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detector.go
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detector.go
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package loopback
import (
"errors"
"fmt"
"net/netip"
"github.com/metacubex/mihomo/common/callback"
"github.com/metacubex/mihomo/component/iface"
C "github.com/metacubex/mihomo/constant"
"github.com/puzpuzpuz/xsync/v3"
)
var ErrReject = errors.New("reject loopback connection")
type Detector struct {
connMap *xsync.MapOf[netip.AddrPort, struct{}]
packetConnMap *xsync.MapOf[uint16, struct{}]
}
func NewDetector() *Detector {
return &Detector{
connMap: xsync.NewMapOf[netip.AddrPort, struct{}](),
packetConnMap: xsync.NewMapOf[uint16, struct{}](),
}
}
func (l *Detector) NewConn(conn C.Conn) C.Conn {
metadata := C.Metadata{}
if metadata.SetRemoteAddr(conn.LocalAddr()) != nil {
return conn
}
connAddr := metadata.AddrPort()
if !connAddr.IsValid() {
return conn
}
l.connMap.Store(connAddr, struct{}{})
return callback.NewCloseCallbackConn(conn, func() {
l.connMap.Delete(connAddr)
})
}
func (l *Detector) NewPacketConn(conn C.PacketConn) C.PacketConn {
metadata := C.Metadata{}
if metadata.SetRemoteAddr(conn.LocalAddr()) != nil {
return conn
}
connAddr := metadata.AddrPort()
if !connAddr.IsValid() {
return conn
}
port := connAddr.Port()
l.packetConnMap.Store(port, struct{}{})
return callback.NewCloseCallbackPacketConn(conn, func() {
l.packetConnMap.Delete(port)
})
}
func (l *Detector) CheckConn(metadata *C.Metadata) error {
connAddr := metadata.SourceAddrPort()
if !connAddr.IsValid() {
return nil
}
if _, ok := l.connMap.Load(connAddr); ok {
return fmt.Errorf("%w to: %s", ErrReject, metadata.RemoteAddress())
}
return nil
}
func (l *Detector) CheckPacketConn(metadata *C.Metadata) error {
connAddr := metadata.SourceAddrPort()
if !connAddr.IsValid() {
return nil
}
isLocalIp, err := iface.IsLocalIp(connAddr.Addr())
if err != nil {
return err
}
if !isLocalIp && !connAddr.Addr().IsLoopback() {
return nil
}
if _, ok := l.packetConnMap.Load(connAddr.Port()); ok {
return fmt.Errorf("%w to: %s", ErrReject, metadata.RemoteAddress())
}
return nil
}