diff options
Diffstat (limited to 'REORG.TODO/elf/ldconfig.c')
| -rw-r--r-- | REORG.TODO/elf/ldconfig.c | 1418 |
1 files changed, 1418 insertions, 0 deletions
diff --git a/REORG.TODO/elf/ldconfig.c b/REORG.TODO/elf/ldconfig.c new file mode 100644 index 0000000000..99caf9e9bb --- /dev/null +++ b/REORG.TODO/elf/ldconfig.c @@ -0,0 +1,1418 @@ +/* Copyright (C) 1999-2017 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 <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-procinfo.h> + +#ifdef _DL_FIRST_PLATFORM +# define _DL_FIRST_EXTRA (_DL_FIRST_PLATFORM + _DL_PLATFORMS_COUNT) +#else +# define _DL_FIRST_EXTRA _DL_HWCAP_COUNT +#endif + +#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; + 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. */ +/* 0: only libc5/glibc2; 1: both; 2: only glibc 2.2. */ +int opt_format = 1; + +/* 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; + +/* Configuration-defined capabilities defined in kernel vDSOs. */ +static const char *hwcap_extra[64 - _DL_FIRST_EXTRA]; + +/* 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, old or compat (default)"), 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; + + /* Is this one of the extra pseudo-hwcaps that we map beyond + _DL_FIRST_EXTRA like "tls", or "nosegneg?" */ + for (hwcap_idx = _DL_FIRST_EXTRA; hwcap_idx < 64; ++hwcap_idx) + if (hwcap_extra[hwcap_idx - _DL_FIRST_EXTRA] != NULL + && !strcmp (name, hwcap_extra[hwcap_idx - _DL_FIRST_EXTRA])) + 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) + { + for (h = _DL_FIRST_EXTRA; h < 64; ++h) + if (hwcap_extra[h - _DL_FIRST_EXTRA] != NULL + && !strcmp (ptr + 1, hwcap_extra[h - _DL_FIRST_EXTRA])) + break; + if (h == 64) + 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 = 0; + else if (strcmp (arg, "compat") == 0) + opt_format = 1; + else if (strcmp (arg, "new") == 0) + opt_format = 2; + 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\ +"), "2017"); + fprintf (stream, gettext ("Written by %s.\n"), + "Andreas Jaeger"); +} + +/* Add a single directory entry. */ +static void +add_single_dir (struct dir_entry *entry, int verbose) +{ + struct dir_entry *ptr, *prev; + + 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); + /* Use the newer information. */ + ptr->flag = entry->flag; + free (entry->path); + free (entry); + 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; +} + +/* Add one directory to the list of directories to process. */ +static void +add_dir (const char *line) +{ + unsigned int i; + struct dir_entry *entry = xmalloc (sizeof (struct dir_entry)); + entry->next = NULL; + + /* 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; + + add_single_dir (entry, 1); + } + + if (opt_chroot) + free (path); +} + + +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 = path_hwcap (entry->path); + if (opt_verbose) + { + if (hwcap != 0) + printf ("%s: (hwcap: %#.16" PRIx64 ")\n", entry->path, hwcap); + else + printf ("%s:\n", entry->path); + } + + 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; +#ifdef _DIRENT_HAVE_D_TYPE + /* 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; +#endif /* _DIRENT_HAVE_D_TYPE */ + /* Does this file look like a shared library or is it a hwcap + 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) + && ( +#ifdef _DIRENT_HAVE_D_TYPE + direntry->d_type == DT_REG || +#endif + !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); + } + sprintf (real_file_name, "%s/%s", dir_name, direntry->d_name); + } + + struct stat64 lstat_buf; +#ifdef _DIRENT_HAVE_D_TYPE + /* We optimize and try to do the lstat call only if needed. */ + if (direntry->d_type != DT_UNKNOWN) + lstat_buf.st_mode = DTTOIF (direntry->d_type); + else +#endif + if (__glibc_unlikely (lstat64 (real_file_name, &lstat_buf))) + { + error (0, errno, _("Cannot lstat %s"), file_name); + continue; + } + + struct stat64 stat_buf; + int is_dir; + int is_link = S_ISLNK (lstat_buf.st_mode); + if (is_link) + { + /* In case of symlink, we check if the symlink refers to + a directory. */ + char *target_name = real_file_name; + if (opt_chroot) + { + target_name = chroot_canon (opt_chroot, file_name); + if (target_name == NULL) + { + if (strstr (file_name, ".so") == NULL) + error (0, 0, _("Input file %s not found.\n"), file_name); + continue; + } + } + if (__glibc_unlikely (stat64 (target_name, &stat_buf))) + { + if (opt_verbose) + error (0, errno, _("Cannot stat %s"), file_name); + + /* Remove stale symlinks. */ + if (opt_link && strstr (direntry->d_name, ".so.")) + unlink (real_file_name); + continue; + } + is_dir = S_ISDIR (stat_buf.st_mode); + + /* lstat_buf is later stored, update contents. */ + lstat_buf.st_dev = stat_buf.st_dev; + lstat_buf.st_ino = stat_buf.st_ino; + lstat_buf.st_size = stat_buf.st_size; + lstat_buf.st_ctime = stat_buf.st_ctime; + } + else + is_dir = S_ISDIR (lstat_buf.st_mode); + + if (is_dir && is_hwcap_platform (direntry->d_name)) + { + /* Handle subdirectory later. */ + struct dir_entry *new_entry; + + new_entry = xmalloc (sizeof (struct dir_entry)); + new_entry->path = xstrdup (file_name); + new_entry->flag = entry->flag; + new_entry->next = NULL; +#ifdef _DIRENT_HAVE_D_TYPE + /* We have filled in lstat only #ifndef + _DIRENT_HAVE_D_TYPE. Fill it in if needed. */ + if (!is_link + && direntry->d_type != DT_UNKNOWN + && __builtin_expect (lstat64 (real_file_name, &lstat_buf), 0)) + { + error (0, errno, _("Cannot lstat %s"), file_name); + free (new_entry->path); + free (new_entry); + continue; + } +#endif + new_entry->ino = lstat_buf.st_ino; + new_entry->dev = lstat_buf.st_dev; + add_single_dir (new_entry, 0); + continue; + } + else if (!S_ISREG (lstat_buf.st_mode) && !is_link) + continue; + + char *real_name; + if (opt_chroot && is_link) + { + real_name = chroot_canon (opt_chroot, file_name); + if (real_name == NULL) + { + if (strstr (file_name, ".so") == NULL) + error (0, 0, _("Input file %s not found.\n"), file_name); + continue; + } + } + else + real_name = real_file_name; + +#ifdef _DIRENT_HAVE_D_TYPE + /* Call lstat64 if not done yet. */ + if (!is_link + && direntry->d_type != DT_UNKNOWN + && __builtin_expect (lstat64 (real_file_name, &lstat_buf), 0)) + { + error (0, errno, _("Cannot lstat %s"), file_name); + continue; + } +#endif + + /* First search whether the auxiliary cache contains this + library already and it's not changed. */ + char *soname; + unsigned int osversion; + if (!search_aux_cache (&lstat_buf, &flag, &osversion, &soname)) + { + if (process_file (real_name, file_name, direntry->d_name, &flag, + &osversion, &soname, is_link, &lstat_buf)) + { + if (real_name != real_file_name) + free (real_name); + continue; + } + else if (opt_build_cache) + add_to_aux_cache (&lstat_buf, flag, osversion, soname); + } + + if (soname == NULL) + soname = implicit_soname (direntry->d_name, flag); + + /* A link may just point to itself. */ + if (is_link) + { + /* If the path the link points to isn't its soname or it is not + the .so symlink for ld(1), we treat it as a normal file. + + You should always do this: + + libfoo.so -> SONAME -> Arbitrary package-chosen name. + + e.g. libfoo.so -> libfoo.so.1 -> libfooimp.so.9.99. + Given a SONAME of libfoo.so.1. + + You should *never* do this: + + libfoo.so -> libfooimp.so.9.99 + + If you do, and your SONAME is libfoo.so.1, then libfoo.so + fails to point at the SONAME. In that case ldconfig may consider + libfoo.so as another implementation of SONAME and will create + symlinks against it causing problems when you try to upgrade + or downgrade. The problems will arise because ldconfig will, + depending on directory ordering, creat symlinks against libfoo.so + e.g. libfoo.so.1.2 -> libfoo.so, but when libfoo.so is removed + (typically by the removal of a development pacakge not required + for the runtime) it will break the libfoo.so.1.2 symlink and the + application will fail to start. */ + const char *real_base_name = basename (real_file_name); + + if (strcmp (real_base_name, soname) != 0) + { + len = strlen (real_base_name); + if (len < strlen (".so") + || strcmp (real_base_name + len - strlen (".so"), ".so") != 0 + || strncmp (real_base_name, soname, len) != 0) + is_link = 0; + } + } + + if (real_name != real_file_name) + free (real_name); + + if (is_link) + { + free (soname); + soname = xstrdup (direntry->d_name); + } + + if (flag == FLAG_ELF + && (entry->flag == FLAG_ELF_LIBC5 + || entry->flag == FLAG_ELF_LIBC6)) + flag = entry->flag; + + /* Some sanity checks to print warnings. */ + if (opt_verbose) + { + if (flag == FLAG_ELF_LIBC5 && entry->flag != FLAG_ELF_LIBC5 + && entry->flag != FLAG_ANY) + error (0, 0, _("libc5 library %s in wrong directory"), file_name); + if (flag == FLAG_ELF_LIBC6 && entry->flag != FLAG_ELF_LIBC6 + && entry->flag != FLAG_ANY) + error (0, 0, _("libc6 library %s in wrong directory"), file_name); + if (flag == FLAG_LIBC4 && entry->flag != FLAG_LIBC4 + && entry->flag != FLAG_ANY) + error (0, 0, _("libc4 library %s in wrong directory"), file_name); + } + + /* Add library to list. */ + struct dlib_entry *dlib_ptr; + for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next) + { + /* Is soname already in list? */ + if (strcmp (dlib_ptr->soname, soname) == 0) + { + /* Prefer a file to a link, otherwise check which one + is newer. */ + if ((!is_link && dlib_ptr->is_link) + || (is_link == dlib_ptr->is_link + && _dl_cache_libcmp (dlib_ptr->name, direntry->d_name) < 0)) + { + /* It's newer - add it. */ + /* Flag should be the same - sanity check. */ + if (dlib_ptr->flag != flag) + { + if (dlib_ptr->flag == FLAG_ELF + && (flag == FLAG_ELF_LIBC5 || flag == FLAG_ELF_LIBC6)) + dlib_ptr->flag = flag; + else if ((dlib_ptr->flag == FLAG_ELF_LIBC5 + || dlib_ptr->flag == FLAG_ELF_LIBC6) + && flag == FLAG_ELF) + dlib_ptr->flag = flag; + else + error (0, 0, _("libraries %s and %s in directory %s have same soname but different type."), + dlib_ptr->name, direntry->d_name, + entry->path); + } + free (dlib_ptr->name); + dlib_ptr->name = xstrdup (direntry->d_name); + dlib_ptr->is_link = is_link; + dlib_ptr->osversion = osversion; + } + /* Don't add this library, abort loop. */ + /* Also free soname, since it's dynamically allocated. */ + free (soname); + break; + } + } + /* Add the library if it's not already in. */ + if (dlib_ptr == NULL) + { + dlib_ptr = (struct dlib_entry *)xmalloc (sizeof (struct dlib_entry)); + dlib_ptr->name = xstrdup (direntry->d_name); + dlib_ptr->soname = soname; + dlib_ptr->flag = flag; + dlib_ptr->is_link = is_link; + dlib_ptr->osversion = osversion; + /* Add at head of list. */ + dlib_ptr->next = dlibs; + dlibs = dlib_ptr; + } + } + + closedir (dir); + + /* Now dlibs contains a list of all libs - add those to the cache + and created all symbolic links. */ + struct dlib_entry *dlib_ptr; + for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next) + { + /* Don't create links to links. */ + if (dlib_ptr->is_link == 0) + create_links (dir_name, entry->path, dlib_ptr->name, + dlib_ptr->soname); + if (opt_build_cache) + add_to_cache (entry->path, dlib_ptr->soname, dlib_ptr->flag, + dlib_ptr->osversion, hwcap); + } + + /* Free all resources. */ + while (dlibs) + { + dlib_ptr = dlibs; + free (dlib_ptr->soname); + free (dlib_ptr->name); + dlibs = dlibs->next; + free (dlib_ptr); + } + + if (opt_chroot && dir_name) + free (dir_name); +} + +/* Search through all libraries. */ +static void +search_dirs (void) +{ + struct dir_entry *entry; + + for (entry = dir_entries; entry != NULL; entry = entry->next) + search_dir (entry); + + /* Free all allocated memory. */ + while (dir_entries) + { + entry = dir_entries; + dir_entries = dir_entries->next; + free (entry->path); + free (entry); + } +} + + +static void parse_conf_include (const char *config_file, unsigned int lineno, + bool do_chroot, const char *pattern); + +/* Parse configuration file. */ +static void +parse_conf (const char *filename, bool do_chroot) +{ + FILE *file = NULL; + char *line = NULL; + const char *canon; + size_t len = 0; + unsigned int lineno; + + if (do_chroot && opt_chroot) + { + canon = chroot_canon (opt_chroot, filename); + if (canon) + file = fopen (canon, "r"); + else + canon = filename; + } + else + { + canon = filename; + file = fopen (filename, "r"); + } + + if (file == NULL) + { + error (0, errno, _("\ +Warning: ignoring configuration file that cannot be opened: %s"), + canon); + if (canon != filename) + free ((char *) canon); + return; + } + + /* No threads use this stream. */ + __fsetlocking (file, FSETLOCKING_BYCALLER); + + if (canon != filename) + free ((char *) canon); + + lineno = 0; + do + { + ssize_t n = getline (&line, &len, file); + if (n < 0) + break; + + ++lineno; + if (line[n - 1] == '\n') + line[n - 1] = '\0'; + + /* Because the file format does not know any form of quoting we + can search forward for the next '#' character and if found + make it terminating the line. */ + *strchrnul (line, '#') = '\0'; + + /* Remove leading whitespace. NUL is no whitespace character. */ + char *cp = line; + while (isspace (*cp)) + ++cp; + + /* If the line is blank it is ignored. */ + if (cp[0] == '\0') + continue; + + if (!strncmp (cp, "include", 7) && isblank (cp[7])) + { + char *dir; + cp += 8; + while ((dir = strsep (&cp, " \t")) != NULL) + if (dir[0] != '\0') + parse_conf_include (filename, lineno, do_chroot, dir); + } + else if (!strncasecmp (cp, "hwcap", 5) && isblank (cp[5])) + { + cp += 6; + char *p, *name = NULL; + unsigned long int n = strtoul (cp, &cp, 0); + if (cp != NULL && isblank (*cp)) + while ((p = strsep (&cp, " \t")) != NULL) + if (p[0] != '\0') + { + if (name == NULL) + name = p; + else + { + name = NULL; + break; + } + } + if (name == NULL) + { + error (EXIT_FAILURE, 0, _("%s:%u: bad syntax in hwcap line"), + filename, lineno); + break; + } + if (n >= (64 - _DL_FIRST_EXTRA)) + error (EXIT_FAILURE, 0, + _("%s:%u: hwcap index %lu above maximum %u"), + filename, lineno, n, 64 - _DL_FIRST_EXTRA - 1); + if (hwcap_extra[n] == NULL) + { + for (unsigned long int h = 0; h < (64 - _DL_FIRST_EXTRA); ++h) + if (hwcap_extra[h] != NULL && !strcmp (name, hwcap_extra[h])) + error (EXIT_FAILURE, 0, + _("%s:%u: hwcap index %lu already defined as %s"), + filename, lineno, h, name); + hwcap_extra[n] = xstrdup (name); + } + else + { + if (strcmp (name, hwcap_extra[n])) + error (EXIT_FAILURE, 0, + _("%s:%u: hwcap index %lu already defined as %s"), + filename, lineno, n, hwcap_extra[n]); + if (opt_verbose) + error (0, 0, _("%s:%u: duplicate hwcap %lu %s"), + filename, lineno, n, name); + } + } + else + add_dir (cp); + } + while (!feof_unlocked (file)); + + /* Free buffer and close file. */ + free (line); + fclose (file); +} + +/* Handle one word in an `include' line, a glob pattern of additional + config files to read. */ +static void +parse_conf_include (const char *config_file, unsigned int lineno, + bool do_chroot, const char *pattern) +{ + if (opt_chroot && pattern[0] != '/') + error (EXIT_FAILURE, 0, + _("need absolute file name for configuration file when using -r")); + + char *copy = NULL; + if (pattern[0] != '/' && strchr (config_file, '/') != NULL) + { + if (asprintf (©, "%s/%s", dirname (strdupa (config_file)), + pattern) < 0) + error (EXIT_FAILURE, 0, _("memory exhausted")); + pattern = copy; + } + + glob64_t gl; + int result; + if (do_chroot && opt_chroot) + { + char *canon = chroot_canon (opt_chroot, pattern); + if (canon == NULL) + return; + result = glob64 (canon, 0, NULL, &gl); + free (canon); + } + else + result = glob64 (pattern, 0, NULL, &gl); + + switch (result) + { + case 0: + for (size_t i = 0; i < gl.gl_pathc; ++i) + parse_conf (gl.gl_pathv[i], false); + globfree64 (&gl); + break; + + case GLOB_NOMATCH: + break; + + case GLOB_NOSPACE: + errno = ENOMEM; + case GLOB_ABORTED: + if (opt_verbose) + error (0, errno, _("%s:%u: cannot read directory %s"), + config_file, lineno, pattern); + break; + + default: + abort (); + break; + } + + free (copy); +} + +/* Honour LD_HWCAP_MASK. */ +static void +set_hwcap (void) +{ + char *mask = getenv ("LD_HWCAP_MASK"); + + if (mask) + hwcap_mask = strtoul (mask, NULL, 0); +} + + +int +main (int argc, char **argv) +{ + /* Set locale via LC_ALL. */ + setlocale (LC_ALL, ""); + + /* Set the text message domain. */ + textdomain (_libc_intl_domainname); + + /* Parse and process arguments. */ + int remaining; + argp_parse (&argp, argc, argv, 0, &remaining, NULL); + + /* Remaining arguments are additional directories if opt_manual_link + is not set. */ + if (remaining != argc && !opt_manual_link) + { + int i; + for (i = remaining; i < argc; ++i) + if (opt_build_cache && argv[i][0] != '/') + error (EXIT_FAILURE, 0, + _("relative path `%s' used to build cache"), + argv[i]); + else + add_dir (argv[i]); + } + + /* The last entry in hwcap_extra is reserved for the "tls" pseudo-hwcap which + indicates support for TLS. This pseudo-hwcap is only used by old versions + under which TLS support was optional. The entry is no longer needed, but + must remain for compatibility. */ + hwcap_extra[63 - _DL_FIRST_EXTRA] = "tls"; + + set_hwcap (); + + if (opt_chroot) + { + /* Normalize the path a bit, we might need it for printing later. */ + char *endp = rawmemchr (opt_chroot, '\0'); + while (endp > opt_chroot && endp[-1] == '/') + --endp; + *endp = '\0'; + if (endp == opt_chroot) + opt_chroot = NULL; + + if (opt_chroot) + { + /* It is faster to use chroot if we can. */ + if (!chroot (opt_chroot)) + { + if (chdir ("/")) + error (EXIT_FAILURE, errno, _("Can't chdir to /")); + opt_chroot = NULL; + } + } + } + + if (cache_file == NULL) + { + cache_file = alloca (strlen (LD_SO_CACHE) + 1); + strcpy (cache_file, LD_SO_CACHE); + } + + if (config_file == NULL) + config_file = LD_SO_CONF; + + if (opt_print_cache) + { + if (opt_chroot) + { + char *p = chroot_canon (opt_chroot, cache_file); + if (p == NULL) + error (EXIT_FAILURE, errno, _("Can't open cache file %s\n"), + cache_file); + cache_file = p; + } + print_cache (cache_file); + if (opt_chroot) + free (cache_file); + exit (0); + } + + if (opt_chroot) + { + /* Canonicalize the directory name of cache_file, not cache_file, + because we'll rename a temporary cache file to it. */ + char *p = strrchr (cache_file, '/'); + char *canon = chroot_canon (opt_chroot, + p ? (*p = '\0', cache_file) : "/"); + + if (canon == NULL) + error (EXIT_FAILURE, errno, + _("Can't open cache file directory %s\n"), + p ? cache_file : "/"); + + if (p) + ++p; + else + p = cache_file; + + cache_file = alloca (strlen (canon) + strlen (p) + 2); + sprintf (cache_file, "%s/%s", canon, p); + free (canon); + } + + if (opt_manual_link) + { + /* Link all given libraries manually. */ + int i; + + for (i = remaining; i < argc; ++i) + manual_link (argv[i]); + + exit (0); + } + + + if (opt_build_cache) + init_cache (); + + if (!opt_only_cline) + { + parse_conf (config_file, true); + + /* Always add the standard search paths. */ + add_system_dir (SLIBDIR); + if (strcmp (SLIBDIR, LIBDIR)) + add_system_dir (LIBDIR); + } + + const char *aux_cache_file = _PATH_LDCONFIG_AUX_CACHE; + if (opt_chroot) + aux_cache_file = chroot_canon (opt_chroot, aux_cache_file); + + if (! opt_ignore_aux_cache && aux_cache_file) + load_aux_cache (aux_cache_file); + else + init_aux_cache (); + + search_dirs (); + + if (opt_build_cache) + { + save_cache (cache_file); + if (aux_cache_file) + save_aux_cache (aux_cache_file); + } + + return 0; +} |