_users/api.html#gandi-s-api)

docs/godaddy.md

@@ -0,0 +1,61 @@
+# GoDaddy
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "godaddy",
+      "domain": "domain.com",
+      "host": "@",
+      "key": "key",
+      "secret": "secret",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain, `"@"` or `"*"` generally
+- `"key"`
+- `"secret"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup
+
+[![GoDaddy Website](../readme/godaddy.png)](https://godaddy.com)
+
+1. Login to [https://developer.godaddy.com/keys](https://developer.godaddy.com/keys/) with your account credentials.
+
+[![GoDaddy Developer Login](../readme/godaddy1.gif)](https://developer.godaddy.com/keys)
+
+1. Generate a Test key and secret.
+
+[![GoDaddy Developer Test Key](../readme/godaddy2.gif)](https://developer.godaddy.com/keys)
+
+1. Generate a **Production** key and secret.
+
+[![GoDaddy Developer Production Key](../readme/godaddy3.gif)](https://developer.godaddy.com/keys)
+
+Obtain the **key** and **secret** of that production key.
+
+In this example, the key is `dLP4WKz5PdkS_GuUDNigHcLQFpw4CWNwAQ5` and the secret is `GuUFdVFj8nJ1M79RtdwmkZ`.
+
+## Testing
+
+1. Go to [https://dcc.godaddy.com/manage/yourdomain.com/dns](https://dcc.godaddy.com/manage/yourdomain.com/dns) (replace yourdomain.com)
+
+    [![GoDaddy DNS management](../readme/godaddydnsmanagement.png)](https://dcc.godaddy.com/manage/)
+
+1. Change the IP address to `127.0.0.1`
+1. Run the ddns-updater
+1. Refresh the Godaddy webpage to check the update occurred.

docs/google.md

@@ -0,0 +1,42 @@
+# Google
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "godaddy",
+      "domain": "domain.com",
+      "host": "@",
+      "username": "username",
+      "password": "password",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"` or `"*"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup
+
+Thanks to [@gauravspatel](https://github.com/gauravspatel) for #124
+
+1. Enable dynamic DNS in the *synthetic records* section of DNS management.
+1. The username and password is generated once you create the dynamic DNS entry.
+
+### Wildcard entries
+
+If you want to create a **wildcard entry**, you have to create a custom **CNAME** record with key `"*"` and value `"@"`.

docs/he.net.md

@@ -0,0 +1,31 @@
+# He.net
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "he",
+      "domain": "domain.com",
+      "host": "@",
+      "password": "password",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"` or `"*"` (untested)
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/infomaniak.md

@@ -0,0 +1,34 @@
+# Infomaniak
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "infomaniak",
+      "domain": "domain.com",
+      "host": "@",
+      "password": "password",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup

docs/linode.md

@@ -0,0 +1,34 @@
+# Linode
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "linode",
+      "domain": "domain.com",
+      "host": "@",
+      "token": "token",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"` or `"*"`
+- `"token"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup
+
+1. Create a personal access token with `domains` set, with read and write privileges, ideally that never expires. You can refer to [@AnujRNair's comment](https://github.com/qdm12/ddns-updater/pull/144#discussion_r559292678) and to [Linode's guide](https://www.linode.com/docs/products/tools/cloud-manager/guides/cloud-api-keys).
+1. The program will create the A or AAAA record for you if it doesn't exist already.

docs/luadns.md

@@ -0,0 +1,37 @@
+# LuaDNS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "luadns",
+      "domain": "domain.com",
+      "host": "@",
+      "email": "email",
+      "token": "token",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"` or `"*"`
+- `"email"`
+- `"token"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup
+
+1. Go to [api.luadns.com/settings](https://api.luadns.com/settings)
+1. Enable API access
+1. Obtain your API token and replace it in the parameters as the value for `token`

docs/namecheap.md

@@ -0,0 +1,57 @@
+# Namecheap
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "namecheap",
+      "domain": "domain.com",
+      "host": "@",
+      "password": "password",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain, `"@"` or `"*"` generally
+- `"password"`
+
+### Optional parameters
+
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+Note that Namecheap only supports ipv4 addresses for now.
+
+## Domain setup
+
+[![Namecheap Website](../readme/namecheap.png)](https://www.namecheap.com)
+
+1. Create a Namecheap account and buy a domain name - *example.com* as an example
+1. Login to Namecheap at [https://www.namecheap.com/myaccount/login.aspx](https://www.namecheap.com/myaccount/login.aspx)
+
+For **each domain name** you want to add, replace *example.com* in the following link with your domain name and go to [https://ap.www.namecheap.com/Domains/DomainControlPanel/**example.com**/advancedns](https://ap.www.namecheap.com/Domains/DomainControlPanel/example.com/advancedns)
+
+1. For each host you want to add (if you don't know, create one record with the host set to `*`):
+    1. In the *HOST RECORDS* section, click on *ADD NEW RECORD*
+
+        ![https://ap.www.namecheap.com/Domains/DomainControlPanel/mealracle.com/advancedns](../readme/namecheap1.png)
+
+    1. Select the following settings and create the *A + Dynamic DNS Record*:
+
+        ![https://ap.www.namecheap.com/Domains/DomainControlPanel/mealracle.com/advancedns](../readme/namecheap2.png)
+
+1. Scroll down and turn on the switch for *DYNAMIC DNS*
+
+    ![https://ap.www.namecheap.com/Domains/DomainControlPanel/mealracle.com/advancedns](../readme/namecheap3.png)
+
+1. The Dynamic DNS Password will appear, which is `0e4512a9c45a4fe88313bcc2234bf547` in this example.
+
+    ![https://ap.www.namecheap.com/Domains/DomainControlPanel/mealracle.com/advancedns](../readme/namecheap4.png)

docs/noip.md

@@ -0,0 +1,34 @@
+# NoIP
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "noip",
+      "domain": "domain.com",
+      "host": "@",
+      "password": "password",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup

docs/opendns.md

@@ -0,0 +1,35 @@
+# OpenDNS
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "dyn",
+      "domain": "domain.com",
+      "host": "@",
+      "username": "username",
+      "password": "password",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"username"`
+- `"password"`
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup

docs/ovh.md

@@ -0,0 +1,51 @@
+# OVH
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "ovh",
+      "domain": "domain.com",
+      "host": "@",
+      "username": "username",
+      "password": "password",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+
+#### Using DynHost
+
+- `"username"`
+- `"password"`
+
+#### OR Using ZoneDNS
+
+- `"api_endpoint"` default value is `"ovh-eu"`
+- `"app_key"`
+- `"app_secret"`
+- `"consumer_key"`
+
+The ZoneDNS implementation allows you to update any record name including *.yourdomain.tld
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+- `"mode"` select between two modes, OVH's dynamic hosting service (`"dynamic"`) or OVH's API (`"api"`). Default is `"dynamic"`
+
+## Domain setup
+
+- If you use DynHost: [docs.ovh.com/ie/en/domains/hosting_dynhost](https://docs.ovh.com/ie/en/domains/hosting_dynhost/)
+- If you use the ZoneDNS API: [docs.ovh.com/gb/en/customer/first-steps-with-ovh-api](https://docs.ovh.com/gb/en/customer/first-steps-with-ovh-api/)

docs/selfhost.de.md

@@ -0,0 +1,33 @@
+# Selfhost.de
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "selfhost.de",
+      "domain": "domain.com",
+      "host": "@",
+      "username": "username",
+      "password": "password",
+      "ip_version": "ipv4"
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"username"` is your DynDNS username
+- `"password"` is your DynDNS password
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+
+## Domain setup

docs/strato.md

@@ -0,0 +1,35 @@
+# Strato
+
+## Configuration
+
+### Example
+
+```json
+{
+  "settings": [
+    {
+      "provider": "strato",
+      "domain": "domain.com",
+      "host": "@",
+      "password": "password",
+      "ip_version": "ipv4",
+      "provider_ip": true
+    }
+  ]
+}
+```
+
+### Compulsory parameters
+
+- `"domain"`
+- `"host"` is your host and can be a subdomain or `"@"`
+- `"password"` is your dyndns password
+
+### Optional parameters
+
+- `"ip_version"` can be `ipv4` (A records) or `ipv6` (AAAA records), defaults to `ipv4 or ipv6`
+- `"provider_ip"` can be set to `true` to let your DNS provider determine your IPv4 address (and/or IPv6 address) automatically when you send an update request, without sending the new IP address detected by the program in the request.
+
+## Domain setup
+
+See [their article](https://www.strato.com/faq/en_us/domain/this-is-how-easy-it-is-to-set-up-dyndns-for-your-domains/)

go.mod

@@ -1,11 +1,13 @@
 module github.com/qdm12/ddns-updater
 
-go 1.15
+go 1.16
 
 require (
-	github.com/golang/mock v1.4.4
-	github.com/google/uuid v1.1.1
+	github.com/go-chi/chi v1.5.1
+	github.com/golang/mock v1.4.3
 	github.com/kyokomi/emoji v2.2.4+incompatible
-	github.com/qdm12/golibs v0.0.0-20200712151944-a0325873bf5a
+	github.com/miekg/dns v1.1.40
+	github.com/ovh/go-ovh v1.1.0
+	github.com/qdm12/golibs v0.0.0-20210215133151-c711ebd3e56a
 	github.com/stretchr/testify v1.6.1
 )

go.sum

@@ -1,5 +1,3 @@
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/PuerkitoBio/purell v1.1.0 h1:rmGxhojJlM0tuKtfdvliR84CFHljx9ag64t2xmVkjK4=
 github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
@@ -9,11 +7,14 @@ github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:l
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/docker/go-units v0.3.3 h1:Xk8S3Xj5sLGlG5g67hJmYMmUgXv5N4PhkjJHHqrwnTk=
 github.com/docker/go-units v0.3.3/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
 github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/globalsign/mgo v0.0.0-20180905125535-1ca0a4f7cbcb h1:D4uzjWwKYQ5XnAvUbuvHW93esHg7F8N/OYeBBcJoTr0=
 github.com/globalsign/mgo v0.0.0-20180905125535-1ca0a4f7cbcb/go.mod h1:xkRDCp4j0OGD1HRkm4kmhM+pmpv3AKq5SU7GMg4oO/Q=
+github.com/go-chi/chi v1.5.1 h1:kfTK3Cxd/dkMu/rKs5ZceWYp+t5CtiE7vmaTv3LjC6w=
+github.com/go-chi/chi v1.5.1/go.mod h1:REp24E+25iKvxgeTfHmdUoL5x15kBiDBlnIl5bCwe2k=
 github.com/go-openapi/analysis v0.0.0-20180825180245-b006789cd277/go.mod h1:k70tL6pCuVxPJOHXQ+wIac1FUrvNkHolPie/cLEU6hI=
 github.com/go-openapi/analysis v0.17.0 h1:8JV+dzJJiK46XqGLqqLav8ZfEiJECp8jlOFhpiCdZ+0=
 github.com/go-openapi/analysis v0.17.0/go.mod h1:IowGgpVeD0vNm45So8nr+IcQ3pxVtpRoBWb8PVZO0ik=
@@ -39,22 +40,16 @@ github.com/go-openapi/validate v0.17.0 h1:pqoViQz3YLOGIhAmD0N4Lt6pa/3Gnj3ymKqQwq
 github.com/go-openapi/validate v0.17.0/go.mod h1:Uh4HdOzKt19xGIGm1qHf/ofbX1YQ4Y+MYsct2VUrAJ4=
 github.com/golang/mock v1.4.3 h1:GV+pQPG/EUUbkh47niozDcADz6go/dUwhVzdUQHIVRw=
 github.com/golang/mock v1.4.3/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
-github.com/golang/mock v1.4.4 h1:l75CXGRSwbaYNpl/Z2X1XIIAMSCquvXgpVZDhwEIJsc=
-github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4=
 github.com/gomodule/redigo v2.0.0+incompatible h1:K/R+8tc58AaqLkqG2Ol3Qk+DR/TlNuhuh457pBFPtt0=
 github.com/gomodule/redigo v2.0.0+incompatible/go.mod h1:B4C85qUVwatsJoIUNIfCRsp7qO0iAmpGFZ4EELWSbC4=
-github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
+github.com/google/uuid v1.0.0 h1:b4Gk+7WdP/d3HZH8EJsZpvV7EtDOgaZLtnaNGIu1adA=
 github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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@@ -64,78 +59,71 @@ github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVc
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internal/constants/ip.go

@@ -1,9 +0,0 @@
-package constants
-
-import "github.com/qdm12/ddns-updater/internal/models"
-
-const (
-	IPv4       models.IPVersion = "ipv4"
-	IPv6       models.IPVersion = "ipv6"
-	IPv4OrIPv6 models.IPVersion = "ipv4 or ipv6"
-)

internal/constants/ipmethod.go

@@ -1,77 +0,0 @@
-package constants
-
-import (
-	"github.com/qdm12/ddns-updater/internal/models"
-)
-
-func IPMethods() []models.IPMethod {
-	return []models.IPMethod{
-		{
-			Name: "cycle",
-		},
-		{
-			Name: "opendns",
-			URL:  "https://diagnostic.opendns.com/myip",
-			IPv4: true,
-			IPv6: true,
-		},
-		{
-			Name: "ifconfig",
-			URL:  "https://ifconfig.io/ip",
-			IPv4: true,
-			IPv6: true,
-		},
-		{
-			Name: "ipinfo",
-			URL:  "https://ipinfo.io/ip",
-			IPv4: true,
-			IPv6: true,
-		},
-		{
-			Name: "ipify",
-			URL:  "https://api.ipify.org",
-			IPv4: true,
-		},
-		{
-			Name: "ipify6",
-			URL:  "https://api6.ipify.org",
-			IPv6: true,
-		},
-		{
-			Name: "ddnss4",
-			URL:  "https://ip4.ddnss.de/meineip.php",
-			IPv4: true,
-		},
-		{
-			Name: "ddnss6",
-			URL:  "https://ip6.ddnss.de/meineip.php",
-			IPv6: true,
-		},
-		{
-			Name: "google",
-			URL:  "https://domains.google.com/checkip",
-			IPv4: true,
-			IPv6: true,
-		},
-		{
-			Name: "noip4",
-			URL:  "http://ip1.dynupdate.no-ip.com",
-			IPv4: true,
-		},
-		{
-			Name: "noip6",
-			URL:  "http://ip1.dynupdate6.no-ip.com",
-			IPv6: true,
-		},
-		{
-			Name: "noip8245_4",
-			URL:  "http://ip1.dynupdate.no-ip.com:8245",
-			IPv4: true,
-		},
-		{
-			Name: "noip8245_6",
-			URL:  "http://ip1.dynupdate6.no-ip.com:8245",
-			IPv6: true,
-		},
-	}
-}

internal/constants/providers.go

@@ -2,37 +2,59 @@ package constants
 
 import "github.com/qdm12/ddns-updater/internal/models"
 
-// All possible provider values
+// All possible provider values.
 const (
-	CLOUDFLARE models.Provider = "cloudflare"
-	DDNSSDE    models.Provider = "ddnss"
-	DONDOMINIO models.Provider = "dondominio"
-	DNSPOD     models.Provider = "dnspod"
-	DUCKDNS    models.Provider = "duckdns"
-	DYN        models.Provider = "dyn"
-	DREAMHOST  models.Provider = "dreamhost"
-	GODADDY    models.Provider = "godaddy"
-	GOOGLE     models.Provider = "google"
-	HE         models.Provider = "he"
-	INFOMANIAK models.Provider = "infomaniak"
-	NAMECHEAP  models.Provider = "namecheap"
-	NOIP       models.Provider = "noip"
+	CLOUDFLARE   models.Provider = "cloudflare"
+	DIGITALOCEAN models.Provider = "digitalocean"
+	DDNSSDE      models.Provider = "ddnss"
+	DONDOMINIO   models.Provider = "dondominio"
+	DNSOMATIC    models.Provider = "dnsomatic"
+	DNSPOD       models.Provider = "dnspod"
+	DUCKDNS      models.Provider = "duckdns"
+	DYN          models.Provider = "dyn"
+	DYNV6        models.Provider = "dynv6"
+	DREAMHOST    models.Provider = "dreamhost"
+	FREEDNS      models.Provider = "freedns"
+	GANDI        models.Provider = "gandi"
+	GODADDY      models.Provider = "godaddy"
+	GOOGLE       models.Provider = "google"
+	HE           models.Provider = "he"
+	INFOMANIAK   models.Provider = "infomaniak"
+	LINODE       models.Provider = "linode"
+	LUADNS       models.Provider = "luadns"
+	NAMECHEAP    models.Provider = "namecheap"
+	NOIP         models.Provider = "noip"
+	OPENDNS      models.Provider = "opendns"
+	OVH          models.Provider = "ovh"
+	SELFHOSTDE   models.Provider = "selfhost.de"
+	STRATO       models.Provider = "strato"
 )
 
 func ProviderChoices() []models.Provider {
 	return []models.Provider{
 		CLOUDFLARE,
+		DIGITALOCEAN,
 		DDNSSDE,
 		DONDOMINIO,
+		DNSOMATIC,
 		DNSPOD,
 		DUCKDNS,
 		DYN,
+		DYNV6,
 		DREAMHOST,
+		FREEDNS,
+		GANDI,
 		GODADDY,
 		GOOGLE,
 		HE,
 		INFOMANIAK,
+		LINODE,
+		LUADNS,
 		NAMECHEAP,
 		NOIP,
+		OVH,
+		OPENDNS,
+		SELFHOSTDE,
+		STRATO,
 	}
 }

internal/constants/splash.go

@@ -1,13 +1,13 @@
 package constants
 
 const (
-	// Announcement is a message announcement
+	// Announcement is a message announcement.
 	Announcement = "Support for he.net"
-	// AnnouncementExpiration is the expiration date of the announcement in format yyyy-mm-dd
+	// AnnouncementExpiration is the expiration date of the announcement in format yyyy-mm-dd.
 	AnnouncementExpiration = "2020-10-15"
 )
 
 const (
-	// IssueLink is the link for users to use to create issues
+	// IssueLink is the link for users to use to create issues.
 	IssueLink = "https://github.com/qdm12/ddns-updater/issues/new"
 )

internal/data/data.go

@@ -10,11 +10,10 @@ import (
 
 type Database interface {
 	Close() error
-	Insert(record records.Record) (id int)
 	Select(id int) (record records.Record, err error)
 	SelectAll() (records []records.Record)
+	// Using persistence database
 	Update(id int, record records.Record) error
-	// From persistence database
 	GetEvents(domain, host string) (events []models.HistoryEvent, err error)
 }
 
@@ -24,7 +23,7 @@ type database struct {
 	persistentDB persistence.Database
 }
 
-// NewDatabase creates a new in memory database
+// NewDatabase creates a new in memory database.
 func NewDatabase(data []records.Record, persistentDB persistence.Database) Database {
 	return &database{
 		data:         data,

internal/data/memory.go

@@ -6,13 +6,6 @@ import (
 	"github.com/qdm12/ddns-updater/internal/records"
 )
 
-func (db *database) Insert(record records.Record) (id int) {
-	db.Lock()
-	defer db.Unlock()
-	db.data = append(db.data, record)
-	return len(db.data) - 1
-}
-
 func (db *database) Select(id int) (record records.Record, err error) {
 	db.RLock()
 	defer db.RUnlock()

internal/handlers/handlers.go

@@ -1,37 +0,0 @@
-package handlers
-
-import (
-	"fmt"
-	"net/http"
-	"text/template"
-	"time"
-
-	"github.com/qdm12/ddns-updater/internal/data"
-	"github.com/qdm12/ddns-updater/internal/models"
-	"github.com/qdm12/golibs/logging"
-)
-
-// MakeHandler returns a router with all the necessary routes configured
-func MakeHandler(rootURL, uiDir string, db data.Database, logger logging.Logger, forceUpdate func(), timeNow func() time.Time) http.HandlerFunc {
-	logger = logger.WithPrefix("http server: ")
-	return func(w http.ResponseWriter, r *http.Request) {
-		logger.Info("HTTP %s %s", r.Method, r.RequestURI)
-		switch {
-		case r.Method == http.MethodGet && r.RequestURI == rootURL+"/":
-			t := template.Must(template.ParseFiles(uiDir + "/index.html"))
-			var htmlData models.HTMLData
-			for _, record := range db.SelectAll() {
-				row := record.HTML(timeNow())
-				htmlData.Rows = append(htmlData.Rows, row)
-			}
-			if err := t.ExecuteTemplate(w, "index.html", htmlData); err != nil {
-				logger.Warn(err)
-				fmt.Fprint(w, "An error occurred creating this webpage")
-			}
-		case r.Method == http.MethodGet && r.RequestURI == rootURL+"/update":
-			logger.Info("Update started manually")
-			forceUpdate()
-			http.Redirect(w, r, rootURL, 301)
-		}
-	}
-}

internal/health/check.go

@@ -1,4 +1,4 @@
-package healthcheck
+package health
 
 import (
 	"fmt"
@@ -12,18 +12,19 @@ import (
 
 type lookupIPFunc func(host string) ([]net.IP, error)
 
-// IsHealthy checks all the records were updated successfully and returns an error if not
-func IsHealthy(db data.Database, lookupIP lookupIPFunc, logger logging.Logger) (err error) {
-	defer func() {
-		if err != nil {
-			logger.Warn("unhealthy: %s", err)
-		}
-	}()
+func MakeIsHealthy(db data.Database, lookupIP lookupIPFunc, logger logging.Logger) func() error {
+	return func() (err error) {
+		return isHealthy(db, lookupIP)
+	}
+}
+
+// isHealthy checks all the records were updated successfully and returns an error if not.
+func isHealthy(db data.Database, lookupIP lookupIPFunc) (err error) {
 	records := db.SelectAll()
 	for _, record := range records {
 		if record.Status == constants.FAIL {
 			return fmt.Errorf("%s", record.String())
-		} else if !record.Settings.DNSLookup() {
+		} else if record.Settings.Proxied() {
 			continue
 		}
 		hostname := record.Settings.BuildDomainName()
@@ -45,7 +46,8 @@ func IsHealthy(db data.Database, lookupIP lookupIPFunc, logger logging.Logger) (
 			}
 		}
 		if !found {
-			return fmt.Errorf("lookup IP addresses for %s are %s instead of %s", hostname, strings.Join(lookedUpIPsString, ","), currentIP)
+			return fmt.Errorf("lookup IP addresses for %s are %s instead of %s",
+				hostname, strings.Join(lookedUpIPsString, ","), currentIP)
 		}
 	}
 	return nil

internal/health/client.go

@@ -0,0 +1,53 @@
+package health
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+)
+
+func IsClientMode(args []string) bool {
+	return len(args) > 1 && args[1] == "healthcheck"
+}
+
+type Client interface {
+	Query(ctx context.Context) error
+}
+
+type client struct {
+	*http.Client
+}
+
+func NewClient() Client {
+	const timeout = 5 * time.Second
+	return &client{
+		Client: &http.Client{Timeout: timeout},
+	}
+}
+
+// Query sends an HTTP request to the other instance of
+// the program, and to its internal healthcheck server.
+func (c *client) Query(ctx context.Context) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "http://127.0.0.1:9999", nil)
+	if err != nil {
+		return err
+	}
+	resp, err := c.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusOK {
+		return nil
+	}
+
+	b, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return fmt.Errorf("%s: %s", resp.Status, err)
+	}
+
+	return fmt.Errorf(string(b))
+}

internal/health/handler.go

@@ -0,0 +1,31 @@
+package health
+
+import (
+	"net/http"
+
+	"github.com/qdm12/golibs/logging"
+)
+
+func newHandler(logger logging.Logger, healthcheck func() error) http.Handler {
+	return &handler{
+		logger:      logger,
+		healthcheck: healthcheck,
+	}
+}
+
+type handler struct {
+	logger      logging.Logger
+	healthcheck func() error
+}
+
+func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet || (r.RequestURI != "" && r.RequestURI != "/") {
+		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+		return
+	}
+	if err := h.healthcheck(); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.WriteHeader(http.StatusOK)
+}

internal/health/server.go

@@ -0,0 +1,53 @@
+package health
+
+import (
+	"context"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/qdm12/golibs/logging"
+)
+
+type Server interface {
+	Run(ctx context.Context, wg *sync.WaitGroup)
+}
+
+type server struct {
+	address string
+	logger  logging.Logger
+	handler http.Handler
+}
+
+func NewServer(address string, logger logging.Logger, healthcheck func() error) Server {
+	handler := newHandler(logger, healthcheck)
+	return &server{
+		address: address,
+		logger:  logger,
+		handler: handler,
+	}
+}
+
+func (s *server) Run(ctx context.Context, wg *sync.WaitGroup) {
+	defer wg.Done()
+	server := http.Server{Addr: s.address, Handler: s.handler}
+	go func() {
+		<-ctx.Done()
+		s.logger.Warn("shutting down (context canceled)")
+		defer s.logger.Warn("shut down")
+		const shutdownGraceDuration = 2 * time.Second
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGraceDuration)
+		defer cancel()
+		if err := server.Shutdown(shutdownCtx); err != nil {
+			s.logger.Error("failed shutting down: %s", err)
+		}
+	}()
+	for ctx.Err() == nil {
+		s.logger.Info("listening on %s", s.address)
+		err := server.ListenAndServe()
+		if err != nil && ctx.Err() == nil { // server crashed
+			s.logger.Error(err)
+			s.logger.Info("restarting")
+		}
+	}
+}

internal/models/alias.go

@@ -1,12 +1,10 @@
 package models
 
 type (
-	// Provider is a possible DNS provider
+	// Provider is a possible DNS provider.
 	Provider string
-	// Status is the record config status
+	// Status is the record config status.
 	Status string
-	// HTML is for constants HTML strings
+	// HTML is for constants HTML strings.
 	HTML string
-	// IPVersion is ipv4 or ipv6
-	IPVersion string
 )

internal/models/build.go

@@ -0,0 +1,7 @@
+package models
+
+type BuildInformation struct {
+	Version   string `json:"version"`
+	Commit    string `json:"commit"`
+	BuildDate string `json:"buildDate"`
+}

internal/models/history.go

@@ -8,7 +8,7 @@ import (
 )
 
 // History contains current and previous IP address for a particular record
-// with the latest success time
+// with the latest success time.
 type History []HistoryEvent // current and previous ips
 
 type HistoryEvent struct { // current and previous ips
@@ -23,13 +23,14 @@ func (h History) GetPreviousIPs() []net.IP {
 		return nil
 	}
 	IPs := make([]net.IP, len(h)-1)
-	for i := len(h) - 2; i >= 0; i-- {
+	const two = 2
+	for i := len(h) - two; i >= 0; i-- {
 		IPs[i] = h[i].IP
 	}
 	return IPs
 }
 
-// GetCurrentIP returns the current IP address (latest in history)
+// GetCurrentIP returns the current IP address (latest in history).
 func (h History) GetCurrentIP() net.IP {
 	if len(h) < 1 {
 		return nil
@@ -37,7 +38,7 @@ func (h History) GetCurrentIP() net.IP {
 	return h[len(h)-1].IP
 }
 
-// GetSuccessTime returns the latest success update time
+// GetSuccessTime returns the latest success update time.
 func (h History) GetSuccessTime() time.Time {
 	if len(h) < 1 {
 		return time.Time{}
@@ -50,6 +51,7 @@ func (h History) GetDurationSinceSuccess(now time.Time) string {
 		return "N/A"
 	}
 	duration := now.Sub(h[len(h)-1].Time)
+	const hoursInDay = 24
 	switch {
 	case duration < time.Minute:
 		return fmt.Sprintf("%ds", int(duration.Round(time.Second).Seconds()))
@@ -58,7 +60,7 @@ func (h History) GetDurationSinceSuccess(now time.Time) string {
 	case duration < 24*time.Hour:
 		return fmt.Sprintf("%dh", int(duration.Round(time.Hour).Hours()))
 	default:
-		return fmt.Sprintf("%dd", int(duration.Round(time.Hour*24).Hours()/24))
+		return fmt.Sprintf("%dd", int(duration.Round(time.Hour*hoursInDay).Hours()/hoursInDay))
 	}
 }
 

internal/models/ipmethod.go

@@ -1,6 +1,6 @@
 package models
 
-// IPMethod is a method to obtain your public IP address
+// IPMethod is a method to obtain your public IP address.
 type IPMethod struct {
 	Name string
 	URL  string

internal/network/publicip.go

@@ -1,109 +0,0 @@
-package network
-
-import (
-	"bytes"
-	"fmt"
-	"net"
-	"net/http"
-	"sort"
-	"strings"
-
-	"github.com/qdm12/ddns-updater/internal/constants"
-	"github.com/qdm12/ddns-updater/internal/models"
-	"github.com/qdm12/golibs/network"
-	"github.com/qdm12/golibs/verification"
-)
-
-// GetPublicIP downloads a webpage and extracts the IP address from it
-func GetPublicIP(client network.Client, url string, ipVersion models.IPVersion) (ip net.IP, err error) {
-	content, status, err := client.GetContent(url)
-	if err != nil {
-		return nil, fmt.Errorf("cannot get public %s address: %w", ipVersion, err)
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("cannot get public %s address from %s: HTTP status code %d", ipVersion, url, status)
-	}
-	s := string(content)
-	switch ipVersion {
-	case constants.IPv4:
-		return searchIP(constants.IPv4, s)
-	case constants.IPv6:
-		return searchIP(constants.IPv6, s)
-	case constants.IPv4OrIPv6:
-		var ipv4Err, ipv6Err error
-		ip, ipv4Err = searchIP(constants.IPv4, s)
-		if ipv4Err != nil {
-			ip, ipv6Err = searchIP(constants.IPv6, s)
-		}
-		if ipv6Err != nil {
-			return nil, fmt.Errorf("%s, %s", ipv4Err, ipv6Err)
-		}
-		return ip, nil
-	default:
-		return nil, fmt.Errorf("ip version %q not supported", ipVersion)
-	}
-}
-
-func searchIP(version models.IPVersion, s string) (ip net.IP, err error) {
-	verifier := verification.NewVerifier()
-	var regexSearch func(s string) []string
-	switch version {
-	case constants.IPv4:
-		regexSearch = verifier.SearchIPv4
-	case constants.IPv6:
-		regexSearch = verifier.SearchIPv6
-	default:
-		return nil, fmt.Errorf("ip version %q is not supported for regex search", version)
-	}
-	ips := regexSearch(s)
-	if ips == nil {
-		return nil, fmt.Errorf("no public %s address found", version)
-	}
-	uniqueIPs := make(map[string]struct{})
-	for _, ipString := range ips {
-		uniqueIPs[ipString] = struct{}{}
-	}
-	netIPs := []net.IP{}
-	for ipString := range uniqueIPs {
-		netIP := net.ParseIP(ipString)
-		if netIP == nil || netIPIsPrivate(netIP) {
-			// in case the regex is not restrictive enough
-			// or the IP address is private
-			continue
-		}
-		netIPs = append(netIPs, netIP)
-	}
-	switch len(netIPs) {
-	case 0:
-		return nil, fmt.Errorf("no public %s address found", version)
-	case 1:
-		return netIPs[0], nil
-	default:
-		sort.Slice(netIPs, func(i, j int) bool {
-			return bytes.Compare(netIPs[i], netIPs[j]) < 0
-		})
-		ips = make([]string, len(netIPs))
-		for i := range netIPs {
-			ips[i] = netIPs[i].String()
-		}
-		return nil, fmt.Errorf("multiple public %s addresses found: %s", version, strings.Join(ips, " "))
-	}
-}
-
-func netIPIsPrivate(netIP net.IP) bool {
-	for _, privateCIDRBlock := range [8]string{
-		"127.0.0.1/8",    // localhost
-		"10.0.0.0/8",     // 24-bit block
-		"172.16.0.0/12",  // 20-bit block
-		"192.168.0.0/16", // 16-bit block
-		"169.254.0.0/16", // link local address
-		"::1/128",        // localhost IPv6
-		"fc00::/7",       // unique local address IPv6
-		"fe80::/10",      // link local address IPv6
-	} {
-		_, CIDR, _ := net.ParseCIDR(privateCIDRBlock)
-		if CIDR.Contains(netIP) {
-			return true
-		}
-	}
-	return false
-}

internal/network/publicip_test.go

@@ -1,155 +0,0 @@
-package network
-
-import (
-	"fmt"
-	"net"
-	"net/http"
-	"testing"
-
-	"github.com/golang/mock/gomock"
-	"github.com/qdm12/ddns-updater/internal/constants"
-	"github.com/qdm12/ddns-updater/internal/models"
-	"github.com/qdm12/golibs/network/mock_network"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func Test_GetPublicIP(t *testing.T) {
-	t.Parallel()
-	tests := map[string]struct {
-		IPVersion   models.IPVersion
-		mockContent []byte
-		mockStatus  int
-		mockErr     error
-		ip          net.IP
-		err         error
-	}{
-		"network error": {
-			IPVersion: constants.IPv4,
-			mockErr:   fmt.Errorf("error"),
-			err:       fmt.Errorf("cannot get public ipv4 address: error"),
-		},
-		"bad status": {
-			IPVersion:  constants.IPv4,
-			mockStatus: http.StatusUnauthorized,
-			err:        fmt.Errorf("cannot get public ipv4 address from https://getmyip.com: HTTP status code 401"),
-		},
-		"ipv4 address": {
-			IPVersion:   constants.IPv4,
-			mockContent: []byte("55.55.55.55"),
-			mockStatus:  http.StatusOK,
-			ip:          net.IP{55, 55, 55, 55},
-		},
-		"ipv6 address": {
-			IPVersion:   constants.IPv6,
-			mockContent: []byte("ad07:e846:51ac:6cd0:0000:0000:0000:0000"),
-			mockStatus:  http.StatusOK,
-			ip:          net.IP{0xad, 0x7, 0xe8, 0x46, 0x51, 0xac, 0x6c, 0xd0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
-		},
-		"ipv4 or ipv6 found ipv4": {
-			IPVersion:   constants.IPv4OrIPv6,
-			mockContent: []byte("55.55.55.55"),
-			mockStatus:  http.StatusOK,
-			ip:          net.IP{55, 55, 55, 55},
-		},
-		"ipv4 or ipv6 found ipv6": {
-			IPVersion:   constants.IPv4OrIPv6,
-			mockContent: []byte("ad07:e846:51ac:6cd0:0000:0000:0000:0000"),
-			mockStatus:  http.StatusOK,
-			ip:          net.IP{0xad, 0x7, 0xe8, 0x46, 0x51, 0xac, 0x6c, 0xd0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
-		},
-		"ipv4 or ipv6 not found": {
-			IPVersion:   constants.IPv4OrIPv6,
-			mockContent: []byte("abc"),
-			mockStatus:  http.StatusOK,
-			err:         fmt.Errorf("no public ipv4 address found, no public ipv6 address found"),
-		},
-		"unsupported ip version": {
-			IPVersion:  models.IPVersion("x"),
-			mockStatus: http.StatusOK,
-			err:        fmt.Errorf("ip version \"x\" not supported"),
-		},
-	}
-	const URL = "https://getmyip.com"
-	for name, tc := range tests {
-		tc := tc
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-			mockCtrl := gomock.NewController(t)
-			defer mockCtrl.Finish()
-			client := mock_network.NewMockClient(mockCtrl)
-			client.EXPECT().GetContent(URL).Return(tc.mockContent, tc.mockStatus, tc.mockErr).Times(1)
-			ip, err := GetPublicIP(client, URL, tc.IPVersion)
-			if tc.err != nil {
-				require.Error(t, err)
-				assert.Equal(t, tc.err.Error(), err.Error())
-			} else {
-				assert.NoError(t, err)
-			}
-			assert.True(t, tc.ip.Equal(ip))
-		})
-	}
-}
-
-func Test_searchIP(t *testing.T) {
-	t.Parallel()
-	tests := map[string]struct {
-		IPVersion models.IPVersion
-		s         string
-		ip        net.IP
-		err       error
-	}{
-		"unsupported ip version": {
-			IPVersion: constants.IPv4OrIPv6,
-			err:       fmt.Errorf("ip version \"ipv4 or ipv6\" is not supported for regex search"),
-		},
-		"no content": {
-			IPVersion: constants.IPv4,
-			err:       fmt.Errorf("no public ipv4 address found"),
-		},
-		"single ipv4 address": {
-			IPVersion: constants.IPv4,
-			s:         "abcd 55.55.55.55 abcd",
-			ip:        net.IP{55, 55, 55, 55},
-		},
-		"single ipv6 address": {
-			IPVersion: constants.IPv6,
-			s:         "abcd bd07:e846:51ac:6cd0:0000:0000:0000:0000 abcd",
-			ip:        net.IP{0xbd, 0x7, 0xe8, 0x46, 0x51, 0xac, 0x6c, 0xd0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
-		},
-		"single private ipv4 address": {
-			IPVersion: constants.IPv4,
-			s:         "abcd 10.0.0.3 abcd",
-			err:       fmt.Errorf("no public ipv4 address found"),
-		},
-		"single private ipv6 address": {
-			IPVersion: constants.IPv6,
-			s:         "abcd ::1 abcd",
-			err:       fmt.Errorf("no public ipv6 address found"),
-		},
-		"2 ipv4 addresses": {
-			IPVersion: constants.IPv4,
-			s:         "55.55.55.55 56.56.56.56",
-			err:       fmt.Errorf("multiple public ipv4 addresses found: 55.55.55.55 56.56.56.56"),
-		},
-		"2 ipv6 addresses": {
-			IPVersion: constants.IPv6,
-			s:         "bd07:e846:51ac:6cd0:0000:0000:0000:0000  ad07:e846:51ac:6cd0:0000:0000:0000:0000",
-			err:       fmt.Errorf("multiple public ipv6 addresses found: ad07:e846:51ac:6cd0:: bd07:e846:51ac:6cd0::"), //nolint:golint
-		},
-	}
-	for name, tc := range tests {
-		tc := tc
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-			ip, err := searchIP(tc.IPVersion, tc.s)
-			if tc.err != nil {
-				require.Error(t, err)
-				assert.Equal(t, tc.err.Error(), err.Error())
-			} else {
-				assert.NoError(t, err)
-			}
-			assert.True(t, tc.ip.Equal(ip))
-		})
-	}
-}

internal/network/requests.go

@@ -1,21 +0,0 @@
-package network
-
-import (
-	"bytes"
-	"encoding/json"
-	"net/http"
-)
-
-// BuildHTTPPut is used for GoDaddy and Cloudflare only
-func BuildHTTPPut(url string, body interface{}) (request *http.Request, err error) {
-	b, err := json.Marshal(body)
-	if err != nil {
-		return nil, err
-	}
-	request, err = http.NewRequest(http.MethodPut, url, bytes.NewBuffer(b))
-	if err != nil {
-		return nil, err
-	}
-	request.Header.Set("Content-Type", "application/json")
-	return request, nil
-}

internal/params/json.go

@@ -9,23 +9,22 @@ import (
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
 	"github.com/qdm12/ddns-updater/internal/settings"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
-// nolint: maligned
 type commonSettings struct {
-	Provider    string `json:"provider"`
-	Domain      string `json:"domain"`
-	Host        string `json:"host"`
-	IPVersion   string `json:"ip_version"`
-	NoDNSLookup bool   `json:"no_dns_lookup"`
+	Provider  string `json:"provider"`
+	Domain    string `json:"domain"`
+	Host      string `json:"host"`
+	IPVersion string `json:"ip_version"`
 	// Retro values for warnings
 	IPMethod *string `json:"ip_method,omitempty"`
 	Delay    *uint64 `json:"delay,omitempty"`
 }
 
-// GetSettings obtain the update settings from the JSON content, first trying from the environment variable CONFIG
-// and then from the file config.json
-func (r *reader) GetSettings(filePath string) (allSettings []settings.Settings, warnings []string, err error) {
+// JSONSettings obtain the update settings from the JSON content, first trying from the environment variable CONFIG
+// and then from the file config.json.
+func (r *reader) JSONSettings(filePath string) (allSettings []settings.Settings, warnings []string, err error) {
 	allSettings, warnings, err = r.getSettingsFromEnv()
 	if allSettings != nil || warnings != nil || err != nil {
 		return allSettings, warnings, err
@@ -33,7 +32,7 @@ func (r *reader) GetSettings(filePath string) (allSettings []settings.Settings,
 	return r.getSettingsFromFile(filePath)
 }
 
-// getSettingsFromFile obtain the update settings from config.json
+// getSettingsFromFile obtain the update settings from config.json.
 func (r *reader) getSettingsFromFile(filePath string) (allSettings []settings.Settings, warnings []string, err error) {
 	bytes, err := r.readFile(filePath)
 	if err != nil {
@@ -42,9 +41,9 @@ func (r *reader) getSettingsFromFile(filePath string) (allSettings []settings.Se
 	return extractAllSettings(bytes)
 }
 
-// getSettingsFromEnv obtain the update settings from the environment variable CONFIG
+// getSettingsFromEnv obtain the update settings from the environment variable CONFIG.
 func (r *reader) getSettingsFromEnv() (allSettings []settings.Settings, warnings []string, err error) {
-	s, err := r.envParams.GetEnv("CONFIG")
+	s, err := r.env.Get("CONFIG")
 	if err != nil {
 		return nil, nil, err
 	} else if len(s) == 0 {
@@ -84,45 +83,57 @@ func extractAllSettings(jsonBytes []byte) (allSettings []settings.Settings, warn
 	return allSettings, warnings, nil
 }
 
-func makeSettingsFromObject(common commonSettings, rawSettings json.RawMessage, matcher regex.Matcher) (settingsSlice []settings.Settings, warnings []string, err error) {
+// TODO remove gocyclo.
+//nolint:gocyclo
+func makeSettingsFromObject(common commonSettings, rawSettings json.RawMessage, matcher regex.Matcher) (
+	settingsSlice []settings.Settings, warnings []string, err error) {
 	provider := models.Provider(common.Provider)
 	if provider == constants.DUCKDNS { // only hosts, no domain
 		if len(common.Domain) > 0 { // retro compatibility
 			if len(common.Host) == 0 {
 				common.Host = strings.TrimSuffix(common.Domain, ".duckdns.org")
-				warnings = append(warnings, fmt.Sprintf("DuckDNS record should have %q specified as host instead of %q as domain", common.Host, common.Domain))
+				warnings = append(warnings,
+					fmt.Sprintf("DuckDNS record should have %q specified as host instead of %q as domain",
+						common.Host, common.Domain))
 			} else {
-				warnings = append(warnings, fmt.Sprintf("ignoring domain %q because host %q is specified for DuckDNS record", common.Domain, common.Host))
+				warnings = append(warnings,
+					fmt.Sprintf("ignoring domain %q because host %q is specified for DuckDNS record",
+						common.Domain, common.Host))
 			}
 		}
 	}
 	hosts := strings.Split(common.Host, ",")
-	for _, host := range hosts {
-		if len(host) == 0 {
-			return nil, warnings, fmt.Errorf("host cannot be empty")
-		}
+
+	if len(common.IPVersion) == 0 {
+		common.IPVersion = ipversion.IP4or6.String()
 	}
-	ipVersion := models.IPVersion(common.IPVersion)
-	if len(ipVersion) == 0 {
-		ipVersion = constants.IPv4OrIPv6 // default
-	}
-	if ipVersion != constants.IPv4OrIPv6 && ipVersion != constants.IPv4 && ipVersion != constants.IPv6 {
-		return nil, warnings, fmt.Errorf("ip version %q is not valid", ipVersion)
+	ipVersion, err := ipversion.Parse(common.IPVersion)
+	if err != nil {
+		return nil, nil, err
 	}
+
 	var settingsConstructor settings.Constructor
 	switch provider {
 	case constants.CLOUDFLARE:
 		settingsConstructor = settings.NewCloudflare
+	case constants.DIGITALOCEAN:
+		settingsConstructor = settings.NewDigitalOcean
 	case constants.DDNSSDE:
 		settingsConstructor = settings.NewDdnss
 	case constants.DONDOMINIO:
 		settingsConstructor = settings.NewDonDominio
+	case constants.DNSOMATIC:
+		settingsConstructor = settings.NewDNSOMatic
 	case constants.DNSPOD:
 		settingsConstructor = settings.NewDNSPod
 	case constants.DREAMHOST:
 		settingsConstructor = settings.NewDreamhost
 	case constants.DUCKDNS:
 		settingsConstructor = settings.NewDuckdns
+	case constants.FREEDNS:
+		settingsConstructor = settings.NewFreedns
+	case constants.GANDI:
+		settingsConstructor = settings.NewGandi
 	case constants.GODADDY:
 		settingsConstructor = settings.NewGodaddy
 	case constants.GOOGLE:
@@ -131,18 +142,32 @@ func makeSettingsFromObject(common commonSettings, rawSettings json.RawMessage,
 		settingsConstructor = settings.NewHe
 	case constants.INFOMANIAK:
 		settingsConstructor = settings.NewInfomaniak
+	case constants.LINODE:
+		settingsConstructor = settings.NewLinode
+	case constants.LUADNS:
+		settingsConstructor = settings.NewLuaDNS
 	case constants.NAMECHEAP:
 		settingsConstructor = settings.NewNamecheap
 	case constants.NOIP:
 		settingsConstructor = settings.NewNoip
 	case constants.DYN:
 		settingsConstructor = settings.NewDyn
+	case constants.SELFHOSTDE:
+		settingsConstructor = settings.NewSelfhostde
+	case constants.STRATO:
+		settingsConstructor = settings.NewStrato
+	case constants.OVH:
+		settingsConstructor = settings.NewOVH
+	case constants.DYNV6:
+		settingsConstructor = settings.NewDynV6
+	case constants.OPENDNS:
+		settingsConstructor = settings.NewOpendns
 	default:
 		return nil, warnings, fmt.Errorf("provider %q is not supported", provider)
 	}
 	settingsSlice = make([]settings.Settings, len(hosts))
 	for i, host := range hosts {
-		settingsSlice[i], err = settingsConstructor(rawSettings, common.Domain, host, ipVersion, common.NoDNSLookup, matcher)
+		settingsSlice[i], err = settingsConstructor(rawSettings, common.Domain, host, ipVersion, matcher)
 		if err != nil {
 			return nil, warnings, err
 		}

internal/params/params.go

@@ -1,203 +1,215 @@
 package params
 
 import (
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/url"
+	"strings"
 	"time"
 
-	"github.com/qdm12/ddns-updater/internal/constants"
-	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/settings"
+	"github.com/qdm12/ddns-updater/pkg/publicip/http"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 	"github.com/qdm12/golibs/logging"
 	"github.com/qdm12/golibs/params"
-	libparams "github.com/qdm12/golibs/params"
-	"github.com/qdm12/golibs/verification"
 )
 
-const https = "https"
-
 type Reader interface {
 	// JSON
-	GetSettings(filePath string) (allSettings []settings.Settings, warnings []string, err error)
+	JSONSettings(filePath string) (allSettings []settings.Settings, warnings []string, err error)
 
 	// Core
-	GetPeriod() (period time.Duration, warnings []string, err error)
-	GetIPMethod() (method models.IPMethod, err error)
-	GetIPv4Method() (method models.IPMethod, err error)
-	GetIPv6Method() (method models.IPMethod, err error)
-	GetHTTPTimeout() (duration time.Duration, err error)
+	Period() (period time.Duration, warnings []string, err error)
+	IPMethod() (providers []http.Provider, err error)
+	IPv4Method() (providers []http.Provider, err error)
+	IPv6Method() (providers []http.Provider, err error)
+	HTTPTimeout() (duration time.Duration, err error)
+	CooldownPeriod() (duration time.Duration, err error)
 
 	// File paths
-	GetExeDir() (dir string, err error)
-	GetDataDir(currentDir string) (string, error)
+	ExeDir() (dir string, err error)
+	DataDir(currentDir string) (string, error)
 
 	// Web UI
-	GetListeningPort() (listeningPort, warning string, err error)
-	GetRootURL() (rootURL string, err error)
+	ListeningPort() (listeningPort uint16, warning string, err error)
+	RootURL() (rootURL string, err error)
 
 	// Backup
-	GetBackupPeriod() (duration time.Duration, err error)
-	GetBackupDirectory() (directory string, err error)
+	BackupPeriod() (duration time.Duration, err error)
+	BackupDirectory() (directory string, err error)
 
 	// Other
-	GetLoggerConfig() (encoding logging.Encoding, level logging.Level, nodeID int, err error)
-	GetGotifyURL() (URL *url.URL, err error)
-	GetGotifyToken() (token string, err error)
-
-	// Version getters
-	GetVersion() string
-	GetBuildDate() string
-	GetVcsRef() string
+	LoggerConfig() (level logging.Level, caller logging.Caller, err error)
+	GotifyURL() (URL *url.URL, err error)
+	GotifyToken() (token string, err error)
 }
 
 type reader struct {
-	envParams libparams.EnvParams
-	verifier  verification.Verifier
-	readFile  func(filename string) ([]byte, error)
+	env      params.Env
+	os       params.OS
+	readFile func(filename string) ([]byte, error)
 }
 
 func NewReader(logger logging.Logger) Reader {
 	return &reader{
-		envParams: libparams.NewEnvParams(),
-		verifier:  verification.NewVerifier(),
-		readFile:  ioutil.ReadFile,
+		env:      params.NewEnv(),
+		os:       params.NewOS(),
+		readFile: ioutil.ReadFile,
 	}
 }
 
 // GetDataDir obtains the data directory from the environment
-// variable DATADIR
-func (r *reader) GetDataDir(currentDir string) (string, error) {
-	return r.envParams.GetEnv("DATADIR", libparams.Default(currentDir+"/data"))
+// variable DATADIR.
+func (r *reader) DataDir(currentDir string) (string, error) {
+	return r.env.Get("DATADIR", params.Default(currentDir+"/data"))
 }
 
-func (r *reader) GetListeningPort() (listeningPort, warning string, err error) {
-	return r.envParams.GetListeningPort()
+func (r *reader) ListeningPort() (listeningPort uint16, warning string, err error) {
+	return r.env.ListeningPort("LISTENING_PORT", params.Default("8000"))
 }
 
-func (r *reader) GetLoggerConfig() (encoding logging.Encoding, level logging.Level, nodeID int, err error) {
-	return r.envParams.GetLoggerConfig()
+func (r *reader) LoggerConfig() (level logging.Level, caller logging.Caller, err error) {
+	caller, err = r.env.LogCaller("LOG_CALLER", params.Default("hidden"))
+	if err != nil {
+		return level, caller, err
+	}
+
+	level, err = r.env.LogLevel("LOG_LEVEL", params.Default("info"))
+	if err != nil {
+		return level, caller, err
+	}
+
+	return level, caller, nil
 }
 
-func (r *reader) GetGotifyURL() (url *url.URL, err error) {
-	return r.envParams.GetGotifyURL()
+func (r *reader) GotifyURL() (url *url.URL, err error) {
+	return r.env.URL("GOTIFY_URL")
 }
 
-func (r *reader) GetGotifyToken() (token string, err error) {
-	return r.envParams.GetGotifyToken()
+func (r *reader) GotifyToken() (token string, err error) {
+	return r.env.Get("GOTIFY_TOKEN",
+		params.CaseSensitiveValue(),
+		params.Compulsory(),
+		params.Unset())
 }
 
-func (r *reader) GetRootURL() (rootURL string, err error) {
-	return r.envParams.GetRootURL()
+func (r *reader) RootURL() (rootURL string, err error) {
+	return r.env.RootURL("ROOT_URL")
 }
 
-func (r *reader) GetPeriod() (period time.Duration, warnings []string, err error) {
+func (r *reader) Period() (period time.Duration, warnings []string, err error) {
 	// Backward compatibility
-	n, err := r.envParams.GetEnvInt("DELAY", libparams.Compulsory())
+	n, err := r.env.Int("DELAY", params.Compulsory())
 	if err == nil { // integer only, treated as seconds
 		return time.Duration(n) * time.Second,
 			[]string{
 				"the environment variable DELAY should be changed to PERIOD",
-				fmt.Sprintf("the value for the duration period of the updater does not have a time unit, you might want to set it to \"%ds\" instead of \"%d\"", n, n),
+				fmt.Sprintf(`the value for the duration period of the updater does not have a time unit, you might want to set it to "%ds" instead of "%d"`, n, n), //nolint:lll
 			}, nil
 	}
-	period, err = r.envParams.GetDuration("DELAY", libparams.Compulsory())
+	period, err = r.env.Duration("DELAY", params.Compulsory())
 	if err == nil {
 		return period,
 			[]string{
 				"the environment variable DELAY should be changed to PERIOD",
 			}, nil
 	}
-	period, err = r.envParams.GetDuration("PERIOD", libparams.Default("10m"))
+	period, err = r.env.Duration("PERIOD", params.Default("10m"))
 	return period, nil, err
 }
 
-func (r *reader) GetIPMethod() (method models.IPMethod, err error) {
-	s, err := r.envParams.GetEnv("IP_METHOD", params.Default("cycle"))
+var (
+	ErrIPMethodInvalid = errors.New("ip method is not valid")
+	ErrIPMethodVersion = errors.New("ip method not valid for IP version")
+)
+
+// IPMethod obtains the HTTP method for IP v4 or v6 to obtain your public IP address.
+func (r *reader) IPMethod() (providers []http.Provider, err error) {
+	return r.httpIPMethod("IP_METHOD", ipversion.IP4or6)
+}
+
+// IPMethod obtains the HTTP method for IP v4 to obtain your public IP address.
+func (r *reader) IPv4Method() (providers []http.Provider, err error) {
+	return r.httpIPMethod("IPV4_METHOD", ipversion.IP4)
+}
+
+// IPMethod obtains the HTTP method for IP v6 to obtain your public IP address.
+func (r *reader) IPv6Method() (providers []http.Provider, err error) {
+	return r.httpIPMethod("IPV6_METHOD", ipversion.IP6)
+}
+
+func (r *reader) httpIPMethod(envKey string, version ipversion.IPVersion) (
+	providers []http.Provider, err error) {
+	s, err := r.env.Get(envKey, params.Default("cycle"))
 	if err != nil {
-		return method, err
+		return nil, err
 	}
-	for _, choice := range constants.IPMethods() {
-		if choice.Name == s {
-			return choice, nil
+
+	availableProviders := http.ListProvidersForVersion(version)
+	choices := make(map[http.Provider]struct{}, len(availableProviders))
+	for _, provider := range availableProviders {
+		choices[provider] = struct{}{}
+	}
+
+	fields := strings.Split(s, ",")
+
+	for _, field := range fields {
+		// Retro-compatibility.
+		switch field {
+		case "ipify6":
+			field = "ipify"
+		case "noip4", "noip6", "noip8245_4", "noip8245_6":
+			field = "noip"
+		case "cycle":
+			field = "all"
 		}
-	}
-	url, err := url.Parse(s)
-	if err != nil || url == nil || url.Scheme != https {
-		return method, fmt.Errorf("ip method %q is not valid", s)
-	}
-	return models.IPMethod{
-		Name: s,
-		URL:  s,
-		IPv4: true,
-		IPv6: true,
-	}, nil
-}
 
-func (r *reader) GetIPv4Method() (method models.IPMethod, err error) {
-	s, err := r.envParams.GetEnv("IPV4_METHOD", params.Default("cycle"))
-	if err != nil {
-		return method, err
-	}
-	for _, choice := range constants.IPMethods() {
-		if choice.Name == s {
-			if s != "cycle" && !choice.IPv4 {
-				return method, fmt.Errorf("ip method %s does not support IPv4", s)
-			}
-			return choice, nil
+		if field == "all" {
+			return availableProviders, nil
 		}
-	}
-	url, err := url.Parse(s)
-	if err != nil || url == nil || url.Scheme != https {
-		return method, fmt.Errorf("ipv4 method %q is not valid", s)
-	}
-	return models.IPMethod{
-		Name: s,
-		URL:  s,
-		IPv4: true,
-	}, nil
-}
 
-func (r *reader) GetIPv6Method() (method models.IPMethod, err error) {
-	s, err := r.envParams.GetEnv("IPV6_METHOD", params.Default("cycle"))
-	if err != nil {
-		return method, err
-	}
-	for _, choice := range constants.IPMethods() {
-		if choice.Name == s {
-			if s != "cycle" && !choice.IPv6 {
-				return method, fmt.Errorf("ip method %s does not support IPv6", s)
-			}
-			return choice, nil
+		// Custom URL check
+		url, err := url.Parse(field)
+		if err == nil && url != nil && url.Scheme == "https" {
+			providers = append(providers, http.CustomProvider(url))
+			continue
 		}
+
+		provider := http.Provider(field)
+		if _, ok := choices[provider]; !ok {
+			return nil, fmt.Errorf("%w: %s", ErrIPMethodInvalid, provider)
+		}
+		providers = append(providers, provider)
 	}
-	url, err := url.Parse(s)
-	if err != nil || url == nil || url.Scheme != https {
-		return method, fmt.Errorf("ipv6 method %q is not valid", s)
+
+	if len(providers) == 0 {
+		return nil, fmt.Errorf("%w: %s", ErrIPMethodVersion, version)
 	}
-	return models.IPMethod{
-		Name: s,
-		URL:  s,
-		IPv6: true,
-	}, nil
+
+	return providers, nil
 }
 
-func (r *reader) GetExeDir() (dir string, err error) {
-	return r.envParams.GetExeDir()
+func (r *reader) ExeDir() (dir string, err error) {
+	return r.os.ExeDir()
 }
 
-func (r *reader) GetHTTPTimeout() (duration time.Duration, err error) {
-	return r.envParams.GetHTTPTimeout(libparams.Default("10s"))
+func (r *reader) HTTPTimeout() (duration time.Duration, err error) {
+	return r.env.Duration("HTTP_TIMEOUT", params.Default("10s"))
 }
 
-func (r *reader) GetBackupPeriod() (duration time.Duration, err error) {
-	s, err := r.envParams.GetEnv("BACKUP_PERIOD", libparams.Default("0"))
+func (r *reader) BackupPeriod() (duration time.Duration, err error) {
+	s, err := r.env.Get("BACKUP_PERIOD", params.Default("0"))
 	if err != nil {
 		return 0, err
 	}
 	return time.ParseDuration(s)
 }
 
-func (r *reader) GetBackupDirectory() (directory string, err error) {
-	return r.envParams.GetEnv("BACKUP_DIRECTORY", libparams.Default("./data"))
+func (r *reader) BackupDirectory() (directory string, err error) {
+	return r.env.Path("BACKUP_DIRECTORY", params.Default("./data"))
+}
+
+func (r *reader) CooldownPeriod() (duration time.Duration, err error) {
+	return r.env.Duration("UPDATE_COOLDOWN_PERIOD", params.Default("5m"))
 }

internal/params/version.go

@@ -1,20 +0,0 @@
-package params
-
-import (
-	libparams "github.com/qdm12/golibs/params"
-)
-
-func (r *reader) GetVersion() string {
-	version, _ := r.envParams.GetEnv("VERSION", libparams.Default("?"), libparams.CaseSensitiveValue())
-	return version
-}
-
-func (r *reader) GetBuildDate() string {
-	buildDate, _ := r.envParams.GetEnv("BUILD_DATE", libparams.Default("?"), libparams.CaseSensitiveValue())
-	return buildDate
-}
-
-func (r *reader) GetVcsRef() string {
-	buildDate, _ := r.envParams.GetEnv("VCS_REF", libparams.Default("?"), libparams.CaseSensitiveValue())
-	return buildDate
-}

internal/persistence/json/database.go

@@ -51,7 +51,7 @@ func NewDatabase(dataDir string) (*Database, error) {
 		return nil, err
 	}
 	if err := db.Check(); err != nil {
-		return nil, err
+		return nil, fmt.Errorf("%s validation error: %w", db.filepath, err)
 	}
 	return &db, nil
 }

internal/persistence/json/queries.go

@@ -32,7 +32,7 @@ func (db *Database) StoreNewIP(domain, host string, ip net.IP, t time.Time) (err
 }
 
 // GetEvents gets all the IP addresses history for a certain domain and host, in the order
-// from oldest to newest
+// from oldest to newest.
 func (db *Database) GetEvents(domain, host string) (events []models.HistoryEvent, err error) {
 	db.RLock()
 	defer db.RUnlock()
@@ -44,7 +44,7 @@ func (db *Database) GetEvents(domain, host string) (events []models.HistoryEvent
 	return nil, nil
 }
 
-// GetAllDomainsHosts gets all the domains and hosts from the database
+// GetAllDomainsHosts gets all the domains and hosts from the database.
 func (db *Database) GetAllDomainsHosts() (domainshosts []models.DomainHost, err error) {
 	db.RLock()
 	defer db.RUnlock()

internal/records/records.go

@@ -9,16 +9,17 @@ import (
 	"github.com/qdm12/ddns-updater/internal/settings"
 )
 
-// Record contains all the information to update and display a DNS record
+// Record contains all the information to update and display a DNS record.
 type Record struct { // internal
 	Settings settings.Settings // fixed
 	History  models.History    // past information
 	Status   models.Status
 	Message  string
 	Time     time.Time
+	LastBan  *time.Time // nil means no last ban
 }
 
-// New returns a new Record with settings and some history
+// New returns a new Record with settings and some history.
 func New(settings settings.Settings, events []models.HistoryEvent) Record {
 	return Record{
 		Settings: settings,
@@ -32,5 +33,6 @@ func (r *Record) String() string {
 	if len(r.Message) > 0 {
 		status += " (" + r.Message + ")"
 	}
-	return fmt.Sprintf("%s: %s %s; %s", r.Settings.String(), status, r.Time.Format("2006-01-02 15:04:05 MST"), r.History.String())
+	return fmt.Sprintf("%s: %s %s; %s",
+		r.Settings, status, r.Time.Format("2006-01-02 15:04:05 MST"), r.History)
 }

internal/regex/regex.go

@@ -3,27 +3,29 @@ package regex
 import "regexp"
 
 type Matcher interface {
+	GandiKey(s string) bool
 	GodaddyKey(s string) bool
-	GodaddySecret(s string) bool
 	DuckDNSToken(s string) bool
 	NamecheapPassword(s string) bool
 	DreamhostKey(s string) bool
 	CloudflareKey(s string) bool
 	CloudflareUserServiceKey(s string) bool
+	DNSOMaticUsername(s string) bool
+	DNSOMaticPassword(s string) bool
 }
 
 type matcher struct {
-	goDaddyKey, goDaddySecret, duckDNSToken, namecheapPassword, dreamhostKey, cloudflareKey, cloudflareUserServiceKey *regexp.Regexp
+	goDaddyKey, duckDNSToken, namecheapPassword, dreamhostKey, cloudflareKey,
+	cloudflareUserServiceKey, dnsOMaticUsername, dnsOMaticPassword, gandiKey *regexp.Regexp
 }
 
-//nolint:gocritic
 func NewMatcher() (m Matcher, err error) {
 	matcher := &matcher{}
-	matcher.goDaddyKey, err = regexp.Compile(`^[A-Za-z0-9]{10,14}\_[A-Za-z0-9]{22}$`)
+	matcher.gandiKey, err = regexp.Compile(`^[A-Za-z0-9]{24}$`)
 	if err != nil {
 		return nil, err
 	}
-	matcher.goDaddySecret, err = regexp.Compile(`^[A-Za-z0-9]{22}$`)
+	matcher.goDaddyKey, err = regexp.Compile(`^[A-Za-z0-9]{8,14}\_[A-Za-z0-9]{21,22}$`)
 	if err != nil {
 		return nil, err
 	}
@@ -47,11 +49,19 @@ func NewMatcher() (m Matcher, err error) {
 	if err != nil {
 		return nil, err
 	}
+	matcher.dnsOMaticUsername, err = regexp.Compile(`^[a-zA-Z0-9._-]{3,25}$`)
+	if err != nil {
+		return nil, err
+	}
+	matcher.dnsOMaticPassword, err = regexp.Compile(`^[a-zA-Z0-9][a-zA-Z0-9._-]{5,19}$`)
+	if err != nil {
+		return nil, err
+	}
 	return matcher, nil
 }
 
+func (m *matcher) GandiKey(s string) bool          { return m.gandiKey.MatchString(s) }
 func (m *matcher) GodaddyKey(s string) bool        { return m.goDaddyKey.MatchString(s) }
-func (m *matcher) GodaddySecret(s string) bool     { return m.goDaddySecret.MatchString(s) }
 func (m *matcher) DuckDNSToken(s string) bool      { return m.duckDNSToken.MatchString(s) }
 func (m *matcher) NamecheapPassword(s string) bool { return m.namecheapPassword.MatchString(s) }
 func (m *matcher) DreamhostKey(s string) bool      { return m.dreamhostKey.MatchString(s) }
@@ -59,3 +69,5 @@ func (m *matcher) CloudflareKey(s string) bool     { return m.cloudflareKey.Matc
 func (m *matcher) CloudflareUserServiceKey(s string) bool {
 	return m.cloudflareUserServiceKey.MatchString(s)
 }
+func (m *matcher) DNSOMaticUsername(s string) bool { return m.dnsOMaticUsername.MatchString(s) }
+func (m *matcher) DNSOMaticPassword(s string) bool { return m.dnsOMaticPassword.MatchString(s) }

internal/server/error.go

@@ -0,0 +1,35 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type errJSONWrapper struct {
+	Error string `json:"error"`
+}
+
+func httpError(w http.ResponseWriter, status int, errString string) {
+	w.WriteHeader(status)
+	if errString == "" {
+		errString = http.StatusText(status)
+	}
+	body := errJSONWrapper{Error: errString}
+	_ = json.NewEncoder(w).Encode(body)
+}
+
+type errorsJSONWrapper struct {
+	Errors []string `json:"errors"`
+}
+
+func httpErrors(w http.ResponseWriter, status int, errors []error) {
+	w.WriteHeader(status)
+
+	errs := make([]string, len(errors))
+	for i := range errors {
+		errs[i] = errors[i].Error()
+	}
+
+	body := errorsJSONWrapper{Errors: errs}
+	_ = json.NewEncoder(w).Encode(body)
+}

internal/server/fileserver.go

@@ -0,0 +1,24 @@
+package server
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/go-chi/chi"
+)
+
+func fileServer(router chi.Router, path string, root http.FileSystem) {
+	if path != "/" && path[len(path)-1] != '/' {
+		router.Get(path,
+			http.RedirectHandler(path+"/", http.StatusMovedPermanently).ServeHTTP)
+		path += "/"
+	}
+	path += "*"
+
+	router.Get(path, func(w http.ResponseWriter, r *http.Request) {
+		rctx := chi.RouteContext(r.Context())
+		pathPrefix := strings.TrimSuffix(rctx.RoutePattern(), "/*")
+		fs := http.StripPrefix(pathPrefix, http.FileServer(root))
+		fs.ServeHTTP(w, r)
+	})
+}

internal/server/handler.go

@@ -0,0 +1,50 @@
+package server
+
+import (
+	"context"
+	"net/http"
+	"text/template"
+	"time"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+	"github.com/qdm12/ddns-updater/internal/data"
+	"github.com/qdm12/ddns-updater/internal/update"
+)
+
+type handlers struct {
+	ctx context.Context
+	// Objects
+	db            data.Database
+	runner        update.Runner
+	indexTemplate *template.Template
+	// Mockable functions
+	timeNow func() time.Time
+}
+
+func newHandler(ctx context.Context, rootURL, uiDir string,
+	db data.Database, runner update.Runner) http.Handler {
+	indexTemplate := template.Must(template.ParseFiles(uiDir + "/index.html"))
+
+	handlers := &handlers{
+		ctx:           ctx,
+		db:            db,
+		indexTemplate: indexTemplate,
+		// TODO build information
+		timeNow: time.Now,
+		runner:  runner,
+	}
+
+	router := chi.NewRouter()
+
+	router.Use(middleware.Logger, middleware.CleanPath)
+
+	router.Get(rootURL+"/", handlers.index)
+
+	router.Get(rootURL+"/update", handlers.update)
+
+	// UI file server for other paths
+	fileServer(router, rootURL+"/", http.Dir(uiDir))
+
+	return router
+}

internal/server/index.go

@@ -0,0 +1,18 @@
+package server
+
+import (
+	"net/http"
+
+	"github.com/qdm12/ddns-updater/internal/models"
+)
+
+func (h *handlers) index(w http.ResponseWriter, r *http.Request) {
+	var htmlData models.HTMLData
+	for _, record := range h.db.SelectAll() {
+		row := record.HTML(h.timeNow())
+		htmlData.Rows = append(htmlData.Rows, row)
+	}
+	if err := h.indexTemplate.ExecuteTemplate(w, "index.html", htmlData); err != nil {
+		httpError(w, http.StatusInternalServerError, "failed generating webpage: "+err.Error())
+	}
+}

internal/server/server.go

@@ -0,0 +1,56 @@
+package server
+
+import (
+	"context"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/qdm12/ddns-updater/internal/data"
+	"github.com/qdm12/ddns-updater/internal/update"
+	"github.com/qdm12/golibs/logging"
+)
+
+type Server interface {
+	Run(ctx context.Context, wg *sync.WaitGroup)
+}
+
+type server struct {
+	address string
+	logger  logging.Logger
+	handler http.Handler
+}
+
+func New(ctx context.Context, address, rootURL, uiDir string, db data.Database, logger logging.Logger,
+	runner update.Runner) Server {
+	handler := newHandler(ctx, rootURL, uiDir, db, runner)
+	return &server{
+		address: address,
+		logger:  logger,
+		handler: handler,
+	}
+}
+
+func (s *server) Run(ctx context.Context, wg *sync.WaitGroup) {
+	defer wg.Done()
+	server := http.Server{Addr: s.address, Handler: s.handler}
+	go func() {
+		<-ctx.Done()
+		s.logger.Warn("shutting down (context canceled)")
+		defer s.logger.Warn("shut down")
+		const shutdownGraceDuration = 2 * time.Second
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGraceDuration)
+		defer cancel()
+		if err := server.Shutdown(shutdownCtx); err != nil {
+			s.logger.Error("failed shutting down: %s", err)
+		}
+	}()
+	for ctx.Err() == nil {
+		s.logger.Info("listening on %s", s.address)
+		err := server.ListenAndServe()
+		if err != nil && ctx.Err() == nil { // server crashed
+			s.logger.Error(err)
+			s.logger.Info("restarting")
+		}
+	}
+}

internal/server/update.go

@@ -0,0 +1,18 @@
+package server
+
+import (
+	"net/http"
+)
+
+func (h *handlers) update(w http.ResponseWriter, r *http.Request) {
+	start := h.timeNow()
+	errors := h.runner.ForceUpdate(h.ctx)
+	duration := h.timeNow().Sub(start)
+	if len(errors) > 0 {
+		httpErrors(w, http.StatusInternalServerError, errors)
+		return
+	}
+	w.WriteHeader(http.StatusAccepted)
+	message := "All records updated successfully in " + duration.String()
+	_, _ = w.Write([]byte(message))
+}

internal/settings/cloudflare.go

@@ -1,6 +1,8 @@
 package settings
 
 import (
+	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"net"
@@ -10,18 +12,15 @@ import (
 
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
-	"github.com/qdm12/ddns-updater/internal/network"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	netlib "github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 	"github.com/qdm12/golibs/verification"
 )
 
-//nolint:maligned
 type cloudflare struct {
 	domain         string
 	host           string
-	ipVersion      models.IPVersion
-	dnsLookup      bool
+	ipVersion      ipversion.IPVersion
 	key            string
 	token          string
 	email          string
@@ -32,7 +31,8 @@ type cloudflare struct {
 	matcher        regex.Matcher
 }
 
-func NewCloudflare(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewCloudflare(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	matcher regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Key            string `json:"key"`
 		Token          string `json:"token"`
@@ -49,7 +49,6 @@ func NewCloudflare(data json.RawMessage, domain, host string, ipVersion models.I
 		domain:         domain,
 		host:           host,
 		ipVersion:      ipVersion,
-		dnsLookup:      !noDNSLookup,
 		key:            extraSettings.Key,
 		token:          extraSettings.Token,
 		email:          extraSettings.Email,
@@ -70,21 +69,21 @@ func (c *cloudflare) isValid() error {
 	case len(c.key) > 0: // email and key must be provided
 		switch {
 		case !c.matcher.CloudflareKey(c.key):
-			return fmt.Errorf("invalid key format")
+			return ErrMalformedKey
 		case !verification.NewVerifier().MatchEmail(c.email):
-			return fmt.Errorf("invalid email format")
+			return ErrMalformedEmail
 		}
 	case len(c.userServiceKey) > 0: // only user service key
 		if !c.matcher.CloudflareKey(c.key) {
-			return fmt.Errorf("invalid user service key format")
+			return ErrMalformedUserServiceKey
 		}
 	default: // API token only
 	}
 	switch {
 	case len(c.zoneIdentifier) == 0:
-		return fmt.Errorf("zone identifier cannot be empty")
+		return ErrEmptyZoneIdentifier
 	case c.ttl == 0:
-		return fmt.Errorf("TTL cannot be left to 0")
+		return ErrEmptyTTL
 	}
 	return nil
 }
@@ -101,12 +100,12 @@ func (c *cloudflare) Host() string {
 	return c.host
 }
 
-func (c *cloudflare) IPVersion() models.IPVersion {
+func (c *cloudflare) IPVersion() ipversion.IPVersion {
 	return c.ipVersion
 }
 
-func (c *cloudflare) DNSLookup() bool {
-	return c.dnsLookup
+func (c *cloudflare) Proxied() bool {
+	return c.proxied
 }
 
 func (c *cloudflare) BuildDomainName() string {
@@ -122,26 +121,30 @@ func (c *cloudflare) HTML() models.HTMLRow {
 	}
 }
 
-func setHeaders(r *http.Request, token, userServiceKey, email, key string) {
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
+func (c *cloudflare) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setContentType(request, "application/json")
+	setAccept(request, "application/json")
 	switch {
-	case len(token) > 0:
-		r.Header.Set("Authorization", "Bearer "+token)
-	case len(userServiceKey) > 0:
-		r.Header.Set("X-Auth-User-Service-Key", userServiceKey)
-	case len(email) > 0 && len(key) > 0:
-		r.Header.Set("X-Auth-Email", email)
-		r.Header.Set("X-Auth-Key", key)
+	case len(c.token) > 0:
+		setAuthBearer(request, c.token)
+	case len(c.userServiceKey) > 0:
+		request.Header.Set("X-Auth-User-Service-Key", c.userServiceKey)
+	case len(c.email) > 0 && len(c.key) > 0:
+		request.Header.Set("X-Auth-Email", c.email)
+		request.Header.Set("X-Auth-Key", c.key)
 	}
 }
 
-// Obtain domain identifier
-// See https://api.cloudflare.com/#dns-records-for-a-zone-list-dns-records
-func (c *cloudflare) getRecordIdentifier(client netlib.Client, newIP net.IP) (identifier string, upToDate bool, err error) {
+// Obtain domain ID.
+// See https://api.cloudflare.com/#dns-records-for-a-zone-list-dns-records.
+func (c *cloudflare) getRecordID(ctx context.Context, client *http.Client, newIP net.IP) (
+	identifier string, upToDate bool, err error) {
 	recordType := A
 	if newIP.To4() == nil {
 		recordType = AAAA
 	}
+
 	u := url.URL{
 		Scheme: "https",
 		Host:   "api.cloudflare.com",
@@ -153,17 +156,25 @@ func (c *cloudflare) getRecordIdentifier(client netlib.Client, newIP net.IP) (id
 	values.Set("page", "1")
 	values.Set("per_page", "1")
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return "", false, err
 	}
-	setHeaders(r, c.token, c.userServiceKey, c.email, c.key)
-	status, content, err := client.DoHTTPRequest(r)
+	c.setHeaders(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return "", false, err
-	} else if status != http.StatusOK {
-		return "", false, fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return "", false, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
 	listRecordsResponse := struct {
 		Success bool     `json:"success"`
 		Errors  []string `json:"errors"`
@@ -172,67 +183,84 @@ func (c *cloudflare) getRecordIdentifier(client netlib.Client, newIP net.IP) (id
 			Content string `json:"content"`
 		} `json:"result"`
 	}{}
-	if err := json.Unmarshal(content, &listRecordsResponse); err != nil {
-		return "", false, err
+	if err := decoder.Decode(&listRecordsResponse); err != nil {
+		return "", false, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
 	}
+
 	switch {
 	case len(listRecordsResponse.Errors) > 0:
-		return "", false, fmt.Errorf(strings.Join(listRecordsResponse.Errors, ","))
+		return "", false, fmt.Errorf("%w: %s",
+			ErrUnsuccessfulResponse, strings.Join(listRecordsResponse.Errors, ","))
 	case !listRecordsResponse.Success:
-		return "", false, fmt.Errorf("request to Cloudflare not successful")
+		return "", false, ErrUnsuccessfulResponse
 	case len(listRecordsResponse.Result) == 0:
-		return "", false, fmt.Errorf("received no result from Cloudflare")
+		return "", false, ErrNoResultReceived
 	case len(listRecordsResponse.Result) > 1:
-		return "", false, fmt.Errorf("received %d results instead of 1 from Cloudflare", len(listRecordsResponse.Result))
+		return "", false, fmt.Errorf("%w: %d instead of 1",
+			ErrNumberOfResultsReceived, len(listRecordsResponse.Result))
 	case listRecordsResponse.Result[0].Content == newIP.String(): // up to date
 		return "", true, nil
 	}
 	return listRecordsResponse.Result[0].ID, false, nil
 }
 
-func (c *cloudflare) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
+func (c *cloudflare) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	recordType := A
 	if ip.To4() == nil {
 		recordType = AAAA
 	}
-	identifier, upToDate, err := c.getRecordIdentifier(client, ip)
+	identifier, upToDate, err := c.getRecordID(ctx, client, ip)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("%s: %w", ErrGetRecordID, err)
 	} else if upToDate {
 		return ip, nil
 	}
-	type cloudflarePutBody struct {
-		Type    string `json:"type"`    // A or AAAA depending on ip address given
-		Name    string `json:"name"`    // DNS record name i.e. example.com
-		Content string `json:"content"` // ip address
-		Proxied bool   `json:"proxied"` // whether the record is receiving the performance and security benefits of Cloudflare
-		TTL     uint   `json:"ttl"`
-	}
+
 	u := url.URL{
 		Scheme: "https",
 		Host:   "api.cloudflare.com",
 		Path:   fmt.Sprintf("/client/v4/zones/%s/dns_records/%s", c.zoneIdentifier, identifier),
 	}
-	r, err := network.BuildHTTPPut(
-		u.String(),
-		cloudflarePutBody{
-			Type:    recordType,
-			Name:    c.host,
-			Content: ip.String(),
-			Proxied: c.proxied,
-			TTL:     c.ttl,
-		},
-	)
+
+	requestData := struct {
+		Type    string `json:"type"`    // A or AAAA depending on ip address given
+		Name    string `json:"name"`    // DNS record name i.e. example.com
+		Content string `json:"content"` // ip address
+		Proxied bool   `json:"proxied"` // whether the record is receiving the performance and security benefits of Cloudflare
+		TTL     uint   `json:"ttl"`
+	}{
+		Type:    recordType,
+		Name:    c.BuildDomainName(),
+		Content: ip.String(),
+		Proxied: c.proxied,
+		TTL:     c.ttl,
+	}
+
+	buffer := bytes.NewBuffer(nil)
+	encoder := json.NewEncoder(buffer)
+	if err := encoder.Encode(requestData); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrRequestEncode, err)
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPut, u.String(), buffer)
 	if err != nil {
 		return nil, err
 	}
-	setHeaders(r, c.token, c.userServiceKey, c.email, c.key)
-	status, content, err := client.DoHTTPRequest(r)
+
+	c.setHeaders(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status > http.StatusUnsupportedMediaType {
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode > http.StatusUnsupportedMediaType {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
 	var parsedJSON struct {
 		Success bool `json:"success"`
 		Errors  []struct {
@@ -243,20 +271,23 @@ func (c *cloudflare) Update(client netlib.Client, ip net.IP) (newIP net.IP, err
 			Content string `json:"content"`
 		} `json:"result"`
 	}
-	if err := json.Unmarshal(content, &parsedJSON); err != nil {
-		return nil, err
-	} else if !parsedJSON.Success {
+	if err := decoder.Decode(&parsedJSON); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if !parsedJSON.Success {
 		var errStr string
 		for _, e := range parsedJSON.Errors {
 			errStr += fmt.Sprintf("error %d: %s; ", e.Code, e.Message)
 		}
-		return nil, fmt.Errorf(errStr)
+		return nil, fmt.Errorf("%w: %s", ErrUnsuccessfulResponse, errStr)
 	}
+
 	newIP = net.ParseIP(parsedJSON.Result.Content)
 	if newIP == nil {
-		return nil, fmt.Errorf("new IP %q is malformed", parsedJSON.Result.Content)
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, parsedJSON.Result.Content)
 	} else if !newIP.Equal(ip) {
-		return nil, fmt.Errorf("new IP address %s is not %s", newIP.String(), ip.String())
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 	}
 	return newIP, nil
 }

internal/settings/constants.go

@@ -1,9 +1,13 @@
 package settings
 
 const (
-	badauth = "badauth"
-	success = "success"
-	nohost  = "nohost"
-	A       = "A"
-	AAAA    = "AAAA"
+	badauth    = "badauth"
+	success    = "success"
+	nohost     = "nohost"
+	notfqdn    = "notfqdn"
+	badagent   = "badagent"
+	abuse      = "abuse"
+	nineoneone = "911"
+	A          = "A"
+	AAAA       = "AAAA"
 )

internal/settings/ddnss.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -11,21 +13,20 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
-//nolint:maligned
 type ddnss struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	username      string
 	password      string
 	useProviderIP bool
 }
 
-func NewDdnss(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewDdnss(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Username      string `json:"username"`
 		Password      string `json:"password"`
@@ -38,7 +39,6 @@ func NewDdnss(data json.RawMessage, domain, host string, ipVersion models.IPVers
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		username:      extraSettings.Username,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
@@ -52,11 +52,11 @@ func NewDdnss(data json.RawMessage, domain, host string, ipVersion models.IPVers
 func (d *ddnss) isValid() error {
 	switch {
 	case len(d.username) == 0:
-		return fmt.Errorf("username cannot be empty")
+		return ErrEmptyUsername
 	case len(d.password) == 0:
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	case d.host == "*":
-		return fmt.Errorf(`host cannot be "*"`)
+		return ErrHostWildcard
 	}
 	return nil
 }
@@ -73,12 +73,12 @@ func (d *ddnss) Host() string {
 	return d.host
 }
 
-func (d *ddnss) IPVersion() models.IPVersion {
+func (d *ddnss) IPVersion() ipversion.IPVersion {
 	return d.ipVersion
 }
 
-func (d *ddnss) DNSLookup() bool {
-	return d.dnsLookup
+func (d *ddnss) Proxied() bool {
+	return false
 }
 
 func (d *ddnss) BuildDomainName() string {
@@ -94,7 +94,7 @@ func (d *ddnss) HTML() models.HTMLRow {
 	}
 }
 
-func (d *ddnss) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (d *ddnss) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "www.ddnss.de",
@@ -103,11 +103,7 @@ func (d *ddnss) Update(client network.Client, ip net.IP) (newIP net.IP, err erro
 	values := url.Values{}
 	values.Set("user", d.username)
 	values.Set("pwd", d.password)
-	fqdn := d.domain
-	if d.host != "@" {
-		fqdn = d.host + "." + d.domain
-	}
-	values.Set("host", fqdn)
+	values.Set("host", d.BuildDomainName())
 	if !d.useProviderIP {
 		if ip.To4() == nil { // ipv6
 			values.Set("ip6", ip.String())
@@ -116,29 +112,40 @@ func (d *ddnss) Update(client network.Client, ip net.IP) (newIP net.IP, err erro
 		}
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
 	}
-	s := string(content)
-	if status != http.StatusOK {
-		return nil, fmt.Errorf("received status %d with message: %s", status, s)
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
 	}
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyDataToSingleLine(s))
+	}
+
 	switch {
 	case strings.Contains(s, "badysys"):
-		return nil, fmt.Errorf("ddnss.de: invalid system parameter")
+		return nil, ErrInvalidSystemParam
 	case strings.Contains(s, badauth):
-		return nil, fmt.Errorf("ddnss.de: bad authentication")
-	case strings.Contains(s, "notfqdn"):
-		return nil, fmt.Errorf("ddnss.de: hostname %q does not exist", fqdn)
+		return nil, ErrAuth
+	case strings.Contains(s, notfqdn):
+		return nil, ErrHostnameNotExists
 	case strings.Contains(s, "Updated 1 hostname"):
 		return ip, nil
 	default:
-		return nil, fmt.Errorf("unknown response received from ddnss.de: %s", s)
+		return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
 	}
 }

internal/settings/digitalocean.go

@@ -0,0 +1,206 @@
+package settings
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/qdm12/ddns-updater/internal/constants"
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+)
+
+type digitalOcean struct {
+	domain    string
+	host      string
+	ipVersion ipversion.IPVersion
+	token     string
+}
+
+func NewDigitalOcean(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Token string `json:"token"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	d := &digitalOcean{
+		domain:    domain,
+		host:      host,
+		ipVersion: ipVersion,
+		token:     extraSettings.Token,
+	}
+	if err := d.isValid(); err != nil {
+		return nil, err
+	}
+	return d, nil
+}
+
+func (d *digitalOcean) isValid() error {
+	if len(d.token) == 0 {
+		return ErrEmptyToken
+	}
+	return nil
+}
+
+func (d *digitalOcean) String() string {
+	return toString(d.domain, d.host, constants.DIGITALOCEAN, d.ipVersion)
+}
+
+func (d *digitalOcean) Domain() string {
+	return d.domain
+}
+
+func (d *digitalOcean) Host() string {
+	return d.host
+}
+
+func (d *digitalOcean) IPVersion() ipversion.IPVersion {
+	return d.ipVersion
+}
+
+func (d *digitalOcean) Proxied() bool {
+	return false
+}
+
+func (d *digitalOcean) BuildDomainName() string {
+	return buildDomainName(d.host, d.domain)
+}
+
+func (d *digitalOcean) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", d.BuildDomainName(), d.BuildDomainName())),
+		Host:      models.HTML(d.Host()),
+		Provider:  "<a href=\"https://www.digitalocean.com/\">DigitalOcean</a>",
+		IPVersion: models.HTML(d.ipVersion),
+	}
+}
+
+func (d *digitalOcean) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setContentType(request, "application/json")
+	setAccept(request, "application/json")
+	setAuthBearer(request, d.token)
+}
+
+func (d *digitalOcean) getRecordID(ctx context.Context, recordType string, client *http.Client) (
+	recordID int, err error) {
+	values := url.Values{}
+	values.Set("name", d.BuildDomainName())
+	values.Set("type", recordType)
+	u := url.URL{
+		Scheme:   "https",
+		Host:     "api.digitalocean.com",
+		Path:     "/v2/domains/" + d.domain + "/records",
+		RawQuery: values.Encode(),
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return 0, err
+	}
+	d.setHeaders(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return 0, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return 0, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var result struct {
+		DomainRecords []struct {
+			ID int `json:"id"`
+		} `json:"domain_records"`
+	}
+	if err = decoder.Decode(&result); err != nil {
+		return 0, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if len(result.DomainRecords) == 0 {
+		return 0, ErrNotFound
+	} else if result.DomainRecords[0].ID == 0 {
+		return 0, ErrDomainIDNotFound
+	}
+
+	return result.DomainRecords[0].ID, nil
+}
+
+func (d *digitalOcean) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	recordType := A
+	if ip.To4() == nil { // IPv6
+		recordType = AAAA
+	}
+
+	recordID, err := d.getRecordID(ctx, recordType, client)
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", ErrGetRecordID, err)
+	}
+
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.digitalocean.com",
+		Path:   fmt.Sprintf("/v2/domains/%s/records/%d", d.domain, recordID),
+	}
+
+	buffer := bytes.NewBuffer(nil)
+	encoder := json.NewEncoder(buffer)
+	requestData := struct {
+		Type string `json:"type"`
+		Name string `json:"name"`
+		Data string `json:"data"`
+	}{
+		Type: recordType,
+		Name: d.host,
+		Data: ip.String(),
+	}
+	if err := encoder.Encode(requestData); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrRequestEncode, err)
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPut, u.String(), buffer)
+	if err != nil {
+		return nil, err
+	}
+	d.setHeaders(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var responseData struct {
+		DomainRecord struct {
+			Data string `json:"data"`
+		} `json:"domain_record"`
+	}
+	if err := decoder.Decode(&responseData); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	newIP = net.ParseIP(responseData.DomainRecord.Data)
+	if newIP == nil {
+		return nil, fmt.Errorf("IP address received %q is malformed", responseData.DomainRecord.Data)
+	} else if !newIP.Equal(ip) {
+		return nil, fmt.Errorf("updated IP address %s is not the IP address %s sent for update", newIP, ip)
+	}
+	return newIP, nil
+}

internal/settings/dnsomatic.go

@@ -0,0 +1,175 @@
+package settings
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/qdm12/ddns-updater/internal/constants"
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+	"github.com/qdm12/golibs/verification"
+)
+
+type dnsomatic struct {
+	domain        string
+	host          string
+	ipVersion     ipversion.IPVersion
+	username      string
+	password      string
+	useProviderIP bool
+	matcher       regex.Matcher
+}
+
+func NewDNSOMatic(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	matcher regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Username      string `json:"username"`
+		Password      string `json:"password"`
+		UseProviderIP bool   `json:"provider_ip"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	d := &dnsomatic{
+		domain:        domain,
+		host:          host,
+		ipVersion:     ipVersion,
+		username:      extraSettings.Username,
+		password:      extraSettings.Password,
+		useProviderIP: extraSettings.UseProviderIP,
+		matcher:       matcher,
+	}
+	if err := d.isValid(); err != nil {
+		return nil, err
+	}
+	return d, nil
+}
+
+func (d *dnsomatic) isValid() error {
+	switch {
+	case !d.matcher.DNSOMaticUsername(d.username):
+		return fmt.Errorf("%w: %s", ErrMalformedUsername, d.username)
+	case !d.matcher.DNSOMaticPassword(d.password):
+		return ErrMalformedPassword
+	case len(d.username) == 0:
+		return ErrEmptyUsername
+	case len(d.password) == 0:
+		return ErrEmptyPassword
+	}
+	return nil
+}
+
+func (d *dnsomatic) String() string {
+	return toString(d.domain, d.host, constants.DNSOMATIC, d.ipVersion)
+}
+
+func (d *dnsomatic) Domain() string {
+	return d.domain
+}
+
+func (d *dnsomatic) Host() string {
+	return d.host
+}
+
+func (d *dnsomatic) IPVersion() ipversion.IPVersion {
+	return d.ipVersion
+}
+
+func (d *dnsomatic) Proxied() bool {
+	return false
+}
+
+func (d *dnsomatic) BuildDomainName() string {
+	return buildDomainName(d.host, d.domain)
+}
+
+func (d *dnsomatic) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", d.BuildDomainName(), d.BuildDomainName())),
+		Host:      models.HTML(d.Host()),
+		Provider:  "<a href=\"https://www.dnsomatic.com/\">dnsomatic</a>",
+		IPVersion: models.HTML(d.ipVersion),
+	}
+}
+
+func (d *dnsomatic) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	// Multiple hosts can be updated in one query, see https://www.dnsomatic.com/docs/api
+	u := url.URL{
+		Scheme: "https",
+		Host:   "updates.dnsomatic.com",
+		Path:   "/nic/update",
+		User:   url.UserPassword(d.username, d.password),
+	}
+	values := url.Values{}
+	values.Set("hostname", d.BuildDomainName())
+	if !d.useProviderIP {
+		values.Set("myip", ip.String())
+	}
+	values.Set("wildcard", "NOCHG")
+	if d.host == "*" {
+		values.Set("wildcard", "ON")
+	}
+	values.Set("mx", "NOCHG")
+	values.Set("backmx", "NOCHG")
+	u.RawQuery = values.Encode()
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	setUserAgent(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, s)
+	}
+
+	switch s {
+	case nohost, notfqdn:
+		return nil, ErrHostnameNotExists
+	case badauth:
+		return nil, ErrAuth
+	case badagent:
+		return nil, ErrBannedUserAgent
+	case abuse:
+		return nil, ErrAbuse
+	case "dnserr", nineoneone:
+		return nil, fmt.Errorf("%w: %s", ErrDNSServerSide, s)
+	}
+	if strings.Contains(s, "nochg") || strings.Contains(s, "good") {
+		ipsV4 := verification.NewVerifier().SearchIPv4(s)
+		ipsV6 := verification.NewVerifier().SearchIPv6(s)
+		ips := append(ipsV4, ipsV6...)
+		if ips == nil {
+			return nil, fmt.Errorf("no IP address in response")
+		}
+		newIP = net.ParseIP(ips[0])
+		if newIP == nil {
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ips[0])
+		}
+		if !d.useProviderIP && !ip.Equal(newIP) {
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
+		}
+		return newIP, nil
+	}
+	return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
+}

internal/settings/dnspod.go

@@ -2,6 +2,7 @@ package settings
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"net"
@@ -11,18 +12,18 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
 type dnspod struct {
 	domain    string
 	host      string
-	ipVersion models.IPVersion
-	dnsLookup bool
+	ipVersion ipversion.IPVersion
 	token     string
 }
 
-func NewDNSPod(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewDNSPod(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Token string `json:"token"`
 	}{}
@@ -33,7 +34,6 @@ func NewDNSPod(data json.RawMessage, domain, host string, ipVersion models.IPVer
 		domain:    domain,
 		host:      host,
 		ipVersion: ipVersion,
-		dnsLookup: !noDNSLookup,
 		token:     extraSettings.Token,
 	}
 	if err := d.isValid(); err != nil {
@@ -44,7 +44,7 @@ func NewDNSPod(data json.RawMessage, domain, host string, ipVersion models.IPVer
 
 func (d *dnspod) isValid() error {
 	if len(d.token) == 0 {
-		return fmt.Errorf("token cannot be empty")
+		return ErrEmptyToken
 	}
 	return nil
 }
@@ -61,12 +61,12 @@ func (d *dnspod) Host() string {
 	return d.host
 }
 
-func (d *dnspod) IPVersion() models.IPVersion {
+func (d *dnspod) IPVersion() ipversion.IPVersion {
 	return d.ipVersion
 }
 
-func (d *dnspod) DNSLookup() bool {
-	return d.dnsLookup
+func (d *dnspod) Proxied() bool {
+	return false
 }
 
 func (d *dnspod) BuildDomainName() string {
@@ -82,7 +82,13 @@ func (d *dnspod) HTML() models.HTMLRow {
 	}
 }
 
-func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (d *dnspod) setHeaders(request *http.Request) {
+	setContentType(request, "application/x-www-form-urlencoded")
+	setAccept(request, "application/json")
+	setUserAgent(request)
+}
+
+func (d *dnspod) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	recordType := A
 	if ip.To4() == nil {
 		recordType = AAAA
@@ -92,6 +98,7 @@ func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err err
 		Host:   "dnsapi.cn",
 		Path:   "/Record.List",
 	}
+
 	values := url.Values{}
 	values.Set("login_token", d.token)
 	values.Set("format", "json")
@@ -99,19 +106,26 @@ func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err err
 	values.Set("length", "200")
 	values.Set("sub_domain", d.host)
 	values.Set("record_type", recordType)
-	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodPost, u.String(), bytes.NewBufferString(values.Encode()))
+	buffer := bytes.NewBufferString(values.Encode())
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, u.String(), buffer)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	d.setHeaders(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
 	var recordResp struct {
 		Records []struct {
 			ID    string `json:"id"`
@@ -121,9 +135,10 @@ func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err err
 			Line  string `json:"line"`
 		} `json:"records"`
 	}
-	if err := json.Unmarshal(content, &recordResp); err != nil {
-		return nil, err
+	if err := decoder.Decode(&recordResp); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
 	}
+
 	var recordID, recordLine string
 	for _, record := range recordResp.Records {
 		if record.Type == A && record.Name == d.host {
@@ -137,7 +152,7 @@ func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err err
 		}
 	}
 	if len(recordID) == 0 {
-		return nil, fmt.Errorf("record not found")
+		return nil, ErrNotFound
 	}
 
 	u.Path = "/Record.Ddns"
@@ -149,19 +164,26 @@ func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err err
 	values.Set("value", ip.String())
 	values.Set("record_line", recordLine)
 	values.Set("sub_domain", d.host)
-	u.RawQuery = values.Encode()
-	r, err = http.NewRequest(http.MethodPost, u.String(), bytes.NewBufferString(values.Encode()))
+	buffer = bytes.NewBufferString(values.Encode())
+
+	request, err = http.NewRequestWithContext(ctx, http.MethodPost, u.String(), buffer)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err = client.DoHTTPRequest(r)
+	d.setHeaders(request)
+
+	response, err = client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder = json.NewDecoder(response.Body)
 	var ddnsResp struct {
 		Record struct {
 			ID    int64  `json:"id"`
@@ -169,12 +191,16 @@ func (d *dnspod) Update(client network.Client, ip net.IP) (newIP net.IP, err err
 			Name  string `json:"name"`
 		} `json:"record"`
 	}
-	if err := json.Unmarshal(content, &ddnsResp); err != nil {
-		return nil, err
+	if err := decoder.Decode(&ddnsResp); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
 	}
-	receivedIP := net.ParseIP(ddnsResp.Record.Value)
-	if !ip.Equal(receivedIP) {
-		return nil, fmt.Errorf("ip not set")
+
+	ipStr := ddnsResp.Record.Value
+	receivedIP := net.ParseIP(ipStr)
+	if receivedIP == nil {
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ipStr)
+	} else if !ip.Equal(receivedIP) {
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, receivedIP.String())
 	}
 	return ip, nil
 }

internal/settings/dondominio.go

@@ -1,6 +1,7 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"net"
@@ -11,21 +12,20 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	netlib "github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
-//nolint:maligned
 type donDominio struct {
 	domain    string
 	host      string
-	ipVersion models.IPVersion
-	dnsLookup bool
+	ipVersion ipversion.IPVersion
 	username  string
 	password  string
 	name      string
 }
 
-func NewDonDominio(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewDonDominio(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Username string `json:"username"`
 		Password string `json:"password"`
@@ -41,7 +41,6 @@ func NewDonDominio(data json.RawMessage, domain, host string, ipVersion models.I
 		domain:    domain,
 		host:      host,
 		ipVersion: ipVersion,
-		dnsLookup: !noDNSLookup,
 		username:  extraSettings.Username,
 		password:  extraSettings.Password,
 		name:      extraSettings.Name,
@@ -55,13 +54,13 @@ func NewDonDominio(data json.RawMessage, domain, host string, ipVersion models.I
 func (d *donDominio) isValid() error {
 	switch {
 	case len(d.username) == 0:
-		return fmt.Errorf("username cannot be empty")
+		return ErrEmptyUsername
 	case len(d.password) == 0:
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	case len(d.name) == 0:
-		return fmt.Errorf("name cannot be empty")
+		return ErrEmptyName
 	case d.host != "@":
-		return fmt.Errorf(`host can only be "@"`)
+		return ErrHostOnlyAt
 	}
 	return nil
 }
@@ -78,12 +77,12 @@ func (d *donDominio) Host() string {
 	return d.host
 }
 
-func (d *donDominio) DNSLookup() bool {
-	return d.dnsLookup
+func (d *donDominio) IPVersion() ipversion.IPVersion {
+	return d.ipVersion
 }
 
-func (d *donDominio) IPVersion() models.IPVersion {
-	return d.ipVersion
+func (d *donDominio) Proxied() bool {
+	return false
 }
 
 func (d *donDominio) BuildDomainName() string {
@@ -99,7 +98,13 @@ func (d *donDominio) HTML() models.HTMLRow {
 	}
 }
 
-func (d *donDominio) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
+func (d *donDominio) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setContentType(request, "application/x-www-form-urlencoded")
+	setAccept(request, "application/json")
+}
+
+func (d *donDominio) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "simple-api.dondominio.net",
@@ -115,18 +120,27 @@ func (d *donDominio) Update(client netlib.Client, ip net.IP) (newIP net.IP, err
 	} else {
 		values.Set("ipv6", ip.String())
 	}
-	r, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(values.Encode()))
+	buffer := strings.NewReader(values.Encode())
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, u.String(), buffer)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentid.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	d.setHeaders(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
-	response := struct {
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var responseData struct {
 		Success          bool   `json:"success"`
 		ErrorCode        int    `json:"errorCode"`
 		ErrorCodeMessage string `json:"errorCodeMsg"`
@@ -136,20 +150,24 @@ func (d *donDominio) Update(client netlib.Client, ip net.IP) (newIP net.IP, err
 				IPv6 string `json:"ipv6"`
 			} `json:"gluerecords"`
 		} `json:"responseData"`
-	}{}
-	if err := json.Unmarshal(content, &response); err != nil {
-		return nil, err
 	}
-	if !response.Success {
-		return nil, fmt.Errorf("%s (error code %d)", response.ErrorCodeMessage, response.ErrorCode)
+	if err := decoder.Decode(&responseData); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
 	}
-	ipString := response.ResponseData.GlueRecords[0].IPv4
+
+	if !responseData.Success {
+		return nil, fmt.Errorf("%w: %s (error code %d)",
+			ErrUnsuccessfulResponse, responseData.ErrorCodeMessage, responseData.ErrorCode)
+	}
+	ipString := responseData.ResponseData.GlueRecords[0].IPv4
 	if !isIPv4 {
-		ipString = response.ResponseData.GlueRecords[0].IPv6
+		ipString = responseData.ResponseData.GlueRecords[0].IPv6
 	}
 	newIP = net.ParseIP(ipString)
 	if newIP == nil {
-		return nil, fmt.Errorf("IP address received %q is malformed", ipString)
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ipString)
+	} else if !ip.Equal(newIP) {
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 	}
 	return newIP, nil
 }

internal/settings/dreamhost.go

@@ -1,29 +1,31 @@
 package settings
 
 import (
+	"context"
+	"crypto/rand"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net"
 	"net/http"
 	"net/url"
 
-	"github.com/google/uuid"
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
 type dreamhost struct {
 	domain    string
 	host      string
-	ipVersion models.IPVersion
-	dnsLookup bool
+	ipVersion ipversion.IPVersion
 	key       string
 	matcher   regex.Matcher
 }
 
-func NewDreamhost(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewDreamhost(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	matcher regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Key string `json:"key"`
 	}{}
@@ -37,7 +39,6 @@ func NewDreamhost(data json.RawMessage, domain, host string, ipVersion models.IP
 		domain:    domain,
 		host:      host,
 		ipVersion: ipVersion,
-		dnsLookup: !noDNSLookup,
 		key:       extraSettings.Key,
 		matcher:   matcher,
 	}
@@ -69,12 +70,12 @@ func (d *dreamhost) Host() string {
 	return d.host
 }
 
-func (d *dreamhost) IPVersion() models.IPVersion {
+func (d *dreamhost) IPVersion() ipversion.IPVersion {
 	return d.ipVersion
 }
 
-func (d *dreamhost) DNSLookup() bool {
-	return d.dnsLookup
+func (d *dreamhost) Proxied() bool {
+	return false
 }
 
 func (d *dreamhost) BuildDomainName() string {
@@ -90,20 +91,22 @@ func (d *dreamhost) HTML() models.HTMLRow {
 	}
 }
 
-func (d *dreamhost) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (d *dreamhost) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	recordType := A
 	if ip.To4() == nil {
 		recordType = AAAA
 	}
-	records, err := listDreamhostRecords(client, d.key)
+
+	records, err := d.getRecords(ctx, client)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("%w: %s", ErrListRecords, err)
 	}
+
 	var oldIP net.IP
 	for _, data := range records.Data {
 		if data.Type == recordType && data.Record == d.BuildDomainName() {
 			if data.Editable == "0" {
-				return nil, fmt.Errorf("record data is not editable")
+				return nil, ErrRecordNotEditable
 			}
 			oldIP = net.ParseIP(data.Value)
 			if ip.Equal(oldIP) { // success, nothing to change
@@ -113,11 +116,15 @@ func (d *dreamhost) Update(client network.Client, ip net.IP) (newIP net.IP, err
 		}
 	}
 	if oldIP != nil { // Found editable record with a different IP address, so remove it
-		if err := removeDreamhostRecord(client, d.key, d.domain, oldIP); err != nil {
-			return nil, err
+		if err := d.removeRecord(ctx, client, oldIP); err != nil {
+			return nil, fmt.Errorf("%w: %s", ErrRemoveRecord, err)
 		}
 	}
-	return ip, addDreamhostRecord(client, d.key, d.domain, ip)
+	if err := d.createRecord(ctx, client, ip); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrCreateRecord, err)
+	}
+
+	return ip, nil
 }
 
 type (
@@ -136,106 +143,148 @@ type (
 	}
 )
 
-func makeDreamhostDefaultValues(key string) (values url.Values) { //nolint:unparam
-	values.Set("key", key)
-	values.Set("unique_id", uuid.New().String())
+func (d *dreamhost) defaultURLValues() (values url.Values) {
+	uuid := make([]byte, 16)
+	_, _ = io.ReadFull(rand.Reader, uuid)
+	//nolint:gomnd
+	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+	//nolint:gomnd
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+	values = url.Values{}
+	values.Set("key", d.key)
+	values.Set("unique_id", string(uuid))
 	values.Set("format", "json")
 	return values
 }
 
-func listDreamhostRecords(client network.Client, key string) (records dreamHostRecords, err error) {
+func (d *dreamhost) getRecords(ctx context.Context, client *http.Client) (
+	records dreamHostRecords, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "api.dreamhost.com",
 	}
-	values := makeDreamhostDefaultValues(key)
+	values := d.defaultURLValues()
 	values.Set("cmd", "dns-list_records")
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return records, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return records, err
-	} else if status != http.StatusOK {
-		return records, fmt.Errorf("HTTP status %d", status)
 	}
-	if err := json.Unmarshal(content, &records); err != nil {
-		return records, err
-	} else if records.Result != success {
-		return records, fmt.Errorf(records.Result)
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return records, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&records); err != nil {
+		return records, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if records.Result != success {
+		return records, fmt.Errorf("%w: %s", ErrUnsuccessfulResponse, records.Result)
 	}
 	return records, nil
 }
 
-func removeDreamhostRecord(client network.Client, key, domain string, ip net.IP) error { //nolint:dupl
+func (d *dreamhost) removeRecord(ctx context.Context, client *http.Client, ip net.IP) error {
 	recordType := A
 	if ip.To4() == nil {
 		recordType = AAAA
 	}
+
 	u := url.URL{
 		Scheme: "https",
 		Host:   "api.dreamhost.com",
 	}
-	values := makeDreamhostDefaultValues(key)
+	values := d.defaultURLValues()
 	values.Set("cmd", "dns-remove_record")
-	values.Set("record", domain)
+	values.Set("record", d.domain)
 	values.Set("type", recordType)
 	values.Set("value", ip.String())
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return err
-	} else if status != http.StatusOK {
-		return fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
 	var dhResponse dreamhostReponse
-	if err := json.Unmarshal(content, &dhResponse); err != nil {
-		return err
-	} else if dhResponse.Result != success { // this should not happen
-		return fmt.Errorf("%s - %s", dhResponse.Result, dhResponse.Data)
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&dhResponse); err != nil {
+		return fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if dhResponse.Result != success { // this should not happen
+		return fmt.Errorf("%w: %s - %s",
+			ErrUnsuccessfulResponse, dhResponse.Result, dhResponse.Data)
 	}
 	return nil
 }
 
-func addDreamhostRecord(client network.Client, key, domain string, ip net.IP) error { //nolint:dupl
+func (d *dreamhost) createRecord(ctx context.Context, client *http.Client, ip net.IP) error {
 	recordType := A
 	if ip.To4() == nil {
 		recordType = AAAA
 	}
+
 	u := url.URL{
 		Scheme: "https",
 		Host:   "api.dreamhost.com",
 	}
-	values := makeDreamhostDefaultValues(key)
+	values := d.defaultURLValues()
 	values.Set("cmd", "dns-add_record")
-	values.Set("record", domain)
+	values.Set("record", d.domain)
 	values.Set("type", recordType)
 	values.Set("value", ip.String())
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return err
-	} else if status != http.StatusOK {
-		return fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
 	var dhResponse dreamhostReponse
-	if err := json.Unmarshal(content, &dhResponse); err != nil {
-		return err
-	} else if dhResponse.Result != success {
-		return fmt.Errorf("%s - %s", dhResponse.Result, dhResponse.Data)
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&dhResponse); err != nil {
+		return fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if dhResponse.Result != success {
+		return fmt.Errorf("%w: %s - %s",
+			ErrUnsuccessfulResponse, dhResponse.Result, dhResponse.Data)
 	}
 	return nil
 }

internal/settings/duckdns.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -10,21 +12,20 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 	"github.com/qdm12/golibs/verification"
 )
 
-//nolint:maligned
 type duckdns struct {
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	token         string
 	useProviderIP bool
 	matcher       regex.Matcher
 }
 
-func NewDuckdns(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewDuckdns(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	matcher regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Token         string `json:"token"`
 		UseProviderIP bool   `json:"provider_ip"`
@@ -35,7 +36,6 @@ func NewDuckdns(data json.RawMessage, domain, host string, ipVersion models.IPVe
 	d := &duckdns{
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		token:         extraSettings.Token,
 		useProviderIP: extraSettings.UseProviderIP,
 		matcher:       matcher,
@@ -48,17 +48,17 @@ func NewDuckdns(data json.RawMessage, domain, host string, ipVersion models.IPVe
 
 func (d *duckdns) isValid() error {
 	if !d.matcher.DuckDNSToken(d.token) {
-		return fmt.Errorf("invalid token format")
+		return ErrMalformedToken
 	}
 	switch d.host {
 	case "@", "*":
-		return fmt.Errorf("host cannot be @ or * and must be a subdomain for DuckDNS")
+		return ErrHostOnlySubdomain
 	}
 	return nil
 }
 
 func (d *duckdns) String() string {
-	return toString("duckdns..org", d.host, constants.DUCKDNS, d.ipVersion)
+	return toString("duckdns.org", d.host, constants.DUCKDNS, d.ipVersion)
 }
 
 func (d *duckdns) Domain() string {
@@ -69,12 +69,12 @@ func (d *duckdns) Host() string {
 	return d.host
 }
 
-func (d *duckdns) IPVersion() models.IPVersion {
+func (d *duckdns) IPVersion() ipversion.IPVersion {
 	return d.ipVersion
 }
 
-func (d *duckdns) DNSLookup() bool {
-	return d.dnsLookup
+func (d *duckdns) Proxied() bool {
+	return false
 }
 
 func (d *duckdns) BuildDomainName() string {
@@ -90,7 +90,7 @@ func (d *duckdns) HTML() models.HTMLRow {
 	}
 }
 
-func (d *duckdns) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (d *duckdns) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "www.duckdns.org",
@@ -108,37 +108,50 @@ func (d *duckdns) Update(client network.Client, ip net.IP) (newIP net.IP, err er
 			values.Set("ip", ip.String())
 		}
 	}
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
-	s := string(content)
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyDataToSingleLine(s))
+	}
+
+	const minChars = 2
 	switch {
-	case len(s) < 2:
-		return nil, fmt.Errorf("response %q is too short", s)
-	case s[0:2] == "KO":
-		return nil, fmt.Errorf("invalid domain token combination")
-	case s[0:2] == "OK":
+	case len(s) < minChars:
+		return nil, fmt.Errorf("%w: response %q is too short", ErrUnmarshalResponse, s)
+	case s[0:minChars] == "KO":
+		return nil, ErrAuth
+	case s[0:minChars] == "OK":
 		ips := verification.NewVerifier().SearchIPv4(s)
 		if ips == nil {
-			return nil, fmt.Errorf("no IP address in response")
+			return nil, ErrNoResultReceived
 		}
 		newIP = net.ParseIP(ips[0])
 		if newIP == nil {
-			return nil, fmt.Errorf("IP address received %q is malformed", ips[0])
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ips[0])
 		}
 		if ip != nil && !newIP.Equal(ip) {
-			return nil, fmt.Errorf("new IP address %s is not %s", newIP.String(), ip.String())
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 		}
 		return newIP, nil
 	default:
-		return nil, fmt.Errorf("invalid response %q", s)
+		return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
 	}
 }

internal/settings/dyn.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -10,21 +12,20 @@ import (
 
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
-//nolint:maligned
 type dyn struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	username      string
 	password      string
 	useProviderIP bool
 }
 
-func NewDyn(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewDyn(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Username      string `json:"username"`
 		Password      string `json:"password"`
@@ -37,7 +38,6 @@ func NewDyn(data json.RawMessage, domain, host string, ipVersion models.IPVersio
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		username:      extraSettings.Username,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
@@ -51,11 +51,11 @@ func NewDyn(data json.RawMessage, domain, host string, ipVersion models.IPVersio
 func (d *dyn) isValid() error {
 	switch {
 	case len(d.username) == 0:
-		return fmt.Errorf("username cannot be empty")
+		return ErrEmptyUsername
 	case len(d.password) == 0:
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	case d.host == "*":
-		return fmt.Errorf(`host cannot be "*"`)
+		return ErrHostWildcard
 	}
 	return nil
 }
@@ -72,12 +72,12 @@ func (d *dyn) Host() string {
 	return d.host
 }
 
-func (d *dyn) IPVersion() models.IPVersion {
+func (d *dyn) IPVersion() ipversion.IPVersion {
 	return d.ipVersion
 }
 
-func (d *dyn) DNSLookup() bool {
-	return d.dnsLookup
+func (d *dyn) Proxied() bool {
+	return false
 }
 
 func (d *dyn) BuildDomainName() string {
@@ -93,7 +93,7 @@ func (d *dyn) HTML() models.HTMLRow {
 	}
 }
 
-func (d *dyn) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (d *dyn) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		User:   url.UserPassword(d.username, d.password),
@@ -101,37 +101,43 @@ func (d *dyn) Update(client network.Client, ip net.IP) (newIP net.IP, err error)
 		Path:   "/v3/update",
 	}
 	values := url.Values{}
-	switch d.host {
-	case "@":
-		values.Set("hostname", d.domain)
-	default:
-		values.Set("hostname", fmt.Sprintf("%s.%s", d.host, d.domain))
-	}
+	values.Set("hostname", d.BuildDomainName())
 	if !d.useProviderIP {
 		values.Set("myip", ip.String())
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
 	}
-	if status != http.StatusOK {
-		return nil, fmt.Errorf("HTTP status %d", status)
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
 	}
-	s := string(content)
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyDataToSingleLine(s))
+	}
+
 	switch {
-	case strings.HasPrefix(s, "notfqdn"):
-		return nil, fmt.Errorf("fully qualified domain name is not valid")
+	case strings.HasPrefix(s, notfqdn):
+		return nil, ErrHostnameNotExists
 	case strings.HasPrefix(s, "badrequest"):
-		return nil, fmt.Errorf("bad request")
+		return nil, ErrBadRequest
 	case strings.HasPrefix(s, "good"):
 		return ip, nil
 	default:
-		return nil, fmt.Errorf("unknown response: %s", s)
+		return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
 	}
 }

internal/settings/dynv6.go

@@ -0,0 +1,131 @@
+package settings
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+)
+
+type dynV6 struct {
+	domain        string
+	host          string
+	ipVersion     ipversion.IPVersion
+	token         string
+	useProviderIP bool
+}
+
+func NewDynV6(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Token         string `json:"token"`
+		UseProviderIP bool   `json:"provider_ip"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	d := &dynV6{
+		domain:        domain,
+		host:          host,
+		ipVersion:     ipVersion,
+		token:         extraSettings.Token,
+		useProviderIP: extraSettings.UseProviderIP,
+	}
+	if err := d.isValid(); err != nil {
+		return nil, err
+	}
+	return d, nil
+}
+
+func (d *dynV6) isValid() error {
+	switch {
+	case len(d.token) == 0:
+		return ErrEmptyToken
+	case d.host == "*":
+		return ErrHostWildcard
+	}
+	return nil
+}
+
+func (d *dynV6) String() string {
+	return fmt.Sprintf("[domain: %s | host: %s | provider: DynV6]", d.domain, d.host)
+}
+
+func (d *dynV6) Domain() string {
+	return d.domain
+}
+
+func (d *dynV6) Host() string {
+	return d.host
+}
+
+func (d *dynV6) IPVersion() ipversion.IPVersion {
+	return d.ipVersion
+}
+
+func (d *dynV6) Proxied() bool {
+	return false
+}
+
+func (d *dynV6) BuildDomainName() string {
+	return buildDomainName(d.host, d.domain)
+}
+
+func (d *dynV6) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", d.BuildDomainName(), d.BuildDomainName())),
+		Host:      models.HTML(d.Host()),
+		Provider:  "<a href=\"https://dynv6.com/\">DynV6 DNS</a>",
+		IPVersion: models.HTML(d.ipVersion),
+	}
+}
+
+func (d *dynV6) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	isIPv4 := ip.To4() != nil
+	host := "dynv6.com"
+	if isIPv4 {
+		host = "ipv4." + host
+	} else {
+		host = "ipv6." + host
+	}
+	u := url.URL{
+		Scheme: "https",
+		Host:   host,
+		Path:   "/api/update",
+	}
+	values := url.Values{}
+	values.Set("token", d.token)
+	values.Set("zone", d.BuildDomainName())
+	if !d.useProviderIP {
+		if isIPv4 {
+			values.Set("ipv4", ip.String())
+		} else {
+			values.Set("ipv6", ip.String())
+		}
+	}
+	u.RawQuery = values.Encode()
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	setUserAgent(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode == http.StatusOK {
+		return ip, nil
+	}
+	return nil, fmt.Errorf("%w: %d: %s",
+		ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+}

internal/settings/errors.go

@@ -0,0 +1,74 @@
+package settings
+
+import "errors"
+
+var (
+	ErrIPv6NotSupported = errors.New("IPv6 is not supported by this provider")
+)
+
+// Validation errors.
+var (
+	ErrEmptyName               = errors.New("empty name")
+	ErrEmptyPassword           = errors.New("empty password")
+	ErrEmptyKey                = errors.New("empty key")
+	ErrEmptyAppKey             = errors.New("empty app key")
+	ErrEmptyConsumerKey        = errors.New("empty consumer key")
+	ErrEmptySecret             = errors.New("empty secret")
+	ErrEmptyToken              = errors.New("empty token")
+	ErrEmptyTTL                = errors.New("TTL is not set")
+	ErrEmptyUsername           = errors.New("empty username")
+	ErrEmptyZoneIdentifier     = errors.New("empty zone identifier")
+	ErrHostOnlyAt              = errors.New(`host can only be "@"`)
+	ErrHostOnlySubdomain       = errors.New("host can only be a subdomain")
+	ErrHostWildcard            = errors.New(`host cannot be a "*"`)
+	ErrMalformedEmail          = errors.New("malformed email address")
+	ErrMalformedKey            = errors.New("malformed key")
+	ErrMalformedPassword       = errors.New("malformed password")
+	ErrMalformedToken          = errors.New("malformed token")
+	ErrMalformedUsername       = errors.New("malformed username")
+	ErrMalformedUserServiceKey = errors.New("malformed user service key")
+)
+
+// Intermediary steps errors.
+var (
+	ErrCreateRecord    = errors.New("cannot create record")
+	ErrGetDomainID     = errors.New("cannot get domain ID")
+	ErrGetRecordID     = errors.New("cannot get record ID")
+	ErrGetRecordInZone = errors.New("cannot get record in zone") // LuaDNS
+	ErrGetZoneID       = errors.New("cannot get zone ID")        // LuaDNS
+	ErrListRecords     = errors.New("cannot list records")       // Dreamhost
+	ErrRemoveRecord    = errors.New("cannot remove record")      // Dreamhost
+	ErrUpdateRecord    = errors.New("cannot update record")
+)
+
+// Update errors.
+var (
+	ErrAbuse                   = errors.New("banned due to abuse")
+	ErrAccountInactive         = errors.New("account is inactive")
+	ErrAuth                    = errors.New("bad authentication")
+	ErrRequestEncode           = errors.New("cannot encode request")
+	ErrBadHTTPStatus           = errors.New("bad HTTP status")
+	ErrBadRequest              = errors.New("bad request sent")
+	ErrBannedUserAgent         = errors.New("user agend is banned")
+	ErrConflictingRecord       = errors.New("conflicting record")
+	ErrDNSServerSide           = errors.New("server side DNS error")
+	ErrDomainDisabled          = errors.New("record disabled")
+	ErrDomainIDNotFound        = errors.New("ID not found in domain record")
+	ErrFeatureUnavailable      = errors.New("feature is not available to the user")
+	ErrHostnameNotExists       = errors.New("hostname does not exist")
+	ErrInvalidSystemParam      = errors.New("invalid system parameter")
+	ErrIPReceivedMalformed     = errors.New("malformed IP address received")
+	ErrIPReceivedMismatch      = errors.New("mismatching IP address received")
+	ErrMalformedIPSent         = errors.New("malformed IP address sent")
+	ErrNoResultReceived        = errors.New("no result received")
+	ErrNotFound                = errors.New("not found")
+	ErrNumberOfResultsReceived = errors.New("wrong number of results received")
+	ErrPrivateIPSent           = errors.New("private IP cannot be routed")
+	ErrRecordNotEditable       = errors.New("record is not editable") // Dreamhost
+	ErrRecordNotFound          = errors.New("record not found")
+	ErrRequestMarshal          = errors.New("cannot marshal request body")
+	ErrUnknownResponse         = errors.New("unknown response received")
+	ErrUnmarshalResponse       = errors.New("cannot unmarshal update response")
+	ErrUnsuccessfulResponse    = errors.New("unsuccessful response")
+	ErrZoneNotFound            = errors.New("zone not found") // LuaDNS
+)

internal/settings/freedns.go

@@ -0,0 +1,139 @@
+package settings
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/qdm12/ddns-updater/internal/constants"
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+)
+
+type freedns struct {
+	domain    string
+	host      string
+	ipVersion ipversion.IPVersion
+	token     string
+}
+
+func NewFreedns(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Token string `json:"token"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	f := &freedns{
+		domain:    domain,
+		host:      host,
+		ipVersion: ipVersion,
+		token:     extraSettings.Token,
+	}
+	if err := f.isValid(); err != nil {
+		return nil, err
+	}
+	return f, nil
+}
+
+func (f *freedns) isValid() error {
+	if len(f.token) == 0 {
+		return ErrEmptyToken
+	}
+	return nil
+}
+
+func (f *freedns) String() string {
+	return toString(f.domain, f.host, constants.FREEDNS, f.ipVersion)
+}
+
+func (f *freedns) Domain() string {
+	return f.domain
+}
+
+func (f *freedns) Host() string {
+	return f.host
+}
+
+func (f *freedns) Proxied() bool {
+	return false
+}
+
+func (f *freedns) IPVersion() ipversion.IPVersion {
+	return f.ipVersion
+}
+
+func (f *freedns) BuildDomainName() string {
+	return buildDomainName(f.host, f.domain)
+}
+
+func (f *freedns) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", f.BuildDomainName(), f.BuildDomainName())),
+		Host:      models.HTML(f.Host()),
+		Provider:  "<a href=\"https://freedns.afraid.org/\">FreeDNS</a>",
+		IPVersion: models.HTML(f.ipVersion),
+	}
+}
+
+func (f *freedns) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	var hostPrefix string
+	if ip.To4() == nil {
+		hostPrefix = "v6."
+	}
+
+	u := url.URL{
+		Scheme: "https",
+		Host:   hostPrefix + "sync.afraid.org",
+		Path:   "/u/" + f.token + "/",
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	setUserAgent(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
+	}
+
+	if s == "" {
+		return nil, ErrNoResultReceived
+	}
+
+	// Example: Updated demo.freshdns.com from 50.23.197.94 to 2607:f0d0:1102:d5::2
+	words := strings.Fields(s)
+	const expectedWords = 6
+	if len(words) != expectedWords {
+		return nil, fmt.Errorf("%w: not enough fields in response: %s", ErrUnmarshalResponse, s)
+	}
+
+	ipString := words[5]
+
+	newIP = net.ParseIP(ipString)
+	if newIP == nil {
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, newIP)
+	}
+
+	return newIP, nil
+}

internal/settings/gandi.go

@@ -0,0 +1,147 @@
+package settings
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/qdm12/ddns-updater/internal/constants"
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+)
+
+type gandi struct {
+	domain    string
+	host      string
+	ttl       int
+	ipVersion ipversion.IPVersion
+	key       string
+}
+
+func NewGandi(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Key string `json:"key"`
+		TTL int    `json:"ttl"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	g := &gandi{
+		domain:    domain,
+		host:      host,
+		ipVersion: ipVersion,
+		key:       extraSettings.Key,
+		ttl:       extraSettings.TTL,
+	}
+	if err := g.isValid(); err != nil {
+		return nil, err
+	}
+	return g, nil
+}
+
+func (g *gandi) isValid() error {
+	if len(g.key) == 0 {
+		return ErrEmptyKey
+	}
+	return nil
+}
+
+func (g *gandi) String() string {
+	return toString(g.domain, g.host, constants.GANDI, g.ipVersion)
+}
+
+func (g *gandi) Domain() string {
+	return g.domain
+}
+
+func (g *gandi) Host() string {
+	return g.host
+}
+
+func (g *gandi) IPVersion() ipversion.IPVersion {
+	return g.ipVersion
+}
+
+func (g *gandi) Proxied() bool {
+	return false
+}
+
+func (g *gandi) BuildDomainName() string {
+	return buildDomainName(g.host, g.domain)
+}
+
+func (g *gandi) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", g.BuildDomainName(), g.BuildDomainName())),
+		Host:      models.HTML(g.Host()),
+		Provider:  "<a href=\"https://www.gandi.net/\">gandi</a>",
+		IPVersion: models.HTML(g.ipVersion),
+	}
+}
+
+func (g *gandi) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setContentType(request, "application/json")
+	setAccept(request, "application/json")
+	request.Header.Set("X-Api-Key", g.key)
+}
+
+func (g *gandi) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	recordType := A
+	var ipStr string
+	if ip.To4() == nil { // IPv6
+		recordType = AAAA
+		ipStr = ip.To16().String()
+	} else {
+		ipStr = ip.To4().String()
+	}
+
+	u := url.URL{
+		Scheme: "https",
+		Host:   "dns.api.gandi.net",
+		Path:   fmt.Sprintf("/api/v5/domains/%s/records/%s/%s", g.domain, g.host, recordType),
+	}
+
+	buffer := bytes.NewBuffer(nil)
+	encoder := json.NewEncoder(buffer)
+	const defaultTTL = 3600
+	ttl := defaultTTL
+	if g.ttl != 0 {
+		ttl = g.ttl
+	}
+	requestData := struct {
+		Values [1]string `json:"rrset_values"`
+		TTL    int       `json:"rrset_ttl"`
+	}{
+		Values: [1]string{ipStr},
+		TTL:    ttl,
+	}
+	if err := encoder.Encode(requestData); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrRequestEncode, err)
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPut, u.String(), buffer)
+	if err != nil {
+		return nil, err
+	}
+	g.setHeaders(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusCreated {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	return ip, nil
+}

internal/settings/godaddy.go

@@ -1,30 +1,32 @@
 package settings
 
 import (
+	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
 
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
-	"github.com/qdm12/ddns-updater/internal/network"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	netlib "github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
 type godaddy struct {
 	domain    string
 	host      string
-	ipVersion models.IPVersion
-	dnsLookup bool
+	ipVersion ipversion.IPVersion
 	key       string
 	secret    string
 	matcher   regex.Matcher
 }
 
-func NewGodaddy(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewGodaddy(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	matcher regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Key    string `json:"key"`
 		Secret string `json:"secret"`
@@ -36,7 +38,6 @@ func NewGodaddy(data json.RawMessage, domain, host string, ipVersion models.IPVe
 		domain:    domain,
 		host:      host,
 		ipVersion: ipVersion,
-		dnsLookup: !noDNSLookup,
 		key:       extraSettings.Key,
 		secret:    extraSettings.Secret,
 		matcher:   matcher,
@@ -50,9 +51,9 @@ func NewGodaddy(data json.RawMessage, domain, host string, ipVersion models.IPVe
 func (g *godaddy) isValid() error {
 	switch {
 	case !g.matcher.GodaddyKey(g.key):
-		return fmt.Errorf("invalid key format")
-	case !g.matcher.GodaddySecret(g.secret):
-		return fmt.Errorf("invalid secret format")
+		return ErrMalformedKey
+	case len(g.secret) == 0:
+		return ErrEmptySecret
 	}
 	return nil
 }
@@ -69,12 +70,12 @@ func (g *godaddy) Host() string {
 	return g.host
 }
 
-func (g *godaddy) IPVersion() models.IPVersion {
+func (g *godaddy) IPVersion() ipversion.IPVersion {
 	return g.ipVersion
 }
 
-func (g *godaddy) DNSLookup() bool {
-	return g.dnsLookup
+func (g *godaddy) Proxied() bool {
+	return false
 }
 
 func (g *godaddy) BuildDomainName() string {
@@ -90,7 +91,14 @@ func (g *godaddy) HTML() models.HTMLRow {
 	}
 }
 
-func (g *godaddy) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
+func (g *godaddy) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setAuthSSOKey(request, g.key, g.secret)
+	setContentType(request, "application/json")
+	setAccept(request, "application/json")
+}
+
+func (g *godaddy) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	recordType := A
 	if ip.To4() == nil {
 		recordType = AAAA
@@ -103,25 +111,44 @@ func (g *godaddy) Update(client netlib.Client, ip net.IP) (newIP net.IP, err err
 		Host:   "api.godaddy.com",
 		Path:   fmt.Sprintf("/v1/domains/%s/records/%s/%s", g.domain, recordType, g.host),
 	}
-	r, err := network.BuildHTTPPut(u.String(), []goDaddyPutBody{{ip.String()}})
+
+	buffer := bytes.NewBuffer(nil)
+	encoder := json.NewEncoder(buffer)
+	requestData := []goDaddyPutBody{
+		{Data: ip.String()},
+	}
+	if err := encoder.Encode(requestData); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrRequestEncode, err)
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPut, u.String(), buffer)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	r.Header.Set("Authorization", "sso-key "+g.key+":"+g.secret)
-	status, content, err := client.DoHTTPRequest(r)
+	g.setHeaders(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		var parsedJSON struct {
-			Message string `json:"message"`
-		}
-		if err := json.Unmarshal(content, &parsedJSON); err != nil {
-			return nil, err
-		} else if len(parsedJSON.Message) > 0 {
-			return nil, fmt.Errorf("HTTP status %d - %s", status, parsedJSON.Message)
-		}
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
-	return ip, nil
+	defer response.Body.Close()
+
+	if response.StatusCode == http.StatusOK {
+		return ip, nil
+	}
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+	var parsedJSON struct {
+		Message string `json:"message"`
+	}
+	jsonErr := json.Unmarshal(b, &parsedJSON)
+	if jsonErr != nil || len(parsedJSON.Message) == 0 {
+		return nil, fmt.Errorf("%w: %s", err, bodyDataToSingleLine(string(b)))
+	}
+	return nil, fmt.Errorf("%w: %s", err, parsedJSON.Message)
 }

internal/settings/google.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -11,22 +13,21 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	netlib "github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 	"github.com/qdm12/golibs/verification"
 )
 
-//nolint:maligned
 type google struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	username      string
 	password      string
 	useProviderIP bool
 }
 
-func NewGoogle(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewGoogle(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Username      string `json:"username"`
 		Password      string `json:"password"`
@@ -39,7 +40,6 @@ func NewGoogle(data json.RawMessage, domain, host string, ipVersion models.IPVer
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		username:      extraSettings.Username,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
@@ -53,9 +53,9 @@ func NewGoogle(data json.RawMessage, domain, host string, ipVersion models.IPVer
 func (g *google) isValid() error {
 	switch {
 	case len(g.username) == 0:
-		return fmt.Errorf("username cannot be empty")
+		return ErrEmptyUsername
 	case len(g.password) == 0:
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	}
 	return nil
 }
@@ -72,12 +72,12 @@ func (g *google) Host() string {
 	return g.host
 }
 
-func (g *google) DNSLookup() bool {
-	return g.dnsLookup
+func (g *google) IPVersion() ipversion.IPVersion {
+	return g.ipVersion
 }
 
-func (g *google) IPVersion() models.IPVersion {
-	return g.ipVersion
+func (g *google) Proxied() bool {
+	return false
 }
 
 func (g *google) BuildDomainName() string {
@@ -93,7 +93,7 @@ func (g *google) HTML() models.HTMLRow {
 	}
 }
 
-func (g *google) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
+func (g *google) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "domains.google.com",
@@ -107,51 +107,55 @@ func (g *google) Update(client netlib.Client, ip net.IP) (newIP net.IP, err erro
 		values.Set("myip", ip.String())
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentig.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
 	}
-	s := string(content)
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
 	switch s {
 	case "":
-		return nil, fmt.Errorf("HTTP status %d", status)
-	case nohost:
-		return nil, fmt.Errorf("hostname does not exist")
+		return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
+	case nohost, notfqdn:
+		return nil, ErrHostnameNotExists
 	case badauth:
-		return nil, fmt.Errorf("invalid username password combination")
-	case "notfqdn":
-		return nil, fmt.Errorf("hostname %q is not a valid fully qualified domain name", fqdn)
-	case "badagent":
-		return nil, fmt.Errorf("user agent is banned")
-	case "abuse":
-		return nil, fmt.Errorf("username is banned due to abuse")
-	case "911":
-		return nil, fmt.Errorf("Google's internal server error 911")
-	case "conflict A":
-		return nil, fmt.Errorf("custom A record conflicts with the update")
-	case "conflict AAAA":
-		return nil, fmt.Errorf("custom AAAA record conflicts with the update")
+		return nil, ErrAuth
+	case badagent:
+		return nil, ErrBannedUserAgent
+	case abuse:
+		return nil, ErrAbuse
+	case nineoneone:
+		return nil, ErrDNSServerSide
+	case "conflict A", "conflict AAAA":
+		return nil, ErrConflictingRecord
 	}
 	if strings.Contains(s, "nochg") || strings.Contains(s, "good") {
 		ipsV4 := verification.NewVerifier().SearchIPv4(s)
 		ipsV6 := verification.NewVerifier().SearchIPv6(s)
 		ips := append(ipsV4, ipsV6...)
-		if ips == nil {
-			return nil, fmt.Errorf("no IP address in response")
+		if len(ips) == 0 {
+			return nil, ErrNoResultReceived
 		}
 		newIP = net.ParseIP(ips[0])
 		if newIP == nil {
-			return nil, fmt.Errorf("IP address received %q is malformed", ips[0])
-		}
-		if !g.useProviderIP && !ip.Equal(newIP) {
-			return nil, fmt.Errorf("new IP address %s is not %s", newIP.String(), ip.String())
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ips[0])
+		} else if !g.useProviderIP && !ip.Equal(newIP) {
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 		}
 		return newIP, nil
 	}
-	return nil, fmt.Errorf("invalid response %q", s)
+	return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
 }

internal/settings/he.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -11,21 +13,20 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	netlib "github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 	"github.com/qdm12/golibs/verification"
 )
 
-//nolint:maligned
 type he struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	password      string
 	useProviderIP bool
 }
 
-func NewHe(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewHe(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Password      string `json:"password"`
 		UseProviderIP bool   `json:"provider_ip"`
@@ -37,7 +38,6 @@ func NewHe(data json.RawMessage, domain, host string, ipVersion models.IPVersion
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
 	}
@@ -49,7 +49,7 @@ func NewHe(data json.RawMessage, domain, host string, ipVersion models.IPVersion
 
 func (h *he) isValid() error {
 	if len(h.password) == 0 {
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	}
 	return nil
 }
@@ -66,12 +66,12 @@ func (h *he) Host() string {
 	return h.host
 }
 
-func (h *he) DNSLookup() bool {
-	return h.dnsLookup
+func (h *he) IPVersion() ipversion.IPVersion {
+	return h.ipVersion
 }
 
-func (h *he) IPVersion() models.IPVersion {
-	return h.ipVersion
+func (h *he) Proxied() bool {
+	return false
 }
 
 func (h *he) BuildDomainName() string {
@@ -87,7 +87,7 @@ func (h *he) HTML() models.HTMLRow {
 	}
 }
 
-func (h *he) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
+func (h *he) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	fqdn := h.BuildDomainName()
 	u := url.URL{
 		Scheme: "https",
@@ -101,21 +101,30 @@ func (h *he) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
 		values.Set("myip", ip.String())
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentih.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
 	}
-	s := string(content)
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
 	switch s {
 	case "":
-		return nil, fmt.Errorf("HTTP status %d", status)
+		return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
 	case badauth:
-		return nil, fmt.Errorf("invalid username password combination")
+		return nil, ErrAuth
 	}
 	if strings.Contains(s, "nochg") || strings.Contains(s, "good") {
 		verifier := verification.NewVerifier()
@@ -123,16 +132,15 @@ func (h *he) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
 		ipsV6 := verifier.SearchIPv6(s)
 		ips := append(ipsV4, ipsV6...)
 		if ips == nil {
-			return nil, fmt.Errorf("no IP address in response")
+			return nil, ErrNoResultReceived
 		}
 		newIP = net.ParseIP(ips[0])
 		if newIP == nil {
-			return nil, fmt.Errorf("IP address received %q is malformed", ips[0])
-		}
-		if !h.useProviderIP && !ip.Equal(newIP) {
-			return nil, fmt.Errorf("new IP address %s is not %s", newIP.String(), ip.String())
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ips[0])
+		} else if !h.useProviderIP && !ip.Equal(newIP) {
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 		}
 		return newIP, nil
 	}
-	return nil, fmt.Errorf("invalid response %q", s)
+	return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
 }

internal/settings/headers.go

@@ -0,0 +1,31 @@
+package settings
+
+import "net/http"
+
+func setUserAgent(request *http.Request) {
+	request.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
+}
+
+func setContentType(request *http.Request, contentType string) {
+	request.Header.Set("Content-Type", contentType)
+}
+
+func setAccept(request *http.Request, acceptContent string) {
+	request.Header.Set("Accept", acceptContent)
+}
+
+func setAuthBearer(request *http.Request, token string) {
+	request.Header.Set("Authorization", "Bearer "+token)
+}
+
+func setAuthSSOKey(request *http.Request, key, secret string) {
+	request.Header.Set("Authorization", "sso-key "+key+":"+secret)
+}
+
+func setOauth(request *http.Request, value string) {
+	request.Header.Set("oauth", value)
+}
+
+func setXFilter(request *http.Request, value string) {
+	request.Header.Set("X-Filter", value)
+}

internal/settings/infomaniak.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -11,21 +13,20 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
-//nolint:maligned
 type infomaniak struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	username      string
 	password      string
 	useProviderIP bool
 }
 
-func NewInfomaniak(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewInfomaniak(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Username      string `json:"username"`
 		Password      string `json:"password"`
@@ -38,7 +39,6 @@ func NewInfomaniak(data json.RawMessage, domain, host string, ipVersion models.I
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		username:      extraSettings.Username,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
@@ -52,11 +52,11 @@ func NewInfomaniak(data json.RawMessage, domain, host string, ipVersion models.I
 func (i *infomaniak) isValid() error {
 	switch {
 	case len(i.username) == 0:
-		return fmt.Errorf("username cannot be empty")
+		return ErrEmptyUsername
 	case len(i.password) == 0:
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	case i.host == "*":
-		return fmt.Errorf(`host cannot be "*"`)
+		return ErrHostWildcard
 	}
 	return nil
 }
@@ -73,12 +73,12 @@ func (i *infomaniak) Host() string {
 	return i.host
 }
 
-func (i *infomaniak) IPVersion() models.IPVersion {
+func (i *infomaniak) IPVersion() ipversion.IPVersion {
 	return i.ipVersion
 }
 
-func (i *infomaniak) DNSLookup() bool {
-	return i.dnsLookup
+func (i *infomaniak) Proxied() bool {
+	return false
 }
 
 func (i *infomaniak) BuildDomainName() string {
@@ -94,7 +94,7 @@ func (i *infomaniak) HTML() models.HTMLRow {
 	}
 }
 
-func (i *infomaniak) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (i *infomaniak) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "infomaniak.com",
@@ -110,48 +110,57 @@ func (i *infomaniak) Update(client network.Client, ip net.IP) (newIP net.IP, err
 		values.Set("myip", ip.String())
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
 	}
-	s := string(content)
-	switch status {
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
+	switch response.StatusCode {
 	case http.StatusOK:
 		switch {
 		case strings.HasPrefix(s, "good "):
 			newIP = net.ParseIP(s[5:])
 			if newIP == nil {
-				return nil, fmt.Errorf("no received IP in response %q", s)
+				return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, s)
 			} else if ip != nil && !ip.Equal(newIP) {
-				return nil, fmt.Errorf("received IP %s is not equal to expected IP %s", newIP, ip)
+				return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP)
 			}
 			return newIP, nil
 		case strings.HasPrefix(s, "nochg "):
 			newIP = net.ParseIP(s[6:])
 			if newIP == nil {
-				return nil, fmt.Errorf("no received IP in response %q", s)
+				return nil, fmt.Errorf("%w: in response %q", ErrNoResultReceived, s)
 			} else if ip != nil && !ip.Equal(newIP) {
-				return nil, fmt.Errorf("received IP %s is not equal to expected IP %s", newIP, ip)
+				return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP)
 			}
 			return newIP, nil
 		default:
-			return nil, fmt.Errorf("ok status but unknown response %q", s)
+			return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
 		}
 	case http.StatusBadRequest:
 		switch s {
 		case nohost:
-			return nil, fmt.Errorf("infomaniak.com: host %q does not exist for domain %q", i.host, i.domain)
+			return nil, ErrHostnameNotExists
 		case badauth:
-			return nil, fmt.Errorf("infomaniak.com: bad authentication")
+			return nil, ErrAuth
 		default:
-			return nil, fmt.Errorf("infomaniak.com: bad request: %s", s)
+			return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
 		}
 	default:
-		return nil, fmt.Errorf("received status %d with message: %s", status, s)
+		return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
 	}
 }

internal/settings/linode.go

@@ -0,0 +1,358 @@
+package settings
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+
+	"github.com/qdm12/ddns-updater/internal/constants"
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+)
+
+type linode struct {
+	domain    string
+	host      string
+	ipVersion ipversion.IPVersion
+	token     string
+}
+
+func NewLinode(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Token string `json:"token"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	l := &linode{
+		domain:    domain,
+		host:      host,
+		ipVersion: ipVersion,
+		token:     extraSettings.Token,
+	}
+	if err := l.isValid(); err != nil {
+		return nil, err
+	}
+	return l, nil
+}
+
+func (l *linode) isValid() error {
+	if len(l.token) == 0 {
+		return ErrEmptyToken
+	}
+	return nil
+}
+
+func (l *linode) String() string {
+	return toString(l.domain, l.host, constants.LINODE, l.ipVersion)
+}
+
+func (l *linode) Domain() string {
+	return l.domain
+}
+
+func (l *linode) Host() string {
+	return l.host
+}
+
+func (l *linode) IPVersion() ipversion.IPVersion {
+	return l.ipVersion
+}
+
+func (l *linode) Proxied() bool {
+	return false
+}
+
+func (l *linode) BuildDomainName() string {
+	return buildDomainName(l.host, l.domain)
+}
+
+func (l *linode) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", l.BuildDomainName(), l.BuildDomainName())),
+		Host:      models.HTML(l.Host()),
+		Provider:  "<a href=\"https://cloud.linode.com/\">Linode</a>",
+		IPVersion: models.HTML(l.ipVersion),
+	}
+}
+
+// Using https://www.linode.com/docs/api/domains/
+func (l *linode) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	domainID, err := l.getDomainID(ctx, client)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrGetDomainID, err)
+	}
+
+	recordType := A
+	if ip.To4() == nil {
+		recordType = AAAA
+	}
+
+	recordID, err := l.getRecordID(ctx, client, domainID, recordType)
+	if errors.Is(err, ErrNotFound) {
+		err := l.createRecord(ctx, client, domainID, recordType, ip)
+		if err != nil {
+			return nil, fmt.Errorf("%w: %s", ErrCreateRecord, err)
+		}
+		return ip, nil
+	} else if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrGetRecordID, err)
+	}
+
+	if err := l.updateRecord(ctx, client, domainID, recordID, ip); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUpdateRecord, err)
+	}
+
+	return ip, nil
+}
+
+type linodeError struct {
+	Field  string `json:"field"`
+	Reason string `json:"reason"`
+}
+
+func (l *linode) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setContentType(request, "application/json")
+	setAuthBearer(request, l.token)
+}
+
+func (l *linode) getDomainID(ctx context.Context, client *http.Client) (domainID int, err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.linode.com",
+		Path:   "/v4/domains",
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return 0, err
+	}
+	l.setHeaders(request)
+	setOauth(request, "domains:read_only")
+	setXFilter(request, `{"domain": "`+l.domain+`"}`)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return 0, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		return 0, fmt.Errorf("%w: %s", err, l.getError(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var obj struct {
+		Data []struct {
+			ID     *int   `json:"id,omitempty"`
+			Type   string `json:"type"`
+			Status string `json:"status"`
+		} `json:"data"`
+	}
+	if err := decoder.Decode(&obj); err != nil {
+		return 0, err
+	}
+
+	domains := obj.Data
+	switch len(domains) {
+	case 0:
+		return 0, ErrNotFound
+	case 1:
+	default:
+		return 0, fmt.Errorf("%w: %d records instead of 1",
+			ErrNumberOfResultsReceived, len(domains))
+	}
+
+	if domains[0].Status == "disabled" {
+		return 0, ErrDomainDisabled
+	}
+
+	if domains[0].ID == nil {
+		return 0, ErrDomainIDNotFound
+	}
+
+	return *domains[0].ID, nil
+}
+
+func (l *linode) getRecordID(ctx context.Context, client *http.Client,
+	domainID int, recordType string) (recordID int, err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.linode.com",
+		Path:   "/v4/domains/" + strconv.Itoa(domainID) + "/records",
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return 0, err
+	}
+	l.setHeaders(request)
+	setOauth(request, "domains:read_only")
+
+	response, err := client.Do(request)
+	if err != nil {
+		return 0, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		return 0, fmt.Errorf("%w: %s", err, l.getError(response.Body))
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	var obj struct {
+		Data []struct {
+			ID   int    `json:"id"`
+			Host string `json:"name"`
+			Type string `json:"type"`
+		} `json:"data"`
+	}
+	if err := decoder.Decode(&obj); err != nil {
+		return 0, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	for _, domainRecord := range obj.Data {
+		if domainRecord.Type == recordType && domainRecord.Host == l.host {
+			return domainRecord.ID, nil
+		}
+	}
+
+	return 0, ErrNotFound
+}
+
+func (l *linode) createRecord(ctx context.Context, client *http.Client,
+	domainID int, recordType string, ip net.IP) (err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.linode.com",
+		Path:   "/v4/domains/" + strconv.Itoa(domainID) + "/records",
+	}
+
+	type domainRecord struct {
+		Type string `json:"type"`
+		Host string `json:"name"`
+		IP   string `json:"target"`
+	}
+
+	requestData := domainRecord{
+		Type: recordType,
+		Host: l.host,
+		IP:   ip.String(),
+	}
+	buffer := bytes.NewBuffer(nil)
+	encoder := json.NewEncoder(buffer)
+	if err := encoder.Encode(requestData); err != nil {
+		return fmt.Errorf("%w: %s", ErrRequestMarshal, err)
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPost, u.String(), buffer)
+	if err != nil {
+		return err
+	}
+	l.setHeaders(request)
+	setOauth(request, "domains:read_write")
+
+	response, err := client.Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		return fmt.Errorf("%w: %s", err, l.getError(response.Body))
+	}
+
+	var responseData domainRecord
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&responseData); err != nil {
+		return fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	newIP := net.ParseIP(responseData.IP)
+	if newIP == nil {
+		return fmt.Errorf("%w: %s", ErrIPReceivedMalformed, responseData.IP)
+	} else if !newIP.Equal(ip) {
+		return fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
+	}
+
+	return nil
+}
+
+func (l *linode) updateRecord(ctx context.Context, client *http.Client,
+	domainID, recordID int, ip net.IP) (err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.linode.com",
+		Path:   "/v4/domains/" + strconv.Itoa(domainID) + "/records/" + strconv.Itoa(recordID),
+	}
+
+	data := struct {
+		IP string `json:"target"`
+	}{
+		IP: ip.String(),
+	}
+	buffer := bytes.NewBuffer(nil)
+	encoder := json.NewEncoder(buffer)
+	if err := encoder.Encode(data); err != nil {
+		return fmt.Errorf("%w: %s", ErrRequestMarshal, err)
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPut, u.String(), buffer)
+	if err != nil {
+		return err
+	}
+	l.setHeaders(request)
+	setOauth(request, "domains:read_write")
+
+	response, err := client.Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		return fmt.Errorf("%w: %s", err, l.getError(response.Body))
+	}
+
+	data.IP = ""
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&data); err != nil {
+		return fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	newIP := net.ParseIP(data.IP)
+	if newIP == nil {
+		return fmt.Errorf("%w: %s", ErrIPReceivedMalformed, data.IP)
+	} else if !newIP.Equal(ip) {
+		return fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
+	}
+
+	return nil
+}
+
+func (l *linode) getError(body io.Reader) (err error) {
+	var errorObj linodeError
+	b, err := ioutil.ReadAll(body)
+	if err != nil {
+		return err
+	}
+	if err := json.Unmarshal(b, &errorObj); err != nil {
+		return fmt.Errorf("%s", bodyDataToSingleLine(string(b)))
+	}
+	return fmt.Errorf("%s: %s", errorObj.Field, errorObj.Reason)
+}

internal/settings/luadns.go

@@ -0,0 +1,284 @@
+package settings
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/qdm12/ddns-updater/internal/constants"
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+	"github.com/qdm12/golibs/verification"
+)
+
+type luaDNS struct {
+	domain    string
+	host      string
+	ipVersion ipversion.IPVersion
+	email     string
+	token     string
+}
+
+func NewLuaDNS(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Email string `json:"email"`
+		Token string `json:"token"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	l := &luaDNS{
+		domain:    domain,
+		host:      host,
+		ipVersion: ipVersion,
+		email:     extraSettings.Email,
+		token:     extraSettings.Token,
+	}
+	if err := l.isValid(); err != nil {
+		return nil, err
+	}
+	return l, nil
+}
+
+func (l *luaDNS) isValid() error {
+	switch {
+	case !verification.NewRegex().MatchEmail(l.email):
+		return ErrMalformedEmail
+	case len(l.token) == 0:
+		return ErrEmptyToken
+	}
+	return nil
+}
+
+func (l *luaDNS) String() string {
+	return toString(l.domain, l.host, constants.LUADNS, l.ipVersion)
+}
+
+func (l *luaDNS) Domain() string {
+	return l.domain
+}
+
+func (l *luaDNS) Host() string {
+	return l.host
+}
+
+func (l *luaDNS) IPVersion() ipversion.IPVersion {
+	return l.ipVersion
+}
+
+func (l *luaDNS) Proxied() bool {
+	return false
+}
+
+func (l *luaDNS) BuildDomainName() string {
+	return buildDomainName(l.host, l.domain)
+}
+
+func (l *luaDNS) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", l.BuildDomainName(), l.BuildDomainName())),
+		Host:      models.HTML(l.Host()),
+		Provider:  "<a href=\"https://www.luadns.com/\">LuaDNS</a>",
+		IPVersion: models.HTML(l.ipVersion),
+	}
+}
+
+func (l *luaDNS) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setAccept(request, "application/json")
+}
+
+// Using https://www.luadns.com/api.html
+func (l *luaDNS) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	zoneID, err := l.getZoneID(ctx, client)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrGetZoneID, err)
+	}
+
+	record, err := l.getRecord(ctx, client, zoneID, ip)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrGetRecordInZone, err)
+	}
+
+	newRecord := record
+	newRecord.Content = ip.String()
+	if err := l.updateRecord(ctx, client, zoneID, newRecord); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUpdateRecord, err)
+	}
+	return ip, nil
+}
+
+type luaDNSRecord struct {
+	ID      int    `json:"id"`
+	Name    string `json:"name"`
+	Type    string `json:"type"`
+	Content string `json:"content"`
+	TTL     int    `json:"ttl"`
+}
+
+type luaDNSError struct {
+	Status  string `json:"status"`
+	Message string `json:"message"`
+}
+
+func (l *luaDNS) getZoneID(ctx context.Context, client *http.Client) (zoneID int, err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.luadns.com",
+		Path:   "/v1/zones",
+		User:   url.UserPassword(l.email, l.token),
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return 0, err
+	}
+	request.Header.Set("Accept", "application/json")
+	request.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
+
+	response, err := client.Do(request)
+	if err != nil {
+		return 0, err
+	}
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return 0, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		var errorObj luaDNSError
+		if jsonErr := json.Unmarshal(b, &errorObj); jsonErr != nil {
+			return 0, fmt.Errorf("%w: %s", err, bodyDataToSingleLine(string(b)))
+		}
+		return 0, fmt.Errorf("%w: %s: %s", err, errorObj.Status, errorObj.Message)
+	}
+	type zone struct {
+		ID   int    `json:"id"`
+		Name string `json:"name"`
+	}
+	var zones []zone
+
+	if err := json.Unmarshal(b, &zones); err != nil {
+		return 0, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	for _, zone := range zones {
+		if zone.Name == l.domain {
+			return zone.ID, nil
+		}
+	}
+	return 0, ErrZoneNotFound
+}
+
+func (l *luaDNS) getRecord(ctx context.Context, client *http.Client, zoneID int, ip net.IP) (
+	record luaDNSRecord, err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.luadns.com",
+		Path:   fmt.Sprintf("/v1/zones/%d/records", zoneID),
+		User:   url.UserPassword(l.email, l.token),
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return record, err
+	}
+	l.setHeaders(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return record, err
+	}
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return record, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		var errorObj luaDNSError
+		if jsonErr := json.Unmarshal(b, &errorObj); jsonErr != nil {
+			return record, fmt.Errorf("%w: %s", err, bodyDataToSingleLine(string(b)))
+		}
+		return record, fmt.Errorf("%w: %s: %s",
+			err, errorObj.Status, errorObj.Message)
+	}
+	var records []luaDNSRecord
+
+	if err := json.Unmarshal(b, &records); err != nil {
+		return record, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	recordType := A
+	if ip.To4() == nil {
+		recordType = AAAA
+	}
+	for _, record := range records {
+		if record.Type == recordType {
+			return record, nil
+		}
+	}
+	return record, fmt.Errorf("%w: %s record in zone %d",
+		ErrRecordNotFound, recordType, zoneID)
+}
+
+func (l *luaDNS) updateRecord(ctx context.Context, client *http.Client,
+	zoneID int, newRecord luaDNSRecord) (err error) {
+	u := url.URL{
+		Scheme: "https",
+		Host:   "api.luadns.com",
+		Path:   fmt.Sprintf("/v1/zones/%d/records/%d", zoneID, newRecord.ID),
+		User:   url.UserPassword(l.email, l.token),
+	}
+	data, err := json.Marshal(newRecord)
+	if err != nil {
+		return err
+	}
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodPut, u.String(), bytes.NewBuffer(data))
+	if err != nil {
+		return err
+	}
+	l.setHeaders(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if response.StatusCode != http.StatusOK {
+		err = fmt.Errorf("%w: %d", ErrBadHTTPStatus, response.StatusCode)
+		var errorObj luaDNSError
+		if jsonErr := json.Unmarshal(b, &errorObj); jsonErr != nil {
+			return fmt.Errorf("%w: %s", err, bodyDataToSingleLine(string(b)))
+		}
+		return fmt.Errorf("%w: %s: %s",
+			err, errorObj.Status, errorObj.Message)
+	}
+
+	var updatedRecord luaDNSRecord
+	if jsonErr := json.Unmarshal(b, &updatedRecord); jsonErr != nil {
+		return fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if updatedRecord.Content != newRecord.Content {
+		return fmt.Errorf("%w: %s", ErrIPReceivedMismatch, updatedRecord.Content)
+	}
+	return nil
+}

internal/settings/namecheap.go

@@ -1,6 +1,7 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
@@ -11,23 +12,22 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 )
 
-//nolint:maligned
 type namecheap struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	password      string
 	useProviderIP bool
 	matcher       regex.Matcher
 }
 
-func NewNamecheap(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
-	if ipVersion == constants.IPv6 {
-		return s, fmt.Errorf("IPv6 is not supported by Namecheap API sadly")
+func NewNamecheap(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	matcher regex.Matcher) (s Settings, err error) {
+	if ipVersion == ipversion.IP6 {
+		return s, ErrIPv6NotSupported
 	}
 	extraSettings := struct {
 		Password      string `json:"password"`
@@ -40,7 +40,6 @@ func NewNamecheap(data json.RawMessage, domain, host string, ipVersion models.IP
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
 		matcher:       matcher,
@@ -53,7 +52,7 @@ func NewNamecheap(data json.RawMessage, domain, host string, ipVersion models.IP
 
 func (n *namecheap) isValid() error {
 	if !n.matcher.NamecheapPassword(n.password) {
-		return fmt.Errorf("invalid password format")
+		return ErrMalformedPassword
 	}
 	return nil
 }
@@ -70,12 +69,12 @@ func (n *namecheap) Host() string {
 	return n.host
 }
 
-func (n *namecheap) IPVersion() models.IPVersion {
+func (n *namecheap) IPVersion() ipversion.IPVersion {
 	return n.ipVersion
 }
 
-func (n *namecheap) DNSLookup() bool {
-	return n.dnsLookup
+func (n *namecheap) Proxied() bool {
+	return false
 }
 
 func (n *namecheap) BuildDomainName() string {
@@ -91,7 +90,12 @@ func (n *namecheap) HTML() models.HTMLRow {
 	}
 }
 
-func (n *namecheap) Update(client network.Client, ip net.IP) (newIP net.IP, err error) {
+func (n *namecheap) setHeaders(request *http.Request) {
+	setUserAgent(request)
+	setAccept(request, "application/xml")
+}
+
+func (n *namecheap) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "dynamicdns.park-your-domain.com",
@@ -105,35 +109,44 @@ func (n *namecheap) Update(client network.Client, ip net.IP) (newIP net.IP, err
 		values.Set("ip", ip.String())
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	n.setHeaders(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
-	} else if status != http.StatusOK {
-		return nil, fmt.Errorf("HTTP status %d", status)
 	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s",
+			ErrBadHTTPStatus, response.StatusCode, bodyToSingleLine(response.Body))
+	}
+
+	decoder := xml.NewDecoder(response.Body)
 	var parsedXML struct {
 		Errors struct {
 			Error string `xml:"Err1"`
 		} `xml:"errors"`
 		IP string `xml:"IP"`
 	}
-	err = xml.Unmarshal(content, &parsedXML)
-	if err != nil {
-		return nil, err
-	} else if parsedXML.Errors.Error != "" {
-		return nil, fmt.Errorf(parsedXML.Errors.Error)
+	if err := decoder.Decode(&parsedXML); err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+
+	if parsedXML.Errors.Error != "" {
+		return nil, fmt.Errorf("%w: %s", ErrUnsuccessfulResponse, parsedXML.Errors.Error)
 	}
 	newIP = net.ParseIP(parsedXML.IP)
 	if newIP == nil {
-		return nil, fmt.Errorf("IP address received %q is malformed", parsedXML.IP)
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, parsedXML.IP)
 	}
 	if ip != nil && !ip.Equal(newIP) {
-		return nil, fmt.Errorf("new IP address %s is not %s", newIP.String(), ip.String())
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 	}
 	return newIP, nil
 }

internal/settings/noip.go

@@ -1,8 +1,10 @@
 package settings
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -11,22 +13,21 @@ import (
 	"github.com/qdm12/ddns-updater/internal/constants"
 	"github.com/qdm12/ddns-updater/internal/models"
 	"github.com/qdm12/ddns-updater/internal/regex"
-	netlib "github.com/qdm12/golibs/network"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
 	"github.com/qdm12/golibs/verification"
 )
 
-//nolint:maligned
 type noip struct {
 	domain        string
 	host          string
-	ipVersion     models.IPVersion
-	dnsLookup     bool
+	ipVersion     ipversion.IPVersion
 	username      string
 	password      string
 	useProviderIP bool
 }
 
-func NewNoip(data json.RawMessage, domain, host string, ipVersion models.IPVersion, noDNSLookup bool, matcher regex.Matcher) (s Settings, err error) {
+func NewNoip(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
 	extraSettings := struct {
 		Username      string `json:"username"`
 		Password      string `json:"password"`
@@ -39,7 +40,6 @@ func NewNoip(data json.RawMessage, domain, host string, ipVersion models.IPVersi
 		domain:        domain,
 		host:          host,
 		ipVersion:     ipVersion,
-		dnsLookup:     !noDNSLookup,
 		username:      extraSettings.Username,
 		password:      extraSettings.Password,
 		useProviderIP: extraSettings.UseProviderIP,
@@ -51,15 +51,16 @@ func NewNoip(data json.RawMessage, domain, host string, ipVersion models.IPVersi
 }
 
 func (n *noip) isValid() error {
+	const maxUsernameLength = 50
 	switch {
 	case len(n.username) == 0:
-		return fmt.Errorf("username cannot be empty")
-	case len(n.username) > 50:
-		return fmt.Errorf("username cannot be longer than 50 characters")
+		return ErrEmptyUsername
+	case len(n.username) > maxUsernameLength:
+		return fmt.Errorf("%w: longer than 50 characters", ErrMalformedUsername)
 	case len(n.password) == 0:
-		return fmt.Errorf("password cannot be empty")
+		return ErrEmptyPassword
 	case n.host == "*":
-		return fmt.Errorf(`host cannot be "*"`)
+		return ErrHostWildcard
 	}
 	return nil
 }
@@ -76,12 +77,12 @@ func (n *noip) Host() string {
 	return n.host
 }
 
-func (n *noip) DNSLookup() bool {
-	return n.dnsLookup
+func (n *noip) IPVersion() ipversion.IPVersion {
+	return n.ipVersion
 }
 
-func (n *noip) IPVersion() models.IPVersion {
-	return n.ipVersion
+func (n *noip) Proxied() bool {
+	return false
 }
 
 func (n *noip) BuildDomainName() string {
@@ -97,7 +98,7 @@ func (n *noip) HTML() models.HTMLRow {
 	}
 }
 
-func (n *noip) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error) {
+func (n *noip) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
 	u := url.URL{
 		Scheme: "https",
 		Host:   "dynupdate.no-ip.com",
@@ -114,45 +115,58 @@ func (n *noip) Update(client netlib.Client, ip net.IP) (newIP net.IP, err error)
 		}
 	}
 	u.RawQuery = values.Encode()
-	r, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
 	}
-	r.Header.Set("User-Agent", "DDNS-Updater quentin.mcgaw@gmail.com")
-	status, content, err := client.DoHTTPRequest(r)
+	setUserAgent(request)
+
+	response, err := client.Do(request)
 	if err != nil {
 		return nil, err
 	}
-	s := string(content)
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
+	}
+
 	switch s {
 	case "":
-		return nil, fmt.Errorf("HTTP status %d", status)
-	case "911":
-		return nil, fmt.Errorf("NoIP's internal server error 911")
-	case "abuse":
-		return nil, fmt.Errorf("username is banned due to abuse")
+		return nil, ErrNoResultReceived
+	case nineoneone:
+		return nil, ErrDNSServerSide
+	case abuse:
+		return nil, ErrAbuse
 	case "!donator":
-		return nil, fmt.Errorf("user has not this extra feature")
-	case "badagent":
-		return nil, fmt.Errorf("user agent is banned")
+		return nil, ErrFeatureUnavailable
+	case badagent:
+		return nil, ErrBannedUserAgent
 	case badauth:
-		return nil, fmt.Errorf("invalid username password combination")
+		return nil, ErrAuth
 	case nohost:
-		return nil, fmt.Errorf("hostname does not exist")
+		return nil, ErrHostnameNotExists
 	}
 	if strings.Contains(s, "nochg") || strings.Contains(s, "good") {
 		ips := verification.NewVerifier().SearchIPv4(s)
 		if ips == nil {
-			return nil, fmt.Errorf("no IP address in response")
+			return nil, ErrNoResultReceived
 		}
 		newIP = net.ParseIP(ips[0])
 		if newIP == nil {
-			return nil, fmt.Errorf("IP address received %q is malformed", ips[0])
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, ips[0])
 		}
 		if !n.useProviderIP && !ip.Equal(newIP) {
-			return nil, fmt.Errorf("new IP address %s is not %s", newIP.String(), ip.String())
+			return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, newIP.String())
 		}
 		return newIP, nil
 	}
-	return nil, fmt.Errorf("invalid response %q", s)
+	return nil, ErrUnknownResponse
 }

internal/settings/opendns.go

@@ -0,0 +1,143 @@
+package settings
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/qdm12/ddns-updater/internal/models"
+	"github.com/qdm12/ddns-updater/internal/regex"
+	"github.com/qdm12/ddns-updater/pkg/publicip/ipversion"
+)
+
+type opendns struct {
+	domain        string
+	host          string
+	ipVersion     ipversion.IPVersion
+	username      string
+	password      string
+	useProviderIP bool
+}
+
+func NewOpendns(data json.RawMessage, domain, host string, ipVersion ipversion.IPVersion,
+	_ regex.Matcher) (s Settings, err error) {
+	extraSettings := struct {
+		Username      string `json:"username"`
+		Password      string `json:"password"`
+		UseProviderIP bool   `json:"provider_ip"`
+	}{}
+	if err := json.Unmarshal(data, &extraSettings); err != nil {
+		return nil, err
+	}
+	o := &opendns{
+		domain:        domain,
+		host:          host,
+		ipVersion:     ipVersion,
+		username:      extraSettings.Username,
+		password:      extraSettings.Password,
+		useProviderIP: extraSettings.UseProviderIP,
+	}
+	if err := o.isValid(); err != nil {
+		return nil, err
+	}
+	return o, nil
+}
+
+func (o *opendns) isValid() error {
+	switch {
+	case len(o.username) == 0:
+		return ErrEmptyUsername
+	case len(o.password) == 0:
+		return ErrEmptyPassword
+	case o.host == "*":
+		return ErrHostWildcard
+	}
+	return nil
+}
+
+func (o *opendns) String() string {
+	return fmt.Sprintf("[domain: %s | host: %s | provider: Opendns]", o.domain, o.host)
+}
+
+func (o *opendns) Domain() string {
+	return o.domain
+}
+
+func (o *opendns) Host() string {
+	return o.host
+}
+
+func (o *opendns) IPVersion() ipversion.IPVersion {
+	return o.ipVersion
+}
+
+func (o *opendns) Proxied() bool {
+	return false
+}
+
+func (o *opendns) BuildDomainName() string {
+	return buildDomainName(o.host, o.domain)
+}
+
+func (o *opendns) HTML() models.HTMLRow {
+	return models.HTMLRow{
+		Domain:    models.HTML(fmt.Sprintf("<a href=\"http://%s\">%s</a>", o.BuildDomainName(), o.BuildDomainName())),
+		Host:      models.HTML(o.Host()),
+		Provider:  "<a href=\"https://opendns.com/\">Opendns DNS</a>",
+		IPVersion: models.HTML(o.ipVersion),
+	}
+}
+
+func (o *opendns) Update(ctx context.Context, client *http.Client, ip net.IP) (newIP net.IP, err error) {
+	u := url.URL{
+		Scheme: "https",
+		User:   url.UserPassword(o.username, o.password),
+		Host:   "updates.opendns.com",
+		Path:   "/nic/update",
+	}
+	values := url.Values{}
+	values.Set("hostname", o.BuildDomainName())
+	if !o.useProviderIP {
+		values.Set("myip", ip.String())
+	}
+	u.RawQuery = values.Encode()
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	setUserAgent(request)
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return nil, fmt.Errorf("%w: %s", ErrUnmarshalResponse, err)
+	}
+	s := string(b)
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d: %s", ErrBadHTTPStatus, response.StatusCode, s)
+	}
+
+	if !strings.HasPrefix(s, "good ") {
+		return nil, fmt.Errorf("%w: %s", ErrUnknownResponse, s)
+	}
+	responseIPString := strings.TrimPrefix(s, "good ")
+	responseIP := net.ParseIP(responseIPString)
+	if responseIP == nil {
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMalformed, responseIPString)
+	} else if !newIP.Equal(ip) {
+		return nil, fmt.Errorf("%w: %s", ErrIPReceivedMismatch, responseIP)
+	}
+	return ip, nil
+}