mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-22 08:31:30 +00:00
83 lines
2.3 KiB
Go
83 lines
2.3 KiB
Go
package dialer
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import (
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"context"
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"net"
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"github.com/sagernet/sing-box/adapter"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/buf"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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)
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func NewResolvePacketConn(router adapter.Router, strategy C.DomainStrategy, conn net.PacketConn) N.NetPacketConn {
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if udpConn, ok := conn.(*net.UDPConn); ok {
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return &ResolveUDPConn{udpConn, router, strategy}
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} else {
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return &ResolvePacketConn{conn, router, strategy}
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}
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}
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type ResolveUDPConn struct {
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*net.UDPConn
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router adapter.Router
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strategy C.DomainStrategy
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}
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func (w *ResolveUDPConn) ReadPacket(buffer *buf.Buffer) (M.Socksaddr, error) {
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n, addr, err := w.ReadFromUDPAddrPort(buffer.FreeBytes())
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if err != nil {
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return M.Socksaddr{}, err
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}
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buffer.Truncate(n)
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return M.SocksaddrFromNetIP(addr), nil
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}
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func (w *ResolveUDPConn) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
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defer buffer.Release()
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if destination.Family().IsFqdn() {
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addresses, err := w.router.Lookup(context.Background(), destination.Fqdn, w.strategy)
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if err != nil {
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return err
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}
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return common.Error(w.UDPConn.WriteTo(buffer.Bytes(), M.SocksaddrFromAddrPort(addresses[0], destination.Port).UDPAddr()))
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}
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return common.Error(w.UDPConn.WriteToUDP(buffer.Bytes(), destination.UDPAddr()))
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}
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func (w *ResolveUDPConn) Upstream() any {
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return w.UDPConn
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}
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type ResolvePacketConn struct {
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net.PacketConn
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router adapter.Router
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strategy C.DomainStrategy
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}
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func (w *ResolvePacketConn) ReadPacket(buffer *buf.Buffer) (M.Socksaddr, error) {
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_, addr, err := buffer.ReadPacketFrom(w)
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if err != nil {
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return M.Socksaddr{}, err
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}
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return M.SocksaddrFromNet(addr), err
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}
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func (w *ResolvePacketConn) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
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defer buffer.Release()
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if destination.Family().IsFqdn() {
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addresses, err := w.router.Lookup(context.Background(), destination.Fqdn, w.strategy)
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if err != nil {
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return err
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}
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return common.Error(w.WriteTo(buffer.Bytes(), M.SocksaddrFromAddrPort(addresses[0], destination.Port).UDPAddr()))
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}
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return common.Error(w.WriteTo(buffer.Bytes(), destination.UDPAddr()))
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}
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func (w *ResolvePacketConn) Upstream() any {
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return w.PacketConn
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}
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