Category: Geek

I recently tried out an RSS aggregator extension for my browser, and I have to say, I’m not really impressed so far. It *works*, but I find the following a bit annoying:

1) Inconsistent context. Some sites put the whole damn article in the RSS entries, some only put the first ‘x’ number of words.
2) Lack of comment information. Often I’m interested in seeing any new comments on older entries, but the RSS file doesn’t even tell me how many comments there are so I can’t tell if there are any new ones
3) Inconsistent HTML usage. Some sites put HTML within the RSS entry, but some don’t, which is important on sites where things like accompanying images are important to the entry.

As a result I usually wind up visiting the site manually anyway to get the proper layout, images, comments, etc., so checking in the RSS aggregator first didn’t really do any good.

I can see one area in which RSS would be quite useful, when you want to check large numbers of infrequently-updated sites for new entries without having to visit every single one. It just doesn’t do much to help me out. It sounds great in theory, so maybe it’s just the implementations and usage of it that’s not up to snuff yet.

I’m sure by now everyone and their dog has heard about the Windows NT/2K source code being leaked, and I have to say, I feel a bit sorry for them.

Now before you bite my head off, no, I’m not going soft on them. Windows still sucks technically, their business practices are still shady, and I still try to avoid buying from them when I can. It’s still their code though, and it’s their right to control it. By application of The Golden Rule, I can’t condone something happening to them that I wouldn’t want to happen to myself. If our company code ever got leaked, I’d probably crawl under a rock and die of embarrassment at having all of my coding sins exposed to the world.

Now that it’s out though, will I look at it? Hell no, that code is poison to any professional programmer. The last thing I need is Microsoft out to ruin my professional career just because there’s even the slightest suspicion I may have glanced at it, or to have any future contributions to open source projects subject to suspicion of being tainted knowledge. Just look at what SCO’s up to to see where that leads.

You learn an awful lot when you run your own site, and it’s mostly driven by what people try to do to you. This week’s lesson was about ‘dark crawlers,’ web spiders that don’t play by the rules.

Any program that crawls the web for information (mostly search engines), is supposed to follow the robots exclusion standard kept in the robots.txt file. Not every part of a web site is suitable for crawling — for example, the /cgi-bin/mt-comments.cgi… links on my site would just contain redundant information already in the main articles and would place extra load on the server — so you use that file to tell crawlers which parts of your site not to bother loading. You can also use it to stop crawlers that are behaving in ways you don’t like (e.g., polling too often) based on a unique part of their user agent name.

Adherence to that standard is entirely voluntary though, and some crawlers ignore it entirely. Yesterday I noticed a large number of hits coming from two class-C subnets. Although they appeared to be regular web browsers by their user agents (one Mac, one Windows), they were very rapidly working their way through every article on the site, in numerical order. A Google check on the IP address range quickly revealed that they were part of a company called ‘Web Content International’ which is apparently notorious for this kind of dark crawling.

A couple of new firewall rules to drop packets from them stopped their crawling, but then my kernel logs were getting flooded with firewall intrusion notices. They were apparently content to sit there retrying every few seconds for however long it took to get back in. Allowing them back in and having Apache return a 403 Forbidden page to requests from their address ranges instead seemed to finally make them stop.

Is that kind of crawling really that bad? Crawling is a natural web activity now, the site is public information, and these guys probably don’t intend any harm, so it doesn’t seem *too* bad. There are worse offenders out there too, such as dark crawlers that specifically go into areas marked as ‘Disallowed’ in robots.txt even if they weren’t part of the original crawl, hoping to find juicy details like e-mail addresses to spam. Still, if they want to crawl they should be open about admitting they’re doing so by following the robot standards. If they’re going to be sneaky about getting my data, I’m perfectly within my rights in being sneaky in denying it to them.

Okay, having addressed 64-bit hardware the question remains, who cares? What does it actually mean to you?

Well, nothing really. For all the end-user knows the system could be 8-bit or 500-bit or whatever internally, and it doesn’t matter. Linux or Windows or whatever you use will still look, feel, and run the same way. The only people it really makes a big difference to are the programmers, but in a roundabout way it does eventually wind up affecting the end-user.
Continue reading “Nibbles-n-bits-n-bits-n-bits-n-bits-n-…”

Yeesh, I’m falling behind on all the tech news. I only just found out about the BTX form factor which is supposed to be available fairly soon.

It sounds great on paper, allowing smaller cases, better cooling of components, more silent operation, etc., but already my hands are cringing in fear. Why? Because every time I open one of my cases to work on the internals, I wind up getting cuts on my hands from *somewhere*. I’m still not entirely sure where and I may not even notice until hours later, but something inside those cases is trying to murder me. Or cut my fingers off, at least. Smaller cases are just going to make it even worse!

I don’t think this is what they meant by progress sometimes requiring the sacrifice of blood…

AMD has actually been around for quite a while, but it’s their line of Intel-compatible processors that they’re now most famous for. Now however, Intel will be making AMD-compatible processors…

What happened? Basically, Intel lost the 64-bit race.
Continue reading “Is This Irony Or Silicony?”

A RAID array may save your data from drive failure, but it won’t protect it from brain farts.

heide:/media/video/anime$ mkdir tmp ; cd tmp
heide:/media/video/anime/tmp$ cp ../bagi_part*
heide:/media/video/anime/tmp$ ls
heide:/media/video/anime/tmp$

Wait, what did I just do…

I just copied the part 1 file over top of the part 2 file, that’s what… Gotta be careful with those wildcard expansions, especially when ‘cp’ and ‘mv’ are involved. (In this case I forgot the ‘.’ parameter at the end to tell it to copy the files here instead of over each other.)

Fortunately I hadn’t wiped the Linux partition on the old system yet and could recopy it back from there. Laziness pays off sometimes…

Lotus Notes must die. It was pushed onto us when we got bought out by our parent company and we had to integrate with their e-mail system, and it’s come to be universally loathed around the office. Outlook/Exchange had their own fair share of problems, but at least they were well-known and livable.
Continue reading “How Do I Hate Thee? Let Me Count The Ways…”

Yeesh. My server had been up for almost a full month since the last reboot, but I go away for a week and what happens? A mere eight hours after leaving the house, one of the hard drives flakes out and leaves the system hung for the rest of the week…

The War on Spam is getting to the point where you need better automated tools; having to manually adjust procmail filters for every new trick was quickly becoming annoying.

So, I finally decided to give SpamAssassin a whirl. It’s always been highly recommended but I’d been a bit hesitant to use it since it looked like it might be overkill. It’s the kind of thing you install to handle spam across entire corporate networks (we use it at work here too), so I was expecting something sendmail-like in its difficulty to configure and admin. It turned out to be pretty painless, though — do the ‘make install’, set up the .forward and .procmailrc files (the samples included work just fine), and ta-da, you’re done and your e-mail is now being spam-filtered.

The important question is, of course: does it work? The answer is yes…and no. So far it has caught a good number of spam messages and not accidentally flagged any valid e-mail as false positives. There are however still a few types of messages making it through the filter:

1) Viruses. Unfortunately Swen and its ilk are still circulating around the net far too much, and with little text in the message to parse and none of the spammer’s tricks being used, it’s hard for SpamAssassin to catch these. Technically it’s not really SA’s job to catch viruses; I’ll have to find another package and use it to do additional virus filtering instead.

2) Short, generic spam. These are those messages with vague subjects like “hi”, “lose it”, “can u spend few mins?” etc. and worded like a friendly greeting. Since most of the usual spammer’s tricks are missing, SA can’t judge these very well.

However, there is hope for the latter case: SA uses ‘Bayesian filtering’ to attempt to learn what spam looks like. If I keep feeding messages like those to the database, it should eventually start to be able to tell the difference between them and valid e-mail and start filtering them automatically. In theory, anyway. Only time will tell how well it will work, as it has to build up a history first.

In the meantime I still have to handle those viruses and some spam messages manually. It’s still better than no filtering at all though, and using the SA tools to teach it about the spam it misses isn’t too much of a hassle.

I finally got around to buying a proper set of headphones for my portable music. Unfortunately, I was focusing primarily on making sure that they were light and unobtrusive — I have a fantastic quality set of headphones at home already, but they’re big and bulky and shut out nearly all other sound, which doesn’t make them very practical for day-to-day casual use. That led me to a set of Sony headphones that only cost around $16, but they seemed to be just what I was looking for.

Of course, they turned out to be utter crap. Too much of the sound leaks away, especially high frequencies, the headband is some cheap plastic that I swear is going to break within a month, and the jack is ultra-quirky. The slightest shift causes crackling, volume fading, and the right channel vanishing entirely.

I’m probably going to have to go down to somewhere like A&B Sound to find a *true* decent set of headphones that won’t break easily, sound good, and work reliably, and it’ll probably cost an arm and a leg. Of course, there are limits…

I was getting a bit tired of the same old playlist on my PocketPC, so I took over 400 of my favourite MP3s, transcoded them to ~96kbps Ogg Vorbis format, and wrote a script to randomly pick out around 256 megs worth of them each time it was run, to build new playlists that would fit in the memory card. The hardest part of all that was not the transcoding, or writing the script; it was just getting the damn files transferred to the PocketPC.

About the only way to transfer files to it is to open it up under Explorer, and drag and drop files into the folder you want, and the ActiveSync program takes care of copying them over. However, attempting to do so would invariably halt and cause the USB connection to break after three or four files were copied. I’d have to resync, delete the partially copied file, and restart the copy where it left off. That would be merely annoying except that after a while it wouldn’t just break the connection, but it would also corrupt the memory card.

Now I had to reformat the memory card, but guess what, Windows CE doesn’t include any way to format cards. I had to go looking for utilities on the net, and most of the ones I ran across were commercial bundles of utilities, and I wasn’t about to shell out money just to format this stupid card. I finally found a free set of tools to do the formatting, and could use the card again.

I also finally found out that other people were having the same problem, and that there was a patch available for ActiveSync that fixes problems with large file transfers, and applied it. Now the files are transferring properly and there haven’t been any breaks or corruption yet, but it’s going very slowly at around 100K/s. Even with an old USB 1.0 connection it should be ten times faster…

Though in the end it’s now working, it’s frustrating that it had to be so much trouble in the first place. Devices like PDAs are supposed to just work right out of the box, but they couldn’t even get something as basic as transferring files working properly…

It’s amazing how much crap accumulates on our computers. While working on something, I hit an unexpected ‘out of disk space’ error, so I started poking around trying to find stuff to get rid of so I could free up some space. It didn’t take long, and I figured I may as well spend a bit of time tidying up my whole system.

After I was finished I had deleted over 19 gigs of files. This system only has a 40 gig drive to begin with. Multi-megabyte trace files from bugs long since fixed, database snapshots from customers from years ago, source code from previous versions that’s no longer needed, online manuals I’d saved to disk and only used briefly, ten-line test programs written to quickly check something, software installed and used once and then forgotten, temp files from programs that failed to clean up properly, and all sorts of other junk was hiding about in the nooks and crannies of the filesystem.

It’s especially fun when you find files with no immediately obvious use, in a vaguely-named folder, with no documentation. Anything I couldn’t figure out within 30 seconds got thrown in the recycle bin.

Of course it’ll probably only take me a couple more months to fill the drive back up with junk again…

The latest 2.6.0-test10 Linux kernel has been released and is expected to be the last in the test series before an official release, and in keeping with old traditions like the ‘greased weasel’ series, Linus has christened this one with the name ‘stoned beaver.’

(*eyes Linus suspiciously*)

Red Hat has just recently announced that they will no longer be offering the basic, free Red Hat Linux distribution and will only sell and support their Red Hat Enterprise Linux package, meant primarily for businesses. Their CEO has also come right out and said that “I would say that for the consumer market place, Windows probably continues to be the right product line.”

There is already much wailing and gnashing of teeth about how Red Hat has turned traitor, this is a slap in the face, blah blah blah. And I have to say…I don’t care.

Not just because I don’t use Red Hat on my systems, but because Red Hat simply isn’t obligated to push Linux onto the desktop. One of the great things about the Linux world is that you’re free to do whatever you want with it, and if Red Hat feels that their best chance of success is to focus on the business market, then they’re perfectly free to do so. There are plenty of other distributions out there, so if the others think they can do a better job on the desktop, now’s the time for them to take their shot.

Is their CEO right about Windows? Well, partly… Although Linux is perfectly viable, the desktop market they speak of extends all the way down to people who barely know where to plug things in and what to do with the funny-coloured round thing in the jewel case. Vendors have already dumbed down the installation process to their level, but mostly only on Windows. You can grab any random piece of hardware at the store and be assured that there will be full Windows drivers right in the box, but there’s no guarantee that it will work on Linux at all unless you check complex device support charts first. That’s not really Linux’s fault since it should be up to the vendor to provide the drivers, but it’s a chicken-and-egg problem. Linux is great once you’ve selected the proper hardware for it and installed and configured everything properly, but not everyone has a Linux guru handy to help them out.

It’s all perfectly fine to me — I’m a hobbyist user, not a casual desktop user, so all these little quirks and such don’t really bother me.

The 2.6 branch of the Linux kernels is fast approaching ‘release’ status — the current version 2.6.0-test8 is essentially a release candidate, even if they don’t call it that specifically. I was curious just what was new in it and the latest version of Slackware I installed is supposed to be 2.6-ready, so I gave it a whirl.

What difference do kernel changes really make though? Well, here is a summary of the major changes between 2.4 and 2.6, and there’s a lot of them. Most are fairly subtle and arcane, so I’m just going to focus on the ones that really matter to me:
Continue reading “The Kernel’s New Recipe”