本文实例讲述了python实现简单的TCP代理服务器的方法，分享给大家供大家参考。

具体实现代码如下：

# -*- coding: utf-8 -*-

'''

filename:rtcp.py

@desc:

利用python的socket端口转发，用于远程维护

如果连接不到远程，会sleep 36s，最多尝试200(即两小时)

@usage:

./rtcp.py stream1 stream2

stream为：l:port或c:host:port

l:port表示监听指定的本地端口

c:host:port表示监听远程指定的端口

@author: watercloud, zd, knownsec team

@web: www.knownsec.com, blog.knownsec.com

@date: 2009-7

'''

import socket

import sys

import threading

import time

streams = [None, None] # 存放需要进行数据转发的两个数据流(都是SocketObj对象)

debug = 1 # 调试状态 0 or 1

def _usage():

print 'Usage: ./rtcp.py stream1 stream2\nstream : l:port or c:host:port'

def _get_another_stream(num):

'''

从streams获取另外一个流对象，如果当前为空，则等待

'''

if num == 0:

num = 1

elif num == 1:

num = 0

else:

raise "ERROR"

while True:

if streams[num] == 'quit':

print("can't connect to the target, quit now!")

sys.exit(1)

if streams[num] != None:

return streams[num]

else:

time.sleep(1)

def _xstream(num, s1, s2):

'''

交换两个流的数据

num为当前流编号,主要用于调试目的，区分两个回路状态用。

'''

try:

while True:

#注意，recv函数会阻塞，直到对端完全关闭(close后还需要一定时间才能关闭，最快关闭方法是shutdow)

buff = s1.recv(1024)

if debug > 0:

print num,"recv"

if len(buff) == 0: #对端关闭连接，读不到数据

print num,"one closed"

break

s2.sendall(buff)

if debug > 0:

print num,"sendall"

except :

print num,"one connect closed."

try:

s1.shutdown(socket.SHUT_RDWR)

s1.close()

except:

pass

try:

s2.shutdown(socket.SHUT_RDWR)

s2.close()

except:

pass

streams[0] = None

streams[1] = None

print num, "CLOSED"

def _server(port, num):

'''

处理服务情况,num为流编号(第0号还是第1号)

'''

srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

srv.bind(('0.0.0.0', port))

srv.listen(1)

while True:

conn, addr = srv.accept()

print "connected from:", addr

streams[num] = conn # 放入本端流对象

s2 = _get_another_stream(num) # 获取另一端流对象

_xstream(num, conn, s2)

def _connect(host, port, num):

''' 处理连接，num为流编号(第0号还是第1号)

@note: 如果连接不到远程，会sleep 36s，最多尝试200(即两小时)

'''

not_connet_time = 0

wait_time = 36

try_cnt = 199

while True:

if not_connet_time > try_cnt:

streams[num] = 'quit'

print('not connected')

return None

conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

try:

conn.connect((host, port))

except Exception, e:

print ('can not connect %s:%s!' % (host, port))

not_connet_time += 1

time.sleep(wait_time)

continue

print "connected to %s:%i" % (host, port)

streams[num] = conn #放入本端流对象

s2 = _get_another_stream(num) #获取另一端流对象

_xstream(num, conn, s2)

if __name__ == '__main__':

if len(sys.argv) != 3:

_usage()

sys.exit(1)

tlist = [] # 线程列表，最终存放两个线程对象

targv = [sys.argv[1], sys.argv[2] ]

for i in [0, 1]:

s = targv[i] # stream描述 c:ip:port 或 l:port

sl = s.split(':')

if len(sl) == 2 and (sl[0] == 'l' or sl[0] == 'L'): # l:port

t = threading.Thread(target=_server, args=(int(sl[1]), i))

tlist.append(t)

elif len(sl) == 3 and (sl[0] == 'c' or sl[0] == 'C'): # c:host:port

t = threading.Thread(target=_connect, args=(sl[1], int(sl[2]), i))

tlist.append(t)

else:

_usage()

sys.exit(1)

for t in tlist:

t.start()

for t in tlist:

t.join()

sys.exit(0)

完整实例代码点击此处本站下载。

希望本文所述对大家的Python程序设计有所帮助。