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【Python】用Python做Port Forwarding

作者:红薯 / 发布于2011/1/10/ 525

import socket,asyncore</div>
<div>class forwarder(asyncore.dispatcher):
 def __init__(self, ip, port, remoteip,remoteport,backlog=5):
 asyncore.dispatcher.__init__(self)
 self.remoteip=remoteip
 self.remoteport=remoteport
 self.create_socket(socket.AF_INET,socket.SOCK_STREAM)
 self.set_reuse_addr()
 self.bind((ip,port))
 self.listen(backlog)</div>
<div> def handle_accept(self):
 conn, addr = self.accept()
 # print '--- Connect --- '
 sender(receiver(conn),self.remoteip,self.remoteport)</div>
<div>class receiver(asyncore.dispatcher):
 def __init__(self,conn):
 asyncore.dispatcher.__init__(self,conn)
 self.from_remote_buffer=''
 self.to_remote_buffer=''
 self.sender=None</div>
<div> def handle_connect(self):
 pass</div>
<div> def handle_read(self):
 read = self.recv(4096)
 # print '%04i -->'%len(read)
 self.from_remote_buffer += read</div>
<div> def writable(self):
 return (len(self.to_remote_buffer) > 0)</div>
<div> def handle_write(self):
 sent = self.send(self.to_remote_buffer)
 # print '%04i <--'%sent
 self.to_remote_buffer = self.to_remote_buffer[sent:]</div>
<div> def handle_close(self):
 self.close()
 if self.sender:
 self.sender.close()</div>
<div>class sender(asyncore.dispatcher):
 def __init__(self, receiver, remoteaddr,remoteport):
 asyncore.dispatcher.__init__(self)
 self.receiver=receiver
 receiver.sender=self
 self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
 self.connect((remoteaddr, remoteport))</div>
<div> def handle_connect(self):
 pass</div>
<div> def handle_read(self):
 read = self.recv(4096)
 # print '<-- %04i'%len(read)
 self.receiver.to_remote_buffer += read</div>
<div> def writable(self):
 return (len(self.receiver.from_remote_buffer) > 0)</div>
<div> def handle_write(self):
 sent = self.send(self.receiver.from_remote_buffer)
 # print '--> %04i'%sent
 self.receiver.from_remote_buffer = self.receiver.from_remote_buffer[sent:]</div>
<div> def handle_close(self):
 self.close()
 self.receiver.close()</div>
if __name__=='__main__':
 import optparse
 parser = optparse.OptionParser()</div>
<div> parser.add_option(
 '-l','--local-ip',
 dest='local_ip',default='127.0.0.1',
 help='Local IP address to bind to')
 parser.add_option(
 '-p','--local-port',
 type='int',dest='local_port',default=80,
 help='Local port to bind to')
 parser.add_option(
 '-r','--remote-ip',dest='remote_ip',
 help='Local IP address to bind to')
 parser.add_option(
 '-P','--remote-port',
 type='int',dest='remote_port',default=80,
 help='Remote port to bind to')
 options, args = parser.parse_args()</div>
<div> forwarder(options.local_ip,options.local_port,options.remote_ip,options.remote_port)
 asyncore.loop()</div>

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