/**
* Establishes and manages a tunnel proxy connection with the server
*/
func proxy(proxyAddr string, s *State, ctl *ui.Controller) {
start := time.Now()
remoteConn, err := conn.Dial(proxyAddr, "pxy", tlsConfig)
if err != nil {
// XXX: What is the proper response here?
// display something to the user?
// retry?
// reset control connection?
log.Error("Failed to establish proxy connection: %v", err)
return
}
defer remoteConn.Close()
err = msg.WriteMsg(remoteConn, &msg.RegProxyMsg{Url: s.publicUrl})
if err != nil {
// XXX: What is the proper response here?
// display something to the user?
// retry?
// reset control connection?
log.Error("Failed to write RegProxyMsg: %v", err)
return
}
localConn, err := conn.Dial(s.opts.localaddr, "prv", nil)
if err != nil {
remoteConn.Warn("Failed to open private leg %s: %v", s.opts.localaddr, err)
badGatewayBody := fmt.Sprintf(BadGateway, s.publicUrl, s.opts.localaddr, s.opts.localaddr)
remoteConn.Write([]byte(fmt.Sprintf(`HTTP/1.0 502 Bad Gateway
Content-Type: text/html
Content-Length: %d
%s`, len(badGatewayBody), badGatewayBody)))
return
}
defer localConn.Close()
m := s.metrics
m.proxySetupTimer.Update(time.Since(start))
m.connMeter.Mark(1)
ctl.Update(s)
m.connTimer.Time(func() {
localConn := s.protocol.WrapConn(localConn)
bytesIn, bytesOut := conn.Join(localConn, remoteConn)
m.bytesIn.Update(bytesIn)
m.bytesOut.Update(bytesOut)
m.bytesInCount.Inc(bytesIn)
m.bytesOutCount.Inc(bytesOut)
})
ctl.Update(s)
}
// mvc.Model interface
func (c *ClientModel) PlayRequest(tunnel mvc.Tunnel, payload []byte) {
var localConn conn.Conn
localConn, err := conn.Dial(tunnel.LocalAddr, "prv", nil)
if err != nil {
c.Warn("Failed to open private leg to %s: %v", tunnel.LocalAddr, err)
return
}
defer localConn.Close()
localConn = tunnel.Protocol.WrapConn(localConn, mvc.ConnectionContext{Tunnel: tunnel, ClientAddr: "127.0.0.1"})
localConn.Write(payload)
ioutil.ReadAll(localConn)
}
// Establishes and manages a tunnel proxy connection with the server
func (c *ClientModel) proxy() {
var (
remoteConn conn.Conn
err error
)
if c.proxyUrl == "" {
remoteConn, err = conn.Dial(c.serverAddr, "pxy", c.tlsConfig)
} else {
remoteConn, err = conn.DialHttpProxy(c.proxyUrl, c.serverAddr, "pxy", c.tlsConfig)
}
if err != nil {
log.Error("Failed to establish proxy connection: %v", err)
return
}
defer remoteConn.Close()
err = msg.WriteMsg(remoteConn, &msg.RegProxy{ClientId: c.id})
if err != nil {
remoteConn.Error("Failed to write RegProxy: %v", err)
return
}
// wait for the server to ack our register
var startPxy msg.StartProxy
if err = msg.ReadMsgInto(remoteConn, &startPxy); err != nil {
remoteConn.Error("Server failed to write StartProxy: %v", err)
return
}
tunnel, ok := c.tunnels[startPxy.Url]
if !ok {
remoteConn.Error("Couldn't find tunnel for proxy: %s", startPxy.Url)
return
}
// start up the private connection
start := time.Now()
localConn, err := conn.Dial(tunnel.LocalAddr, "prv", nil)
if err != nil {
remoteConn.Warn("Failed to open private leg %s: %v", tunnel.LocalAddr, err)
if tunnel.Protocol.GetName() == "http" {
// try to be helpful when you're in HTTP mode and a human might see the output
badGatewayBody := fmt.Sprintf(BadGateway, tunnel.PublicUrl, tunnel.LocalAddr, tunnel.LocalAddr)
remoteConn.Write([]byte(fmt.Sprintf(`HTTP/1.0 502 Bad Gateway
Content-Type: text/html
Content-Length: %d
%s`, len(badGatewayBody), badGatewayBody)))
}
return
}
defer localConn.Close()
m := c.metrics
m.proxySetupTimer.Update(time.Since(start))
m.connMeter.Mark(1)
c.update()
m.connTimer.Time(func() {
localConn := tunnel.Protocol.WrapConn(localConn, mvc.ConnectionContext{Tunnel: tunnel, ClientAddr: startPxy.ClientAddr})
bytesIn, bytesOut := conn.Join(localConn, remoteConn)
m.bytesIn.Update(bytesIn)
m.bytesOut.Update(bytesOut)
m.bytesInCount.Inc(bytesIn)
m.bytesOutCount.Inc(bytesOut)
})
c.update()
}
// Establishes and manages a tunnel control connection with the server
func (c *ClientModel) control() {
defer func() {
if r := recover(); r != nil {
log.Error("control recovering from failure %v", r)
}
}()
// establish control channel
var (
ctlConn conn.Conn
err error
)
if c.proxyUrl == "" {
// simple non-proxied case, just connect to the server
ctlConn, err = conn.Dial(c.serverAddr, "ctl", c.tlsConfig)
} else {
ctlConn, err = conn.DialHttpProxy(c.proxyUrl, c.serverAddr, "ctl", c.tlsConfig)
}
if err != nil {
panic(err)
}
defer ctlConn.Close()
// authenticate with the server
auth := &msg.Auth{
ClientId: c.id,
OS: runtime.GOOS,
Arch: runtime.GOARCH,
Version: version.Proto,
MmVersion: version.MajorMinor(),
User: c.authToken,
}
if err = msg.WriteMsg(ctlConn, auth); err != nil {
panic(err)
}
// wait for the server to authenticate us
var authResp msg.AuthResp
if err = msg.ReadMsgInto(ctlConn, &authResp); err != nil {
panic(err)
}
if authResp.Error != "" {
emsg := fmt.Sprintf("Failed to authenticate to server: %s", authResp.Error)
c.ctl.Shutdown(emsg)
return
}
c.id = authResp.ClientId
c.serverVersion = authResp.MmVersion
c.Info("Authenticated with server, client id: %v", c.id)
c.update()
if err = SaveAuthToken(c.configPath, c.authToken); err != nil {
c.Error("Failed to save auth token: %v", err)
}
// request tunnels
reqIdToTunnelConfig := make(map[string]*TunnelConfiguration)
for _, config := range c.tunnelConfig {
// create the protocol list to ask for
var protocols []string
for proto, _ := range config.Protocols {
protocols = append(protocols, proto)
}
reqTunnel := &msg.ReqTunnel{
ReqId: util.RandId(8),
Protocol: strings.Join(protocols, "+"),
Hostname: config.Hostname,
Subdomain: config.Subdomain,
HttpAuth: config.HttpAuth,
RemotePort: config.RemotePort,
}
// send the tunnel request
if err = msg.WriteMsg(ctlConn, reqTunnel); err != nil {
panic(err)
}
// save request id association so we know which local address
// to proxy to later
reqIdToTunnelConfig[reqTunnel.ReqId] = config
}
// start the heartbeat
lastPong := time.Now().UnixNano()
c.ctl.Go(func() { c.heartbeat(&lastPong, ctlConn) })
// main control loop
for {
var rawMsg msg.Message
if rawMsg, err = msg.ReadMsg(ctlConn); err != nil {
panic(err)
}
switch m := rawMsg.(type) {
case *msg.ReqProxy:
c.ctl.Go(c.proxy)
case *msg.Pong:
atomic.StoreInt64(&lastPong, time.Now().UnixNano())
case *msg.NewTunnel:
if m.Error != "" {
emsg := fmt.Sprintf("Server failed to allocate tunnel: %s", m.Error)
c.Error(emsg)
c.ctl.Shutdown(emsg)
continue
}
tunnel := mvc.Tunnel{
PublicUrl: m.Url,
LocalAddr: reqIdToTunnelConfig[m.ReqId].Protocols[m.Protocol],
Protocol: c.protoMap[m.Protocol],
}
c.tunnels[tunnel.PublicUrl] = tunnel
c.connStatus = mvc.ConnOnline
c.Info("Tunnel established at %v", tunnel.PublicUrl)
c.update()
default:
ctlConn.Warn("Ignoring unknown control message %v ", m)
}
}
}
func Main() {
// parse options
opts := parseArgs()
// set up logging
log.LogTo(opts.logto)
// set up auth token
if opts.authtoken == "" {
opts.authtoken = LoadAuthToken()
}
// init client state
s := &State{
status: "connecting",
// unique client id
id: util.RandIdOrPanic(8),
// command-line options
opts: opts,
// metrics
metrics: NewClientMetrics(),
}
switch opts.protocol {
case "http":
s.protocol = proto.NewHttp()
case "tcp":
s.protocol = proto.NewTcp()
}
// init ui
ctl := ui.NewController()
if opts.webport != -1 {
web.NewWebView(ctl, s, opts.webport)
}
if opts.logto != "stdout" {
term.New(ctl, s)
}
go reconnectingControl(s, ctl)
go autoUpdate(s, ctl, opts.authtoken)
quitMessage := ""
ctl.Wait.Add(1)
go func() {
defer ctl.Wait.Done()
for {
select {
case obj := <-ctl.Cmds:
switch cmd := obj.(type) {
case ui.CmdQuit:
quitMessage = cmd.Message
ctl.DoShutdown()
return
case ui.CmdRequest:
go func() {
var localConn conn.Conn
localConn, err := conn.Dial(s.opts.localaddr, "prv", nil)
if err != nil {
log.Warn("Failed to open private leg %s: %v", s.opts.localaddr, err)
return
}
//defer localConn.Close()
localConn = s.protocol.WrapConn(localConn)
localConn.Write(cmd.Payload)
ioutil.ReadAll(localConn)
}()
}
}
}
}()
ctl.Wait.Wait()
fmt.Println(quitMessage)
}
/**
* Establishes and manages a tunnel control connection with the server
*/
func control(s *State, ctl *ui.Controller) {
defer func() {
if r := recover(); r != nil {
log.Error("control recovering from failure %v", r)
}
}()
// establish control channel
conn, err := conn.Dial(s.opts.server, "ctl", tlsConfig)
if err != nil {
panic(err)
}
defer conn.Close()
// register with the server
err = msg.WriteMsg(conn, &msg.RegMsg{
Protocol: s.opts.protocol,
OS: runtime.GOOS,
HttpAuth: s.opts.httpAuth,
Hostname: s.opts.hostname,
Subdomain: s.opts.subdomain,
ClientId: s.id,
Version: version.Proto,
MmVersion: version.MajorMinor(),
User: s.opts.authtoken,
})
if err != nil {
panic(err)
}
// wait for the server to ack our register
var regAck msg.RegAckMsg
if err = msg.ReadMsgInto(conn, ®Ack); err != nil {
panic(err)
}
if regAck.Error != "" {
emsg := fmt.Sprintf("Server failed to allocate tunnel: %s", regAck.Error)
ctl.Cmds <- ui.CmdQuit{Message: emsg}
return
}
// update UI state
s.publicUrl = regAck.Url
conn.Info("Tunnel established at %v", s.GetPublicUrl())
s.status = "online"
s.serverVersion = regAck.MmVersion
ctl.Update(s)
SaveAuthToken(s.opts.authtoken)
// start the heartbeat
lastPong := time.Now().UnixNano()
go heartbeat(&lastPong, conn)
// main control loop
for {
var m msg.Message
if m, err = msg.ReadMsg(conn); err != nil {
panic(err)
}
switch m.(type) {
case *msg.ReqProxyMsg:
go proxy(regAck.ProxyAddr, s, ctl)
case *msg.PongMsg:
atomic.StoreInt64(&lastPong, time.Now().UnixNano())
}
}
}