Re: Preloading libraries to override BSD IPC function symbols and recursion

[Matthew Mondor <mm_lists%pulsar-zone.net@localhost>]

On Fri, 23 Mar 2018 21:34:30 +0000
Taylor R Campbell <campbell+netbsd-tech-net%mumble.net@localhost> wrote:

> > Date: Fri, 23 Mar 2018 12:12:24 -0400
> > From: Matthew Mondor <mm_lists%pulsar-zone.net@localhost>
> > 
> > If in my nonet test I dlsym(3) "__socket30" instead of "socket", it
> > works fine.  Which begs the question: how are those programs
> > expected to know which symbol to use (they expect the standard
> > symbol name). Some tricks can be used to discover it, of course.
> > 
> > But is there a better solution to always get this right?  
> 
> Not really.  Overriding symbols is a black art in the first place, of
> course...  I'll leave further discussion of symbol versioning and ELF
> to experts on the subject like joerg, but here's the patch I sent to
> torsocks to fix the same issue:
> 
> https://trac.torproject.org/projects/tor/ticket/16432

Thanks again to both of you; I'll consider this part to be OS+version
specific then.

-- 
Matt