142 lines
3.0 KiB
Go
142 lines
3.0 KiB
Go
package relay
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import (
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"context"
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"net"
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"strconv"
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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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"github.com/go-gost/relay"
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)
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func init() {
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registry.RegisterHandler("relay", NewHandler)
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}
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type relayHandler 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 &relayHandler{
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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 *relayHandler) Init(md md.Metadata) (err error) {
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return h.parseMetadata(md)
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}
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// WithChain implements chain.Chainable interface
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func (h *relayHandler) 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 *relayHandler) Forward(group *chain.NodeGroup) {
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h.group = group
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}
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func (h *relayHandler) 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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if h.md.readTimeout > 0 {
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conn.SetReadDeadline(time.Now().Add(h.md.readTimeout))
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}
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req := relay.Request{}
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if _, err := req.ReadFrom(conn); err != nil {
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h.logger.Error(err)
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return
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}
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conn.SetReadDeadline(time.Time{})
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if req.Version != relay.Version1 {
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h.logger.Error("bad version")
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return
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}
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var user, pass string
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var address string
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for _, f := range req.Features {
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if f.Type() == relay.FeatureUserAuth {
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feature := f.(*relay.UserAuthFeature)
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user, pass = feature.Username, feature.Password
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}
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if f.Type() == relay.FeatureAddr {
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feature := f.(*relay.AddrFeature)
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address = net.JoinHostPort(feature.Host, strconv.Itoa(int(feature.Port)))
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}
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}
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if user != "" {
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h.logger = h.logger.WithFields(map[string]interface{}{"user": user})
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}
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resp := relay.Response{
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Version: relay.Version1,
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Status: relay.StatusOK,
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}
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if h.md.authenticator != nil && !h.md.authenticator.Authenticate(user, pass) {
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resp.Status = relay.StatusUnauthorized
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resp.WriteTo(conn)
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h.logger.Error("unauthorized")
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return
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}
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network := "tcp"
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if (req.Flags & relay.FUDP) == relay.FUDP {
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network = "udp"
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}
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if h.group != nil {
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if address != "" {
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resp.Status = relay.StatusForbidden
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resp.WriteTo(conn)
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h.logger.Error("forbidden")
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return
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}
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// forward mode
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h.handleForward(ctx, conn, network)
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return
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}
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switch req.Flags & relay.CmdMask {
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case relay.CONNECT:
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h.handleConnect(ctx, conn, network, address)
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case relay.BIND:
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h.handleBind(ctx, conn, network, address)
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case relay.ASSOCIATE:
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}
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}
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