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authorRoland McGrath <roland@gnu.org>1996-06-25 10:20:09 +0000
committerRoland McGrath <roland@gnu.org>1996-06-25 10:20:09 +0000
commitc66273aae5213e7e4460631e6b823dc2bf8a79d1 (patch)
treec5aa151e2bd9b5373cd01cce47210a7cf512a31c /nss/nsswitch.c
parent5f0e6fc702296840d2daa39f83f6cb1e40073d58 (diff)
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* nss/nss_files/files-parse.c (parse_list): Reset ELT for elements
after the first! * nss/nsswitch.c (__nss_database_lookup): If nsswitch.conf is missing or doesn't mention DATABASE, use an internal default equivalent to "DATABASE: compat [NOTFOUND=return] dns [NOTFOUND=return] files". (nss_lookup_function): Call nss_new_service as needed. (nss_parse_file): Don't bother calling nss_new_service here. * grp/fgetgrent.c (LINE_PARSER): Pass zero SWALLOW arg for fields. * pwd/fgetpwent.c: Likewise.
Diffstat (limited to 'nss/nsswitch.c')
-rw-r--r--nss/nsswitch.c89
1 files changed, 56 insertions, 33 deletions
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index 4c2ccf692f..2b3ae0bbe1 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -86,29 +86,50 @@ nss_init (void)
int
__nss_database_lookup (const char *database, service_user **ni)
{
- /* Return first `service_user' entry for DATABASE.
- XXX Will use perfect hashing function for known databases. */
- name_database_entry *entry;
+ if (nss_initialized == 0)
+ nss_init ();
/* Test whether configuration data is available. */
- if (service_table == NULL)
+ if (service_table)
{
- if (nss_initialized == 0)
- nss_init ();
-
- if (service_table == NULL)
- return -1;
+ /* Return first `service_user' entry for DATABASE.
+ XXX Will use perfect hashing function for known databases. */
+ name_database_entry *entry;
+
+ /* XXX Could use some faster mechanism here. But each database is
+ only requested once and so this might not be critical. */
+ for (entry = service_table->entry; entry != NULL; entry = entry->next)
+ if (strcmp (database, entry->name) == 0)
+ {
+ *ni = entry->service;
+ return 0;
+ }
}
- /* XXX Could use some faster mechanism here. But each database is
- only requested once and so this might not be critical. */
- for (entry = service_table->entry; entry != NULL; entry = entry->next)
- if (strcmp (database, entry->name) == 0)
- break;
-
- if (entry == NULL || (*ni = entry->service) == NULL)
- return -1;
-
+ /* No configuration data is available, either because nsswitch.conf
+ doesn't exist or because it doesn't have a line for this database.
+ Use a default equivalent to:
+ database: compat [NOTFOUND=return] dns [NOTFOUND=return] files
+ */
+ {
+#define DEFAULT_SERVICE(name, next) \
+ static service_user default_##name = \
+ { \
+ #name, \
+ { \
+ NSS_ACTION_CONTINUE, \
+ NSS_ACTION_CONTINUE, \
+ NSS_ACTION_RETURN, \
+ NSS_ACTION_RETURN, \
+ }, \
+ NULL, NULL, \
+ next \
+ }
+ DEFAULT_SERVICE (files, NULL);
+ DEFAULT_SERVICE (dns, &default_files);
+ DEFAULT_SERVICE (compat, &default_dns);
+ *ni = &default_compat;
+ }
return 0;
}
@@ -196,15 +217,26 @@ nss_lookup_function (service_user *ni, const char *fct_name)
if (nss_find_entry (&ni->known, fct_name, &result) >= 0)
return result;
- /* If we failed to allocate the needed data structures for the
- service return an error. This should only happen when we are out
- of memory. */
- if (ni->library == NULL)
- return NULL;
-
/* We now modify global data. Protect it. */
__libc_lock_lock (lock);
+ 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. */
+ __libc_lock_unlock (lock);
+ return NULL;
+ }
+ }
+
if (ni->library->lib_handle == NULL)
{
/* Load the shared library. */
@@ -374,15 +406,6 @@ nss_parse_file (const char *fname)
/* Close configuration file. */
fclose (fp);
- /* Now create for each service we could use an entry in LIBRARY list. */
- for (last = result->entry; last != NULL; last = last->next)
- {
- service_user *runp;
-
- for (runp = last->service; runp != NULL; runp = runp->next)
- runp->library = nss_new_service (result, runp->name);
- }
-
return result;
}