-/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <ctype.h>
#include <dlfcn.h>
#include <errno.h>
#include <netdb.h>
-#include <bits/libc-lock.h>
+#include <libc-lock.h>
#include <search.h>
#include <stdio.h>
+#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
-#include <ldsodefs.h> /* We need some help from ld.so. */
-#if !defined DO_STATIC_NSS || defined PIC
+#include <aliases.h>
+#include <grp.h>
+#include <netinet/ether.h>
+#include <pwd.h>
+#include <shadow.h>
+
+#if !defined DO_STATIC_NSS || defined SHARED
# include <gnu/lib-names.h>
#endif
#include "nsswitch.h"
+#include "../nscd/nscd_proto.h"
+#include <sysdep.h>
+#include <config.h>
+
+#ifdef LINK_OBSOLETE_NSL
+# define DEFAULT_CONFIG "compat [NOTFOUND=return] files"
+# define DEFAULT_DEFCONFIG "nis [NOTFOUND=return] files"
+#else
+# define DEFAULT_CONFIG "files"
+# define DEFAULT_DEFCONFIG "files"
+#endif
/* Prototypes for the local functions. */
-static name_database *nss_parse_file (const char *fname) internal_function;
-static name_database_entry *nss_getline (char *line) internal_function;
-static service_user *nss_parse_service_list (const char *line)
- internal_function;
+static name_database *nss_parse_file (const char *fname);
+static name_database_entry *nss_getline (char *line);
+static service_user *nss_parse_service_list (const char *line);
+#if !defined DO_STATIC_NSS || defined SHARED
static service_library *nss_new_service (name_database *database,
- const char *name) internal_function;
+ const char *name);
+#endif
/* Declare external database variables. */
#define DEFINE_DATABASE(name) \
- extern service_user *__nss_##name##_database; \
+ service_user *__nss_##name##_database attribute_hidden; \
weak_extern (__nss_##name##_database)
#include "databases.def"
#undef DEFINE_DATABASE
/* Structure to map database name to variable. */
-static struct
+static const struct
{
- const char *name;
+ const char name[10];
service_user **dbp;
} databases[] =
{
#include "databases.def"
#undef DEFINE_DATABASE
};
+#define ndatabases (sizeof (databases) / sizeof (databases[0]))
+
+#ifdef USE_NSCD
+/* Flags whether custom rules for database is set. */
+bool __nss_database_custom[NSS_DBSIDX_max];
+#endif
__libc_lock_define_initialized (static, lock)
-#if !defined DO_STATIC_NSS || defined PIC
+#if !defined DO_STATIC_NSS || defined SHARED
/* String with revision number of the shared object files. */
static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15;
#endif
/* The root of the whole data base. */
static name_database *service_table;
+/* List of default service lists that were generated by glibc because
+ /etc/nsswitch.conf did not provide a value.
+ The list is only maintained so we can free such service lists in
+ __libc_freeres. */
+static name_database_entry *defconfig_entries;
+
+
+#if defined USE_NSCD && (!defined DO_STATIC_NSS || defined SHARED)
+/* Nonzero if this is the nscd process. */
+static bool is_nscd;
+/* The callback passed to the init functions when nscd is used. */
+static void (*nscd_init_cb) (size_t, struct traced_file *);
+#endif
+
/* -1 == database not found
0 == database entry pointer stored */
int
-__nss_database_lookup (const char *database, const char *alternate_name,
- const char *defconfig, service_user **ni)
+__nss_database_lookup2 (const char *database, const char *alternate_name,
+ const char *defconfig, service_user **ni)
{
/* Prevent multiple threads to change the service table. */
__libc_lock_lock (lock);
}
/* No configuration data is available, either because nsswitch.conf
- doesn't exist or because it doesn't has a line for this database.
+ doesn't exist or because it doesn't have a line for this database.
DEFCONFIG specifies the default service list for this database,
or null to use the most common default. */
if (*ni == NULL)
- *ni = nss_parse_service_list (defconfig
- ?: "nis [NOTFOUND=return] files");
+ {
+ *ni = nss_parse_service_list (defconfig ?: DEFAULT_DEFCONFIG);
+ if (*ni != NULL)
+ {
+ /* Record the memory we've just allocated in defconfig_entries list,
+ so we can free it later. */
+ name_database_entry *entry;
+
+ /* Allocate ENTRY plus size of name (1 here). */
+ entry = (name_database_entry *) malloc (sizeof (*entry) + 1);
+
+ if (entry != NULL)
+ {
+ entry->next = defconfig_entries;
+ entry->service = *ni;
+ entry->name[0] = '\0';
+ defconfig_entries = entry;
+ }
+ }
+ }
__libc_lock_unlock (lock);
- return 0;
+ return *ni != NULL ? 0 : -1;
}
+libc_hidden_def (__nss_database_lookup2)
/* -1 == not found
0 == function found
1 == finished */
int
-__nss_lookup (service_user **ni, const char *fct_name, void **fctp)
+__nss_lookup (service_user **ni, const char *fct_name, const char *fct2_name,
+ void **fctp)
{
*fctp = __nss_lookup_function (*ni, fct_name);
+ if (*fctp == NULL && fct2_name != NULL)
+ *fctp = __nss_lookup_function (*ni, fct2_name);
while (*fctp == NULL
&& nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
*ni = (*ni)->next;
*fctp = __nss_lookup_function (*ni, fct_name);
+ if (*fctp == NULL && fct2_name != NULL)
+ *fctp = __nss_lookup_function (*ni, fct2_name);
}
return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1;
}
+libc_hidden_def (__nss_lookup)
/* -1 == not found
0 == adjusted for next function
1 == finished */
int
-__nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
- int all_values)
+__nss_next2 (service_user **ni, const char *fct_name, const char *fct2_name,
+ void **fctp, int status, int all_values)
{
if (all_values)
{
else
{
/* This is really only for debugging. */
- if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
- __libc_fatal ("illegal status in " __FUNCTION__);
+ if (__builtin_expect (NSS_STATUS_TRYAGAIN > status
+ || status > NSS_STATUS_RETURN, 0))
+ __libc_fatal ("Illegal status in __nss_next.\n");
if (nss_next_action (*ni, status) == NSS_ACTION_RETURN)
return 1;
*ni = (*ni)->next;
*fctp = __nss_lookup_function (*ni, fct_name);
+ if (*fctp == NULL && fct2_name != NULL)
+ *fctp = __nss_lookup_function (*ni, fct2_name);
}
while (*fctp == NULL
&& nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
return *fctp != NULL ? 0 : -1;
}
-
+libc_hidden_def (__nss_next2)
int
__nss_configure_lookup (const char *dbname, const char *service_line)
service_user *new_db;
size_t cnt;
- for (cnt = 0; cnt < sizeof databases; ++cnt)
+ for (cnt = 0; cnt < ndatabases; ++cnt)
{
int cmp = strcmp (dbname, databases[cnt].name);
if (cmp == 0)
}
}
- if (cnt == sizeof databases)
+ if (cnt == ndatabases)
{
__set_errno (EINVAL);
return -1;
/* Install new rules. */
*databases[cnt].dbp = new_db;
+#ifdef USE_NSCD
+ __nss_database_custom[cnt] = true;
+#endif
__libc_lock_unlock (lock);
}
-#if !defined DO_STATIC_NSS || defined PIC
+/* Comparison function for searching NI->known tree. */
static int
-nss_dlerror_run (void (*operate) (void *), void *args)
+known_compare (const void *p1, const void *p2)
{
- char *last_errstring = NULL;
- int result;
-
- (void) _dl_catch_error (&last_errstring, operate, args);
-
- result = last_errstring != NULL;
- if (result)
- free (last_errstring);
-
- return result;
+ return p1 == p2 ? 0 : strcmp (*(const char *const *) p1,
+ *(const char *const *) p2);
}
-struct do_open_args
-{
- /* Argument to do_open. */
- char *shlib_name;
- service_user *ni;
-};
-
-struct get_sym_args
+#if !defined DO_STATIC_NSS || defined SHARED
+/* Load library. */
+static int
+nss_load_library (service_user *ni)
{
- /* Arguments to get_sym. */
- struct link_map *map;
- char *name;
-
- /* Return values of get_sym. */
- ElfW(Addr) loadbase;
- const ElfW(Sym) *ref;
-};
+ if (ni->library == NULL)
+ {
+ /* This service has not yet been used. Fetch the service
+ library for it, creating a new one if need be. If there
+ is no service table from the file, this static variable
+ holds the head of the service_library list made from the
+ default configuration. */
+ static name_database default_table;
+ ni->library = nss_new_service (service_table ?: &default_table,
+ ni->name);
+ if (ni->library == NULL)
+ return -1;
+ }
-static void
-do_open (void *a)
-{
- struct do_open_args *args = (struct do_open_args *) a;
- /* Open and relocate the shared object. */
- args->ni->library->lib_handle = _dl_open (args->shlib_name, RTLD_LAZY, NULL);
-}
+ if (ni->library->lib_handle == NULL)
+ {
+ /* Load the shared library. */
+ size_t shlen = (7 + strlen (ni->name) + 3
+ + strlen (__nss_shlib_revision) + 1);
+ int saved_errno = errno;
+ char shlib_name[shlen];
+
+ /* Construct shared object name. */
+ __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name,
+ "libnss_"),
+ ni->name),
+ ".so"),
+ __nss_shlib_revision);
+
+ ni->library->lib_handle = __libc_dlopen (shlib_name);
+ if (ni->library->lib_handle == NULL)
+ {
+ /* Failed to load the library. */
+ ni->library->lib_handle = (void *) -1l;
+ __set_errno (saved_errno);
+ }
+# ifdef USE_NSCD
+ else if (is_nscd)
+ {
+ /* Call the init function when nscd is used. */
+ size_t initlen = (5 + strlen (ni->name)
+ + strlen ("_init") + 1);
+ char init_name[initlen];
+
+ /* Construct the init function name. */
+ __stpcpy (__stpcpy (__stpcpy (init_name,
+ "_nss_"),
+ ni->name),
+ "_init");
+
+ /* Find the optional init function. */
+ void (*ifct) (void (*) (size_t, struct traced_file *))
+ = __libc_dlsym (ni->library->lib_handle, init_name);
+ if (ifct != NULL)
+ {
+ void (*cb) (size_t, struct traced_file *) = nscd_init_cb;
+# ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (cb);
+# endif
+ ifct (cb);
+ }
+ }
+# endif
+ }
-static void
-get_sym (void *a)
-{
- struct get_sym_args *args = (struct get_sym_args *) a;
- args->ref = NULL;
- args->loadbase = _dl_lookup_symbol (args->name, &args->ref,
- args->map->l_local_scope,
- args->map->l_name, 0);
+ return 0;
}
#endif
-/* Comparison function for searching NI->known tree. */
-static int
-known_compare (const void *p1, const void *p2)
-{
- return p1 == p2 ? 0 : strcmp (*(const char *const *) p1,
- *(const char *const *) p2);
-}
-
void *
__nss_lookup_function (service_user *ni, const char *fct_name)
enough to a pointer to our structure to use as a lookup key that
will be passed to `known_compare' (above). */
- found = __tsearch (&fct_name, (void **) &ni->known, &known_compare);
- if (*found != &fct_name)
- /* The search found an existing structure in the tree. */
- result = ((known_function *) *found)->fct_ptr;
+ found = __tsearch (&fct_name, &ni->known, &known_compare);
+ if (found == NULL)
+ /* This means out-of-memory. */
+ result = NULL;
+ else if (*found != &fct_name)
+ {
+ /* The search found an existing structure in the tree. */
+ result = ((known_function *) *found)->fct_ptr;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (result);
+#endif
+ }
else
{
/* This name was not known before. Now we have a node in the tree
known_function *known = malloc (sizeof *known);
if (! known)
{
+#if !defined DO_STATIC_NSS || defined SHARED
remove_from_tree:
+#endif
/* Oops. We can't instantiate this node properly.
Remove it from the tree. */
- __tdelete (&fct_name, (void **) &ni->known, &known_compare);
+ __tdelete (&fct_name, &ni->known, &known_compare);
+ free (known);
result = NULL;
}
else
*found = known;
known->fct_name = fct_name;
- if (ni->library == NULL)
- {
- /* This service has not yet been used. Fetch the service
- library for it, creating a new one if need be. If there
- is no service table from the file, this static variable
- holds the head of the service_library list made from the
- default configuration. */
- static name_database default_table;
- ni->library = nss_new_service (service_table ?: &default_table,
- ni->name);
- if (ni->library == NULL)
- {
- /* This only happens when out of memory. */
- free (known);
- goto remove_from_tree;
- }
- }
-
-#if !defined DO_STATIC_NSS || defined PIC
- if (ni->library->lib_handle == NULL)
- {
- /* Load the shared library. */
- size_t shlen = (7 + strlen (ni->library->name) + 3
- + strlen (__nss_shlib_revision) + 1);
- int saved_errno = errno;
- struct do_open_args args;
- args.shlib_name = __alloca (shlen);
- args.ni = ni;
-
- /* Construct shared object name. */
- __stpcpy (__stpcpy (__stpcpy (__stpcpy (args.shlib_name,
- "libnss_"),
- ni->library->name),
- ".so"),
- __nss_shlib_revision);
-
- if (nss_dlerror_run (do_open, &args) != 0)
- {
- /* Failed to load the library. */
- ni->library->lib_handle = (void *) -1l;
- __set_errno (saved_errno);
- }
- }
+#if !defined DO_STATIC_NSS || defined SHARED
+ /* Load the appropriate library. */
+ if (nss_load_library (ni) != 0)
+ /* This only happens when out of memory. */
+ goto remove_from_tree;
if (ni->library->lib_handle == (void *) -1l)
/* Library not found => function not found. */
result = NULL;
else
{
- /* Get the desired function. Again, GNU ld.so magic ahead. */
- size_t namlen = (5 + strlen (ni->library->name) + 1
+ /* Get the desired function. */
+ size_t namlen = (5 + strlen (ni->name) + 1
+ strlen (fct_name) + 1);
- struct get_sym_args args;
- args.name = __alloca (namlen);
- args.map = ni->library->lib_handle;
+ char name[namlen];
/* Construct the function name. */
- __stpcpy (__stpcpy (__stpcpy (__stpcpy (args.name, "_nss_"),
- ni->library->name),
+ __stpcpy (__stpcpy (__stpcpy (__stpcpy (name, "_nss_"),
+ ni->name),
"_"),
fct_name);
/* Look up the symbol. */
- result = (nss_dlerror_run (get_sym, &args) ? NULL
- : (void *) (args.loadbase + args.ref->st_value));
+ result = __libc_dlsym (ni->library->lib_handle, name);
}
#else
/* We can't get function address dynamically in static linking. */
{
-# define DEFINE_ENT(h,nm) \
- extern void _nss_##h##_get##nm##ent_r (void); \
- extern void _nss_##h##_end##nm##ent (void); \
- extern void _nss_##h##_set##nm##ent (void);
-# define DEFINE_GET(h,nm) \
- extern void _nss_##h##_get##nm##_r (void);
-# define DEFINE_GETBY(h,nm,ky) \
- extern void _nss_##h##_get##nm##by##ky##_r (void);
-# include "function.def"
-# undef DEFINE_ENT
-# undef DEFINE_GET
-# undef DEFINE_GETBY
# define DEFINE_ENT(h,nm) \
{ #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r }, \
{ #h"_end"#nm"ent", _nss_##h##_end##nm##ent }, \
# include "function.def"
{ NULL, NULL }
};
- size_t namlen = (5 + strlen (ni->library->name) + 1
+ size_t namlen = (5 + strlen (ni->name) + 1
+ strlen (fct_name) + 1);
char name[namlen];
/* Construct the function name. */
- __stpcpy (__stpcpy (__stpcpy (name, ni->library->name),
+ __stpcpy (__stpcpy (__stpcpy (name, ni->name),
"_"),
fct_name);
/* Remember function pointer for later calls. Even if null, we
record it so a second try needn't search the library again. */
known->fct_ptr = result;
+#ifdef PTR_MANGLE
+ PTR_MANGLE (known->fct_ptr);
+#endif
}
}
return result;
}
+libc_hidden_def (__nss_lookup_function)
static name_database *
-internal_function
nss_parse_file (const char *fname)
{
FILE *fp;
size_t len;
/* Open the configuration file. */
- fp = fopen (fname, "r");
+ fp = fopen (fname, "rce");
if (fp == NULL)
return NULL;
+ /* No threads use this stream. */
+ __fsetlocking (fp, FSETLOCKING_BYCALLER);
+
result = (name_database *) malloc (sizeof (name_database));
if (result == NULL)
- return NULL;
+ {
+ fclose (fp);
+ return NULL;
+ }
result->entry = NULL;
result->library = NULL;
last = this;
}
}
- while (!feof_unlocked (fp));
+ while (!__feof_unlocked (fp));
/* Free the buffer. */
free (line);
`( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
*/
static service_user *
-internal_function
nss_parse_service_list (const char *line)
{
service_user *result = NULL, **nextp = &result;
else if (__strncasecmp (name, "UNAVAIL", 7) == 0)
status = NSS_STATUS_UNAVAIL;
else
- return result;
+ goto finish;
}
else if (line - name == 8)
{
else if (__strncasecmp (name, "TRYAGAIN", 8) == 0)
status = NSS_STATUS_TRYAGAIN;
else
- return result;
+ goto finish;
}
else
- return result;
+ goto finish;
while (isspace (line[0]))
++line;
if (line[0] != '=')
- return result;
+ goto finish;
do
++line;
while (isspace (line[0]));
else if (line - name == 8
&& __strncasecmp (name, "CONTINUE", 8) == 0)
action = NSS_ACTION_CONTINUE;
+ else if (line - name == 5
+ && __strncasecmp (name, "MERGE", 5) == 0)
+ action = NSS_ACTION_MERGE;
else
- return result;
+ goto finish;
if (not)
{
*nextp = new_service;
nextp = &new_service->next;
+ continue;
+
+ finish:
+ free (new_service);
+ return result;
}
}
static name_database_entry *
-internal_function
nss_getline (char *line)
{
const char *name;
}
+#if !defined DO_STATIC_NSS || defined SHARED
static service_library *
-internal_function
nss_new_service (name_database *database, const char *name)
{
service_library **currentp = &database->library;
return *currentp;
}
+#endif
+
+
+#if defined SHARED && defined USE_NSCD
+/* Load all libraries for the service. */
+static void
+nss_load_all_libraries (const char *service, const char *def)
+{
+ service_user *ni = NULL;
+
+ if (__nss_database_lookup2 (service, NULL, def, &ni) == 0)
+ while (ni != NULL)
+ {
+ nss_load_library (ni);
+ ni = ni->next;
+ }
+}
+
+
+/* Called by nscd and nscd alone. */
+void
+__nss_disable_nscd (void (*cb) (size_t, struct traced_file *))
+{
+# ifdef PTR_MANGLE
+ PTR_MANGLE (cb);
+# endif
+ nscd_init_cb = cb;
+ is_nscd = true;
+
+ /* Find all the relevant modules so that the init functions are called. */
+ nss_load_all_libraries ("passwd", DEFAULT_CONFIG);
+ nss_load_all_libraries ("group", DEFAULT_CONFIG);
+ nss_load_all_libraries ("hosts", "dns [!UNAVAIL=return] files");
+ nss_load_all_libraries ("services", NULL);
+
+ /* Disable all uses of NSCD. */
+ __nss_not_use_nscd_passwd = -1;
+ __nss_not_use_nscd_group = -1;
+ __nss_not_use_nscd_hosts = -1;
+ __nss_not_use_nscd_services = -1;
+ __nss_not_use_nscd_netgroup = -1;
+}
+#endif
+
+static void
+free_database_entries (name_database_entry *entry)
+{
+ while (entry != NULL)
+ {
+ name_database_entry *olde = entry;
+ service_user *service = entry->service;
+
+ while (service != NULL)
+ {
+ service_user *olds = service;
+
+ if (service->known != NULL)
+ __tdestroy (service->known, free);
+
+ service = service->next;
+ free (olds);
+ }
+
+ entry = entry->next;
+ free (olde);
+ }
+}
+
+/* Free all resources if necessary. */
+libc_freeres_fn (free_defconfig)
+{
+ name_database_entry *entry = defconfig_entries;
+
+ if (entry == NULL)
+ /* defconfig was not used. */
+ return;
+
+ /* Don't disturb ongoing other threads (if there are any). */
+ defconfig_entries = NULL;
+
+ free_database_entries (entry);
+}
+
+libc_freeres_fn (free_mem)
+{
+ name_database *top = service_table;
+ service_library *library;
+
+ if (top == NULL)
+ /* Maybe we have not read the nsswitch.conf file. */
+ return;
+
+ /* Don't disturb ongoing other threads (if there are any). */
+ service_table = NULL;
+
+ free_database_entries (top->entry);
+
+ library = top->library;
+ while (library != NULL)
+ {
+ service_library *oldl = library;
+
+ if (library->lib_handle && library->lib_handle != (void *) -1l)
+ __libc_dlclose (library->lib_handle);
+
+ library = library->next;
+ free (oldl);
+ }
+
+ free (top);
+}
projects / thirdparty / glibc.git / blobdiff