123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package forward
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import (
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"context"
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"fmt"
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"net"
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"time"
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"github.com/go-gost/gost/pkg/bypass"
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"github.com/go-gost/gost/pkg/chain"
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"github.com/go-gost/gost/pkg/handler"
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"github.com/go-gost/gost/pkg/logger"
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md "github.com/go-gost/gost/pkg/metadata"
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"github.com/go-gost/gost/pkg/registry"
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)
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func init() {
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registry.RegisterHandler("tcp", NewHandler)
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registry.RegisterHandler("udp", NewHandler)
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registry.RegisterHandler("forward", NewHandler)
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}
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type forwardHandler struct {
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group *chain.NodeGroup
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chain *chain.Chain
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bypass bypass.Bypass
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logger logger.Logger
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md metadata
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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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bypass: options.Bypass,
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logger: options.Logger,
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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.group == nil {
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// dummy node used by relay connector.
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h.group = chain.NewNodeGroup(chain.NewNode("dummy", ":0"))
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}
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return nil
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}
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// WithChain implements chain.Chainable interface
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func (h *forwardHandler) WithChain(chain *chain.Chain) {
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h.chain = chain
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}
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// Forward implements handler.Forwarder.
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func (h *forwardHandler) Forward(group *chain.NodeGroup) {
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h.group = group
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}
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func (h *forwardHandler) Handle(ctx context.Context, conn net.Conn) {
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defer conn.Close()
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start := time.Now()
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h.logger = h.logger.WithFields(map[string]interface{}{
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"remote": conn.RemoteAddr().String(),
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"local": conn.LocalAddr().String(),
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})
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h.logger.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
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defer func() {
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h.logger.WithFields(map[string]interface{}{
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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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target := h.group.Next()
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if target == nil {
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h.logger.Error("no target available")
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return
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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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h.logger = h.logger.WithFields(map[string]interface{}{
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"dst": fmt.Sprintf("%s/%s", target.Addr(), network),
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})
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h.logger.Infof("%s >> %s", conn.RemoteAddr(), target.Addr())
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r := (&chain.Router{}).
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WithChain(h.chain).
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WithRetry(h.md.retryCount).
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WithLogger(h.logger)
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cc, err := r.Dial(ctx, network, target.Addr())
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if err != nil {
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h.logger.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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target.Marker().Mark()
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return
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}
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defer cc.Close()
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target.Marker().Reset()
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t := time.Now()
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h.logger.Infof("%s <-> %s", conn.RemoteAddr(), target.Addr())
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handler.Transport(conn, cc)
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h.logger.
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WithFields(map[string]interface{}{
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"duration": time.Since(t),
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}).
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Infof("%s >-< %s", conn.RemoteAddr(), target.Addr())
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}
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