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-rw-r--r--nss/nsswitch.c165
1 files changed, 122 insertions, 43 deletions
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index 92e6f5f91f..6c15c3a83f 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1996-1999,2001-2007,2009,2010 Free Software Foundation, Inc.
+/* Copyright (C) 1996-1999,2001-2007,2009,2010,2011
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@@ -40,6 +41,7 @@
#include "nsswitch.h"
#include "../nscd/nscd_proto.h"
+#include <sysdep.h>
/* Prototypes for the local functions. */
static name_database *nss_parse_file (const char *fname) internal_function;
@@ -86,6 +88,12 @@ static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15;
static name_database *service_table;
+/* 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 *);
+
+
/* -1 == database not found
0 == database entry pointer stored */
int
@@ -129,7 +137,7 @@ __nss_database_lookup (const char *database, const char *alternate_name,
}
/* 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. */
@@ -285,6 +293,79 @@ known_compare (const void *p1, const void *p2)
}
+#if !defined DO_STATIC_NSS || defined SHARED
+/* Load library. */
+static int
+nss_load_library (service_user *ni)
+{
+ 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;
+ }
+
+ 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;
+ char shlib_name[shlen];
+
+ /* Construct shared object name. */
+ __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name,
+ "libnss_"),
+ ni->library->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);
+ }
+ else if (is_nscd)
+ {
+ /* Call the init function when nscd is used. */
+ size_t initlen = (5 + strlen (ni->library->name)
+ + strlen ("_init") + 1);
+ char init_name[initlen];
+
+ /* Construct the init function name. */
+ __stpcpy (__stpcpy (__stpcpy (init_name,
+ "_nss_"),
+ ni->library->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);
+ }
+ }
+ }
+
+ return 0;
+}
+#endif
+
+
void *
__nss_lookup_function (service_user *ni, const char *fct_name)
{
@@ -331,47 +412,13 @@ __nss_lookup_function (service_user *ni, const char *fct_name)
*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 SHARED
- if (ni->library->lib_handle == NULL)
+ /* Load the appropriate library. */
+ if (nss_load_library (ni) != 0)
{
- /* Load the shared library. */
- size_t shlen = (7 + strlen (ni->library->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->library->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);
- }
+ /* This only happens when out of memory. */
+ free (known);
+ goto remove_from_tree;
}
if (ni->library->lib_handle == (void *) -1l)
@@ -463,7 +510,10 @@ nss_parse_file (const char *fname)
result = (name_database *) malloc (sizeof (name_database));
if (result == NULL)
- return NULL;
+ {
+ fclose (fp);
+ return NULL;
+ }
result->entry = NULL;
result->library = NULL;
@@ -724,16 +774,45 @@ nss_new_service (name_database *database, const char *name)
}
+#ifdef SHARED
+/* 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_lookup (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)
+__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", "compat [NOTFOUND=return] files");
+ nss_load_all_libraries ("group", "compat [NOTFOUND=return] files");
+ 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;
}
+#endif
/* Free all resources if necessary. */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-14 11:55:49 +0000