func listenConnect(myID protocol.NodeID, m *model.Model, tlsCfg *tls.Config) {
var conns = make(chan *tls.Conn)
// Listen
for _, addr := range cfg.Options.ListenAddress {
go listenTLS(conns, addr, tlsCfg)
}
// Connect
go dialTLS(m, conns, tlsCfg)
next:
for conn := range conns {
certs := conn.ConnectionState().PeerCertificates
if cl := len(certs); cl != 1 {
l.Infof("Got peer certificate list of length %d != 1 from %s; protocol error", cl, conn.RemoteAddr())
conn.Close()
continue
}
remoteCert := certs[0]
remoteID := protocol.NewNodeID(remoteCert.Raw)
if remoteID == myID {
l.Infof("Connected to myself (%s) - should not happen", remoteID)
conn.Close()
continue
}
if m.ConnectedTo(remoteID) {
l.Infof("Connected to already connected node (%s)", remoteID)
conn.Close()
continue
}
for _, nodeCfg := range cfg.Nodes {
if nodeCfg.NodeID == remoteID {
// Verify the name on the certificate. By default we set it to
// "syncthing" when generating, but the user may have replaced
// the certificate and used another name.
certName := nodeCfg.CertName
if certName == "" {
certName = "syncthing"
}
err := remoteCert.VerifyHostname(certName)
if err != nil {
// Incorrect certificate name is something the user most
// likely wants to know about, since it's an advanced
// config. Warn instead of Info.
l.Warnf("Bad certificate from %s (%v): %v", remoteID, conn.RemoteAddr(), err)
conn.Close()
continue next
}
// If rate limiting is set, we wrap the write side of the
// connection in a limiter.
var wr io.Writer = conn
if rateBucket != nil {
wr = &limitedWriter{conn, rateBucket}
}
name := fmt.Sprintf("%s-%s", conn.LocalAddr(), conn.RemoteAddr())
protoConn := protocol.NewConnection(remoteID, conn, wr, m, name, nodeCfg.Compression)
l.Infof("Established secure connection to %s at %s", remoteID, name)
if debugNet {
l.Debugf("cipher suite %04X", conn.ConnectionState().CipherSuite)
}
events.Default.Log(events.NodeConnected, map[string]string{
"id": remoteID.String(),
"addr": conn.RemoteAddr().String(),
})
m.AddConnection(conn, protoConn)
continue next
}
}
events.Default.Log(events.NodeRejected, map[string]string{
"node": remoteID.String(),
"address": conn.RemoteAddr().String(),
})
l.Infof("Connection from %s with unknown node ID %s; ignoring", conn.RemoteAddr(), remoteID)
conn.Close()
}
}
