74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package packet
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import (
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"net"
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"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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N "github.com/sagernet/sing/common/network"
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)
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type SingPacketConn = N.NetPacketConn
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type enhanceSingPacketConn struct {
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N.NetPacketConn
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readWaiter N.PacketReadWaiter
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}
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func (c *enhanceSingPacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
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var buff *buf.Buffer
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var dest M.Socksaddr
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newBuffer := func() *buf.Buffer {
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buff = buf.NewPacket() // do not use stack buffer
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return buff
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}
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if c.readWaiter != nil {
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c.readWaiter.InitializeReadWaiter(newBuffer)
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defer c.readWaiter.InitializeReadWaiter(nil)
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dest, err = c.readWaiter.WaitReadPacket()
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} else {
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dest, err = c.NetPacketConn.ReadPacket(newBuffer())
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}
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if dest.IsFqdn() {
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addr = dest
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} else {
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addr = dest.UDPAddr()
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}
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if err != nil {
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if buff != nil {
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buff.Release()
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}
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return
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}
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if buff == nil {
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return
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}
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if buff.IsEmpty() {
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buff.Release()
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return
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}
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data = buff.Bytes()
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put = buff.Release
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return
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}
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func (c *enhanceSingPacketConn) Upstream() any {
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return c.NetPacketConn
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}
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func (c *enhanceSingPacketConn) WriterReplaceable() bool {
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return true
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}
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func (c *enhanceSingPacketConn) ReaderReplaceable() bool {
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return true
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}
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func newEnhanceSingPacketConn(conn N.NetPacketConn) *enhanceSingPacketConn {
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epc := &enhanceSingPacketConn{NetPacketConn: conn}
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if readWaiter, isReadWaiter := bufio.CreatePacketReadWaiter(conn); isReadWaiter {
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epc.readWaiter = readWaiter
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}
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return epc
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}
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