ginuerzh
577 lines
14 KiB
Go
577 lines
14 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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"encoding/hex"
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"errors"
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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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tls_util "github.com/go-gost/x/internal/util/tls"
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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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const (
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defaultBodySize = 1024 * 1024 // 1MB
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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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if err := ro.Record(ctx, h.recorder.Recorder); err != nil {
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log.Errorf("record: %v", err)
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}
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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.ReadWriteCloser = 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.NewReadWriteCloser(io.MultiReader(bytes.NewReader(hdr[:n]), rw), 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, ro, 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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ro2 := &xrecorder.HandlerRecorderObject{}
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*ro2 = *ro
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ro.Time = time.Time{}
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return h.handleHTTP(ctx, rw, conn.RemoteAddr(), dstAddr, ro2, 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 &&
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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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var buf bytes.Buffer
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cc, err := h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &buf), dstAddr.Network(), dstAddr.String())
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ro.Route = buf.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.ReadWriteCloser, raddr, dstAddr net.Addr, ro *xrecorder.HandlerRecorderObject, log logger.Logger) error {
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br := bufio.NewReader(rw)
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req, err := http.ReadRequest(br)
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if err != nil {
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return err
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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 &&
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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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var buf bytes.Buffer
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cc, err := h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &buf), "tcp", host)
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ro.Route = buf.String()
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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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var buf bytes.Buffer
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cc, err = h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &buf), "tcp", dstAddr.String())
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ro.Route = buf.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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if req.Header.Get("Upgrade") == "websocket" {
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return h.handleWebsocket(ctx, raddr, rw, cc, req, ro, log)
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}
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if err := h.httpRoundTrip(ctx, raddr, rw, cc, req, ro, log); err != nil {
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return err
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}
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for {
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req, err := http.ReadRequest(br)
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if err != nil {
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if errors.Is(err, io.EOF) || errors.Is(err, net.ErrClosed) {
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return nil
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}
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return err
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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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if err = h.httpRoundTrip(ctx, raddr, rw, cc, req, ro, log); err != nil {
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return err
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}
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}
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}
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func (h *redirectHandler) handleWebsocket(ctx context.Context, raddr net.Addr, rw io.ReadWriteCloser, cc io.ReadWriter, req *http.Request, ro *xrecorder.HandlerRecorderObject, log logger.Logger) (err error) {
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start := time.Now()
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ro.Time = start
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log.Infof("%s <-> %s", raddr, req.Host)
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defer func() {
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ro.Duration = time.Since(start)
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if err != nil {
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ro.Err = err.Error()
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}
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if err := ro.Record(ctx, h.recorder.Recorder); err != nil {
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log.Errorf("record: %v", err)
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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", raddr, req.Host)
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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.Clone(),
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},
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}
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if err = req.Write(cc); err != nil {
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return
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}
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res, err := http.ReadResponse(bufio.NewReader(cc), req)
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if err != nil {
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return
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}
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defer res.Body.Close()
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ro.HTTP.StatusCode = res.StatusCode
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ro.HTTP.Response.Header = res.Header
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ro.HTTP.Response.ContentLength = res.ContentLength
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if log.IsLevelEnabled(logger.TraceLevel) {
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dump, _ := httputil.DumpResponse(res, false)
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log.Trace(string(dump))
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}
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if err = res.Write(rw); err != nil {
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return
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}
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netpkg.Transport(rw, cc)
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return
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}
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func (h *redirectHandler) httpRoundTrip(ctx context.Context, raddr net.Addr, rw io.ReadWriteCloser, cc io.ReadWriter, req *http.Request, ro *xrecorder.HandlerRecorderObject, log logger.Logger) (err error) {
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if req == nil {
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return nil
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}
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start := time.Now()
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ro.Time = start
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log.Infof("%s <-> %s", raddr, req.Host)
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defer func() {
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if err != nil {
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ro.Duration = time.Since(start)
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ro.Err = err.Error()
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if err := ro.Record(ctx, h.recorder.Recorder); err != nil {
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log.Errorf("record: %v", err)
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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", raddr, req.Host)
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}
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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.Clone(),
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},
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}
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// HTTP/1.0
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if req.ProtoMajor == 1 && req.ProtoMinor == 0 {
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if strings.ToLower(req.Header.Get("Connection")) == "keep-alive" {
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req.Header.Del("Connection")
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} else {
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req.Header.Set("Connection", "close")
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}
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}
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var reqBody *xhttp.Body
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if opts := h.recorder.Options; opts != nil && opts.HTTPBody {
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if req.Body != nil {
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maxSize := opts.MaxBodySize
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if maxSize <= 0 {
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maxSize = defaultBodySize
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}
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reqBody = xhttp.NewBody(req.Body, maxSize)
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req.Body = reqBody
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}
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}
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if err = req.Write(cc); err != nil {
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return err
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}
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if reqBody != nil {
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ro.HTTP.Request.Body = reqBody.Content()
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ro.HTTP.Request.ContentLength = reqBody.Length()
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}
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go func() {
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var err error
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var res *http.Response
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var respBody *xhttp.Body
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defer func() {
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ro.Duration = time.Since(start)
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if err != nil {
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ro.Err = err.Error()
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}
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if res != nil {
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ro.HTTP.StatusCode = res.StatusCode
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ro.HTTP.Response.Header = res.Header
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ro.HTTP.Response.ContentLength = res.ContentLength
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if respBody != nil {
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ro.HTTP.Response.Body = respBody.Content()
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ro.HTTP.Response.ContentLength = respBody.Length()
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}
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}
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ro.Record(ctx, h.recorder.Recorder)
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}()
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res, err = http.ReadResponse(bufio.NewReader(cc), req)
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if err != nil {
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rw.Close()
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log.Errorf("read response: %v", err)
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return
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}
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defer res.Body.Close()
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if log.IsLevelEnabled(logger.TraceLevel) {
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dump, _ := httputil.DumpResponse(res, false)
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log.Trace(string(dump))
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}
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if res.Close {
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defer rw.Close()
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}
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// HTTP/1.0
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if req.ProtoMajor == 1 && req.ProtoMinor == 0 {
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if !res.Close {
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res.Header.Set("Connection", "keep-alive")
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}
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res.ProtoMajor = req.ProtoMajor
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res.ProtoMinor = req.ProtoMinor
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}
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if opts := h.recorder.Options; opts != nil && opts.HTTPBody {
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maxSize := opts.MaxBodySize
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if maxSize <= 0 {
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maxSize = defaultBodySize
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}
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respBody = xhttp.NewBody(res.Body, maxSize)
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res.Body = respBody
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}
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if err = res.Write(rw); err != nil {
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rw.Close()
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log.Errorf("write response: %v", err)
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}
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}()
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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, ro *xrecorder.HandlerRecorderObject, log logger.Logger) error {
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buf := new(bytes.Buffer)
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clientHello, err := dissector.ParseClientHello(io.TeeReader(rw, buf))
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if err != nil {
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return err
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}
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ro.TLS = &xrecorder.TLSRecorderObject{
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ServerName: clientHello.ServerName,
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ClientHello: hex.EncodeToString(buf.Bytes()),
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}
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if len(clientHello.SupportedProtos) > 0 {
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ro.TLS.Proto = clientHello.SupportedProtos[0]
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}
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var cc io.ReadWriteCloser
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host := clientHello.ServerName
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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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ro.Host = host
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if h.options.Bypass != nil &&
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h.options.Bypass.Contains(ctx, "tcp", host) {
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log.Debug("bypass: ", host)
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return xbypass.ErrBypass
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}
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var routeBuf bytes.Buffer
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cc, err = h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &routeBuf), "tcp", host)
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ro.Route = routeBuf.String()
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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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var routeBuf bytes.Buffer
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cc, err = h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &routeBuf), "tcp", dstAddr.String())
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ro.Route = routeBuf.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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if _, err := buf.WriteTo(cc); err != nil {
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return err
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}
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serverHello, err := dissector.ParseServerHello(io.TeeReader(cc, buf))
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if serverHello != nil {
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ro.TLS.CipherSuite = tls_util.CipherSuite(serverHello.CipherSuite).String()
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ro.TLS.CompressionMethod = serverHello.CompressionMethod
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if serverHello.Proto != "" {
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ro.TLS.Proto = serverHello.Proto
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}
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if serverHello.Version > 0 {
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ro.TLS.Version = tls_util.Version(serverHello.Version).String()
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}
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}
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if buf.Len() > 0 {
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ro.TLS.ServerHello = hex.EncodeToString(buf.Bytes())
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}
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if _, err := buf.WriteTo(rw); err != nil {
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return err
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}
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|
|
t := time.Now()
|
|
log.Infof("%s <-> %s", raddr, host)
|
|
netpkg.Transport(rw, cc)
|
|
log.WithFields(map[string]any{
|
|
"duration": time.Since(t),
|
|
}).Infof("%s >-< %s", raddr, host)
|
|
|
|
return err
|
|
}
|
|
|
|
func (h *redirectHandler) checkRateLimit(addr net.Addr) bool {
|
|
if h.options.RateLimiter == nil {
|
|
return true
|
|
}
|
|
host, _, _ := net.SplitHostPort(addr.String())
|
|
if limiter := h.options.RateLimiter.Limiter(host); limiter != nil {
|
|
return limiter.Allow(1)
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func isHTTP(s string) bool {
|
|
return strings.HasPrefix(http.MethodGet, s[:3]) ||
|
|
strings.HasPrefix(http.MethodPost, s[:4]) ||
|
|
strings.HasPrefix(http.MethodPut, s[:3]) ||
|
|
strings.HasPrefix(http.MethodDelete, s) ||
|
|
strings.HasPrefix(http.MethodOptions, s) ||
|
|
strings.HasPrefix(http.MethodPatch, s) ||
|
|
strings.HasPrefix(http.MethodHead, s[:4]) ||
|
|
strings.HasPrefix(http.MethodConnect, s) ||
|
|
strings.HasPrefix(http.MethodTrace, s)
|
|
}
|