mirror of
https://github.com/fatedier/frp.git
synced 2024-12-12 09:41:19 +01:00
Merge pull request #886 from fatedier/websocket
Connect protocol support websocket
This commit is contained in:
commit
f14ed87b29
7
Gopkg.lock
generated
7
Gopkg.lock
generated
@ -30,7 +30,7 @@
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"net/mux",
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"pool"
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]
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revision = "416571c55dbc32e13ce82c301a2a4b5a48ad7309"
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revision = "280fa74053dee5311c46094f4bdefbf76d3fcbe2"
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[[projects]]
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branch = "frp"
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@ -167,13 +167,14 @@
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"internal/socket",
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"internal/socks",
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"ipv4",
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"proxy"
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"proxy",
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"websocket"
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]
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revision = "dfa909b99c79129e1100513e5cd36307665e5723"
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[solve-meta]
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analyzer-name = "dep"
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analyzer-version = 1
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inputs-digest = "621310de53a9243693d20ce53690f373fd558440616fcf2893fec5ba4aa2b6ca"
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inputs-digest = "58a51c884de4111bfa3d2f82a7cfe1cb91e9e8786fafdfdc8d306bed24f23e44"
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solver-name = "gps-cdcl"
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solver-version = 1
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|
@ -41,7 +41,7 @@ user = your_name
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login_fail_exit = true
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# communication protocol used to connect to server
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# now it supports tcp and kcp, default is tcp
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# now it supports tcp and kcp and websocket, default is tcp
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protocol = tcp
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# specify a dns server, so frpc will use this instead of default one
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|
@ -186,9 +186,10 @@ func UnmarshalClientConfFromIni(defaultCfg *ClientCommonConf, content string) (c
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}
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if tmpStr, ok = conf.Get("common", "protocol"); ok {
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// Now it only support tcp and kcp.
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if tmpStr != "kcp" {
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tmpStr = "tcp"
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// Now it only support tcp and kcp and websocket.
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if tmpStr != "tcp" && tmpStr != "kcp" && tmpStr != "websocket" {
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err = fmt.Errorf("Parse conf error: invalid protocol")
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return
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}
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cfg.Protocol = tmpStr
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}
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|
@ -15,6 +15,7 @@
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package server
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net"
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@ -53,6 +54,9 @@ type Service struct {
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// Accept connections using kcp
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kcpListener frpNet.Listener
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// Accept connections using websocket
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websocketListener frpNet.Listener
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// For https proxies, route requests to different clients by hostname and other infomation
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VhostHttpsMuxer *vhost.HttpsMuxer
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@ -109,9 +113,6 @@ func NewService() (svr *Service, err error) {
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if cfg.BindPort == cfg.VhostHttpsPort {
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httpsMuxOn = true
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}
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if httpMuxOn || httpsMuxOn {
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svr.muxer = mux.NewMux()
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}
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}
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// Listen for accepting connections from client.
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@ -120,10 +121,11 @@ func NewService() (svr *Service, err error) {
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err = fmt.Errorf("Create server listener error, %v", err)
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return
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}
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if svr.muxer != nil {
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go svr.muxer.Serve(ln)
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ln = svr.muxer.DefaultListener()
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}
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svr.muxer = mux.NewMux(ln)
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go svr.muxer.Serve()
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ln = svr.muxer.DefaultListener()
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svr.listener = frpNet.WrapLogListener(ln)
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log.Info("frps tcp listen on %s:%d", cfg.BindAddr, cfg.BindPort)
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@ -137,6 +139,13 @@ func NewService() (svr *Service, err error) {
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log.Info("frps kcp listen on udp %s:%d", cfg.BindAddr, cfg.KcpBindPort)
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}
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// Listen for accepting connections from client using websocket protocol.
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websocketPrefix := []byte("GET " + frpNet.FrpWebsocketPath)
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websocketLn := svr.muxer.Listen(0, uint32(len(websocketPrefix)), func(data []byte) bool {
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return bytes.Equal(data, websocketPrefix)
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})
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svr.websocketListener = frpNet.NewWebsocketListener(websocketLn)
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// Create http vhost muxer.
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if cfg.VhostHttpPort > 0 {
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rp := vhost.NewHttpReverseProxy(vhost.HttpReverseProxyOptions{
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@ -151,7 +160,7 @@ func NewService() (svr *Service, err error) {
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}
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var l net.Listener
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if httpMuxOn {
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l = svr.muxer.ListenHttp(0)
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l = svr.muxer.ListenHttp(1)
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} else {
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l, err = net.Listen("tcp", address)
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if err != nil {
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@ -167,7 +176,7 @@ func NewService() (svr *Service, err error) {
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if cfg.VhostHttpsPort > 0 {
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var l net.Listener
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if httpsMuxOn {
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l = svr.muxer.ListenHttps(0)
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l = svr.muxer.ListenHttps(1)
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} else {
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l, err = net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.ProxyBindAddr, cfg.VhostHttpsPort))
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if err != nil {
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@ -206,6 +215,7 @@ func NewService() (svr *Service, err error) {
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}
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log.Info("Dashboard listen on %s:%d", cfg.DashboardAddr, cfg.DashboardPort)
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}
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return
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}
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@ -216,8 +226,10 @@ func (svr *Service) Run() {
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if g.GlbServerCfg.KcpBindPort > 0 {
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go svr.HandleListener(svr.kcpListener)
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}
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svr.HandleListener(svr.listener)
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go svr.HandleListener(svr.websocketListener)
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svr.HandleListener(svr.listener)
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}
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func (svr *Service) HandleListener(l frpNet.Listener) {
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|
@ -96,45 +96,34 @@ func (conn *WrapReadWriteCloserConn) SetWriteDeadline(t time.Time) error {
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return &net.OpError{Op: "set", Net: "wrap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
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}
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func ConnectServer(protocol string, addr string) (c Conn, err error) {
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switch protocol {
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case "tcp":
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return ConnectTcpServer(addr)
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case "kcp":
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kcpConn, errRet := kcp.DialWithOptions(addr, nil, 10, 3)
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if errRet != nil {
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err = errRet
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return
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}
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kcpConn.SetStreamMode(true)
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kcpConn.SetWriteDelay(true)
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kcpConn.SetNoDelay(1, 20, 2, 1)
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kcpConn.SetWindowSize(128, 512)
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kcpConn.SetMtu(1350)
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kcpConn.SetACKNoDelay(false)
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kcpConn.SetReadBuffer(4194304)
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kcpConn.SetWriteBuffer(4194304)
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c = WrapConn(kcpConn)
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return
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default:
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return nil, fmt.Errorf("unsupport protocol: %s", protocol)
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type CloseNotifyConn struct {
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net.Conn
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log.Logger
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// 1 means closed
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closeFlag int32
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closeFn func()
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}
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// closeFn will be only called once
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func WrapCloseNotifyConn(c net.Conn, closeFn func()) Conn {
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return &CloseNotifyConn{
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Conn: c,
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Logger: log.NewPrefixLogger(""),
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closeFn: closeFn,
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}
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}
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func ConnectServerByProxy(proxyUrl string, protocol string, addr string) (c Conn, err error) {
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switch protocol {
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case "tcp":
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var conn net.Conn
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if conn, err = gnet.DialTcpByProxy(proxyUrl, addr); err != nil {
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return
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func (cc *CloseNotifyConn) Close() (err error) {
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pflag := atomic.SwapInt32(&cc.closeFlag, 1)
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if pflag == 0 {
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err = cc.Close()
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if cc.closeFn != nil {
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cc.closeFn()
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}
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return WrapConn(conn), nil
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case "kcp":
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// http proxy is not supported for kcp
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return ConnectServer(protocol, addr)
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default:
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return nil, fmt.Errorf("unsupport protocol: %s", protocol)
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}
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return
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}
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type StatsConn struct {
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@ -175,3 +164,46 @@ func (statsConn *StatsConn) Close() (err error) {
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}
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return
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}
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func ConnectServer(protocol string, addr string) (c Conn, err error) {
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switch protocol {
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case "tcp":
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return ConnectTcpServer(addr)
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case "kcp":
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kcpConn, errRet := kcp.DialWithOptions(addr, nil, 10, 3)
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if errRet != nil {
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err = errRet
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return
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}
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kcpConn.SetStreamMode(true)
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kcpConn.SetWriteDelay(true)
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kcpConn.SetNoDelay(1, 20, 2, 1)
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kcpConn.SetWindowSize(128, 512)
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kcpConn.SetMtu(1350)
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kcpConn.SetACKNoDelay(false)
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kcpConn.SetReadBuffer(4194304)
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kcpConn.SetWriteBuffer(4194304)
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c = WrapConn(kcpConn)
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return
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default:
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return nil, fmt.Errorf("unsupport protocol: %s", protocol)
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}
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}
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func ConnectServerByProxy(proxyUrl string, protocol string, addr string) (c Conn, err error) {
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switch protocol {
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case "tcp":
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var conn net.Conn
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if conn, err = gnet.DialTcpByProxy(proxyUrl, addr); err != nil {
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return
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}
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return WrapConn(conn), nil
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case "kcp":
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// http proxy is not supported for kcp
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return ConnectServer(protocol, addr)
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case "websocket":
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return ConnectWebsocketServer(addr)
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default:
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return nil, fmt.Errorf("unsupport protocol: %s", protocol)
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}
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}
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|
105
utils/net/websocket.go
Normal file
105
utils/net/websocket.go
Normal file
@ -0,0 +1,105 @@
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package net
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import (
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"errors"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"time"
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"github.com/fatedier/frp/utils/log"
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"golang.org/x/net/websocket"
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)
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var (
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ErrWebsocketListenerClosed = errors.New("websocket listener closed")
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)
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const (
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FrpWebsocketPath = "/~!frp"
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)
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type WebsocketListener struct {
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net.Addr
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ln net.Listener
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accept chan Conn
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log.Logger
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||||
|
||||
server *http.Server
|
||||
httpMutex *http.ServeMux
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||||
}
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|
||||
// ln: tcp listener for websocket connections
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||||
func NewWebsocketListener(ln net.Listener) (wl *WebsocketListener) {
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wl = &WebsocketListener{
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||||
Addr: ln.Addr(),
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||||
accept: make(chan Conn),
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||||
Logger: log.NewPrefixLogger(""),
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||||
}
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||||
|
||||
muxer := http.NewServeMux()
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||||
muxer.Handle(FrpWebsocketPath, websocket.Handler(func(c *websocket.Conn) {
|
||||
notifyCh := make(chan struct{})
|
||||
conn := WrapCloseNotifyConn(c, func() {
|
||||
close(notifyCh)
|
||||
})
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||||
wl.accept <- conn
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||||
<-notifyCh
|
||||
}))
|
||||
|
||||
wl.server = &http.Server{
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||||
Addr: ln.Addr().String(),
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||||
Handler: muxer,
|
||||
}
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||||
|
||||
go wl.server.Serve(ln)
|
||||
return
|
||||
}
|
||||
|
||||
func ListenWebsocket(bindAddr string, bindPort int) (*WebsocketListener, error) {
|
||||
tcpLn, err := net.Listen("tcp", fmt.Sprintf("%s:%d", bindAddr, bindPort))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
l := NewWebsocketListener(tcpLn)
|
||||
return l, nil
|
||||
}
|
||||
|
||||
func (p *WebsocketListener) Accept() (Conn, error) {
|
||||
c, ok := <-p.accept
|
||||
if !ok {
|
||||
return nil, ErrWebsocketListenerClosed
|
||||
}
|
||||
return c, nil
|
||||
}
|
||||
|
||||
func (p *WebsocketListener) Close() error {
|
||||
return p.server.Close()
|
||||
}
|
||||
|
||||
// addr: domain:port
|
||||
func ConnectWebsocketServer(addr string) (Conn, error) {
|
||||
addr = "ws://" + addr + FrpWebsocketPath
|
||||
uri, err := url.Parse(addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
origin := "http://" + uri.Host
|
||||
cfg, err := websocket.NewConfig(addr, origin)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
cfg.Dialer = &net.Dialer{
|
||||
Timeout: 10 * time.Second,
|
||||
}
|
||||
|
||||
conn, err := websocket.DialConfig(cfg)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
c := WrapConn(conn)
|
||||
return c, nil
|
||||
}
|
10
vendor/github.com/fatedier/golib/net/mux/mux.go
generated
vendored
10
vendor/github.com/fatedier/golib/net/mux/mux.go
generated
vendored
@ -43,8 +43,9 @@ type Mux struct {
|
||||
mu sync.RWMutex
|
||||
}
|
||||
|
||||
func NewMux() (mux *Mux) {
|
||||
func NewMux(ln net.Listener) (mux *Mux) {
|
||||
mux = &Mux{
|
||||
ln: ln,
|
||||
lns: make([]*listener, 0),
|
||||
}
|
||||
return
|
||||
@ -123,15 +124,12 @@ func (mux *Mux) copyLns() []*listener {
|
||||
}
|
||||
|
||||
// Serve handles connections from ln and multiplexes then across registered listeners.
|
||||
func (mux *Mux) Serve(ln net.Listener) error {
|
||||
mux.mu.Lock()
|
||||
mux.ln = ln
|
||||
mux.mu.Unlock()
|
||||
func (mux *Mux) Serve() error {
|
||||
for {
|
||||
// Wait for the next connection.
|
||||
// If it returns a temporary error then simply retry.
|
||||
// If it returns any other error then exit immediately.
|
||||
conn, err := ln.Accept()
|
||||
conn, err := mux.ln.Accept()
|
||||
if err, ok := err.(interface {
|
||||
Temporary() bool
|
||||
}); ok && err.Temporary() {
|
||||
|
106
vendor/golang.org/x/net/websocket/client.go
generated
vendored
Normal file
106
vendor/golang.org/x/net/websocket/client.go
generated
vendored
Normal file
@ -0,0 +1,106 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"io"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/url"
|
||||
)
|
||||
|
||||
// DialError is an error that occurs while dialling a websocket server.
|
||||
type DialError struct {
|
||||
*Config
|
||||
Err error
|
||||
}
|
||||
|
||||
func (e *DialError) Error() string {
|
||||
return "websocket.Dial " + e.Config.Location.String() + ": " + e.Err.Error()
|
||||
}
|
||||
|
||||
// NewConfig creates a new WebSocket config for client connection.
|
||||
func NewConfig(server, origin string) (config *Config, err error) {
|
||||
config = new(Config)
|
||||
config.Version = ProtocolVersionHybi13
|
||||
config.Location, err = url.ParseRequestURI(server)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
config.Origin, err = url.ParseRequestURI(origin)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
config.Header = http.Header(make(map[string][]string))
|
||||
return
|
||||
}
|
||||
|
||||
// NewClient creates a new WebSocket client connection over rwc.
|
||||
func NewClient(config *Config, rwc io.ReadWriteCloser) (ws *Conn, err error) {
|
||||
br := bufio.NewReader(rwc)
|
||||
bw := bufio.NewWriter(rwc)
|
||||
err = hybiClientHandshake(config, br, bw)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
buf := bufio.NewReadWriter(br, bw)
|
||||
ws = newHybiClientConn(config, buf, rwc)
|
||||
return
|
||||
}
|
||||
|
||||
// Dial opens a new client connection to a WebSocket.
|
||||
func Dial(url_, protocol, origin string) (ws *Conn, err error) {
|
||||
config, err := NewConfig(url_, origin)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if protocol != "" {
|
||||
config.Protocol = []string{protocol}
|
||||
}
|
||||
return DialConfig(config)
|
||||
}
|
||||
|
||||
var portMap = map[string]string{
|
||||
"ws": "80",
|
||||
"wss": "443",
|
||||
}
|
||||
|
||||
func parseAuthority(location *url.URL) string {
|
||||
if _, ok := portMap[location.Scheme]; ok {
|
||||
if _, _, err := net.SplitHostPort(location.Host); err != nil {
|
||||
return net.JoinHostPort(location.Host, portMap[location.Scheme])
|
||||
}
|
||||
}
|
||||
return location.Host
|
||||
}
|
||||
|
||||
// DialConfig opens a new client connection to a WebSocket with a config.
|
||||
func DialConfig(config *Config) (ws *Conn, err error) {
|
||||
var client net.Conn
|
||||
if config.Location == nil {
|
||||
return nil, &DialError{config, ErrBadWebSocketLocation}
|
||||
}
|
||||
if config.Origin == nil {
|
||||
return nil, &DialError{config, ErrBadWebSocketOrigin}
|
||||
}
|
||||
dialer := config.Dialer
|
||||
if dialer == nil {
|
||||
dialer = &net.Dialer{}
|
||||
}
|
||||
client, err = dialWithDialer(dialer, config)
|
||||
if err != nil {
|
||||
goto Error
|
||||
}
|
||||
ws, err = NewClient(config, client)
|
||||
if err != nil {
|
||||
client.Close()
|
||||
goto Error
|
||||
}
|
||||
return
|
||||
|
||||
Error:
|
||||
return nil, &DialError{config, err}
|
||||
}
|
24
vendor/golang.org/x/net/websocket/dial.go
generated
vendored
Normal file
24
vendor/golang.org/x/net/websocket/dial.go
generated
vendored
Normal file
@ -0,0 +1,24 @@
|
||||
// Copyright 2015 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"crypto/tls"
|
||||
"net"
|
||||
)
|
||||
|
||||
func dialWithDialer(dialer *net.Dialer, config *Config) (conn net.Conn, err error) {
|
||||
switch config.Location.Scheme {
|
||||
case "ws":
|
||||
conn, err = dialer.Dial("tcp", parseAuthority(config.Location))
|
||||
|
||||
case "wss":
|
||||
conn, err = tls.DialWithDialer(dialer, "tcp", parseAuthority(config.Location), config.TlsConfig)
|
||||
|
||||
default:
|
||||
err = ErrBadScheme
|
||||
}
|
||||
return
|
||||
}
|
583
vendor/golang.org/x/net/websocket/hybi.go
generated
vendored
Normal file
583
vendor/golang.org/x/net/websocket/hybi.go
generated
vendored
Normal file
@ -0,0 +1,583 @@
|
||||
// Copyright 2011 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
// This file implements a protocol of hybi draft.
|
||||
// http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-17
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"bytes"
|
||||
"crypto/rand"
|
||||
"crypto/sha1"
|
||||
"encoding/base64"
|
||||
"encoding/binary"
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"strings"
|
||||
)
|
||||
|
||||
const (
|
||||
websocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
|
||||
|
||||
closeStatusNormal = 1000
|
||||
closeStatusGoingAway = 1001
|
||||
closeStatusProtocolError = 1002
|
||||
closeStatusUnsupportedData = 1003
|
||||
closeStatusFrameTooLarge = 1004
|
||||
closeStatusNoStatusRcvd = 1005
|
||||
closeStatusAbnormalClosure = 1006
|
||||
closeStatusBadMessageData = 1007
|
||||
closeStatusPolicyViolation = 1008
|
||||
closeStatusTooBigData = 1009
|
||||
closeStatusExtensionMismatch = 1010
|
||||
|
||||
maxControlFramePayloadLength = 125
|
||||
)
|
||||
|
||||
var (
|
||||
ErrBadMaskingKey = &ProtocolError{"bad masking key"}
|
||||
ErrBadPongMessage = &ProtocolError{"bad pong message"}
|
||||
ErrBadClosingStatus = &ProtocolError{"bad closing status"}
|
||||
ErrUnsupportedExtensions = &ProtocolError{"unsupported extensions"}
|
||||
ErrNotImplemented = &ProtocolError{"not implemented"}
|
||||
|
||||
handshakeHeader = map[string]bool{
|
||||
"Host": true,
|
||||
"Upgrade": true,
|
||||
"Connection": true,
|
||||
"Sec-Websocket-Key": true,
|
||||
"Sec-Websocket-Origin": true,
|
||||
"Sec-Websocket-Version": true,
|
||||
"Sec-Websocket-Protocol": true,
|
||||
"Sec-Websocket-Accept": true,
|
||||
}
|
||||
)
|
||||
|
||||
// A hybiFrameHeader is a frame header as defined in hybi draft.
|
||||
type hybiFrameHeader struct {
|
||||
Fin bool
|
||||
Rsv [3]bool
|
||||
OpCode byte
|
||||
Length int64
|
||||
MaskingKey []byte
|
||||
|
||||
data *bytes.Buffer
|
||||
}
|
||||
|
||||
// A hybiFrameReader is a reader for hybi frame.
|
||||
type hybiFrameReader struct {
|
||||
reader io.Reader
|
||||
|
||||
header hybiFrameHeader
|
||||
pos int64
|
||||
length int
|
||||
}
|
||||
|
||||
func (frame *hybiFrameReader) Read(msg []byte) (n int, err error) {
|
||||
n, err = frame.reader.Read(msg)
|
||||
if frame.header.MaskingKey != nil {
|
||||
for i := 0; i < n; i++ {
|
||||
msg[i] = msg[i] ^ frame.header.MaskingKey[frame.pos%4]
|
||||
frame.pos++
|
||||
}
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
func (frame *hybiFrameReader) PayloadType() byte { return frame.header.OpCode }
|
||||
|
||||
func (frame *hybiFrameReader) HeaderReader() io.Reader {
|
||||
if frame.header.data == nil {
|
||||
return nil
|
||||
}
|
||||
if frame.header.data.Len() == 0 {
|
||||
return nil
|
||||
}
|
||||
return frame.header.data
|
||||
}
|
||||
|
||||
func (frame *hybiFrameReader) TrailerReader() io.Reader { return nil }
|
||||
|
||||
func (frame *hybiFrameReader) Len() (n int) { return frame.length }
|
||||
|
||||
// A hybiFrameReaderFactory creates new frame reader based on its frame type.
|
||||
type hybiFrameReaderFactory struct {
|
||||
*bufio.Reader
|
||||
}
|
||||
|
||||
// NewFrameReader reads a frame header from the connection, and creates new reader for the frame.
|
||||
// See Section 5.2 Base Framing protocol for detail.
|
||||
// http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-17#section-5.2
|
||||
func (buf hybiFrameReaderFactory) NewFrameReader() (frame frameReader, err error) {
|
||||
hybiFrame := new(hybiFrameReader)
|
||||
frame = hybiFrame
|
||||
var header []byte
|
||||
var b byte
|
||||
// First byte. FIN/RSV1/RSV2/RSV3/OpCode(4bits)
|
||||
b, err = buf.ReadByte()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
header = append(header, b)
|
||||
hybiFrame.header.Fin = ((header[0] >> 7) & 1) != 0
|
||||
for i := 0; i < 3; i++ {
|
||||
j := uint(6 - i)
|
||||
hybiFrame.header.Rsv[i] = ((header[0] >> j) & 1) != 0
|
||||
}
|
||||
hybiFrame.header.OpCode = header[0] & 0x0f
|
||||
|
||||
// Second byte. Mask/Payload len(7bits)
|
||||
b, err = buf.ReadByte()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
header = append(header, b)
|
||||
mask := (b & 0x80) != 0
|
||||
b &= 0x7f
|
||||
lengthFields := 0
|
||||
switch {
|
||||
case b <= 125: // Payload length 7bits.
|
||||
hybiFrame.header.Length = int64(b)
|
||||
case b == 126: // Payload length 7+16bits
|
||||
lengthFields = 2
|
||||
case b == 127: // Payload length 7+64bits
|
||||
lengthFields = 8
|
||||
}
|
||||
for i := 0; i < lengthFields; i++ {
|
||||
b, err = buf.ReadByte()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
if lengthFields == 8 && i == 0 { // MSB must be zero when 7+64 bits
|
||||
b &= 0x7f
|
||||
}
|
||||
header = append(header, b)
|
||||
hybiFrame.header.Length = hybiFrame.header.Length*256 + int64(b)
|
||||
}
|
||||
if mask {
|
||||
// Masking key. 4 bytes.
|
||||
for i := 0; i < 4; i++ {
|
||||
b, err = buf.ReadByte()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
header = append(header, b)
|
||||
hybiFrame.header.MaskingKey = append(hybiFrame.header.MaskingKey, b)
|
||||
}
|
||||
}
|
||||
hybiFrame.reader = io.LimitReader(buf.Reader, hybiFrame.header.Length)
|
||||
hybiFrame.header.data = bytes.NewBuffer(header)
|
||||
hybiFrame.length = len(header) + int(hybiFrame.header.Length)
|
||||
return
|
||||
}
|
||||
|
||||
// A HybiFrameWriter is a writer for hybi frame.
|
||||
type hybiFrameWriter struct {
|
||||
writer *bufio.Writer
|
||||
|
||||
header *hybiFrameHeader
|
||||
}
|
||||
|
||||
func (frame *hybiFrameWriter) Write(msg []byte) (n int, err error) {
|
||||
var header []byte
|
||||
var b byte
|
||||
if frame.header.Fin {
|
||||
b |= 0x80
|
||||
}
|
||||
for i := 0; i < 3; i++ {
|
||||
if frame.header.Rsv[i] {
|
||||
j := uint(6 - i)
|
||||
b |= 1 << j
|
||||
}
|
||||
}
|
||||
b |= frame.header.OpCode
|
||||
header = append(header, b)
|
||||
if frame.header.MaskingKey != nil {
|
||||
b = 0x80
|
||||
} else {
|
||||
b = 0
|
||||
}
|
||||
lengthFields := 0
|
||||
length := len(msg)
|
||||
switch {
|
||||
case length <= 125:
|
||||
b |= byte(length)
|
||||
case length < 65536:
|
||||
b |= 126
|
||||
lengthFields = 2
|
||||
default:
|
||||
b |= 127
|
||||
lengthFields = 8
|
||||
}
|
||||
header = append(header, b)
|
||||
for i := 0; i < lengthFields; i++ {
|
||||
j := uint((lengthFields - i - 1) * 8)
|
||||
b = byte((length >> j) & 0xff)
|
||||
header = append(header, b)
|
||||
}
|
||||
if frame.header.MaskingKey != nil {
|
||||
if len(frame.header.MaskingKey) != 4 {
|
||||
return 0, ErrBadMaskingKey
|
||||
}
|
||||
header = append(header, frame.header.MaskingKey...)
|
||||
frame.writer.Write(header)
|
||||
data := make([]byte, length)
|
||||
for i := range data {
|
||||
data[i] = msg[i] ^ frame.header.MaskingKey[i%4]
|
||||
}
|
||||
frame.writer.Write(data)
|
||||
err = frame.writer.Flush()
|
||||
return length, err
|
||||
}
|
||||
frame.writer.Write(header)
|
||||
frame.writer.Write(msg)
|
||||
err = frame.writer.Flush()
|
||||
return length, err
|
||||
}
|
||||
|
||||
func (frame *hybiFrameWriter) Close() error { return nil }
|
||||
|
||||
type hybiFrameWriterFactory struct {
|
||||
*bufio.Writer
|
||||
needMaskingKey bool
|
||||
}
|
||||
|
||||
func (buf hybiFrameWriterFactory) NewFrameWriter(payloadType byte) (frame frameWriter, err error) {
|
||||
frameHeader := &hybiFrameHeader{Fin: true, OpCode: payloadType}
|
||||
if buf.needMaskingKey {
|
||||
frameHeader.MaskingKey, err = generateMaskingKey()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
return &hybiFrameWriter{writer: buf.Writer, header: frameHeader}, nil
|
||||
}
|
||||
|
||||
type hybiFrameHandler struct {
|
||||
conn *Conn
|
||||
payloadType byte
|
||||
}
|
||||
|
||||
func (handler *hybiFrameHandler) HandleFrame(frame frameReader) (frameReader, error) {
|
||||
if handler.conn.IsServerConn() {
|
||||
// The client MUST mask all frames sent to the server.
|
||||
if frame.(*hybiFrameReader).header.MaskingKey == nil {
|
||||
handler.WriteClose(closeStatusProtocolError)
|
||||
return nil, io.EOF
|
||||
}
|
||||
} else {
|
||||
// The server MUST NOT mask all frames.
|
||||
if frame.(*hybiFrameReader).header.MaskingKey != nil {
|
||||
handler.WriteClose(closeStatusProtocolError)
|
||||
return nil, io.EOF
|
||||
}
|
||||
}
|
||||
if header := frame.HeaderReader(); header != nil {
|
||||
io.Copy(ioutil.Discard, header)
|
||||
}
|
||||
switch frame.PayloadType() {
|
||||
case ContinuationFrame:
|
||||
frame.(*hybiFrameReader).header.OpCode = handler.payloadType
|
||||
case TextFrame, BinaryFrame:
|
||||
handler.payloadType = frame.PayloadType()
|
||||
case CloseFrame:
|
||||
return nil, io.EOF
|
||||
case PingFrame, PongFrame:
|
||||
b := make([]byte, maxControlFramePayloadLength)
|
||||
n, err := io.ReadFull(frame, b)
|
||||
if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
|
||||
return nil, err
|
||||
}
|
||||
io.Copy(ioutil.Discard, frame)
|
||||
if frame.PayloadType() == PingFrame {
|
||||
if _, err := handler.WritePong(b[:n]); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
return nil, nil
|
||||
}
|
||||
return frame, nil
|
||||
}
|
||||
|
||||
func (handler *hybiFrameHandler) WriteClose(status int) (err error) {
|
||||
handler.conn.wio.Lock()
|
||||
defer handler.conn.wio.Unlock()
|
||||
w, err := handler.conn.frameWriterFactory.NewFrameWriter(CloseFrame)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
msg := make([]byte, 2)
|
||||
binary.BigEndian.PutUint16(msg, uint16(status))
|
||||
_, err = w.Write(msg)
|
||||
w.Close()
|
||||
return err
|
||||
}
|
||||
|
||||
func (handler *hybiFrameHandler) WritePong(msg []byte) (n int, err error) {
|
||||
handler.conn.wio.Lock()
|
||||
defer handler.conn.wio.Unlock()
|
||||
w, err := handler.conn.frameWriterFactory.NewFrameWriter(PongFrame)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
n, err = w.Write(msg)
|
||||
w.Close()
|
||||
return n, err
|
||||
}
|
||||
|
||||
// newHybiConn creates a new WebSocket connection speaking hybi draft protocol.
|
||||
func newHybiConn(config *Config, buf *bufio.ReadWriter, rwc io.ReadWriteCloser, request *http.Request) *Conn {
|
||||
if buf == nil {
|
||||
br := bufio.NewReader(rwc)
|
||||
bw := bufio.NewWriter(rwc)
|
||||
buf = bufio.NewReadWriter(br, bw)
|
||||
}
|
||||
ws := &Conn{config: config, request: request, buf: buf, rwc: rwc,
|
||||
frameReaderFactory: hybiFrameReaderFactory{buf.Reader},
|
||||
frameWriterFactory: hybiFrameWriterFactory{
|
||||
buf.Writer, request == nil},
|
||||
PayloadType: TextFrame,
|
||||
defaultCloseStatus: closeStatusNormal}
|
||||
ws.frameHandler = &hybiFrameHandler{conn: ws}
|
||||
return ws
|
||||
}
|
||||
|
||||
// generateMaskingKey generates a masking key for a frame.
|
||||
func generateMaskingKey() (maskingKey []byte, err error) {
|
||||
maskingKey = make([]byte, 4)
|
||||
if _, err = io.ReadFull(rand.Reader, maskingKey); err != nil {
|
||||
return
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// generateNonce generates a nonce consisting of a randomly selected 16-byte
|
||||
// value that has been base64-encoded.
|
||||
func generateNonce() (nonce []byte) {
|
||||
key := make([]byte, 16)
|
||||
if _, err := io.ReadFull(rand.Reader, key); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
nonce = make([]byte, 24)
|
||||
base64.StdEncoding.Encode(nonce, key)
|
||||
return
|
||||
}
|
||||
|
||||
// removeZone removes IPv6 zone identifer from host.
|
||||
// E.g., "[fe80::1%en0]:8080" to "[fe80::1]:8080"
|
||||
func removeZone(host string) string {
|
||||
if !strings.HasPrefix(host, "[") {
|
||||
return host
|
||||
}
|
||||
i := strings.LastIndex(host, "]")
|
||||
if i < 0 {
|
||||
return host
|
||||
}
|
||||
j := strings.LastIndex(host[:i], "%")
|
||||
if j < 0 {
|
||||
return host
|
||||
}
|
||||
return host[:j] + host[i:]
|
||||
}
|
||||
|
||||
// getNonceAccept computes the base64-encoded SHA-1 of the concatenation of
|
||||
// the nonce ("Sec-WebSocket-Key" value) with the websocket GUID string.
|
||||
func getNonceAccept(nonce []byte) (expected []byte, err error) {
|
||||
h := sha1.New()
|
||||
if _, err = h.Write(nonce); err != nil {
|
||||
return
|
||||
}
|
||||
if _, err = h.Write([]byte(websocketGUID)); err != nil {
|
||||
return
|
||||
}
|
||||
expected = make([]byte, 28)
|
||||
base64.StdEncoding.Encode(expected, h.Sum(nil))
|
||||
return
|
||||
}
|
||||
|
||||
// Client handshake described in draft-ietf-hybi-thewebsocket-protocol-17
|
||||
func hybiClientHandshake(config *Config, br *bufio.Reader, bw *bufio.Writer) (err error) {
|
||||
bw.WriteString("GET " + config.Location.RequestURI() + " HTTP/1.1\r\n")
|
||||
|
||||
// According to RFC 6874, an HTTP client, proxy, or other
|
||||
// intermediary must remove any IPv6 zone identifier attached
|
||||
// to an outgoing URI.
|
||||
bw.WriteString("Host: " + removeZone(config.Location.Host) + "\r\n")
|
||||
bw.WriteString("Upgrade: websocket\r\n")
|
||||
bw.WriteString("Connection: Upgrade\r\n")
|
||||
nonce := generateNonce()
|
||||
if config.handshakeData != nil {
|
||||
nonce = []byte(config.handshakeData["key"])
|
||||
}
|
||||
bw.WriteString("Sec-WebSocket-Key: " + string(nonce) + "\r\n")
|
||||
bw.WriteString("Origin: " + strings.ToLower(config.Origin.String()) + "\r\n")
|
||||
|
||||
if config.Version != ProtocolVersionHybi13 {
|
||||
return ErrBadProtocolVersion
|
||||
}
|
||||
|
||||
bw.WriteString("Sec-WebSocket-Version: " + fmt.Sprintf("%d", config.Version) + "\r\n")
|
||||
if len(config.Protocol) > 0 {
|
||||
bw.WriteString("Sec-WebSocket-Protocol: " + strings.Join(config.Protocol, ", ") + "\r\n")
|
||||
}
|
||||
// TODO(ukai): send Sec-WebSocket-Extensions.
|
||||
err = config.Header.WriteSubset(bw, handshakeHeader)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
bw.WriteString("\r\n")
|
||||
if err = bw.Flush(); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
resp, err := http.ReadResponse(br, &http.Request{Method: "GET"})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if resp.StatusCode != 101 {
|
||||
return ErrBadStatus
|
||||
}
|
||||
if strings.ToLower(resp.Header.Get("Upgrade")) != "websocket" ||
|
||||
strings.ToLower(resp.Header.Get("Connection")) != "upgrade" {
|
||||
return ErrBadUpgrade
|
||||
}
|
||||
expectedAccept, err := getNonceAccept(nonce)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if resp.Header.Get("Sec-WebSocket-Accept") != string(expectedAccept) {
|
||||
return ErrChallengeResponse
|
||||
}
|
||||
if resp.Header.Get("Sec-WebSocket-Extensions") != "" {
|
||||
return ErrUnsupportedExtensions
|
||||
}
|
||||
offeredProtocol := resp.Header.Get("Sec-WebSocket-Protocol")
|
||||
if offeredProtocol != "" {
|
||||
protocolMatched := false
|
||||
for i := 0; i < len(config.Protocol); i++ {
|
||||
if config.Protocol[i] == offeredProtocol {
|
||||
protocolMatched = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !protocolMatched {
|
||||
return ErrBadWebSocketProtocol
|
||||
}
|
||||
config.Protocol = []string{offeredProtocol}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// newHybiClientConn creates a client WebSocket connection after handshake.
|
||||
func newHybiClientConn(config *Config, buf *bufio.ReadWriter, rwc io.ReadWriteCloser) *Conn {
|
||||
return newHybiConn(config, buf, rwc, nil)
|
||||
}
|
||||
|
||||
// A HybiServerHandshaker performs a server handshake using hybi draft protocol.
|
||||
type hybiServerHandshaker struct {
|
||||
*Config
|
||||
accept []byte
|
||||
}
|
||||
|
||||
func (c *hybiServerHandshaker) ReadHandshake(buf *bufio.Reader, req *http.Request) (code int, err error) {
|
||||
c.Version = ProtocolVersionHybi13
|
||||
if req.Method != "GET" {
|
||||
return http.StatusMethodNotAllowed, ErrBadRequestMethod
|
||||
}
|
||||
// HTTP version can be safely ignored.
|
||||
|
||||
if strings.ToLower(req.Header.Get("Upgrade")) != "websocket" ||
|
||||
!strings.Contains(strings.ToLower(req.Header.Get("Connection")), "upgrade") {
|
||||
return http.StatusBadRequest, ErrNotWebSocket
|
||||
}
|
||||
|
||||
key := req.Header.Get("Sec-Websocket-Key")
|
||||
if key == "" {
|
||||
return http.StatusBadRequest, ErrChallengeResponse
|
||||
}
|
||||
version := req.Header.Get("Sec-Websocket-Version")
|
||||
switch version {
|
||||
case "13":
|
||||
c.Version = ProtocolVersionHybi13
|
||||
default:
|
||||
return http.StatusBadRequest, ErrBadWebSocketVersion
|
||||
}
|
||||
var scheme string
|
||||
if req.TLS != nil {
|
||||
scheme = "wss"
|
||||
} else {
|
||||
scheme = "ws"
|
||||
}
|
||||
c.Location, err = url.ParseRequestURI(scheme + "://" + req.Host + req.URL.RequestURI())
|
||||
if err != nil {
|
||||
return http.StatusBadRequest, err
|
||||
}
|
||||
protocol := strings.TrimSpace(req.Header.Get("Sec-Websocket-Protocol"))
|
||||
if protocol != "" {
|
||||
protocols := strings.Split(protocol, ",")
|
||||
for i := 0; i < len(protocols); i++ {
|
||||
c.Protocol = append(c.Protocol, strings.TrimSpace(protocols[i]))
|
||||
}
|
||||
}
|
||||
c.accept, err = getNonceAccept([]byte(key))
|
||||
if err != nil {
|
||||
return http.StatusInternalServerError, err
|
||||
}
|
||||
return http.StatusSwitchingProtocols, nil
|
||||
}
|
||||
|
||||
// Origin parses the Origin header in req.
|
||||
// If the Origin header is not set, it returns nil and nil.
|
||||
func Origin(config *Config, req *http.Request) (*url.URL, error) {
|
||||
var origin string
|
||||
switch config.Version {
|
||||
case ProtocolVersionHybi13:
|
||||
origin = req.Header.Get("Origin")
|
||||
}
|
||||
if origin == "" {
|
||||
return nil, nil
|
||||
}
|
||||
return url.ParseRequestURI(origin)
|
||||
}
|
||||
|
||||
func (c *hybiServerHandshaker) AcceptHandshake(buf *bufio.Writer) (err error) {
|
||||
if len(c.Protocol) > 0 {
|
||||
if len(c.Protocol) != 1 {
|
||||
// You need choose a Protocol in Handshake func in Server.
|
||||
return ErrBadWebSocketProtocol
|
||||
}
|
||||
}
|
||||
buf.WriteString("HTTP/1.1 101 Switching Protocols\r\n")
|
||||
buf.WriteString("Upgrade: websocket\r\n")
|
||||
buf.WriteString("Connection: Upgrade\r\n")
|
||||
buf.WriteString("Sec-WebSocket-Accept: " + string(c.accept) + "\r\n")
|
||||
if len(c.Protocol) > 0 {
|
||||
buf.WriteString("Sec-WebSocket-Protocol: " + c.Protocol[0] + "\r\n")
|
||||
}
|
||||
// TODO(ukai): send Sec-WebSocket-Extensions.
|
||||
if c.Header != nil {
|
||||
err := c.Header.WriteSubset(buf, handshakeHeader)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
buf.WriteString("\r\n")
|
||||
return buf.Flush()
|
||||
}
|
||||
|
||||
func (c *hybiServerHandshaker) NewServerConn(buf *bufio.ReadWriter, rwc io.ReadWriteCloser, request *http.Request) *Conn {
|
||||
return newHybiServerConn(c.Config, buf, rwc, request)
|
||||
}
|
||||
|
||||
// newHybiServerConn returns a new WebSocket connection speaking hybi draft protocol.
|
||||
func newHybiServerConn(config *Config, buf *bufio.ReadWriter, rwc io.ReadWriteCloser, request *http.Request) *Conn {
|
||||
return newHybiConn(config, buf, rwc, request)
|
||||
}
|
113
vendor/golang.org/x/net/websocket/server.go
generated
vendored
Normal file
113
vendor/golang.org/x/net/websocket/server.go
generated
vendored
Normal file
@ -0,0 +1,113 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"fmt"
|
||||
"io"
|
||||
"net/http"
|
||||
)
|
||||
|
||||
func newServerConn(rwc io.ReadWriteCloser, buf *bufio.ReadWriter, req *http.Request, config *Config, handshake func(*Config, *http.Request) error) (conn *Conn, err error) {
|
||||
var hs serverHandshaker = &hybiServerHandshaker{Config: config}
|
||||
code, err := hs.ReadHandshake(buf.Reader, req)
|
||||
if err == ErrBadWebSocketVersion {
|
||||
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
|
||||
fmt.Fprintf(buf, "Sec-WebSocket-Version: %s\r\n", SupportedProtocolVersion)
|
||||
buf.WriteString("\r\n")
|
||||
buf.WriteString(err.Error())
|
||||
buf.Flush()
|
||||
return
|
||||
}
|
||||
if err != nil {
|
||||
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
|
||||
buf.WriteString("\r\n")
|
||||
buf.WriteString(err.Error())
|
||||
buf.Flush()
|
||||
return
|
||||
}
|
||||
if handshake != nil {
|
||||
err = handshake(config, req)
|
||||
if err != nil {
|
||||
code = http.StatusForbidden
|
||||
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
|
||||
buf.WriteString("\r\n")
|
||||
buf.Flush()
|
||||
return
|
||||
}
|
||||
}
|
||||
err = hs.AcceptHandshake(buf.Writer)
|
||||
if err != nil {
|
||||
code = http.StatusBadRequest
|
||||
fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
|
||||
buf.WriteString("\r\n")
|
||||
buf.Flush()
|
||||
return
|
||||
}
|
||||
conn = hs.NewServerConn(buf, rwc, req)
|
||||
return
|
||||
}
|
||||
|
||||
// Server represents a server of a WebSocket.
|
||||
type Server struct {
|
||||
// Config is a WebSocket configuration for new WebSocket connection.
|
||||
Config
|
||||
|
||||
// Handshake is an optional function in WebSocket handshake.
|
||||
// For example, you can check, or don't check Origin header.
|
||||
// Another example, you can select config.Protocol.
|
||||
Handshake func(*Config, *http.Request) error
|
||||
|
||||
// Handler handles a WebSocket connection.
|
||||
Handler
|
||||
}
|
||||
|
||||
// ServeHTTP implements the http.Handler interface for a WebSocket
|
||||
func (s Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
||||
s.serveWebSocket(w, req)
|
||||
}
|
||||
|
||||
func (s Server) serveWebSocket(w http.ResponseWriter, req *http.Request) {
|
||||
rwc, buf, err := w.(http.Hijacker).Hijack()
|
||||
if err != nil {
|
||||
panic("Hijack failed: " + err.Error())
|
||||
}
|
||||
// The server should abort the WebSocket connection if it finds
|
||||
// the client did not send a handshake that matches with protocol
|
||||
// specification.
|
||||
defer rwc.Close()
|
||||
conn, err := newServerConn(rwc, buf, req, &s.Config, s.Handshake)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
if conn == nil {
|
||||
panic("unexpected nil conn")
|
||||
}
|
||||
s.Handler(conn)
|
||||
}
|
||||
|
||||
// Handler is a simple interface to a WebSocket browser client.
|
||||
// It checks if Origin header is valid URL by default.
|
||||
// You might want to verify websocket.Conn.Config().Origin in the func.
|
||||
// If you use Server instead of Handler, you could call websocket.Origin and
|
||||
// check the origin in your Handshake func. So, if you want to accept
|
||||
// non-browser clients, which do not send an Origin header, set a
|
||||
// Server.Handshake that does not check the origin.
|
||||
type Handler func(*Conn)
|
||||
|
||||
func checkOrigin(config *Config, req *http.Request) (err error) {
|
||||
config.Origin, err = Origin(config, req)
|
||||
if err == nil && config.Origin == nil {
|
||||
return fmt.Errorf("null origin")
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
// ServeHTTP implements the http.Handler interface for a WebSocket
|
||||
func (h Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
||||
s := Server{Handler: h, Handshake: checkOrigin}
|
||||
s.serveWebSocket(w, req)
|
||||
}
|
448
vendor/golang.org/x/net/websocket/websocket.go
generated
vendored
Normal file
448
vendor/golang.org/x/net/websocket/websocket.go
generated
vendored
Normal file
@ -0,0 +1,448 @@
|
||||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package websocket implements a client and server for the WebSocket protocol
|
||||
// as specified in RFC 6455.
|
||||
//
|
||||
// This package currently lacks some features found in an alternative
|
||||
// and more actively maintained WebSocket package:
|
||||
//
|
||||
// https://godoc.org/github.com/gorilla/websocket
|
||||
//
|
||||
package websocket // import "golang.org/x/net/websocket"
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"crypto/tls"
|
||||
"encoding/json"
|
||||
"errors"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
const (
|
||||
ProtocolVersionHybi13 = 13
|
||||
ProtocolVersionHybi = ProtocolVersionHybi13
|
||||
SupportedProtocolVersion = "13"
|
||||
|
||||
ContinuationFrame = 0
|
||||
TextFrame = 1
|
||||
BinaryFrame = 2
|
||||
CloseFrame = 8
|
||||
PingFrame = 9
|
||||
PongFrame = 10
|
||||
UnknownFrame = 255
|
||||
|
||||
DefaultMaxPayloadBytes = 32 << 20 // 32MB
|
||||
)
|
||||
|
||||
// ProtocolError represents WebSocket protocol errors.
|
||||
type ProtocolError struct {
|
||||
ErrorString string
|
||||
}
|
||||
|
||||
func (err *ProtocolError) Error() string { return err.ErrorString }
|
||||
|
||||
var (
|
||||
ErrBadProtocolVersion = &ProtocolError{"bad protocol version"}
|
||||
ErrBadScheme = &ProtocolError{"bad scheme"}
|
||||
ErrBadStatus = &ProtocolError{"bad status"}
|
||||
ErrBadUpgrade = &ProtocolError{"missing or bad upgrade"}
|
||||
ErrBadWebSocketOrigin = &ProtocolError{"missing or bad WebSocket-Origin"}
|
||||
ErrBadWebSocketLocation = &ProtocolError{"missing or bad WebSocket-Location"}
|
||||
ErrBadWebSocketProtocol = &ProtocolError{"missing or bad WebSocket-Protocol"}
|
||||
ErrBadWebSocketVersion = &ProtocolError{"missing or bad WebSocket Version"}
|
||||
ErrChallengeResponse = &ProtocolError{"mismatch challenge/response"}
|
||||
ErrBadFrame = &ProtocolError{"bad frame"}
|
||||
ErrBadFrameBoundary = &ProtocolError{"not on frame boundary"}
|
||||
ErrNotWebSocket = &ProtocolError{"not websocket protocol"}
|
||||
ErrBadRequestMethod = &ProtocolError{"bad method"}
|
||||
ErrNotSupported = &ProtocolError{"not supported"}
|
||||
)
|
||||
|
||||
// ErrFrameTooLarge is returned by Codec's Receive method if payload size
|
||||
// exceeds limit set by Conn.MaxPayloadBytes
|
||||
var ErrFrameTooLarge = errors.New("websocket: frame payload size exceeds limit")
|
||||
|
||||
// Addr is an implementation of net.Addr for WebSocket.
|
||||
type Addr struct {
|
||||
*url.URL
|
||||
}
|
||||
|
||||
// Network returns the network type for a WebSocket, "websocket".
|
||||
func (addr *Addr) Network() string { return "websocket" }
|
||||
|
||||
// Config is a WebSocket configuration
|
||||
type Config struct {
|
||||
// A WebSocket server address.
|
||||
Location *url.URL
|
||||
|
||||
// A Websocket client origin.
|
||||
Origin *url.URL
|
||||
|
||||
// WebSocket subprotocols.
|
||||
Protocol []string
|
||||
|
||||
// WebSocket protocol version.
|
||||
Version int
|
||||
|
||||
// TLS config for secure WebSocket (wss).
|
||||
TlsConfig *tls.Config
|
||||
|
||||
// Additional header fields to be sent in WebSocket opening handshake.
|
||||
Header http.Header
|
||||
|
||||
// Dialer used when opening websocket connections.
|
||||
Dialer *net.Dialer
|
||||
|
||||
handshakeData map[string]string
|
||||
}
|
||||
|
||||
// serverHandshaker is an interface to handle WebSocket server side handshake.
|
||||
type serverHandshaker interface {
|
||||
// ReadHandshake reads handshake request message from client.
|
||||
// Returns http response code and error if any.
|
||||
ReadHandshake(buf *bufio.Reader, req *http.Request) (code int, err error)
|
||||
|
||||
// AcceptHandshake accepts the client handshake request and sends
|
||||
// handshake response back to client.
|
||||
AcceptHandshake(buf *bufio.Writer) (err error)
|
||||
|
||||
// NewServerConn creates a new WebSocket connection.
|
||||
NewServerConn(buf *bufio.ReadWriter, rwc io.ReadWriteCloser, request *http.Request) (conn *Conn)
|
||||
}
|
||||
|
||||
// frameReader is an interface to read a WebSocket frame.
|
||||
type frameReader interface {
|
||||
// Reader is to read payload of the frame.
|
||||
io.Reader
|
||||
|
||||
// PayloadType returns payload type.
|
||||
PayloadType() byte
|
||||
|
||||
// HeaderReader returns a reader to read header of the frame.
|
||||
HeaderReader() io.Reader
|
||||
|
||||
// TrailerReader returns a reader to read trailer of the frame.
|
||||
// If it returns nil, there is no trailer in the frame.
|
||||
TrailerReader() io.Reader
|
||||
|
||||
// Len returns total length of the frame, including header and trailer.
|
||||
Len() int
|
||||
}
|
||||
|
||||
// frameReaderFactory is an interface to creates new frame reader.
|
||||
type frameReaderFactory interface {
|
||||
NewFrameReader() (r frameReader, err error)
|
||||
}
|
||||
|
||||
// frameWriter is an interface to write a WebSocket frame.
|
||||
type frameWriter interface {
|
||||
// Writer is to write payload of the frame.
|
||||
io.WriteCloser
|
||||
}
|
||||
|
||||
// frameWriterFactory is an interface to create new frame writer.
|
||||
type frameWriterFactory interface {
|
||||
NewFrameWriter(payloadType byte) (w frameWriter, err error)
|
||||
}
|
||||
|
||||
type frameHandler interface {
|
||||
HandleFrame(frame frameReader) (r frameReader, err error)
|
||||
WriteClose(status int) (err error)
|
||||
}
|
||||
|
||||
// Conn represents a WebSocket connection.
|
||||
//
|
||||
// Multiple goroutines may invoke methods on a Conn simultaneously.
|
||||
type Conn struct {
|
||||
config *Config
|
||||
request *http.Request
|
||||
|
||||
buf *bufio.ReadWriter
|
||||
rwc io.ReadWriteCloser
|
||||
|
||||
rio sync.Mutex
|
||||
frameReaderFactory
|
||||
frameReader
|
||||
|
||||
wio sync.Mutex
|
||||
frameWriterFactory
|
||||
|
||||
frameHandler
|
||||
PayloadType byte
|
||||
defaultCloseStatus int
|
||||
|
||||
// MaxPayloadBytes limits the size of frame payload received over Conn
|
||||
// by Codec's Receive method. If zero, DefaultMaxPayloadBytes is used.
|
||||
MaxPayloadBytes int
|
||||
}
|
||||
|
||||
// Read implements the io.Reader interface:
|
||||
// it reads data of a frame from the WebSocket connection.
|
||||
// if msg is not large enough for the frame data, it fills the msg and next Read
|
||||
// will read the rest of the frame data.
|
||||
// it reads Text frame or Binary frame.
|
||||
func (ws *Conn) Read(msg []byte) (n int, err error) {
|
||||
ws.rio.Lock()
|
||||
defer ws.rio.Unlock()
|
||||
again:
|
||||
if ws.frameReader == nil {
|
||||
frame, err := ws.frameReaderFactory.NewFrameReader()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
ws.frameReader, err = ws.frameHandler.HandleFrame(frame)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
if ws.frameReader == nil {
|
||||
goto again
|
||||
}
|
||||
}
|
||||
n, err = ws.frameReader.Read(msg)
|
||||
if err == io.EOF {
|
||||
if trailer := ws.frameReader.TrailerReader(); trailer != nil {
|
||||
io.Copy(ioutil.Discard, trailer)
|
||||
}
|
||||
ws.frameReader = nil
|
||||
goto again
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// Write implements the io.Writer interface:
|
||||
// it writes data as a frame to the WebSocket connection.
|
||||
func (ws *Conn) Write(msg []byte) (n int, err error) {
|
||||
ws.wio.Lock()
|
||||
defer ws.wio.Unlock()
|
||||
w, err := ws.frameWriterFactory.NewFrameWriter(ws.PayloadType)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
n, err = w.Write(msg)
|
||||
w.Close()
|
||||
return n, err
|
||||
}
|
||||
|
||||
// Close implements the io.Closer interface.
|
||||
func (ws *Conn) Close() error {
|
||||
err := ws.frameHandler.WriteClose(ws.defaultCloseStatus)
|
||||
err1 := ws.rwc.Close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return err1
|
||||
}
|
||||
|
||||
func (ws *Conn) IsClientConn() bool { return ws.request == nil }
|
||||
func (ws *Conn) IsServerConn() bool { return ws.request != nil }
|
||||
|
||||
// LocalAddr returns the WebSocket Origin for the connection for client, or
|
||||
// the WebSocket location for server.
|
||||
func (ws *Conn) LocalAddr() net.Addr {
|
||||
if ws.IsClientConn() {
|
||||
return &Addr{ws.config.Origin}
|
||||
}
|
||||
return &Addr{ws.config.Location}
|
||||
}
|
||||
|
||||
// RemoteAddr returns the WebSocket location for the connection for client, or
|
||||
// the Websocket Origin for server.
|
||||
func (ws *Conn) RemoteAddr() net.Addr {
|
||||
if ws.IsClientConn() {
|
||||
return &Addr{ws.config.Location}
|
||||
}
|
||||
return &Addr{ws.config.Origin}
|
||||
}
|
||||
|
||||
var errSetDeadline = errors.New("websocket: cannot set deadline: not using a net.Conn")
|
||||
|
||||
// SetDeadline sets the connection's network read & write deadlines.
|
||||
func (ws *Conn) SetDeadline(t time.Time) error {
|
||||
if conn, ok := ws.rwc.(net.Conn); ok {
|
||||
return conn.SetDeadline(t)
|
||||
}
|
||||
return errSetDeadline
|
||||
}
|
||||
|
||||
// SetReadDeadline sets the connection's network read deadline.
|
||||
func (ws *Conn) SetReadDeadline(t time.Time) error {
|
||||
if conn, ok := ws.rwc.(net.Conn); ok {
|
||||
return conn.SetReadDeadline(t)
|
||||
}
|
||||
return errSetDeadline
|
||||
}
|
||||
|
||||
// SetWriteDeadline sets the connection's network write deadline.
|
||||
func (ws *Conn) SetWriteDeadline(t time.Time) error {
|
||||
if conn, ok := ws.rwc.(net.Conn); ok {
|
||||
return conn.SetWriteDeadline(t)
|
||||
}
|
||||
return errSetDeadline
|
||||
}
|
||||
|
||||
// Config returns the WebSocket config.
|
||||
func (ws *Conn) Config() *Config { return ws.config }
|
||||
|
||||
// Request returns the http request upgraded to the WebSocket.
|
||||
// It is nil for client side.
|
||||
func (ws *Conn) Request() *http.Request { return ws.request }
|
||||
|
||||
// Codec represents a symmetric pair of functions that implement a codec.
|
||||
type Codec struct {
|
||||
Marshal func(v interface{}) (data []byte, payloadType byte, err error)
|
||||
Unmarshal func(data []byte, payloadType byte, v interface{}) (err error)
|
||||
}
|
||||
|
||||
// Send sends v marshaled by cd.Marshal as single frame to ws.
|
||||
func (cd Codec) Send(ws *Conn, v interface{}) (err error) {
|
||||
data, payloadType, err := cd.Marshal(v)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
ws.wio.Lock()
|
||||
defer ws.wio.Unlock()
|
||||
w, err := ws.frameWriterFactory.NewFrameWriter(payloadType)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
_, err = w.Write(data)
|
||||
w.Close()
|
||||
return err
|
||||
}
|
||||
|
||||
// Receive receives single frame from ws, unmarshaled by cd.Unmarshal and stores
|
||||
// in v. The whole frame payload is read to an in-memory buffer; max size of
|
||||
// payload is defined by ws.MaxPayloadBytes. If frame payload size exceeds
|
||||
// limit, ErrFrameTooLarge is returned; in this case frame is not read off wire
|
||||
// completely. The next call to Receive would read and discard leftover data of
|
||||
// previous oversized frame before processing next frame.
|
||||
func (cd Codec) Receive(ws *Conn, v interface{}) (err error) {
|
||||
ws.rio.Lock()
|
||||
defer ws.rio.Unlock()
|
||||
if ws.frameReader != nil {
|
||||
_, err = io.Copy(ioutil.Discard, ws.frameReader)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
ws.frameReader = nil
|
||||
}
|
||||
again:
|
||||
frame, err := ws.frameReaderFactory.NewFrameReader()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
frame, err = ws.frameHandler.HandleFrame(frame)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if frame == nil {
|
||||
goto again
|
||||
}
|
||||
maxPayloadBytes := ws.MaxPayloadBytes
|
||||
if maxPayloadBytes == 0 {
|
||||
maxPayloadBytes = DefaultMaxPayloadBytes
|
||||
}
|
||||
if hf, ok := frame.(*hybiFrameReader); ok && hf.header.Length > int64(maxPayloadBytes) {
|
||||
// payload size exceeds limit, no need to call Unmarshal
|
||||
//
|
||||
// set frameReader to current oversized frame so that
|
||||
// the next call to this function can drain leftover
|
||||
// data before processing the next frame
|
||||
ws.frameReader = frame
|
||||
return ErrFrameTooLarge
|
||||
}
|
||||
payloadType := frame.PayloadType()
|
||||
data, err := ioutil.ReadAll(frame)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return cd.Unmarshal(data, payloadType, v)
|
||||
}
|
||||
|
||||
func marshal(v interface{}) (msg []byte, payloadType byte, err error) {
|
||||
switch data := v.(type) {
|
||||
case string:
|
||||
return []byte(data), TextFrame, nil
|
||||
case []byte:
|
||||
return data, BinaryFrame, nil
|
||||
}
|
||||
return nil, UnknownFrame, ErrNotSupported
|
||||
}
|
||||
|
||||
func unmarshal(msg []byte, payloadType byte, v interface{}) (err error) {
|
||||
switch data := v.(type) {
|
||||
case *string:
|
||||
*data = string(msg)
|
||||
return nil
|
||||
case *[]byte:
|
||||
*data = msg
|
||||
return nil
|
||||
}
|
||||
return ErrNotSupported
|
||||
}
|
||||
|
||||
/*
|
||||
Message is a codec to send/receive text/binary data in a frame on WebSocket connection.
|
||||
To send/receive text frame, use string type.
|
||||
To send/receive binary frame, use []byte type.
|
||||
|
||||
Trivial usage:
|
||||
|
||||
import "websocket"
|
||||
|
||||
// receive text frame
|
||||
var message string
|
||||
websocket.Message.Receive(ws, &message)
|
||||
|
||||
// send text frame
|
||||
message = "hello"
|
||||
websocket.Message.Send(ws, message)
|
||||
|
||||
// receive binary frame
|
||||
var data []byte
|
||||
websocket.Message.Receive(ws, &data)
|
||||
|
||||
// send binary frame
|
||||
data = []byte{0, 1, 2}
|
||||
websocket.Message.Send(ws, data)
|
||||
|
||||
*/
|
||||
var Message = Codec{marshal, unmarshal}
|
||||
|
||||
func jsonMarshal(v interface{}) (msg []byte, payloadType byte, err error) {
|
||||
msg, err = json.Marshal(v)
|
||||
return msg, TextFrame, err
|
||||
}
|
||||
|
||||
func jsonUnmarshal(msg []byte, payloadType byte, v interface{}) (err error) {
|
||||
return json.Unmarshal(msg, v)
|
||||
}
|
||||
|
||||
/*
|
||||
JSON is a codec to send/receive JSON data in a frame from a WebSocket connection.
|
||||
|
||||
Trivial usage:
|
||||
|
||||
import "websocket"
|
||||
|
||||
type T struct {
|
||||
Msg string
|
||||
Count int
|
||||
}
|
||||
|
||||
// receive JSON type T
|
||||
var data T
|
||||
websocket.JSON.Receive(ws, &data)
|
||||
|
||||
// send JSON type T
|
||||
websocket.JSON.Send(ws, data)
|
||||
*/
|
||||
var JSON = Codec{jsonMarshal, jsonUnmarshal}
|
Loading…
Reference in New Issue
Block a user