[Python-Twisted] Twisted入门之端口转发服务器 .

Twisted 是Python界很有名的一个基于异步事件的网络I/O框架，性能棒棒的，经历过BT的考验。本人垂涎很久了，于是写了一个端口转发服务器，纯练手~~~

 

需求：将windows的远程桌面做一个端口转发。

即：有三台机器分别为A B C.在C上打开远程桌面服务，开启3389端口。

      在B上运行端口转发程序，将发往B的1099端口的数据发送到C的3389.

     这样在A上通过远程桌面客户端访问B的1099端口就可以远程访问C的机器。

Understand?

let's go !!

Code  ：

from twisted.internet.protocol import Protocol,ClientCreator

from twisted.internet import reactor
from twisted.protocols.basic import LineReceiver
from twisted.internet.protocol import Factory,ClientFactory
class Transfer(Protocol):
        def __init__(self):
                pass
        def connectionMade(self):
                c = ClientCreator(reactor,Clienttransfer)
                c.connectTCP("10.61.1.243",3389).addCallback(self.set_protocol)
                self.transport.pauseProducing()

        def set_protocol(self,p):
                self.server = p
                p.set_protocol(self)

        def dataReceived(self,data):
                self.server.transport.write(data)

        def connectionLost(self,reason):
                self.transport.loseConnection()
                self.server.transport.loseConnection()

class Clienttransfer(Protocol):
        def __init__(self):
                pass

        def set_protocol(self,p):
                self.server = p
                self.server.transport.resumeProducing()
                pass
        def dataReceived(self,data):
                self.server.transport.write(data)
                pass

factory = Factory()
factory.protocol = Transfer
reactor.listenTCP(1099,factory)
reactor.run()
写得比较仓促红色代码为转发的目的地址以及端口。

小测试了下。呵呵还行 远程桌面使用正常。我这个的实现比较恶，毫无构架扩展性而言,慢慢来 呵呵。

这个程序挺适合入门练手的，包括了服务端和客户端的写法，其中注意绿色标记的地方，我刚开始没有注意这个，

导致 self.server.transport.write(data)中的server未初始化就开始写数据。

o~了。。

写完后看了看twisted的源码，发现在twisted.protocols.base 下有一个portforword.py。

贴出来：
# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
# See LICENSE for details.

"""
A simple port forwarder.
"""

# Twisted imports
from twisted.internet import protocol
from twisted.python import log

class Proxy(protocol.Protocol):
    noisy = True

    peer = None

    def setPeer(self, peer):
        self.peer = peer

    def connectionLost(self, reason):
        if self.peer is not None:
            self.peer.transport.loseConnection()
            self.peer = None
        elif self.noisy:
            log.msg("Unable to connect to peer: %s" % (reason,))

    def dataReceived(self, data):
        self.peer.transport.write(data)

class ProxyClient(Proxy):
    def connectionMade(self):
        self.peer.setPeer(self)
        # We're connected, everybody can read to their hearts content.
        self.peer.transport.resumeProducing()

class ProxyClientFactory(protocol.ClientFactory):

    protocol = ProxyClient

    def setServer(self, server):
        self.server = server

    def buildProtocol(self, *args, **kw):
        prot = protocol.ClientFactory.buildProtocol(self, *args, **kw)
        prot.setPeer(self.server)
        return prot

    def clientConnectionFailed(self, connector, reason):
        self.server.transport.loseConnection()

class ProxyServer(Proxy):

    clientProtocolFactory = ProxyClientFactory

    def connectionMade(self):
        # Don't read anything from the connecting client until we have
        # somewhere to send it to.
        self.transport.pauseProducing()

        client = self.clientProtocolFactory()
        client.setServer(self)

        from twisted.internet import reactor
        reactor.connectTCP(self.factory.host, self.factory.port, client)

class ProxyFactory(protocol.Factory):
    """Factory for port forwarder."""

    protocol = ProxyServer

    def __init__(self, host, port):
        self.host = host
        self.port = port

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