ginuerzh
305 lines
7.2 KiB
Go
305 lines
7.2 KiB
Go
package remote
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import (
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"bufio"
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"bytes"
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"context"
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"errors"
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"fmt"
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"net"
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"strconv"
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"time"
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"github.com/go-gost/core/chain"
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"github.com/go-gost/core/handler"
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"github.com/go-gost/core/hop"
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mdata "github.com/go-gost/core/metadata"
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"github.com/go-gost/core/observer/stats"
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"github.com/go-gost/core/recorder"
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ctxvalue "github.com/go-gost/x/ctx"
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xnet "github.com/go-gost/x/internal/net"
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"github.com/go-gost/x/internal/net/proxyproto"
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"github.com/go-gost/x/internal/util/forwarder"
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"github.com/go-gost/x/internal/util/sniffing"
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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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mdutil "github.com/go-gost/x/metadata/util"
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stats_wrapper "github.com/go-gost/x/observer/stats/wrapper"
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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("rtcp", NewHandler)
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registry.HandlerRegistry().Register("rudp", NewHandler)
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}
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type forwardHandler struct {
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hop hop.Hop
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md metadata
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options handler.Options
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recorder recorder.RecorderObject
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certPool tls_util.CertPool
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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 &forwardHandler{
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options: options,
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}
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}
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func (h *forwardHandler) Init(md mdata.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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if h.md.certificate != nil && h.md.privateKey != nil {
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h.certPool = tls_util.NewMemoryCertPool()
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}
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return
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}
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// Forward implements handler.Forwarder.
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func (h *forwardHandler) Forward(hop hop.Hop) {
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h.hop = hop
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}
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func (h *forwardHandler) 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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RemoteAddr: conn.RemoteAddr().String(),
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LocalAddr: conn.LocalAddr().String(),
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Network: "tcp",
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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 = conn.RemoteAddr().String()
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if clientAddr := ctxvalue.ClientAddrFromContext(ctx); clientAddr != "" {
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ro.ClientIP = string(clientAddr)
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} else {
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ctx = ctxvalue.ContextWithClientAddr(ctx, ctxvalue.ClientAddr(conn.RemoteAddr().String()))
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}
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if h, _, _ := net.SplitHostPort(ro.ClientIP); h != "" {
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ro.ClientIP = h
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}
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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": ro.SID,
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"client": ro.ClientIP,
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})
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log.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
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network := "tcp"
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if _, ok := conn.(net.PacketConn); ok {
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network = "udp"
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}
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ro.Network = network
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pStats := stats.Stats{}
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conn = stats_wrapper.WrapConn(conn, &pStats)
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defer func() {
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if err != nil {
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ro.Err = err.Error()
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}
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ro.InputBytes = pStats.Get(stats.KindInputBytes)
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ro.OutputBytes = pStats.Get(stats.KindOutputBytes)
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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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log.WithFields(map[string]any{
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"duration": time.Since(start),
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"inputBytes": ro.InputBytes,
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"outputBytes": ro.OutputBytes,
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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 host string
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if md, ok := conn.(mdata.Metadatable); ok {
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if v := mdutil.GetString(md.Metadata(), "host"); v != "" {
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host = v
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}
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}
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var proto string
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if network == "tcp" && 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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br := bufio.NewReader(conn)
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proto, _ = sniffing.Sniff(ctx, br)
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ro.Proto = proto
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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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dial := func(ctx context.Context, network, address string) (net.Conn, error) {
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var buf bytes.Buffer
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cc, err := h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &buf), "tcp", address)
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ro.Route = buf.String()
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return cc, err
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}
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sniffer := &forwarder.Sniffer{
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Websocket: h.md.sniffingWebsocket,
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WebsocketSampleRate: h.md.sniffingWebsocketSampleRate,
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Recorder: h.recorder.Recorder,
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RecorderOptions: h.recorder.Options,
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Certificate: h.md.certificate,
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PrivateKey: h.md.privateKey,
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NegotiatedProtocol: h.md.alpn,
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CertPool: h.certPool,
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MitmBypass: h.md.mitmBypass,
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ReadTimeout: h.md.readTimeout,
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}
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conn = xnet.NewReadWriteConn(br, conn, conn)
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switch proto {
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case sniffing.ProtoHTTP:
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return sniffer.HandleHTTP(ctx, conn,
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forwarder.WithDial(dial),
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forwarder.WithHop(h.hop),
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forwarder.WithBypass(h.options.Bypass),
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forwarder.WithHTTPKeepalive(h.md.httpKeepalive),
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forwarder.WithRecorderObject(ro),
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forwarder.WithLog(log),
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)
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case sniffing.ProtoTLS:
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return sniffer.HandleTLS(ctx, conn,
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forwarder.WithDial(dial),
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forwarder.WithHop(h.hop),
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forwarder.WithBypass(h.options.Bypass),
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forwarder.WithRecorderObject(ro),
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forwarder.WithLog(log),
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)
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}
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}
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var target *chain.Node
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if host != "" {
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target = &chain.Node{
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Addr: host,
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}
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}
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if h.hop != nil {
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target = h.hop.Select(ctx,
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hop.ProtocolSelectOption(proto),
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)
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}
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if target == nil {
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err := errors.New("node not available")
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log.Error(err)
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return err
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}
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if opts := target.Options(); opts != nil {
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switch opts.Network {
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case "unix":
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network = opts.Network
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default:
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}
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}
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ro.Network = network
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ro.Host = target.Addr
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log = log.WithFields(map[string]any{
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"node": target.Name,
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"dst": fmt.Sprintf("%s/%s", target.Addr, network),
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})
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log.Debugf("%s >> %s", conn.RemoteAddr(), target.Addr)
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var buf bytes.Buffer
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cc, err := h.options.Router.Dial(ctxvalue.ContextWithBuffer(ctx, &buf), network, target.Addr)
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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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// TODO: the router itself may be failed due to the failed node in the router,
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// the dead marker may be a wrong operation.
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if marker := target.Marker(); marker != nil {
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marker.Mark()
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}
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return err
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}
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defer cc.Close()
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if marker := target.Marker(); marker != nil {
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marker.Reset()
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}
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cc = proxyproto.WrapClientConn(h.md.proxyProtocol, conn.RemoteAddr(), convertAddr(conn.LocalAddr()), cc)
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t := time.Now()
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log.Infof("%s <-> %s", conn.RemoteAddr(), target.Addr)
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xnet.Transport(conn, 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(), target.Addr)
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return nil
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}
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func (h *forwardHandler) 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 convertAddr(addr net.Addr) net.Addr {
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host, sp, _ := net.SplitHostPort(addr.String())
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ip := net.ParseIP(host)
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port, _ := strconv.Atoi(sp)
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if ip == nil || ip.Equal(net.IPv6zero) {
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ip = net.IPv4zero
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}
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switch addr.Network() {
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case "tcp", "tcp4", "tcp6":
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return &net.TCPAddr{
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IP: ip,
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Port: port,
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}
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default:
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return &net.UDPAddr{
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IP: ip,
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Port: port,
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}
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}
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}
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