173 lines
3.6 KiB
Go
173 lines
3.6 KiB
Go
package v5
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import (
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"context"
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"errors"
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"net"
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"time"
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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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ctxvalue "github.com/go-gost/x/ctx"
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"github.com/go-gost/x/internal/util/socks"
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stats_util "github.com/go-gost/x/internal/util/stats"
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"github.com/go-gost/x/registry"
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)
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var (
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ErrUnknownCmd = errors.New("socks5: unknown command")
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)
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func init() {
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registry.HandlerRegistry().Register("socks5", NewHandler)
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registry.HandlerRegistry().Register("socks", NewHandler)
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}
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type socks5Handler struct {
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selector gosocks5.Selector
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md metadata
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options handler.Options
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stats *stats_util.HandlerStats
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cancel context.CancelFunc
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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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options: options,
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stats: stats_util.NewHandlerStats(options.Service),
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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.options.Auther,
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TLSConfig: h.options.TLSConfig,
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logger: h.options.Logger,
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noTLS: h.md.noTLS,
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}
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ctx, cancel := context.WithCancel(context.Background())
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h.cancel = cancel
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if h.options.Observer != nil {
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go h.observeStats(ctx)
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}
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return
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}
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func (h *socks5Handler) 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.md.readTimeout > 0 {
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conn.SetReadDeadline(time.Now().Add(h.md.readTimeout))
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}
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sc := gosocks5.ServerConn(conn, h.selector)
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req, err := gosocks5.ReadRequest(sc)
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if err != nil {
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log.Error(err)
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return err
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}
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log.Trace(req)
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if clientID := sc.ID(); clientID != "" {
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ctx = ctxvalue.ContextWithClientID(ctx, ctxvalue.ClientID(clientID))
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log = log.WithFields(map[string]any{"user": clientID})
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}
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conn = sc
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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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return h.handleConnect(ctx, conn, "tcp", address, log)
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case gosocks5.CmdBind:
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return h.handleBind(ctx, conn, "tcp", address, log)
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case socks.CmdMuxBind:
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return h.handleMuxBind(ctx, conn, "tcp", address, log)
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case gosocks5.CmdUdp:
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return h.handleUDP(ctx, conn, log)
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case socks.CmdUDPTun:
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return h.handleUDPTun(ctx, conn, "udp", address, log)
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default:
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err = ErrUnknownCmd
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log.Error(err)
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resp := gosocks5.NewReply(gosocks5.CmdUnsupported, nil)
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log.Trace(resp)
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resp.Write(conn)
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return err
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}
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}
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func (h *socks5Handler) Close() error {
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if h.cancel != nil {
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h.cancel()
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}
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return nil
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}
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func (h *socks5Handler) 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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func (h *socks5Handler) observeStats(ctx context.Context) {
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if h.options.Observer == nil {
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return
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}
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d := h.md.observePeriod
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if d < time.Millisecond {
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d = 5 * time.Second
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}
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ticker := time.NewTicker(d)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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h.options.Observer.Observe(ctx, h.stats.Events())
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case <-ctx.Done():
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return
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}
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}
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}
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