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e2102c1422
1998-03-29 20:59 Ulrich Drepper <drepper@cygnus.com> * elf/Makefile: Fix typo. * elf/ldd.bash.in: Collect output of ldd --verify in verify_out. * elf/ldd.sh.in: Likewise. * elf/ldsodefs.h: Declare _dl_correct_cache_id. * elf/rtld.c (dl_main): In --verify mode allow platform specifc action. Use strsep correctly. (process_envvars): Allow platform specific variables. * sysdeps/generic/dl-cache.c (_dl_correct_cache_id): New variable. (_dl_load_cache_lookup): Test cache IDs found against _dl_correct_cache_id. * sysdeps/generic/dl-librecon.h: New file. * sysdeps/unix/sysv/linux/dl-librecon.h: New file. * sysdeps/unix/sysv/linux/lddlibc4.c: Include error.h. * sysdeps/unix/sysv/linux/ldd-rewrite.sed: New file.
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
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Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <unistd.h>
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#include <elf/ldsodefs.h>
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#include <sys/mman.h>
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/* System-dependent function to read a file's whole contents
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in the most convenient manner available. */
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extern void *_dl_sysdep_read_whole_file (const char *filename,
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size_t *filesize_ptr,
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int mmap_prot);
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#ifndef LD_SO_CACHE
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# define LD_SO_CACHE "/etc/ld.so.cache"
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#endif
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#define CACHEMAGIC "ld.so-1.7.0"
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struct cache_file
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{
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char magic[sizeof CACHEMAGIC - 1];
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unsigned int nlibs;
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struct
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{
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int flags; /* This is 1 for an ELF library. */
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unsigned int key, value; /* String table indices. */
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} libs[0];
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};
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/* This is the cache ID we expect. Normally it is 3 for glibc linked
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binaries. */
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int _dl_correct_cache_id = 3;
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/* Look up NAME in ld.so.cache and return the file name stored there,
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or null if none is found. */
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const char *
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_dl_load_cache_lookup (const char *name)
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{
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static struct cache_file *cache;
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static size_t cachesize;
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unsigned int i;
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const char *best;
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/* Print a message if the loading of libs is traced. */
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if (_dl_debug_libs)
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_dl_debug_message (1, " search cache=", LD_SO_CACHE, "\n", NULL);
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if (cache == NULL)
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{
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/* Read the contents of the file. */
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void *file = _dl_sysdep_read_whole_file (LD_SO_CACHE, &cachesize,
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PROT_READ);
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if (file && cachesize > sizeof *cache &&
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!memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1))
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/* Looks ok. */
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cache = file;
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else
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{
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if (file)
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__munmap (file, cachesize);
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cache = (void *) -1;
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return NULL;
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}
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}
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if (cache == (void *) -1)
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/* Previously looked for the cache file and didn't find it. */
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return NULL;
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best = NULL;
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for (i = 0; i < cache->nlibs; ++i)
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if ((cache->libs[i].flags == 1 ||
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cache->libs[i].flags == 3) && /* ELF library entry. */
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/* Make sure string table indices are not bogus before using them. */
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cache->libs[i].key < cachesize - sizeof *cache &&
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cache->libs[i].value < cachesize - sizeof *cache &&
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/* Does the name match? */
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! strcmp (name, ((const char *) &cache->libs[cache->nlibs] +
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cache->libs[i].key)))
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{
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if ((best == NULL) || (cache->libs[i].flags == _dl_correct_cache_id))
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{
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best = ((const char *) &cache->libs[cache->nlibs]
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+ cache->libs[i].value);
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if (cache->libs[i].flags == _dl_correct_cache_id)
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/* We've found an exact match for the shared object and no
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general `ELF' release. Stop searching. */
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break;
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}
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}
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/* Print our result if wanted. */
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if (_dl_debug_libs && best != NULL)
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_dl_debug_message (1, " trying file=", best, "\n", NULL);
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return best;
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}
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