mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-05 09:47:56 -05:00
315 lines
8.4 KiB
Go
Executable File
315 lines
8.4 KiB
Go
Executable File
package http
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import (
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"bufio"
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"context"
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"encoding/base64"
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"io"
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"net/http"
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"strconv"
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"strings"
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"time"
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"v2ray.com/core"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/errors"
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"v2ray.com/core/common/log"
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"v2ray.com/core/common/net"
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http_proto "v2ray.com/core/common/protocol/http"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/transport/internet"
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)
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// Server is an HTTP proxy server.
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type Server struct {
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config *ServerConfig
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v *core.Instance
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}
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// NewServer creates a new HTTP inbound handler.
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func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
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s := &Server{
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config: config,
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v: core.MustFromContext(ctx),
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}
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return s, nil
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}
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func (s *Server) policy() core.Policy {
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config := s.config
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p := s.v.PolicyManager().ForLevel(config.UserLevel)
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if config.Timeout > 0 && config.UserLevel == 0 {
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p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second
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}
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return p
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}
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func (*Server) Network() net.NetworkList {
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return net.NetworkList{
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Network: []net.Network{net.Network_TCP},
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}
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}
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func parseHost(rawHost string, defaultPort net.Port) (net.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 net.Destination{}, err
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}
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} else if len(rawPort) > 0 {
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intPort, err := strconv.Atoi(rawPort)
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if err != nil {
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return net.Destination{}, err
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}
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port = net.Port(intPort)
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}
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return net.TCPDestination(net.ParseAddress(host), port), nil
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}
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func isTimeout(err error) bool {
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nerr, ok := errors.Cause(err).(net.Error)
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return ok && nerr.Timeout()
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}
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func parseBasicAuth(auth string) (username, password string, ok bool) {
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const prefix = "Basic "
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if !strings.HasPrefix(auth, prefix) {
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return
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}
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c, err := base64.StdEncoding.DecodeString(auth[len(prefix):])
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if err != nil {
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return
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}
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cs := string(c)
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s := strings.IndexByte(cs, ':')
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if s < 0 {
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return
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}
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return cs[:s], cs[s+1:], true
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}
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type readerOnly struct {
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io.Reader
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}
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func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher core.Dispatcher) error {
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reader := bufio.NewReaderSize(readerOnly{conn}, buf.Size)
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Start:
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conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake))
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request, err := http.ReadRequest(reader)
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if err != nil {
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trace := newError("failed to read http request").Base(err)
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if errors.Cause(err) != io.EOF && !isTimeout(errors.Cause(err)) {
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trace.AtWarning()
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}
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return trace
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}
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if len(s.config.Accounts) > 0 {
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user, pass, ok := parseBasicAuth(request.Header.Get("Proxy-Authorization"))
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if !ok || !s.config.HasAccount(user, pass) {
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return common.Error2(conn.Write([]byte("HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic realm=\"proxy\"\r\n\r\n")))
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}
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}
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newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]").WithContext(ctx).WriteToLog()
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conn.SetReadDeadline(time.Time{})
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defaultPort := net.Port(80)
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if strings.ToLower(request.URL.Scheme) == "https" {
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defaultPort = net.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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return newError("malformed proxy host: ", host).AtWarning().Base(err)
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}
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log.Record(&log.AccessMessage{
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From: conn.RemoteAddr(),
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To: request.URL,
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Status: log.AccessAccepted,
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})
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if strings.ToUpper(request.Method) == "CONNECT" {
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return s.handleConnect(ctx, request, reader, conn, dest, dispatcher)
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}
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keepAlive := (strings.TrimSpace(strings.ToLower(request.Header.Get("Proxy-Connection"))) == "keep-alive")
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err = s.handlePlainHTTP(ctx, request, conn, dest, dispatcher)
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if err == errWaitAnother {
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if keepAlive {
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goto Start
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}
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err = nil
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}
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return err
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}
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func (s *Server) handleConnect(ctx context.Context, request *http.Request, reader *bufio.Reader, conn internet.Connection, dest net.Destination, dispatcher core.Dispatcher) error {
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_, err := conn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n"))
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if err != nil {
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return newError("failed to write back OK response").Base(err)
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, s.policy().Timeouts.ConnectionIdle)
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ray, err := dispatcher.Dispatch(ctx, dest)
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if err != nil {
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return err
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}
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if reader.Buffered() > 0 {
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payload, err := buf.ReadSizeToMultiBuffer(reader, int32(reader.Buffered()))
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if err != nil {
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return err
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}
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if err := ray.InboundInput().WriteMultiBuffer(payload); err != nil {
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return err
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}
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reader = nil
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}
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requestDone := func() error {
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defer ray.InboundInput().Close()
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defer timer.SetTimeout(s.policy().Timeouts.DownlinkOnly)
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v2reader := buf.NewReader(conn)
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return buf.Copy(v2reader, ray.InboundInput(), buf.UpdateActivity(timer))
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}
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responseDone := func() error {
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defer timer.SetTimeout(s.policy().Timeouts.UplinkOnly)
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v2writer := buf.NewWriter(conn)
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if err := buf.Copy(ray.InboundOutput(), v2writer, buf.UpdateActivity(timer)); err != nil {
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return err
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}
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return nil
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}
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if err := signal.ExecuteParallel(ctx, requestDone, responseDone); err != nil {
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ray.InboundInput().CloseError()
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ray.InboundOutput().CloseError()
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return newError("connection ends").Base(err)
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}
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return nil
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}
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var errWaitAnother = newError("keep alive")
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func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, writer io.Writer, dest net.Destination, dispatcher core.Dispatcher) error {
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if !s.config.AllowTransparent && len(request.URL.Host) <= 0 {
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// RFC 2068 (HTTP/1.1) requires URL to be absolute URL in HTTP proxy.
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response := &http.Response{
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Status: "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: http.Header(make(map[string][]string)),
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Body: nil,
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ContentLength: 0,
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Close: true,
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}
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response.Header.Set("Proxy-Connection", "close")
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response.Header.Set("Connection", "close")
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return response.Write(writer)
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}
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if len(request.URL.Host) > 0 {
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request.Host = request.URL.Host
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}
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http_proto.RemoveHopByHopHeaders(request.Header)
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// Prevent UA from being set to golang's default ones
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if len(request.Header.Get("User-Agent")) == 0 {
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request.Header.Set("User-Agent", "")
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}
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ray, err := dispatcher.Dispatch(ctx, dest)
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if err != nil {
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return err
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}
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input := ray.InboundInput()
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output := ray.InboundOutput()
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defer input.Close()
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var result error = errWaitAnother
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requestDone := func() error {
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request.Header.Set("Connection", "close")
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requestWriter := buf.NewBufferedWriter(ray.InboundInput())
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common.Must(requestWriter.SetBuffered(false))
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if err := request.Write(requestWriter); err != nil {
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return newError("failed to write whole request").Base(err).AtWarning()
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}
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return nil
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}
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responseDone := func() error {
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responseReader := bufio.NewReaderSize(buf.NewBufferedReader(ray.InboundOutput()), buf.Size)
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response, err := http.ReadResponse(responseReader, request)
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if err == nil {
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http_proto.RemoveHopByHopHeaders(response.Header)
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if response.ContentLength >= 0 {
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response.Header.Set("Proxy-Connection", "keep-alive")
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response.Header.Set("Connection", "keep-alive")
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response.Header.Set("Keep-Alive", "timeout=4")
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response.Close = false
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} else {
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response.Close = true
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result = nil
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}
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} else {
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newError("failed to read response from ", request.Host).Base(err).AtWarning().WithContext(ctx).WriteToLog()
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response = &http.Response{
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Status: "Service Unavailable",
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StatusCode: 503,
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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: true,
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}
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response.Header.Set("Connection", "close")
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response.Header.Set("Proxy-Connection", "close")
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}
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if err := response.Write(writer); err != nil {
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return newError("failed to write response").Base(err).AtWarning()
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}
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return nil
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}
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if err := signal.ExecuteParallel(ctx, requestDone, responseDone); err != nil {
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input.CloseError()
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output.CloseError()
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return newError("connection ends").Base(err)
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}
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return result
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}
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func init() {
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common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewServer(ctx, config.(*ServerConfig))
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}))
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}
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