me, 2.0: jose nazario
beauty and the street
been hacking in tcl again
actually i've been hacking in a few languages. i wrote a milter plugin for
Sendmail which implements a
basic worm
throttle. i contacted williamson about it, i'd like to release it but
before i do i need to make sure its free of patent issues. very easy to
implement, i did it in about one evening (two if you count testing and
debugging).
i spent a good portion of tonight running a simulation i started last
night (i didn't keep my laptop running all night). i wrote some code
(tcl, using tcllib's graph module) to simulate work outbreaks.
above is a graph of the total number of sapphire hosts in a simple 3
node network over 600 time steps. i seeded one affected host in as1 and
then let it go. the network is shown here:
and you can see how many victims there are per network and how easy
it will be to find them.
the code has some bugs right now, and is nowhere near prime time. however,
i'm finally reasonably happy with a first approximation modelling engine
for a simple worm outbreak. bandwidth isn't infinite, for example, and the
network space isn't flat. the real challenge is going to be making it
more general purpose, for other people and also for the nature of worm
outbreaks. by the way this took about 2 hours to implement and several
more to run. i should improve its efficiency.
right now the agenda is: fix the known issues, instrument it a bit
better for anyone else to use it (and myself, eg to set up arbitrary topologies
or measure various aspects of the system), and run some simulations
to answer a few questions i have.
and finally i updated the backend of MyBookmarkBlogger, using tcl and
tcllib's htmlparse. once i'm confident its working reasonably well i'll
turn it back on automatically. right now all updates have been manually
filtered.
as much as i complain about tcl, when you find it suits your needs it's
not half bad.
|
next Thursday, Dec 04, 2003 @ 07:48pm |
previous Tuesday, Dec 02, 2003 @ 08:51pm
| archives
|
Last modified: Tuesday, Dec 02, 2003 @ 10:35pm
|
copyright © 2002-2005 jose nazario, all rights reserved.