Symbols manipulation

[Nick Clifton]

Hi Fernando,

> I have a program in binary format (no sources available) that
> crashes with a couple of "dynamic linker: symbol not found" errors
> when executed.  With 'ldd -r' I found that the program was
> dynamically linked to libsocket.so.1 and libc.so.1 and that the two
> "symbol not found" errors arise because neither "inet_pton" nor
> "inet_ntop" exist in those two libraries.  Then, by means of 'nm' I
> was able to locate the two objects in libresolv.so.1 , library that
> is never called by the binary program.
>
> Now, I have a question: Using one of the binutils, is it possible to
> "patch" the binary file so that it includes libresolv.so.1 or, put
> the other way around, extract "inet_pton" and "inet_ntop" from
> libresolv.so.1 and embed them in libsocket.so.1 for example ? 

If you have the sources for your libc (or you downlaod the sources for
glibc) you could build yur own copy of that library with the inet_*
functions added.

Cheers
        Nick