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-rw-r--r--src/basic/locale-util.c376
1 files changed, 376 insertions, 0 deletions
diff --git a/src/basic/locale-util.c b/src/basic/locale-util.c
new file mode 100644
index 0000000..d3fef01
--- /dev/null
+++ b/src/basic/locale-util.c
@@ -0,0 +1,376 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <langinfo.h>
+#include <libintl.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include "constants.h"
+#include "dirent-util.h"
+#include "env-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "hashmap.h"
+#include "locale-util.h"
+#include "missing_syscall.h"
+#include "path-util.h"
+#include "set.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "utf8.h"
+
+static char *normalize_locale(const char *name) {
+ const char *e;
+
+ /* Locale names are weird: glibc has some magic rules when looking for the charset name on disk: it
+ * lowercases everything, and removes most special chars. This means the official .UTF-8 suffix
+ * becomes .utf8 when looking things up on disk. When enumerating locales, let's do the reverse
+ * operation, and go back to ".UTF-8" which appears to be the more commonly accepted name. We only do
+ * that for UTF-8 however, since it's kinda the only charset that matters. */
+
+ e = endswith(name, ".utf8");
+ if (e) {
+ _cleanup_free_ char *prefix = NULL;
+
+ prefix = strndup(name, e - name);
+ if (!prefix)
+ return NULL;
+
+ return strjoin(prefix, ".UTF-8");
+ }
+
+ e = strstr(name, ".utf8@");
+ if (e) {
+ _cleanup_free_ char *prefix = NULL;
+
+ prefix = strndup(name, e - name);
+ if (!prefix)
+ return NULL;
+
+ return strjoin(prefix, ".UTF-8@", e + 6);
+ }
+
+ return strdup(name);
+}
+
+static int add_locales_from_archive(Set *locales) {
+ /* Stolen from glibc... */
+
+ struct locarhead {
+ uint32_t magic;
+ /* Serial number. */
+ uint32_t serial;
+ /* Name hash table. */
+ uint32_t namehash_offset;
+ uint32_t namehash_used;
+ uint32_t namehash_size;
+ /* String table. */
+ uint32_t string_offset;
+ uint32_t string_used;
+ uint32_t string_size;
+ /* Table with locale records. */
+ uint32_t locrectab_offset;
+ uint32_t locrectab_used;
+ uint32_t locrectab_size;
+ /* MD5 sum hash table. */
+ uint32_t sumhash_offset;
+ uint32_t sumhash_used;
+ uint32_t sumhash_size;
+ };
+
+ struct namehashent {
+ /* Hash value of the name. */
+ uint32_t hashval;
+ /* Offset of the name in the string table. */
+ uint32_t name_offset;
+ /* Offset of the locale record. */
+ uint32_t locrec_offset;
+ };
+
+ const struct locarhead *h;
+ const struct namehashent *e;
+ const void *p = MAP_FAILED;
+ _cleanup_close_ int fd = -EBADF;
+ size_t sz = 0;
+ struct stat st;
+ int r;
+
+ fd = open("/usr/lib/locale/locale-archive", O_RDONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return errno == ENOENT ? 0 : -errno;
+
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ if (!S_ISREG(st.st_mode))
+ return -EBADMSG;
+
+ if (st.st_size < (off_t) sizeof(struct locarhead))
+ return -EBADMSG;
+
+ if (file_offset_beyond_memory_size(st.st_size))
+ return -EFBIG;
+
+ p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
+ if (p == MAP_FAILED)
+ return -errno;
+
+ h = (const struct locarhead *) p;
+ if (h->magic != 0xde020109 ||
+ h->namehash_offset + h->namehash_size > st.st_size ||
+ h->string_offset + h->string_size > st.st_size ||
+ h->locrectab_offset + h->locrectab_size > st.st_size ||
+ h->sumhash_offset + h->sumhash_size > st.st_size) {
+ r = -EBADMSG;
+ goto finish;
+ }
+
+ e = (const struct namehashent*) ((const uint8_t*) p + h->namehash_offset);
+ for (size_t i = 0; i < h->namehash_size; i++) {
+ char *z;
+
+ if (e[i].locrec_offset == 0)
+ continue;
+
+ if (!utf8_is_valid((char*) p + e[i].name_offset))
+ continue;
+
+ z = normalize_locale((char*) p + e[i].name_offset);
+ if (!z) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = set_consume(locales, z);
+ if (r < 0)
+ goto finish;
+ }
+
+ r = 0;
+
+ finish:
+ if (p != MAP_FAILED)
+ munmap((void*) p, sz);
+
+ return r;
+}
+
+static int add_locales_from_libdir(Set *locales) {
+ _cleanup_closedir_ DIR *dir = NULL;
+ int r;
+
+ dir = opendir("/usr/lib/locale");
+ if (!dir)
+ return errno == ENOENT ? 0 : -errno;
+
+ FOREACH_DIRENT(de, dir, return -errno) {
+ char *z;
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ z = normalize_locale(de->d_name);
+ if (!z)
+ return -ENOMEM;
+
+ r = set_consume(locales, z);
+ if (r < 0 && r != -EEXIST)
+ return r;
+ }
+
+ return 0;
+}
+
+int get_locales(char ***ret) {
+ _cleanup_set_free_free_ Set *locales = NULL;
+ _cleanup_strv_free_ char **l = NULL;
+ int r;
+
+ locales = set_new(&string_hash_ops);
+ if (!locales)
+ return -ENOMEM;
+
+ r = add_locales_from_archive(locales);
+ if (r < 0 && r != -ENOENT)
+ return r;
+
+ r = add_locales_from_libdir(locales);
+ if (r < 0)
+ return r;
+
+ char *locale;
+ SET_FOREACH(locale, locales) {
+ r = locale_is_installed(locale);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ free(set_remove(locales, locale));
+ }
+
+ l = set_get_strv(locales);
+ if (!l)
+ return -ENOMEM;
+
+ /* Now, all elements are owned by strv 'l'. Hence, do not call set_free_free(). */
+ locales = set_free(locales);
+
+ r = getenv_bool("SYSTEMD_LIST_NON_UTF8_LOCALES");
+ if (r == -ENXIO || r == 0) {
+ char **a, **b;
+
+ /* Filter out non-UTF-8 locales, because it's 2019, by default */
+ for (a = b = l; *a; a++) {
+
+ if (endswith(*a, "UTF-8") ||
+ strstr(*a, ".UTF-8@"))
+ *(b++) = *a;
+ else
+ free(*a);
+ }
+
+ *b = NULL;
+
+ } else if (r < 0)
+ log_debug_errno(r, "Failed to parse $SYSTEMD_LIST_NON_UTF8_LOCALES as boolean");
+
+ strv_sort(l);
+
+ *ret = TAKE_PTR(l);
+
+ return 0;
+}
+
+bool locale_is_valid(const char *name) {
+
+ if (isempty(name))
+ return false;
+
+ if (strlen(name) >= 128)
+ return false;
+
+ if (!utf8_is_valid(name))
+ return false;
+
+ if (!filename_is_valid(name))
+ return false;
+
+ if (!string_is_safe(name))
+ return false;
+
+ return true;
+}
+
+int locale_is_installed(const char *name) {
+ if (!locale_is_valid(name))
+ return false;
+
+ if (STR_IN_SET(name, "C", "POSIX")) /* These ones are always OK */
+ return true;
+
+ _cleanup_(freelocalep) locale_t loc =
+ newlocale(LC_ALL_MASK, name, 0);
+ if (loc == (locale_t) 0)
+ return errno == ENOMEM ? -ENOMEM : false;
+
+ return true;
+}
+
+bool is_locale_utf8(void) {
+ static int cached_answer = -1;
+ const char *set;
+ int r;
+
+ /* Note that we default to 'true' here, since today UTF8 is
+ * pretty much supported everywhere. */
+
+ if (cached_answer >= 0)
+ goto out;
+
+ r = getenv_bool_secure("SYSTEMD_UTF8");
+ if (r >= 0) {
+ cached_answer = r;
+ goto out;
+ } else if (r != -ENXIO)
+ log_debug_errno(r, "Failed to parse $SYSTEMD_UTF8, ignoring: %m");
+
+ /* This function may be called from libsystemd, and setlocale() is not thread safe. Assuming yes. */
+ if (gettid() != raw_getpid()) {
+ cached_answer = true;
+ goto out;
+ }
+
+ if (!setlocale(LC_ALL, "")) {
+ cached_answer = true;
+ goto out;
+ }
+
+ set = nl_langinfo(CODESET);
+ if (!set) {
+ cached_answer = true;
+ goto out;
+ }
+
+ if (streq(set, "UTF-8")) {
+ cached_answer = true;
+ goto out;
+ }
+
+ /* For LC_CTYPE=="C" return true, because CTYPE is effectively
+ * unset and everything can do to UTF-8 nowadays. */
+ set = setlocale(LC_CTYPE, NULL);
+ if (!set) {
+ cached_answer = true;
+ goto out;
+ }
+
+ /* Check result, but ignore the result if C was set
+ * explicitly. */
+ cached_answer =
+ STR_IN_SET(set, "C", "POSIX") &&
+ !getenv("LC_ALL") &&
+ !getenv("LC_CTYPE") &&
+ !getenv("LANG");
+
+out:
+ return (bool) cached_answer;
+}
+
+void locale_variables_free(char *l[_VARIABLE_LC_MAX]) {
+ free_many_charp(l, _VARIABLE_LC_MAX);
+}
+
+void locale_variables_simplify(char *l[_VARIABLE_LC_MAX]) {
+ assert(l);
+
+ for (LocaleVariable p = 0; p < _VARIABLE_LC_MAX; p++) {
+ if (p == VARIABLE_LANG)
+ continue;
+ if (isempty(l[p]) || streq_ptr(l[VARIABLE_LANG], l[p]))
+ l[p] = mfree(l[p]);
+ }
+}
+
+static const char * const locale_variable_table[_VARIABLE_LC_MAX] = {
+ [VARIABLE_LANG] = "LANG",
+ [VARIABLE_LANGUAGE] = "LANGUAGE",
+ [VARIABLE_LC_CTYPE] = "LC_CTYPE",
+ [VARIABLE_LC_NUMERIC] = "LC_NUMERIC",
+ [VARIABLE_LC_TIME] = "LC_TIME",
+ [VARIABLE_LC_COLLATE] = "LC_COLLATE",
+ [VARIABLE_LC_MONETARY] = "LC_MONETARY",
+ [VARIABLE_LC_MESSAGES] = "LC_MESSAGES",
+ [VARIABLE_LC_PAPER] = "LC_PAPER",
+ [VARIABLE_LC_NAME] = "LC_NAME",
+ [VARIABLE_LC_ADDRESS] = "LC_ADDRESS",
+ [VARIABLE_LC_TELEPHONE] = "LC_TELEPHONE",
+ [VARIABLE_LC_MEASUREMENT] = "LC_MEASUREMENT",
+ [VARIABLE_LC_IDENTIFICATION] = "LC_IDENTIFICATION"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(locale_variable, LocaleVariable);
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