57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
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package socks5
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import (
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"bytes"
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"log"
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"net"
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)
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// UDP remote conn which u want to connect with your dialer.
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// Error or OK both replied.
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// Addr can be used to associate TCP connection with the coming UDP connection.
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func (r *Request) UDP(c *net.TCPConn, serverAddr *net.UDPAddr) (*net.UDPAddr, error) {
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var clientAddr *net.UDPAddr
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var err error
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if bytes.Compare(r.DstPort, []byte{0x00, 0x00}) == 0 {
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// If the requested Host/Port is all zeros, the relay should simply use the Host/Port that sent the request.
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// https://stackoverflow.com/questions/62283351/how-to-use-socks-5-proxy-with-tidudpclient-properly
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clientAddr, err = net.ResolveUDPAddr("udp", c.RemoteAddr().String())
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} else {
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clientAddr, err = net.ResolveUDPAddr("udp", r.Address())
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}
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if err != nil {
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var p *Reply
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if r.Atyp == ATYPIPv4 || r.Atyp == ATYPDomain {
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p = NewReply(RepHostUnreachable, ATYPIPv4, []byte{0x00, 0x00, 0x00, 0x00}, []byte{0x00, 0x00})
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} else {
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p = NewReply(RepHostUnreachable, ATYPIPv6, []byte(net.IPv6zero), []byte{0x00, 0x00})
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}
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if _, err := p.WriteTo(c); err != nil {
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return nil, err
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}
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return nil, err
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}
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if Debug {
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log.Println("Client wants to start UDP talk use", clientAddr.String())
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}
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a, addr, port, err := ParseAddress(serverAddr.String())
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if err != nil {
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var p *Reply
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if r.Atyp == ATYPIPv4 || r.Atyp == ATYPDomain {
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p = NewReply(RepHostUnreachable, ATYPIPv4, []byte{0x00, 0x00, 0x00, 0x00}, []byte{0x00, 0x00})
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} else {
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p = NewReply(RepHostUnreachable, ATYPIPv6, []byte(net.IPv6zero), []byte{0x00, 0x00})
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}
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if _, err := p.WriteTo(c); err != nil {
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return nil, err
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}
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return nil, err
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}
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p := NewReply(RepSuccess, a, addr, port)
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if _, err := p.WriteTo(c); err != nil {
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return nil, err
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}
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return clientAddr, nil
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}
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