ginuerzh
105 lines
1.8 KiB
Go
105 lines
1.8 KiB
Go
package ss
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import (
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"bytes"
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"net"
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"github.com/go-gost/core/common/bufpool"
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"github.com/go-gost/gosocks5"
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)
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const (
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defaultBufferSize = 4096
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)
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var (
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_ net.PacketConn = (*UDPConn)(nil)
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_ net.Conn = (*UDPConn)(nil)
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)
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type UDPConn struct {
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net.PacketConn
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raddr net.Addr
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taddr net.Addr
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bufferSize int
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}
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func UDPClientConn(c net.PacketConn, remoteAddr, targetAddr net.Addr, bufferSize int) *UDPConn {
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if bufferSize <= 0 {
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bufferSize = defaultBufferSize
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}
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return &UDPConn{
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PacketConn: c,
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raddr: remoteAddr,
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taddr: targetAddr,
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bufferSize: bufferSize,
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}
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}
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func UDPServerConn(c net.PacketConn, remoteAddr net.Addr, bufferSize int) *UDPConn {
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if bufferSize <= 0 {
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bufferSize = defaultBufferSize
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}
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return &UDPConn{
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PacketConn: c,
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raddr: remoteAddr,
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bufferSize: bufferSize,
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}
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}
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func (c *UDPConn) ReadFrom(b []byte) (n int, addr net.Addr, err error) {
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buf := bufpool.Get(c.bufferSize)
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defer bufpool.Put(buf)
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n, _, err = c.PacketConn.ReadFrom(buf)
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if err != nil {
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return
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}
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saddr := gosocks5.Addr{}
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addrLen, err := saddr.ReadFrom(bytes.NewReader(buf[:n]))
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if err != nil {
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return
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}
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n = copy(b, buf[addrLen:n])
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addr, err = net.ResolveUDPAddr("udp", saddr.String())
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return
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}
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func (c *UDPConn) Read(b []byte) (n int, err error) {
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n, _, err = c.ReadFrom(b)
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return
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}
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func (c *UDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
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socksAddr := gosocks5.Addr{}
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if err = socksAddr.ParseFrom(addr.String()); err != nil {
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return
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}
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buf := bufpool.Get(c.bufferSize)
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defer bufpool.Put(buf)
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addrLen, err := socksAddr.Encode(buf)
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if err != nil {
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return
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}
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n = copy(buf[addrLen:], b)
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_, err = c.PacketConn.WriteTo(buf[:addrLen+n], c.raddr)
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return
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}
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func (c *UDPConn) Write(b []byte) (n int, err error) {
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return c.WriteTo(b, c.taddr)
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}
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func (c *UDPConn) RemoteAddr() net.Addr {
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return c.raddr
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}
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