func (c *wsClient) handlerControlMessage(bFrame []byte) error {
msg := ctrl.WebSocketControlFrame{}
if err := json.Unmarshal(bFrame, &msg); err != nil {
log.Warn("Recve a Text-Frame not JSON format. err=%v, frame=%v", err.Error(), string(bFrame))
return err
}
log.Debug("TCP[%v] Get Frame T[%v], Content=%v, index=%v, ", c, msg.TypeStr(), msg.Content, msg.Index)
switch msg.Type {
case ctrl.Msg_Request_Finish:
c.closeWriter()
case ctrl.Msg_Client_Busy:
c.writerForward.Write([]byte("current client was busy, pls try anthor."))
c.closeWriter()
case ctrl.Msg_Sys_Err:
c.writerForward.Write([]byte(msg.Content))
c.closeWriter()
case ctrl.Msg_Get_Config:
log.Info("Get the Client- side local network server config[%s]", msg.Content)
pConfig.client_conf_forward_host = msg.Content
default:
log.Warn("no handler Msg T[%s]", msg.TypeStr())
}
return nil
}
func WebsocketHandler(w http.ResponseWriter, r *http.Request) {
log.Info("WebsocketHandler:%s %s %s", r.RemoteAddr, r.Method, r.URL.Path)
if !authOK(r) {
log.Warn("auth fail....")
noAuthResponse(w)
return
}
var conn *websocket.Conn
conn, err := websocket.Upgrade(w, r, http.Header{})
if err != nil {
log.Error(err.Error())
return
}
conn.SetReadDeadline(time.Time{})
conn.SetWriteDeadline(time.Time{})
var client = newWebsocketClient(conn, r)
if pConfig.client_conf_forward_host == "" {
log.Info("pConfig.client_conf_forward_host is empty. tell Client Need the Config.")
client.tellClientNeedConfig()
}
log.Info("Put[%s] into the global Connect pool.", client)
client.waitForFrameLoop()
websocketClose(r)
log.Debug("WebsocketHandler:%s closed.", r.RemoteAddr)
}
func ListenIPForwardAndWebsocketServ(forwardHostAndPort, websocketHostAndPort string, conf *Config) {
if conf == nil {
panic("config is nil.")
}
pConfig = conf
if pConfig.Auth != "" {
pConfig.Auth = fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(pConfig.Auth)))
}
go listenWebsocketServ(websocketHostAndPort, ctrl.WEBSOCKET_CONNECT_URI, WEBSOCKET_CONTORL_URI)
l, err := net.Listen("tcp", forwardHostAndPort)
if err != nil {
log.Error(err.Error())
}
defer l.Close()
log.Debug("IP Forward Listening TCP[%s]", forwardHostAndPort)
for {
conn, err := l.Accept()
if err != nil {
log.Error("IP-Forward Accept err=%s", err.Error())
continue
}
// handle socket data recv and send
go ipforward(conn)
}
log.Info("ListenAndIPForwardServ exit.")
}
func (client *wsClient) waitForFrameLoop() {
for {
frameType, bFrame, err := client.websocket.Read()
log.Debug("TCP[%s] recv WebSocket Frame typ=[%v] size=[%d], crc32=[%d]",
client, frameTypStr(frameType), len(bFrame), crc32.ChecksumIEEE(bFrame))
if err != nil {
if err != io.ErrUnexpectedEOF {
log.Error("TCP[%s] close Unexpected err=%v", client, err.Error())
} else {
log.Debug("TCP[%s] close the socket. EOF.", client)
}
client.closeWriter()
return
}
switch frameType {
case websocket.TextMessage:
client.handlerControlMessage(bFrame)
case websocket.CloseMessage:
log.Info("TCP[%s] close Frame revced. end wait Frame loop", client)
client.closeWriter()
return
case websocket.BinaryMessage:
log.Info("TCP[%s] resv-binary: %v", client, len(bFrame))
if client.writerForward == nil {
log.Warn("client.writerForward is nil.")
continue
}
_, err := client.writerForward.Write(bFrame)
if err != nil {
if err != io.EOF {
log.Error(err.Error())
}
client.tellClientRequestFinish()
client.closeWriter()
}
case websocket.PingMessage, websocket.PongMessage: // IE-11 会无端端发一个pong上来
client.websocket.Pong(bFrame)
default:
log.Warn("TODO: revce frame-type=%v. can not handler. content=%v", frameTypStr(frameType), string(bFrame))
}
}
}
func (client *Client) waitForCommand() {
for {
frameType, bFrame, err := client.webSocket.Read()
log.Debug("TCP[%s] recv WebSocket Frame typ=[%v] size=[%d], crc32=[%d]",
client, frameTypStr(frameType), len(bFrame), crc32.ChecksumIEEE(bFrame))
if err != nil {
if err != io.ErrUnexpectedEOF {
log.Error("TCP[%s] close Unexpected err=%v", client, err.Error())
} else {
log.Debug("TCP[%s] close the socket. EOF.", client)
}
client.closeLocalConnect()
return
}
switch frameType {
case websocket.CloseMessage:
log.Info("TCP[%s] close Frame revced. end wait Frame loop", client)
client.closeLocalConnect()
return
case websocket.TextMessage:
err := client.handlerControlFrame(bFrame)
if err != nil {
log.Error("handlerControlFrame ret[%s]", err.Error())
}
case websocket.BinaryMessage:
log.Info("put Binary-Data to chan-len[%d]", len(client.forwardData))
select {
case client.forwardData <- bFrame:
log.Info("put frame to client.forwardData len[%d] end", len(client.forwardData))
default:
log.Warn("[%s] is busy", client)
client.tellServBusy()
}
case websocket.PingMessage, websocket.PongMessage: // IE-11 会无端端发一个pong上来
client.webSocket.Pong(bFrame)
default:
log.Warn("TODO: revce frame-type=%v. can not handler. content=%v", frameTypStr(frameType), string(bFrame))
}
}
}
func ipforward(c net.Conn) {
//只支持 TCP 协议的 Forward，如http,ssh
log.Debug("new connect [%s]", c.RemoteAddr())
defer c.Close()
err := bindConnection(c)
if err != nil {
c.Write([]byte(err.Error())) //c maybe closed.
log.Error("Forward PutConnection err=%s", err.Error())
}
}
func authOK(req *http.Request) bool {
if pConfig == nil && pConfig.Auth == "" {
log.Info("did not need auth.")
return true
}
var auth = req.Header.Get("Authorization")
log.Debug("reuquest Auth->[%s]", auth)
return auth == pConfig.Auth
}