Re: [DynInst_API:] Enumerating linked shared libraries with SymtabAPI/ ParseAPI

[Andreas Ziegler <ziegler@xxxxxxxxx>]

Hi,

jumping into the conversation as I'm also doing research on shared 
libraries and (in a broader sense) instrumentation as part of my PhD at 
the University Erlangen-NÃrnberg. :)
On 1/24/19 4:18 AM, Buddhika Chamith Kahawitage Don wrote:
> It doesn't seem to provide the full path to the linked library, just the 
> library name. So when I use the return value to construct a 
> SymtabCodeSource it fails. Any idea how to get the full path of the 
> linked library?
That depends on your current system and the execution environment. If 
you're looking at the executable or shared library using 'readelf' (for 
example with the -e parameter), you see that the file itself will only 
specify the (file-)name of the library it requires. The actual 
resolution to an absolute path is done in the linker and will take 
default library search paths as well as the LD_LIBRARY_PATH and 
LD_PRELOAD environment variables into account.
If you're on the system you want to analyze and want to see which 
libraries a given binary loads, try running 'ldd' on the binary in 
question, this will run the linker up to the point right before 
execution is handed over to the binary itself and print all imported 
libraries as well as their paths.
I'm quite interested in what you're working on, if you'd like you can 
drop me a private mail.
Regards,

Andreas


> On Wed, Jan 23, 2019 at 10:20 PM Buddhika Chamith Kahawitage Don 
> <budkahaw@xxxxxx <mailto:budkahaw@xxxxxx>> wrote:
>     Great! I will check this out.
>
>     Cheers
>     Buddhika
>
>     On Wed, Jan 23, 2019 at 10:01 PM Xiaozhu Meng <xmeng@xxxxxxxxxxx
>     <mailto:xmeng@xxxxxxxxxxx>> wrote:
>
>         Hi,
>
>         If I am going to do it, I will try Symtab::getDependencies(),
>         which should return a vector of paths of the dependencies:
>
>         https://github.com/dyninst/dyninst/blob/master/symtabAPI/h/Symtab.h#L366
>
>         Then, you can iterate over the vector to parse each of them.
>
>         Thanks,
>
>         --Xiaozhu
>
>         On Wed, Jan 23, 2019 at 10:20 AM Buddhika Chamith Kahawitage Don
>         <budkahaw@xxxxxx <mailto:budkahaw@xxxxxx>> wrote:
>
>             Hi All,
>
>             I need to enumerate and parse linked shared libraries of a
>             binary using Symtab API and Parse API. How can I do that? I
>             am currently using below code sequence to parse the binary.
>
>              Â Dyninst::SymtabAPI::Symtab* symtab;
>              Â bool isParsable =
>             Dyninst::SymtabAPI::Symtab::openFile(symtab, binary);
>              Â if (isParsable == false) {
>              ÂÂÂ const char* error = "error: file can not be parsed";
>              ÂÂÂ std::cout << error;
>              ÂÂÂ return;
>              Â }
>
>              Â // Create a new binary code object from the filename argument
>              Â Dyninst::ParseAPI::SymtabCodeSource* sts =
>              ÂÂÂÂÂ new Dyninst::ParseAPI::SymtabCodeSource(binary.c_str());
>              Â Dyninst::ParseAPI::CodeObject* co = new
>             Dyninst::ParseAPI::CodeObject(sts);
>              Â co->parse();
>
>              Â auto fit = co->funcs().begin();
>              Â for (; fit != co->funcs().end(); ++fit) {
>              ÂÂÂ Dyninst::ParseAPI::Function* f = *fit;
>              ÂÂÂ ....
>              Â }
>
>             Regards
>             Buddhika
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