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Commit | Line | Data |
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d614a753 | 1 | /* Copyright (C) 1996-2020 Free Software Foundation, Inc. |
6259ec0d | 2 | This file is part of the GNU C Library. |
b85697f6 | 3 | Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996. |
6259ec0d UD |
4 | |
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. | |
6259ec0d UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6259ec0d | 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/>. */ |
6259ec0d | 18 | |
1aa43890 | 19 | #include <ctype.h> |
6259ec0d | 20 | #include <errno.h> |
3996f34b | 21 | #include <fcntl.h> |
6259ec0d | 22 | #include <grp.h> |
1aa43890 UD |
23 | #include <nss.h> |
24 | #include <nsswitch.h> | |
b4431a72 | 25 | #include <stdio_ext.h> |
6259ec0d | 26 | #include <string.h> |
ec999b8e | 27 | #include <libc-lock.h> |
cc783763 | 28 | #include <kernel-features.h> |
26dee9c4 | 29 | |
fc9f33e3 | 30 | static service_user *ni; |
1e2e27fd UD |
31 | static enum nss_status (*nss_setgrent) (int stayopen); |
32 | static enum nss_status (*nss_getgrnam_r) (const char *name, | |
33 | struct group * grp, char *buffer, | |
34 | size_t buflen, int *errnop); | |
35 | static enum nss_status (*nss_getgrgid_r) (gid_t gid, struct group * grp, | |
36 | char *buffer, size_t buflen, | |
37 | int *errnop); | |
38 | static enum nss_status (*nss_getgrent_r) (struct group * grp, char *buffer, | |
39 | size_t buflen, int *errnop); | |
40 | static enum nss_status (*nss_endgrent) (void); | |
6259ec0d | 41 | |
7e3be507 UD |
42 | /* Get the declaration of the parser function. */ |
43 | #define ENTNAME grent | |
44 | #define STRUCTURE group | |
45 | #define EXTERN_PARSER | |
cc3fa755 | 46 | #include <nss/nss_files/files-parse.c> |
7e3be507 | 47 | |
26dee9c4 | 48 | /* Structure for remembering -group members ... */ |
6259ec0d UD |
49 | #define BLACKLIST_INITIAL_SIZE 512 |
50 | #define BLACKLIST_INCREMENT 256 | |
51 | struct blacklist_t | |
1e2e27fd UD |
52 | { |
53 | char *data; | |
54 | int current; | |
55 | int size; | |
56 | }; | |
6259ec0d UD |
57 | |
58 | struct ent_t | |
1e2e27fd | 59 | { |
64d1e08e | 60 | bool files; |
cb62745a | 61 | enum nss_status setent_status; |
1e2e27fd UD |
62 | FILE *stream; |
63 | struct blacklist_t blacklist; | |
26dee9c4 | 64 | }; |
6259ec0d UD |
65 | typedef struct ent_t ent_t; |
66 | ||
64d1e08e | 67 | static ent_t ext_ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }}; |
6259ec0d UD |
68 | |
69 | /* Protect global state against multiple changers. */ | |
70 | __libc_lock_define_initialized (static, lock) | |
71 | ||
72 | /* Prototypes for local functions. */ | |
73 | static void blacklist_store_name (const char *, ent_t *); | |
64d1e08e | 74 | static bool in_blacklist (const char *, int, ent_t *); |
2d7da676 | 75 | |
1e2e27fd UD |
76 | /* Initialize the NSS interface/functions. The calling function must |
77 | hold the lock. */ | |
78 | static void | |
79 | init_nss_interface (void) | |
2d7da676 | 80 | { |
a9368c34 | 81 | if (__nss_database_lookup2 ("group_compat", NULL, "nis", &ni) >= 0) |
2d7da676 | 82 | { |
1e2e27fd UD |
83 | nss_setgrent = __nss_lookup_function (ni, "setgrent"); |
84 | nss_getgrnam_r = __nss_lookup_function (ni, "getgrnam_r"); | |
85 | nss_getgrgid_r = __nss_lookup_function (ni, "getgrgid_r"); | |
86 | nss_getgrent_r = __nss_lookup_function (ni, "getgrent_r"); | |
87 | nss_endgrent = __nss_lookup_function (ni, "endgrent"); | |
2d7da676 | 88 | } |
2d7da676 | 89 | } |
6259ec0d UD |
90 | |
91 | static enum nss_status | |
cb62745a | 92 | internal_setgrent (ent_t *ent, int stayopen, int needent) |
6259ec0d UD |
93 | { |
94 | enum nss_status status = NSS_STATUS_SUCCESS; | |
95 | ||
64d1e08e | 96 | ent->files = true; |
c131718c | 97 | |
6259ec0d | 98 | if (ent->blacklist.data != NULL) |
bd355af0 UD |
99 | { |
100 | ent->blacklist.current = 1; | |
101 | ent->blacklist.data[0] = '|'; | |
102 | ent->blacklist.data[1] = '\0'; | |
103 | } | |
104 | else | |
105 | ent->blacklist.current = 0; | |
c131718c | 106 | |
6259ec0d UD |
107 | if (ent->stream == NULL) |
108 | { | |
cc783763 | 109 | ent->stream = fopen ("/etc/group", "rme"); |
c131718c | 110 | |
6259ec0d UD |
111 | if (ent->stream == NULL) |
112 | status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL; | |
3996f34b | 113 | else |
cef9b653 FW |
114 | /* We take care of locking ourself. */ |
115 | __fsetlocking (ent->stream, FSETLOCKING_BYCALLER); | |
6259ec0d UD |
116 | } |
117 | else | |
118 | rewind (ent->stream); | |
119 | ||
cb62745a UD |
120 | if (needent && status == NSS_STATUS_SUCCESS && nss_setgrent) |
121 | ent->setent_status = nss_setgrent (stayopen); | |
1e2e27fd | 122 | |
6259ec0d UD |
123 | return status; |
124 | } | |
125 | ||
126 | ||
127 | enum nss_status | |
51eecc4a | 128 | _nss_compat_setgrent (int stayopen) |
6259ec0d UD |
129 | { |
130 | enum nss_status result; | |
131 | ||
132 | __libc_lock_lock (lock); | |
133 | ||
1e2e27fd UD |
134 | if (ni == NULL) |
135 | init_nss_interface (); | |
136 | ||
cb62745a | 137 | result = internal_setgrent (&ext_ent, stayopen, 1); |
6259ec0d UD |
138 | |
139 | __libc_lock_unlock (lock); | |
140 | ||
141 | return result; | |
142 | } | |
143 | ||
144 | ||
145 | static enum nss_status | |
146 | internal_endgrent (ent_t *ent) | |
147 | { | |
148 | if (ent->stream != NULL) | |
149 | { | |
150 | fclose (ent->stream); | |
151 | ent->stream = NULL; | |
152 | } | |
153 | ||
6259ec0d | 154 | if (ent->blacklist.data != NULL) |
bd355af0 UD |
155 | { |
156 | ent->blacklist.current = 1; | |
157 | ent->blacklist.data[0] = '|'; | |
158 | ent->blacklist.data[1] = '\0'; | |
159 | } | |
160 | else | |
161 | ent->blacklist.current = 0; | |
6259ec0d UD |
162 | |
163 | return NSS_STATUS_SUCCESS; | |
164 | } | |
165 | ||
166 | enum nss_status | |
167 | _nss_compat_endgrent (void) | |
168 | { | |
169 | enum nss_status result; | |
170 | ||
171 | __libc_lock_lock (lock); | |
172 | ||
b13b96ca AS |
173 | if (nss_endgrent) |
174 | nss_endgrent (); | |
175 | ||
6259ec0d UD |
176 | result = internal_endgrent (&ext_ent); |
177 | ||
178 | __libc_lock_unlock (lock); | |
179 | ||
180 | return result; | |
181 | } | |
182 | ||
1e2e27fd | 183 | /* get the next group from NSS (+ entry) */ |
6259ec0d | 184 | static enum nss_status |
1e2e27fd | 185 | getgrent_next_nss (struct group *result, ent_t *ent, char *buffer, |
d71b808a | 186 | size_t buflen, int *errnop) |
6259ec0d | 187 | { |
1e2e27fd UD |
188 | if (!nss_getgrent_r) |
189 | return NSS_STATUS_UNAVAIL; | |
c131718c | 190 | |
cb62745a UD |
191 | /* If the setgrent call failed, say so. */ |
192 | if (ent->setent_status != NSS_STATUS_SUCCESS) | |
193 | return ent->setent_status; | |
194 | ||
26dee9c4 UD |
195 | do |
196 | { | |
1e2e27fd | 197 | enum nss_status status; |
60c96635 | 198 | |
a04549c1 JM |
199 | if ((status = nss_getgrent_r (result, buffer, buflen, errnop)) |
200 | != NSS_STATUS_SUCCESS) | |
1e2e27fd | 201 | return status; |
26dee9c4 | 202 | } |
1e2e27fd | 203 | while (in_blacklist (result->gr_name, strlen (result->gr_name), ent)); |
c131718c | 204 | |
26dee9c4 UD |
205 | return NSS_STATUS_SUCCESS; |
206 | } | |
6259ec0d | 207 | |
26dee9c4 UD |
208 | /* This function handle the +group entrys in /etc/group */ |
209 | static enum nss_status | |
1e2e27fd UD |
210 | getgrnam_plusgroup (const char *name, struct group *result, ent_t *ent, |
211 | char *buffer, size_t buflen, int *errnop) | |
26dee9c4 | 212 | { |
1e2e27fd UD |
213 | if (!nss_getgrnam_r) |
214 | return NSS_STATUS_UNAVAIL; | |
6591c335 | 215 | |
016c70ea UD |
216 | enum nss_status status = nss_getgrnam_r (name, result, buffer, buflen, |
217 | errnop); | |
218 | if (status != NSS_STATUS_SUCCESS) | |
219 | return status; | |
6591c335 | 220 | |
1e2e27fd UD |
221 | if (in_blacklist (result->gr_name, strlen (result->gr_name), ent)) |
222 | return NSS_STATUS_NOTFOUND; | |
26dee9c4 | 223 | |
1e2e27fd UD |
224 | /* We found the entry. */ |
225 | return NSS_STATUS_SUCCESS; | |
6259ec0d UD |
226 | } |
227 | ||
6259ec0d UD |
228 | static enum nss_status |
229 | getgrent_next_file (struct group *result, ent_t *ent, | |
d71b808a | 230 | char *buffer, size_t buflen, int *errnop) |
6259ec0d | 231 | { |
7e3be507 | 232 | struct parser_data *data = (void *) buffer; |
6259ec0d UD |
233 | while (1) |
234 | { | |
60c96635 UD |
235 | fpos_t pos; |
236 | int parse_res = 0; | |
6259ec0d UD |
237 | char *p; |
238 | ||
239 | do | |
240 | { | |
20f8e666 | 241 | /* We need at least 3 characters for one line. */ |
a1ffb40e | 242 | if (__glibc_unlikely (buflen < 3)) |
20f8e666 UD |
243 | { |
244 | erange: | |
245 | *errnop = ERANGE; | |
246 | return NSS_STATUS_TRYAGAIN; | |
247 | } | |
248 | ||
60c96635 | 249 | fgetpos (ent->stream, &pos); |
af69217f | 250 | buffer[buflen - 1] = '\xff'; |
1aa43890 UD |
251 | p = fgets_unlocked (buffer, buflen, ent->stream); |
252 | if (p == NULL && feof_unlocked (ent->stream)) | |
34816665 UD |
253 | return NSS_STATUS_NOTFOUND; |
254 | ||
20f8e666 | 255 | if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0)) |
60c96635 | 256 | { |
20f8e666 | 257 | erange_reset: |
af69217f | 258 | fsetpos (ent->stream, &pos); |
20f8e666 | 259 | goto erange; |
60c96635 | 260 | } |
6259ec0d UD |
261 | |
262 | /* Terminate the line for any case. */ | |
263 | buffer[buflen - 1] = '\0'; | |
264 | ||
265 | /* Skip leading blanks. */ | |
266 | while (isspace (*p)) | |
267 | ++p; | |
268 | } | |
a04549c1 | 269 | while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ |
1e2e27fd UD |
270 | /* Parse the line. If it is invalid, loop to |
271 | get the next line of the file to parse. */ | |
a04549c1 JM |
272 | || !(parse_res = _nss_files_parse_grent (p, result, data, buflen, |
273 | errnop))); | |
60c96635 | 274 | |
a1ffb40e | 275 | if (__glibc_unlikely (parse_res == -1)) |
20f8e666 UD |
276 | /* The parser ran out of space. */ |
277 | goto erange_reset; | |
6259ec0d UD |
278 | |
279 | if (result->gr_name[0] != '+' && result->gr_name[0] != '-') | |
280 | /* This is a real entry. */ | |
281 | break; | |
282 | ||
283 | /* -group */ | |
284 | if (result->gr_name[0] == '-' && result->gr_name[1] != '\0' | |
285 | && result->gr_name[1] != '@') | |
286 | { | |
287 | blacklist_store_name (&result->gr_name[1], ent); | |
288 | continue; | |
289 | } | |
290 | ||
291 | /* +group */ | |
292 | if (result->gr_name[0] == '+' && result->gr_name[1] != '\0' | |
293 | && result->gr_name[1] != '@') | |
294 | { | |
bbca27a4 UD |
295 | size_t len = strlen (result->gr_name); |
296 | char buf[len]; | |
1e2e27fd | 297 | enum nss_status status; |
c131718c | 298 | |
51eecc4a | 299 | /* Store the group in the blacklist for the "+" at the end of |
cc3fa755 | 300 | /etc/group */ |
bbca27a4 | 301 | memcpy (buf, &result->gr_name[1], len); |
1e2e27fd UD |
302 | status = getgrnam_plusgroup (&result->gr_name[1], result, ent, |
303 | buffer, buflen, errnop); | |
bbca27a4 | 304 | blacklist_store_name (buf, ent); |
1e2e27fd UD |
305 | if (status == NSS_STATUS_SUCCESS) /* We found the entry. */ |
306 | break; | |
20f8e666 | 307 | else if (status == NSS_STATUS_RETURN /* We couldn't parse the entry*/ |
1e2e27fd UD |
308 | || status == NSS_STATUS_NOTFOUND) /* No group in NIS */ |
309 | continue; | |
310 | else | |
311 | { | |
312 | if (status == NSS_STATUS_TRYAGAIN) | |
20f8e666 UD |
313 | /* The parser ran out of space. */ |
314 | goto erange_reset; | |
315 | ||
1e2e27fd UD |
316 | return status; |
317 | } | |
6259ec0d UD |
318 | } |
319 | ||
320 | /* +:... */ | |
321 | if (result->gr_name[0] == '+' && result->gr_name[1] == '\0') | |
322 | { | |
64d1e08e | 323 | ent->files = false; |
6259ec0d | 324 | |
1e2e27fd | 325 | return getgrent_next_nss (result, ent, buffer, buflen, errnop); |
6259ec0d UD |
326 | } |
327 | } | |
328 | ||
329 | return NSS_STATUS_SUCCESS; | |
330 | } | |
331 | ||
332 | ||
6259ec0d | 333 | enum nss_status |
d71b808a UD |
334 | _nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen, |
335 | int *errnop) | |
6259ec0d | 336 | { |
1e2e27fd | 337 | enum nss_status result = NSS_STATUS_SUCCESS; |
6259ec0d UD |
338 | |
339 | __libc_lock_lock (lock); | |
340 | ||
341 | /* Be prepared that the setgrent function was not called before. */ | |
1e2e27fd UD |
342 | if (ni == NULL) |
343 | init_nss_interface (); | |
6259ec0d | 344 | |
1e2e27fd | 345 | if (ext_ent.stream == NULL) |
cb62745a | 346 | result = internal_setgrent (&ext_ent, 1, 1); |
6259ec0d | 347 | |
1e2e27fd UD |
348 | if (result == NSS_STATUS_SUCCESS) |
349 | { | |
350 | if (ext_ent.files) | |
351 | result = getgrent_next_file (grp, &ext_ent, buffer, buflen, errnop); | |
352 | else | |
353 | result = getgrent_next_nss (grp, &ext_ent, buffer, buflen, errnop); | |
354 | } | |
6259ec0d UD |
355 | __libc_lock_unlock (lock); |
356 | ||
1e2e27fd | 357 | return result; |
6259ec0d UD |
358 | } |
359 | ||
cc3fa755 UD |
360 | /* Searches in /etc/group and the NIS/NIS+ map for a special group */ |
361 | static enum nss_status | |
362 | internal_getgrnam_r (const char *name, struct group *result, ent_t *ent, | |
d71b808a | 363 | char *buffer, size_t buflen, int *errnop) |
cc3fa755 UD |
364 | { |
365 | struct parser_data *data = (void *) buffer; | |
366 | while (1) | |
367 | { | |
368 | fpos_t pos; | |
369 | int parse_res = 0; | |
370 | char *p; | |
371 | ||
372 | do | |
373 | { | |
20f8e666 | 374 | /* We need at least 3 characters for one line. */ |
a1ffb40e | 375 | if (__glibc_unlikely (buflen < 3)) |
20f8e666 UD |
376 | { |
377 | erange: | |
378 | *errnop = ERANGE; | |
379 | return NSS_STATUS_TRYAGAIN; | |
380 | } | |
381 | ||
cc3fa755 | 382 | fgetpos (ent->stream, &pos); |
af69217f | 383 | buffer[buflen - 1] = '\xff'; |
1aa43890 UD |
384 | p = fgets_unlocked (buffer, buflen, ent->stream); |
385 | if (p == NULL && feof_unlocked (ent->stream)) | |
1e2e27fd | 386 | return NSS_STATUS_NOTFOUND; |
34816665 | 387 | |
20f8e666 | 388 | if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0)) |
cc3fa755 | 389 | { |
20f8e666 | 390 | erange_reset: |
af69217f | 391 | fsetpos (ent->stream, &pos); |
20f8e666 | 392 | goto erange; |
cc3fa755 UD |
393 | } |
394 | ||
395 | /* Terminate the line for any case. */ | |
396 | buffer[buflen - 1] = '\0'; | |
397 | ||
398 | /* Skip leading blanks. */ | |
399 | while (isspace (*p)) | |
400 | ++p; | |
401 | } | |
a04549c1 | 402 | while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ |
1e2e27fd UD |
403 | /* Parse the line. If it is invalid, loop to |
404 | get the next line of the file to parse. */ | |
a04549c1 JM |
405 | || !(parse_res = _nss_files_parse_grent (p, result, data, buflen, |
406 | errnop))); | |
cc3fa755 | 407 | |
a1ffb40e | 408 | if (__glibc_unlikely (parse_res == -1)) |
20f8e666 UD |
409 | /* The parser ran out of space. */ |
410 | goto erange_reset; | |
cc3fa755 UD |
411 | |
412 | /* This is a real entry. */ | |
413 | if (result->gr_name[0] != '+' && result->gr_name[0] != '-') | |
414 | { | |
415 | if (strcmp (result->gr_name, name) == 0) | |
416 | return NSS_STATUS_SUCCESS; | |
417 | else | |
418 | continue; | |
419 | } | |
420 | ||
421 | /* -group */ | |
d71b808a | 422 | if (result->gr_name[0] == '-' && result->gr_name[1] != '\0') |
cc3fa755 UD |
423 | { |
424 | if (strcmp (&result->gr_name[1], name) == 0) | |
34816665 | 425 | return NSS_STATUS_NOTFOUND; |
cc3fa755 UD |
426 | else |
427 | continue; | |
428 | } | |
429 | ||
430 | /* +group */ | |
d71b808a | 431 | if (result->gr_name[0] == '+' && result->gr_name[1] != '\0') |
cc3fa755 UD |
432 | { |
433 | if (strcmp (name, &result->gr_name[1]) == 0) | |
434 | { | |
435 | enum nss_status status; | |
436 | ||
1e2e27fd UD |
437 | status = getgrnam_plusgroup (name, result, ent, |
438 | buffer, buflen, errnop); | |
cc3fa755 UD |
439 | if (status == NSS_STATUS_RETURN) |
440 | /* We couldn't parse the entry */ | |
441 | continue; | |
442 | else | |
443 | return status; | |
444 | } | |
445 | } | |
446 | /* +:... */ | |
447 | if (result->gr_name[0] == '+' && result->gr_name[1] == '\0') | |
448 | { | |
449 | enum nss_status status; | |
450 | ||
1e2e27fd UD |
451 | status = getgrnam_plusgroup (name, result, ent, |
452 | buffer, buflen, errnop); | |
cc3fa755 UD |
453 | if (status == NSS_STATUS_RETURN) |
454 | /* We couldn't parse the entry */ | |
455 | continue; | |
456 | else | |
457 | return status; | |
458 | } | |
459 | } | |
460 | ||
461 | return NSS_STATUS_SUCCESS; | |
462 | } | |
6259ec0d UD |
463 | |
464 | enum nss_status | |
465 | _nss_compat_getgrnam_r (const char *name, struct group *grp, | |
d71b808a | 466 | char *buffer, size_t buflen, int *errnop) |
6259ec0d | 467 | { |
64d1e08e | 468 | ent_t ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }}; |
1e2e27fd | 469 | enum nss_status result; |
6259ec0d UD |
470 | |
471 | if (name[0] == '-' || name[0] == '+') | |
34816665 | 472 | return NSS_STATUS_NOTFOUND; |
6259ec0d | 473 | |
26dee9c4 UD |
474 | __libc_lock_lock (lock); |
475 | ||
1e2e27fd UD |
476 | if (ni == NULL) |
477 | init_nss_interface (); | |
c131718c | 478 | |
26dee9c4 | 479 | __libc_lock_unlock (lock); |
6259ec0d | 480 | |
cb62745a | 481 | result = internal_setgrent (&ent, 0, 0); |
6259ec0d | 482 | |
1e2e27fd UD |
483 | if (result == NSS_STATUS_SUCCESS) |
484 | result = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop); | |
6259ec0d UD |
485 | |
486 | internal_endgrent (&ent); | |
cc3fa755 | 487 | |
1e2e27fd | 488 | return result; |
cc3fa755 UD |
489 | } |
490 | ||
491 | /* Searches in /etc/group and the NIS/NIS+ map for a special group id */ | |
492 | static enum nss_status | |
493 | internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent, | |
d71b808a | 494 | char *buffer, size_t buflen, int *errnop) |
cc3fa755 UD |
495 | { |
496 | struct parser_data *data = (void *) buffer; | |
497 | while (1) | |
498 | { | |
499 | fpos_t pos; | |
500 | int parse_res = 0; | |
501 | char *p; | |
502 | ||
503 | do | |
504 | { | |
20f8e666 | 505 | /* We need at least 3 characters for one line. */ |
a1ffb40e | 506 | if (__glibc_unlikely (buflen < 3)) |
20f8e666 UD |
507 | { |
508 | erange: | |
509 | *errnop = ERANGE; | |
510 | return NSS_STATUS_TRYAGAIN; | |
511 | } | |
512 | ||
cc3fa755 | 513 | fgetpos (ent->stream, &pos); |
af69217f | 514 | buffer[buflen - 1] = '\xff'; |
1aa43890 UD |
515 | p = fgets_unlocked (buffer, buflen, ent->stream); |
516 | if (p == NULL && feof_unlocked (ent->stream)) | |
34816665 UD |
517 | return NSS_STATUS_NOTFOUND; |
518 | ||
20f8e666 | 519 | if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0)) |
cc3fa755 | 520 | { |
20f8e666 | 521 | erange_reset: |
af69217f | 522 | fsetpos (ent->stream, &pos); |
20f8e666 | 523 | goto erange; |
cc3fa755 UD |
524 | } |
525 | ||
526 | /* Terminate the line for any case. */ | |
527 | buffer[buflen - 1] = '\0'; | |
528 | ||
529 | /* Skip leading blanks. */ | |
530 | while (isspace (*p)) | |
531 | ++p; | |
532 | } | |
a04549c1 | 533 | while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ |
1e2e27fd UD |
534 | /* Parse the line. If it is invalid, loop to |
535 | get the next line of the file to parse. */ | |
a04549c1 JM |
536 | || !(parse_res = _nss_files_parse_grent (p, result, data, buflen, |
537 | errnop))); | |
cc3fa755 | 538 | |
a1ffb40e | 539 | if (__glibc_unlikely (parse_res == -1)) |
20f8e666 UD |
540 | /* The parser ran out of space. */ |
541 | goto erange_reset; | |
cc3fa755 UD |
542 | |
543 | /* This is a real entry. */ | |
544 | if (result->gr_name[0] != '+' && result->gr_name[0] != '-') | |
545 | { | |
546 | if (result->gr_gid == gid) | |
547 | return NSS_STATUS_SUCCESS; | |
548 | else | |
549 | continue; | |
550 | } | |
551 | ||
552 | /* -group */ | |
d71b808a | 553 | if (result->gr_name[0] == '-' && result->gr_name[1] != '\0') |
cc3fa755 | 554 | { |
1e2e27fd UD |
555 | blacklist_store_name (&result->gr_name[1], ent); |
556 | continue; | |
cc3fa755 UD |
557 | } |
558 | ||
559 | /* +group */ | |
d71b808a | 560 | if (result->gr_name[0] == '+' && result->gr_name[1] != '\0') |
cc3fa755 | 561 | { |
33c6de58 UD |
562 | /* Yes, no +1, see the memcpy call below. */ |
563 | size_t len = strlen (result->gr_name); | |
564 | char buf[len]; | |
cc3fa755 UD |
565 | enum nss_status status; |
566 | ||
567 | /* Store the group in the blacklist for the "+" at the end of | |
1e2e27fd | 568 | /etc/group */ |
33c6de58 | 569 | memcpy (buf, &result->gr_name[1], len); |
1e2e27fd UD |
570 | status = getgrnam_plusgroup (&result->gr_name[1], result, ent, |
571 | buffer, buflen, errnop); | |
33c6de58 | 572 | blacklist_store_name (buf, ent); |
cc3fa755 UD |
573 | if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid) |
574 | break; | |
575 | else | |
576 | continue; | |
577 | } | |
578 | /* +:... */ | |
579 | if (result->gr_name[0] == '+' && result->gr_name[1] == '\0') | |
580 | { | |
016c70ea UD |
581 | if (!nss_getgrgid_r) |
582 | return NSS_STATUS_UNAVAIL; | |
cc3fa755 | 583 | |
016c70ea UD |
584 | enum nss_status status = nss_getgrgid_r (gid, result, buffer, buflen, |
585 | errnop); | |
cc3fa755 | 586 | if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */ |
34816665 | 587 | return NSS_STATUS_NOTFOUND; |
cc3fa755 UD |
588 | else |
589 | return status; | |
590 | } | |
591 | } | |
592 | ||
593 | return NSS_STATUS_SUCCESS; | |
594 | } | |
6259ec0d UD |
595 | |
596 | enum nss_status | |
597 | _nss_compat_getgrgid_r (gid_t gid, struct group *grp, | |
d71b808a | 598 | char *buffer, size_t buflen, int *errnop) |
6259ec0d | 599 | { |
64d1e08e | 600 | ent_t ent = { true, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }}; |
1e2e27fd | 601 | enum nss_status result; |
6259ec0d | 602 | |
26dee9c4 | 603 | __libc_lock_lock (lock); |
c131718c | 604 | |
1e2e27fd UD |
605 | if (ni == NULL) |
606 | init_nss_interface (); | |
c131718c | 607 | |
26dee9c4 UD |
608 | __libc_lock_unlock (lock); |
609 | ||
cb62745a | 610 | result = internal_setgrent (&ent, 0, 0); |
6259ec0d | 611 | |
1e2e27fd UD |
612 | if (result == NSS_STATUS_SUCCESS) |
613 | result = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop); | |
6259ec0d UD |
614 | |
615 | internal_endgrent (&ent); | |
cc3fa755 | 616 | |
1e2e27fd | 617 | return result; |
6259ec0d UD |
618 | } |
619 | ||
620 | ||
621 | /* Support routines for remembering -@netgroup and -user entries. | |
622 | The names are stored in a single string with `|' as separator. */ | |
623 | static void | |
624 | blacklist_store_name (const char *name, ent_t *ent) | |
625 | { | |
626 | int namelen = strlen (name); | |
627 | char *tmp; | |
628 | ||
629 | /* first call, setup cache */ | |
630 | if (ent->blacklist.size == 0) | |
631 | { | |
632 | ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen); | |
633 | ent->blacklist.data = malloc (ent->blacklist.size); | |
634 | if (ent->blacklist.data == NULL) | |
635 | return; | |
636 | ent->blacklist.data[0] = '|'; | |
637 | ent->blacklist.data[1] = '\0'; | |
638 | ent->blacklist.current = 1; | |
639 | } | |
640 | else | |
641 | { | |
642 | if (in_blacklist (name, namelen, ent)) | |
643 | return; /* no duplicates */ | |
644 | ||
645 | if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size) | |
646 | { | |
647 | ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen); | |
648 | tmp = realloc (ent->blacklist.data, ent->blacklist.size); | |
649 | if (tmp == NULL) | |
650 | { | |
651 | free (ent->blacklist.data); | |
652 | ent->blacklist.size = 0; | |
653 | return; | |
654 | } | |
655 | ent->blacklist.data = tmp; | |
656 | } | |
657 | } | |
658 | ||
659 | tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name); | |
660 | *tmp++ = '|'; | |
661 | *tmp = '\0'; | |
662 | ent->blacklist.current += namelen + 1; | |
663 | ||
664 | return; | |
665 | } | |
666 | ||
64d1e08e AS |
667 | /* Return whether ent->blacklist contains name. */ |
668 | static bool | |
6259ec0d UD |
669 | in_blacklist (const char *name, int namelen, ent_t *ent) |
670 | { | |
671 | char buf[namelen + 3]; | |
c131718c | 672 | char *cp; |
6259ec0d UD |
673 | |
674 | if (ent->blacklist.data == NULL) | |
64d1e08e | 675 | return false; |
6259ec0d | 676 | |
c131718c UD |
677 | buf[0] = '|'; |
678 | cp = stpcpy (&buf[1], name); | |
1e2e27fd | 679 | *cp++ = '|'; |
c131718c | 680 | *cp = '\0'; |
6259ec0d UD |
681 | return strstr (ent->blacklist.data, buf) != NULL; |
682 | } |