1 /* Copyright (C) 1996-1999,2001-2007,2009,2010 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include <bits/libc-lock.h>
27 #include <stdio_ext.h>
33 #include <netinet/ether.h>
37 #if !defined DO_STATIC_NSS || defined SHARED
38 # include <gnu/lib-names.h>
42 #include "../nscd/nscd_proto.h"
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
)
49 static service_library
*nss_new_service (name_database
*database
,
50 const char *name
) internal_function
;
53 /* Declare external database variables. */
54 #define DEFINE_DATABASE(name) \
55 extern service_user *__nss_##name##_database attribute_hidden; \
56 weak_extern (__nss_##name##_database)
57 #include "databases.def"
58 #undef DEFINE_DATABASE
60 /* Structure to map database name to variable. */
67 #define DEFINE_DATABASE(name) \
68 { #name, &__nss_##name##_database },
69 #include "databases.def"
70 #undef DEFINE_DATABASE
72 #define ndatabases (sizeof (databases) / sizeof (databases[0]))
74 /* Flags whether custom rules for database is set. */
75 bool __nss_database_custom
[NSS_DBSIDX_max
];
78 __libc_lock_define_initialized (static, lock
)
80 #if !defined DO_STATIC_NSS || defined SHARED
81 /* String with revision number of the shared object files. */
82 static const char *const __nss_shlib_revision
= LIBNSS_FILES_SO
+ 15;
85 /* The root of the whole data base. */
86 static name_database
*service_table
;
89 /* -1 == database not found
90 0 == database entry pointer stored */
92 __nss_database_lookup (const char *database
, const char *alternate_name
,
93 const char *defconfig
, service_user
**ni
)
95 /* Prevent multiple threads to change the service table. */
96 __libc_lock_lock (lock
);
98 /* Reconsider database variable in case some other thread called
99 `__nss_configure_lookup' while we waited for the lock. */
102 __libc_lock_unlock (lock
);
106 /* Are we initialized yet? */
107 if (service_table
== NULL
)
108 /* Read config file. */
109 service_table
= nss_parse_file (_PATH_NSSWITCH_CONF
);
111 /* Test whether configuration data is available. */
112 if (service_table
!= NULL
)
114 /* Return first `service_user' entry for DATABASE. */
115 name_database_entry
*entry
;
117 /* XXX Could use some faster mechanism here. But each database is
118 only requested once and so this might not be critical. */
119 for (entry
= service_table
->entry
; entry
!= NULL
; entry
= entry
->next
)
120 if (strcmp (database
, entry
->name
) == 0)
121 *ni
= entry
->service
;
123 if (*ni
== NULL
&& alternate_name
!= NULL
)
124 /* We haven't found an entry so far. Try to find it with the
126 for (entry
= service_table
->entry
; entry
!= NULL
; entry
= entry
->next
)
127 if (strcmp (alternate_name
, entry
->name
) == 0)
128 *ni
= entry
->service
;
131 /* No configuration data is available, either because nsswitch.conf
132 doesn't exist or because it doesn't has a line for this database.
134 DEFCONFIG specifies the default service list for this database,
135 or null to use the most common default. */
137 *ni
= nss_parse_service_list (defconfig
138 ?: "nis [NOTFOUND=return] files");
140 __libc_lock_unlock (lock
);
144 libc_hidden_def (__nss_database_lookup
)
151 __nss_lookup (service_user
**ni
, const char *fct_name
, const char *fct2_name
,
154 *fctp
= __nss_lookup_function (*ni
, fct_name
);
155 if (*fctp
== NULL
&& fct2_name
!= NULL
)
156 *fctp
= __nss_lookup_function (*ni
, fct2_name
);
159 && nss_next_action (*ni
, NSS_STATUS_UNAVAIL
) == NSS_ACTION_CONTINUE
160 && (*ni
)->next
!= NULL
)
164 *fctp
= __nss_lookup_function (*ni
, fct_name
);
165 if (*fctp
== NULL
&& fct2_name
!= NULL
)
166 *fctp
= __nss_lookup_function (*ni
, fct2_name
);
169 return *fctp
!= NULL
? 0 : (*ni
)->next
== NULL
? 1 : -1;
174 0 == adjusted for next function
177 __nss_next2 (service_user
**ni
, const char *fct_name
, const char *fct2_name
,
178 void **fctp
, int status
, int all_values
)
182 if (nss_next_action (*ni
, NSS_STATUS_TRYAGAIN
) == NSS_ACTION_RETURN
183 && nss_next_action (*ni
, NSS_STATUS_UNAVAIL
) == NSS_ACTION_RETURN
184 && nss_next_action (*ni
, NSS_STATUS_NOTFOUND
) == NSS_ACTION_RETURN
185 && nss_next_action (*ni
, NSS_STATUS_SUCCESS
) == NSS_ACTION_RETURN
)
190 /* This is really only for debugging. */
191 if (__builtin_expect (NSS_STATUS_TRYAGAIN
> status
192 || status
> NSS_STATUS_RETURN
, 0))
193 __libc_fatal ("illegal status in __nss_next");
195 if (nss_next_action (*ni
, status
) == NSS_ACTION_RETURN
)
199 if ((*ni
)->next
== NULL
)
206 *fctp
= __nss_lookup_function (*ni
, fct_name
);
207 if (*fctp
== NULL
&& fct2_name
!= NULL
)
208 *fctp
= __nss_lookup_function (*ni
, fct2_name
);
211 && nss_next_action (*ni
, NSS_STATUS_UNAVAIL
) == NSS_ACTION_CONTINUE
212 && (*ni
)->next
!= NULL
);
214 return *fctp
!= NULL
? 0 : -1;
216 libc_hidden_def (__nss_next2
)
220 attribute_compat_text_section
221 __nss_next (service_user
**ni
, const char *fct_name
, void **fctp
, int status
,
224 return __nss_next2 (ni
, fct_name
, NULL
, fctp
, status
, all_values
);
229 __nss_configure_lookup (const char *dbname
, const char *service_line
)
231 service_user
*new_db
;
234 for (cnt
= 0; cnt
< ndatabases
; ++cnt
)
236 int cmp
= strcmp (dbname
, databases
[cnt
].name
);
241 __set_errno (EINVAL
);
246 if (cnt
== ndatabases
)
248 __set_errno (EINVAL
);
252 /* Test whether it is really used. */
253 if (databases
[cnt
].dbp
== NULL
)
254 /* Nothing to do, but we could do. */
257 /* Try to generate new data. */
258 new_db
= nss_parse_service_list (service_line
);
261 /* Illegal service specification. */
262 __set_errno (EINVAL
);
266 /* Prevent multiple threads to change the service table. */
267 __libc_lock_lock (lock
);
269 /* Install new rules. */
270 *databases
[cnt
].dbp
= new_db
;
271 __nss_database_custom
[cnt
] = true;
273 __libc_lock_unlock (lock
);
279 /* Comparison function for searching NI->known tree. */
281 known_compare (const void *p1
, const void *p2
)
283 return p1
== p2
? 0 : strcmp (*(const char *const *) p1
,
284 *(const char *const *) p2
);
289 __nss_lookup_function (service_user
*ni
, const char *fct_name
)
291 void **found
, *result
;
293 /* We now modify global data. Protect it. */
294 __libc_lock_lock (lock
);
296 /* Search the tree of functions previously requested. Data in the
297 tree are `known_function' structures, whose first member is a
298 `const char *', the lookup key. The search returns a pointer to
299 the tree node structure; the first member of the is a pointer to
300 our structure (i.e. what will be a `known_function'); since the
301 first member of that is the lookup key string, &FCT_NAME is close
302 enough to a pointer to our structure to use as a lookup key that
303 will be passed to `known_compare' (above). */
305 found
= __tsearch (&fct_name
, &ni
->known
, &known_compare
);
306 if (*found
!= &fct_name
)
308 /* The search found an existing structure in the tree. */
309 result
= ((known_function
*) *found
)->fct_ptr
;
310 PTR_DEMANGLE (result
);
314 /* This name was not known before. Now we have a node in the tree
315 (in the proper sorted position for FCT_NAME) that points to
316 &FCT_NAME instead of any real `known_function' structure.
317 Allocate a new structure and fill it in. */
319 known_function
*known
= malloc (sizeof *known
);
323 /* Oops. We can't instantiate this node properly.
324 Remove it from the tree. */
325 __tdelete (&fct_name
, &ni
->known
, &known_compare
);
330 /* Point the tree node at this new structure. */
332 known
->fct_name
= fct_name
;
334 if (ni
->library
== NULL
)
336 /* This service has not yet been used. Fetch the service
337 library for it, creating a new one if need be. If there
338 is no service table from the file, this static variable
339 holds the head of the service_library list made from the
340 default configuration. */
341 static name_database default_table
;
342 ni
->library
= nss_new_service (service_table
?: &default_table
,
344 if (ni
->library
== NULL
)
346 /* This only happens when out of memory. */
348 goto remove_from_tree
;
352 #if !defined DO_STATIC_NSS || defined SHARED
353 if (ni
->library
->lib_handle
== NULL
)
355 /* Load the shared library. */
356 size_t shlen
= (7 + strlen (ni
->library
->name
) + 3
357 + strlen (__nss_shlib_revision
) + 1);
358 int saved_errno
= errno
;
359 char shlib_name
[shlen
];
361 /* Construct shared object name. */
362 __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name
,
366 __nss_shlib_revision
);
368 ni
->library
->lib_handle
= __libc_dlopen (shlib_name
);
369 if (ni
->library
->lib_handle
== NULL
)
371 /* Failed to load the library. */
372 ni
->library
->lib_handle
= (void *) -1l;
373 __set_errno (saved_errno
);
377 if (ni
->library
->lib_handle
== (void *) -1l)
378 /* Library not found => function not found. */
382 /* Get the desired function. */
383 size_t namlen
= (5 + strlen (ni
->library
->name
) + 1
384 + strlen (fct_name
) + 1);
387 /* Construct the function name. */
388 __stpcpy (__stpcpy (__stpcpy (__stpcpy (name
, "_nss_"),
393 /* Look up the symbol. */
394 result
= __libc_dlsym (ni
->library
->lib_handle
, name
);
397 /* We can't get function address dynamically in static linking. */
399 # define DEFINE_ENT(h,nm) \
400 { #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r }, \
401 { #h"_end"#nm"ent", _nss_##h##_end##nm##ent }, \
402 { #h"_set"#nm"ent", _nss_##h##_set##nm##ent },
403 # define DEFINE_GET(h,nm) \
404 { #h"_get"#nm"_r", _nss_##h##_get##nm##_r },
405 # define DEFINE_GETBY(h,nm,ky) \
406 { #h"_get"#nm"by"#ky"_r", _nss_##h##_get##nm##by##ky##_r },
407 static struct fct_tbl
{ const char *fname
; void *fp
; } *tp
, tbl
[] =
409 # include "function.def"
412 size_t namlen
= (5 + strlen (ni
->library
->name
) + 1
413 + strlen (fct_name
) + 1);
416 /* Construct the function name. */
417 __stpcpy (__stpcpy (__stpcpy (name
, ni
->library
->name
),
422 for (tp
= &tbl
[0]; tp
->fname
; tp
++)
423 if (strcmp (tp
->fname
, name
) == 0)
431 /* Remember function pointer for later calls. Even if null, we
432 record it so a second try needn't search the library again. */
433 known
->fct_ptr
= result
;
434 PTR_MANGLE (known
->fct_ptr
);
438 /* Remove the lock. */
439 __libc_lock_unlock (lock
);
443 libc_hidden_def (__nss_lookup_function
)
446 static name_database
*
448 nss_parse_file (const char *fname
)
451 name_database
*result
;
452 name_database_entry
*last
;
456 /* Open the configuration file. */
457 fp
= fopen (fname
, "rc");
461 /* No threads use this stream. */
462 __fsetlocking (fp
, FSETLOCKING_BYCALLER
);
464 result
= (name_database
*) malloc (sizeof (name_database
));
468 result
->entry
= NULL
;
469 result
->library
= NULL
;
475 name_database_entry
*this;
478 n
= __getline (&line
, &len
, fp
);
481 if (line
[n
- 1] == '\n')
484 /* Because the file format does not know any form of quoting we
485 can search forward for the next '#' character and if found
486 make it terminating the line. */
487 *__strchrnul (line
, '#') = '\0';
489 /* If the line is blank it is ignored. */
493 /* Each line completely specifies the actions for a database. */
494 this = nss_getline (line
);
500 result
->entry
= this;
505 while (!feof_unlocked (fp
));
507 /* Free the buffer. */
509 /* Close configuration file. */
516 /* Read the source names:
517 `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
519 static service_user
*
521 nss_parse_service_list (const char *line
)
523 service_user
*result
= NULL
, **nextp
= &result
;
527 service_user
*new_service
;
530 while (isspace (line
[0]))
533 /* No source specified. */
536 /* Read <source> identifier. */
538 while (line
[0] != '\0' && !isspace (line
[0]) && line
[0] != '[')
544 new_service
= (service_user
*) malloc (sizeof (service_user
)
545 + (line
- name
+ 1));
546 if (new_service
== NULL
)
549 *((char *) __mempcpy (new_service
->name
, name
, line
- name
)) = '\0';
551 /* Set default actions. */
552 new_service
->actions
[2 + NSS_STATUS_TRYAGAIN
] = NSS_ACTION_CONTINUE
;
553 new_service
->actions
[2 + NSS_STATUS_UNAVAIL
] = NSS_ACTION_CONTINUE
;
554 new_service
->actions
[2 + NSS_STATUS_NOTFOUND
] = NSS_ACTION_CONTINUE
;
555 new_service
->actions
[2 + NSS_STATUS_SUCCESS
] = NSS_ACTION_RETURN
;
556 new_service
->actions
[2 + NSS_STATUS_RETURN
] = NSS_ACTION_RETURN
;
557 new_service
->library
= NULL
;
558 new_service
->known
= NULL
;
559 new_service
->next
= NULL
;
561 while (isspace (line
[0]))
566 /* Read criterions. */
569 while (line
[0] != '\0' && isspace (line
[0]));
574 enum nss_status status
;
575 lookup_actions action
;
577 /* Grok ! before name to mean all statii but that one. */
578 not = line
[0] == '!';
582 /* Read status name. */
584 while (line
[0] != '\0' && !isspace (line
[0]) && line
[0] != '='
588 /* Compare with known statii. */
589 if (line
- name
== 7)
591 if (__strncasecmp (name
, "SUCCESS", 7) == 0)
592 status
= NSS_STATUS_SUCCESS
;
593 else if (__strncasecmp (name
, "UNAVAIL", 7) == 0)
594 status
= NSS_STATUS_UNAVAIL
;
598 else if (line
- name
== 8)
600 if (__strncasecmp (name
, "NOTFOUND", 8) == 0)
601 status
= NSS_STATUS_NOTFOUND
;
602 else if (__strncasecmp (name
, "TRYAGAIN", 8) == 0)
603 status
= NSS_STATUS_TRYAGAIN
;
610 while (isspace (line
[0]))
616 while (isspace (line
[0]));
619 while (line
[0] != '\0' && !isspace (line
[0]) && line
[0] != '='
623 if (line
- name
== 6 && __strncasecmp (name
, "RETURN", 6) == 0)
624 action
= NSS_ACTION_RETURN
;
625 else if (line
- name
== 8
626 && __strncasecmp (name
, "CONTINUE", 8) == 0)
627 action
= NSS_ACTION_CONTINUE
;
633 /* Save the current action setting for this status,
634 set them all to the given action, and reset this one. */
635 const lookup_actions save
= new_service
->actions
[2 + status
];
636 new_service
->actions
[2 + NSS_STATUS_TRYAGAIN
] = action
;
637 new_service
->actions
[2 + NSS_STATUS_UNAVAIL
] = action
;
638 new_service
->actions
[2 + NSS_STATUS_NOTFOUND
] = action
;
639 new_service
->actions
[2 + NSS_STATUS_SUCCESS
] = action
;
640 new_service
->actions
[2 + status
] = save
;
643 new_service
->actions
[2 + status
] = action
;
645 /* Skip white spaces. */
646 while (isspace (line
[0]))
649 while (line
[0] != ']');
655 *nextp
= new_service
;
656 nextp
= &new_service
->next
;
660 static name_database_entry
*
662 nss_getline (char *line
)
665 name_database_entry
*result
;
668 /* Ignore leading white spaces. ATTENTION: this is different from
669 what is implemented in Solaris. The Solaris man page says a line
670 beginning with a white space character is ignored. We regard
671 this as just another misfeature in Solaris. */
672 while (isspace (line
[0]))
675 /* Recognize `<database> ":"'. */
677 while (line
[0] != '\0' && !isspace (line
[0]) && line
[0] != ':')
679 if (line
[0] == '\0' || name
== line
)
684 len
= strlen (name
) + 1;
686 result
= (name_database_entry
*) malloc (sizeof (name_database_entry
) + len
);
690 /* Save the database name. */
691 memcpy (result
->name
, name
, len
);
693 /* Parse the list of services. */
694 result
->service
= nss_parse_service_list (line
);
701 static service_library
*
703 nss_new_service (name_database
*database
, const char *name
)
705 service_library
**currentp
= &database
->library
;
707 while (*currentp
!= NULL
)
709 if (strcmp ((*currentp
)->name
, name
) == 0)
711 currentp
= &(*currentp
)->next
;
714 /* We have to add the new service. */
715 *currentp
= (service_library
*) malloc (sizeof (service_library
));
716 if (*currentp
== NULL
)
719 (*currentp
)->name
= name
;
720 (*currentp
)->lib_handle
= NULL
;
721 (*currentp
)->next
= NULL
;
727 /* Called by nscd and nscd alone. */
729 __nss_disable_nscd (void)
731 /* Disable all uses of NSCD. */
732 __nss_not_use_nscd_passwd
= -1;
733 __nss_not_use_nscd_group
= -1;
734 __nss_not_use_nscd_hosts
= -1;
735 __nss_not_use_nscd_services
= -1;
739 /* Free all resources if necessary. */
740 libc_freeres_fn (free_mem
)
742 name_database
*top
= service_table
;
743 name_database_entry
*entry
;
744 service_library
*library
;
747 /* Maybe we have not read the nsswitch.conf file. */
750 /* Don't disturb ongoing other threads (if there are any). */
751 service_table
= NULL
;
754 while (entry
!= NULL
)
756 name_database_entry
*olde
= entry
;
757 service_user
*service
= entry
->service
;
759 while (service
!= NULL
)
761 service_user
*olds
= service
;
763 if (service
->known
!= NULL
)
764 __tdestroy (service
->known
, free
);
766 service
= service
->next
;
774 library
= top
->library
;
775 while (library
!= NULL
)
777 service_library
*oldl
= library
;
779 if (library
->lib_handle
&& library
->lib_handle
!= (void *) -1l)
780 __libc_dlclose (library
->lib_handle
);
782 library
= library
->next
;