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proxy.go
116 lines (103 loc) · 2.34 KB
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proxy.go
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package client
import (
"bytes"
"context"
"fmt"
"log"
"net"
"net/http"
"time"
"github.com/gorilla/websocket"
)
var DefaultUpgrader = &websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
type WebsocketUDPProxy struct {
Upgrader *websocket.Upgrader
addr net.Addr
}
func NewProxy(addr string) (*WebsocketUDPProxy, error) {
raddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
return &WebsocketUDPProxy{addr: raddr}, nil
}
func (w *WebsocketUDPProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
ctx, cancel := context.WithCancel(req.Context())
defer cancel()
upgrader := w.Upgrader
if w.Upgrader == nil {
upgrader = DefaultUpgrader
}
upgradeHeader := http.Header{}
if hdr := req.Header.Get("Sec-Websocket-Protocol"); hdr != "" {
upgradeHeader.Set("Sec-Websocket-Protocol", hdr)
}
ws, err := upgrader.Upgrade(rw, req, upgradeHeader)
if err != nil {
log.Printf("wsproxy: couldn't upgrade %v", err)
return
}
defer ws.Close()
backend, err := net.ListenPacket("udp", "0.0.0.0:0")
if err != nil {
return
}
defer backend.Close()
errc := make(chan error, 1)
go func() {
for {
_, msg, err := ws.ReadMessage()
if err != nil {
m := websocket.FormatCloseMessage(websocket.CloseNormalClosure, fmt.Sprintf("%v", err))
if e, ok := err.(*websocket.CloseError); ok {
if e.Code != websocket.CloseNoStatusReceived {
m = websocket.FormatCloseMessage(e.Code, e.Text)
}
}
errc <- err
ws.WriteMessage(websocket.CloseMessage, m)
return
}
if bytes.HasPrefix(msg, []byte("\xff\xff\xff\xffport")) {
continue
}
if err := backend.SetWriteDeadline(time.Now().Add(5 * time.Second)); err != nil {
errc <- err
return
}
_, err = backend.WriteTo(msg, w.addr)
if err != nil {
errc <- err
return
}
}
}()
go func() {
buffer := make([]byte, 1024*1024)
for {
n, _, err := backend.ReadFrom(buffer)
if err != nil {
errc <- err
return
}
if err := ws.WriteMessage(websocket.BinaryMessage, buffer[:n]); err != nil {
errc <- err
return
}
}
}()
select {
case err = <-errc:
if e, ok := err.(*websocket.CloseError); !ok || e.Code == websocket.CloseAbnormalClosure {
log.Printf("wsproxy: %v", err)
}
case <-ctx.Done():
return
}
}