elf/ldconfig.c

   1 /* Copyright (C) 1999, 2000, 2001, 2002 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 "), "2002");
 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 trailing slashes.  */
 346   i = strlen (entry->path) - 1;
 347   while (entry->path[i] == '/' && i > 0)
 348     {
 349       entry->path[i] = '\0';
 350       --i;
 351     }
 352
 353   if (stat64 (entry->path, &stat_buf))
 354     {
 355       if (opt_verbose)
 356         error (0, errno, _("Can't stat %s"), entry->path);
 357       free (entry->path);
 358       free (entry);
 359       return;
 360     }
 361
 362   entry->ino = stat_buf.st_ino;
 363   entry->dev = stat_buf.st_dev;
 364
 365  add_single_dir (entry, 1);
 366 }
 367
 368
 369 static int
 370 chroot_stat (const char *real_path, const char *path, struct stat64 *st)
 371 {
 372   int ret;
 373   char *canon_path;
 374
 375   if (!opt_chroot)
 376     return stat64 (real_path, st);
 377
 378   ret = lstat64 (real_path, st);
 379   if (ret || !S_ISLNK (st->st_mode))
 380     return ret;
 381
 382   canon_path = chroot_canon (opt_chroot, path);
 383   if (canon_path == NULL)
 384     return -1;
 385
 386   ret = stat64 (canon_path, st);
 387   free (canon_path);
 388   return ret;
 389 }
 390
 391 /* Create a symbolic link from soname to libname in directory path.  */
 392 static void
 393 create_links (const char *real_path, const char *path, const char *libname,
 394               const char *soname)
 395 {
 396   char *full_libname, *full_soname;
 397   char *real_full_libname, *real_full_soname;
 398   struct stat64 stat_lib, stat_so, lstat_so;
 399   int do_link = 1;
 400   int do_remove = 1;
 401   /* XXX: The logics in this function should be simplified.  */
 402
 403   /* Get complete path.  */
 404   full_libname = alloca (strlen (path) + strlen (libname) + 2);
 405   full_soname = alloca (strlen (path) + strlen (soname) + 2);
 406   sprintf (full_libname, "%s/%s", path, libname);
 407   sprintf (full_soname, "%s/%s", path, soname);
 408   if (opt_chroot)
 409     {
 410       real_full_libname = alloca (strlen (real_path) + strlen (libname) + 2);
 411       real_full_soname = alloca (strlen (real_path) + strlen (soname) + 2);
 412       sprintf (real_full_libname, "%s/%s", real_path, libname);
 413       sprintf (real_full_soname, "%s/%s", real_path, soname);
 414     }
 415   else
 416     {
 417       real_full_libname = full_libname;
 418       real_full_soname = full_soname;
 419     }
 420
 421   /* Does soname already exist and point to the right library?  */
 422   if (chroot_stat (real_full_soname, full_soname, &stat_so) == 0)
 423     {
 424       if (chroot_stat (real_full_libname, full_libname, &stat_lib))
 425         {
 426           error (0, 0, _("Can't stat %s\n"), full_libname);
 427           return;
 428         }
 429       if (stat_lib.st_dev == stat_so.st_dev
 430           && stat_lib.st_ino == stat_so.st_ino)
 431         /* Link is already correct.  */
 432         do_link = 0;
 433       else if (lstat64 (full_soname, &lstat_so) == 0
 434                && !S_ISLNK (lstat_so.st_mode))
 435         {
 436           error (0, 0, _("%s is not a symbolic link\n"), full_soname);
 437           do_link = 0;
 438           do_remove = 0;
 439         }
 440     }
 441   else if (lstat64 (real_full_soname, &lstat_so) != 0
 442            || !S_ISLNK (lstat_so.st_mode))
 443     /* Unless it is a stale symlink, there is no need to remove.  */
 444     do_remove = 0;
 445
 446   if (opt_verbose)
 447     printf ("\t%s -> %s", soname, libname);
 448
 449   if (do_link && opt_link)
 450     {
 451       /* Remove old link.  */
 452       if (do_remove)
 453         if (unlink (real_full_soname))
 454           {
 455             error (0, 0, _("Can't unlink %s"), full_soname);
 456             do_link = 0;
 457           }
 458       /* Create symbolic link.  */
 459       if (do_link && symlink (libname, real_full_soname))
 460         {
 461           error (0, 0, _("Can't link %s to %s"), full_soname, libname);
 462           do_link = 0;
 463         }
 464       if (opt_verbose)
 465         {
 466           if (do_link)
 467             fputs (_(" (changed)\n"), stdout);
 468           else
 469             fputs (_(" (SKIPPED)\n"), stdout);
 470         }
 471     }
 472   else if (opt_verbose)
 473     fputs ("\n", stdout);
 474 }
 475
 476 /* Manually link the given library.  */
 477 static void
 478 manual_link (char *library)
 479 {
 480   char *path;
 481   char *real_path;
 482   char *real_library;
 483   char *libname;
 484   char *soname;
 485   struct stat64 stat_buf;
 486   int flag;
 487   unsigned int osversion;
 488
 489   /* Prepare arguments for create_links call.  Split library name in
 490      directory and filename first.  Since path is allocated, we've got
 491      to be careful to free at the end.  */
 492   path = xstrdup (library);
 493   libname = strrchr (path, '/');
 494
 495   if (libname)
 496     {
 497       /* Successfully split names.  Check if path is just "/" to avoid
 498          an empty path.  */
 499       if (libname == path)
 500         {
 501           libname = library + 1;
 502           path = xrealloc (path, 2);
 503           strcpy (path, "/");
 504         }
 505       else
 506         {
 507           *libname = '\0';
 508           ++libname;
 509         }
 510     }
 511   else
 512     {
 513       /* There's no path, construct one. */
 514       libname = library;
 515       path = xrealloc (path, 2);
 516       strcpy (path, ".");
 517     }
 518
 519   if (opt_chroot)
 520     {
 521       real_path = chroot_canon (opt_chroot, path);
 522       if (real_path == NULL)
 523         {
 524           error (0, errno, _("Can't find %s"), path);
 525           free (path);
 526           return;
 527         }
 528       real_library = alloca (strlen (real_path) + strlen (libname) + 2);
 529       sprintf (real_library, "%s/%s", real_path, libname);
 530     }
 531   else
 532     {
 533       real_path = path;
 534       real_library = library;
 535     }
 536
 537   /* Do some sanity checks first.  */
 538   if (lstat64 (real_library, &stat_buf))
 539     {
 540       error (0, errno, _("Can't lstat %s"), library);
 541       free (path);
 542       return;
 543     }
 544   /* We don't want links here!  */
 545   else if (!S_ISREG (stat_buf.st_mode))
 546     {
 547       error (0, 0, _("Ignored file %s since it is not a regular file."),
 548              library);
 549       free (path);
 550       return;
 551     }
 552   if (process_file (real_library, library, libname, &flag, &osversion,
 553                     &soname, 0))
 554     {
 555       error (0, 0, _("No link created since soname could not be found for %s"),
 556              library);
 557       free (path);
 558       return;
 559     }
 560   create_links (real_path, path, libname, soname);
 561   free (soname);
 562   free (path);
 563 }
 564
 565
 566 /* Read a whole directory and search for libraries.
 567    The purpose is two-fold:
 568    - search for libraries which will be added to the cache
 569    - create symbolic links to the soname for each library
 570
 571    This has to be done separatly for each directory.
 572
 573    To keep track of which libraries to add to the cache and which
 574    links to create, we save a list of all libraries.
 575
 576    The algorithm is basically:
 577    for all libraries in the directory do
 578      get soname of library
 579      if soname is already in list
 580        if new library is newer, replace entry
 581        otherwise ignore this library
 582      otherwise add library to list
 583
 584    For example, if the two libraries libxy.so.1.1 and libxy.so.1.2
 585    exist and both have the same soname, e.g. libxy.so, a symbolic link
 586    is created from libxy.so.1.2 (the newer one) to libxy.so.
 587    libxy.so.1.2 and libxy.so are added to the cache - but not
 588    libxy.so.1.1.  */
 589
 590 /* Information for one library.  */
 591 struct dlib_entry
 592 {
 593   char *name;
 594   char *soname;
 595   int flag;
 596   int is_link;
 597   unsigned int osversion;
 598   struct dlib_entry *next;
 599 };
 600
 601
 602 static void
 603 search_dir (const struct dir_entry *entry)
 604 {
 605   DIR *dir;
 606   struct dirent *direntry;
 607   char *file_name, *dir_name, *real_file_name, *real_name;
 608   int file_name_len, real_file_name_len, len;
 609   char *soname;
 610   struct dlib_entry *dlibs;
 611   struct dlib_entry *dlib_ptr;
 612   struct stat64 lstat_buf, stat_buf;
 613   int is_link, is_dir;
 614   uint64_t hwcap = path_hwcap (entry->path);
 615   unsigned int osversion;
 616
 617   file_name_len = PATH_MAX;
 618   file_name = alloca (file_name_len);
 619
 620   dlibs = NULL;
 621
 622   if (opt_verbose)
 623     {
 624       if (hwcap != 0)
 625         printf ("%s: (hwcap: 0x%" PRIx64 ")\n", entry->path, hwcap);
 626       else
 627         printf ("%s:\n", entry->path);
 628     }
 629
 630   if (opt_chroot)
 631     {
 632       dir_name = chroot_canon (opt_chroot, entry->path);
 633       real_file_name_len = PATH_MAX;
 634       real_file_name = alloca (real_file_name_len);
 635     }
 636   else
 637     {
 638       dir_name = entry->path;
 639       real_file_name_len = 0;
 640       real_file_name = file_name;
 641     }
 642
 643   if (dir_name == NULL || (dir = opendir (dir_name)) == NULL)
 644     {
 645       if (opt_verbose)
 646         error (0, errno, _("Can't open directory %s"), entry->path);
 647       if (opt_chroot && dir_name)
 648         free (dir_name);
 649       return;
 650     }
 651
 652   while ((direntry = readdir (dir)) != NULL)
 653     {
 654       int flag;
 655 #ifdef _DIRENT_HAVE_D_TYPE
 656       /* We only look at links and regular files.  */
 657       if (direntry->d_type != DT_UNKNOWN
 658           && direntry->d_type != DT_LNK
 659           && direntry->d_type != DT_REG
 660           && direntry->d_type != DT_DIR)
 661         continue;
 662 #endif /* _DIRENT_HAVE_D_TYPE  */
 663       /* Does this file look like a shared library or is it a hwcap
 664          subdirectory?  The dynamic linker is also considered as
 665          shared library.  */
 666       if (((strncmp (direntry->d_name, "lib", 3) != 0
 667             && strncmp (direntry->d_name, "ld-", 3) != 0)
 668            || strstr (direntry->d_name, ".so") == NULL)
 669           && (
 670 #ifdef _DIRENT_HAVE_D_TYPE
 671               direntry->d_type == DT_REG ||
 672 #endif
 673               !is_hwcap_platform (direntry->d_name)))
 674         continue;
 675       len = strlen (entry->path) + strlen (direntry->d_name);
 676       if (len > file_name_len)
 677         {
 678           file_name_len = len + 1;
 679           file_name = alloca (file_name_len);
 680           if (!opt_chroot)
 681             real_file_name = file_name;
 682         }
 683       sprintf (file_name, "%s/%s", entry->path, direntry->d_name);
 684       if (opt_chroot)
 685         {
 686           len = strlen (dir_name) + strlen (direntry->d_name);
 687           if (len > real_file_name_len)
 688             {
 689               real_file_name_len = len + 1;
 690               real_file_name = alloca (real_file_name_len);
 691             }
 692           sprintf (real_file_name, "%s/%s", dir_name, direntry->d_name);
 693         }
 694 #ifdef _DIRENT_HAVE_D_TYPE
 695       if (direntry->d_type != DT_UNKNOWN)
 696         lstat_buf.st_mode = DTTOIF (direntry->d_type);
 697       else
 698 #endif
 699         if (__builtin_expect (lstat64 (real_file_name, &lstat_buf), 0))
 700           {
 701             error (0, errno, _("Cannot lstat %s"), file_name);
 702             continue;
 703           }
 704
 705       is_link = S_ISLNK (lstat_buf.st_mode);
 706       if (is_link)
 707         {
 708           /* In case of symlink, we check if the symlink refers to
 709              a directory. */
 710           if (__builtin_expect (stat64 (real_file_name, &stat_buf), 0))
 711             {
 712               if (opt_verbose)
 713                 error (0, errno, _("Cannot stat %s"), file_name);
 714
 715               /* Remove stale symlinks.  */
 716               if (strstr (direntry->d_name, ".so."))
 717                 unlink (real_file_name);
 718               continue;
 719             }
 720           is_dir = S_ISDIR (stat_buf.st_mode);
 721         }
 722       else
 723         is_dir = S_ISDIR (lstat_buf.st_mode);
 724
 725       if (is_dir && is_hwcap_platform (direntry->d_name))
 726         {
 727           /* Handle subdirectory later.  */
 728           struct dir_entry *new_entry;
 729
 730           new_entry = xmalloc (sizeof (struct dir_entry));
 731           new_entry->path = xstrdup (file_name);
 732           new_entry->flag = entry->flag;
 733           new_entry->next = NULL;
 734           if (is_link)
 735             {
 736               new_entry->ino = stat_buf.st_ino;
 737               new_entry->dev = stat_buf.st_dev;
 738             }
 739           else
 740             {
 741 #ifdef _DIRENT_HAVE_D_TYPE
 742               /* We have filled in lstat only #ifndef
 743                  _DIRENT_HAVE_D_TYPE.  Fill it in if needed.  */
 744               if (direntry->d_type != DT_UNKNOWN
 745                   && __builtin_expect (lstat64 (real_file_name, &lstat_buf),
 746                                        0))
 747                 {
 748                   error (0, errno, _("Cannot lstat %s"), file_name);
 749                   free (new_entry->path);
 750                   free (new_entry);
 751                   continue;
 752                 }
 753 #endif
 754
 755               new_entry->ino = lstat_buf.st_ino;
 756               new_entry->dev = lstat_buf.st_dev;
 757             }
 758           add_single_dir (new_entry, 0);
 759           continue;
 760         }
 761       else if (!S_ISREG (lstat_buf.st_mode) && !is_link)
 762         continue;
 763
 764       if (opt_chroot && is_link)
 765         {
 766           real_name = chroot_canon (opt_chroot, file_name);
 767           if (real_name == NULL)
 768             {
 769               if (strstr (file_name, ".so") == NULL)
 770                 error (0, 0, _("Input file %s not found.\n"), file_name);
 771               continue;
 772             }
 773         }
 774       else
 775         real_name = real_file_name;
 776
 777       if (process_file (real_name, file_name, direntry->d_name, &flag,
 778                         &osversion, &soname, is_link))
 779         {
 780           if (real_name != real_file_name)
 781             free (real_name);
 782           continue;
 783         }
 784
 785       if (real_name != real_file_name)
 786         free (real_name);
 787
 788       /* Links will just point to itself.  */
 789       if (is_link)
 790         {
 791           free (soname);
 792           soname = xstrdup (direntry->d_name);
 793         }
 794
 795       if (flag == FLAG_ELF
 796           && (entry->flag == FLAG_ELF_LIBC5
 797               || entry->flag == FLAG_ELF_LIBC6))
 798         flag = entry->flag;
 799       /* Some sanity checks to print warnings.  */
 800       if (opt_verbose)
 801         {
 802           if (flag == FLAG_ELF_LIBC5 && entry->flag != FLAG_ELF_LIBC5
 803               && entry->flag != FLAG_ANY)
 804             error (0, 0, _("libc5 library %s in wrong directory"), file_name);
 805           if (flag == FLAG_ELF_LIBC6 && entry->flag != FLAG_ELF_LIBC6
 806               && entry->flag != FLAG_ANY)
 807             error (0, 0, _("libc6 library %s in wrong directory"), file_name);
 808           if (flag == FLAG_LIBC4 && entry->flag != FLAG_LIBC4
 809               && entry->flag != FLAG_ANY)
 810             error (0, 0, _("libc4 library %s in wrong directory"), file_name);
 811         }
 812
 813       /* Add library to list.  */
 814       for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
 815         {
 816           /* Is soname already in list?  */
 817           if (strcmp (dlib_ptr->soname, soname) == 0)
 818             {
 819               /* Prefer a file to a link, otherwise check which one
 820                  is newer.  */
 821               if ((!is_link && dlib_ptr->is_link)
 822                   || (is_link == dlib_ptr->is_link
 823                       && _dl_cache_libcmp (dlib_ptr->name, direntry->d_name) < 0))
 824                 {
 825                   /* It's newer - add it.  */
 826                   /* Flag should be the same - sanity check.  */
 827                   if (dlib_ptr->flag != flag)
 828                     {
 829                       if (dlib_ptr->flag == FLAG_ELF
 830                           && (flag == FLAG_ELF_LIBC5 || flag == FLAG_ELF_LIBC6))
 831                         dlib_ptr->flag = flag;
 832                       else if ((dlib_ptr->flag == FLAG_ELF_LIBC5
 833                                 || dlib_ptr->flag == FLAG_ELF_LIBC6)
 834                                && flag == FLAG_ELF)
 835                         dlib_ptr->flag = flag;
 836                       else
 837                         error (0, 0, _("libraries %s and %s in directory %s have same soname but different type."),
 838                                dlib_ptr->name, direntry->d_name, entry->path);
 839                     }
 840                   free (dlib_ptr->name);
 841                   dlib_ptr->osversion = osversion;
 842                   dlib_ptr->name = xstrdup (direntry->d_name);
 843                   dlib_ptr->is_link = is_link;
 844                 }
 845               /* Don't add this library, abort loop.  */
 846               /* Also free soname, since it's dynamically allocated.  */
 847               free (soname);
 848               break;
 849             }
 850         }
 851       /* Add the library if it's not already in.  */
 852       if (dlib_ptr == NULL)
 853         {
 854           dlib_ptr = (struct dlib_entry *)xmalloc (sizeof (struct dlib_entry));
 855           dlib_ptr->name = xstrdup (direntry->d_name);
 856           dlib_ptr->flag = flag;
 857           dlib_ptr->osversion = osversion;
 858           dlib_ptr->soname = soname;
 859           dlib_ptr->is_link = is_link;
 860           /* Add at head of list.  */
 861           dlib_ptr->next = dlibs;
 862           dlibs = dlib_ptr;
 863         }
 864     }
 865
 866   closedir (dir);
 867
 868   /* Now dlibs contains a list of all libs - add those to the cache
 869      and created all symbolic links.  */
 870   for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
 871     {
 872       /* Don't create links to links.  */
 873       if (dlib_ptr->is_link == 0)
 874         create_links (dir_name, entry->path, dlib_ptr->name,
 875                       dlib_ptr->soname);
 876       if (opt_build_cache)
 877         add_to_cache (entry->path, dlib_ptr->soname, dlib_ptr->flag,
 878                       dlib_ptr->osversion, hwcap);
 879     }
 880
 881   /* Free all resources.  */
 882   while (dlibs)
 883     {
 884       dlib_ptr = dlibs;
 885       free (dlib_ptr->soname);
 886       free (dlib_ptr->name);
 887       dlibs = dlibs->next;
 888       free (dlib_ptr);
 889     }
 890
 891   if (opt_chroot && dir_name)
 892     free (dir_name);
 893 }
 894
 895 /* Search through all libraries.  */
 896 static void
 897 search_dirs (void)
 898 {
 899   struct dir_entry *entry;
 900
 901   for (entry = dir_entries; entry != NULL; entry = entry->next)
 902     search_dir (entry);
 903
 904   /* Free all allocated memory.  */
 905   while (dir_entries)
 906     {
 907       entry = dir_entries;
 908       dir_entries = dir_entries->next;
 909       free (entry->path);
 910       free (entry);
 911     }
 912 }
 913
 914
 915 /* Parse configuration file.  */
 916 static void
 917 parse_conf (const char *filename)
 918 {
 919   FILE *file = NULL;
 920   char *line = NULL;
 921   const char *canon;
 922   size_t len = 0;
 923
 924   if (opt_chroot)
 925     {
 926       canon = chroot_canon (opt_chroot, filename);
 927       if (canon)
 928         file = fopen (canon, "r");
 929       else
 930         canon = filename;
 931     }
 932   else
 933     {
 934       canon = filename;
 935       file = fopen (filename, "r");
 936     }
 937
 938   if (file == NULL)
 939     {
 940       error (0, errno, _("Can't open configuration file %s"), canon);
 941       if (canon != filename)
 942         free ((char *) canon);
 943       return;
 944     }
 945
 946   /* No threads use this stream.  */
 947   __fsetlocking (file, FSETLOCKING_BYCALLER);
 948
 949   if (canon != filename)
 950     free ((char *) canon);
 951
 952   do
 953     {
 954       ssize_t n = getline (&line, &len, file);
 955       if (n < 0)
 956         break;
 957
 958       if (line[n - 1] == '\n')
 959         line[n - 1] = '\0';
 960
 961       /* Because the file format does not know any form of quoting we
 962          can search forward for the next '#' character and if found
 963          make it terminating the line.  */
 964       *strchrnul (line, '#') = '\0';
 965
 966       /* If the line is blank it is ignored.  */
 967       if (line[0] == '\0')
 968         continue;
 969
 970       add_dir (line);
 971     } while (!feof (file));
 972
 973   /* Free buffer and close file.  */
 974   free (line);
 975   fclose (file);
 976 }
 977
 978 /* Honour LD_HWCAP_MASK.  */
 979 static void
 980 set_hwcap (void)
 981 {
 982   char *mask = getenv ("LD_HWCAP_MASK");
 983
 984   if (mask)
 985     hwcap_mask = strtoul (mask, NULL, 0);
 986 }
 987
 988
 989 int
 990 main (int argc, char **argv)
 991 {
 992   int remaining;
 993
 994   /* Parse and process arguments.  */
 995   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
 996
 997   /* Remaining arguments are additional libraries if opt_manual_link
 998      is not set.  */
 999   if (remaining != argc && !opt_manual_link)
1000     {
1001       int i;
1002       for (i = remaining; i < argc; ++i)
1003         add_dir (argv[i]);
1004     }
1005
1006   set_hwcap ();
1007
1008   if (opt_chroot)
1009     {
1010       /* Normalize the path a bit, we might need it for printing later.  */
1011       char *endp = strchr (opt_chroot, '\0');
1012       while (endp > opt_chroot && endp[-1] == '/')
1013         --endp;
1014       *endp = '\0';
1015       if (endp == opt_chroot)
1016         opt_chroot = NULL;
1017
1018       if (opt_chroot)
1019         {
1020           /* It is faster to use chroot if we can.  */
1021           if (!chroot (opt_chroot))
1022             {
1023               if (chdir ("/"))
1024                 error (EXIT_FAILURE, errno, _("Can't chdir to /"));
1025               opt_chroot = NULL;
1026             }
1027         }
1028     }
1029
1030   if (cache_file == NULL)
1031     {
1032       cache_file = alloca (strlen (LD_SO_CACHE) + 1);
1033       strcpy (cache_file, LD_SO_CACHE);
1034     }
1035
1036   if (config_file == NULL)
1037     config_file = LD_SO_CONF;
1038
1039   if (opt_print_cache)
1040     {
1041       if (opt_chroot)
1042         {
1043           char *p = chroot_canon (opt_chroot, cache_file);
1044           if (p == NULL)
1045             error (EXIT_FAILURE, errno, _("Can't open cache file %s\n"),
1046                    cache_file);
1047           cache_file = p;
1048         }
1049       print_cache (cache_file);
1050       if (opt_chroot)
1051         free (cache_file);
1052       exit (0);
1053     }
1054
1055   if (opt_chroot)
1056     {
1057       /* Canonicalize the directory name of cache_file, not cache_file,
1058          because we'll rename a temporary cache file to it.  */
1059       char *p = strrchr (cache_file, '/');
1060       char *canon = chroot_canon (opt_chroot,
1061                                   p ? (*p = '\0', cache_file) : "/");
1062
1063       if (canon == NULL)
1064         {
1065           error (EXIT_FAILURE, errno,
1066                  _("Can't open cache file directory %s\n"),
1067                  p ? cache_file : "/");
1068         }
1069
1070       if (p)
1071         ++p;
1072       else
1073         p = cache_file;
1074
1075       cache_file = alloca (strlen (canon) + strlen (p) + 2);
1076       sprintf (cache_file, "%s/%s", canon, p);
1077       free (canon);
1078     }
1079
1080   if (opt_manual_link)
1081     {
1082       /* Link all given libraries manually.  */
1083       int i;
1084
1085       for (i = remaining; i < argc; ++i)
1086         manual_link (argv[i]);
1087
1088       exit (0);
1089     }
1090
1091
1092   if (opt_build_cache)
1093     init_cache ();
1094
1095   if (!opt_only_cline)
1096     {
1097       /* Always add the standard search paths.  */
1098       add_dir (SLIBDIR);
1099       if (strcmp (SLIBDIR, LIBDIR))
1100         add_dir (LIBDIR);
1101
1102       parse_conf (config_file);
1103     }
1104
1105   search_dirs ();
1106
1107   if (opt_build_cache)
1108     save_cache (cache_file);
1109
1110   return 0;
1111 }