mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-27 04:27:20 -05:00
329 lines
9.3 KiB
Go
329 lines
9.3 KiB
Go
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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"strings"
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"time"
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core "github.com/v2fly/v2ray-core/v5"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/errors"
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"github.com/v2fly/v2ray-core/v5/common/log"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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http_proto "github.com/v2fly/v2ray-core/v5/common/protocol/http"
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"github.com/v2fly/v2ray-core/v5/common/session"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/features/routing"
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"github.com/v2fly/v2ray-core/v5/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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policyManager policy.Manager
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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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v := core.MustFromContext(ctx)
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s := &Server{
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config: config,
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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}
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return s, nil
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}
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func (s *Server) policy() policy.Session {
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config := s.config
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p := s.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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// Network implements proxy.Inbound.
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func (*Server) Network() []net.Network {
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return []net.Network{net.Network_TCP, net.Network_UNIX}
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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 routing.Dispatcher) error {
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inbound := session.InboundFromContext(ctx)
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if inbound != nil {
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inbound.User = &protocol.MemoryUser{
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Level: s.config.UserLevel,
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}
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}
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reader := bufio.NewReaderSize(readerOnly{conn}, buf.Size)
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Start:
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if err := conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake)); err != nil {
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newError("failed to set read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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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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if inbound != nil {
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inbound.User.Email = user
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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, "]").WriteToLog(session.ExportIDToError(ctx))
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if err := conn.SetReadDeadline(time.Time{}); err != nil {
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newError("failed to clear read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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defaultPort := net.Port(80)
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if strings.EqualFold(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 host == "" {
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host = request.URL.Host
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}
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dest, err := http_proto.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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ctx = log.ContextWithAccessMessage(ctx, &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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Reason: "",
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})
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if strings.EqualFold(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, _ *http.Request, reader *bufio.Reader, conn internet.Connection, dest net.Destination, dispatcher routing.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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plcy := s.policy()
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, plcy.Buffer)
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link, 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.ReadFrom(io.LimitReader(reader, int64(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 := link.Writer.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 timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
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return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
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}
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responseDone := func() error {
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defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
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v2writer := buf.NewWriter(conn)
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if err := buf.Copy(link.Reader, 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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closeWriter := task.OnSuccess(requestDone, task.Close(link.Writer))
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if err := task.Run(ctx, closeWriter, responseDone); err != nil {
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common.Interrupt(link.Reader)
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common.Interrupt(link.Writer)
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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 routing.Dispatcher) error {
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if !s.config.AllowTransparent && request.URL.Host == "" {
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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 request.Header.Get("User-Agent") == "" {
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request.Header.Set("User-Agent", "")
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}
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content := &session.Content{
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Protocol: "http/1.1",
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}
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content.SetAttribute(":method", strings.ToUpper(request.Method))
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content.SetAttribute(":path", request.URL.Path)
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for key := range request.Header {
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value := request.Header.Get(key)
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content.SetAttribute(strings.ToLower(key), value)
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}
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ctx = session.ContextWithContent(ctx, content)
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link, 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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// Plain HTTP request is not a stream. The request always finishes before response. Hence, request has to be closed later.
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defer common.Close(link.Writer)
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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(link.Writer)
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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.BufferedReader{Reader: link.Reader}, 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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defer response.Body.Close()
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} else {
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newError("failed to read response from ", request.Host).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
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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 := task.Run(ctx, requestDone, responseDone); err != nil {
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common.Interrupt(link.Reader)
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common.Interrupt(link.Writer)
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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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