ginuerzh
109 lines
2.0 KiB
Go
109 lines
2.0 KiB
Go
package relay
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import (
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"net"
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"github.com/go-gost/gosocks5"
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"github.com/go-gost/relay"
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)
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func StatusText(code uint8) string {
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switch code {
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case relay.StatusBadRequest:
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return "Bad Request"
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case relay.StatusForbidden:
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return "Forbidden"
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case relay.StatusHostUnreachable:
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return "Host Unreachable"
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case relay.StatusInternalServerError:
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return "Internal Server Error"
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case relay.StatusNetworkUnreachable:
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return "Network Unreachable"
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case relay.StatusServiceUnavailable:
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return "Service Unavailable"
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case relay.StatusTimeout:
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return "Timeout"
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case relay.StatusUnauthorized:
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return "Unauthorized"
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default:
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return ""
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}
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}
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type udpTunConn struct {
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net.Conn
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taddr net.Addr
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}
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func UDPTunClientConn(c net.Conn, targetAddr net.Addr) net.Conn {
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return &udpTunConn{
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Conn: c,
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taddr: targetAddr,
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}
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}
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func UDPTunClientPacketConn(c net.Conn) net.PacketConn {
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return &udpTunConn{
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Conn: c,
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}
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}
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func UDPTunServerConn(c net.Conn) net.PacketConn {
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return &udpTunConn{
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Conn: c,
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}
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}
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func (c *udpTunConn) ReadFrom(b []byte) (n int, addr net.Addr, err error) {
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socksAddr := gosocks5.Addr{}
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header := gosocks5.UDPHeader{
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Addr: &socksAddr,
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}
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dgram := gosocks5.UDPDatagram{
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Header: &header,
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Data: b,
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}
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_, err = dgram.ReadFrom(c.Conn)
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if err != nil {
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return
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}
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n = len(dgram.Data)
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if n > len(b) {
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n = copy(b, dgram.Data)
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}
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addr, err = net.ResolveUDPAddr("udp", socksAddr.String())
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return
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}
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func (c *udpTunConn) 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 *udpTunConn) 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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header := gosocks5.UDPHeader{
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Addr: &socksAddr,
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}
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dgram := gosocks5.UDPDatagram{
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Header: &header,
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Data: b,
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}
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dgram.Header.Rsv = uint16(len(dgram.Data))
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dgram.Header.Frag = 0xff // UDP tun relay flag, used by shadowsocks
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_, err = dgram.WriteTo(c.Conn)
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n = len(b)
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return
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}
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func (c *udpTunConn) 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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