fix: 添加relay日志

cmd/internal/transport/kcp_test.go

@@ -204,6 +204,55 @@ func TestKCPCloseIsIdempotent(t *testing.T) {
 	}
 }
 
+func TestResolveUDPListenConfigSelectsSocketFamily(t *testing.T) {
+	tests := []struct {
+		name        string
+		listenAddr  string
+		wantNetwork string
+		wantAddr    string
+	}{
+		{
+			name:        "ipv4 unspecified",
+			listenAddr:  "0.0.0.0:10909",
+			wantNetwork: "udp4",
+			wantAddr:    "0.0.0.0:10909",
+		},
+		{
+			name:        "ipv4 loopback",
+			listenAddr:  "127.0.0.1:10909",
+			wantNetwork: "udp4",
+			wantAddr:    "127.0.0.1:10909",
+		},
+		{
+			name:        "ipv6 loopback",
+			listenAddr:  "[::1]:10909",
+			wantNetwork: "udp6",
+			wantAddr:    "[::1]:10909",
+		},
+		{
+			name:        "host omitted",
+			listenAddr:  ":10909",
+			wantNetwork: "udp",
+			wantAddr:    ":10909",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotNetwork, gotAddr, err := ResolveUDPListenConfig(tt.listenAddr)
+			if err != nil {
+				t.Fatalf("ResolveUDPListenConfig(%q) error = %v", tt.listenAddr, err)
+			}
+			if gotNetwork != tt.wantNetwork {
+				t.Fatalf("network = %q, want %q", gotNetwork, tt.wantNetwork)
+			}
+			if gotAddr.String() != tt.wantAddr {
+				t.Fatalf("addr = %q, want %q", gotAddr.String(), tt.wantAddr)
+			}
+		})
+	}
+}
+
 func newKCPConnPair(t *testing.T, senderOpts []KCPOption, receiverOpts []KCPOption, senderPacketLogger KCPPacketDebugLogger, receiverPacketLogger KCPPacketDebugLogger) (*KCPConn, <-chan kcpAcceptResult, func()) {
 	t.Helper()