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You are here: Home arrow Ethical Hacking Discussions and Related Certificationsarrow Programmingarrow [newbie] re-compiling GPL on Linux
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Author Topic: [newbie] re-compiling GPL on Linux  (Read 11394 times)
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mark77
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« on: July 21, 2009, 01:59:48 AM »
i wanted to re-compile some GPL code of a router's Firmware in order to run some executables Linux.
The codes have been published by the producer himselfs!

what 'm mostly interested in is the executable "rgbin":
can you have a look and tell me whether the sourcecode is actually complete ?
besides, some external files, which are linked with included in the "rgbin" makefile, seem to be empty...?


the "rgbin"-related codes can be found this archive: http://ftp://ftp.dlink.co.uk/GPL/DI-524_E1_GPL.tgz
at these paths:

di524\userland\target\usr\sbin\rgbin
di524\progs.priv\rgbin\Makefile
di524\progs.priv\rgbin\rgbin

thanks a lot for your help!
Regards.
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mark77
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« Reply #1 on: July 23, 2009, 08:43:36 AM »
anybody can help ?
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mark77
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« Reply #2 on: August 04, 2009, 02:39:08 AM »
sorry...i need your help,
'cause i guess the codes don't have just to be compiled (makefile9,
but also re-compiled onto x86 (since the firmware's codes weere designed for MIPS processors)...

anyone can help ?
thanks
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Ketchup
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« Reply #3 on: August 04, 2009, 01:48:55 PM »
Mark77, I think that anytime you have to rewrite something for a different processor architecture, it's quite an undertaking.   I think that you are in for a bit of work on this one.   You or someone else would have to go through all of the code.
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mark77
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« Reply #4 on: August 04, 2009, 02:41:57 PM »
actually i'd need just the executable called "rgbin"...
could it be done ?
i wouldn't know how to make it  Huh

another source link:
http://ftp://ftp.dlink.se/Products/di-products/di-524/drivers_firmware/di524.source.tgz
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mark77
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« Reply #5 on: August 10, 2009, 01:18:33 PM »
ok, the source codes seem to be nested, so they have to be compiled entirely

after some struggle, i tried a compiling on Ubuntu (there's a tolchain provided for different archtecture...)
but when i run some tools, i get errors and no good output

for instance, if you give this commnand:
Code:
rgdb -D config.bin
(rgdb is an alias of rgbin, as far as i can see)
you get this message
Quote
bash: ./rgdb: cannot execute binary file

...what's wrong with it?
« Last Edit: August 10, 2009, 01:23:26 PM by mark77 » Logged
Ketchup
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« Reply #6 on: August 10, 2009, 02:20:54 PM »
I am not sure which toolchain you are using, but it's likely generating a binary file that is meant to run on a different architecture.   
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mark77
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« Reply #7 on: August 10, 2009, 04:31:53 PM »
hi!

actually, if you take a look at those files in the GPL
http://ftp://ftp.dlink.co.uk/GPL/DI-524_E1_GPL.tgz
they seem to me like these they show no source, on the contrary they look like the binary image (maybe) of the original firmware tool, which was cmpiled onto MIPS:

.\di524\userland\target\usr\sbin\rgbin
.\di524\progs.priv\rgbin\rgbin
.\di524\progs.priv\rgbin\Makefile

.\di524\userland\target\usr\sbin\rgdb
.\di524\tools\alpha\rgdb\rgdb
.\di524\tools\alpha\rgdb\Makefile

am i wrong?
« Last Edit: August 10, 2009, 04:33:48 PM by mark77 » Logged
Ketchup
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« Reply #8 on: August 10, 2009, 06:18:11 PM »
It looks like a binary file to me.   Does D-Link have a developer forum or another resource you can ask?   Much of this code is going to be specific to their equipment. 
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mark77
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« Reply #9 on: August 12, 2009, 06:55:06 AM »
yes, i already asked more than one D-Link support...but they answer telling they released the GPL but don't give support about that.

if you have some time left, may you try what i did and tell me if you have different results?

i used Ubuntu..i don't know if it depends on it...?

otherwise, i can only guess an alternative:
running the compiled  on a MIPS architecture's emulation, like this ?
http://www.qemu.org/
http://sourceforge.net/projects/aqemu/
...but i never did that, i wouldn't know how to deal with it
« Last Edit: August 12, 2009, 06:57:35 AM by mark77 » Logged
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