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strange date

geggo — Mon, 05 Apr 2010 22:18:42 +0000

i just realized that the date of all posts is set to 2007..
interesting bug :)

[ARMada] bugfix release

geggo — Sat, 27 Feb 2010 13:50:05 +0000

I fixed the totally crappy and hackish BL calculation routine.
Now it should work fine for all types of jumps forward and backward.

No idea why i never realized its bugs (?)

[ARMada] small updates

geggo — Wed, 19 Aug 2009 17:33:21 +0000

there are small updates to ARMada. let me cite the SVN log:

Revision: 3585
Author: geggo
Date: 19:55:28, Mittwoch, 19. August 2009
Message:
fixed parameter limit check for ADD SP, val operation
—-
Modified : /trunk/nokia/ARMada/compiler.c

Revision: 3579
Author: geggo
Date: 19:29:51, Mittwoch, 19. August 2009
Message:
fixed ADDSP, ADDPC, SUBPC descriptions to match new ADD/SUB type opcode
fixed ADD Rn, SP, val opcode
fixed .code description
—-
Modified : /trunk/nokia/ARMada/ARM_Compiler.aps
Modified : /trunk/nokia/ARMada/ARM_Compiler.rc
Modified : /trunk/nokia/ARMada/ARM_Compiler.vcproj
Modified : /trunk/nokia/ARMada/code.c
Modified : /trunk/nokia/ARMada/code.h
Modified : /trunk/nokia/ARMada/compiler.c

[GSM] New FFT Visualizer Component

geggo — Sun, 26 Jul 2009 23:41:33 +0000

This time I built a new FFT Visualizer Component.
It’s a split “FFT Plot”+”Waterfall” view, which has the “FFT Plot” in the top and the waterfall in the bottom half.

In the video (watch fullscreen in HD mode) you cannot see the dB markers very clearly.
These are on the left and the right border of the “FFT Plot” (top part) and labelled in 50dB steps.

The “Waterfall” has a configurable upper and lower dB limit (changed with mouse wheel, see lower left corner).
Values above the upper limit are drawn cyan, those with a dB value lower than the lower limit are drawn black.
The values between are colored with a color between.

Here a video of that component:

[GSM] SDCCH listening

geggo — Sun, 14 Jun 2009 16:56:29 +0000

The GSM Analyzer now is able to sniff SDCCH and SACCH channels too.

What we can see there? Well, not much.
Just the usual “who are you?” stuff followed by a CIPHER COMMAND.
After that, all the traffic is encrypted using specified cipher.

I uploaded a dump here, a short video is here ;)

[GSM] Code updates

geggo — Thu, 11 Jun 2009 00:19:01 +0000

On the videos you’ve maybe seen that my tool shows the bursts in some plot window. I used GDI for drawing the lines… damn this is soooo slooow…

Today i decided to switch to DirectX drawing for speedup. Ater some hours of playing around, I found out how to draw a plot easily. (using DrawUserPrimitives with LineStrip vertices)

The graph is reeeeaally fast now (displaying bursts in realtime) with just about 5% of CPU load. kewl :)

But the DirectX assemblies Microsoft provides seem to work only with x86.. oouch. So I looked for some solution and found SlimDX which is a managed DirectX library. Using this library I can now run my tools in x64 mode again.

How much faster my tool is in x64 mode?

Hm I think about 0.001% up to 0.002%… But hey, running 64 bit code is much cooler :)

I uploaded two dumps generated with my GSM Analyzer:

Dump 1 contains ~15 min dump without “SYSTEM INFORMATION” or “PAGING REQUEST” messages except those with an IMSI
Dump 2 contains just a few seconds with everything and is really ugly to read for this reason

[GSM] GSM Analyzer

geggo — Tue, 09 Jun 2009 01:54:56 +0000

As described in earlier blog posts, I coded a driver for an USB radio receiver which is comparable to USRP. So I’m able to “record” radio data and save it, or process it on-the-fly with some tools.

GSM Analyzer is a C# tool that demodulates and decodes the GMSK signal which GSM uses. Furthermore it decodes the L3 (Layer 3 Protocol) messages sent in the broadcast channel (BCCH). This means, I’m able to “tune in” into some GSM radio channel and sniff the packets which the base station (BTS) is sending. Usually thats just really public information like the provider ID, information about the network and such things. Nothing interesting.

People who know the nokia net monitor would just look up that in the phones menu…
I “just” select some radio frequency and look that up there using my tool ;)

That project is really just for fun. Some people call me crazy. No idea why they do that. Thats really not hard to decode. And it has nothing useful yet. Okay… if I’m able to decrypt the A5 crypted SDCCH/TCH traffic, that whole story really would get interesing. But thats still pure theory yet.

Maybe I will describe that stuff more in the near future. Maybe I will release the source code. Maybe I won’t :)

See the project page for some videos. (the text is the same, except for the video description)

[.NETrilo] another test release

geggo — Sat, 28 Feb 2009 21:19:24 +0000

i was so anxious to make .NETrilo usable so i spent another day implementing stuff.

today i implemented a DirectSound plugin (“snd_DirectX.dll”) that supports just playback for now. recording still has to be done, but that has to wait until i start the “input” stuff. (i.e. “inp_DirectX.dll”)

i also implemented GSM decoding. i used a version of the GSM codec that was ported to java and ported that to C#…
it performs very well… but the processor usages unbelieveable high :-/ (10 times more than the native client)

not sure, but i should make extra modules for the codecs. so i’m able to use different licenses for each module and we are able to use faster native libs for the standard platforms (win32/linux) and .NET versions of the codecs for others.

someone wants to help? :-/

[.NETrilo] first preview

geggo — Sat, 28 Feb 2009 03:14:10 +0000

here is an very early alpha of .NETrilo.

http://g3gg0.de/projects/NETrilo/NETrilo_alpha.exe

its just for connecting to v2.3 servers, browsing channels
and seeing what other users do :)

should work on linux/win32
(just tested win32 yet)

please reply, if it works for you :)

[CEntrilo] public SVN access

geggo — Fri, 25 Jul 2008 11:08:26 +0000

hi,

since i dont find some spare time to update CEntrilo, i made the SVN public.

http://svn.g3gg0.de/svn/default/trunk/misc/CEntrilo/

username: centrilo
password: behave!

simply get the source, look how it works and create a new, CLEAN tool from it.
would be really cool if you can keep the core platform independent.
i also somewhen tried to make a symbian client, but could not get beyond
connecting and hearing some noise when people talk ;)

cheers