Feat: PUBLICIP_DNS_TIMEOUT variable

Dockerfile

@@ -76,6 +76,7 @@ ENV \
     PUBLICIPV4_HTTP_PROVIDERS=all \
     PUBLICIPV6_HTTP_PROVIDERS=all \
     PUBLICIP_DNS_PROVIDERS=all \
+    PUBLICIP_DNS_TIMEOUT=3s \
     HTTP_TIMEOUT=10s \
     DATADIR=/updater/data \
 

README.md

@@ -177,6 +177,7 @@ Note that:
 | `PUBLICIPV4_HTTP_PROVIDERS` | `all` | Comma separated providers to obtain the public IPv4 address only. See the [Public IP section](#Public-IP) |
 | `PUBLICIPV6_HTTP_PROVIDERS` | `all` | Comma separated providers to obtain the public IPv6 address only. See the [Public IP section](#Public-IP) |
 | `PUBLICIP_DNS_PROVIDERS` | `all` | Comma separated providers to obtain the public IP address (IPv4 and/or IPv6). See the [Public IP section](#Public-IP) |
+| `PUBLICIP_DNS_TIMEOUT` | `3s` | Public IP DNS query timeout |
 | `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 |

docker-compose.yml

@@ -17,6 +17,7 @@ services:
       - PUBLICIPV4_HTTP_PROVIDERS=all
       - PUBLICIPV6_HTTP_PROVIDERS=all
       - PUBLICIP_DNS_PROVIDERS=all
+      - PUBLICIP_DNS_TIMEOUT=3s
       - HTTP_TIMEOUT=10s
 
       # Web UI

internal/config/pubip.go

@@ -50,7 +50,14 @@ func (p *PubIP) get(env params.Env) (warnings []string, err error) {
 	if err != nil {
 		return warnings, err
 	}
+
+	dnsTimeout, err := env.Duration("PUBLICIP_DNS_TIMEOUT", params.Default("3s"))
+	if err != nil {
+		return warnings, err
+	}
+
 	p.DNSSettings.Options = []dns.Option{
+		dns.SetTimeout(dnsTimeout),
 		dns.SetProviders(dnsIPProviders[0], dnsIPProviders[1:]...),
 	}