func (p *ProxyClient) GetRemoteConn(addr string, port int64) (c *conn.Conn, err error) {
defer func() {
if err != nil {
c.Close()
}
}()
c, err = conn.ConnectServer(addr, port)
if err != nil {
log.Error("ProxyName [%s], connect to server [%s:%d] error, %v", p.Name, addr, port, err)
return
}
nowTime := time.Now().Unix()
authKey := pcrypto.GetAuthKey(p.Name + p.AuthToken + fmt.Sprintf("%d", nowTime))
req := &msg.ControlReq{
Type: consts.NewWorkConn,
ProxyName: p.Name,
AuthKey: authKey,
Timestamp: nowTime,
}
buf, _ := json.Marshal(req)
err = c.Write(string(buf) + "\n")
if err != nil {
log.Error("ProxyName [%s], write to server error, %v", p.Name, err)
return
}
err = nil
return
}
// recvive msg from reader, then encrypt msg into write
func PipeEncrypt(r net.Conn, w net.Conn, key string) error {
laes := new(pcrypto.Pcrypto)
if err := laes.Init([]byte(key)); err != nil {
log.Error("Pcrypto Init error: %v", err)
return fmt.Errorf("Pcrypto Init error: %v", err)
}
nreader := bufio.NewReader(r)
buf := make([]byte, 10*1024)
for {
n, err := nreader.Read(buf)
if err != nil {
return err
}
res, err := laes.Encrypt(buf[:n])
if err != nil {
log.Error("Encrypt error: %v", err)
return fmt.Errorf("Encrypt error: %v", err)
}
res = append(res, '\n')
_, err = w.Write(res)
if err != nil {
return err
}
}
return nil
}
// decrypt msg from reader, then write into writer
func PipeDecrypt(r net.Conn, w net.Conn, key string) error {
laes := new(pcrypto.Pcrypto)
if err := laes.Init([]byte(key)); err != nil {
log.Error("Pcrypto Init error: %v", err)
return fmt.Errorf("Pcrypto Init error: %v", err)
}
nreader := bufio.NewReader(r)
for {
buf, err := nreader.ReadBytes('\n')
if err != nil {
return err
}
res, err := laes.Decrypt(buf)
if err != nil {
log.Error("Decrypt [%s] error, %v", string(buf), err)
return fmt.Errorf("Decrypt [%s] error: %v", string(buf), err)
}
_, err = w.Write(res)
if err != nil {
return err
}
}
return nil
}
func loginToServer(cli *client.ProxyClient) (c *conn.Conn, err error) {
c, err = conn.ConnectServer(client.ServerAddr, client.ServerPort)
if err != nil {
log.Error("ProxyName [%s], connect to server [%s:%d] error, %v", cli.Name, client.ServerAddr, client.ServerPort, err)
return
}
nowTime := time.Now().Unix()
req := &msg.ControlReq{
Type: consts.NewCtlConn,
ProxyName: cli.Name,
UseEncryption: cli.UseEncryption,
UseGzip: cli.UseGzip,
PrivilegeMode: cli.PrivilegeMode,
ProxyType: cli.Type,
Timestamp: nowTime,
}
if cli.PrivilegeMode {
privilegeKey := pcrypto.GetAuthKey(cli.Name + client.PrivilegeToken + fmt.Sprintf("%d", nowTime))
req.RemotePort = cli.RemotePort
req.CustomDomains = cli.CustomDomains
req.PrivilegeKey = privilegeKey
} else {
authKey := pcrypto.GetAuthKey(cli.Name + cli.AuthToken + fmt.Sprintf("%d", nowTime))
req.AuthKey = authKey
}
buf, _ := json.Marshal(req)
err = c.Write(string(buf) + "\n")
if err != nil {
log.Error("ProxyName [%s], write to server error, %v", cli.Name, err)
return
}
res, err := c.ReadLine()
if err != nil {
log.Error("ProxyName [%s], read from server error, %v", cli.Name, err)
return
}
log.Debug("ProxyName [%s], read [%s]", cli.Name, res)
ctlRes := &msg.ControlRes{}
if err = json.Unmarshal([]byte(res), &ctlRes); err != nil {
log.Error("ProxyName [%s], format server response error, %v", cli.Name, err)
return
}
if ctlRes.Code != 0 {
log.Error("ProxyName [%s], start proxy error, %s", cli.Name, ctlRes.Msg)
return c, fmt.Errorf("%s", ctlRes.Msg)
}
log.Debug("ProxyName [%s], connect to server [%s:%d] success!", cli.Name, client.ServerAddr, client.ServerPort)
return
}
// loop for reading messages from frpc after control connection is established
func msgReader(cli *client.ProxyClient, c *conn.Conn, msgSendChan chan interface{}) error {
// for heartbeat
var heartbeatTimeout bool = false
timer := time.AfterFunc(time.Duration(client.HeartBeatTimeout)*time.Second, func() {
heartbeatTimeout = true
c.Close()
log.Error("ProxyName [%s], heartbeatRes from frps timeout", cli.Name)
})
defer timer.Stop()
for {
buf, err := c.ReadLine()
if err == io.EOF || c == nil || c.IsClosed() {
c.Close()
log.Warn("ProxyName [%s], frps close this control conn!", cli.Name)
var delayTime time.Duration = 1
// loop until reconnect to frps
for {
log.Info("ProxyName [%s], try to reconnect to frps [%s:%d]...", cli.Name, client.ServerAddr, client.ServerPort)
c, err = loginToServer(cli)
if err == nil {
close(msgSendChan)
msgSendChan = make(chan interface{}, 1024)
go heartbeatSender(c, msgSendChan)
go msgSender(cli, c, msgSendChan)
break
}
if delayTime < 60 {
delayTime = delayTime * 2
}
time.Sleep(delayTime * time.Second)
}
continue
} else if err != nil {
log.Warn("ProxyName [%s], read from frps error: %v", cli.Name, err)
continue
}
ctlRes := &msg.ControlRes{}
if err := json.Unmarshal([]byte(buf), &ctlRes); err != nil {
log.Warn("ProxyName [%s], parse msg from frps error: %v : %s", cli.Name, err, buf)
continue
}
switch ctlRes.Type {
case consts.HeartbeatRes:
log.Debug("ProxyName [%s], receive heartbeat response", cli.Name)
timer.Reset(time.Duration(client.HeartBeatTimeout) * time.Second)
case consts.NoticeUserConn:
log.Debug("ProxyName [%s], new user connection", cli.Name)
// join local and remote connections, async
go cli.StartTunnel(client.ServerAddr, client.ServerPort)
default:
log.Warn("ProxyName [%s}, unsupport msgType [%d]", cli.Name, ctlRes.Type)
}
}
return nil
}
func (p *ProxyClient) GetLocalConn() (c *conn.Conn, err error) {
c, err = conn.ConnectServer(p.LocalIp, p.LocalPort)
if err != nil {
log.Error("ProxyName [%s], connect to local port error, %v", p.Name, err)
}
return
}
func apiReload(c *gin.Context) {
res := &GeneralResponse{}
defer func() {
buf, _ := json.Marshal(res)
log.Info("Http response [/api/reload]: %s", string(buf))
}()
log.Info("Http request: [/api/reload]")
err := ReloadConf(ConfigFile)
if err != nil {
res.Code = 2
res.Msg = fmt.Sprintf("%v", err)
log.Error("frps reload error: %v", err)
}
c.JSON(200, res)
}
// 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
}
func ControlProcess(cli *client.ProxyClient, wait *sync.WaitGroup) {
defer wait.Done()
msgSendChan := make(chan interface{}, 1024)
c, err := loginToServer(cli)
if err != nil {
log.Error("ProxyName [%s], connect to server failed!", cli.Name)
return
}
defer c.Close()
go heartbeatSender(c, msgSendChan)
go msgSender(cli, c, msgSendChan)
msgReader(cli, c, msgSendChan)
close(msgSendChan)
}
func main() {
// the configures parsed from file will be replaced by those from command line if exist
args, err := docopt.Parse(usage, nil, true, version.Full(), false)
if args["-c"] != nil {
server.ConfigFile = args["-c"].(string)
}
err = server.LoadConf(server.ConfigFile)
if err != nil {
fmt.Println(err)
os.Exit(-1)
}
// reload check
if args["--reload"] != nil {
if args["--reload"].(bool) {
resp, err := http.Get("http://" + server.BindAddr + ":" + fmt.Sprintf("%d", server.DashboardPort) + "/api/reload")
if err != nil {
fmt.Printf("frps reload error: %v\n", err)
os.Exit(1)
} else {
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("frps reload error: %v\n", err)
os.Exit(1)
}
res := &server.GeneralResponse{}
err = json.Unmarshal(body, &res)
if err != nil {
fmt.Printf("http response error: %v\n", err)
os.Exit(1)
} else if res.Code != 0 {
fmt.Printf("reload error: %s\n", res.Msg)
os.Exit(1)
}
fmt.Printf("reload success\n")
os.Exit(0)
}
}
}
if args["-L"] != nil {
if args["-L"].(string) == "console" {
server.LogWay = "console"
} else {
server.LogWay = "file"
server.LogFile = args["-L"].(string)
}
}
if args["--log-level"] != nil {
server.LogLevel = args["--log-level"].(string)
}
if args["--addr"] != nil {
addr := strings.Split(args["--addr"].(string), ":")
if len(addr) != 2 {
fmt.Println("--addr format error: example 0.0.0.0:7000")
os.Exit(1)
}
bindPort, err := strconv.ParseInt(addr[1], 10, 64)
if err != nil {
fmt.Println("--addr format error, example 0.0.0.0:7000")
os.Exit(1)
}
server.BindAddr = addr[0]
server.BindPort = bindPort
}
if args["-v"] != nil {
if args["-v"].(bool) {
fmt.Println(version.Full())
os.Exit(0)
}
}
log.InitLog(server.LogWay, server.LogFile, server.LogLevel, server.LogMaxDays)
l, err := conn.Listen(server.BindAddr, server.BindPort)
if err != nil {
log.Error("Create server listener error, %v", err)
os.Exit(1)
}
// create vhost if VhostHttpPort != 0
if server.VhostHttpPort != 0 {
vhostListener, err := conn.Listen(server.BindAddr, server.VhostHttpPort)
if err != nil {
log.Error("Create vhost http listener error, %v", err)
os.Exit(1)
}
server.VhostMuxer, err = vhost.NewHttpMuxer(vhostListener, 30*time.Second)
if err != nil {
log.Error("Create vhost httpMuxer error, %v", err)
}
}
// create dashboard web server if DashboardPort is set, so it won't be 0
if server.DashboardPort != 0 {
err := server.RunDashboardServer(server.BindAddr, server.DashboardPort)
if err != nil {
log.Error("Create dashboard web server error, %v", err)
os.Exit(1)
}
}
log.Info("Start frps success")
ProcessControlConn(l)
}