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## Describe your changes Removes redundant `Login` RPCs from the iOS SDK bindings. ## Issue ticket number and link ## Stack <!-- branch-stack --> ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) - [ ] This change does **not** modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — **OR** I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See [CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first). > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__ <!-- codesmith:footer --> --- <a href="https://app.blacksmith.sh/netbirdio/codesmith/netbird/pr/6931"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-light-v2.svg"><img alt="View with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"></picture></a> <a href="https://backend.blacksmith.sh/track/enable-autofix?expires=1787779607&installation_model_id=427504&pr_number=6931&repository=netbirdio%2Fnetbird&return_to=https%3A%2F%2Fgithub.com%2Fnetbirdio%2Fnetbird%2Fpull%2F6931&signature=ce1631be2a5ffdba58c44b4669b0d480dc9f956102cf10a0c7b5845a800cdc68"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-light.svg"><img alt="Autofix with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"></picture></a> <sup>Need help on this PR? Tag <code>@codesmith-bot</code> with what you need. Autofix is disabled.</sup> <!-- codesmith:autofix:disabled --> <!-- /codesmith:footer --> <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added an interactive iOS login option that starts authentication directly when needed. * Improved login flow handling, including clearer error reporting and successful-login notifications. * Login configuration is now saved automatically after successful authentication when applicable. * **Bug Fixes** * Prevented duplicate login requests during iOS startup. * Improved startup behavior and error propagation when the management service is unavailable. <!-- end of auto-generated comment: release notes by coderabbit.ai --> Removes redundant `Login` RPCs from the iOS SDK bindings. Both changed files are behind the `ios` build tag — Android, desktop and the shared core are not affected. ### Problem `auth.Auth.IsLoginRequired()` is not a cheap probe: it calls `doMgmLogin()` and classifies the resulting error, so every "is login required?" check costs a **full `Login` RPC**. There is no lighter way to ask. As a result the iOS client issued ~7 `Login` requests before the first `Sync`, where Android issues ~3, and the extra ones were indistinguishable from real logins in the management logs. Three of those came from this package: 1. `Run()` called `LoginSync()` before starting the engine, which performs `IsLoginRequired` **and** `Login` — two RPCs. This duplicated the engine's own `loginToManagement` (`client/internal/connect.go`), which runs immediately before the first `Sync` and is the authoritative login. The `Login(ctx, "", "")` inside `LoginSync` could not even establish anything: with an empty setup key and empty JWT, a registration attempt fails by construction, so it was a pure check. 2. `Auth.login()` called `IsLoginRequired()` again before opening the browser, even when the caller had already determined that login is needed. This is not only wasted traffic: - **It pushes peers toward the server-side login ban.** In `management/internals/shared/grpc/loginfilter.go`, every login with unchanged metadata increments `sessionCounter`, and exceeding `reconnLimitForBan` (30) within `reconnThreshold` (5 min) bans the peer for `baseBlockDuration` (10 min), doubling on repeat. Redundant logins carry identical metadata, so they count against exactly this budget. At 7 logins per connect the budget is exhausted after ~4 reconnects instead of ~10 — reachable on flaky mobile networks. - **Each redundant check is a potential 2-minute stall.** `IsLoginRequired` retries with backoff up to `MaxElapsedTime` (2 min) and returns `true` on failure, so an unreachable server was reported as "login required" rather than as a timeout, and the `LoginSync` pre-flight could abort engine startup on that basis. ### Changes **`client/ios/NetBirdSDK/client.go`** — `Run()` no longer performs the `LoginSync()` pre-flight. The engine's `loginToManagement` remains the single authoritative login. **`client/ios/NetBirdSDK/login.go`** — new exported `LoginInteractive`, which skips the `IsLoginRequired()` pre-flight and goes straight to the browser / device-code flow, for callers that have already established login is required. `LoginWithDeviceName` keeps the check for callers where the auth state is unknown (tvOS). Both now delegate to a shared `startLogin()`. ### Why this is safe An expired or revoked session still fails the connection, one step later and through a single path: `loginToManagement` returns `PermissionDenied` → the deferred `MarkManagementDisconnected` records it on the shared status recorder → `ClientStop` fires the listener's disconnect callback, where `IsLoginRequiredCached()` reports login-required → the client tears the tunnel down. The error is also returned out of `Run()`. Where the server is unreachable, the engine now retries with backoff and recovers on its own instead of aborting the start. Co-authored-by: Zoltan Papp <zoltan.pmail@gmail.com>
