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// +build !confonly
package websocket
import (
"context"
"crypto/tls"
"net/http"
"sync"
"time"
"v2ray.com/core/common"
"v2ray.com/core/common/net"
http_proto "v2ray.com/core/common/protocol/http"
"v2ray.com/core/common/session"
"v2ray.com/core/external/github.com/gorilla/websocket"
"v2ray.com/core/transport/internet"
v2tls "v2ray.com/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,
}
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()
}
h.ln.addConn(newConnection(conn, remoteAddr))
}
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) {
wsSettings := streamSettings.ProtocolSettings.(*Config)
var tlsConfig *tls.Config
if config := v2tls.ConfigFromStreamSettings(streamSettings); config != nil {
tlsConfig = config.GetTLSConfig()
}
listener, err := listenTCP(ctx, address, port, tlsConfig, streamSettings.SocketSettings)
if err != nil {
return nil, err
}
l := &Listener{
config: wsSettings,
addConn: addConn,
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
}
func listenTCP(ctx context.Context, address net.Address, port net.Port, tlsConfig *tls.Config, sockopt *internet.SocketConfig) (net.Listener, error) {
listener, err := internet.ListenSystem(ctx, &net.TCPAddr{
IP: address.IP(),
Port: int(port),
}, sockopt)
if err != nil {
return nil, newError("failed to listen TCP on", address, ":", port).Base(err)
}
if tlsConfig != nil {
return tls.NewListener(listener, tlsConfig), nil
}
return listener, nil
}
// 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))
}
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