[Twisted-Python] PcapIO
Neil Blakey-Milner
nbm at mithrandr.moria.org
Sat Dec 21 08:11:07 MST 2002
Hi again,
I'm currently using this PcapIO class in a traffic analyser, and thought
people might find it useful, possibly for inclusion in twisted. It
relies on pylibpcap (http://pylibpcap.sourceforge.net/). If interested,
it's easy enough to use the example code in the pylibpcap distribution
in your protocol's dataReceived.
Neil
--
Neil Blakey-Milner
nbm at mithrandr.moria.org
-------------- next part --------------
#!/usr/local/bin/python
#
# Copyright (c) 2002 Neil Blakey-Milner
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# system imports
import pcap
import sys
# Twisted Imports
from twisted.internet import abstract, protocol
# Sibling Imports
import pcapprotocol
class PcapIO(abstract.FileDescriptor):
def __init__(self, protocol, dev):
"""Create me with a device dev to listen on. Should probably
accept files too, and allow choice of device promiscuity and
snap lengths.
"""
abstract.FileDescriptor.__init__(self)
p = pcap.pcapObject()
p.open_live(dev, 1600, 0, 100)
p.setnonblock(1)
self.fn = p.fileno()
self.pcap = p
self.protocol = protocol
self.protocol.makeConnection(self)
self.startReading()
def fileno(self):
return self.fn
def doRead(self):
try:
output = self.pcap.next()
except IOError, ioe:
if ioe.args[0] == errno.EAGAIN:
return
else:
return CONNECTION_LOST
if not output:
return CONNECTION_LOST
self.protocol.dataReceived(output)
def connectionLost(self, reason):
self.protocol.connectionLost()
More information about the Twisted-Python
mailing list