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Tobias GesellchenandClaude Opus 4.7
cb071c9b1b
On a multi-homed host the discovery layer used to walk net.Interfaces()
and pick the first non-loopback IPv4 NIC, while UPnP/SSDP bound a
wildcard UDP socket and let the kernel route the multicast send. That
meant --bind on soundtouch-web only moved the HTTP listener; the
discovery still went out whatever interface the kernel preferred (often
the wrong one on hosts where the speakers sit behind a secondary NIC).
Introduce a separate DiscoveryInterface knob:
* pkg/config: DiscoveryInterface field + DISCOVERY_INTERFACE env var.
* pkg/discovery/mdns: NewMDNSDiscoveryServiceWithInterface; the
interface resolver now honours an explicit name and validates it
has a usable IPv4 address before handing it to hashicorp/mdns.
* pkg/discovery/upnp: when an interface is configured, bind the UDP
socket's source IP to the NIC's IPv4 and call
ipv4.PacketConn.SetMulticastInterface so M-SEARCH leaves the right
NIC. Without an interface, behaviour is unchanged.
* cmd/soundtouch-web: new --interface flag (DISCOVERY_INTERFACE env)
plumbed into the config before the discovery service is built.
go.mod/go.sum reflect promoting golang.org/x/net from indirect to a
direct dependency (now imported for ipv4.PacketConn).
Refs #264.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>