python 实现代理服务器

# encoding:utf-8
import socket
import thread
import re

def getAddr(d):
 a = re.search("Host: (.*)\r\n", d)
 host = a.group(1)
 a = host.split(":")
 if len(a) == 1:
  return (a[0], 80)
 else:
  return (a[0], int(a[1]))

def client(conn, caddr):
    while 1:
        try:
            data = conn.recv(4096)

            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            addr = getAddr(data)
            print "目的服务器：",addr
            s.connect(addr)
            print ‘发给目的服务器数据：‘,data
            s.sendall(data)#将请求数据发给目的服务器
            d = s.recv(40960)#接收目的服务器发过来的数据
            s.close()#断开与目的服务器的连接
            print ‘接收目的服务器数据:‘,d
            conn.sendall(d)#发送给代理的客户端
        except Exception, e:
            print ‘代理的客户端异常：%s, ERROR:%s‘%(caddr,e)
            conn.close()
            break

def serve(PORT = 10086):
 # 创建
 IP = "0.0.0.0"
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.bind((IP, PORT))
 s.listen(10)
 print ‘proxy start...‘
 while True:
  conn, addr = s.accept()
  print ‘conn:‘, conn
  print "addr:", addr
  thread.start_new_thread(client, (conn, addr))

try:
 serve()
except Exception as e:
 print ‘代理服务器异常‘,e

print ‘server end!!!‘