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           && (
 658 #ifdef _DIRENT_HAVE_D_TYPE
 659               direntry->d_type == DT_REG ||
 660 #endif
 661               !is_hwcap_platform (direntry->d_name)))
 662         continue;
 663       len = strlen (entry->path) + strlen (direntry->d_name);
 664       if (len > file_name_len)
 665         {
 666           file_name_len = len + 1;
 667           file_name = alloca (file_name_len);
 668           if (!opt_chroot)
 669             real_file_name = file_name;
 670         }
 671       sprintf (file_name, "%s/%s", entry->path, direntry->d_name);
 672       if (opt_chroot)
 673         {
 674           len = strlen (dir_name) + strlen (direntry->d_name);
 675           if (len > real_file_name_len)
 676             {
 677               real_file_name_len = len + 1;
 678               real_file_name = alloca (real_file_name_len);
 679             }
 680           sprintf (real_file_name, "%s/%s", dir_name, direntry->d_name);
 681         }
 682 #ifdef _DIRENT_HAVE_D_TYPE
 683       if (direntry->d_type != DT_UNKNOWN)
 684         lstat_buf.st_mode = DTTOIF (direntry->d_type);
 685       else
 686 #endif
 687         if (__builtin_expect (lstat64 (real_file_name, &lstat_buf), 0))
 688           {
 689             error (0, errno, _("Cannot lstat %s"), file_name);
 690             continue;
 691           }
 692
 693       is_link = S_ISLNK (lstat_buf.st_mode);
 694       if (is_link)
 695         {
 696           /* In case of symlink, we check if the symlink refers to
 697              a directory. */
 698           if (__builtin_expect (stat64 (real_file_name, &stat_buf), 0))
 699             {
 700               if (opt_verbose)
 701                 error (0, errno, _("Cannot stat %s"), file_name);
 702               continue;
 703             }
 704           is_dir = S_ISDIR (stat_buf.st_mode);
 705         }
 706       else
 707         is_dir = S_ISDIR (lstat_buf.st_mode);
 708
 709       if (is_dir && is_hwcap_platform (direntry->d_name))
 710         {
 711           /* Handle subdirectory later.  */
 712           struct dir_entry *new_entry;
 713
 714           new_entry = xmalloc (sizeof (struct dir_entry));
 715           new_entry->path = xstrdup (file_name);
 716           new_entry->flag = entry->flag;
 717           new_entry->next = NULL;
 718           if (is_link)
 719             {
 720               new_entry->ino = stat_buf.st_ino;
 721               new_entry->dev = stat_buf.st_dev;
 722             }
 723           else
 724             {
 725 #ifdef _DIRENT_HAVE_D_TYPE
 726               /* We have filled in lstat only #ifndef
 727                  _DIRENT_HAVE_D_TYPE.  Fill it in if needed.  */
 728               if (direntry->d_type != DT_UNKNOWN
 729                   && __builtin_expect (lstat64 (real_file_name, &lstat_buf),
 730                                        0))
 731                 {
 732                   error (0, errno, _("Cannot lstat %s"), file_name);
 733                   free (new_entry->path);
 734                   free (new_entry);
 735                   continue;
 736                 }
 737 #endif
 738
 739               new_entry->ino = lstat_buf.st_ino;
 740               new_entry->dev = lstat_buf.st_dev;
 741             }
 742           add_single_dir (new_entry, 0);
 743           continue;
 744         }
 745       else if (!S_ISREG (lstat_buf.st_mode) && !is_link)
 746         continue;
 747
 748       if (opt_chroot && is_link)
 749         {
 750           real_name = chroot_canon (opt_chroot, file_name);
 751           if (real_name == NULL)
 752             {
 753               if (strstr (file_name, ".so") == NULL)
 754                 error (0, 0, _("Input file %s not found.\n"), file_name);
 755               continue;
 756             }
 757         }
 758       else
 759         real_name = real_file_name;
 760
 761       if (process_file (real_name, file_name, direntry->d_name, &flag,
 762                         &osversion, &soname, is_link))
 763         {
 764           if (real_name != real_file_name)
 765             free (real_name);
 766           continue;
 767         }
 768
 769       if (real_name != real_file_name)
 770         free (real_name);
 771
 772       /* Links will just point to itself.  */
 773       if (is_link)
 774         {
 775           free (soname);
 776           soname = xstrdup (direntry->d_name);
 777         }
 778
 779       if (flag == FLAG_ELF
 780           && (entry->flag == FLAG_ELF_LIBC5
 781               || entry->flag == FLAG_ELF_LIBC6))
 782         flag = entry->flag;
 783       /* Some sanity checks to print warnings.  */
 784       if (opt_verbose)
 785         {
 786           if (flag == FLAG_ELF_LIBC5 && entry->flag != FLAG_ELF_LIBC5
 787               && entry->flag != FLAG_ANY)
 788             error (0, 0, _("libc5 library %s in wrong directory"), file_name);
 789           if (flag == FLAG_ELF_LIBC6 && entry->flag != FLAG_ELF_LIBC6
 790               && entry->flag != FLAG_ANY)
 791             error (0, 0, _("libc6 library %s in wrong directory"), file_name);
 792           if (flag == FLAG_LIBC4 && entry->flag != FLAG_LIBC4
 793               && entry->flag != FLAG_ANY)
 794             error (0, 0, _("libc4 library %s in wrong directory"), file_name);
 795         }
 796
 797       /* Add library to list.  */
 798       for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
 799         {
 800           /* Is soname already in list?  */
 801           if (strcmp (dlib_ptr->soname, soname) == 0)
 802             {
 803               /* Prefer a file to a link, otherwise check which one
 804                  is newer.  */
 805               if ((!is_link && dlib_ptr->is_link)
 806                   || (is_link == dlib_ptr->is_link
 807                       && _dl_cache_libcmp (dlib_ptr->name, direntry->d_name) < 0))
 808                 {
 809                   /* It's newer - add it.  */
 810                   /* Flag should be the same - sanity check.  */
 811                   if (dlib_ptr->flag != flag)
 812                     {
 813                       if (dlib_ptr->flag == FLAG_ELF
 814                           && (flag == FLAG_ELF_LIBC5 || flag == FLAG_ELF_LIBC6))
 815                         dlib_ptr->flag = flag;
 816                       else if ((dlib_ptr->flag == FLAG_ELF_LIBC5
 817                                 || dlib_ptr->flag == FLAG_ELF_LIBC6)
 818                                && flag == FLAG_ELF)
 819                         dlib_ptr->flag = flag;
 820                       else
 821                         error (0, 0, _("libraries %s and %s in directory %s have same soname but different type."),
 822                                dlib_ptr->name, direntry->d_name, entry->path);
 823                     }
 824                   free (dlib_ptr->name);
 825                   dlib_ptr->osversion = osversion;
 826                   dlib_ptr->name = xstrdup (direntry->d_name);
 827                   dlib_ptr->is_link = is_link;
 828                 }
 829               /* Don't add this library, abort loop.  */
 830               /* Also free soname, since it's dynamically allocated.  */
 831               free (soname);
 832               break;
 833             }
 834         }
 835       /* Add the library if it's not already in.  */
 836       if (dlib_ptr == NULL)
 837         {
 838           dlib_ptr = (struct dlib_entry *)xmalloc (sizeof (struct dlib_entry));
 839           dlib_ptr->name = xstrdup (direntry->d_name);
 840           dlib_ptr->flag = flag;
 841           dlib_ptr->osversion = osversion;
 842           dlib_ptr->soname = soname;
 843           dlib_ptr->is_link = is_link;
 844           /* Add at head of list.  */
 845           dlib_ptr->next = dlibs;
 846           dlibs = dlib_ptr;
 847         }
 848     }
 849
 850   closedir (dir);
 851
 852   /* Now dlibs contains a list of all libs - add those to the cache
 853      and created all symbolic links.  */
 854   for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
 855     {
 856       /* Don't create links to links.  */
 857       if (dlib_ptr->is_link == 0)
 858         create_links (dir_name, entry->path, dlib_ptr->name,
 859                       dlib_ptr->soname);
 860       if (opt_build_cache)
 861         add_to_cache (entry->path, dlib_ptr->soname, dlib_ptr->flag,
 862                       dlib_ptr->osversion, hwcap);
 863     }
 864
 865   /* Free all resources.  */
 866   while (dlibs)
 867     {
 868       dlib_ptr = dlibs;
 869       free (dlib_ptr->soname);
 870       free (dlib_ptr->name);
 871       dlibs = dlibs->next;
 872       free (dlib_ptr);
 873     }
 874
 875   if (opt_chroot && dir_name)
 876     free (dir_name);
 877 }
 878
 879 /* Search through all libraries.  */
 880 static void
 881 search_dirs (void)
 882 {
 883   struct dir_entry *entry;
 884
 885   for (entry = dir_entries; entry != NULL; entry = entry->next)
 886     search_dir (entry);
 887
 888   /* Free all allocated memory.  */
 889   while (dir_entries)
 890     {
 891       entry = dir_entries;
 892       dir_entries = dir_entries->next;
 893       free (entry->path);
 894       free (entry);
 895     }
 896 }
 897
 898
 899 /* Parse configuration file.  */
 900 static void
 901 parse_conf (const char *filename)
 902 {
 903   FILE *file = NULL;
 904   char *line = NULL;
 905   const char *canon;
 906   size_t len = 0;
 907
 908   if (opt_chroot)
 909     {
 910       canon = chroot_canon (opt_chroot, filename);
 911       if (canon)
 912         file = fopen (canon, "r");
 913       else
 914         canon = filename;
 915     }
 916   else
 917     {
 918       canon = filename;
 919       file = fopen (filename, "r");
 920     }
 921
 922   if (file == NULL)
 923     {
 924       error (0, errno, _("Can't open configuration file %s"), canon);
 925       if (canon != filename)
 926         free ((char *) canon);
 927       return;
 928     }
 929
 930   /* No threads use this stream.  */
 931   __fsetlocking (file, FSETLOCKING_BYCALLER);
 932
 933   if (canon != filename)
 934     free ((char *) canon);
 935
 936   do
 937     {
 938       ssize_t n = getline (&line, &len, file);
 939       if (n < 0)
 940         break;
 941
 942       if (line[n - 1] == '\n')
 943         line[n - 1] = '\0';
 944
 945       /* Because the file format does not know any form of quoting we
 946          can search forward for the next '#' character and if found
 947          make it terminating the line.  */
 948       *strchrnul (line, '#') = '\0';
 949
 950       /* If the line is blank it is ignored.  */
 951       if (line[0] == '\0')
 952         continue;
 953
 954       add_dir (line);
 955     } while (!feof (file));
 956
 957   /* Free buffer and close file.  */
 958   free (line);
 959   fclose (file);
 960 }
 961
 962 /* Honour LD_HWCAP_MASK.  */
 963 static void
 964 set_hwcap (void)
 965 {
 966   char *mask = getenv ("LD_HWCAP_MASK");
 967
 968   if (mask)
 969     hwcap_mask = strtoul (mask, NULL, 0);
 970 }
 971
 972
 973 int
 974 main (int argc, char **argv)
 975 {
 976   int remaining;
 977
 978   /* Parse and process arguments.  */
 979   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
 980
 981   /* Remaining arguments are additional libraries if opt_manual_link
 982      is not set.  */
 983   if (remaining != argc && !opt_manual_link)
 984     {
 985       int i;
 986       for (i = remaining; i < argc; ++i)
 987         add_dir (argv[i]);
 988     }
 989
 990   set_hwcap ();
 991
 992   if (opt_chroot)
 993     {
 994       /* Normalize the path a bit, we might need it for printing later.  */
 995       char *endp = strchr (opt_chroot, '\0');
 996       while (endp > opt_chroot && endp[-1] == '/')
 997         --endp;
 998       *endp = '\0';
 999       if (endp == opt_chroot)
1000         opt_chroot = NULL;
1001
1002       if (opt_chroot)
1003         {
1004           /* It is faster to use chroot if we can.  */
1005           if (!chroot (opt_chroot))
1006             {
1007               if (chdir ("/"))
1008                 error (EXIT_FAILURE, errno, _("Can't chdir to /"));
1009               opt_chroot = NULL;
1010             }
1011         }
1012     }
1013
1014   if (cache_file == NULL)
1015     {
1016       cache_file = alloca (strlen (LD_SO_CACHE) + 1);
1017       strcpy (cache_file, LD_SO_CACHE);
1018     }
1019
1020   if (config_file == NULL)
1021     config_file = LD_SO_CONF;
1022
1023   if (opt_print_cache)
1024     {
1025       if (opt_chroot)
1026         {
1027           char *p = chroot_canon (opt_chroot, cache_file);
1028           if (p == NULL)
1029             error (EXIT_FAILURE, errno, _("Can't open cache file %s\n"),
1030                    cache_file);
1031           cache_file = p;
1032         }
1033       print_cache (cache_file);
1034       if (opt_chroot)
1035         free (cache_file);
1036       exit (0);
1037     }
1038
1039   if (opt_chroot)
1040     {
1041       /* Canonicalize the directory name of cache_file, not cache_file,
1042          because we'll rename a temporary cache file to it.  */
1043       char *p = strrchr (cache_file, '/');
1044       char *canon = chroot_canon (opt_chroot,
1045                                   p ? (*p = '\0', cache_file) : "/");
1046
1047       if (canon == NULL)
1048         {
1049           error (EXIT_FAILURE, errno,
1050                  _("Can't open cache file directory %s\n"),
1051                  p ? cache_file : "/");
1052         }
1053
1054       if (p)
1055         ++p;
1056       else
1057         p = cache_file;
1058
1059       cache_file = alloca (strlen (canon) + strlen (p) + 2);
1060       sprintf (cache_file, "%s/%s", canon, p);
1061       free (canon);
1062     }
1063
1064   if (opt_manual_link)
1065     {
1066       /* Link all given libraries manually.  */
1067       int i;
1068
1069       for (i = remaining; i < argc; ++i)
1070         manual_link (argv[i]);
1071
1072       exit (0);
1073     }
1074
1075
1076   if (opt_build_cache)
1077     init_cache ();
1078
1079   if (!opt_only_cline)
1080     {
1081       /* Always add the standard search paths.  */
1082       add_dir (SLIBDIR);
1083       if (strcmp (SLIBDIR, LIBDIR))
1084         add_dir (LIBDIR);
1085
1086       parse_conf (config_file);
1087     }
1088
1089   search_dirs ();
1090
1091   if (opt_build_cache)
1092     save_cache (cache_file);
1093
1094   return 0;
1095 }