elf/ldconfig.c

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