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1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
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, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <assert.h> | |
20 | #include <errno.h> | |
21 | #include <locale.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #ifdef _POSIX_MAPPED_FILES | |
26 | # include <sys/mman.h> | |
27 | #endif | |
28 | ||
29 | #include "localeinfo.h" | |
30 | #include "../iconv/gconv_charset.h" | |
31 | #include "../iconv/gconv_int.h" | |
32 | ||
33 | ||
34 | #ifdef NL_CURRENT_INDIRECT | |
35 | # define DEFINE_CATEGORY(category, category_name, items, a) \ | |
36 | extern struct __locale_data _nl_C_##category; \ | |
37 | weak_extern (_nl_C_##category) | |
38 | # include "categories.def" | |
39 | # undef DEFINE_CATEGORY | |
40 | ||
41 | /* Array indexed by category of pointers to _nl_C_CATEGORY slots. | |
42 | Elements are zero for categories whose data is never used. */ | |
43 | struct __locale_data *const _nl_C[] attribute_hidden = | |
44 | { | |
45 | # define DEFINE_CATEGORY(category, category_name, items, a) \ | |
46 | [category] = &_nl_C_##category, | |
47 | # include "categories.def" | |
48 | # undef DEFINE_CATEGORY | |
49 | }; | |
50 | #else | |
51 | # define _nl_C (_nl_C_locobj.__locales) | |
52 | #endif | |
53 | ||
54 | ||
55 | /* For each category we keep a list of records for the locale files | |
56 | which are somehow addressed. */ | |
57 | struct loaded_l10nfile *_nl_locale_file_list[__LC_LAST]; | |
58 | ||
59 | const char _nl_default_locale_path[] attribute_hidden = COMPLOCALEDIR; | |
60 | ||
61 | /* Checks if the name is actually present, that is, not NULL and not | |
62 | empty. */ | |
63 | static inline int | |
64 | name_present (const char *name) | |
65 | { | |
66 | return name != NULL && name[0] != '\0'; | |
67 | } | |
68 | ||
69 | /* Checks that the locale name neither extremely long, nor contains a | |
70 | ".." path component (to prevent directory traversal). */ | |
71 | static inline int | |
72 | valid_locale_name (const char *name) | |
73 | { | |
74 | /* Not set. */ | |
75 | size_t namelen = strlen (name); | |
76 | /* Name too long. The limit is arbitrary and prevents stack overflow | |
77 | issues later. */ | |
78 | if (__glibc_unlikely (namelen > 255)) | |
79 | return 0; | |
80 | /* Directory traversal attempt. */ | |
81 | static const char slashdot[4] = {'/', '.', '.', '/'}; | |
82 | if (__glibc_unlikely (__memmem (name, namelen, | |
83 | slashdot, sizeof (slashdot)) != NULL)) | |
84 | return 0; | |
85 | if (namelen == 2 && __glibc_unlikely (name[0] == '.' && name [1] == '.')) | |
86 | return 0; | |
87 | if (namelen >= 3 | |
88 | && __glibc_unlikely (((name[0] == '.' | |
89 | && name[1] == '.' | |
90 | && name[2] == '/') | |
91 | || (name[namelen - 3] == '/' | |
92 | && name[namelen - 2] == '.' | |
93 | && name[namelen - 1] == '.')))) | |
94 | return 0; | |
95 | /* If there is a slash in the name, it must start with one. */ | |
96 | if (__glibc_unlikely (memchr (name, '/', namelen) != NULL) && name[0] != '/') | |
97 | return 0; | |
98 | return 1; | |
99 | } | |
100 | ||
101 | struct __locale_data * | |
102 | _nl_find_locale (const char *locale_path, size_t locale_path_len, | |
103 | int category, const char **name) | |
104 | { | |
105 | int mask; | |
106 | /* Name of the locale for this category. */ | |
107 | const char *cloc_name = *name; | |
108 | const char *language; | |
109 | const char *modifier; | |
110 | const char *territory; | |
111 | const char *codeset; | |
112 | const char *normalized_codeset; | |
113 | struct loaded_l10nfile *locale_file; | |
114 | ||
115 | if (cloc_name[0] == '\0') | |
116 | { | |
117 | /* The user decides which locale to use by setting environment | |
118 | variables. */ | |
119 | cloc_name = getenv ("LC_ALL"); | |
120 | if (!name_present (cloc_name)) | |
121 | cloc_name = getenv (_nl_category_names.str | |
122 | + _nl_category_name_idxs[category]); | |
123 | if (!name_present (cloc_name)) | |
124 | cloc_name = getenv ("LANG"); | |
125 | if (!name_present (cloc_name)) | |
126 | cloc_name = _nl_C_name; | |
127 | } | |
128 | ||
129 | /* We used to fall back to the C locale if the name contains a slash | |
130 | character '/', but we now check for directory traversal in | |
131 | valid_locale_name, so this is no longer necessary. */ | |
132 | ||
133 | if (__builtin_expect (strcmp (cloc_name, _nl_C_name), 1) == 0 | |
134 | || __builtin_expect (strcmp (cloc_name, _nl_POSIX_name), 1) == 0) | |
135 | { | |
136 | /* We need not load anything. The needed data is contained in | |
137 | the library itself. */ | |
138 | *name = _nl_C_name; | |
139 | return _nl_C[category]; | |
140 | } | |
141 | else if (!valid_locale_name (cloc_name)) | |
142 | { | |
143 | __set_errno (EINVAL); | |
144 | return NULL; | |
145 | } | |
146 | ||
147 | *name = cloc_name; | |
148 | ||
149 | /* We really have to load some data. First we try the archive, | |
150 | but only if there was no LOCPATH environment variable specified. */ | |
151 | if (__glibc_likely (locale_path == NULL)) | |
152 | { | |
153 | struct __locale_data *data | |
154 | = _nl_load_locale_from_archive (category, name); | |
155 | if (__glibc_likely (data != NULL)) | |
156 | return data; | |
157 | ||
158 | /* Nothing in the archive with the given name. Expanding it as | |
159 | an alias and retry. */ | |
160 | cloc_name = _nl_expand_alias (*name); | |
161 | if (cloc_name != NULL) | |
162 | { | |
163 | data = _nl_load_locale_from_archive (category, &cloc_name); | |
164 | if (__builtin_expect (data != NULL, 1)) | |
165 | return data; | |
166 | } | |
167 | ||
168 | /* Nothing in the archive. Set the default path to search below. */ | |
169 | locale_path = _nl_default_locale_path; | |
170 | locale_path_len = sizeof _nl_default_locale_path; | |
171 | } | |
172 | else | |
173 | /* We really have to load some data. First see whether the name is | |
174 | an alias. Please note that this makes it impossible to have "C" | |
175 | or "POSIX" as aliases. */ | |
176 | cloc_name = _nl_expand_alias (*name); | |
177 | ||
178 | if (cloc_name == NULL) | |
179 | /* It is no alias. */ | |
180 | cloc_name = *name; | |
181 | ||
182 | /* Make a writable copy of the locale name. */ | |
183 | char *loc_name = strdupa (cloc_name); | |
184 | ||
185 | /* LOCALE can consist of up to four recognized parts for the XPG syntax: | |
186 | ||
187 | language[_territory[.codeset]][@modifier] | |
188 | ||
189 | Beside the first all of them are allowed to be missing. If the | |
190 | full specified locale is not found, the less specific one are | |
191 | looked for. The various part will be stripped off according to | |
192 | the following order: | |
193 | (1) codeset | |
194 | (2) normalized codeset | |
195 | (3) territory | |
196 | (4) modifier | |
197 | */ | |
198 | mask = _nl_explode_name (loc_name, &language, &modifier, &territory, | |
199 | &codeset, &normalized_codeset); | |
200 | if (mask == -1) | |
201 | /* Memory allocate problem. */ | |
202 | return NULL; | |
203 | ||
204 | /* If exactly this locale was already asked for we have an entry with | |
205 | the complete name. */ | |
206 | locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category], | |
207 | locale_path, locale_path_len, mask, | |
208 | language, territory, codeset, | |
209 | normalized_codeset, modifier, | |
210 | _nl_category_names.str | |
211 | + _nl_category_name_idxs[category], 0); | |
212 | ||
213 | if (locale_file == NULL) | |
214 | { | |
215 | /* Find status record for addressed locale file. We have to search | |
216 | through all directories in the locale path. */ | |
217 | locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category], | |
218 | locale_path, locale_path_len, mask, | |
219 | language, territory, codeset, | |
220 | normalized_codeset, modifier, | |
221 | _nl_category_names.str | |
222 | + _nl_category_name_idxs[category], 1); | |
223 | if (locale_file == NULL) | |
224 | /* This means we are out of core. */ | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | /* The space for normalized_codeset is dynamically allocated. Free it. */ | |
229 | if (mask & XPG_NORM_CODESET) | |
230 | free ((void *) normalized_codeset); | |
231 | ||
232 | if (locale_file->decided == 0) | |
233 | _nl_load_locale (locale_file, category); | |
234 | ||
235 | if (locale_file->data == NULL) | |
236 | { | |
237 | int cnt; | |
238 | for (cnt = 0; locale_file->successor[cnt] != NULL; ++cnt) | |
239 | { | |
240 | if (locale_file->successor[cnt]->decided == 0) | |
241 | _nl_load_locale (locale_file->successor[cnt], category); | |
242 | if (locale_file->successor[cnt]->data != NULL) | |
243 | break; | |
244 | } | |
245 | /* Move the entry we found (or NULL) to the first place of | |
246 | successors. */ | |
247 | locale_file->successor[0] = locale_file->successor[cnt]; | |
248 | locale_file = locale_file->successor[cnt]; | |
249 | ||
250 | if (locale_file == NULL) | |
251 | return NULL; | |
252 | } | |
253 | ||
254 | /* The LC_CTYPE category allows to check whether a locale is really | |
255 | usable. If the locale name contains a charset name and the | |
256 | charset name used in the locale (present in the LC_CTYPE data) is | |
257 | not the same (after resolving aliases etc) we reject the locale | |
258 | since using it would irritate users expecting the charset named | |
259 | in the locale name. */ | |
260 | if (codeset != NULL) | |
261 | { | |
262 | /* Get the codeset information from the locale file. */ | |
263 | static const int codeset_idx[] = | |
264 | { | |
265 | [__LC_CTYPE] = _NL_ITEM_INDEX (CODESET), | |
266 | [__LC_NUMERIC] = _NL_ITEM_INDEX (_NL_NUMERIC_CODESET), | |
267 | [__LC_TIME] = _NL_ITEM_INDEX (_NL_TIME_CODESET), | |
268 | [__LC_COLLATE] = _NL_ITEM_INDEX (_NL_COLLATE_CODESET), | |
269 | [__LC_MONETARY] = _NL_ITEM_INDEX (_NL_MONETARY_CODESET), | |
270 | [__LC_MESSAGES] = _NL_ITEM_INDEX (_NL_MESSAGES_CODESET), | |
271 | [__LC_PAPER] = _NL_ITEM_INDEX (_NL_PAPER_CODESET), | |
272 | [__LC_NAME] = _NL_ITEM_INDEX (_NL_NAME_CODESET), | |
273 | [__LC_ADDRESS] = _NL_ITEM_INDEX (_NL_ADDRESS_CODESET), | |
274 | [__LC_TELEPHONE] = _NL_ITEM_INDEX (_NL_TELEPHONE_CODESET), | |
275 | [__LC_MEASUREMENT] = _NL_ITEM_INDEX (_NL_MEASUREMENT_CODESET), | |
276 | [__LC_IDENTIFICATION] = _NL_ITEM_INDEX (_NL_IDENTIFICATION_CODESET) | |
277 | }; | |
278 | const struct __locale_data *data; | |
279 | const char *locale_codeset; | |
280 | char *clocale_codeset; | |
281 | char *ccodeset; | |
282 | ||
283 | data = (const struct __locale_data *) locale_file->data; | |
284 | locale_codeset = | |
285 | (const char *) data->values[codeset_idx[category]].string; | |
286 | assert (locale_codeset != NULL); | |
287 | /* Note the length of the allocated memory: +3 for up to two slashes | |
288 | and the NUL byte. */ | |
289 | clocale_codeset = (char *) alloca (strlen (locale_codeset) + 3); | |
290 | strip (clocale_codeset, locale_codeset); | |
291 | ||
292 | ccodeset = (char *) alloca (strlen (codeset) + 3); | |
293 | strip (ccodeset, codeset); | |
294 | ||
295 | if (__gconv_compare_alias (upstr (ccodeset, ccodeset), | |
296 | upstr (clocale_codeset, | |
297 | clocale_codeset)) != 0) | |
298 | /* The codesets are not identical, don't use the locale. */ | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | /* Determine the locale name for which loading succeeded. This | |
303 | information comes from the file name. The form is | |
304 | <path>/<locale>/LC_foo. We must extract the <locale> part. */ | |
305 | if (((const struct __locale_data *) locale_file->data)->name == NULL) | |
306 | { | |
307 | char *cp, *endp; | |
308 | ||
309 | endp = strrchr (locale_file->filename, '/'); | |
310 | cp = endp - 1; | |
311 | while (cp[-1] != '/') | |
312 | --cp; | |
313 | ((struct __locale_data *) locale_file->data)->name | |
314 | = __strndup (cp, endp - cp); | |
315 | } | |
316 | ||
317 | /* Determine whether the user wants transliteration or not. */ | |
318 | if (modifier != NULL | |
319 | && __strcasecmp_l (modifier, "TRANSLIT", _nl_C_locobj_ptr) == 0) | |
320 | ((struct __locale_data *) locale_file->data)->use_translit = 1; | |
321 | ||
322 | /* Increment the usage count. */ | |
323 | if (((const struct __locale_data *) locale_file->data)->usage_count | |
324 | < MAX_USAGE_COUNT) | |
325 | ++((struct __locale_data *) locale_file->data)->usage_count; | |
326 | ||
327 | return (struct __locale_data *) locale_file->data; | |
328 | } | |
329 | ||
330 | ||
331 | /* Calling this function assumes the lock for handling global locale data | |
332 | is acquired. */ | |
333 | void | |
334 | _nl_remove_locale (int locale, struct __locale_data *data) | |
335 | { | |
336 | if (--data->usage_count == 0) | |
337 | { | |
338 | if (data->alloc != ld_archive) | |
339 | { | |
340 | /* First search the entry in the list of loaded files. */ | |
341 | struct loaded_l10nfile *ptr = _nl_locale_file_list[locale]; | |
342 | ||
343 | /* Search for the entry. It must be in the list. Otherwise it | |
344 | is a bug and we crash badly. */ | |
345 | while ((struct __locale_data *) ptr->data != data) | |
346 | ptr = ptr->next; | |
347 | ||
348 | /* Mark the data as not available anymore. So when the data has | |
349 | to be used again it is reloaded. */ | |
350 | ptr->decided = 0; | |
351 | ptr->data = NULL; | |
352 | } | |
353 | ||
354 | /* This does the real work. */ | |
355 | _nl_unload_locale (data); | |
356 | } | |
357 | } |