Packet Construction and Protocol Testing...

[Andrew R. Reiter]

Aren't there already tools for doing this -- libnet / libdnet that both 
have py wrappers?

On Thu, 20 Jul 2006, gnn at freebsd.org wrote:

:Hi,
:
:Sorry for the length of this email but I figured I'd get this out
:early in case there was anyone else who wanted to play with this.
:
:I have now gotten out version 0.1 of the Packet Construction Set.
:This is a set of Python libraries which make writing protocol testing
:software much easier.  Of course, you have to know Python, but many
:people do, and I favor it strongly over other scripting choices.  The
:Summer of Code student I'm working with has also been using this
:library, with favorable results.
:
:The Source Forge page is here:
:
:http://sourceforge.net/projects/pcs
:
:and the shar files submitted to get the ports created are now on:
:
:http://www.freebsd.org/~gnn/pcs.port.shar
:http://www.freebsd.org/~gnn/py-pypcap.shar
:
:The point of all this is to be able to write better protocol level
:tests for our network stack.  Examples are in the scripts/ and tests/
:directories of the package but a quick snippet may give a good idea of
:what I'm getting at:
:
:    def test_icmpv4_ping(self):
:        ip = ipv4()
:        ip.version = 4
:        ip.hlen = 5
:        ip.tos = 0
:        ip.length = 84
:        ip.id = 1
:        ip.flags = 0
:        ip.offset = 0
:        ip.ttl = 33
:        ip.protocol = IPPROTO_ICMP
:        ip.src = 2130706433
:        ip.dst = 2130706433
:
:        icmp = icmpv4()
:        icmp.type = 8
:        icmp.code = 0
:        icmp.cksum = 0
:        
:        echo = icmpv4echo()
:        echo.id = 32767
:        echo.seq = 1
:
:        lo = localhost()
:        lo.type = 2
:        packet = Chain([lo, ip, icmp, echo])
:        
:        input = PcapConnector("lo0")
:        input.setfilter("icmp")
:
:        output = PcapConnector("lo0")
:        assert (ip != None)
:
:        out = output.write(packet.bytes, 88)
:        assert (out == 88)
:
:This code sends a quick and dirty, ICMPv4 ping packet on localhost.
:The point of all this is to be able to specify packets easly (see
:pcs/packets/xxx.py) and then to treat the packet as an object.
:
:I intend to write up a paper on this stuff as well.  There is
:currently a simple manual (PDF and LaTeX) in the package.
:
:Later,
:George
:
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:
:

--
arr at watson.org