// when frps get one new user connection, send NoticeUserConn message to frpc and accept one new WorkConn later
func noticeUserConn(s *server.ProxyServer, msgSendChan chan interface{}) {
for {
closeFlag := s.WaitUserConn()
if closeFlag {
log.Debug("ProxyName [%s], goroutine for noticing user conn is closed", s.Name)
break
}
notice := &msg.ControlRes{
Type: consts.NoticeUserConn,
}
msgSendChan <- notice
log.Debug("ProxyName [%s], notice client to add work conn", s.Name)
}
}
// loop for sending messages from channel to frpc
func msgSender(s *server.ProxyServer, c *conn.Conn, msgSendChan chan interface{}) {
for {
msg, ok := <-msgSendChan
if !ok {
break
}
buf, _ := json.Marshal(msg)
err := c.Write(string(buf) + "\n")
if err != nil {
log.Warn("ProxyName [%s], write to client error, proxy exit", s.Name)
s.Close()
break
}
}
}
// loop for reading messages from frpc after control connection is established
func msgReader(s *server.ProxyServer, c *conn.Conn, msgSendChan chan interface{}) error {
// for heartbeat
var heartbeatTimeout bool = false
timer := time.AfterFunc(time.Duration(server.HeartBeatTimeout)*time.Second, func() {
heartbeatTimeout = true
s.Close()
log.Error("ProxyName [%s], client heartbeat timeout", s.Name)
})
defer timer.Stop()
for {
buf, err := c.ReadLine()
if err != nil {
if err == io.EOF {
log.Warn("ProxyName [%s], client is dead!", s.Name)
return err
} else if c == nil || c.IsClosed() {
log.Warn("ProxyName [%s], client connection is closed", s.Name)
return err
}
log.Warn("ProxyName [%s], read error: %v", s.Name, err)
continue
}
cliReq := &msg.ControlReq{}
if err := json.Unmarshal([]byte(buf), &cliReq); err != nil {
log.Warn("ProxyName [%s], parse msg from frpc error: %v : %s", s.Name, err, buf)
continue
}
switch cliReq.Type {
case consts.HeartbeatReq:
log.Debug("ProxyName [%s], get heartbeat", s.Name)
timer.Reset(time.Duration(server.HeartBeatTimeout) * time.Second)
heartbeatRes := &msg.ControlRes{
Type: consts.HeartbeatRes,
}
msgSendChan <- heartbeatRes
default:
log.Warn("ProxyName [%s}, unsupport msgType [%d]", s.Name, cliReq.Type)
}
}
return nil
}
// connection from every client and server
func controlWorker(c *conn.Conn) {
// if login message type is NewWorkConn, don't close this connection
var closeFlag bool = true
var s *server.ProxyServer
defer func() {
if closeFlag {
c.Close()
if s != nil {
s.Close()
}
}
}()
// get login message
buf, err := c.ReadLine()
if err != nil {
log.Warn("Read error, %v", err)
return
}
log.Debug("Get msg from frpc: %s", buf)
cliReq := &msg.ControlReq{}
if err := json.Unmarshal([]byte(buf), &cliReq); err != nil {
log.Warn("Parse msg from frpc error: %v : %s", err, buf)
return
}
// login when type is NewCtlConn or NewWorkConn
ret, info := doLogin(cliReq, c)
s, ok := server.ProxyServers[cliReq.ProxyName]
if !ok {
log.Warn("ProxyName [%s] is not exist", cliReq.ProxyName)
return
}
// if login type is NewWorkConn, nothing will be send to frpc
if cliReq.Type != consts.NewWorkConn {
cliRes := &msg.ControlRes{
Type: consts.NewCtlConnRes,
Code: ret,
Msg: info,
}
byteBuf, _ := json.Marshal(cliRes)
err = c.Write(string(byteBuf) + "\n")
if err != nil {
log.Warn("ProxyName [%s], write to client error, proxy exit", s.Name)
time.Sleep(1 * time.Second)
return
}
} else {
closeFlag = false
return
}
// if login failed, just return
if ret > 0 {
return
}
// create a channel for sending messages
msgSendChan := make(chan interface{}, 1024)
go msgSender(s, c, msgSendChan)
go noticeUserConn(s, msgSendChan)
// loop for reading control messages from frpc and deal with different types
msgReader(s, c, msgSendChan)
close(msgSendChan)
log.Info("ProxyName [%s], I'm dead!", s.Name)
return
}
// if success, ret equals 0, otherwise greater than 0
func doLogin(req *msg.ControlReq, c *conn.Conn) (ret int64, info string) {
ret = 1
if req.PrivilegeMode && !server.PrivilegeMode {
info = fmt.Sprintf("ProxyName [%s], PrivilegeMode is disabled in frps", req.ProxyName)
log.Warn("info")
return
}
var (
s *server.ProxyServer
ok bool
)
s, ok = server.ProxyServers[req.ProxyName]
if req.PrivilegeMode && req.Type == consts.NewCtlConn {
log.Debug("ProxyName [%s], doLogin and privilege mode is enabled", req.ProxyName)
} else {
if !ok {
info = fmt.Sprintf("ProxyName [%s] is not exist", req.ProxyName)
log.Warn(info)
return
}
}
// check authKey or privilegeKey
nowTime := time.Now().Unix()
if req.PrivilegeMode {
privilegeKey := pcrypto.GetAuthKey(req.ProxyName + server.PrivilegeToken + fmt.Sprintf("%d", req.Timestamp))
// privilegeKey avaiable in 15 minutes
if nowTime-req.Timestamp > 15*60 {
info = fmt.Sprintf("ProxyName [%s], privilege mode authorization timeout", req.ProxyName)
log.Warn(info)
return
} else if req.PrivilegeKey != privilegeKey {
info = fmt.Sprintf("ProxyName [%s], privilege mode authorization failed", req.ProxyName)
log.Warn(info)
return
}
} else {
authKey := pcrypto.GetAuthKey(req.ProxyName + s.AuthToken + fmt.Sprintf("%d", req.Timestamp))
// authKey avaiable in 15 minutes
if nowTime-req.Timestamp > 15*60 {
info = fmt.Sprintf("ProxyName [%s], authorization timeout", req.ProxyName)
log.Warn(info)
return
} else if req.AuthKey != authKey {
info = fmt.Sprintf("ProxyName [%s], authorization failed", req.ProxyName)
log.Warn(info)
return
}
}
// control conn
if req.Type == consts.NewCtlConn {
if req.PrivilegeMode {
s = server.NewProxyServerFromCtlMsg(req)
err := server.CreateProxy(s)
if err != nil {
info = fmt.Sprintf("ProxyName [%s], %v", req.ProxyName, err)
log.Warn(info)
return
}
}
if s.Status == consts.Working {
info = fmt.Sprintf("ProxyName [%s], already in use", req.ProxyName)
log.Warn(info)
return
}
// check if vhost_port is set
if s.Type == "http" && server.VhostHttpMuxer == nil {
info = fmt.Sprintf("ProxyName [%s], type [http] not support when vhost_http_port is not set", req.ProxyName)
log.Warn(info)
return
}
if s.Type == "https" && server.VhostHttpsMuxer == nil {
info = fmt.Sprintf("ProxyName [%s], type [https] not support when vhost_https_port is not set", req.ProxyName)
log.Warn(info)
return
}
// set infomations from frpc
s.UseEncryption = req.UseEncryption
s.UseGzip = req.UseGzip
// start proxy and listen for user connections, no block
err := s.Start(c)
if err != nil {
info = fmt.Sprintf("ProxyName [%s], start proxy error: %v", req.ProxyName, err)
log.Warn(info)
return
}
log.Info("ProxyName [%s], start proxy success", req.ProxyName)
if req.PrivilegeMode {
log.Info("ProxyName [%s], created by PrivilegeMode", req.ProxyName)
}
} else if req.Type == consts.NewWorkConn {
// work conn
if s.Status != consts.Working {
log.Warn("ProxyName [%s], is not working when it gets one new work connnection", req.ProxyName)
return
}
// the connection will close after join over
s.RegisterNewWorkConn(c)
} else {
info = fmt.Sprintf("Unsupport login message type [%d]", req.Type)
log.Warn("Unsupport login message type [%d]", req.Type)
return
}
ret = 0
return
}