146 lines
3.1 KiB
Go
146 lines
3.1 KiB
Go
package v4
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import (
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"context"
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"net"
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"time"
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"github.com/go-gost/gosocks4"
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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.HandlerRegistry().Register("socks4", NewHandler)
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registry.HandlerRegistry().Register("socks4a", NewHandler)
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}
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type socks4Handler struct {
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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 &socks4Handler{
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options: options,
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}
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}
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func (h *socks4Handler) Init(md md.Metadata) (err error) {
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if err := h.parseMetadata(md); err != nil {
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return err
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}
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h.router = &chain.Router{
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Retries: h.options.Retries,
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Chain: h.options.Chain,
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Resolver: h.options.Resolver,
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Hosts: h.options.Hosts,
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Logger: h.options.Logger,
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}
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return nil
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}
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func (h *socks4Handler) 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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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.md.readTimeout > 0 {
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conn.SetReadDeadline(time.Now().Add(h.md.readTimeout))
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}
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req, err := gosocks4.ReadRequest(conn)
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if err != nil {
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log.Error(err)
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return
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}
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log.Debug(req)
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conn.SetReadDeadline(time.Time{})
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if h.options.Auther != nil &&
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!h.options.Auther.Authenticate(string(req.Userid), "") {
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resp := gosocks4.NewReply(gosocks4.RejectedUserid, nil)
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resp.Write(conn)
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log.Debug(resp)
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return
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}
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switch req.Cmd {
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case gosocks4.CmdConnect:
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h.handleConnect(ctx, conn, req, log)
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case gosocks4.CmdBind:
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h.handleBind(ctx, conn, req)
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default:
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log.Errorf("unknown cmd: %d", req.Cmd)
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}
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}
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func (h *socks4Handler) handleConnect(ctx context.Context, conn net.Conn, req *gosocks4.Request, log logger.Logger) {
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addr := req.Addr.String()
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log = log.WithFields(map[string]any{
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"dst": addr,
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})
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log.Infof("%s >> %s", conn.RemoteAddr(), addr)
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if h.options.Bypass != nil && h.options.Bypass.Contains(addr) {
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resp := gosocks4.NewReply(gosocks4.Rejected, nil)
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resp.Write(conn)
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log.Debug(resp)
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log.Info("bypass: ", addr)
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return
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}
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cc, err := h.router.Dial(ctx, "tcp", addr)
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if err != nil {
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resp := gosocks4.NewReply(gosocks4.Failed, nil)
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resp.Write(conn)
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log.Debug(resp)
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return
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}
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defer cc.Close()
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resp := gosocks4.NewReply(gosocks4.Granted, nil)
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if err := resp.Write(conn); err != nil {
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log.Error(err)
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return
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}
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log.Debug(resp)
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t := time.Now()
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log.Infof("%s <-> %s", conn.RemoteAddr(), addr)
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handler.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(), addr)
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}
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func (h *socks4Handler) handleBind(ctx context.Context, conn net.Conn, req *gosocks4.Request) {
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// TODO: bind
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}
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