Zbigniew Jędrzejewski-Szmek
254d1313ae
-1 was used everywhere, but -EBADF or -EBADFD started being used in various places. Let's make things consistent in the new style. Note that there are two candidates: EBADF 9 Bad file descriptor EBADFD 77 File descriptor in bad state Since we're initializating the fd, we're just assigning a value that means "no fd yet", so it's just a bad file descriptor, and the first errno fits better. If instead we had a valid file descriptor that became invalid because of some operation or state change, the other errno would fit better. In some places, initialization is dropped if unnecessary.
379 lines
11 KiB
C
379 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fcntl.h>
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#include <langinfo.h>
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#include <libintl.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include "constants.h"
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#include "dirent-util.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "hashmap.h"
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#include "locale-util.h"
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#include "path-util.h"
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#include "set.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#include "utf8.h"
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static char *normalize_locale(const char *name) {
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const char *e;
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/* Locale names are weird: glibc has some magic rules when looking for the charset name on disk: it
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* lowercases everything, and removes most special chars. This means the official .UTF-8 suffix
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* becomes .utf8 when looking things up on disk. When enumerating locales, let's do the reverse
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* operation, and go back to ".UTF-8" which appears to be the more commonly accepted name. We only do
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* that for UTF-8 however, since it's kinda the only charset that matters. */
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e = endswith(name, ".utf8");
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if (e) {
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_cleanup_free_ char *prefix = NULL;
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prefix = strndup(name, e - name);
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if (!prefix)
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return NULL;
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return strjoin(prefix, ".UTF-8");
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}
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e = strstr(name, ".utf8@");
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if (e) {
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_cleanup_free_ char *prefix = NULL;
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prefix = strndup(name, e - name);
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if (!prefix)
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return NULL;
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return strjoin(prefix, ".UTF-8@", e + 6);
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}
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return strdup(name);
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}
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static int add_locales_from_archive(Set *locales) {
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/* Stolen from glibc... */
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struct locarhead {
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uint32_t magic;
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/* Serial number. */
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uint32_t serial;
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/* Name hash table. */
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uint32_t namehash_offset;
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uint32_t namehash_used;
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uint32_t namehash_size;
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/* String table. */
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uint32_t string_offset;
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uint32_t string_used;
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uint32_t string_size;
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/* Table with locale records. */
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uint32_t locrectab_offset;
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uint32_t locrectab_used;
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uint32_t locrectab_size;
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/* MD5 sum hash table. */
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uint32_t sumhash_offset;
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uint32_t sumhash_used;
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uint32_t sumhash_size;
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};
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struct namehashent {
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/* Hash value of the name. */
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uint32_t hashval;
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/* Offset of the name in the string table. */
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uint32_t name_offset;
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/* Offset of the locale record. */
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uint32_t locrec_offset;
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};
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const struct locarhead *h;
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const struct namehashent *e;
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const void *p = MAP_FAILED;
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_cleanup_close_ int fd = -EBADF;
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size_t sz = 0;
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struct stat st;
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int r;
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fd = open("/usr/lib/locale/locale-archive", O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return errno == ENOENT ? 0 : -errno;
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if (fstat(fd, &st) < 0)
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return -errno;
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if (!S_ISREG(st.st_mode))
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return -EBADMSG;
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if (st.st_size < (off_t) sizeof(struct locarhead))
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return -EBADMSG;
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if (file_offset_beyond_memory_size(st.st_size))
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return -EFBIG;
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p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED)
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return -errno;
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h = (const struct locarhead *) p;
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if (h->magic != 0xde020109 ||
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h->namehash_offset + h->namehash_size > st.st_size ||
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h->string_offset + h->string_size > st.st_size ||
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h->locrectab_offset + h->locrectab_size > st.st_size ||
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h->sumhash_offset + h->sumhash_size > st.st_size) {
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r = -EBADMSG;
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goto finish;
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}
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e = (const struct namehashent*) ((const uint8_t*) p + h->namehash_offset);
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for (size_t i = 0; i < h->namehash_size; i++) {
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char *z;
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if (e[i].locrec_offset == 0)
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continue;
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if (!utf8_is_valid((char*) p + e[i].name_offset))
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continue;
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z = normalize_locale((char*) p + e[i].name_offset);
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if (!z) {
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r = -ENOMEM;
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goto finish;
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}
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r = set_consume(locales, z);
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if (r < 0)
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goto finish;
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}
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r = 0;
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finish:
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if (p != MAP_FAILED)
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munmap((void*) p, sz);
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return r;
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}
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static int add_locales_from_libdir(Set *locales) {
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_cleanup_closedir_ DIR *dir = NULL;
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int r;
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dir = opendir("/usr/lib/locale");
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if (!dir)
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return errno == ENOENT ? 0 : -errno;
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FOREACH_DIRENT(de, dir, return -errno) {
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char *z;
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if (de->d_type != DT_DIR)
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continue;
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z = normalize_locale(de->d_name);
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if (!z)
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return -ENOMEM;
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r = set_consume(locales, z);
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if (r < 0 && r != -EEXIST)
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return r;
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}
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return 0;
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}
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int get_locales(char ***ret) {
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_cleanup_set_free_free_ Set *locales = NULL;
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_cleanup_strv_free_ char **l = NULL;
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int r;
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locales = set_new(&string_hash_ops);
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if (!locales)
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return -ENOMEM;
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r = add_locales_from_archive(locales);
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if (r < 0 && r != -ENOENT)
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return r;
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r = add_locales_from_libdir(locales);
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if (r < 0)
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return r;
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char *locale;
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SET_FOREACH(locale, locales) {
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r = locale_is_installed(locale);
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if (r < 0)
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return r;
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if (r == 0)
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free(set_remove(locales, locale));
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}
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l = set_get_strv(locales);
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if (!l)
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return -ENOMEM;
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/* Now, all elements are owned by strv 'l'. Hence, do not call set_free_free(). */
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locales = set_free(locales);
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r = getenv_bool("SYSTEMD_LIST_NON_UTF8_LOCALES");
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if (r == -ENXIO || r == 0) {
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char **a, **b;
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/* Filter out non-UTF-8 locales, because it's 2019, by default */
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for (a = b = l; *a; a++) {
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if (endswith(*a, "UTF-8") ||
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strstr(*a, ".UTF-8@"))
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*(b++) = *a;
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else
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free(*a);
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}
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*b = NULL;
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} else if (r < 0)
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log_debug_errno(r, "Failed to parse $SYSTEMD_LIST_NON_UTF8_LOCALES as boolean");
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strv_sort(l);
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*ret = TAKE_PTR(l);
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return 0;
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}
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bool locale_is_valid(const char *name) {
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if (isempty(name))
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return false;
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if (strlen(name) >= 128)
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return false;
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if (!utf8_is_valid(name))
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return false;
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if (!filename_is_valid(name))
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return false;
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if (!string_is_safe(name))
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return false;
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return true;
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}
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int locale_is_installed(const char *name) {
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if (!locale_is_valid(name))
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return false;
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if (STR_IN_SET(name, "C", "POSIX")) /* These ones are always OK */
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return true;
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_cleanup_(freelocalep) locale_t loc =
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newlocale(LC_ALL_MASK, name, 0);
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if (loc == (locale_t) 0)
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return errno == ENOMEM ? -ENOMEM : false;
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return true;
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}
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void init_gettext(void) {
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setlocale(LC_ALL, "");
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textdomain(GETTEXT_PACKAGE);
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}
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bool is_locale_utf8(void) {
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static int cached_answer = -1;
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const char *set;
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int r;
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/* Note that we default to 'true' here, since today UTF8 is
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* pretty much supported everywhere. */
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if (cached_answer >= 0)
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goto out;
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r = getenv_bool_secure("SYSTEMD_UTF8");
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if (r >= 0) {
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cached_answer = r;
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goto out;
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} else if (r != -ENXIO)
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log_debug_errno(r, "Failed to parse $SYSTEMD_UTF8, ignoring: %m");
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if (!setlocale(LC_ALL, "")) {
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cached_answer = true;
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goto out;
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}
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set = nl_langinfo(CODESET);
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if (!set) {
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cached_answer = true;
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goto out;
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}
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if (streq(set, "UTF-8")) {
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cached_answer = true;
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goto out;
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}
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/* For LC_CTYPE=="C" return true, because CTYPE is effectively
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* unset and everything can do to UTF-8 nowadays. */
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set = setlocale(LC_CTYPE, NULL);
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if (!set) {
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cached_answer = true;
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goto out;
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}
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/* Check result, but ignore the result if C was set
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* explicitly. */
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cached_answer =
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STR_IN_SET(set, "C", "POSIX") &&
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!getenv("LC_ALL") &&
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!getenv("LC_CTYPE") &&
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!getenv("LANG");
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out:
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return (bool) cached_answer;
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}
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void locale_variables_free(char *l[_VARIABLE_LC_MAX]) {
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if (!l)
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return;
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for (LocaleVariable i = 0; i < _VARIABLE_LC_MAX; i++)
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l[i] = mfree(l[i]);
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}
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void locale_variables_simplify(char *l[_VARIABLE_LC_MAX]) {
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assert(l);
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for (LocaleVariable p = 0; p < _VARIABLE_LC_MAX; p++) {
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if (p == VARIABLE_LANG)
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continue;
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if (isempty(l[p]) || streq_ptr(l[VARIABLE_LANG], l[p]))
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l[p] = mfree(l[p]);
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}
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}
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static const char * const locale_variable_table[_VARIABLE_LC_MAX] = {
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[VARIABLE_LANG] = "LANG",
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[VARIABLE_LANGUAGE] = "LANGUAGE",
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[VARIABLE_LC_CTYPE] = "LC_CTYPE",
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[VARIABLE_LC_NUMERIC] = "LC_NUMERIC",
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[VARIABLE_LC_TIME] = "LC_TIME",
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[VARIABLE_LC_COLLATE] = "LC_COLLATE",
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[VARIABLE_LC_MONETARY] = "LC_MONETARY",
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[VARIABLE_LC_MESSAGES] = "LC_MESSAGES",
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[VARIABLE_LC_PAPER] = "LC_PAPER",
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[VARIABLE_LC_NAME] = "LC_NAME",
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[VARIABLE_LC_ADDRESS] = "LC_ADDRESS",
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[VARIABLE_LC_TELEPHONE] = "LC_TELEPHONE",
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[VARIABLE_LC_MEASUREMENT] = "LC_MEASUREMENT",
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[VARIABLE_LC_IDENTIFICATION] = "LC_IDENTIFICATION"
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};
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DEFINE_STRING_TABLE_LOOKUP(locale_variable, LocaleVariable);
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