elf/ldconfig.c

   1 /* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Andreas Jaeger <aj@suse.de>, 1999.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <alloca.h>
  21 #include <argp.h>
  22 #include <dirent.h>
  23 #include <elf.h>
  24 #include <error.h>
  25 #include <errno.h>
  26 #include <inttypes.h>
  27 #include <libintl.h>
  28 #include <stdio.h>
  29 #include <stdio_ext.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <sys/fcntl.h>
  34 #include <sys/mman.h>
  35 #include <sys/stat.h>
  36 #include <sys/types.h>
  37
  38 #include "ldconfig.h"
  39 #include "dl-cache.h"
  40
  41 #include "dl-procinfo.h"
  42
  43 #ifndef LD_SO_CONF
  44 # define LD_SO_CONF SYSCONFDIR "/ld.so.conf"
  45 #endif
  46
  47 /* Get libc version number.  */
  48 #include <version.h>
  49
  50 #define PACKAGE _libc_intl_domainname
  51
  52 static const struct
  53 {
  54   const char *name;
  55   int flag;
  56 } lib_types[] =
  57 {
  58   {"libc4", FLAG_LIBC4},
  59   {"libc5", FLAG_ELF_LIBC5},
  60   {"libc6", FLAG_ELF_LIBC6},
  61   {"glibc2", FLAG_ELF_LIBC6}
  62 };
  63
  64
  65 /* List of directories to handle.  */
  66 struct dir_entry
  67 {
  68   char *path;
  69   int flag;
  70   ino64_t ino;
  71   dev_t dev;
  72   struct dir_entry *next;
  73 };
  74
  75 /* The list is unsorted, contains no duplicates.  Entries are added at
  76    the end.  */
  77 static struct dir_entry *dir_entries;
  78
  79 /* Flags for different options.  */
  80 /* Print Cache.  */
  81 static int opt_print_cache;
  82
  83 /* Be verbose.  */
  84 int opt_verbose;
  85
  86 /* Format to support.  */
  87 /* 0: only libc5/glibc2; 1: both; 2: only glibc 2.2.  */
  88 int opt_format = 1;
  89
  90 /* Build cache.  */
  91 static int opt_build_cache = 1;
  92
  93 /* Generate links.  */
  94 static int opt_link = 1;
  95
  96 /* Only process directories specified on the command line.  */
  97 static int opt_only_cline;
  98
  99 /* Path to root for chroot.  */
 100 static char *opt_chroot;
 101
 102 /* Manually link given shared libraries.  */
 103 static int opt_manual_link;
 104
 105 /* Cache file to use.  */
 106 static char *cache_file;
 107
 108 /* Configuration file.  */
 109 static const char *config_file;
 110
 111 /* Mask to use for important hardware capabilities.  */
 112 static unsigned long int hwcap_mask = HWCAP_IMPORTANT;
 113
 114 /* Name and version of program.  */
 115 static void print_version (FILE *stream, struct argp_state *state);
 116 void (*argp_program_version_hook) (FILE *, struct argp_state *)
 117      = print_version;
 118
 119 /* Definitions of arguments for argp functions.  */
 120 static const struct argp_option options[] =
 121 {
 122   { "print-cache", 'p', NULL, 0, N_("Print cache"), 0},
 123   { "verbose", 'v', NULL, 0, N_("Generate verbose messages"), 0},
 124   { NULL, 'N', NULL, 0, N_("Don't build cache"), 0},
 125   { NULL, 'X', NULL, 0, N_("Don't generate links"), 0},
 126   { NULL, 'r', "ROOT", 0, N_("Change to and use ROOT as root directory"), 0},
 127   { NULL, 'C', "CACHE", 0, N_("Use CACHE as cache file"), 0},
 128   { NULL, 'f', "CONF", 0, N_("Use CONF as configuration file"), 0},
 129   { NULL, 'n', NULL, 0, N_("Only process directories specified on the command line.  Don't build cache."), 0},
 130   { NULL, 'l', NULL, 0, N_("Manually link individual libraries."), 0},
 131   { "format", 'c', "FORMAT", 0, N_("Format to use: new, old or compat (default)"), 0},
 132   { NULL, 0, NULL, 0, NULL, 0 }
 133 };
 134
 135 /* Short description of program.  */
 136 static const char doc[] = N_("Configure Dynamic Linker Run Time Bindings.");
 137
 138 /* Prototype for option handler.  */
 139 static error_t parse_opt (int key, char *arg, struct argp_state *state);
 140
 141 /* Data structure to communicate with argp functions.  */
 142 static struct argp argp =
 143 {
 144   options, parse_opt, NULL, doc, NULL, NULL, NULL
 145 };
 146
 147 /* Check if string corresponds to an important hardware capability or
 148    a platform.  */
 149 static int
 150 is_hwcap_platform (const char *name)
 151 {
 152   int hwcap_idx = _dl_string_hwcap (name);
 153
 154   if (hwcap_idx != -1 && ((1 << hwcap_idx) & hwcap_mask))
 155     return 1;
 156
 157   hwcap_idx = _dl_string_platform (name);
 158   if (hwcap_idx != -1)
 159     return 1;
 160
 161 #ifdef USE_TLS
 162   if (strcmp (name, "tls") == 0)
 163     return 1;
 164 #endif
 165
 166   return 0;
 167 }
 168
 169 /* Get hwcap (including platform) encoding of path.  */
 170 static uint64_t
 171 path_hwcap (const char *path)
 172 {
 173   char *str = xstrdup (path);
 174   char *ptr;
 175   uint64_t hwcap = 0;
 176   uint64_t h;
 177
 178   size_t len;
 179
 180   len = strlen (str);
 181   if (str[len] == '/')
 182     str[len] = '\0';
 183
 184   /* Search pathname from the end and check for hwcap strings.  */
 185   for (;;)
 186     {
 187       ptr = strrchr (str, '/');
 188
 189       if (ptr == NULL)
 190         break;
 191
 192       h = _dl_string_hwcap (ptr + 1);
 193
 194       if (h == (uint64_t) -1)
 195         {
 196           h = _dl_string_platform (ptr + 1);
 197           if (h == (uint64_t) -1)
 198             {
 199 #ifdef USE_TLS
 200               if (strcmp (ptr + 1, "tls") == 0)
 201                 h = 63;
 202               else
 203 #endif
 204                 break;
 205             }
 206         }
 207       hwcap += 1ULL << h;
 208
 209       /* Search the next part of the path.  */
 210       *ptr = '\0';
 211     }
 212
 213   free (str);
 214   return hwcap;
 215 }
 216
 217 /* Handle program arguments.  */
 218 static error_t
 219 parse_opt (int key, char *arg, struct argp_state *state)
 220 {
 221   switch (key)
 222     {
 223     case 'C':
 224       cache_file = arg;
 225       break;
 226     case 'f':
 227       config_file = arg;
 228       break;
 229     case 'l':
 230       opt_manual_link = 1;
 231       break;
 232     case 'N':
 233       opt_build_cache = 0;
 234       break;
 235     case 'n':
 236       opt_build_cache = 0;
 237       opt_only_cline = 1;
 238       break;
 239     case 'p':
 240       opt_print_cache = 1;
 241       break;
 242     case 'r':
 243       opt_chroot = arg;
 244       break;
 245     case 'v':
 246       opt_verbose = 1;
 247       break;
 248     case 'X':
 249       opt_link = 0;
 250       break;
 251     case 'c':
 252       if (strcmp (arg, "old") == 0)
 253         opt_format = 0;
 254       else if (strcmp (arg, "compat") == 0)
 255         opt_format = 1;
 256       else if (strcmp (arg, "new") == 0)
 257         opt_format = 2;
 258       break;
 259     default:
 260       return ARGP_ERR_UNKNOWN;
 261     }
 262
 263   return 0;
 264 }
 265
 266 /* Print the version information.  */
 267 static void
 268 print_version (FILE *stream, struct argp_state *state)
 269 {
 270   fprintf (stream, "ldconfig (GNU %s) %s\n", PACKAGE, VERSION);
 271   fprintf (stream, gettext ("\
 272 Copyright (C) %s Free Software Foundation, Inc.\n\
 273 This is free software; see the source for copying conditions.  There is NO\n\
 274 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
 275 "), "2003");
 276   fprintf (stream, gettext ("Written by %s.\n"),
 277            "Andreas Jaeger");
 278 }
 279
 280 /* Add a single directory entry.  */
 281 static void
 282 add_single_dir (struct dir_entry *entry, int verbose)
 283 {
 284   struct dir_entry *ptr, *prev;
 285
 286   ptr = dir_entries;
 287   prev = ptr;
 288   while (ptr != NULL)
 289     {
 290       /* Check for duplicates.  */
 291       if (ptr->ino == entry->ino && ptr->dev == entry->dev)
 292         {
 293           if (opt_verbose && verbose)
 294             error (0, 0, _("Path `%s' given more than once"), entry->path);
 295           /* Use the newer information.  */
 296           ptr->flag = entry->flag;
 297           free (entry->path);
 298           free (entry);
 299           break;
 300         }
 301       prev = ptr;
 302       ptr = ptr->next;
 303     }
 304   /* Is this the first entry?  */
 305   if (ptr == NULL && dir_entries == NULL)
 306     dir_entries = entry;
 307   else if (ptr == NULL)
 308     prev->next = entry;
 309 }
 310
 311 /* Add one directory to the list of directories to process.  */
 312 static void
 313 add_dir (const char *line)
 314 {
 315   char *equal_sign;
 316   struct dir_entry *entry;
 317   unsigned int i;
 318   struct stat64 stat_buf;
 319
 320   entry = xmalloc (sizeof (struct dir_entry));
 321   entry->next = NULL;
 322
 323   /* Search for an '=' sign.  */
 324   entry->path = xstrdup (line);
 325   equal_sign = strchr (entry->path, '=');
 326   if (equal_sign)
 327     {
 328       *equal_sign = '\0';
 329       ++equal_sign;
 330       entry->flag = FLAG_ANY;
 331       for (i = 0; i < sizeof (lib_types) / sizeof (lib_types[0]); ++i)
 332         if (strcmp (equal_sign, lib_types[i].name) == 0)
 333           {
 334             entry->flag = lib_types[i].flag;
 335             break;
 336           }
 337       if (entry->flag == FLAG_ANY)
 338         error (0, 0, _("%s is not a known library type"), equal_sign);
 339     }
 340   else
 341     {
 342       entry->flag = FLAG_ANY;
 343     }
 344
 345   /* Canonify path: for now only remove leading and trailing
 346      whitespace and the trailing slashes slashes.  */
 347   i = strlen (entry->path) - 1;
 348
 349   while (isspace (entry->path[i]) && i > 0)
 350     entry->path[i--] = '\0';
 351
 352   while (entry->path[i] == '/' && i > 0)
 353     entry->path[i--] = '\0';
 354
 355   if (stat64 (entry->path, &stat_buf))
 356     {
 357       if (opt_verbose)
 358         error (0, errno, _("Can't stat %s"), entry->path);
 359       free (entry->path);
 360       free (entry);
 361       return;
 362     }
 363
 364   entry->ino = stat_buf.st_ino;
 365   entry->dev = stat_buf.st_dev;
 366
 367  add_single_dir (entry, 1);
 368 }
 369
 370
 371 static int
 372 chroot_stat (const char *real_path, const char *path, struct stat64 *st)
 373 {
 374   int ret;
 375   char *canon_path;
 376
 377   if (!opt_chroot)
 378     return stat64 (real_path, st);
 379
 380   ret = lstat64 (real_path, st);
 381   if (ret || !S_ISLNK (st->st_mode))
 382     return ret;
 383
 384   canon_path = chroot_canon (opt_chroot, path);
 385   if (canon_path == NULL)
 386     return -1;
 387
 388   ret = stat64 (canon_path, st);
 389   free (canon_path);
 390   return ret;
 391 }
 392
 393 /* Create a symbolic link from soname to libname in directory path.  */
 394 static void
 395 create_links (const char *real_path, const char *path, const char *libname,
 396               const char *soname)
 397 {
 398   char *full_libname, *full_soname;
 399   char *real_full_libname, *real_full_soname;
 400   struct stat64 stat_lib, stat_so, lstat_so;
 401   int do_link = 1;
 402   int do_remove = 1;
 403   /* XXX: The logics in this function should be simplified.  */
 404
 405   /* Get complete path.  */
 406   full_libname = alloca (strlen (path) + strlen (libname) + 2);
 407   full_soname = alloca (strlen (path) + strlen (soname) + 2);
 408   sprintf (full_libname, "%s/%s", path, libname);
 409   sprintf (full_soname, "%s/%s", path, soname);
 410   if (opt_chroot)
 411     {
 412       real_full_libname = alloca (strlen (real_path) + strlen (libname) + 2);
 413       real_full_soname = alloca (strlen (real_path) + strlen (soname) + 2);
 414       sprintf (real_full_libname, "%s/%s", real_path, libname);
 415       sprintf (real_full_soname, "%s/%s", real_path, soname);
 416     }
 417   else
 418     {
 419       real_full_libname = full_libname;
 420       real_full_soname = full_soname;
 421     }
 422
 423   /* Does soname already exist and point to the right library?  */
 424   if (chroot_stat (real_full_soname, full_soname, &stat_so) == 0)
 425     {
 426       if (chroot_stat (real_full_libname, full_libname, &stat_lib))
 427         {
 428           error (0, 0, _("Can't stat %s\n"), full_libname);
 429           return;
 430         }
 431       if (stat_lib.st_dev == stat_so.st_dev
 432           && stat_lib.st_ino == stat_so.st_ino)
 433         /* Link is already correct.  */
 434         do_link = 0;
 435       else if (lstat64 (full_soname, &lstat_so) == 0
 436                && !S_ISLNK (lstat_so.st_mode))
 437         {
 438           error (0, 0, _("%s is not a symbolic link\n"), full_soname);
 439           do_link = 0;
 440           do_remove = 0;
 441         }
 442     }
 443   else if (lstat64 (real_full_soname, &lstat_so) != 0
 444            || !S_ISLNK (lstat_so.st_mode))
 445     /* Unless it is a stale symlink, there is no need to remove.  */
 446     do_remove = 0;
 447
 448   if (opt_verbose)
 449     printf ("\t%s -> %s", soname, libname);
 450
 451   if (do_link && opt_link)
 452     {
 453       /* Remove old link.  */
 454       if (do_remove)
 455         if (unlink (real_full_soname))
 456           {
 457             error (0, 0, _("Can't unlink %s"), full_soname);
 458             do_link = 0;
 459           }
 460       /* Create symbolic link.  */
 461       if (do_link && symlink (libname, real_full_soname))
 462         {
 463           error (0, 0, _("Can't link %s to %s"), full_soname, libname);
 464           do_link = 0;
 465         }
 466       if (opt_verbose)
 467         {
 468           if (do_link)
 469             fputs (_(" (changed)\n"), stdout);
 470           else
 471             fputs (_(" (SKIPPED)\n"), stdout);
 472         }
 473     }
 474   else if (opt_verbose)
 475     fputs ("\n", stdout);
 476 }
 477
 478 /* Manually link the given library.  */
 479 static void
 480 manual_link (char *library)
 481 {
 482   char *path;
 483   char *real_path;
 484   char *real_library;
 485   char *libname;
 486   char *soname;
 487   struct stat64 stat_buf;
 488   int flag;
 489   unsigned int osversion;
 490
 491   /* Prepare arguments for create_links call.  Split library name in
 492      directory and filename first.  Since path is allocated, we've got
 493      to be careful to free at the end.  */
 494   path = xstrdup (library);
 495   libname = strrchr (path, '/');
 496
 497   if (libname)
 498     {
 499       /* Successfully split names.  Check if path is just "/" to avoid
 500          an empty path.  */
 501       if (libname == path)
 502         {
 503           libname = library + 1;
 504           path = xrealloc (path, 2);
 505           strcpy (path, "/");
 506         }
 507       else
 508         {
 509           *libname = '\0';
 510           ++libname;
 511         }
 512     }
 513   else
 514     {
 515       /* There's no path, construct one. */
 516       libname = library;
 517       path = xrealloc (path, 2);
 518       strcpy (path, ".");
 519     }
 520
 521   if (opt_chroot)
 522     {
 523       real_path = chroot_canon (opt_chroot, path);
 524       if (real_path == NULL)
 525         {
 526           error (0, errno, _("Can't find %s"), path);
 527           free (path);
 528           return;
 529         }
 530       real_library = alloca (strlen (real_path) + strlen (libname) + 2);
 531       sprintf (real_library, "%s/%s", real_path, libname);
 532     }
 533   else
 534     {
 535       real_path = path;
 536       real_library = library;
 537     }
 538
 539   /* Do some sanity checks first.  */
 540   if (lstat64 (real_library, &stat_buf))
 541     {
 542       error (0, errno, _("Can't lstat %s"), library);
 543       free (path);
 544       return;
 545     }
 546   /* We don't want links here!  */
 547   else if (!S_ISREG (stat_buf.st_mode))
 548     {
 549       error (0, 0, _("Ignored file %s since it is not a regular file."),
 550              library);
 551       free (path);
 552       return;
 553     }
 554   if (process_file (real_library, library, libname, &flag, &osversion,
 555                     &soname, 0))
 556     {
 557       error (0, 0, _("No link created since soname could not be found for %s"),
 558              library);
 559       free (path);
 560       return;
 561     }
 562   create_links (real_path, path, libname, soname);
 563   free (soname);
 564   free (path);
 565 }
 566
 567
 568 /* Read a whole directory and search for libraries.
 569    The purpose is two-fold:
 570    - search for libraries which will be added to the cache
 571    - create symbolic links to the soname for each library
 572
 573    This has to be done separatly for each directory.
 574
 575    To keep track of which libraries to add to the cache and which
 576    links to create, we save a list of all libraries.
 577
 578    The algorithm is basically:
 579    for all libraries in the directory do
 580      get soname of library
 581      if soname is already in list
 582        if new library is newer, replace entry
 583        otherwise ignore this library
 584      otherwise add library to list
 585
 586    For example, if the two libraries libxy.so.1.1 and libxy.so.1.2
 587    exist and both have the same soname, e.g. libxy.so, a symbolic link
 588    is created from libxy.so.1.2 (the newer one) to libxy.so.
 589    libxy.so.1.2 and libxy.so are added to the cache - but not
 590    libxy.so.1.1.  */
 591
 592 /* Information for one library.  */
 593 struct dlib_entry
 594 {
 595   char *name;
 596   char *soname;
 597   int flag;
 598   int is_link;
 599   unsigned int osversion;
 600   struct dlib_entry *next;
 601 };
 602
 603
 604 static void
 605 search_dir (const struct dir_entry *entry)
 606 {
 607   DIR *dir;
 608   struct dirent64 *direntry;
 609   char *file_name, *dir_name, *real_file_name, *real_name;
 610   int file_name_len, real_file_name_len, len;
 611   char *soname;
 612   struct dlib_entry *dlibs;
 613   struct dlib_entry *dlib_ptr;
 614   struct stat64 lstat_buf, stat_buf;
 615   int is_link, is_dir;
 616   uint64_t hwcap = path_hwcap (entry->path);
 617   unsigned int osversion;
 618
 619   file_name_len = PATH_MAX;
 620   file_name = alloca (file_name_len);
 621
 622   dlibs = NULL;
 623
 624   if (opt_verbose)
 625     {
 626       if (hwcap != 0)
 627         printf ("%s: (hwcap: 0x%" PRIx64 ")\n", entry->path, hwcap);
 628       else
 629         printf ("%s:\n", entry->path);
 630     }
 631
 632   if (opt_chroot)
 633     {
 634       dir_name = chroot_canon (opt_chroot, entry->path);
 635       real_file_name_len = PATH_MAX;
 636       real_file_name = alloca (real_file_name_len);
 637     }
 638   else
 639     {
 640       dir_name = entry->path;
 641       real_file_name_len = 0;
 642       real_file_name = file_name;
 643     }
 644
 645   if (dir_name == NULL || (dir = opendir (dir_name)) == NULL)
 646     {
 647       if (opt_verbose)
 648         error (0, errno, _("Can't open directory %s"), entry->path);
 649       if (opt_chroot && dir_name)
 650         free (dir_name);
 651       return;
 652     }
 653
 654   while ((direntry = readdir64 (dir)) != NULL)
 655     {
 656       int flag;
 657 #ifdef _DIRENT_HAVE_D_TYPE
 658       /* We only look at links and regular files.  */
 659       if (direntry->d_type != DT_UNKNOWN
 660           && direntry->d_type != DT_LNK
 661           && direntry->d_type != DT_REG
 662           && direntry->d_type != DT_DIR)
 663         continue;
 664 #endif /* _DIRENT_HAVE_D_TYPE  */
 665       /* Does this file look like a shared library or is it a hwcap
 666          subdirectory?  The dynamic linker is also considered as
 667          shared library.  */
 668       if (((strncmp (direntry->d_name, "lib", 3) != 0
 669             && strncmp (direntry->d_name, "ld-", 3) != 0)
 670            || strstr (direntry->d_name, ".so") == NULL)
 671           && (
 672 #ifdef _DIRENT_HAVE_D_TYPE
 673               direntry->d_type == DT_REG ||
 674 #endif
 675               !is_hwcap_platform (direntry->d_name)))
 676         continue;
 677       len = strlen (entry->path) + strlen (direntry->d_name);
 678       if (len > file_name_len)
 679         {
 680           file_name_len = len + 1;
 681           file_name = alloca (file_name_len);
 682           if (!opt_chroot)
 683             real_file_name = file_name;
 684         }
 685       sprintf (file_name, "%s/%s", entry->path, direntry->d_name);
 686       if (opt_chroot)
 687         {
 688           len = strlen (dir_name) + strlen (direntry->d_name);
 689           if (len > real_file_name_len)
 690             {
 691               real_file_name_len = len + 1;
 692               real_file_name = alloca (real_file_name_len);
 693             }
 694           sprintf (real_file_name, "%s/%s", dir_name, direntry->d_name);
 695         }
 696 #ifdef _DIRENT_HAVE_D_TYPE
 697       if (direntry->d_type != DT_UNKNOWN)
 698         lstat_buf.st_mode = DTTOIF (direntry->d_type);
 699       else
 700 #endif
 701         if (__builtin_expect (lstat64 (real_file_name, &lstat_buf), 0))
 702           {
 703             error (0, errno, _("Cannot lstat %s"), file_name);
 704             continue;
 705           }
 706
 707       is_link = S_ISLNK (lstat_buf.st_mode);
 708       if (is_link)
 709         {
 710           /* In case of symlink, we check if the symlink refers to
 711              a directory. */
 712           if (__builtin_expect (stat64 (real_file_name, &stat_buf), 0))
 713             {
 714               if (opt_verbose)
 715                 error (0, errno, _("Cannot stat %s"), file_name);
 716
 717               /* Remove stale symlinks.  */
 718               if (strstr (direntry->d_name, ".so."))
 719                 unlink (real_file_name);
 720               continue;
 721             }
 722           is_dir = S_ISDIR (stat_buf.st_mode);
 723         }
 724       else
 725         is_dir = S_ISDIR (lstat_buf.st_mode);
 726
 727       if (is_dir && is_hwcap_platform (direntry->d_name))
 728         {
 729           /* Handle subdirectory later.  */
 730           struct dir_entry *new_entry;
 731
 732           new_entry = xmalloc (sizeof (struct dir_entry));
 733           new_entry->path = xstrdup (file_name);
 734           new_entry->flag = entry->flag;
 735           new_entry->next = NULL;
 736           if (is_link)
 737             {
 738               new_entry->ino = stat_buf.st_ino;
 739               new_entry->dev = stat_buf.st_dev;
 740             }
 741           else
 742             {
 743 #ifdef _DIRENT_HAVE_D_TYPE
 744               /* We have filled in lstat only #ifndef
 745                  _DIRENT_HAVE_D_TYPE.  Fill it in if needed.  */
 746               if (direntry->d_type != DT_UNKNOWN
 747                   && __builtin_expect (lstat64 (real_file_name, &lstat_buf),
 748                                        0))
 749                 {
 750                   error (0, errno, _("Cannot lstat %s"), file_name);
 751                   free (new_entry->path);
 752                   free (new_entry);
 753                   continue;
 754                 }
 755 #endif
 756
 757               new_entry->ino = lstat_buf.st_ino;
 758               new_entry->dev = lstat_buf.st_dev;
 759             }
 760           add_single_dir (new_entry, 0);
 761           continue;
 762         }
 763       else if (!S_ISREG (lstat_buf.st_mode) && !is_link)
 764         continue;
 765
 766       if (opt_chroot && is_link)
 767         {
 768           real_name = chroot_canon (opt_chroot, file_name);
 769           if (real_name == NULL)
 770             {
 771               if (strstr (file_name, ".so") == NULL)
 772                 error (0, 0, _("Input file %s not found.\n"), file_name);
 773               continue;
 774             }
 775         }
 776       else
 777         real_name = real_file_name;
 778
 779       if (process_file (real_name, file_name, direntry->d_name, &flag,
 780                         &osversion, &soname, is_link))
 781         {
 782           if (real_name != real_file_name)
 783             free (real_name);
 784           continue;
 785         }
 786
 787       if (real_name != real_file_name)
 788         free (real_name);
 789
 790       /* Links will just point to itself.  */
 791       if (is_link)
 792         {
 793           free (soname);
 794           soname = xstrdup (direntry->d_name);
 795         }
 796
 797       if (flag == FLAG_ELF
 798           && (entry->flag == FLAG_ELF_LIBC5
 799               || entry->flag == FLAG_ELF_LIBC6))
 800         flag = entry->flag;
 801       /* Some sanity checks to print warnings.  */
 802       if (opt_verbose)
 803         {
 804           if (flag == FLAG_ELF_LIBC5 && entry->flag != FLAG_ELF_LIBC5
 805               && entry->flag != FLAG_ANY)
 806             error (0, 0, _("libc5 library %s in wrong directory"), file_name);
 807           if (flag == FLAG_ELF_LIBC6 && entry->flag != FLAG_ELF_LIBC6
 808               && entry->flag != FLAG_ANY)
 809             error (0, 0, _("libc6 library %s in wrong directory"), file_name);
 810           if (flag == FLAG_LIBC4 && entry->flag != FLAG_LIBC4
 811               && entry->flag != FLAG_ANY)
 812             error (0, 0, _("libc4 library %s in wrong directory"), file_name);
 813         }
 814
 815       /* Add library to list.  */
 816       for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
 817         {
 818           /* Is soname already in list?  */
 819           if (strcmp (dlib_ptr->soname, soname) == 0)
 820             {
 821               /* Prefer a file to a link, otherwise check which one
 822                  is newer.  */
 823               if ((!is_link && dlib_ptr->is_link)
 824                   || (is_link == dlib_ptr->is_link
 825                       && _dl_cache_libcmp (dlib_ptr->name, direntry->d_name) < 0))
 826                 {
 827                   /* It's newer - add it.  */
 828                   /* Flag should be the same - sanity check.  */
 829                   if (dlib_ptr->flag != flag)
 830                     {
 831                       if (dlib_ptr->flag == FLAG_ELF
 832                           && (flag == FLAG_ELF_LIBC5 || flag == FLAG_ELF_LIBC6))
 833                         dlib_ptr->flag = flag;
 834                       else if ((dlib_ptr->flag == FLAG_ELF_LIBC5
 835                                 || dlib_ptr->flag == FLAG_ELF_LIBC6)
 836                                && flag == FLAG_ELF)
 837                         dlib_ptr->flag = flag;
 838                       else
 839                         error (0, 0, _("libraries %s and %s in directory %s have same soname but different type."),
 840                                dlib_ptr->name, direntry->d_name, entry->path);
 841                     }
 842                   free (dlib_ptr->name);
 843                   dlib_ptr->osversion = osversion;
 844                   dlib_ptr->name = xstrdup (direntry->d_name);
 845                   dlib_ptr->is_link = is_link;
 846                 }
 847               /* Don't add this library, abort loop.  */
 848               /* Also free soname, since it's dynamically allocated.  */
 849               free (soname);
 850               break;
 851             }
 852         }
 853       /* Add the library if it's not already in.  */
 854       if (dlib_ptr == NULL)
 855         {
 856           dlib_ptr = (struct dlib_entry *)xmalloc (sizeof (struct dlib_entry));
 857           dlib_ptr->name = xstrdup (direntry->d_name);
 858           dlib_ptr->flag = flag;
 859           dlib_ptr->osversion = osversion;
 860           dlib_ptr->soname = soname;
 861           dlib_ptr->is_link = is_link;
 862           /* Add at head of list.  */
 863           dlib_ptr->next = dlibs;
 864           dlibs = dlib_ptr;
 865         }
 866     }
 867
 868   closedir (dir);
 869
 870   /* Now dlibs contains a list of all libs - add those to the cache
 871      and created all symbolic links.  */
 872   for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
 873     {
 874       /* Don't create links to links.  */
 875       if (dlib_ptr->is_link == 0)
 876         create_links (dir_name, entry->path, dlib_ptr->name,
 877                       dlib_ptr->soname);
 878       if (opt_build_cache)
 879         add_to_cache (entry->path, dlib_ptr->soname, dlib_ptr->flag,
 880                       dlib_ptr->osversion, hwcap);
 881     }
 882
 883   /* Free all resources.  */
 884   while (dlibs)
 885     {
 886       dlib_ptr = dlibs;
 887       free (dlib_ptr->soname);
 888       free (dlib_ptr->name);
 889       dlibs = dlibs->next;
 890       free (dlib_ptr);
 891     }
 892
 893   if (opt_chroot && dir_name)
 894     free (dir_name);
 895 }
 896
 897 /* Search through all libraries.  */
 898 static void
 899 search_dirs (void)
 900 {
 901   struct dir_entry *entry;
 902
 903   for (entry = dir_entries; entry != NULL; entry = entry->next)
 904     search_dir (entry);
 905
 906   /* Free all allocated memory.  */
 907   while (dir_entries)
 908     {
 909       entry = dir_entries;
 910       dir_entries = dir_entries->next;
 911       free (entry->path);
 912       free (entry);
 913     }
 914 }
 915
 916
 917 /* Parse configuration file.  */
 918 static void
 919 parse_conf (const char *filename)
 920 {
 921   FILE *file = NULL;
 922   char *line = NULL;
 923   const char *canon;
 924   size_t len = 0;
 925
 926   if (opt_chroot)
 927     {
 928       canon = chroot_canon (opt_chroot, filename);
 929       if (canon)
 930         file = fopen (canon, "r");
 931       else
 932         canon = filename;
 933     }
 934   else
 935     {
 936       canon = filename;
 937       file = fopen (filename, "r");
 938     }
 939
 940   if (file == NULL)
 941     {
 942       error (0, errno, _("Can't open configuration file %s"), canon);
 943       if (canon != filename)
 944         free ((char *) canon);
 945       return;
 946     }
 947
 948   /* No threads use this stream.  */
 949   __fsetlocking (file, FSETLOCKING_BYCALLER);
 950
 951   if (canon != filename)
 952     free ((char *) canon);
 953
 954   do
 955     {
 956       ssize_t n = getline (&line, &len, file);
 957       if (n < 0)
 958         break;
 959
 960       if (line[n - 1] == '\n')
 961         line[n - 1] = '\0';
 962
 963       /* Because the file format does not know any form of quoting we
 964          can search forward for the next '#' character and if found
 965          make it terminating the line.  */
 966       *strchrnul (line, '#') = '\0';
 967
 968       /* Remove leading whitespace.  NUL is no whitespace character.  */
 969       char *cp = line;
 970       while (isspace (*cp))
 971         ++cp;
 972
 973       /* If the line is blank it is ignored.  */
 974       if (cp[0] == '\0')
 975         continue;
 976
 977       add_dir (cp);
 978     }
 979   while (!feof_unlocked (file));
 980
 981   /* Free buffer and close file.  */
 982   free (line);
 983   fclose (file);
 984 }
 985
 986 /* Honour LD_HWCAP_MASK.  */
 987 static void
 988 set_hwcap (void)
 989 {
 990   char *mask = getenv ("LD_HWCAP_MASK");
 991
 992   if (mask)
 993     hwcap_mask = strtoul (mask, NULL, 0);
 994 }
 995
 996
 997 int
 998 main (int argc, char **argv)
 999 {
1000   int remaining;
1001
1002   /* Parse and process arguments.  */
1003   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
1004
1005   /* Remaining arguments are additional libraries if opt_manual_link
1006      is not set.  */
1007   if (remaining != argc && !opt_manual_link)
1008     {
1009       int i;
1010       for (i = remaining; i < argc; ++i)
1011         add_dir (argv[i]);
1012     }
1013
1014   set_hwcap ();
1015
1016   if (opt_chroot)
1017     {
1018       /* Normalize the path a bit, we might need it for printing later.  */
1019       char *endp = strchr (opt_chroot, '\0');
1020       while (endp > opt_chroot && endp[-1] == '/')
1021         --endp;
1022       *endp = '\0';
1023       if (endp == opt_chroot)
1024         opt_chroot = NULL;
1025
1026       if (opt_chroot)
1027         {
1028           /* It is faster to use chroot if we can.  */
1029           if (!chroot (opt_chroot))
1030             {
1031               if (chdir ("/"))
1032                 error (EXIT_FAILURE, errno, _("Can't chdir to /"));
1033               opt_chroot = NULL;
1034             }
1035         }
1036     }
1037
1038   if (cache_file == NULL)
1039     {
1040       cache_file = alloca (strlen (LD_SO_CACHE) + 1);
1041       strcpy (cache_file, LD_SO_CACHE);
1042     }
1043
1044   if (config_file == NULL)
1045     config_file = LD_SO_CONF;
1046
1047   if (opt_print_cache)
1048     {
1049       if (opt_chroot)
1050         {
1051           char *p = chroot_canon (opt_chroot, cache_file);
1052           if (p == NULL)
1053             error (EXIT_FAILURE, errno, _("Can't open cache file %s\n"),
1054                    cache_file);
1055           cache_file = p;
1056         }
1057       print_cache (cache_file);
1058       if (opt_chroot)
1059         free (cache_file);
1060       exit (0);
1061     }
1062
1063   if (opt_chroot)
1064     {
1065       /* Canonicalize the directory name of cache_file, not cache_file,
1066          because we'll rename a temporary cache file to it.  */
1067       char *p = strrchr (cache_file, '/');
1068       char *canon = chroot_canon (opt_chroot,
1069                                   p ? (*p = '\0', cache_file) : "/");
1070
1071       if (canon == NULL)
1072         {
1073           error (EXIT_FAILURE, errno,
1074                  _("Can't open cache file directory %s\n"),
1075                  p ? cache_file : "/");
1076         }
1077
1078       if (p)
1079         ++p;
1080       else
1081         p = cache_file;
1082
1083       cache_file = alloca (strlen (canon) + strlen (p) + 2);
1084       sprintf (cache_file, "%s/%s", canon, p);
1085       free (canon);
1086     }
1087
1088   if (opt_manual_link)
1089     {
1090       /* Link all given libraries manually.  */
1091       int i;
1092
1093       for (i = remaining; i < argc; ++i)
1094         manual_link (argv[i]);
1095
1096       exit (0);
1097     }
1098
1099
1100   if (opt_build_cache)
1101     init_cache ();
1102
1103   if (!opt_only_cline)
1104     {
1105       /* Always add the standard search paths.  */
1106       add_dir (SLIBDIR);
1107       if (strcmp (SLIBDIR, LIBDIR))
1108         add_dir (LIBDIR);
1109
1110       parse_conf (config_file);
1111     }
1112
1113   search_dirs ();
1114
1115   if (opt_build_cache)
1116     save_cache (cache_file);
1117
1118   return 0;
1119 }