128 lines
2.6 KiB
Go
128 lines
2.6 KiB
Go
package ss
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import (
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"context"
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"io"
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"io/ioutil"
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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/handler"
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"github.com/go-gost/gost/pkg/internal/utils"
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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("ss", NewHandler)
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}
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type ssHandler struct {
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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 &ssHandler{
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chain: options.Chain,
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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 *ssHandler) Init(md md.Metadata) (err error) {
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return h.parseMetadata(md)
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}
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func (h *ssHandler) 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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sc := conn
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if h.md.cipher != nil {
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sc = utils.ShadowConn(h.md.cipher.StreamConn(conn), nil)
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}
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if h.md.readTimeout > 0 {
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sc.SetReadDeadline(time.Now().Add(h.md.readTimeout))
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}
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addr := &gosocks5.Addr{}
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_, err := addr.ReadFrom(sc)
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if err != nil {
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h.logger.Error(err)
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h.discard(conn)
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return
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}
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sc.SetReadDeadline(time.Time{})
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h.logger = h.logger.WithFields(map[string]interface{}{
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"dst": addr.String(),
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})
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h.logger.Infof("%s >> %s", conn.RemoteAddr(), addr)
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if h.bypass != nil && h.bypass.Contains(addr.String()) {
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h.logger.Info("bypass: ", addr.String())
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return
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}
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r := (&handler.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, "tcp", addr.String())
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if err != nil {
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return
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}
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defer cc.Close()
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h.logger.Infof("%s <-> %s", conn.RemoteAddr(), addr)
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handler.Transport(sc, cc)
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h.logger.Infof("%s >-< %s", conn.RemoteAddr(), addr)
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}
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func (h *ssHandler) discard(conn net.Conn) {
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io.Copy(ioutil.Discard, conn)
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}
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func (h *ssHandler) parseMetadata(md md.Metadata) (err error) {
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h.md.cipher, err = utils.ShadowCipher(
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md.GetString(method),
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md.GetString(password),
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md.GetString(key),
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)
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if err != nil {
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return
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}
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h.md.readTimeout = md.GetDuration(readTimeout)
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h.md.retryCount = md.GetInt(retryCount)
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return
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}
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