Xray-core/transport/internet/websocket/hub.go
2021-03-14 07:10:10 +00:00

159 lines
4.2 KiB
Go

package websocket
import (
"bytes"
"context"
"crypto/tls"
"encoding/base64"
"io"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
http_proto "github.com/xtls/xray-core/common/protocol/http"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/transport/internet"
v2tls "github.com/xtls/xray-core/transport/internet/tls"
)
type requestHandler struct {
path string
ln *Listener
}
var upgrader = &websocket.Upgrader{
ReadBufferSize: 4 * 1024,
WriteBufferSize: 4 * 1024,
HandshakeTimeout: time.Second * 4,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
if request.URL.Path != h.path {
writer.WriteHeader(http.StatusNotFound)
return
}
conn, err := upgrader.Upgrade(writer, request, nil)
if err != nil {
newError("failed to convert to WebSocket connection").Base(err).WriteToLog()
return
}
forwardedAddrs := http_proto.ParseXForwardedFor(request.Header)
remoteAddr := conn.RemoteAddr()
if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
remoteAddr = &net.TCPAddr{
IP: forwardedAddrs[0].IP(),
Port: int(0),
}
}
var extraReader io.Reader
if str := request.Header.Get("Sec-WebSocket-Protocol"); str != "" {
if ed, err := base64.StdEncoding.DecodeString(str); err == nil && len(ed) > 0 {
extraReader = bytes.NewReader(ed)
}
}
h.ln.addConn(newConnection(conn, remoteAddr, extraReader))
}
type Listener struct {
sync.Mutex
server http.Server
listener net.Listener
config *Config
addConn internet.ConnHandler
locker *internet.FileLocker // for unix domain socket
}
func ListenWS(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (internet.Listener, error) {
l := &Listener{
addConn: addConn,
}
wsSettings := streamSettings.ProtocolSettings.(*Config)
l.config = wsSettings
if l.config != nil {
if streamSettings.SocketSettings == nil {
streamSettings.SocketSettings = &internet.SocketConfig{}
}
streamSettings.SocketSettings.AcceptProxyProtocol = l.config.AcceptProxyProtocol
}
var listener net.Listener
var err error
if port == net.Port(0) { //unix
listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
Name: address.Domain(),
Net: "unix",
}, streamSettings.SocketSettings)
if err != nil {
return nil, newError("failed to listen unix domain socket(for WS) on ", address).Base(err)
}
newError("listening unix domain socket(for WS) on ", address).WriteToLog(session.ExportIDToError(ctx))
locker := ctx.Value(address.Domain())
if locker != nil {
l.locker = locker.(*internet.FileLocker)
}
} else { //tcp
listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
IP: address.IP(),
Port: int(port),
}, streamSettings.SocketSettings)
if err != nil {
return nil, newError("failed to listen TCP(for WS) on ", address, ":", port).Base(err)
}
newError("listening TCP(for WS) on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
}
if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol {
newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
if config := v2tls.ConfigFromStreamSettings(streamSettings); config != nil {
if tlsConfig := config.GetTLSConfig(); tlsConfig != nil {
listener = tls.NewListener(listener, tlsConfig)
}
}
l.listener = listener
l.server = http.Server{
Handler: &requestHandler{
path: wsSettings.GetNormalizedPath(),
ln: l,
},
ReadHeaderTimeout: time.Second * 4,
MaxHeaderBytes: 2048,
}
go func() {
if err := l.server.Serve(l.listener); err != nil {
newError("failed to serve http for WebSocket").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
}()
return l, err
}
// Addr implements net.Listener.Addr().
func (ln *Listener) Addr() net.Addr {
return ln.listener.Addr()
}
// Close implements net.Listener.Close().
func (ln *Listener) Close() error {
if ln.locker != nil {
ln.locker.Release()
}
return ln.listener.Close()
}
func init() {
common.Must(internet.RegisterTransportListener(protocolName, ListenWS))
}