/* Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Andreas Jaeger <aj@suse.de>, 1999.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published

   by the Free Software Foundation; version 2 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#define PROCINFO_CLASS static

#include <assert.h>

#include <alloca.h>

#include <argp.h>

#include <dirent.h>

#include <elf.h>

#include <error.h>

#include <errno.h>

#include <inttypes.h>

#include <libintl.h>

#include <locale.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdio_ext.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <stdint.h>

#include <sys/fcntl.h>

#include <sys/mman.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <glob.h>

#include <libgen.h>

#include <ldconfig.h>

#include <dl-cache.h>

#include <dl-hwcaps.h>

#include <dl-procinfo.h>

/* This subpath in search path entries is always supported and

   included in the cache for backwards compatibility.  */

#define TLS_SUBPATH "tls"

/* The MSB of the hwcap field is set for objects in TLS_SUBPATH

   directories.  There is always TLS support in glibc, so the dynamic

   loader does not check the bit directly.  But more hwcap bits make a

   an object more preferred, so the bit still has meaning.  */

#define TLS_HWCAP_BIT 63

#ifndef LD_SO_CONF

# define LD_SO_CONF SYSCONFDIR "/ld.so.conf"

#endif

/* Get libc version number.  */

#include <version.h>

#define PACKAGE _libc_intl_domainname

static const struct

{

  const char *name;

  int flag;

} lib_types[] =

{

  {"libc4", FLAG_LIBC4},

  {"libc5", FLAG_ELF_LIBC5},

  {"libc6", FLAG_ELF_LIBC6},

  {"glibc2", FLAG_ELF_LIBC6}

};

/* List of directories to handle.  */

struct dir_entry

{

  char *path;

  int flag;

  ino64_t ino;

  dev_t dev;

  const char *from_file;

  int from_line;

  /* Non-NULL for subdirectories under a glibc-hwcaps subdirectory.  */

  struct glibc_hwcaps_subdirectory *hwcaps;

  struct dir_entry *next;

};

/* The list is unsorted, contains no duplicates.  Entries are added at

   the end.  */

static struct dir_entry *dir_entries;

/* Flags for different options.  */

/* Print Cache.  */

static int opt_print_cache;

/* Be verbose.  */

int opt_verbose;

/* Format to support.  */

enum opt_format opt_format = opt_format_new;

/* Build cache.  */

static int opt_build_cache = 1;

/* Enable symbolic link processing.  If set, create or update symbolic

   links, and remove stale symbolic links.  */

static int opt_link = 1;

/* Only process directories specified on the command line.  */

static int opt_only_cline;

/* Path to root for chroot.  */

static char *opt_chroot;

/* Manually link given shared libraries.  */

static int opt_manual_link;

/* Should we ignore an old auxiliary cache file?  */

static int opt_ignore_aux_cache;

/* Cache file to use.  */

static char *cache_file;

/* Configuration file.  */

static const char *config_file;

/* Mask to use for important hardware capabilities.  */

static unsigned long int hwcap_mask = HWCAP_IMPORTANT;

/* Name and version of program.  */

static void print_version (FILE *stream, struct argp_state *state);

void (*argp_program_version_hook) (FILE *, struct argp_state *)

     = print_version;

/* Function to print some extra text in the help message.  */

static char *more_help (int key, const char *text, void *input);

/* Definitions of arguments for argp functions.  */

static const struct argp_option options[] =

{

  { "print-cache", 'p', NULL, 0, N_("Print cache"), 0},

  { "verbose", 'v', NULL, 0, N_("Generate verbose messages"), 0},

  { NULL, 'N', NULL, 0, N_("Don't build cache"), 0},

  { NULL, 'X', NULL, 0, N_("Don't update symbolic links"), 0},

  { NULL, 'r', N_("ROOT"), 0, N_("Change to and use ROOT as root directory"), 0},

  { NULL, 'C', N_("CACHE"), 0, N_("Use CACHE as cache file"), 0},

  { NULL, 'f', N_("CONF"), 0, N_("Use CONF as configuration file"), 0},

  { NULL, 'n', NULL, 0, N_("Only process directories specified on the command line.  Don't build cache."), 0},

  { NULL, 'l', NULL, 0, N_("Manually link individual libraries."), 0},

  { "format", 'c', N_("FORMAT"), 0, N_("Format to use: new (default), old, or compat"), 0},

  { "ignore-aux-cache", 'i', NULL, 0, N_("Ignore auxiliary cache file"), 0},

  { NULL, 0, NULL, 0, NULL, 0 }

};

#define PROCINFO_CLASS static

#include <dl-procinfo.c>

/* Short description of program.  */

static const char doc[] = N_("Configure Dynamic Linker Run Time Bindings.");

/* Prototype for option handler.  */

static error_t parse_opt (int key, char *arg, struct argp_state *state);

/* Data structure to communicate with argp functions.  */

static struct argp argp =

{

  options, parse_opt, NULL, doc, NULL, more_help, NULL

};

/* Check if string corresponds to an important hardware capability or

   a platform.  */

static int

is_hwcap_platform (const char *name)

{

  int hwcap_idx = _dl_string_hwcap (name);

  /* Is this a normal hwcap for the machine like "fpu?"  */

  if (hwcap_idx != -1 && ((1 << hwcap_idx) & hwcap_mask))

    return 1;

  /* Is this a platform pseudo-hwcap like "i686?"  */

  hwcap_idx = _dl_string_platform (name);

  if (hwcap_idx != -1)

    return 1;

  /* Backwards-compatibility for the "tls" subdirectory.  */

  if (strcmp (name, TLS_SUBPATH) == 0)

    return 1;

  return 0;

}

/* Get hwcap (including platform) encoding of path.  */

static uint64_t

path_hwcap (const char *path)

{

  char *str = xstrdup (path);

  char *ptr;

  uint64_t hwcap = 0;

  uint64_t h;

  size_t len;

  len = strlen (str);

  if (str[len] == '/')

    str[len] = '\0';

  /* Search pathname from the end and check for hwcap strings.  */

  for (;;)

    {

      ptr = strrchr (str, '/');

      if (ptr == NULL)

	break;

      h = _dl_string_hwcap (ptr + 1);

      if (h == (uint64_t) -1)

	{

	  h = _dl_string_platform (ptr + 1);

	  if (h == (uint64_t) -1)

	    {

	      if (strcmp (ptr + 1, TLS_SUBPATH) == 0)

		h = TLS_HWCAP_BIT;

	      else

		break;

	    }

	}

      hwcap += 1ULL << h;

      /* Search the next part of the path.  */

      *ptr = '\0';

    }

  free (str);

  return hwcap;

}

/* Handle program arguments.  */

static error_t

parse_opt (int key, char *arg, struct argp_state *state)

{

  switch (key)

    {

    case 'C':

      cache_file = arg;

      /* Ignore auxiliary cache since we use non-standard cache.  */

      opt_ignore_aux_cache = 1;

      break;

    case 'f':

      config_file = arg;

      break;

    case 'i':

      opt_ignore_aux_cache = 1;

      break;

    case 'l':

      opt_manual_link = 1;

      break;

    case 'N':

      opt_build_cache = 0;

      break;

    case 'n':

      opt_build_cache = 0;

      opt_only_cline = 1;

      break;

    case 'p':

      opt_print_cache = 1;

      break;

    case 'r':

      opt_chroot = arg;

      break;

    case 'v':

      opt_verbose = 1;

      break;

    case 'X':

      opt_link = 0;

      break;

    case 'c':

      if (strcmp (arg, "old") == 0)

	opt_format = opt_format_old;

      else if (strcmp (arg, "compat") == 0)

	opt_format = opt_format_compat;

      else if (strcmp (arg, "new") == 0)

	opt_format = opt_format_new;

      break;

    default:

      return ARGP_ERR_UNKNOWN;

    }

  return 0;

}

/* Print bug-reporting information in the help message.  */

static char *

more_help (int key, const char *text, void *input)

{

  char *tp = NULL;

  switch (key)

    {

    case ARGP_KEY_HELP_EXTRA:

      /* We print some extra information.  */

      if (asprintf (&tp, gettext ("\

For bug reporting instructions, please see:\n\

%s.\n"), REPORT_BUGS_TO) < 0)

	return NULL;

      return tp;

    default:

      break;

    }

  return (char *) text;

}

/* Print the version information.  */

static void

print_version (FILE *stream, struct argp_state *state)

{

  fprintf (stream, "ldconfig %s%s\n", PKGVERSION, VERSION);

  fprintf (stream, gettext ("\

Copyright (C) %s Free Software Foundation, Inc.\n\

This is free software; see the source for copying conditions.  There is NO\n\

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\

"), "2018");

  fprintf (stream, gettext ("Written by %s.\n"),

	   "Andreas Jaeger");

}

/* Allocate a new subdirectory with full path PATH under ENTRY, using

   inode data from *ST.  */

static struct dir_entry *

new_sub_entry (const struct dir_entry *entry, const char *path,

	       const struct stat64 *st)

{

  struct dir_entry *new_entry = xmalloc (sizeof (struct dir_entry));

  new_entry->from_file = entry->from_file;

  new_entry->from_line = entry->from_line;

  new_entry->path = xstrdup (path);

  new_entry->flag = entry->flag;

  new_entry->hwcaps = NULL;

  new_entry->next = NULL;

  new_entry->ino = st->st_ino;

  new_entry->dev = st->st_dev;

  return new_entry;

}

/* Add a single directory entry.  Return true if the directory is

   actually added (because it is not a duplicate).  */

static bool

add_single_dir (struct dir_entry *entry, int verbose)

{

  struct dir_entry *ptr, *prev;

  bool added = true;

  ptr = dir_entries;

  prev = ptr;

  while (ptr != NULL)

    {

      /* Check for duplicates.  */

      if (ptr->ino == entry->ino && ptr->dev == entry->dev)

	{

	  if (opt_verbose && verbose)

	    {

	      error (0, 0, _("Path `%s' given more than once"), entry->path);

	      fprintf (stderr, _("(from %s:%d and %s:%d)\n"),

		       entry->from_file, entry->from_line,

		       ptr->from_file, ptr->from_line);

	    }

	  /* Use the newer information.  */

	  ptr->flag = entry->flag;

	  free (entry->path);

	  free (entry);

	  added = false;

	  break;

	}

      prev = ptr;

      ptr = ptr->next;

    }

  /* Is this the first entry?  */

  if (ptr == NULL && dir_entries == NULL)

    dir_entries = entry;

  else if (ptr == NULL)

    prev->next = entry;

  return added;

}

/* Check if PATH contains a "glibc-hwcaps" subdirectory.  If so, queue

   its subdirectories for glibc-hwcaps processing.  */

static void

add_glibc_hwcaps_subdirectories (struct dir_entry *entry, const char *path)

{

  /* glibc-hwcaps subdirectories do not nest.  */

  assert (entry->hwcaps == NULL);

  char *glibc_hwcaps;

  if (asprintf (&glibc_hwcaps, "%s/" GLIBC_HWCAPS_SUBDIRECTORY, path) < 0)

    error (EXIT_FAILURE, errno, _("Could not form glibc-hwcaps path"));

  DIR *dir = opendir (glibc_hwcaps);

  if (dir != NULL)

    {

      while (true)

	{

	  errno = 0;

	  struct dirent64 *e = readdir64 (dir);

	  if (e == NULL)

	    {

	      if (errno == 0)

		break;

	      else

		error (EXIT_FAILURE, errno, _("Listing directory %s"), path);

	    }

	  /* Ignore hidden subdirectories, including "." and "..", and

	     regular files.  File names containing a ':' cannot be

	     looked up by the dynamic loader, so skip those as

	     well.  */

	  if (e->d_name[0] == '.' || e->d_type == DT_REG

	      || strchr (e->d_name, ':') != NULL)

	    continue;

	  /* See if this entry eventually resolves to a directory.  */

	  struct stat64 st;

	  if (fstatat64 (dirfd (dir), e->d_name, &st, 0) < 0)

	    /* Ignore unreadable entries.  */

	    continue;

	  if (S_ISDIR (st.st_mode))

	    {

	      /* This is a directory, so it needs to be scanned for

		 libraries, associated with the hwcaps implied by the

		 subdirectory name.  */

	      char *new_path;

	      if (asprintf (&new_path, "%s/" GLIBC_HWCAPS_SUBDIRECTORY "/%s",

			    /* Use non-canonicalized path here.  */

			    entry->path, e->d_name) < 0)

		error (EXIT_FAILURE, errno,

		       _("Could not form glibc-hwcaps path"));

	      struct dir_entry *new_entry = new_sub_entry (entry, new_path,

							   &st);

	      free (new_path);

	      new_entry->hwcaps = new_glibc_hwcaps_subdirectory (e->d_name);

	      add_single_dir (new_entry, 0);

	    }

	}

      closedir (dir);

    }

  free (glibc_hwcaps);

}

/* Add one directory to the list of directories to process.  */

static void

add_dir_1 (const char *line, const char *from_file, int from_line)

{

  unsigned int i;

  struct dir_entry *entry = xmalloc (sizeof (struct dir_entry));

  entry->hwcaps = NULL;

  entry->next = NULL;

  entry->from_file = strdup (from_file);

  entry->from_line = from_line;

  /* Search for an '=' sign.  */

  entry->path = xstrdup (line);

  char *equal_sign = strchr (entry->path, '=');

  if (equal_sign)

    {

      *equal_sign = '\0';

      ++equal_sign;

      entry->flag = FLAG_ANY;

      for (i = 0; i < sizeof (lib_types) / sizeof (lib_types[0]); ++i)

	if (strcmp (equal_sign, lib_types[i].name) == 0)

	  {

	    entry->flag = lib_types[i].flag;

	    break;

	  }

      if (entry->flag == FLAG_ANY)

	error (0, 0, _("%s is not a known library type"), equal_sign);

    }

  else

    {

      entry->flag = FLAG_ANY;

    }

  /* Canonify path: for now only remove leading and trailing

     whitespace and the trailing slashes.  */

  i = strlen (entry->path);

  while (i > 0 && isspace (entry->path[i - 1]))

    entry->path[--i] = '\0';

  while (i > 0 && entry->path[i - 1] == '/')

    entry->path[--i] = '\0';

  if (i == 0)

    return;

  char *path = entry->path;

  if (opt_chroot)

    path = chroot_canon (opt_chroot, path);

  struct stat64 stat_buf;

  if (path == NULL || stat64 (path, &stat_buf))

    {

      if (opt_verbose)

	error (0, errno, _("Can't stat %s"), entry->path);

      free (entry->path);

      free (entry);

    }

  else

    {

      entry->ino = stat_buf.st_ino;

      entry->dev = stat_buf.st_dev;

      if (add_single_dir (entry, 1))

	/* Add glibc-hwcaps subdirectories if present.  */

	add_glibc_hwcaps_subdirectories (entry, path);

    }

  if (opt_chroot)

    free (path);

}

static void

add_dir (const char *line)

{

  add_dir_1 (line, "<builtin>", 0);

}

static int

chroot_stat (const char *real_path, const char *path, struct stat64 *st)

{

  int ret;

  char *canon_path;

  if (!opt_chroot)

    return stat64 (real_path, st);

  ret = lstat64 (real_path, st);

  if (ret || !S_ISLNK (st->st_mode))

    return ret;

  canon_path = chroot_canon (opt_chroot, path);

  if (canon_path == NULL)

    return -1;

  ret = stat64 (canon_path, st);

  free (canon_path);

  return ret;

}

/* Create a symbolic link from soname to libname in directory path.  */

static void

create_links (const char *real_path, const char *path, const char *libname,

	      const char *soname)

{

  char *full_libname, *full_soname;

  char *real_full_libname, *real_full_soname;

  struct stat64 stat_lib, stat_so, lstat_so;

  int do_link = 1;

  int do_remove = 1;

  /* XXX: The logics in this function should be simplified.  */

  /* Get complete path.  */

  full_libname = alloca (strlen (path) + strlen (libname) + 2);

  full_soname = alloca (strlen (path) + strlen (soname) + 2);

  sprintf (full_libname, "%s/%s", path, libname);

  sprintf (full_soname, "%s/%s", path, soname);

  if (opt_chroot)

    {

      real_full_libname = alloca (strlen (real_path) + strlen (libname) + 2);

      real_full_soname = alloca (strlen (real_path) + strlen (soname) + 2);

      sprintf (real_full_libname, "%s/%s", real_path, libname);

      sprintf (real_full_soname, "%s/%s", real_path, soname);

    }

  else

    {

      real_full_libname = full_libname;

      real_full_soname = full_soname;

    }

  /* Does soname already exist and point to the right library?  */

  if (chroot_stat (real_full_soname, full_soname, &stat_so) == 0)

    {

      if (chroot_stat (real_full_libname, full_libname, &stat_lib))

	{

	  error (0, 0, _("Can't stat %s\n"), full_libname);

	  return;

	}

      if (stat_lib.st_dev == stat_so.st_dev

	  && stat_lib.st_ino == stat_so.st_ino)

	/* Link is already correct.  */

	do_link = 0;

      else if (lstat64 (full_soname, &lstat_so) == 0

	       && !S_ISLNK (lstat_so.st_mode))

	{

	  error (0, 0, _("%s is not a symbolic link\n"), full_soname);

	  do_link = 0;

	  do_remove = 0;

	}

    }

  else if (lstat64 (real_full_soname, &lstat_so) != 0

	   || !S_ISLNK (lstat_so.st_mode))

    /* Unless it is a stale symlink, there is no need to remove.  */

    do_remove = 0;

  if (opt_verbose)

    printf ("\t%s -> %s", soname, libname);

  if (do_link && opt_link)

    {

      /* Remove old link.  */

      if (do_remove)

	if (unlink (real_full_soname))

	  {

	    error (0, 0, _("Can't unlink %s"), full_soname);

	    do_link = 0;

	  }

      /* Create symbolic link.  */

      if (do_link && symlink (libname, real_full_soname))

	{

	  error (0, 0, _("Can't link %s to %s"), full_soname, libname);

	  do_link = 0;

	}

      if (opt_verbose)

	{

	  if (do_link)

	    fputs (_(" (changed)\n"), stdout);

	  else

	    fputs (_(" (SKIPPED)\n"), stdout);

	}

    }

  else if (opt_verbose)

    fputs ("\n", stdout);

}

/* Manually link the given library.  */

static void

manual_link (char *library)

{

  char *path;

  char *real_path;

  char *real_library;

  char *libname;

  char *soname;

  struct stat64 stat_buf;

  int flag;

  unsigned int osversion;

  /* Prepare arguments for create_links call.  Split library name in

     directory and filename first.  Since path is allocated, we've got

     to be careful to free at the end.  */

  path = xstrdup (library);

  libname = strrchr (path, '/');

  if (libname)

    {

      /* Successfully split names.  Check if path is just "/" to avoid

	 an empty path.  */

      if (libname == path)

	{

	  libname = library + 1;

	  path = xrealloc (path, 2);

	  strcpy (path, "/");

	}

      else

	{

	  *libname = '\0';

	  ++libname;

	}

    }

  else

    {

      /* There's no path, construct one. */

      libname = library;

      path = xrealloc (path, 2);

      strcpy (path, ".");

    }

  if (opt_chroot)

    {

      real_path = chroot_canon (opt_chroot, path);

      if (real_path == NULL)

	{

	  error (0, errno, _("Can't find %s"), path);

	  free (path);

	  return;

	}

      real_library = alloca (strlen (real_path) + strlen (libname) + 2);

      sprintf (real_library, "%s/%s", real_path, libname);

    }

  else

    {

      real_path = path;

      real_library = library;

    }

  /* Do some sanity checks first.  */

  if (lstat64 (real_library, &stat_buf))

    {

      error (0, errno, _("Cannot lstat %s"), library);

      free (path);

      return;

    }

  /* We don't want links here!  */

  else if (!S_ISREG (stat_buf.st_mode))

    {

      error (0, 0, _("Ignored file %s since it is not a regular file."),

	     library);

      free (path);

      return;

    }

  if (process_file (real_library, library, libname, &flag, &osversion,

		    &soname, 0, &stat_buf))

    {

      error (0, 0, _("No link created since soname could not be found for %s"),

	     library);

      free (path);

      return;

    }

  if (soname == NULL)

    soname = implicit_soname (libname, flag);

  create_links (real_path, path, libname, soname);

  free (soname);

  free (path);

}

/* Read a whole directory and search for libraries.

   The purpose is two-fold:

   - search for libraries which will be added to the cache

   - create symbolic links to the soname for each library

   This has to be done separatly for each directory.

   To keep track of which libraries to add to the cache and which

   links to create, we save a list of all libraries.

   The algorithm is basically:

   for all libraries in the directory do

     get soname of library

     if soname is already in list

       if new library is newer, replace entry

       otherwise ignore this library

     otherwise add library to list

   For example, if the two libraries libxy.so.1.1 and libxy.so.1.2

   exist and both have the same soname, e.g. libxy.so, a symbolic link

   is created from libxy.so.1.2 (the newer one) to libxy.so.

   libxy.so.1.2 and libxy.so are added to the cache - but not

   libxy.so.1.1.  */

/* Information for one library.  */

struct dlib_entry

{

  char *name;

  char *soname;

  int flag;

  int is_link;

  unsigned int osversion;

  struct dlib_entry *next;

};

static void

search_dir (const struct dir_entry *entry)

{

  uint64_t hwcap;

  if (entry->hwcaps == NULL)

    {

      hwcap = path_hwcap (entry->path);

      if (opt_verbose)

	{

	  if (hwcap != 0)

	    printf ("%s: (hwcap: %#.16" PRIx64 ")", entry->path, hwcap);

	  else

	    printf ("%s:", entry->path);

	}

    }

  else

    {

      hwcap = 0;

      if (opt_verbose)

	printf ("%s: (hwcap: \"%s\")", entry->path,

		glibc_hwcaps_subdirectory_name (entry->hwcaps));

    }

  if (opt_verbose)

    printf (_(" (from %s:%d)\n"), entry->from_file, entry->from_line);

  char *dir_name;

  char *real_file_name;

  size_t real_file_name_len;

  size_t file_name_len = PATH_MAX;

  char *file_name = alloca (file_name_len);

  if (opt_chroot)

    {

      dir_name = chroot_canon (opt_chroot, entry->path);

      real_file_name_len = PATH_MAX;

      real_file_name = alloca (real_file_name_len);

    }

  else

    {

      dir_name = entry->path;

      real_file_name_len = 0;

      real_file_name = file_name;

    }

  DIR *dir;

  if (dir_name == NULL || (dir = opendir (dir_name)) == NULL)

    {

      if (opt_verbose)

	error (0, errno, _("Can't open directory %s"), entry->path);

      if (opt_chroot && dir_name)

	free (dir_name);

      return;

    }

  struct dirent64 *direntry;

  struct dlib_entry *dlibs = NULL;

  while ((direntry = readdir64 (dir)) != NULL)

    {

      int flag;

      /* We only look at links and regular files.  */

      if (direntry->d_type != DT_UNKNOWN

	  && direntry->d_type != DT_LNK

	  && direntry->d_type != DT_REG

	  && direntry->d_type != DT_DIR)

	continue;

      /* Does this file look like a shared library or is it a hwcap

	 subdirectory (if not already processing a glibc-hwcaps

	 subdirectory)?  The dynamic linker is also considered as

	 shared library.  */

      if (((strncmp (direntry->d_name, "lib", 3) != 0

	    && strncmp (direntry->d_name, "ld-", 3) != 0)

	   || strstr (direntry->d_name, ".so") == NULL)

	  && (direntry->d_type == DT_REG

	      || (entry->hwcaps == NULL

		  && !is_hwcap_platform (direntry->d_name))))

	continue;

      size_t len = strlen (direntry->d_name);

      /* Skip temporary files created by the prelink program.  Files with

	 names like these are never really DSOs we want to look at.  */

      if (len >= sizeof (".#prelink#") - 1)

	{

	  if (strcmp (direntry->d_name + len - sizeof (".#prelink#") + 1,

		      ".#prelink#") == 0)

	    continue;

	  if (len >= sizeof (".#prelink#.XXXXXX") - 1

	      && memcmp (direntry->d_name + len - sizeof (".#prelink#.XXXXXX")

			 + 1, ".#prelink#.", sizeof (".#prelink#.") - 1) == 0)

	    continue;

	}

      len += strlen (entry->path) + 2;

      if (len > file_name_len)

	{

	  file_name_len = len;

	  file_name = alloca (file_name_len);

	  if (!opt_chroot)

	    real_file_name = file_name;

	}

      sprintf (file_name, "%s/%s", entry->path, direntry->d_name);

      if (opt_chroot)

	{

	  len = strlen (dir_name) + strlen (direntry->d_name) + 2;

	  if (len > real_file_name_len)

	    {

	      real_file_name_len = len;

	      real_file_name = alloca (real_file_name_len);

	    }