Now I have a .so file but no related headers attached.
Are there recommended methods to analysis and use the functions inside the library?

Ok, I think it can be two parts:
"how to load the library" and "how to use the library".

First I tried to use dlopen to load it,then compiling passed but segmentation fault occurred upon execution.

I tried with system built-in library instead and it's OK
so I wondered maybe I should hook gdb with the .so during execution to see what happened?

But before that I use nm to list the function names of the shared object,it works good so I guess the shared object was not broken.

Or maybe should I try to rebuild a header from the nm results?Is this possible? how?


I still programmed with dlopen() and tried to compile with -L[library_search_path] -l[library_name]

ex: -L/home/test -ltest

and got the following errors:

/home/test/ undefined reference to「SSL_connect」/home/test/ undefined reference to「TLSv1_client_method」/home/test/ undefined reference to「SSL_CTX_set_verify」/home/test/ undefined reference to「SSL_CTX_check_private_key」/home/test/ undefined reference to「SSL_get_peer_certificate」

I found OpenSSL has not been installed yet.
After installation was done, I compiled again with additional -lssl -lcrypto,
then compiling works but execution failed with followings:

error while loading shared libraries: cannot open shared object file: No such file or directory

The executable can't find the libssl installed,
so I add flags with -Wl,-rpath,/usr/local/lib,
Well, the library can be loaded now :)

Now I'm understanding how to use dlsym() with name-mangling functions...

  • You will be missing the parameters and calling convention - so not easy.– Richard CrittenFeb 13 at 17:55

Your Answer


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.