90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
package outbound
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/Dreamacro/clash/common/cache"
|
|
"github.com/Dreamacro/clash/component/dialer"
|
|
C "github.com/Dreamacro/clash/constant"
|
|
)
|
|
|
|
const (
|
|
rejectCountLimit = 50
|
|
rejectDelay = time.Second * 35
|
|
)
|
|
|
|
var rejectCounter = cache.NewLRUCache[string, int](cache.WithAge[string, int](15), cache.WithStale[string, int](false), cache.WithSize[string, int](512))
|
|
|
|
type Reject struct {
|
|
*Base
|
|
}
|
|
|
|
// DialContext implements C.ProxyAdapter
|
|
func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) {
|
|
key := metadata.RemoteAddress()
|
|
|
|
count, existed := rejectCounter.Get(key)
|
|
if !existed {
|
|
count = 0
|
|
}
|
|
|
|
count = count + 1
|
|
|
|
rejectCounter.Set(key, count)
|
|
|
|
if count > rejectCountLimit {
|
|
c, _ := net.Pipe()
|
|
|
|
_ = c.SetDeadline(time.Now().Add(rejectDelay))
|
|
|
|
return NewConn(c, r), nil
|
|
}
|
|
|
|
return NewConn(&nopConn{}, r), nil
|
|
}
|
|
|
|
// ListenPacketContext implements C.ProxyAdapter
|
|
func (r *Reject) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) {
|
|
return NewPacketConn(&nopPacketConn{}, r), nil
|
|
}
|
|
|
|
func NewReject() *Reject {
|
|
return &Reject{
|
|
Base: &Base{
|
|
name: "REJECT",
|
|
tp: C.Reject,
|
|
udp: true,
|
|
},
|
|
}
|
|
}
|
|
|
|
type nopConn struct{}
|
|
|
|
func (rw *nopConn) Read(b []byte) (int, error) {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
func (rw *nopConn) Write(b []byte) (int, error) {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
func (rw *nopConn) Close() error { return nil }
|
|
func (rw *nopConn) LocalAddr() net.Addr { return nil }
|
|
func (rw *nopConn) RemoteAddr() net.Addr { return nil }
|
|
func (rw *nopConn) SetDeadline(time.Time) error { return nil }
|
|
func (rw *nopConn) SetReadDeadline(time.Time) error { return nil }
|
|
func (rw *nopConn) SetWriteDeadline(time.Time) error { return nil }
|
|
|
|
type nopPacketConn struct{}
|
|
|
|
func (npc *nopPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) { return len(b), nil }
|
|
func (npc *nopPacketConn) ReadFrom(b []byte) (int, net.Addr, error) { return 0, nil, io.EOF }
|
|
func (npc *nopPacketConn) Close() error { return nil }
|
|
func (npc *nopPacketConn) LocalAddr() net.Addr { return &net.UDPAddr{IP: net.IPv4zero, Port: 0} }
|
|
func (npc *nopPacketConn) SetDeadline(time.Time) error { return nil }
|
|
func (npc *nopPacketConn) SetReadDeadline(time.Time) error { return nil }
|
|
func (npc *nopPacketConn) SetWriteDeadline(time.Time) error { return nil }
|