sing-box/common/conntrack/packet_conn.go
2023-09-20 14:15:00 +08:00

56 lines
980 B
Go

package conntrack
import (
"io"
"net"
"github.com/sagernet/sing/common/bufio"
"github.com/sagernet/sing/common/x/list"
)
type PacketConn struct {
net.PacketConn
element *list.Element[io.Closer]
}
func NewPacketConn(conn net.PacketConn) (net.PacketConn, error) {
connAccess.Lock()
element := openConnection.PushBack(conn)
connAccess.Unlock()
if KillerEnabled {
err := KillerCheck()
if err != nil {
conn.Close()
return nil, err
}
}
return &PacketConn{
PacketConn: conn,
element: element,
}, nil
}
func (c *PacketConn) Close() error {
if c.element.Value != nil {
connAccess.Lock()
if c.element.Value != nil {
openConnection.Remove(c.element)
c.element.Value = nil
}
connAccess.Unlock()
}
return c.PacketConn.Close()
}
func (c *PacketConn) Upstream() any {
return bufio.NewPacketConn(c.PacketConn)
}
func (c *PacketConn) ReaderReplaceable() bool {
return true
}
func (c *PacketConn) WriterReplaceable() bool {
return true
}