package tunnel import ( "bufio" "io" "net" "net/http" "strings" "time" adapters "github.com/Dreamacro/clash/adapters/inbound" "github.com/Dreamacro/clash/common/pool" ) func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) { req := request.R host := req.Host inboundReeder := bufio.NewReader(request) outboundReeder := bufio.NewReader(outbound) for { keepAlive := strings.TrimSpace(strings.ToLower(req.Header.Get("Proxy-Connection"))) == "keep-alive" req.Header.Set("Connection", "close") req.RequestURI = "" adapters.RemoveHopByHopHeaders(req.Header) err := req.Write(outbound) if err != nil { break } handleResponse: resp, err := http.ReadResponse(outboundReeder, req) if err != nil { break } defer resp.Body.Close() adapters.RemoveHopByHopHeaders(resp.Header) if resp.StatusCode == http.StatusContinue { err = resp.Write(request) if err != nil { break } goto handleResponse } if keepAlive || resp.ContentLength >= 0 { resp.Header.Set("Proxy-Connection", "keep-alive") resp.Header.Set("Connection", "keep-alive") resp.Header.Set("Keep-Alive", "timeout=4") resp.Close = false } else { resp.Close = true } err = resp.Write(request) if err != nil || resp.Close { break } buf := pool.BufPool.Get().([]byte) _, err = io.CopyBuffer(request, resp.Body, buf) pool.BufPool.Put(buf[:cap(buf)]) if err != nil && err != io.EOF { break } req, err = http.ReadRequest(inboundReeder) if err != nil { break } // Sometimes firefox just open a socket to process multiple domains in HTTP // The temporary solution is close connection when encountering different HOST if req.Host != host { break } } } func (t *Tunnel) handleUDPToRemote(conn net.Conn, pc net.PacketConn, addr net.Addr) { buf := pool.BufPool.Get().([]byte) defer pool.BufPool.Put(buf[:cap(buf)]) n, err := conn.Read(buf) if err != nil { return } if _, err = pc.WriteTo(buf[:n], addr); err != nil { return } DefaultManager.Upload() <- int64(n) } func (t *Tunnel) handleUDPToLocal(conn net.Conn, pc net.PacketConn, key string, timeout time.Duration) { buf := pool.BufPool.Get().([]byte) defer pool.BufPool.Put(buf[:cap(buf)]) defer t.natTable.Delete(key) defer pc.Close() for { pc.SetReadDeadline(time.Now().Add(timeout)) n, _, err := pc.ReadFrom(buf) if err != nil { return } n, err = conn.Write(buf[:n]) if err != nil { return } DefaultManager.Download() <- int64(n) } } func (t *Tunnel) handleSocket(request *adapters.SocketAdapter, outbound net.Conn) { relay(request, outbound) } // relay copies between left and right bidirectionally. func relay(leftConn, rightConn net.Conn) { ch := make(chan error) go func() { buf := pool.BufPool.Get().([]byte) _, err := io.CopyBuffer(leftConn, rightConn, buf) pool.BufPool.Put(buf[:cap(buf)]) leftConn.SetReadDeadline(time.Now()) ch <- err }() buf := pool.BufPool.Get().([]byte) io.CopyBuffer(rightConn, leftConn, buf) pool.BufPool.Put(buf[:cap(buf)]) rightConn.SetReadDeadline(time.Now()) <-ch }