.so dynamic library mangling tool
Sergey Kuznetsov
tlug-9a/WvBvX2Qpg9hUCZPvPmw at public.gmane.org
Sun Dec 5 16:49:06 UTC 2004
Steve Harvey wrote:
>On Sat, Dec 04, 2004 at 10:12:46PM -0500, Sergey Kuznetsov wrote:
>
>
>>The issue was not the library itself ( the library at the right place,
>>at /lib directory )
>>but with the .so file itself.
>>that file is a optional part of the Asterisk PBX program, and it's G.729
>>codec library,
>>and specifically for GLIB 2.3 X86_64 platform under Gentoo.
>>The error Asterisk gives me is:
>>
>>[codec_g729a.so]Dec 4 19:34:04 WARNING[16384]: loader.c:248
>>ast_load_resource: /usr/lib/asterisk/modules/codec_g729a.so: undefined
>>symbol: gzread
>>Dec 4 19:34:04 WARNING[16384]: loader.c:429 load_modules: Loading
>>module codec_g729a.so failed!
>>
>>The ldd saying about codec_g729a.so is:
>># ldd codec_g729a.so
>> libc.so.6 => /lib/libc.so.6 (0x0000002a9567d000)
>> /lib64/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2
>>(0x000000552aaaa000)
>>
>>The nm -D codec_g729a.so saying is:
>> U gzclose
>> U gzdopen
>> U gzread
>>
>>The nm -D /lib/libz.so saying is:
>>00000000000035f0 T gzclose
>>00000000000026a0 T gzdopen
>>0000000000002ab0 T gzread
>>
>>The objdump -x codec_g729a.so saying is:
>>Dynamic Section:
>> NEEDED libc.so.6
>> INIT 0x35c0
>>
>>As you can see here is the NEEDED libz.so is absent. And this is I am
>>trying to fix. Thats why I need such tool who can mangle the any
>>library's header I want.
>>
>>
>>
> I assume that setting the LD_PRELOAD environment variable is not an
>option in your situation.
>
> I don't know of any single tool that will do that. Perhaps you might
>be able to carve the library up with objcopy and re-build it using ld
>and a specially crafted linker script in order to get both NEEDED
>entries.
>
> If you have write perms on /usr/local/lib, I might try building a
>customized libc to which the libz modules have been added, making it
>reachable via /usr/local/lib/libZ.so.6 (making sure that libZ is unique
>in your system). Ensure that its internal SONAME is "libZ.so.6" (vi
>makes a good binary editor), run ldconfig, then use a patched
>codec_g729a.so with the "libc.so.6" string in the file suitably altered.
>
>
>
LD_PRELOAD - does it!!!!
Thanks a looooooooooot Steve!
I completely forgot about LD_PRELOAD. IT did the trick.
All the Best!
Sergey.
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