如题，端口映射拟将0.0.0.0的8888端口映射到11111去，使访问11111端口等价于访问8888端口

    1. """
    2. https://www.xuebuyuan.com/3229120.html
    3. Python Proxy Server
    4. # TODO: BUG IN CLOSE @LINE45
    5. """
    6. import socket
    7. import select
    8. import sys
    9. to_addr = ('0.0.0.0', 11111)
    12. class Proxy:
    13.     def __init__(self, addr):
    14.         self.proxy = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    15.         self.proxy.bind(addr)
    16.         self.proxy.listen(10)
    17.         self.inputs = [self.proxy]
    18.         self.route = {}
    20.     def serve_forever(self):
    21.         print('proxy listen...')
    22.         while 1:
    23.             readable, _, _ = select.select(self.inputs, [], [])
    24.             for self.sock in readable:
    25.                 if self.sock == self.proxy:
    26.                     self.on_join()
    27.                 else:
    28.                     data = self.sock.recv(8096)
    29.                     if not data:
    30.                         self.on_quit()
    31.                     else:
    32.                         self.route[self.sock].send(data)
    34.     def on_join(self):
    35.         client, addr = self.proxy.accept()
    36.         print(addr, 'connect')
    37.         forward = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    38.         forward.connect(to_addr)
    39.         self.inputs += [client, forward]
    40.         self.route[client] = forward
    41.         self.route[forward] = client
    43.     def on_quit(self):
    44.         for s in self.sock, self.route[self.sock]:
    45.             self.inputs.remove(s)
    46.             del self.route[s]
    47.             s.close()
    50. if __name__ == '__main__':
    51.     try:
    52.         Proxy(('', 8888)).serve_forever()
    53.     except KeyboardInterrupt:
    54.         sys.exit(1)