Xray-core/transport/internet/websocket/hub.go

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package websocket
import (
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"bytes"
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"context"
"crypto/tls"
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"encoding/base64"
"io"
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"net/http"
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"strings"
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"sync"
"time"
"github.com/gorilla/websocket"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
http_proto "github.com/xtls/xray-core/common/protocol/http"
"github.com/xtls/xray-core/transport/internet"
v2tls "github.com/xtls/xray-core/transport/internet/tls"
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)
type requestHandler struct {
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host string
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path string
ln *Listener
}
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var replacer = strings.NewReplacer("+", "-", "/", "_", "=", "")
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var upgrader = &websocket.Upgrader{
ReadBufferSize: 0,
WriteBufferSize: 0,
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HandshakeTimeout: time.Second * 4,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
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if len(h.host) > 0 && !strings.Contains(strings.ToLower(request.Host), strings.ToLower(h.host)) {
errors.LogInfo(context.Background(), "failed to validate host, request:", request.Host, ", config:", h.host)
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writer.WriteHeader(http.StatusNotFound)
return
}
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if request.URL.Path != h.path {
errors.LogInfo(context.Background(), "failed to validate path, request:", request.URL.Path, ", config:", h.path)
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writer.WriteHeader(http.StatusNotFound)
return
}
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var extraReader io.Reader
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responseHeader := http.Header{}
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if str := request.Header.Get("Sec-WebSocket-Protocol"); str != "" {
if ed, err := base64.RawURLEncoding.DecodeString(replacer.Replace(str)); err == nil && len(ed) > 0 {
extraReader = bytes.NewReader(ed)
responseHeader.Set("Sec-WebSocket-Protocol", str)
}
}
conn, err := upgrader.Upgrade(writer, request, responseHeader)
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if err != nil {
errors.LogInfoInner(context.Background(), err, "failed to convert to WebSocket connection")
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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),
}
}
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h.ln.addConn(newConnection(conn, remoteAddr, extraReader))
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}
type Listener struct {
sync.Mutex
server http.Server
listener net.Listener
config *Config
addConn internet.ConnHandler
}
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{}
}
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streamSettings.SocketSettings.AcceptProxyProtocol = l.config.AcceptProxyProtocol || streamSettings.SocketSettings.AcceptProxyProtocol
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}
var listener net.Listener
var err error
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if port == net.Port(0) { // unix
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listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
Name: address.Domain(),
Net: "unix",
}, streamSettings.SocketSettings)
if err != nil {
return nil, errors.New("failed to listen unix domain socket(for WS) on ", address).Base(err)
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}
errors.LogInfo(ctx, "listening unix domain socket(for WS) on ", address)
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} else { // tcp
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listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
IP: address.IP(),
Port: int(port),
}, streamSettings.SocketSettings)
if err != nil {
return nil, errors.New("failed to listen TCP(for WS) on ", address, ":", port).Base(err)
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}
errors.LogInfo(ctx, "listening TCP(for WS) on ", address, ":", port)
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}
if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol {
errors.LogWarning(ctx, "accepting PROXY protocol")
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}
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{
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host: wsSettings.Host,
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path: wsSettings.GetNormalizedPath(),
ln: l,
},
ReadHeaderTimeout: time.Second * 4,
MaxHeaderBytes: 8192,
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}
go func() {
if err := l.server.Serve(l.listener); err != nil {
errors.LogWarningInner(ctx, err, "failed to serve http for WebSocket")
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}
}()
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 {
return ln.listener.Close()
}
func init() {
common.Must(internet.RegisterTransportListener(protocolName, ListenWS))
}