网上很多python 50行代码实现代理服务器，但是易出现异常，致使退出。
这里的代理服务器，是指2级代理服务器。比如：A可以访问B，B可以访问C，A不能直接访问C。这时候，如果在B开1个2级代理，便可实现A访问C。现有的工具有CCProxy。
这里就是使用Python简单的实现1个2级代理。
#coding=utf⑻
import socket
import select
import sys
import threading
import time
import logging
import os
logsDir = "logs"
if not os.path.isdir(logsDir):
os.mkdir(logsDir)
logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
datefmt='%a, %d %b %Y %H:%M:%S',
filename='logs/logs.log',
filemode='a')
#C的IP和端口
to_addr = ('127.0.0.1', 8087)
maxConnetions = 32
class Proxy:
def __init__(self, addr):
self.proxy = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.proxy.bind(addr)
self.proxy.listen(maxConnetions)
self.inputs = {self.proxy:None}
self.route = {}
def serve_forever(self):
logging.info('proxy listen...')
while 1:
readable, _, _ = select.select(list(self.inputs.keys()), [], [])
for self.sock in readable:
if self.sock == self.proxy:
self.on_join()
else:
try:
data = self.sock.recv(8192)
except Exception, e:
logging.error(str(e))
self.on_quit()
continue
if not data:
self.on_quit()
else:
try:
self.route[self.sock].send(data)
except Exception, e:
logging.error(str(e))
self.on_quit()
continue
def on_join(self):
client, addr = self.proxy.accept()
logging.info("proxy client " + str(addr) + 'connect')
forward = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
forward.connect(to_addr)
except Exception, e:
logging.error(str(e))
client.close()
return
self.inputs [client] = None
self.inputs [forward] = None
self.route[client] = forward
self.route[forward] = client
#删除连接
def on_quit(self):
ls = [self.sock]
if self.sock in self.route:
ls.append(self.route[self.sock])
for s in ls:
if s in self.inputs:
del self.inputs[s]
if s in self.route:
del self.route[s]
s.close()
if __name__ == "__main__":
try:
Proxy(('', 8192)).serve_forever()
except KeyboardInterrupt, e:
logging.error("KeyboardInterrupt" + str(e))