159 lines
3.4 KiB
Go
159 lines
3.4 KiB
Go
package local
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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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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md "github.com/go-gost/core/metadata"
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xchain "github.com/go-gost/x/chain"
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netpkg "github.com/go-gost/x/internal/net"
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"github.com/go-gost/x/internal/util/forward"
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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("tcp", NewHandler)
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registry.HandlerRegistry().Register("udp", NewHandler)
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registry.HandlerRegistry().Register("forward", NewHandler)
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}
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type forwardHandler struct {
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hop chain.Hop
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router *chain.Router
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md metadata
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options handler.Options
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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 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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if h.hop == nil {
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// dummy node used by relay connector.
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h.hop = xchain.NewChainHop([]*chain.Node{
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{Name: "dummy", Addr: ":0"},
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})
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}
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h.router = h.options.Router
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if h.router == nil {
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h.router = chain.NewRouter(chain.LoggerRouterOption(h.options.Logger))
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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 chain.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) error {
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defer conn.Close()
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start := time.Now()
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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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})
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log.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
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defer func() {
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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 nil
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}
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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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var rw io.ReadWriter = conn
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var host string
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var protocol string
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if h.md.sniffing {
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if network == "tcp" {
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rw, host, protocol, _ = forward.Sniffing(ctx, conn)
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h.options.Logger.Debugf("sniffing: host=%s, protocol=%s", host, protocol)
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}
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}
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var target *chain.Node
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if h.hop != nil {
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target = h.hop.Select(ctx,
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chain.HostSelectOption(host),
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chain.ProtocolSelectOption(protocol),
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)
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}
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if target == nil {
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err := errors.New("target not available")
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log.Error(err)
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return err
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}
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log = log.WithFields(map[string]any{
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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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cc, err := h.router.Dial(ctx, network, target.Addr)
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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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t := time.Now()
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log.Debugf("%s <-> %s", conn.RemoteAddr(), target.Addr)
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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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}).Debugf("%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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