package tunnel import ( "bufio" "errors" "io" "net" "net/http" "strings" "time" adapters "github.com/Dreamacro/clash/adapters/inbound" "github.com/Dreamacro/clash/component/resolver" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/common/pool" ) func handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) { req := request.R host := req.Host inboundReader := bufio.NewReader(request) outboundReader := 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(outboundReader, req) if err != nil { break } 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 } // even if resp.Write write body to the connection, but some http request have to Copy to close it buf := pool.Get(pool.RelayBufferSize) _, err = io.CopyBuffer(request, resp.Body, buf) pool.Put(buf) if err != nil && err != io.EOF { break } req, err = http.ReadRequest(inboundReader) 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 handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) error { defer packet.Drop() // local resolve UDP dns if !metadata.Resolved() { ip, err := resolver.ResolveIP(metadata.Host) if err != nil { return err } metadata.DstIP = ip } addr := metadata.UDPAddr() if addr == nil { return errors.New("udp addr invalid") } _, err := pc.WriteTo(packet.Data(), addr) return err } func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, fAddr net.Addr) { buf := pool.Get(pool.RelayBufferSize) defer pool.Put(buf) defer natTable.Delete(key) defer pc.Close() for { pc.SetReadDeadline(time.Now().Add(udpTimeout)) n, from, err := pc.ReadFrom(buf) if err != nil { return } if fAddr != nil { from = fAddr } _, err = packet.WriteBack(buf[:n], from) if err != nil { return } } } func 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.Get(pool.RelayBufferSize) _, err := io.CopyBuffer(leftConn, rightConn, buf) pool.Put(buf) leftConn.SetReadDeadline(time.Now()) ch <- err }() buf := pool.Get(pool.RelayBufferSize) io.CopyBuffer(rightConn, leftConn, buf) pool.Put(buf) rightConn.SetReadDeadline(time.Now()) <-ch }