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d614a753 | 1 | /* Copyright (C) 1996-2020 Free Software Foundation, Inc. |
e4cf5070 | 2 | This file is part of the GNU C Library. |
4b10dd6c | 3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
7a12c6bb | 4 | |
e4cf5070 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
7a12c6bb | 9 | |
e4cf5070 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
7a12c6bb | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
7a12c6bb | 18 | |
e7f21fa6 | 19 | #include <assert.h> |
4e8f95a0 | 20 | #include <errno.h> |
7a12c6bb RM |
21 | #include <locale.h> |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
3081378b | 24 | #include <unistd.h> |
72c74375 UD |
25 | #ifdef _POSIX_MAPPED_FILES |
26 | # include <sys/mman.h> | |
27 | #endif | |
7a12c6bb RM |
28 | |
29 | #include "localeinfo.h" | |
e7f21fa6 | 30 | #include "../iconv/gconv_charset.h" |
dd9423a6 | 31 | #include "../iconv/gconv_int.h" |
7a12c6bb RM |
32 | |
33 | ||
9a411bf5 RM |
34 | #ifdef NL_CURRENT_INDIRECT |
35 | # define DEFINE_CATEGORY(category, category_name, items, a) \ | |
f095bb72 | 36 | extern struct __locale_data _nl_C_##category; \ |
9a411bf5 RM |
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. */ | |
f095bb72 | 43 | struct __locale_data *const _nl_C[] attribute_hidden = |
9a411bf5 RM |
44 | { |
45 | # define DEFINE_CATEGORY(category, category_name, items, a) \ | |
46 | [category] = &_nl_C_##category, | |
47 | # include "categories.def" | |
48 | # undef DEFINE_CATEGORY | |
49 | }; | |
30c14c31 RM |
50 | #else |
51 | # define _nl_C (_nl_C_locobj.__locales) | |
52 | #endif | |
7a12c6bb RM |
53 | |
54 | ||
55 | /* For each category we keep a list of records for the locale files | |
56 | which are somehow addressed. */ | |
5746ef6f | 57 | struct loaded_l10nfile *_nl_locale_file_list[__LC_LAST]; |
7a12c6bb | 58 | |
90fe682d | 59 | const char _nl_default_locale_path[] attribute_hidden = COMPLOCALEDIR; |
cb09a2cd | 60 | |
4e8f95a0 FW |
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] = {'/', '.', '.', '/'}; | |
9975e3d3 JM |
82 | if (__glibc_unlikely (__memmem (name, namelen, |
83 | slashdot, sizeof (slashdot)) != NULL)) | |
4e8f95a0 FW |
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 | } | |
7a12c6bb | 100 | |
f095bb72 | 101 | struct __locale_data * |
7a12c6bb | 102 | _nl_find_locale (const char *locale_path, size_t locale_path_len, |
c84142e8 | 103 | int category, const char **name) |
7a12c6bb RM |
104 | { |
105 | int mask; | |
106 | /* Name of the locale for this category. */ | |
e7f07af5 | 107 | const char *cloc_name = *name; |
7a12c6bb RM |
108 | const char *language; |
109 | const char *modifier; | |
110 | const char *territory; | |
111 | const char *codeset; | |
112 | const char *normalized_codeset; | |
7a12c6bb RM |
113 | struct loaded_l10nfile *locale_file; |
114 | ||
e7f07af5 | 115 | if (cloc_name[0] == '\0') |
7a12c6bb RM |
116 | { |
117 | /* The user decides which locale to use by setting environment | |
118 | variables. */ | |
e7f07af5 AO |
119 | cloc_name = getenv ("LC_ALL"); |
120 | if (!name_present (cloc_name)) | |
de18a706 | 121 | cloc_name = getenv (_nl_category_names_get (category)); |
e7f07af5 AO |
122 | if (!name_present (cloc_name)) |
123 | cloc_name = getenv ("LANG"); | |
124 | if (!name_present (cloc_name)) | |
125 | cloc_name = _nl_C_name; | |
7a12c6bb RM |
126 | } |
127 | ||
4e8f95a0 FW |
128 | /* We used to fall back to the C locale if the name contains a slash |
129 | character '/', but we now check for directory traversal in | |
130 | valid_locale_name, so this is no longer necessary. */ | |
63336471 | 131 | |
e7f07af5 AO |
132 | if (__builtin_expect (strcmp (cloc_name, _nl_C_name), 1) == 0 |
133 | || __builtin_expect (strcmp (cloc_name, _nl_POSIX_name), 1) == 0) | |
7a12c6bb RM |
134 | { |
135 | /* We need not load anything. The needed data is contained in | |
136 | the library itself. */ | |
e7f07af5 | 137 | *name = _nl_C_name; |
7a12c6bb RM |
138 | return _nl_C[category]; |
139 | } | |
e7f07af5 | 140 | else if (!valid_locale_name (cloc_name)) |
4e8f95a0 FW |
141 | { |
142 | __set_errno (EINVAL); | |
143 | return NULL; | |
144 | } | |
145 | ||
e7f07af5 | 146 | *name = cloc_name; |
7a12c6bb | 147 | |
cb09a2cd RM |
148 | /* We really have to load some data. First we try the archive, |
149 | but only if there was no LOCPATH environment variable specified. */ | |
a1ffb40e | 150 | if (__glibc_likely (locale_path == NULL)) |
cb09a2cd | 151 | { |
f095bb72 UD |
152 | struct __locale_data *data |
153 | = _nl_load_locale_from_archive (category, name); | |
a1ffb40e | 154 | if (__glibc_likely (data != NULL)) |
cb09a2cd RM |
155 | return data; |
156 | ||
0d822a01 AO |
157 | /* Nothing in the archive with the given name. Expanding it as |
158 | an alias and retry. */ | |
e7f07af5 AO |
159 | cloc_name = _nl_expand_alias (*name); |
160 | if (cloc_name != NULL) | |
0d822a01 | 161 | { |
e7f07af5 | 162 | data = _nl_load_locale_from_archive (category, &cloc_name); |
0d822a01 AO |
163 | if (__builtin_expect (data != NULL, 1)) |
164 | return data; | |
165 | } | |
166 | ||
cb09a2cd RM |
167 | /* Nothing in the archive. Set the default path to search below. */ |
168 | locale_path = _nl_default_locale_path; | |
169 | locale_path_len = sizeof _nl_default_locale_path; | |
170 | } | |
0d822a01 AO |
171 | else |
172 | /* We really have to load some data. First see whether the name is | |
173 | an alias. Please note that this makes it impossible to have "C" | |
174 | or "POSIX" as aliases. */ | |
e7f07af5 | 175 | cloc_name = _nl_expand_alias (*name); |
cb09a2cd | 176 | |
e7f07af5 | 177 | if (cloc_name == NULL) |
7a12c6bb | 178 | /* It is no alias. */ |
e7f07af5 | 179 | cloc_name = *name; |
7a12c6bb RM |
180 | |
181 | /* Make a writable copy of the locale name. */ | |
e7f07af5 | 182 | char *loc_name = strdupa (cloc_name); |
7a12c6bb RM |
183 | |
184 | /* LOCALE can consist of up to four recognized parts for the XPG syntax: | |
185 | ||
186 | language[_territory[.codeset]][@modifier] | |
187 | ||
7a12c6bb RM |
188 | Beside the first all of them are allowed to be missing. If the |
189 | full specified locale is not found, the less specific one are | |
cb09a2cd | 190 | looked for. The various part will be stripped off according to |
7a12c6bb | 191 | the following order: |
e155c801 UD |
192 | (1) codeset |
193 | (2) normalized codeset | |
194 | (3) territory | |
195 | (4) modifier | |
7a12c6bb RM |
196 | */ |
197 | mask = _nl_explode_name (loc_name, &language, &modifier, &territory, | |
e155c801 | 198 | &codeset, &normalized_codeset); |
4f031072 UD |
199 | if (mask == -1) |
200 | /* Memory allocate problem. */ | |
201 | return NULL; | |
7a12c6bb RM |
202 | |
203 | /* If exactly this locale was already asked for we have an entry with | |
204 | the complete name. */ | |
5746ef6f | 205 | locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category], |
7a12c6bb RM |
206 | locale_path, locale_path_len, mask, |
207 | language, territory, codeset, | |
e155c801 | 208 | normalized_codeset, modifier, |
de18a706 | 209 | _nl_category_names_get (category), 0); |
7a12c6bb RM |
210 | |
211 | if (locale_file == NULL) | |
212 | { | |
213 | /* Find status record for addressed locale file. We have to search | |
214 | through all directories in the locale path. */ | |
5746ef6f | 215 | locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category], |
7a12c6bb RM |
216 | locale_path, locale_path_len, mask, |
217 | language, territory, codeset, | |
e155c801 | 218 | normalized_codeset, modifier, |
de18a706 | 219 | _nl_category_names_get (category), 1); |
7a12c6bb RM |
220 | if (locale_file == NULL) |
221 | /* This means we are out of core. */ | |
222 | return NULL; | |
223 | } | |
7a12c6bb | 224 | |
727211c4 UD |
225 | /* The space for normalized_codeset is dynamically allocated. Free it. */ |
226 | if (mask & XPG_NORM_CODESET) | |
227 | free ((void *) normalized_codeset); | |
228 | ||
7a12c6bb RM |
229 | if (locale_file->decided == 0) |
230 | _nl_load_locale (locale_file, category); | |
231 | ||
232 | if (locale_file->data == NULL) | |
233 | { | |
234 | int cnt; | |
235 | for (cnt = 0; locale_file->successor[cnt] != NULL; ++cnt) | |
236 | { | |
237 | if (locale_file->successor[cnt]->decided == 0) | |
238 | _nl_load_locale (locale_file->successor[cnt], category); | |
239 | if (locale_file->successor[cnt]->data != NULL) | |
240 | break; | |
241 | } | |
242 | /* Move the entry we found (or NULL) to the first place of | |
243 | successors. */ | |
244 | locale_file->successor[0] = locale_file->successor[cnt]; | |
245 | locale_file = locale_file->successor[cnt]; | |
7a12c6bb | 246 | |
3a31f6f4 UD |
247 | if (locale_file == NULL) |
248 | return NULL; | |
249 | } | |
7a12c6bb | 250 | |
e7f21fa6 UD |
251 | /* The LC_CTYPE category allows to check whether a locale is really |
252 | usable. If the locale name contains a charset name and the | |
253 | charset name used in the locale (present in the LC_CTYPE data) is | |
254 | not the same (after resolving aliases etc) we reject the locale | |
255 | since using it would irritate users expecting the charset named | |
256 | in the locale name. */ | |
257 | if (codeset != NULL) | |
258 | { | |
259 | /* Get the codeset information from the locale file. */ | |
260 | static const int codeset_idx[] = | |
261 | { | |
262 | [__LC_CTYPE] = _NL_ITEM_INDEX (CODESET), | |
263 | [__LC_NUMERIC] = _NL_ITEM_INDEX (_NL_NUMERIC_CODESET), | |
264 | [__LC_TIME] = _NL_ITEM_INDEX (_NL_TIME_CODESET), | |
265 | [__LC_COLLATE] = _NL_ITEM_INDEX (_NL_COLLATE_CODESET), | |
266 | [__LC_MONETARY] = _NL_ITEM_INDEX (_NL_MONETARY_CODESET), | |
267 | [__LC_MESSAGES] = _NL_ITEM_INDEX (_NL_MESSAGES_CODESET), | |
268 | [__LC_PAPER] = _NL_ITEM_INDEX (_NL_PAPER_CODESET), | |
269 | [__LC_NAME] = _NL_ITEM_INDEX (_NL_NAME_CODESET), | |
270 | [__LC_ADDRESS] = _NL_ITEM_INDEX (_NL_ADDRESS_CODESET), | |
271 | [__LC_TELEPHONE] = _NL_ITEM_INDEX (_NL_TELEPHONE_CODESET), | |
272 | [__LC_MEASUREMENT] = _NL_ITEM_INDEX (_NL_MEASUREMENT_CODESET), | |
273 | [__LC_IDENTIFICATION] = _NL_ITEM_INDEX (_NL_IDENTIFICATION_CODESET) | |
274 | }; | |
f095bb72 | 275 | const struct __locale_data *data; |
e7f21fa6 UD |
276 | const char *locale_codeset; |
277 | char *clocale_codeset; | |
278 | char *ccodeset; | |
279 | ||
f095bb72 | 280 | data = (const struct __locale_data *) locale_file->data; |
e7f21fa6 UD |
281 | locale_codeset = |
282 | (const char *) data->values[codeset_idx[category]].string; | |
283 | assert (locale_codeset != NULL); | |
284 | /* Note the length of the allocated memory: +3 for up to two slashes | |
285 | and the NUL byte. */ | |
286 | clocale_codeset = (char *) alloca (strlen (locale_codeset) + 3); | |
287 | strip (clocale_codeset, locale_codeset); | |
288 | ||
289 | ccodeset = (char *) alloca (strlen (codeset) + 3); | |
290 | strip (ccodeset, codeset); | |
291 | ||
9a018f6c UD |
292 | if (__gconv_compare_alias (upstr (ccodeset, ccodeset), |
293 | upstr (clocale_codeset, | |
294 | clocale_codeset)) != 0) | |
e7f21fa6 UD |
295 | /* The codesets are not identical, don't use the locale. */ |
296 | return NULL; | |
297 | } | |
298 | ||
7a12c6bb RM |
299 | /* Determine the locale name for which loading succeeded. This |
300 | information comes from the file name. The form is | |
036cc82f | 301 | <path>/<locale>/LC_foo. We must extract the <locale> part. */ |
f095bb72 | 302 | if (((const struct __locale_data *) locale_file->data)->name == NULL) |
7a12c6bb | 303 | { |
036cc82f | 304 | char *cp, *endp; |
7a12c6bb RM |
305 | |
306 | endp = strrchr (locale_file->filename, '/'); | |
307 | cp = endp - 1; | |
308 | while (cp[-1] != '/') | |
309 | --cp; | |
f095bb72 UD |
310 | ((struct __locale_data *) locale_file->data)->name |
311 | = __strndup (cp, endp - cp); | |
7a12c6bb | 312 | } |
7a12c6bb | 313 | |
323fb88d | 314 | /* Determine whether the user wants transliteration or not. */ |
5f078c32 UD |
315 | if (modifier != NULL |
316 | && __strcasecmp_l (modifier, "TRANSLIT", _nl_C_locobj_ptr) == 0) | |
f095bb72 | 317 | ((struct __locale_data *) locale_file->data)->use_translit = 1; |
323fb88d | 318 | |
c84142e8 | 319 | /* Increment the usage count. */ |
f095bb72 | 320 | if (((const struct __locale_data *) locale_file->data)->usage_count |
a5a0310d | 321 | < MAX_USAGE_COUNT) |
f095bb72 | 322 | ++((struct __locale_data *) locale_file->data)->usage_count; |
c84142e8 | 323 | |
f095bb72 | 324 | return (struct __locale_data *) locale_file->data; |
7a12c6bb | 325 | } |
c84142e8 UD |
326 | |
327 | ||
328 | /* Calling this function assumes the lock for handling global locale data | |
329 | is acquired. */ | |
330 | void | |
f095bb72 | 331 | _nl_remove_locale (int locale, struct __locale_data *data) |
c84142e8 UD |
332 | { |
333 | if (--data->usage_count == 0) | |
334 | { | |
0f283ffc | 335 | if (data->alloc != ld_archive) |
c84142e8 | 336 | { |
0f283ffc RM |
337 | /* First search the entry in the list of loaded files. */ |
338 | struct loaded_l10nfile *ptr = _nl_locale_file_list[locale]; | |
339 | ||
340 | /* Search for the entry. It must be in the list. Otherwise it | |
341 | is a bug and we crash badly. */ | |
f095bb72 | 342 | while ((struct __locale_data *) ptr->data != data) |
0f283ffc RM |
343 | ptr = ptr->next; |
344 | ||
345 | /* Mark the data as not available anymore. So when the data has | |
346 | to be used again it is reloaded. */ | |
347 | ptr->decided = 0; | |
348 | ptr->data = NULL; | |
c84142e8 | 349 | } |
c84142e8 | 350 | |
0f283ffc RM |
351 | /* This does the real work. */ |
352 | _nl_unload_locale (data); | |
c84142e8 UD |
353 | } |
354 | } |