[libdnet-devel] patch to libdnet to support select/poll on descriptors

[Sam R. <sro...@un...>]

Hi there.

libdnet is pretty handy (as is dpkt). Thanks a bunch.

We're using twisted, so need to drive raw packet sends from the select
loop. This requires the underlying fd. Attached is my patch, I think it
would be useful to others.

Btw, I had a lot of trouble building the python binding. Turns out my
linux distro (ubuntu) has both python 2.4 and python 2.5 installed. This
seemed to cause problems. I manually got a build by making sure
/usr/bin/python (2.5) and associated tools were always used. That was a
bit painful, so I just uninstalled python 2.4, and now can build using
./configure --with-python;make;make install. Anyhow, someone who
understands autoconf+python's setup.py better than I might be able to
make this work out-of-the-box.

Thanks,
Sam


Example usage:
--------------
from twisted.internet import reactor
from twisted.internet.interfaces import IWriteDescriptor
from zope.interface import implements

import dpkt
import dnet

class Me:
    implements(IWriteDescriptor)

    def logPrefix(self):
        return "meLogPrefix"

    def __init__(self):
        pass

    def start(self):
        self.net = dnet.eth("eth0")
        reactor.addWriter(self)
        return self

    def fileno(self):
        return self.net.fileno()

    def doWrite(self):
        print "doWrite"
# Get next from g.
        self.net.send(str(dpkt.ethernet.Ethernet()))
        reactor.removeWriter(self)
        reactor.stop()

    def connectionLost(self, reason):
        print "connectionLost:"+repr(reason)
        reactor.stop()

me = Me().start()

reactor.run()