1 | /* Copyright (C) 1996-2016 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 <ctype.h> |
20 | #include <dlfcn.h> |
21 | #include <errno.h> |
22 | #include <netdb.h> |
23 | #include <libc-lock.h> |
24 | #include <search.h> |
25 | #include <stdio.h> |
26 | #include <stdio_ext.h> |
27 | #include <stdlib.h> |
28 | #include <string.h> |
29 | |
30 | #include <aliases.h> |
31 | #include <grp.h> |
32 | #include <netinet/ether.h> |
33 | #include <pwd.h> |
34 | #include <shadow.h> |
35 | |
36 | #if !defined DO_STATIC_NSS || defined SHARED |
37 | # include <gnu/lib-names.h> |
38 | #endif |
39 | |
40 | #include "nsswitch.h" |
41 | #include "../nscd/nscd_proto.h" |
42 | #include <sysdep.h> |
43 | |
44 | /* Prototypes for the local functions. */ |
45 | static name_database *nss_parse_file (const char *fname) internal_function; |
46 | static name_database_entry *nss_getline (char *line) internal_function; |
47 | static service_user *nss_parse_service_list (const char *line) |
48 | internal_function; |
49 | #if !defined DO_STATIC_NSS || defined SHARED |
50 | static service_library *nss_new_service (name_database *database, |
51 | const char *name) internal_function; |
52 | #endif |
53 | |
54 | |
55 | /* Declare external database variables. */ |
56 | #define DEFINE_DATABASE(name) \ |
57 | extern service_user *__nss_##name##_database attribute_hidden; \ |
58 | weak_extern (__nss_##name##_database) |
59 | #include "databases.def" |
60 | #undef DEFINE_DATABASE |
61 | |
62 | /* Structure to map database name to variable. */ |
63 | static const struct |
64 | { |
65 | const char name[10]; |
66 | service_user **dbp; |
67 | } databases[] = |
68 | { |
69 | #define DEFINE_DATABASE(name) \ |
70 | { #name, &__nss_##name##_database }, |
71 | #include "databases.def" |
72 | #undef DEFINE_DATABASE |
73 | }; |
74 | #define ndatabases (sizeof (databases) / sizeof (databases[0])) |
75 | |
76 | /* Flags whether custom rules for database is set. */ |
77 | bool __nss_database_custom[NSS_DBSIDX_max]; |
78 | |
79 | |
80 | __libc_lock_define_initialized (static, lock) |
81 | |
82 | #if !defined DO_STATIC_NSS || defined SHARED |
83 | /* String with revision number of the shared object files. */ |
84 | static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15; |
85 | #endif |
86 | |
87 | /* The root of the whole data base. */ |
88 | static name_database *service_table; |
89 | |
90 | /* List of default service lists that were generated by glibc because |
91 | /etc/nsswitch.conf did not provide a value. |
92 | The list is only maintained so we can free such service lists in |
93 | __libc_freeres. */ |
94 | static name_database_entry *defconfig_entries; |
95 | |
96 | |
97 | #ifdef USE_NSCD |
98 | /* Nonzero if this is the nscd process. */ |
99 | static bool is_nscd; |
100 | /* The callback passed to the init functions when nscd is used. */ |
101 | static void (*nscd_init_cb) (size_t, struct traced_file *); |
102 | #endif |
103 | |
104 | |
105 | /* -1 == database not found |
106 | 0 == database entry pointer stored */ |
107 | int |
108 | __nss_database_lookup (const char *database, const char *alternate_name, |
109 | const char *defconfig, service_user **ni) |
110 | { |
111 | /* Prevent multiple threads to change the service table. */ |
112 | __libc_lock_lock (lock); |
113 | |
114 | /* Reconsider database variable in case some other thread called |
115 | `__nss_configure_lookup' while we waited for the lock. */ |
116 | if (*ni != NULL) |
117 | { |
118 | __libc_lock_unlock (lock); |
119 | return 0; |
120 | } |
121 | |
122 | /* Are we initialized yet? */ |
123 | if (service_table == NULL) |
124 | /* Read config file. */ |
125 | service_table = nss_parse_file (_PATH_NSSWITCH_CONF); |
126 | |
127 | /* Test whether configuration data is available. */ |
128 | if (service_table != NULL) |
129 | { |
130 | /* Return first `service_user' entry for DATABASE. */ |
131 | name_database_entry *entry; |
132 | |
133 | /* XXX Could use some faster mechanism here. But each database is |
134 | only requested once and so this might not be critical. */ |
135 | for (entry = service_table->entry; entry != NULL; entry = entry->next) |
136 | if (strcmp (database, entry->name) == 0) |
137 | *ni = entry->service; |
138 | |
139 | if (*ni == NULL && alternate_name != NULL) |
140 | /* We haven't found an entry so far. Try to find it with the |
141 | alternative name. */ |
142 | for (entry = service_table->entry; entry != NULL; entry = entry->next) |
143 | if (strcmp (alternate_name, entry->name) == 0) |
144 | *ni = entry->service; |
145 | } |
146 | |
147 | /* No configuration data is available, either because nsswitch.conf |
148 | doesn't exist or because it doesn't have a line for this database. |
149 | |
150 | DEFCONFIG specifies the default service list for this database, |
151 | or null to use the most common default. */ |
152 | if (*ni == NULL) |
153 | { |
154 | *ni = nss_parse_service_list (defconfig |
155 | ?: "nis [NOTFOUND=return] files" ); |
156 | if (*ni != NULL) |
157 | { |
158 | /* Record the memory we've just allocated in defconfig_entries list, |
159 | so we can free it later. */ |
160 | name_database_entry *entry; |
161 | |
162 | /* Allocate ENTRY plus size of name (1 here). */ |
163 | entry = (name_database_entry *) malloc (sizeof (*entry) + 1); |
164 | |
165 | if (entry != NULL) |
166 | { |
167 | entry->next = defconfig_entries; |
168 | entry->service = *ni; |
169 | entry->name[0] = '\0'; |
170 | defconfig_entries = entry; |
171 | } |
172 | } |
173 | } |
174 | |
175 | __libc_lock_unlock (lock); |
176 | |
177 | return *ni != NULL ? 0 : -1; |
178 | } |
179 | libc_hidden_def (__nss_database_lookup) |
180 | |
181 | |
182 | /* -1 == not found |
183 | 0 == function found |
184 | 1 == finished */ |
185 | int |
186 | __nss_lookup (service_user **ni, const char *fct_name, const char *fct2_name, |
187 | void **fctp) |
188 | { |
189 | *fctp = __nss_lookup_function (*ni, fct_name); |
190 | if (*fctp == NULL && fct2_name != NULL) |
191 | *fctp = __nss_lookup_function (*ni, fct2_name); |
192 | |
193 | while (*fctp == NULL |
194 | && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE |
195 | && (*ni)->next != NULL) |
196 | { |
197 | *ni = (*ni)->next; |
198 | |
199 | *fctp = __nss_lookup_function (*ni, fct_name); |
200 | if (*fctp == NULL && fct2_name != NULL) |
201 | *fctp = __nss_lookup_function (*ni, fct2_name); |
202 | } |
203 | |
204 | return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1; |
205 | } |
206 | libc_hidden_def (__nss_lookup) |
207 | |
208 | |
209 | /* -1 == not found |
210 | 0 == adjusted for next function |
211 | 1 == finished */ |
212 | int |
213 | __nss_next2 (service_user **ni, const char *fct_name, const char *fct2_name, |
214 | void **fctp, int status, int all_values) |
215 | { |
216 | if (all_values) |
217 | { |
218 | if (nss_next_action (*ni, NSS_STATUS_TRYAGAIN) == NSS_ACTION_RETURN |
219 | && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_RETURN |
220 | && nss_next_action (*ni, NSS_STATUS_NOTFOUND) == NSS_ACTION_RETURN |
221 | && nss_next_action (*ni, NSS_STATUS_SUCCESS) == NSS_ACTION_RETURN) |
222 | return 1; |
223 | } |
224 | else |
225 | { |
226 | /* This is really only for debugging. */ |
227 | if (__builtin_expect (NSS_STATUS_TRYAGAIN > status |
228 | || status > NSS_STATUS_RETURN, 0)) |
229 | __libc_fatal ("illegal status in __nss_next" ); |
230 | |
231 | if (nss_next_action (*ni, status) == NSS_ACTION_RETURN) |
232 | return 1; |
233 | } |
234 | |
235 | if ((*ni)->next == NULL) |
236 | return -1; |
237 | |
238 | do |
239 | { |
240 | *ni = (*ni)->next; |
241 | |
242 | *fctp = __nss_lookup_function (*ni, fct_name); |
243 | if (*fctp == NULL && fct2_name != NULL) |
244 | *fctp = __nss_lookup_function (*ni, fct2_name); |
245 | } |
246 | while (*fctp == NULL |
247 | && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE |
248 | && (*ni)->next != NULL); |
249 | |
250 | return *fctp != NULL ? 0 : -1; |
251 | } |
252 | libc_hidden_def (__nss_next2) |
253 | |
254 | |
255 | int |
256 | attribute_compat_text_section |
257 | __nss_next (service_user **ni, const char *fct_name, void **fctp, int status, |
258 | int all_values) |
259 | { |
260 | return __nss_next2 (ni, fct_name, NULL, fctp, status, all_values); |
261 | } |
262 | |
263 | |
264 | int |
265 | __nss_configure_lookup (const char *dbname, const char *service_line) |
266 | { |
267 | service_user *new_db; |
268 | size_t cnt; |
269 | |
270 | for (cnt = 0; cnt < ndatabases; ++cnt) |
271 | { |
272 | int cmp = strcmp (dbname, databases[cnt].name); |
273 | if (cmp == 0) |
274 | break; |
275 | if (cmp < 0) |
276 | { |
277 | __set_errno (EINVAL); |
278 | return -1; |
279 | } |
280 | } |
281 | |
282 | if (cnt == ndatabases) |
283 | { |
284 | __set_errno (EINVAL); |
285 | return -1; |
286 | } |
287 | |
288 | /* Test whether it is really used. */ |
289 | if (databases[cnt].dbp == NULL) |
290 | /* Nothing to do, but we could do. */ |
291 | return 0; |
292 | |
293 | /* Try to generate new data. */ |
294 | new_db = nss_parse_service_list (service_line); |
295 | if (new_db == NULL) |
296 | { |
297 | /* Illegal service specification. */ |
298 | __set_errno (EINVAL); |
299 | return -1; |
300 | } |
301 | |
302 | /* Prevent multiple threads to change the service table. */ |
303 | __libc_lock_lock (lock); |
304 | |
305 | /* Install new rules. */ |
306 | *databases[cnt].dbp = new_db; |
307 | __nss_database_custom[cnt] = true; |
308 | |
309 | __libc_lock_unlock (lock); |
310 | |
311 | return 0; |
312 | } |
313 | |
314 | |
315 | /* Comparison function for searching NI->known tree. */ |
316 | static int |
317 | known_compare (const void *p1, const void *p2) |
318 | { |
319 | return p1 == p2 ? 0 : strcmp (*(const char *const *) p1, |
320 | *(const char *const *) p2); |
321 | } |
322 | |
323 | |
324 | #if !defined DO_STATIC_NSS || defined SHARED |
325 | /* Load library. */ |
326 | static int |
327 | nss_load_library (service_user *ni) |
328 | { |
329 | if (ni->library == NULL) |
330 | { |
331 | /* This service has not yet been used. Fetch the service |
332 | library for it, creating a new one if need be. If there |
333 | is no service table from the file, this static variable |
334 | holds the head of the service_library list made from the |
335 | default configuration. */ |
336 | static name_database default_table; |
337 | ni->library = nss_new_service (service_table ?: &default_table, |
338 | ni->name); |
339 | if (ni->library == NULL) |
340 | return -1; |
341 | } |
342 | |
343 | if (ni->library->lib_handle == NULL) |
344 | { |
345 | /* Load the shared library. */ |
346 | size_t shlen = (7 + strlen (ni->name) + 3 |
347 | + strlen (__nss_shlib_revision) + 1); |
348 | int saved_errno = errno; |
349 | char shlib_name[shlen]; |
350 | |
351 | /* Construct shared object name. */ |
352 | __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name, |
353 | "libnss_" ), |
354 | ni->name), |
355 | ".so" ), |
356 | __nss_shlib_revision); |
357 | |
358 | ni->library->lib_handle = __libc_dlopen (shlib_name); |
359 | if (ni->library->lib_handle == NULL) |
360 | { |
361 | /* Failed to load the library. */ |
362 | ni->library->lib_handle = (void *) -1l; |
363 | __set_errno (saved_errno); |
364 | } |
365 | # ifdef USE_NSCD |
366 | else if (is_nscd) |
367 | { |
368 | /* Call the init function when nscd is used. */ |
369 | size_t initlen = (5 + strlen (ni->name) |
370 | + strlen ("_init" ) + 1); |
371 | char init_name[initlen]; |
372 | |
373 | /* Construct the init function name. */ |
374 | __stpcpy (__stpcpy (__stpcpy (init_name, |
375 | "_nss_" ), |
376 | ni->name), |
377 | "_init" ); |
378 | |
379 | /* Find the optional init function. */ |
380 | void (*ifct) (void (*) (size_t, struct traced_file *)) |
381 | = __libc_dlsym (ni->library->lib_handle, init_name); |
382 | if (ifct != NULL) |
383 | { |
384 | void (*cb) (size_t, struct traced_file *) = nscd_init_cb; |
385 | # ifdef PTR_DEMANGLE |
386 | PTR_DEMANGLE (cb); |
387 | # endif |
388 | ifct (cb); |
389 | } |
390 | } |
391 | # endif |
392 | } |
393 | |
394 | return 0; |
395 | } |
396 | #endif |
397 | |
398 | |
399 | void * |
400 | __nss_lookup_function (service_user *ni, const char *fct_name) |
401 | { |
402 | void **found, *result; |
403 | |
404 | /* We now modify global data. Protect it. */ |
405 | __libc_lock_lock (lock); |
406 | |
407 | /* Search the tree of functions previously requested. Data in the |
408 | tree are `known_function' structures, whose first member is a |
409 | `const char *', the lookup key. The search returns a pointer to |
410 | the tree node structure; the first member of the is a pointer to |
411 | our structure (i.e. what will be a `known_function'); since the |
412 | first member of that is the lookup key string, &FCT_NAME is close |
413 | enough to a pointer to our structure to use as a lookup key that |
414 | will be passed to `known_compare' (above). */ |
415 | |
416 | found = __tsearch (&fct_name, &ni->known, &known_compare); |
417 | if (found == NULL) |
418 | /* This means out-of-memory. */ |
419 | result = NULL; |
420 | else if (*found != &fct_name) |
421 | { |
422 | /* The search found an existing structure in the tree. */ |
423 | result = ((known_function *) *found)->fct_ptr; |
424 | #ifdef PTR_DEMANGLE |
425 | PTR_DEMANGLE (result); |
426 | #endif |
427 | } |
428 | else |
429 | { |
430 | /* This name was not known before. Now we have a node in the tree |
431 | (in the proper sorted position for FCT_NAME) that points to |
432 | &FCT_NAME instead of any real `known_function' structure. |
433 | Allocate a new structure and fill it in. */ |
434 | |
435 | known_function *known = malloc (sizeof *known); |
436 | if (! known) |
437 | { |
438 | #if !defined DO_STATIC_NSS || defined SHARED |
439 | remove_from_tree: |
440 | #endif |
441 | /* Oops. We can't instantiate this node properly. |
442 | Remove it from the tree. */ |
443 | __tdelete (&fct_name, &ni->known, &known_compare); |
444 | free (known); |
445 | result = NULL; |
446 | } |
447 | else |
448 | { |
449 | /* Point the tree node at this new structure. */ |
450 | *found = known; |
451 | known->fct_name = fct_name; |
452 | |
453 | #if !defined DO_STATIC_NSS || defined SHARED |
454 | /* Load the appropriate library. */ |
455 | if (nss_load_library (ni) != 0) |
456 | /* This only happens when out of memory. */ |
457 | goto remove_from_tree; |
458 | |
459 | if (ni->library->lib_handle == (void *) -1l) |
460 | /* Library not found => function not found. */ |
461 | result = NULL; |
462 | else |
463 | { |
464 | /* Get the desired function. */ |
465 | size_t namlen = (5 + strlen (ni->name) + 1 |
466 | + strlen (fct_name) + 1); |
467 | char name[namlen]; |
468 | |
469 | /* Construct the function name. */ |
470 | __stpcpy (__stpcpy (__stpcpy (__stpcpy (name, "_nss_" ), |
471 | ni->name), |
472 | "_" ), |
473 | fct_name); |
474 | |
475 | /* Look up the symbol. */ |
476 | result = __libc_dlsym (ni->library->lib_handle, name); |
477 | } |
478 | #else |
479 | /* We can't get function address dynamically in static linking. */ |
480 | { |
481 | # define DEFINE_ENT(h,nm) \ |
482 | { #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r }, \ |
483 | { #h"_end"#nm"ent", _nss_##h##_end##nm##ent }, \ |
484 | { #h"_set"#nm"ent", _nss_##h##_set##nm##ent }, |
485 | # define DEFINE_GET(h,nm) \ |
486 | { #h"_get"#nm"_r", _nss_##h##_get##nm##_r }, |
487 | # define DEFINE_GETBY(h,nm,ky) \ |
488 | { #h"_get"#nm"by"#ky"_r", _nss_##h##_get##nm##by##ky##_r }, |
489 | static struct fct_tbl { const char *fname; void *fp; } *tp, tbl[] = |
490 | { |
491 | # include "function.def" |
492 | { NULL, NULL } |
493 | }; |
494 | size_t namlen = (5 + strlen (ni->name) + 1 |
495 | + strlen (fct_name) + 1); |
496 | char name[namlen]; |
497 | |
498 | /* Construct the function name. */ |
499 | __stpcpy (__stpcpy (__stpcpy (name, ni->name), |
500 | "_" ), |
501 | fct_name); |
502 | |
503 | result = NULL; |
504 | for (tp = &tbl[0]; tp->fname; tp++) |
505 | if (strcmp (tp->fname, name) == 0) |
506 | { |
507 | result = tp->fp; |
508 | break; |
509 | } |
510 | } |
511 | #endif |
512 | |
513 | /* Remember function pointer for later calls. Even if null, we |
514 | record it so a second try needn't search the library again. */ |
515 | known->fct_ptr = result; |
516 | #ifdef PTR_MANGLE |
517 | PTR_MANGLE (known->fct_ptr); |
518 | #endif |
519 | } |
520 | } |
521 | |
522 | /* Remove the lock. */ |
523 | __libc_lock_unlock (lock); |
524 | |
525 | return result; |
526 | } |
527 | libc_hidden_def (__nss_lookup_function) |
528 | |
529 | |
530 | static name_database * |
531 | internal_function |
532 | nss_parse_file (const char *fname) |
533 | { |
534 | FILE *fp; |
535 | name_database *result; |
536 | name_database_entry *last; |
537 | char *line; |
538 | size_t len; |
539 | |
540 | /* Open the configuration file. */ |
541 | fp = fopen (fname, "rce" ); |
542 | if (fp == NULL) |
543 | return NULL; |
544 | |
545 | /* No threads use this stream. */ |
546 | __fsetlocking (fp, FSETLOCKING_BYCALLER); |
547 | |
548 | result = (name_database *) malloc (sizeof (name_database)); |
549 | if (result == NULL) |
550 | { |
551 | fclose (fp); |
552 | return NULL; |
553 | } |
554 | |
555 | result->entry = NULL; |
556 | result->library = NULL; |
557 | last = NULL; |
558 | line = NULL; |
559 | len = 0; |
560 | do |
561 | { |
562 | name_database_entry *this; |
563 | ssize_t n; |
564 | |
565 | n = __getline (&line, &len, fp); |
566 | if (n < 0) |
567 | break; |
568 | if (line[n - 1] == '\n') |
569 | line[n - 1] = '\0'; |
570 | |
571 | /* Because the file format does not know any form of quoting we |
572 | can search forward for the next '#' character and if found |
573 | make it terminating the line. */ |
574 | *__strchrnul (line, '#') = '\0'; |
575 | |
576 | /* If the line is blank it is ignored. */ |
577 | if (line[0] == '\0') |
578 | continue; |
579 | |
580 | /* Each line completely specifies the actions for a database. */ |
581 | this = nss_getline (line); |
582 | if (this != NULL) |
583 | { |
584 | if (last != NULL) |
585 | last->next = this; |
586 | else |
587 | result->entry = this; |
588 | |
589 | last = this; |
590 | } |
591 | } |
592 | while (!feof_unlocked (fp)); |
593 | |
594 | /* Free the buffer. */ |
595 | free (line); |
596 | /* Close configuration file. */ |
597 | fclose (fp); |
598 | |
599 | return result; |
600 | } |
601 | |
602 | |
603 | /* Read the source names: |
604 | `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*' |
605 | */ |
606 | static service_user * |
607 | internal_function |
608 | nss_parse_service_list (const char *line) |
609 | { |
610 | service_user *result = NULL, **nextp = &result; |
611 | |
612 | while (1) |
613 | { |
614 | service_user *new_service; |
615 | const char *name; |
616 | |
617 | while (isspace (line[0])) |
618 | ++line; |
619 | if (line[0] == '\0') |
620 | /* No source specified. */ |
621 | return result; |
622 | |
623 | /* Read <source> identifier. */ |
624 | name = line; |
625 | while (line[0] != '\0' && !isspace (line[0]) && line[0] != '[') |
626 | ++line; |
627 | if (name == line) |
628 | return result; |
629 | |
630 | |
631 | new_service = (service_user *) malloc (sizeof (service_user) |
632 | + (line - name + 1)); |
633 | if (new_service == NULL) |
634 | return result; |
635 | |
636 | *((char *) __mempcpy (new_service->name, name, line - name)) = '\0'; |
637 | |
638 | /* Set default actions. */ |
639 | new_service->actions[2 + NSS_STATUS_TRYAGAIN] = NSS_ACTION_CONTINUE; |
640 | new_service->actions[2 + NSS_STATUS_UNAVAIL] = NSS_ACTION_CONTINUE; |
641 | new_service->actions[2 + NSS_STATUS_NOTFOUND] = NSS_ACTION_CONTINUE; |
642 | new_service->actions[2 + NSS_STATUS_SUCCESS] = NSS_ACTION_RETURN; |
643 | new_service->actions[2 + NSS_STATUS_RETURN] = NSS_ACTION_RETURN; |
644 | new_service->library = NULL; |
645 | new_service->known = NULL; |
646 | new_service->next = NULL; |
647 | |
648 | while (isspace (line[0])) |
649 | ++line; |
650 | |
651 | if (line[0] == '[') |
652 | { |
653 | /* Read criterions. */ |
654 | do |
655 | ++line; |
656 | while (line[0] != '\0' && isspace (line[0])); |
657 | |
658 | do |
659 | { |
660 | int not; |
661 | enum nss_status status; |
662 | lookup_actions action; |
663 | |
664 | /* Grok ! before name to mean all statii but that one. */ |
665 | not = line[0] == '!'; |
666 | if (not) |
667 | ++line; |
668 | |
669 | /* Read status name. */ |
670 | name = line; |
671 | while (line[0] != '\0' && !isspace (line[0]) && line[0] != '=' |
672 | && line[0] != ']') |
673 | ++line; |
674 | |
675 | /* Compare with known statii. */ |
676 | if (line - name == 7) |
677 | { |
678 | if (__strncasecmp (name, "SUCCESS" , 7) == 0) |
679 | status = NSS_STATUS_SUCCESS; |
680 | else if (__strncasecmp (name, "UNAVAIL" , 7) == 0) |
681 | status = NSS_STATUS_UNAVAIL; |
682 | else |
683 | goto finish; |
684 | } |
685 | else if (line - name == 8) |
686 | { |
687 | if (__strncasecmp (name, "NOTFOUND" , 8) == 0) |
688 | status = NSS_STATUS_NOTFOUND; |
689 | else if (__strncasecmp (name, "TRYAGAIN" , 8) == 0) |
690 | status = NSS_STATUS_TRYAGAIN; |
691 | else |
692 | goto finish; |
693 | } |
694 | else |
695 | goto finish; |
696 | |
697 | while (isspace (line[0])) |
698 | ++line; |
699 | if (line[0] != '=') |
700 | goto finish; |
701 | do |
702 | ++line; |
703 | while (isspace (line[0])); |
704 | |
705 | name = line; |
706 | while (line[0] != '\0' && !isspace (line[0]) && line[0] != '=' |
707 | && line[0] != ']') |
708 | ++line; |
709 | |
710 | if (line - name == 6 && __strncasecmp (name, "RETURN" , 6) == 0) |
711 | action = NSS_ACTION_RETURN; |
712 | else if (line - name == 8 |
713 | && __strncasecmp (name, "CONTINUE" , 8) == 0) |
714 | action = NSS_ACTION_CONTINUE; |
715 | else |
716 | goto finish; |
717 | |
718 | if (not) |
719 | { |
720 | /* Save the current action setting for this status, |
721 | set them all to the given action, and reset this one. */ |
722 | const lookup_actions save = new_service->actions[2 + status]; |
723 | new_service->actions[2 + NSS_STATUS_TRYAGAIN] = action; |
724 | new_service->actions[2 + NSS_STATUS_UNAVAIL] = action; |
725 | new_service->actions[2 + NSS_STATUS_NOTFOUND] = action; |
726 | new_service->actions[2 + NSS_STATUS_SUCCESS] = action; |
727 | new_service->actions[2 + status] = save; |
728 | } |
729 | else |
730 | new_service->actions[2 + status] = action; |
731 | |
732 | /* Skip white spaces. */ |
733 | while (isspace (line[0])) |
734 | ++line; |
735 | } |
736 | while (line[0] != ']'); |
737 | |
738 | /* Skip the ']'. */ |
739 | ++line; |
740 | } |
741 | |
742 | *nextp = new_service; |
743 | nextp = &new_service->next; |
744 | continue; |
745 | |
746 | finish: |
747 | free (new_service); |
748 | return result; |
749 | } |
750 | } |
751 | |
752 | static name_database_entry * |
753 | internal_function |
754 | nss_getline (char *line) |
755 | { |
756 | const char *name; |
757 | name_database_entry *result; |
758 | size_t len; |
759 | |
760 | /* Ignore leading white spaces. ATTENTION: this is different from |
761 | what is implemented in Solaris. The Solaris man page says a line |
762 | beginning with a white space character is ignored. We regard |
763 | this as just another misfeature in Solaris. */ |
764 | while (isspace (line[0])) |
765 | ++line; |
766 | |
767 | /* Recognize `<database> ":"'. */ |
768 | name = line; |
769 | while (line[0] != '\0' && !isspace (line[0]) && line[0] != ':') |
770 | ++line; |
771 | if (line[0] == '\0' || name == line) |
772 | /* Syntax error. */ |
773 | return NULL; |
774 | *line++ = '\0'; |
775 | |
776 | len = strlen (name) + 1; |
777 | |
778 | result = (name_database_entry *) malloc (sizeof (name_database_entry) + len); |
779 | if (result == NULL) |
780 | return NULL; |
781 | |
782 | /* Save the database name. */ |
783 | memcpy (result->name, name, len); |
784 | |
785 | /* Parse the list of services. */ |
786 | result->service = nss_parse_service_list (line); |
787 | |
788 | result->next = NULL; |
789 | return result; |
790 | } |
791 | |
792 | |
793 | #if !defined DO_STATIC_NSS || defined SHARED |
794 | static service_library * |
795 | internal_function |
796 | nss_new_service (name_database *database, const char *name) |
797 | { |
798 | service_library **currentp = &database->library; |
799 | |
800 | while (*currentp != NULL) |
801 | { |
802 | if (strcmp ((*currentp)->name, name) == 0) |
803 | return *currentp; |
804 | currentp = &(*currentp)->next; |
805 | } |
806 | |
807 | /* We have to add the new service. */ |
808 | *currentp = (service_library *) malloc (sizeof (service_library)); |
809 | if (*currentp == NULL) |
810 | return NULL; |
811 | |
812 | (*currentp)->name = name; |
813 | (*currentp)->lib_handle = NULL; |
814 | (*currentp)->next = NULL; |
815 | |
816 | return *currentp; |
817 | } |
818 | #endif |
819 | |
820 | |
821 | #if defined SHARED && defined USE_NSCD |
822 | /* Load all libraries for the service. */ |
823 | static void |
824 | nss_load_all_libraries (const char *service, const char *def) |
825 | { |
826 | service_user *ni = NULL; |
827 | |
828 | if (__nss_database_lookup (service, NULL, def, &ni) == 0) |
829 | while (ni != NULL) |
830 | { |
831 | nss_load_library (ni); |
832 | ni = ni->next; |
833 | } |
834 | } |
835 | |
836 | |
837 | /* Called by nscd and nscd alone. */ |
838 | void |
839 | __nss_disable_nscd (void (*cb) (size_t, struct traced_file *)) |
840 | { |
841 | # ifdef PTR_MANGLE |
842 | PTR_MANGLE (cb); |
843 | # endif |
844 | nscd_init_cb = cb; |
845 | is_nscd = true; |
846 | |
847 | /* Find all the relevant modules so that the init functions are called. */ |
848 | nss_load_all_libraries ("passwd" , "compat [NOTFOUND=return] files" ); |
849 | nss_load_all_libraries ("group" , "compat [NOTFOUND=return] files" ); |
850 | nss_load_all_libraries ("hosts" , "dns [!UNAVAIL=return] files" ); |
851 | nss_load_all_libraries ("services" , NULL); |
852 | |
853 | /* Disable all uses of NSCD. */ |
854 | __nss_not_use_nscd_passwd = -1; |
855 | __nss_not_use_nscd_group = -1; |
856 | __nss_not_use_nscd_hosts = -1; |
857 | __nss_not_use_nscd_services = -1; |
858 | __nss_not_use_nscd_netgroup = -1; |
859 | } |
860 | #endif |
861 | |
862 | static void |
863 | free_database_entries (name_database_entry *entry) |
864 | { |
865 | while (entry != NULL) |
866 | { |
867 | name_database_entry *olde = entry; |
868 | service_user *service = entry->service; |
869 | |
870 | while (service != NULL) |
871 | { |
872 | service_user *olds = service; |
873 | |
874 | if (service->known != NULL) |
875 | __tdestroy (service->known, free); |
876 | |
877 | service = service->next; |
878 | free (olds); |
879 | } |
880 | |
881 | entry = entry->next; |
882 | free (olde); |
883 | } |
884 | } |
885 | |
886 | /* Free all resources if necessary. */ |
887 | libc_freeres_fn (free_defconfig) |
888 | { |
889 | name_database_entry *entry = defconfig_entries; |
890 | |
891 | if (entry == NULL) |
892 | /* defconfig was not used. */ |
893 | return; |
894 | |
895 | /* Don't disturb ongoing other threads (if there are any). */ |
896 | defconfig_entries = NULL; |
897 | |
898 | free_database_entries (entry); |
899 | } |
900 | |
901 | libc_freeres_fn (free_mem) |
902 | { |
903 | name_database *top = service_table; |
904 | service_library *library; |
905 | |
906 | if (top == NULL) |
907 | /* Maybe we have not read the nsswitch.conf file. */ |
908 | return; |
909 | |
910 | /* Don't disturb ongoing other threads (if there are any). */ |
911 | service_table = NULL; |
912 | |
913 | free_database_entries (top->entry); |
914 | |
915 | library = top->library; |
916 | while (library != NULL) |
917 | { |
918 | service_library *oldl = library; |
919 | |
920 | if (library->lib_handle && library->lib_handle != (void *) -1l) |
921 | __libc_dlclose (library->lib_handle); |
922 | |
923 | library = library->next; |
924 | free (oldl); |
925 | } |
926 | |
927 | free (top); |
928 | } |
929 | |