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83 lines
1.9 KiB
83 lines
1.9 KiB
package singbridge
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import (
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"context"
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B "github.com/sagernet/sing/common/buf"
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"github.com/sagernet/sing/common/bufio"
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M "github.com/sagernet/sing/common/metadata"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/transport"
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)
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func CopyPacketConn(ctx context.Context, inboundConn net.Conn, link *transport.Link, destination net.Destination, serverConn net.PacketConn) error {
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conn := &PacketConnWrapper{
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Reader: link.Reader,
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Writer: link.Writer,
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Dest: destination,
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Conn: inboundConn,
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}
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return ReturnError(bufio.CopyPacketConn(ctx, conn, bufio.NewPacketConn(serverConn)))
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}
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type PacketConnWrapper struct {
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buf.Reader
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buf.Writer
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net.Conn
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Dest net.Destination
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cached buf.MultiBuffer
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}
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func (w *PacketConnWrapper) ReadPacket(buffer *B.Buffer) (M.Socksaddr, error) {
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if w.cached != nil {
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mb, bb := buf.SplitFirst(w.cached)
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if bb == nil {
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w.cached = nil
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} else {
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buffer.Write(bb.Bytes())
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w.cached = mb
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var destination net.Destination
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if bb.UDP != nil {
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destination = *bb.UDP
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} else {
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destination = w.Dest
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}
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bb.Release()
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return ToSocksaddr(destination), nil
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}
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}
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mb, err := w.ReadMultiBuffer()
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if err != nil {
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return M.Socksaddr{}, err
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}
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nb, bb := buf.SplitFirst(mb)
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if bb == nil {
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return M.Socksaddr{}, nil
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} else {
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buffer.Write(bb.Bytes())
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w.cached = nb
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var destination net.Destination
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if bb.UDP != nil {
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destination = *bb.UDP
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} else {
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destination = w.Dest
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}
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bb.Release()
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return ToSocksaddr(destination), nil
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}
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}
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func (w *PacketConnWrapper) WritePacket(buffer *B.Buffer, destination M.Socksaddr) error {
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vBuf := buf.New()
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vBuf.Write(buffer.Bytes())
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endpoint := ToDestination(destination, net.Network_UDP)
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vBuf.UDP = &endpoint
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return w.Writer.WriteMultiBuffer(buf.MultiBuffer{vBuf})
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}
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func (w *PacketConnWrapper) Close() error {
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buf.ReleaseMulti(w.cached)
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return nil
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}
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