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Fixup [::]:port socket trying to send to v4

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This commit is contained in:
Riccardo Manfrin
2026-05-13 09:48:53 +02:00
parent 459f961a0b
commit 7af9f960d1
1 changed files with 9 additions and 0 deletions
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9
client/internal/rosenpass/manager.go
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@@ -79,6 +79,15 @@ func (m *Manager) addPeer(rosenpassPubKey []byte, rosenpassAddr string, wireGuar
if pcfg.Endpoint, err = net.ResolveUDPAddr("udp", peerAddr); err != nil {
return fmt.Errorf("failed to resolve peer endpoint address: %w", err)
}
// Our local Rosenpass UDP server binds on the IPv6 wildcard ([::]) — see
// GetAddress(). The remote peer's endpoint (pcfg.Endpoint) is the destination
// our server will sendto when initiating handshakes. ResolveUDPAddr returns a
// 4-byte IPv4 for IPv4 hosts, which the kernel rejects (EDESTADDRREQ) when
// sent from an AF_INET6 socket. Normalize the remote endpoint to IPv4-mapped
// IPv6 so its address family matches our listening socket.
if v4 := pcfg.Endpoint.IP.To4(); v4 != nil {
pcfg.Endpoint.IP = v4.To16()
}
}
peerID, err := m.server.AddPeer(pcfg)
if err != nil {