Archive for the ‘Happy Hacking’ Category

Set Windows time at boot – the ultimate reference

Thursday, June 30th, 2016

While preparing some 200 non-domain-registered Windows 7 systems as POS systems, we came across a couple of dead BIOS batteries. Time on these machines would start 1-1-2009 every time and while you could forcibly setup the correct time by pushing a couple of buttons inside of Windows, the question arose if it would be possible to correct time automatically. Well, turns out: it is. (more…)

Upside Downternet v2.0

Sunday, January 3rd, 2016

I’ve always wanted to implement upside-down-ternet, but lacked the resources. But now it’s 2016 and you can make your wifi-stealing-neighbour’s web browser do all the hard work. This means that a simple OpenWRT router will have enough power to flip the internet – all of it, except for the ssl-protected areas. (more…)

Synology Crash Recovery

Sunday, January 4th, 2015

So, you own a Synology Disk Station and a disk broke. You messed up by trying to replace the wrong disk. You tried to fix it by reinserting the right disk but that didn’t help. Then you messed up even further by trying to change the volume – or something. You can’t even remember exactly just WHAT you did because of the shock, afterwards, when you found out the system just stopped working.
Well, here’s how to proceed. (more…)

Unbrick the Minix Neo X7 Mini – with Linux

Saturday, April 26th, 2014

Lately I bought a Minix Neo X7 Mini. Next thing you know: I brick the box. Here’s how to unbrick the thing – with Linux. It’s rather easy, too! (more…)

Syslog-ng intrusion detection

Tuesday, August 27th, 2013

There seems to be a problem using the file() destination for /proc files in Linux. When implementing Securing Your Server With Syslog-NG you will run into it. Please read below.
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(Not) rooting RK3066 systems

Friday, April 12th, 2013

The update updated, 2014-04-28: unbricking is fairly easy, see http://valentijn.sessink.nl/?p=517

Please note that I received some reports from people that tried to flash their RK3066 stuff – but it would not boot afterwards. And in fact, that’s what I experienced when I tried to flash my Minix Neo X5. (more…)

Rooting the Cube U30GT rk3066 android tablet

Friday, September 28th, 2012

I just bought a Cube U30GT Android tablet, based on the Rockchip RK3066 ARM chipset. Here are the instructions to root it under Linux. (more…)

Securing your server with Syslog-ng

Sunday, February 20th, 2011

There are many programs that help you secure your servers. There are simple firewalling programs and there are complex network intrusion detection systems. Depending on your demands, there seems to be a solution for everyone. Unless you’re picky and you think you can do better – like I did, when I wrote my own combination of syslog-ng and Linux iptables, skipping the middle man.

August 2013 update. There seems to be a problem using the syslog-ng file() destination on /proc in Linux. See http://valentijn.sessink.nl/?p=458 for more information.

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Knoeien met de cijfers van het CBS

Wednesday, December 22nd, 2010

Het Centraal Bureau voor de Statistiek doet zijn onderzoekjes anno 2010 nog steeds met een Windows-programma: u moet Microsoft Windows gebruiken om de door het CBS gevraagde gegevens te verzenden. Dat levert een statistische vertekening in de cijfers op (“gebruik van open source software”); erger is het, dat het dataverzamelingsprogramma zo lek is als een mandje. (more…)

MFOC improved

Saturday, November 27th, 2010

When I started using MFOC, from a the description (in Dutch) at ov-chipkaart.org, I immediately ran into the problem described here. A bit strange seemed, that reading the card sector after sector with 10 different predefined keys did not crash the reader, while immediately after starting to try to calculate new keys, the reader would crash. (more…)