ginuerzh
376 lines
8.7 KiB
Go
376 lines
8.7 KiB
Go
package redirect
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/tls"
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"encoding/binary"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/http/httputil"
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"strings"
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"time"
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"github.com/go-gost/core/bypass"
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"github.com/go-gost/core/handler"
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"github.com/go-gost/core/logger"
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md "github.com/go-gost/core/metadata"
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"github.com/go-gost/core/recorder"
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dissector "github.com/go-gost/tls-dissector"
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xbypass "github.com/go-gost/x/bypass"
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ctxvalue "github.com/go-gost/x/ctx"
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xio "github.com/go-gost/x/internal/io"
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netpkg "github.com/go-gost/x/internal/net"
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xhttp "github.com/go-gost/x/internal/net/http"
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rate_limiter "github.com/go-gost/x/limiter/rate"
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xrecorder "github.com/go-gost/x/recorder"
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"github.com/go-gost/x/registry"
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)
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func init() {
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registry.HandlerRegistry().Register("red", NewHandler)
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registry.HandlerRegistry().Register("redir", NewHandler)
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registry.HandlerRegistry().Register("redirect", NewHandler)
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}
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type redirectHandler struct {
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md metadata
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options handler.Options
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recorder recorder.RecorderObject
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}
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func NewHandler(opts ...handler.Option) handler.Handler {
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options := handler.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &redirectHandler{
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options: options,
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}
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}
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func (h *redirectHandler) Init(md md.Metadata) (err error) {
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if err = h.parseMetadata(md); err != nil {
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return
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}
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for _, ro := range h.options.Recorders {
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if ro.Record == xrecorder.RecorderServiceHandler {
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h.recorder = ro
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break
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}
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}
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return
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}
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func (h *redirectHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) (err error) {
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defer conn.Close()
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start := time.Now()
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ro := &xrecorder.HandlerRecorderObject{
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Service: h.options.Service,
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Network: "tcp",
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RemoteAddr: conn.RemoteAddr().String(),
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LocalAddr: conn.LocalAddr().String(),
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Time: start,
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SID: string(ctxvalue.SidFromContext(ctx)),
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}
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ro.ClientIP, _, _ = net.SplitHostPort(conn.RemoteAddr().String())
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log := h.options.Logger.WithFields(map[string]any{
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"remote": conn.RemoteAddr().String(),
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"local": conn.LocalAddr().String(),
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"sid": ctxvalue.SidFromContext(ctx),
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})
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log.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
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defer func() {
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if !ro.Time.IsZero() {
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if err != nil {
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ro.Err = err.Error()
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}
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ro.Duration = time.Since(start)
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ro.Record(ctx, h.recorder.Recorder)
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}
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log.WithFields(map[string]any{
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"duration": time.Since(start),
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}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
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}()
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if !h.checkRateLimit(conn.RemoteAddr()) {
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return rate_limiter.ErrRateLimit
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}
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var dstAddr net.Addr
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if h.md.tproxy {
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dstAddr = conn.LocalAddr()
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} else {
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dstAddr, err = h.getOriginalDstAddr(conn)
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if err != nil {
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log.Error(err)
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return
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}
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}
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ro.Host = dstAddr.String()
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log = log.WithFields(map[string]any{
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"dst": fmt.Sprintf("%s/%s", dstAddr, dstAddr.Network()),
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})
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var rw io.ReadWriter = conn
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if h.md.sniffing {
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if h.md.sniffingTimeout > 0 {
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conn.SetReadDeadline(time.Now().Add(h.md.sniffingTimeout))
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}
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// try to sniff TLS traffic
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var hdr [dissector.RecordHeaderLen]byte
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n, err := io.ReadFull(rw, hdr[:])
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if h.md.sniffingTimeout > 0 {
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conn.SetReadDeadline(time.Time{})
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}
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rw = xio.NewReadWriter(io.MultiReader(bytes.NewReader(hdr[:n]), rw), rw)
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tlsVersion := binary.BigEndian.Uint16(hdr[1:3])
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if err == nil &&
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hdr[0] == dissector.Handshake &&
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(tlsVersion >= tls.VersionTLS10 && tlsVersion <= tls.VersionTLS13) {
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return h.handleHTTPS(ctx, rw, conn.RemoteAddr(), dstAddr, log)
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}
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// try to sniff HTTP traffic
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if isHTTP(string(hdr[:])) {
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return h.handleHTTP(ctx, rw, conn.RemoteAddr(), dstAddr, ro, log)
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}
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}
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log.Debugf("%s >> %s", conn.RemoteAddr(), dstAddr)
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if h.options.Bypass != nil && h.options.Bypass.Contains(ctx, dstAddr.Network(), dstAddr.String()) {
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log.Debug("bypass: ", dstAddr)
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return xbypass.ErrBypass
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}
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cc, err := h.options.Router.Dial(ctx, dstAddr.Network(), dstAddr.String())
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if err != nil {
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log.Error(err)
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return err
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}
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defer cc.Close()
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t := time.Now()
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log.Infof("%s <-> %s", conn.RemoteAddr(), dstAddr)
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netpkg.Transport(rw, cc)
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log.WithFields(map[string]any{
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"duration": time.Since(t),
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}).Infof("%s >-< %s", conn.RemoteAddr(), dstAddr)
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return nil
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}
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func (h *redirectHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, raddr, dstAddr net.Addr, ro *xrecorder.HandlerRecorderObject, log logger.Logger) error {
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req, err := http.ReadRequest(bufio.NewReader(rw))
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if err != nil {
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return err
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}
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ro.HTTP = &xrecorder.HTTPRecorderObject{
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Host: req.Host,
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Proto: req.Proto,
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Scheme: req.URL.Scheme,
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Method: req.Method,
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URI: req.RequestURI,
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Request: xrecorder.HTTPRequestRecorderObject{
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ContentLength: req.ContentLength,
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Header: req.Header,
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},
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}
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if clientIP := xhttp.GetClientIP(req); clientIP != nil {
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ro.ClientIP = clientIP.String()
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}
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if log.IsLevelEnabled(logger.TraceLevel) {
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dump, _ := httputil.DumpRequest(req, false)
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log.Trace(string(dump))
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}
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ro.Host = req.Host
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host := req.Host
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if _, _, err := net.SplitHostPort(host); err != nil {
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host = net.JoinHostPort(strings.Trim(host, "[]"), "80")
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}
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log = log.WithFields(map[string]any{
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"host": host,
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})
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if h.options.Bypass != nil && h.options.Bypass.Contains(ctx, "tcp", host, bypass.WithPathOption(req.RequestURI)) {
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log.Debugf("bypass: %s %s", host, req.RequestURI)
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return xbypass.ErrBypass
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}
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cc, err := h.options.Router.Dial(ctx, "tcp", host)
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if err != nil {
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log.Error(err)
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if !h.md.sniffingFallback {
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return err
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}
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}
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if cc == nil {
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cc, err = h.options.Router.Dial(ctx, "tcp", dstAddr.String())
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if err != nil {
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log.Error(err)
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return err
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}
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}
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defer cc.Close()
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t := time.Now()
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log.Infof("%s <-> %s", raddr, host)
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defer func() {
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log.WithFields(map[string]any{
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"duration": time.Since(t),
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}).Infof("%s >-< %s", raddr, host)
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}()
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if err := req.Write(cc); err != nil {
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log.Error(err)
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return err
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}
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br := bufio.NewReader(cc)
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resp, err := http.ReadResponse(br, req)
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if err != nil {
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log.Error(err)
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return err
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}
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defer resp.Body.Close()
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ro.HTTP.StatusCode = resp.StatusCode
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ro.HTTP.Response.ContentLength = resp.ContentLength
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ro.HTTP.Response.Header = resp.Header
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if log.IsLevelEnabled(logger.TraceLevel) {
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dump, _ := httputil.DumpResponse(resp, false)
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log.Trace(string(dump))
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}
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if err := resp.Write(rw); err != nil {
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log.Error(err)
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return err
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}
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netpkg.Transport(rw, xio.NewReadWriter(br, cc))
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return nil
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}
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func (h *redirectHandler) handleHTTPS(ctx context.Context, rw io.ReadWriter, raddr, dstAddr net.Addr, log logger.Logger) error {
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buf := new(bytes.Buffer)
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host, err := h.getServerName(ctx, io.TeeReader(rw, buf))
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if err != nil {
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log.Error(err)
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return err
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}
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var cc io.ReadWriteCloser
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if host != "" {
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if _, _, err := net.SplitHostPort(host); err != nil {
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_, port, _ := net.SplitHostPort(dstAddr.String())
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if port == "" {
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port = "443"
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}
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host = net.JoinHostPort(strings.Trim(host, "[]"), port)
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}
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log = log.WithFields(map[string]any{
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"host": host,
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})
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if h.options.Bypass != nil && h.options.Bypass.Contains(ctx, "tcp", host) {
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log.Debug("bypass: ", host)
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return nil
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}
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cc, err = h.options.Router.Dial(ctx, "tcp", host)
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if err != nil {
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log.Error(err)
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if !h.md.sniffingFallback {
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return err
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}
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}
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}
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if cc == nil {
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cc, err = h.options.Router.Dial(ctx, "tcp", dstAddr.String())
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if err != nil {
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log.Error(err)
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return err
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}
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}
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defer cc.Close()
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t := time.Now()
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log.Infof("%s <-> %s", raddr, host)
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netpkg.Transport(xio.NewReadWriter(io.MultiReader(buf, rw), rw), cc)
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log.WithFields(map[string]any{
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"duration": time.Since(t),
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}).Infof("%s >-< %s", raddr, host)
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return nil
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}
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func (h *redirectHandler) getServerName(_ context.Context, r io.Reader) (host string, err error) {
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record, err := dissector.ReadRecord(r)
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if err != nil {
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return
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}
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clientHello := dissector.ClientHelloMsg{}
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if err = clientHello.Decode(record.Opaque); err != nil {
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return
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}
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for _, ext := range clientHello.Extensions {
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if ext.Type() == dissector.ExtServerName {
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snExtension := ext.(*dissector.ServerNameExtension)
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host = snExtension.Name
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break
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}
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}
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return
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}
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func (h *redirectHandler) checkRateLimit(addr net.Addr) bool {
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if h.options.RateLimiter == nil {
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return true
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}
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host, _, _ := net.SplitHostPort(addr.String())
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if limiter := h.options.RateLimiter.Limiter(host); limiter != nil {
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return limiter.Allow(1)
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}
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return true
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}
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func isHTTP(s string) bool {
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return strings.HasPrefix(http.MethodGet, s[:3]) ||
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strings.HasPrefix(http.MethodPost, s[:4]) ||
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strings.HasPrefix(http.MethodPut, s[:3]) ||
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strings.HasPrefix(http.MethodDelete, s) ||
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strings.HasPrefix(http.MethodOptions, s) ||
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strings.HasPrefix(http.MethodPatch, s) ||
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strings.HasPrefix(http.MethodHead, s[:4]) ||
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strings.HasPrefix(http.MethodConnect, s) ||
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strings.HasPrefix(http.MethodTrace, s)
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}
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