Date: Tue, 16 May 2000 09:37:44 -0700 (PDT) From: John Polstra <jdp@polstra.com> To: n@nectar.com Cc: hackers@freebsd.org Subject: Re: need to borrow a clue re: rtld Message-ID: <200005161637.JAA82865@vashon.polstra.com> In-Reply-To: <20000516002513.A65118@bone.nectar.com> References: <20000516002513.A65118@bone.nectar.com>
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In article <20000516002513.A65118@bone.nectar.com>,
Jacques A . Vidrine <n@nectar.com> wrote:
> Messing about with Dante (the SOCKS5 replacement), I've encountered
> some difficulty with run-time linking that I don't understand.
>
> In brief:
>
> $ env LD_PRELOAD=libdsocks.so telnet # works
> $ env LD_PRELOAD=libdsocks.so xchat # undefined symbol '_gethostbyname'
> $ env LD_PRELOAD=libc.so:libdsocks.so xchat # works
Which version of FreeBSD?
If you have time, please rebuild "src/libexec/rtld-elf" with
DEBUG_FLAGS=-DDEBUG. Make a copy of your existing
"/usr/libexec/ld-elf.so.1" and then install the debugging version.
Run your first test case like this:
script Log.1
env LD_DEBUG=1 LD_PRELOAD=libdsocks.so telnet
(exit telnet and get out of "script")
and likewise for the failing test case (with a different filename
for script, of course). Send the output to me and I'll try to
figure out what's happening.
After you're done, you should restore your original (non-debugging)
rtld. It's more efficient and also probably more secure.
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa
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