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Tobias GesellchenandClaude Opus 4.7
206ef1f665
The previous implementation silently returned the literal interface name when the interface existed but had no IPv4 address (or when listing addresses failed). That reproduces the exact error from #264 ("listen tcp: lookup eth103 on ...: no such host") for users on IPv6-only or admin-down interfaces, so the fix only worked for the happy path. Return an explicit error for those cases and fatal in main with a message that identifies the offending --bind value. Add an IPv6 fallback (single non-link-local address, bracketed) and treat any ambiguity -- multiple IPv4 or multiple IPv6 addresses on the same interface -- as an error rather than picking one silently. Log when an interface name was resolved to an IP so the indirection is visible. Update the --bind flag help text to reflect the supported inputs. Add a test covering the pass-through cases (host, IP, empty, unknown name) and a portable loopback-interface test that skips cleanly when the loopback isn't in a single-IPv4 configuration. Refs #264 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>