141 lines
3.0 KiB
Go
141 lines
3.0 KiB
Go
package ss
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import (
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"context"
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"io"
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"net"
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"time"
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"github.com/go-gost/core/chain"
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"github.com/go-gost/core/handler"
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md "github.com/go-gost/core/metadata"
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"github.com/go-gost/gosocks5"
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netpkg "github.com/go-gost/x/internal/net"
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sx "github.com/go-gost/x/internal/util/selector"
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"github.com/go-gost/x/internal/util/ss"
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"github.com/go-gost/x/registry"
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"github.com/shadowsocks/go-shadowsocks2/core"
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)
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func init() {
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registry.HandlerRegistry().Register("ss", NewHandler)
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}
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type ssHandler struct {
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cipher core.Cipher
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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 &ssHandler{
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options: options,
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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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if err = h.parseMetadata(md); err != nil {
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return
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}
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if h.options.Auth != nil {
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method := h.options.Auth.Username()
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password, _ := h.options.Auth.Password()
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h.cipher, err = ss.ShadowCipher(method, password, h.md.key)
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if err != nil {
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return
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}
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}
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h.router = h.options.Router
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if h.router == nil {
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h.router = chain.NewRouter(chain.LoggerRouterOption(h.options.Logger))
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}
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return
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}
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func (h *ssHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) error {
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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.checkRateLimit(conn.RemoteAddr()) {
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return nil
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}
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if h.cipher != nil {
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conn = ss.ShadowConn(h.cipher.StreamConn(conn), nil)
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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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addr := &gosocks5.Addr{}
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if _, err := addr.ReadFrom(conn); err != nil {
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log.Error(err)
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io.Copy(io.Discard, conn)
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return err
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}
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log = log.WithFields(map[string]any{
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"dst": addr.String(),
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})
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log.Debugf("%s >> %s", conn.RemoteAddr(), addr)
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if h.options.Bypass != nil && h.options.Bypass.Contains(ctx, "tcp", addr.String()) {
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log.Debug("bypass: ", addr.String())
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return nil
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}
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switch h.md.hash {
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case "host":
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ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: addr.String()})
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}
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cc, err := h.router.Dial(ctx, "tcp", addr.String())
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if err != nil {
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return err
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}
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defer cc.Close()
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t := time.Now()
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log.Infof("%s <-> %s", conn.RemoteAddr(), addr)
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netpkg.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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return nil
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}
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func (h *ssHandler) checkRateLimit(addr net.Addr) bool {
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if h.options.RateLimiter == nil {
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return true
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}
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host, _, _ := net.SplitHostPort(addr.String())
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if limiter := h.options.RateLimiter.Limiter(host); limiter != nil {
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return limiter.Allow(1)
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}
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return true
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}
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