本文实例讲述了Python实现简单的代理服务器。分享给大家供大家参考。具体如下：

具备简单的管理功能，运行后 telnet localhost 9000 端口可以进行管理主要功能就是做包转发，如果有一个桥服务器，可以用来外网访问内网用，还是很管用的

#/bin/env python #coding:utf-8 import socket,select,sys,time import thread s_list = [] def loop(cs,addr,s_ip,s_port): print '%s %d connected.' % addr ts = socket.socket() try: ts.connect((s_ip,s_port)) except: cs.close() print '%s %d closed.' % addr sys.exit(0) while True: rl,wl,xl = select.select([cs.fileno(),ts.fileno()],[],[cs.fileno(),ts.fileno()]) if len(xl) > 0: cs.close() ts.close() print '%s %d closed.' % addr sys.exit(0) if len(rl) > 0: if rl[0] == cs.fileno(): rs = ts ws = cs else: rs = cs ws = ts try: buffer = ws.recv(10000) if len(buffer) == 0: raise rs.send(buffer) except: rs.close() ts.close() print '%s %d closed.' % addr sys.exit(0) def mainserver(l_port,s_ip,s_port): global s_list try: ss = socket.socket() ss.bind(('0.0.0.0',l_port)) ss.listen(10) s_list.append((l_port,s_ip,s_port)) except: sys.exit(0) while True: cs,addr = ss.accept() thread.start_new_thread(loop,(cs,addr,s_ip,s_port)) def manager(l_port): global start,s_list ss = socket.socket() ss.bind(('0.0.0.0',l_port)) ss.listen(10) while True: cs,addr = ss.accept() cs.send("""trans server 1.0\r\ntype 'help' to get help\r\n""") buffer = '' while True: buf = cs.recv(10000) if len(buf) == 0: cs.close() break if buf[-1] not in ('\r','\n'): buffer += buf continue buffer += buf cmd = buffer.strip() buffer = '' if cmd == 'exit': cs.close() break elif cmd == 'stop': start = 0 cs.close() sys.exit(0) elif cmd == 'list': b = '' for l in s_list: b += '%4d %s:%d\r\n' % l if len(b) > 0: cs.send(b) elif cmd in ('help','?'): cs.send("""-------------------------------------------\rexit\r exit telnet\r start localport serverip:serverport\r start a new server\r list\r list all server\r -------------------------------------------\r """) else: cmds = cmd.split(" ",1) if len(cmds) > 1 and cmds[0] == 'start': args = cmds[1].strip().split(" ",1) if len(args) != 2: cs.send('start localport serverip:serverport\r\n') continue arg = args[1].split(":",1) if len(arg) != 2: cs.send('start localport serverip:serverport\r\n') continue try: l_port = int(args[0]) s_ip = arg[0] s_port = int(arg[1]) except: cs.send('start localport serverip:serverport\r\n') continue thread.start_new_thread(mainserver,(l_port,s_ip,s_port)) cs.send('start OK!\r\n') else: cs.send('no command [%s]\r\n' % cmd) continue def main(): global start if len(sys.argv) == 3: try: l_port = int(sys.argv[1]) s_ip,s_port = sys.argv[2].split(":") s_port = int(s_port) thread.start_new_thread(mainserver,(l_port,s_ip,s_port)) except: pass start = 1 thread.start_new_thread(manager,(9000,)) while start: time.sleep(1) if __name__ == '__main__': start = 0 main()

希望本文所述对大家的Python程序设计有所帮助。