func JoinSession(invitation protocol.SessionInvitation) (net.Conn, error) {
addr := net.JoinHostPort(net.IP(invitation.Address).String(), strconv.Itoa(int(invitation.Port)))
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
request := protocol.JoinSessionRequest{
Key: invitation.Key,
}
conn.SetDeadline(time.Now().Add(10 * time.Second))
err = protocol.WriteMessage(conn, request)
if err != nil {
return nil, err
}
message, err := protocol.ReadMessage(conn)
if err != nil {
return nil, err
}
conn.SetDeadline(time.Time{})
switch msg := message.(type) {
case protocol.Response:
if msg.Code != 0 {
return nil, fmt.Errorf("Incorrect response code %d: %s", msg.Code, msg.Message)
}
return conn, nil
default:
return nil, fmt.Errorf("protocol error: expecting response got %v", msg)
}
}
func sessionConnectionHandler(conn net.Conn) {
if err := conn.SetDeadline(time.Now().Add(messageTimeout)); err != nil {
if debug {
log.Println("Weird error setting deadline:", err, "on", conn.RemoteAddr())
}
return
}
message, err := protocol.ReadMessage(conn)
if err != nil {
return
}
switch msg := message.(type) {
case protocol.JoinSessionRequest:
ses := findSession(string(msg.Key))
if debug {
log.Println(conn.RemoteAddr(), "session lookup", ses)
}
if ses == nil {
protocol.WriteMessage(conn, protocol.ResponseNotFound)
conn.Close()
return
}
if !ses.AddConnection(conn) {
if debug {
log.Println("Failed to add", conn.RemoteAddr(), "to session", ses)
}
protocol.WriteMessage(conn, protocol.ResponseAlreadyConnected)
conn.Close()
return
}
if err := protocol.WriteMessage(conn, protocol.ResponseSuccess); err != nil {
if debug {
log.Println("Failed to send session join response to ", conn.RemoteAddr(), "for", ses)
}
return
}
if err := conn.SetDeadline(time.Time{}); err != nil {
if debug {
log.Println("Weird error setting deadline:", err, "on", conn.RemoteAddr())
}
conn.Close()
return
}
default:
if debug {
log.Println("Unexpected message from", conn.RemoteAddr(), message)
}
protocol.WriteMessage(conn, protocol.ResponseUnexpectedMessage)
conn.Close()
}
}
func messageReader(conn net.Conn, messages chan<- interface{}, errors chan<- error) {
for {
msg, err := protocol.ReadMessage(conn)
if err != nil {
errors <- err
return
}
messages <- msg
}
}
func messageReader(conn net.Conn, messages chan<- interface{}, errors chan<- error) {
atomic.AddInt64(&numConnections, 1)
defer atomic.AddInt64(&numConnections, -1)
for {
msg, err := protocol.ReadMessage(conn)
if err != nil {
errors <- err
return
}
messages <- msg
}
}
func GetInvitationFromRelay(uri *url.URL, id syncthingprotocol.DeviceID, certs []tls.Certificate) (protocol.SessionInvitation, error) {
if uri.Scheme != "relay" {
return protocol.SessionInvitation{}, fmt.Errorf("Unsupported relay scheme:", uri.Scheme)
}
conn, err := tls.Dial("tcp", uri.Host, configForCerts(certs))
if err != nil {
return protocol.SessionInvitation{}, err
}
conn.SetDeadline(time.Now().Add(10 * time.Second))
if err := performHandshakeAndValidation(conn, uri); err != nil {
return protocol.SessionInvitation{}, err
}
defer conn.Close()
request := protocol.ConnectRequest{
ID: id[:],
}
if err := protocol.WriteMessage(conn, request); err != nil {
return protocol.SessionInvitation{}, err
}
message, err := protocol.ReadMessage(conn)
if err != nil {
return protocol.SessionInvitation{}, err
}
switch msg := message.(type) {
case protocol.Response:
return protocol.SessionInvitation{}, fmt.Errorf("Incorrect response code %d: %s", msg.Code, msg.Message)
case protocol.SessionInvitation:
if debug {
l.Debugln("Received invitation", msg, "via", conn.LocalAddr())
}
ip := net.IP(msg.Address)
if len(ip) == 0 || ip.IsUnspecified() {
msg.Address = conn.RemoteAddr().(*net.TCPAddr).IP[:]
}
return msg, nil
default:
return protocol.SessionInvitation{}, fmt.Errorf("protocol error: unexpected message %v", msg)
}
}
func (c *ProtocolClient) join() error {
if err := protocol.WriteMessage(c.conn, protocol.JoinRelayRequest{}); err != nil {
return err
}
message, err := protocol.ReadMessage(c.conn)
if err != nil {
return err
}
switch msg := message.(type) {
case protocol.Response:
if msg.Code != 0 {
return fmt.Errorf("Incorrect response code %d: %s", msg.Code, msg.Message)
}
default:
return fmt.Errorf("protocol error: expecting response got %v", msg)
}
return nil
}