3e74e2e3bb
Normally one would dlopen() a shared object's basename, not its absolute
path. However, lib/krb5/plugin.c, in an effort to be zero-conf-ish,
wants to readdir() to find plugins to load, and in the process it ends
up defeating the RTLD's search-the-caller's-rpath.
This commit partially addresses this by allowing the use of $ORIGIN in
plugin_dir values and using them for the default (except on OS X).
This allows multiple Heimdal versions installed on the same host, but
with different plugin ABIs, to co-exist. A step forward for doing make
check on hosts where Heimdal is installed.
For now we hardcode $ORIGIN/../lib/plugin/krb5 (linux, Solaris, *BSD),
or $ORIGIN (Windows; for assemblies objects need to be in the same
directory) and we eval $ORIGIN by using dladdr() (Linux, Solaris) or
GetModuleHandleEx() (Win32, via a dladdr() wrapper in libroken) to find
the path to libkrb5 whose dirname to use as $ORIGIN. For Windows,
because we need the plugins to be in the same directory as libkrb5, we
require a prefix on plugin DLLs ("plugin_krb5_") to distinguish them
from other objects.
We should add a special token to mean "look in $ORIGIN, sure, but
dlopen() the plugin basenames only (so the RTLD can search the rpath)".
Heimdal is a Kerberos 5 implementation. For information how to install see <http://www.h5l.org/compile.html>. There are briefer man pages for most of the commands. Bug reports and bugs are appreciated, see more under Bug reports in the manual on how we prefer them: <heimdal-bugs@h5l.org>. For more information see the web-page at <http://www.h5l.org/> or the mailing lists: heimdal-announce@sics.se low-volume announcement heimdal-discuss@sics.se high-volume discussion send a mail to heimdal-announce-request@sics.se and heimdal-discuss-request@sics.se respectively to subscribe.