一个用Python做端口转发的源码示例，python源码,如何用Python做重定

一个用Python做端口转发的源码示例，python源码,如何用Python做重定

如何用Python做重定向，一个用Python做端口转发的源码示例（Pyhton Port Forwarding）。需要用到socket、optparse及asyncore方法类库。

用Python做Port Forwarding，首先要理解端口转发的原理：端口转发是，转发一个网络端口从一个网络节点到另一个网络节点的行为；其使一个外部用户，从外部经过一个被激活的NAT路由器到达一个在私有内部IP地址上的某个端口。

一个用Python做端口转发的示例源码如下：（供参考）

import socket,asyncoreclass 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)    def handle_accept(self):        conn, addr = self.accept()        # print '--- Connect --- '        sender(receiver(conn),self.remoteip,self.remoteport)class receiver(asyncore.dispatcher):    def __init__(self,conn):        asyncore.dispatcher.__init__(self,conn)        self.from_remote_buffer=''        self.to_remote_buffer=''        self.sender=None    def handle_connect(self):        pass    def handle_read(self):        read = self.recv(4096)        # print '%04i -->'%len(read)        self.from_remote_buffer += read    def writable(self):        return (len(self.to_remote_buffer) > 0)    def handle_write(self):        sent = self.send(self.to_remote_buffer)        # print '%04i <--'%sent        self.to_remote_buffer = self.to_remote_buffer[sent:]    def handle_close(self):        self.close()        if self.sender:            self.sender.close()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))    def handle_connect(self):        pass  #www.iplaypy.com    def handle_read(self):        read = self.recv(4096)        # print '<-- %04i'%len(read)        self.receiver.to_remote_buffer += read    def writable(self):        return (len(self.receiver.from_remote_buffer) > 0)    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:]    def handle_close(self):        self.close()        self.receiver.close()if __name__=='__main__':    import optparse    parser = optparse.OptionParser()    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()    forwarder(options.local_ip,options.local_port,options.remote_ip,options.remote_port)    asyncore.loop()

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