mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-09-06 03:54:22 -04:00
248 lines
6.1 KiB
Go
248 lines
6.1 KiB
Go
package http
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import (
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"bufio"
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"io"
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"net"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"github.com/v2ray/v2ray-core/app"
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"github.com/v2ray/v2ray-core/common/alloc"
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"github.com/v2ray/v2ray-core/common/log"
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v2net "github.com/v2ray/v2ray-core/common/net"
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"github.com/v2ray/v2ray-core/common/retry"
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"github.com/v2ray/v2ray-core/transport/ray"
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)
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type HttpProxyServer struct {
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sync.Mutex
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accepting bool
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space app.Space
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config Config
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tcpListener *net.TCPListener
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}
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func NewHttpProxyServer(space app.Space, config Config) *HttpProxyServer {
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return &HttpProxyServer{
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space: space,
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config: config,
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}
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}
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func (this *HttpProxyServer) Close() {
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this.accepting = false
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if this.tcpListener != nil {
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this.tcpListener.Close()
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this.Lock()
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this.tcpListener = nil
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this.Unlock()
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}
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}
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func (this *HttpProxyServer) Listen(port v2net.Port) error {
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tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
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Port: int(port.Value()),
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IP: []byte{0, 0, 0, 0},
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})
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if err != nil {
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return err
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}
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this.Lock()
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this.tcpListener = tcpListener
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this.Unlock()
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this.accepting = true
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go this.accept()
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return nil
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}
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func (this *HttpProxyServer) accept() {
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for this.accepting {
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retry.Timed(100 /* times */, 100 /* ms */).On(func() error {
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this.Lock()
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defer this.Unlock()
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if !this.accepting {
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return nil
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}
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tcpConn, err := this.tcpListener.AcceptTCP()
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if err != nil {
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log.Error("Failed to accept HTTP connection: %v", err)
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return err
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}
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go this.handleConnection(tcpConn)
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return nil
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})
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}
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}
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func parseHost(rawHost string, defaultPort v2net.Port) (v2net.Destination, error) {
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port := defaultPort
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host, rawPort, err := net.SplitHostPort(rawHost)
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if err != nil {
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if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") {
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host = rawHost
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} else {
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return nil, err
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}
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} else {
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intPort, err := strconv.Atoi(rawPort)
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if err != nil {
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return nil, err
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}
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port = v2net.Port(intPort)
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}
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if ip := net.ParseIP(host); ip != nil {
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return v2net.TCPDestination(v2net.IPAddress(ip), port), nil
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}
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return v2net.TCPDestination(v2net.DomainAddress(host), port), nil
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}
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func (this *HttpProxyServer) handleConnection(conn *net.TCPConn) {
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defer conn.Close()
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reader := bufio.NewReader(conn)
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request, err := http.ReadRequest(reader)
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if err != nil {
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log.Warning("Failed to read http request: %v", err)
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return
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}
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log.Info("Request to Method [%s] Host [%s] with URL [%s]", request.Method, request.Host, request.URL.String())
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defaultPort := v2net.Port(80)
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if strings.ToLower(request.URL.Scheme) == "https" {
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defaultPort = v2net.Port(443)
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}
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host := request.Host
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if len(host) == 0 {
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host = request.URL.Host
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}
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dest, err := parseHost(host, defaultPort)
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if err != nil {
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log.Warning("Malformed proxy host (%s): %v", host, err)
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return
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}
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if strings.ToUpper(request.Method) == "CONNECT" {
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this.handleConnect(request, dest, reader, conn)
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} else {
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this.handlePlainHTTP(request, dest, reader, conn)
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}
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}
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func (this *HttpProxyServer) handleConnect(request *http.Request, destination v2net.Destination, reader io.Reader, writer io.Writer) {
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response := &http.Response{
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Status: "200 OK",
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StatusCode: 200,
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Proto: "HTTP/1.1",
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ProtoMajor: 1,
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ProtoMinor: 1,
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Header: http.Header(make(map[string][]string)),
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Body: nil,
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ContentLength: 0,
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Close: false,
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}
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buffer := alloc.NewSmallBuffer().Clear()
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response.Write(buffer)
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writer.Write(buffer.Value)
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buffer.Release()
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packet := v2net.NewPacket(destination, nil, true)
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ray := this.space.PacketDispatcher().DispatchToOutbound(packet)
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this.transport(reader, writer, ray)
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}
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func (this *HttpProxyServer) transport(input io.Reader, output io.Writer, ray ray.InboundRay) {
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var wg sync.WaitGroup
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wg.Add(2)
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defer wg.Wait()
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go func() {
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v2net.ReaderToChan(ray.InboundInput(), input)
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close(ray.InboundInput())
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wg.Done()
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}()
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go func() {
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v2net.ChanToWriter(output, ray.InboundOutput())
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wg.Done()
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}()
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}
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func stripHopByHopHeaders(request *http.Request) {
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// Strip hop-by-hop header basaed on RFC:
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
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// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
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request.Header.Del("Proxy-Connection")
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request.Header.Del("Proxy-Authenticate")
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request.Header.Del("Proxy-Authorization")
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request.Header.Del("TE")
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request.Header.Del("Trailers")
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request.Header.Del("Transfer-Encoding")
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request.Header.Del("Upgrade")
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// TODO: support keep-alive
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connections := request.Header.Get("Connection")
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request.Header.Set("Connection", "close")
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if len(connections) == 0 {
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return
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}
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for _, h := range strings.Split(connections, ",") {
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request.Header.Del(strings.TrimSpace(h))
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}
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}
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func (this *HttpProxyServer) handlePlainHTTP(request *http.Request, dest v2net.Destination, reader *bufio.Reader, writer io.Writer) {
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if len(request.URL.Host) <= 0 {
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hdr := http.Header(make(map[string][]string))
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hdr.Set("Connection", "close")
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response := &http.Response{
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Status: "400 Bad Request",
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StatusCode: 400,
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Proto: "HTTP/1.1",
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ProtoMajor: 1,
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ProtoMinor: 1,
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Header: hdr,
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Body: nil,
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ContentLength: 0,
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Close: false,
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}
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buffer := alloc.NewSmallBuffer().Clear()
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response.Write(buffer)
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writer.Write(buffer.Value)
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buffer.Release()
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return
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}
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request.Host = request.URL.Host
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stripHopByHopHeaders(request)
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requestBuffer := alloc.NewBuffer().Clear() // Don't release this buffer as it is passed into a Packet.
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request.Write(requestBuffer)
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log.Debug("Request to remote:\n%s", string(requestBuffer.Value))
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packet := v2net.NewPacket(dest, requestBuffer, true)
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ray := this.space.PacketDispatcher().DispatchToOutbound(packet)
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defer close(ray.InboundInput())
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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responseReader := bufio.NewReader(NewChanReader(ray.InboundOutput()))
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response, err := http.ReadResponse(responseReader, request)
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if err != nil {
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return
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}
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responseBuffer := alloc.NewBuffer().Clear()
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defer responseBuffer.Release()
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response.Write(responseBuffer)
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writer.Write(responseBuffer.Value)
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response.Body.Close()
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}()
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wg.Wait()
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}
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