概述

本文介绍Python实现端口复用实例如下所示：

#coding=utf-8
import socket
import sys
import select
import threading
host='192.168.99.100'
port=80
class Thread(threading.Thread):
  def __init__(self,buf,sockfd):
    threading.Thread.__init__(self)
    self.buf=buf
    self.sockfd=sockfd
  def run(self):
   if len(self.buf)!=0:
    if 'GET' in self.buf :  #判断是否是浏览器提交的数据如果是则将提交的数据转发至本地环回地址的80端口
     s2=socket.socket(socket.AF_INET,socket.soCK_STREAM)
     s2.connect(('127.0.0.1',80))
     s2.send(self.buf)
     bufer=''
     while 1:
      recv_data=s2.recv(1024)
      bufer+=recv_data
      if len(recv_data)==0:
       break
     print bufer,len(bufer)
     if len(bufer)==0:
      pass     
     self.sockfd.send(bufer)  #将服务器发送的数据发回客户端
     s2.close
     self.sockfd.close
     sys.exit()
    else:
     'ps:connect to ssh' #如果数据不是浏览器提交则将其转发至本地的22端口
     s2=socket.socket(socket.AF_INET,22))
     s2.send(self.buf)
     recv_data=s2.recv(4096)
     conn.send(recv_data)
     self.sockfd.close
     s2.close
s=socket.socket(socket.AF_INET,socket.soCK_STREAM)
s.setsockopt( socket.soL_SOCKET,socket.so_REUSEADDR,1 ) #端口复用的关键点
s.bind((host,port))
s.listen(10)
while 1:
 infds,outfds,errfds=select.select([s,],[],5) #使用select函数进行非阻塞操作
 if len(infds)!=0:
  conn,(addr,port)=s.accept()
  print 'connected by',addr,port
  data=conn.recv(1024)
  t=Thread(data,conn)
  t.start()
s.close
#coding=utf-8
import socket
import sys
import select
import threading
host='192.168.99.100'
port=80
class Thread(threading.Thread):
  def __init__(self,conn)
  t.start()
s.close

例子2

import socket
tcp1 = socket.socket(socket.AF_INET,socket.soCK_STREAM)
tcp2 = socket.socket(socket.AF_INET,socket.soCK_STREAM)
#在绑定前调用setsockopt让套接字允许地址重用
tcp1.setsockopt(socket.soL_SOCKET,socket.so_REUSEPORT,1)
tcp2.setsockopt(socket.soL_SOCKET,1)
 #接下来两个套接字都也可以绑定到同一个端口上
tcp1.bind(('0.0.0.0',12345))
tcp2.bind(('0.0.0.0',12345))
import socket
tcp1 = socket.socket(socket.AF_INET,12345))

例子3

重定向

import socket,os
bufLen = 4*1024
sock1 = socket.socket(socket.AF_INET,socket.soCK_STREAM) 
sock1.bind(('192.168.168.100',8000)) 
sock1.listen(5) 
sock2 = socket.socket(socket.AF_INET,socket.soCK_STREAM) 
sock2.connect(('192.168.168.100',12345)) 
while True:
    connection,address = sock1.accept() 
    buf = connection.recv(bufLen) 
    #print buf      
    sock2.send(buf) 
    connection.send(sock2.recv(bufLen))
    connection.close()
import socket,address = sock1.accept() 
    buf = connection.recv(bufLen) 
    #print buf      
    sock2.send(buf) 
    connection.send(sock2.recv(bufLen))
    connection.close()

总结

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