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feat(client): re-resolve the server hostnames at the DNS TTL

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hbc, hbc_mini.py and hbc_mini.c resolved the server once at startup, so an
address change needed a client restart. They now re-resolve every TTL seconds
(smallest A/AAAA TTL, floor 30s, 300s when unknown) and re-point, add or drop
connections to follow the new addresses; a failed lookup keeps the current ones.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
andreas
2026-10-28 04:23:55 -04:00
co-authored by Claude Sonnet 5.5
parent e8d9c4a958
commit 885d5dc937
9 changed files with 887 additions and 1 deletions
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README.md
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@@ -242,6 +242,7 @@ plugins:
### Connection behaviour
- The client sends heartbeats over UDP to each server address resolved from the hostname (IPv4 and IPv6).
- The server hostname is re-resolved every TTL seconds (the smallest A/AAAA TTL, at least 30s; 300s when the TTL cannot be determined, e.g. an IP literal), so an address change is followed without restarting the client. A failed lookup keeps the current addresses.
- If a connection fails to open at startup, IPv6 connections are dropped after 3 consecutive failures. IPv4 connections retry indefinitely.
- In daemon mode (`-d`), all log output goes to syslog (`LOG_DAEMON` facility).