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SOCKS Protocol Version 5 Library.

Full TCP/UDP and IPv4/IPv6 support. Goals: KISS, less is more, small API, code is like the original protocol.

❤️ A project by txthinking.com

Install

$ go get github.com/txthinking/socks5

Struct is like concept in protocol

• Negotiation:
  • type NegotiationRequest struct
    • func NewNegotiationRequest(methods []byte), in client
    • func (r *NegotiationRequest) WriteTo(w io.Writer), client writes to server
    • func NewNegotiationRequestFrom(r io.Reader), server reads from client
  • type NegotiationReply struct
    • func NewNegotiationReply(method byte), in server
    • func (r *NegotiationReply) WriteTo(w io.Writer), server writes to client
    • func NewNegotiationReplyFrom(r io.Reader), client reads from server
• User and password negotiation:
  • type UserPassNegotiationRequest struct
    • func NewUserPassNegotiationRequest(username []byte, password []byte), in client
    • func (r *UserPassNegotiationRequest) WriteTo(w io.Writer), client writes to server
    • func NewUserPassNegotiationRequestFrom(r io.Reader), server reads from client
  • type UserPassNegotiationReply struct
    • func NewUserPassNegotiationReply(status byte), in server
    • func (r *UserPassNegotiationReply) WriteTo(w io.Writer), server writes to client
    • func NewUserPassNegotiationReplyFrom(r io.Reader), client reads from server
• Request:
  • type Request struct
    • func NewRequest(cmd byte, atyp byte, dstaddr []byte, dstport []byte), in client
    • func (r *Request) WriteTo(w io.Writer), client writes to server
    • func NewRequestFrom(r io.Reader), server reads from client
    • After server gets the client's *Request, processes...
• Reply:
  • type Reply struct
    • func NewReply(rep byte, atyp byte, bndaddr []byte, bndport []byte), in server
    • func (r *Reply) WriteTo(w io.Writer), server writes to client
    • func NewReplyFrom(r io.Reader), client reads from server
• Datagram:
  • type Datagram struct
    • func NewDatagram(atyp byte, dstaddr []byte, dstport []byte, data []byte)
    • func NewDatagramFromBytes(bb []byte)
    • func (d *Datagram) Bytes()

Advanced API

This can satisfy the classic scenario, and it is still recommended that you choose the above small API to customize for special scenarios.

Server: support both TCP and UDP

• type Server struct
• type Handler interface
  • TCPHandle(*Server, *net.TCPConn, *Request) error
  • UDPHandle(*Server, *net.UDPAddr, *Datagram) error

Example:

server, _ := NewClassicServer(addr, ip, username, password, tcpTimeout, udpTimeout)
server.ListenAndServe(Handler)

Client: support both TCP and UDP and return net.Conn

• type Client struct

Example:

client, _ := socks5.NewClient(server, username, password, tcpTimeout, udpTimeout)
conn, _ := client.Dial(network, addr)

Projects using this library

• Brook: https://github.com/txthinking/brook
• Shiliew: https://www.txthinking.com/shiliew.html
• dismap: https://github.com/zhzyker/dismap
• emp3r0r: https://github.com/jm33-m0/emp3r0r
• hysteria: https://github.com/apernet/hysteria
• mtg: https://github.com/9seconds/mtg
• trojan-go: https://github.com/p4gefau1t/trojan-go

License

Licensed under The MIT License