Yuan Tong
102 lines
2.8 KiB
Go
102 lines
2.8 KiB
Go
package remote
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import (
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"bytes"
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"context"
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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/hop"
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"github.com/go-gost/core/logger"
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xctx "github.com/go-gost/x/ctx"
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ictx "github.com/go-gost/x/internal/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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mdutil "github.com/go-gost/x/metadata/util"
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xrecorder "github.com/go-gost/x/recorder"
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)
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// handleRawForwarding performs node selection, dials the target through the
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// router, and pipes the raw connection. It is used when sniffing is disabled
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// or the protocol was not HTTP/TLS.
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func (h *forwardHandler) handleRawForwarding(ctx context.Context, conn net.Conn, ro *xrecorder.HandlerRecorderObject, log logger.Logger, network, proto string) error {
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target := h.selectTarget(ctx, proto)
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if target == nil {
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log.Error(errNodeNotAvailable)
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return errNodeNotAvailable
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}
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addr := target.Addr
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if opts := target.Options(); opts != nil {
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if opts.Network != "" {
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network = opts.Network
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}
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}
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if network != "unix" {
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if _, _, err := net.SplitHostPort(addr); err != nil {
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addr += ":0"
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}
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}
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ro.Network = network
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ro.Host = addr
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log = log.WithFields(map[string]any{
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"node": target.Name,
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"dst": addr,
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"network": network,
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})
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log.Debugf("%s >> %s", conn.RemoteAddr(), addr)
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var buf bytes.Buffer
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cc, err := h.options.Router.Dial(ictx.ContextWithBuffer(ctx, &buf), network, 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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if marker := target.Marker(); marker != nil {
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marker.Reset()
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}
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defer cc.Close()
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cc = proxyproto.WrapClientConn(
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h.md.proxyProtocol,
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xctx.SrcAddrFromContext(ctx),
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xctx.DstAddrFromContext(ctx),
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cc)
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log = log.WithFields(map[string]any{"src": cc.LocalAddr().String(), "dst": cc.RemoteAddr().String()})
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ro.SrcAddr = cc.LocalAddr().String()
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ro.DstAddr = cc.RemoteAddr().String()
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t := time.Now()
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log.Infof("%s <-> %s", conn.RemoteAddr(), target.Addr)
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if err := xnet.Pipe(ctx, conn, cc, xnet.WithReadTimeout(h.md.idleTimeout)); err != nil {
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log.Debugf("pipe: %v", err)
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}
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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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// selectTarget picks a forwarding target, preferring the host from context
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// metadata when set, then falling back to hop selection.
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func (h *forwardHandler) selectTarget(ctx context.Context, proto string) *chain.Node {
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if host := mdutil.GetString(ictx.MetadataFromContext(ctx), "host"); host != "" {
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return &chain.Node{Addr: host}
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}
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if curHop := h.getHop(); curHop != nil {
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return curHop.Select(ctx, hop.ProtocolSelectOption(proto))
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}
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return nil
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}
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