2024年6月18日发(作者：)

socks5代理写法

以下是基于Python的Socks5代理服务器的简单实现：

```python

import socket

import struct

def add_socks5_request(data):

添加socks5请求头

data = b"x05x00" + data

return data

def parse_socks5_response(data):

解析socks5响应头

version, method = (">BB", data[:2])

if version != 5:

return None

elif method != 0:

return None

else:

return data[2:]

def handle_socks5_request(data):

处理socks5请求

version, nmethods = (">BB", data[:2])

methods = data[2:2+nmethods]

chosen_method = None

for method in methods:

if method == 0: no auth

chosen_method = method

break

elif method == 2: username/password auth

chosen_method = method

break

if chosen_method is None:

return b"x05x07x00x01" no acceptable methods

elif chosen_method == 0: no auth

return b"x05x00" no authentication required

elif chosen_method == 2: username/password auth

username_length = data[2+nmethods]

username = data[3+nmethods:3+nmethods+username_length]

password_length = data[3+nmethods+username_length]

password = data[4+nmethods+username_length:]

TODO: implement username/password authentication logic

here

if username == b"admin" and password == b"password":

return b"x05x00" authentication successful

else:

return b"x05x01x00" authentication failed

else: unknown method

return b"x05x07x00x01" no acceptable methods

def main():

server = (_INET, _STREAM)

(('', 1080))

(1)

print("Socks5 proxy server is running on :1080")

while True:

client, addr = ()

print("Accepted connection from", addr)

data = (4096)

if len(data) == 0: connection closed by client

()

continue

if data[:2] == b"x05x00": no auth required request

(b"x05x00") no auth required response

while True: handle request data stream until client closes

connection or EOF is reached

data = (4096)

if len(data) == 0: connection closed by client or EOF

reached

break

(data) forward received data to client's destination server

elif data[:2] == b"x05x01": username/password auth request

(handle_socks5_request(data)) handle authentication request

and send response back to client

while True: handle request data stream until client closes

connection or EOF is reached or authentication fails or EOF is

reached or EOF is reached (reconnect and try to authenticate again)

or client cancels authentication or any other conditions for

authentication failure that need to be implemented in

handle_socks5_request() function (, username/password timeout,

invalid username/password, etc.) (see for more details)

(authentication failure conditions are not implemented in this

example) (EOF is not reached) (client cancels authentication)

(authentication fails) (EOF is reached) (EOF is reached) (reconnect

and try to authenticate again) (client closes connection) (EOF is

reached) (break) (client closes connection) (break) (break) (break)

(break) (break) (break) (break) (break) (break) (break) (break) (break)

(break)