将本地端口转发到远程主机

#coding:utf-8
__author__ = 'similarface'
import argparse
import asyncore,socket
LOCAL_SERVER_HOST='localhost'
REMOTE_SERVER_HOST='www.23mofang.com'
BUFSIZE = 4096

class PortForwarder(asyncore.dispatcher):
    def __init__(self,ip,port,remoteip,remoteport,backlog=5):
        '''
        :param ip: IP
        :param port: 端口
        :param remoteip:远程IP
        :param remoteport: 远程端口
        :param backlog: 等待连接队列的最大长度。
        :return:
        '''
        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("连接到：",addr)
        Sender(Receiver(conn),self.remoteip,self.remoteport)

class Receiver(asyncore.dispatcher):
    '''接收类处理传入的客户端请求'''
    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(BUFSIZE)
           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)
           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):
    '''发送类接收 接收类并处理向客户发送数据'''
    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
    def handle_read(self):
        read = self.recv(BUFSIZE)
        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)
        self.receiver.from_remote_buffer = self.receiver.from_remote_buffer[sent:]
    def handle_close(self):
        self.close()
        self.receiver.close()
if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Port forwarding example')
    parser.add_argument('--local-host', action="store", dest="local_host", default=LOCAL_SERVER_HOST)
    parser.add_argument('--local-port', action="store", dest="local_port", type=int, required=True)
    parser.add_argument('--remote-host', action="store", dest="remote_host",  default=REMOTE_SERVER_HOST)
    parser.add_argument('--remote-port', action="store", dest="remote_port", type=int, default=80)
    given_args = parser.parse_args()
    local_host, remote_host = given_args.local_host, given_args.remote_host
    local_port, remote_port = given_args.local_port, given_args.remote_port
    print "Starting port forwarding local %s:%s => remote %s:%s" %(local_host, local_port, remote_host, remote_port)
    PortForwarder(local_host, local_port, remote_host, remote_port)
    asyncore.loop()