Re: [Twisted-Python] twisted irc client + packet capturing

8 Nov 2013

      On 08:50 am, ewong@pw-wspx.org wrote:
...
Hi,
I've created a script that would log on to an irc server, while
capturing packets.
I came across the following link:
http://dound.com/2009/09/integrating-twisted-with-a-pcap-based-python- 
packet-sniffer/
But I'm using pycap (http://pycap.sourceforge.net/), but I'm having
some difficulties with getting it to work.
Here's the code:
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
# twisted imports
from twisted.words.protocols import irc
from twisted.internet import reactor, protocol
from twisted.python import log
from twisted.internet.defer import Deferred
# system imports
import time, sys
import pycap.capture
def run_pcap(f):
    p = pycap.capture.capture('eth0')
    p.filter('src host ! 192.168.1.100 and dst host ! 192.168.1.100 and 
dst port 25')
    packet = None
    print "Listening...\n"
    while 1:
       if packet:
          print "Received packet."
          reactor.callFromThread(f, packet)
       else:
          print "no packet\n"
       packet = p.next()
class LogBot(irc.IRCClient):
    """A logging IRC bot."""
nickname = "testbot"
def packetShow(self, packet):
        """ booga """
        msg = "Port 25 hit | From:[%s] To:[%s]" % (packet[1].source, 
packet[1].destination)
        self.msg(self.channel, msg)
def connectionMade(self):
        irc.IRCClient.connectionMade(self)
        print "Setting up callInThread\n"
        reactor.callInThread(run_pcap, self.packetShow)
        print "Finished setting up callInThread\n"
def connectionLost(self, reason):
        irc.IRCClient.connectionLost(self, reason)
# callbacks for events
def signedOn(self):
        """Called when bot has succesfully signed on to server."""
        print "Signing on to %s.\n" % self.factory.channel
        # self.join(self.factory.channel)
        self.sendLine("JOIN %s" % (self.factory.channel,))
def joined(self, channel):
        """This will get called when the bot joins the channel."""
        print "Joining channel %s." % channel
def privmsg(self, user, channel, msg):
        """This will get called when the bot receives a message."""
        user = user.split('!', 1)[0]
# Check to see if they're sending me a private message
        if channel == self.nickname:
            msg = "It isn't nice to whisper!  Play nice with the 
group."
            self.msg(user, msg)
            return
# Otherwise check to see if it is a message directed at me
        if msg.startswith(self.nickname + ":"):
            msg = "%s: I am a log bot" % user
            self.msg(channel, msg)
def action(self, user, channel, msg):
        """This will get called when the bot sees someone do an 
action."""
        user = user.split('!', 1)[0]
# irc callbacks
def irc_NICK(self, prefix, params):
        """Called when an IRC user changes their nickname."""
        old_nick = prefix.split('!')[0]
        new_nick = params[0]
# For fun, override the method that determines how a nickname is 
changed on
    # collisions. The default method appends an underscore.
    def alterCollidedNick(self, nickname):
        """
        Generate an altered version of a nickname that caused a 
collision in an
        effort to create an unused related name for subsequent 
registration.
        """
        return nickname + '^'
class LogBotFactory(protocol.ClientFactory):
    """A factory for LogBots.
A new protocol instance will be created each time we connect to the 
server.
    """
def __init__(self, channel):
        self.channel = channel
def buildProtocol(self, addr):
        p = LogBot()
        p.factory = self
        return p
def clientConnectionLost(self, connector, reason):
        """If we get disconnected, reconnect to server."""
        connector.connect()
def clientConnectionFailed(self, connector, reason):
        print "connection failed:", reason
        reactor.stop()
if __name__ == '__main__':
    # create factory protocol and application
    f = LogBotFactory("#testx")
# connect factory to this host and port
    reactor.connectTCP("192.168.1.170", 6667, f)
# run bot
    reactor.run()
I was told that perhaps I could use twisted.pair,
but I have no idea how to use the module.  The
documentation is lacking and I've only just started
programming in Twisted.
Any help appreciated.
I don't know if Twisted Pair will work better for you but you can find 
the start of some documentation about it in this branch:

  https://twistedmatrix.com/trac/browser/branches/tuntap-pytun-6169-3

Additionally, this branch removes the Twisted Pair dependency on the 
"eunuchs" module which is abandoned and difficult to find.

Jean-Paul

Re: [Twisted-Python] twisted irc client + packet capturing

exarkun＠twistedmatrix.com