sing-box/transport/wireguard/server_bind.go

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2022-09-05 16:15:09 +00:00
package wireguard
import (
"io"
"github.com/sagernet/sing/common/buf"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/sagernet/wireguard-go/conn"
2022-09-05 16:15:09 +00:00
)
var _ conn.Bind = (*ServerBind)(nil)
type ServerBind struct {
inbound chan serverPacket
done chan struct{}
writeBack N.PacketWriter
}
func NewServerBind(writeBack N.PacketWriter) *ServerBind {
return &ServerBind{
inbound: make(chan serverPacket, 256),
done: make(chan struct{}),
writeBack: writeBack,
}
}
func (s *ServerBind) Abort() error {
select {
case <-s.done:
return io.ErrClosedPipe
default:
close(s.done)
}
return nil
}
type serverPacket struct {
buffer *buf.Buffer
source M.Socksaddr
}
func (s *ServerBind) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) {
fns = []conn.ReceiveFunc{s.receive}
return
}
func (s *ServerBind) receive(b []byte) (n int, ep conn.Endpoint, err error) {
select {
case packet := <-s.inbound:
defer packet.buffer.Release()
n = copy(b, packet.buffer.Bytes())
ep = Endpoint(packet.source)
return
case <-s.done:
err = io.ErrClosedPipe
return
}
}
func (s *ServerBind) WriteIsThreadUnsafe() {
}
func (s *ServerBind) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
select {
case s.inbound <- serverPacket{
buffer: buffer,
source: destination,
}:
return nil
case <-s.done:
return io.ErrClosedPipe
}
}
func (s *ServerBind) Close() error {
return nil
}
func (s *ServerBind) SetMark(mark uint32) error {
return nil
}
func (s *ServerBind) Send(b []byte, ep conn.Endpoint) error {
return s.writeBack.WritePacket(buf.As(b), M.Socksaddr(ep.(Endpoint)))
}
func (s *ServerBind) ParseEndpoint(addr string) (conn.Endpoint, error) {
destination := M.ParseSocksaddr(addr)
if !destination.IsValid() || destination.Port == 0 {
return nil, E.New("invalid endpoint: ", addr)
}
return Endpoint(destination), nil
}