119 lines
2.6 KiB
Go
119 lines
2.6 KiB
Go
package v5
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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/gosocks5"
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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/common/util/socks"
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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("socks5", NewHandler)
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registry.RegisterHandler("socks", NewHandler)
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}
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type socks5Handler struct {
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selector gosocks5.Selector
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bypass bypass.Bypass
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router *chain.Router
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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 &socks5Handler{
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bypass: options.Bypass,
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router: (&chain.Router{}).
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WithLogger(options.Logger).
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WithResolver(options.Resolver),
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logger: options.Logger,
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}
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}
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func (h *socks5Handler) 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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h.selector = &serverSelector{
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Authenticator: h.md.authenticator,
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TLSConfig: h.md.tlsConfig,
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logger: h.logger,
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noTLS: h.md.noTLS,
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}
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h.router.WithRetry(h.md.retryCount)
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return
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}
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// implements chain.Chainable interface
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func (h *socks5Handler) WithChain(chain *chain.Chain) {
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h.router.WithChain(chain)
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}
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func (h *socks5Handler) 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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conn = gosocks5.ServerConn(conn, h.selector)
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req, err := gosocks5.ReadRequest(conn)
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if err != nil {
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h.logger.Error(err)
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return
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}
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h.logger.Debug(req)
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conn.SetReadDeadline(time.Time{})
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address := req.Addr.String()
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switch req.Cmd {
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case gosocks5.CmdConnect:
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h.handleConnect(ctx, conn, "tcp", address)
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case gosocks5.CmdBind:
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h.handleBind(ctx, conn, "tcp", address)
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case socks.CmdMuxBind:
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h.handleMuxBind(ctx, conn, "tcp", address)
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case gosocks5.CmdUdp:
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h.handleUDP(ctx, conn)
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case socks.CmdUDPTun:
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h.handleUDPTun(ctx, conn, "udp", address)
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default:
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h.logger.Errorf("unknown cmd: %d", req.Cmd)
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resp := gosocks5.NewReply(gosocks5.CmdUnsupported, nil)
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resp.Write(conn)
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h.logger.Debug(resp)
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return
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}
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}
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