github.com/EagleQL/Xray-core@v1.4.3/transport/internet/websocket/hub.go (about)

     1  package websocket
     2  
     3  import (
     4  	"bytes"
     5  	"context"
     6  	"crypto/tls"
     7  	"encoding/base64"
     8  	"io"
     9  	"net/http"
    10  	"strings"
    11  	"sync"
    12  	"time"
    13  
    14  	"github.com/gorilla/websocket"
    15  
    16  	"github.com/xtls/xray-core/common"
    17  	"github.com/xtls/xray-core/common/net"
    18  	http_proto "github.com/xtls/xray-core/common/protocol/http"
    19  	"github.com/xtls/xray-core/common/session"
    20  	"github.com/xtls/xray-core/transport/internet"
    21  	v2tls "github.com/xtls/xray-core/transport/internet/tls"
    22  )
    23  
    24  type requestHandler struct {
    25  	path string
    26  	ln   *Listener
    27  }
    28  
    29  var replacer = strings.NewReplacer("+", "-", "/", "_", "=", "")
    30  
    31  var upgrader = &websocket.Upgrader{
    32  	ReadBufferSize:   4 * 1024,
    33  	WriteBufferSize:  4 * 1024,
    34  	HandshakeTimeout: time.Second * 4,
    35  	CheckOrigin: func(r *http.Request) bool {
    36  		return true
    37  	},
    38  }
    39  
    40  func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
    41  	if request.URL.Path != h.path {
    42  		writer.WriteHeader(http.StatusNotFound)
    43  		return
    44  	}
    45  
    46  	var extraReader io.Reader
    47  	var responseHeader = http.Header{}
    48  	if str := request.Header.Get("Sec-WebSocket-Protocol"); str != "" {
    49  		if ed, err := base64.RawURLEncoding.DecodeString(replacer.Replace(str)); err == nil && len(ed) > 0 {
    50  			extraReader = bytes.NewReader(ed)
    51  			responseHeader.Set("Sec-WebSocket-Protocol", str)
    52  		}
    53  	}
    54  
    55  	conn, err := upgrader.Upgrade(writer, request, responseHeader)
    56  	if err != nil {
    57  		newError("failed to convert to WebSocket connection").Base(err).WriteToLog()
    58  		return
    59  	}
    60  
    61  	forwardedAddrs := http_proto.ParseXForwardedFor(request.Header)
    62  	remoteAddr := conn.RemoteAddr()
    63  	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
    64  		remoteAddr = &net.TCPAddr{
    65  			IP:   forwardedAddrs[0].IP(),
    66  			Port: int(0),
    67  		}
    68  	}
    69  
    70  	h.ln.addConn(newConnection(conn, remoteAddr, extraReader))
    71  }
    72  
    73  type Listener struct {
    74  	sync.Mutex
    75  	server   http.Server
    76  	listener net.Listener
    77  	config   *Config
    78  	addConn  internet.ConnHandler
    79  	locker   *internet.FileLocker // for unix domain socket
    80  }
    81  
    82  func ListenWS(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (internet.Listener, error) {
    83  	l := &Listener{
    84  		addConn: addConn,
    85  	}
    86  	wsSettings := streamSettings.ProtocolSettings.(*Config)
    87  	l.config = wsSettings
    88  	if l.config != nil {
    89  		if streamSettings.SocketSettings == nil {
    90  			streamSettings.SocketSettings = &internet.SocketConfig{}
    91  		}
    92  		streamSettings.SocketSettings.AcceptProxyProtocol =
    93  			l.config.AcceptProxyProtocol || streamSettings.SocketSettings.AcceptProxyProtocol
    94  	}
    95  	var listener net.Listener
    96  	var err error
    97  	if port == net.Port(0) { //unix
    98  		listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
    99  			Name: address.Domain(),
   100  			Net:  "unix",
   101  		}, streamSettings.SocketSettings)
   102  		if err != nil {
   103  			return nil, newError("failed to listen unix domain socket(for WS) on ", address).Base(err)
   104  		}
   105  		newError("listening unix domain socket(for WS) on ", address).WriteToLog(session.ExportIDToError(ctx))
   106  		locker := ctx.Value(address.Domain())
   107  		if locker != nil {
   108  			l.locker = locker.(*internet.FileLocker)
   109  		}
   110  	} else { //tcp
   111  		listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
   112  			IP:   address.IP(),
   113  			Port: int(port),
   114  		}, streamSettings.SocketSettings)
   115  		if err != nil {
   116  			return nil, newError("failed to listen TCP(for WS) on ", address, ":", port).Base(err)
   117  		}
   118  		newError("listening TCP(for WS) on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
   119  	}
   120  
   121  	if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol {
   122  		newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
   123  	}
   124  
   125  	if config := v2tls.ConfigFromStreamSettings(streamSettings); config != nil {
   126  		if tlsConfig := config.GetTLSConfig(); tlsConfig != nil {
   127  			listener = tls.NewListener(listener, tlsConfig)
   128  		}
   129  	}
   130  
   131  	l.listener = listener
   132  
   133  	l.server = http.Server{
   134  		Handler: &requestHandler{
   135  			path: wsSettings.GetNormalizedPath(),
   136  			ln:   l,
   137  		},
   138  		ReadHeaderTimeout: time.Second * 4,
   139  		MaxHeaderBytes:    4096,
   140  	}
   141  
   142  	go func() {
   143  		if err := l.server.Serve(l.listener); err != nil {
   144  			newError("failed to serve http for WebSocket").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
   145  		}
   146  	}()
   147  
   148  	return l, err
   149  }
   150  
   151  // Addr implements net.Listener.Addr().
   152  func (ln *Listener) Addr() net.Addr {
   153  	return ln.listener.Addr()
   154  }
   155  
   156  // Close implements net.Listener.Close().
   157  func (ln *Listener) Close() error {
   158  	if ln.locker != nil {
   159  		ln.locker.Release()
   160  	}
   161  	return ln.listener.Close()
   162  }
   163  
   164  func init() {
   165  	common.Must(internet.RegisterTransportListener(protocolName, ListenWS))
   166  }