wireguard: check FQDN updates of peers on error - #3486
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We mistakenly believed that `libresolv`'s `search` function worked correctly in NetworkExtension, but it seems only `getaddrinfo` does. This commit changes the behavior of the `local` DNS server in NetworkExtension to prefer DHCP, falling back to `getaddrinfo` if DHCP servers are unavailable. It's worth noting that `prefer_go` does not disable DHCP since it respects Dial Fields, but `getaddrinfo` does the opposite. The new behavior only applies to NetworkExtension, not to all scenarios (primarily command-line binaries) as it did previously. In addition, this commit also improves the DHCP DNS server to use the same robust query logic as `local`.
We do not have the `com.apple.developer.networking.multicast` entitlement and are unable to obtain it for non-technical reasons.
…for local DNS server
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When the WireGuard works with DDNS, IP changes will cause the node to lose connection, which can be restored only by restarting
sing-box.This PR adds logic for updating DNS in the event of a connection error, and also throttling to ensure that resolution and updates are not triggered too often.