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Sun Sep 18 19:00:15 2005 GMT: More WRT54G Firmware Hacking
Wed Sep 14 18:33:42 2005 GMT: SSH Brute Force Attack
Sun Sep 11 21:07:59 2005 GMT: WRT54G Fimware Hacking
I have recently been hacking a bit on my WRT54G firmware, mainly to just update the included software, but I have also added a small uptimes client. You can have a look at the router statistics here.
Thu Sep 01 20:26:08 2005 GMT: jabberd2 64-bit brokenness
Following up on a report of a reproducible crash of the s2s component of jabberd2, I have had a look at the source code to analyse the problem.
Wed Aug 24 22:50:57 2005 GMT: Where is all the RAM?
I have been scratching my head for some time now why the company's proxy server performance was quite bad in the past few weeks. Apparently, a lot of swapping was dramatically slowing down the machine, but I just couldn't figure out the reason for all the swapping, because the machine's configuration didn't change for quite a while.
Unfortunately, "ps" or "top" also weren't of much help here - they didn't show any unusual memory hogs, but "free" insisted that there was no free memory and only a few MBs used for buffers and caches.
Today, I finally looked through the /proc filesystem to see if I could find any unusual traces there. And yes, when looking at /proc/slabinfo I noticed that the kernel has allocated around 200000 "sock" object (consuming around 50000 4k pages or 200 MB of RAM). Hmm, maybe this was a left-over of one of those Bitdefender DoS attacks.
Well, a reboot seems to have fixed the problem for now.
Wed Aug 24 19:57:14 2005 GMT: Google Talk
Hmm, they use an open protocol (XMPP) with some proprietary extensions (VoIP signalling, although they claim to be documenting the extensions in the future) to build a closed service (by not allowing XMPP's server-to-server communication). And by installing their client software you "agree to automatically request and receive Updates" from their servers.
Sounds a lot like Microsoft, doesn't it? But, it's not, it's Google Talk.
BTW, there is an interesting article about Google in the IHT: Google taking on Microsoft's role of villain
Sat Aug 13 18:38:40 2005 GMT: Upgrading to Hoary Hedgehog
I have finally upgraded my Linux machine at home from Debian woody to Ubuntu Hoary Hedgehog. As this machine is already quite old, I haven't installed a GNOME/Nautilus desktop, but I have decided to switch to XFCE4 (and keeping fvwm as the window manager, of course).
Tue Aug 09 18:16:19 2005 GMT: One More Reason to Ignore Google
Mon Aug 08 19:17:15 2005 GMT: Concurrent Access To SQLite Database
Sun Aug 07 08:29:41 2005 GMT: Solaris Internals
Tue Aug 02 19:54:03 2005 GMT: Atom 1.0
Sun Jul 31 15:29:04 2005 GMT: Anti-Virus Software Flaws
