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authorUlrich Drepper <drepper@redhat.com>1996-08-12 02:44:03 +0000
committerUlrich Drepper <drepper@redhat.com>1996-08-12 02:44:03 +0000
commita8874eadae699b5d4583aab3a860e06ecfcf5e5a (patch)
tree5165cfc605b53e459cc641ce9c2e614619ee867f /nss
parenta3e59be8d1e0dbb1d2ab25c3dc4b0ad04e159ad2 (diff)
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Last minute change.cvs/libc-ud-960811-2
Mon Aug 12 04:33:09 1996 Ulrich Drepper <drepper@cygnus.com> * nss/nsswitch.c (__nss_database_lookup): Always release locks before returning. Reported by Miles Bader. (distributes): Add databases.def.
Diffstat (limited to 'nss')
-rw-r--r--nss/Makefile5
-rw-r--r--nss/XXX-lookup.c11
-rw-r--r--nss/databases.def31
-rw-r--r--nss/nss.h54
-rw-r--r--nss/nsswitch.c116
-rw-r--r--nss/nsswitch.h15
6 files changed, 182 insertions, 50 deletions
diff --git a/nss/Makefile b/nss/Makefile
index f23f5f3fbb..5dcae4d40e 100644
--- a/nss/Makefile
+++ b/nss/Makefile
@@ -21,13 +21,16 @@
#
subdir := nss
+headers := nss.h
distribute := nsswitch.h XXX-lookup.c getXXbyYY.c getXXbyYY_r.c \
- getXXent.c getXXent_r.c
+ getXXent.c getXXent_r.c databases.def
# This is the trivial part which goes into libc itself.
routines = nsswitch $(addsuffix -lookup,$(databases))
# These are the databases that go through nss dispatch.
+# Caution: if you add a database here, you must add its real name
+# in databases.def, too.
databases = proto service hosts network grp pwd rpc ethers \
spwd
diff --git a/nss/XXX-lookup.c b/nss/XXX-lookup.c
index 4a2d25cb42..1b43018d47 100644
--- a/nss/XXX-lookup.c
+++ b/nss/XXX-lookup.c
@@ -35,25 +35,26 @@ Boston, MA 02111-1307, USA. */
#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
+#define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
#define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
#define STRINGIFY1(Name) STRINGIFY2 (Name)
#define STRINGIFY2(Name) #Name
#ifndef DEFAULT_CONFIG
-#define DEFAULT_CONFIG 0
+#define DEFAULT_CONFIG NULL
#endif
-static service_user *database = NULL;
+service_user *DATABASE_NAME_SYMBOL = NULL;
int
DB_LOOKUP_FCT (service_user **ni, const char *fct_name, void **fctp)
{
- if (database == NULL
+ if (DATABASE_NAME_SYMBOL == NULL
&& __nss_database_lookup (DATABASE_NAME_STRING, DEFAULT_CONFIG,
- &database) < 0)
+ &DATABASE_NAME_SYMBOL) < 0)
return -1;
- *ni = database;
+ *ni = DATABASE_NAME_SYMBOL;
return __nss_lookup (ni, fct_name, fctp);
}
diff --git a/nss/databases.def b/nss/databases.def
new file mode 100644
index 0000000000..98772bac76
--- /dev/null
+++ b/nss/databases.def
@@ -0,0 +1,31 @@
+/* List of all databases defined for the NSS in GNU C Library.
+Copyright (C) 1996 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.
+
+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.
+
+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. */
+
+/* This list must be kept sorted!!! */
+
+DEFINE_DATABASE (ethers)
+DEFINE_DATABASE (group)
+DEFINE_DATABASE (hosts)
+DEFINE_DATABASE (networks)
+DEFINE_DATABASE (passwd)
+DEFINE_DATABASE (protocols)
+DEFINE_DATABASE (rpc)
+DEFINE_DATABASE (services)
+DEFINE_DATABASE (shadow)
diff --git a/nss/nss.h b/nss/nss.h
new file mode 100644
index 0000000000..e9acb93bcc
--- /dev/null
+++ b/nss/nss.h
@@ -0,0 +1,54 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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.
+
+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.
+
+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. */
+
+/* Define interface to NSS. This is meant for the interface functions
+ and for implementors of new services. */
+
+#ifndef _NSS_H
+
+#define _NSS_H 1
+#include <features.h>
+
+/* Revision number of NSS interface (must be a string). */
+#define NSS_SHLIB_REVISION ".1"
+
+
+__BEGIN_DECLS
+
+/* Possible results of lookup using a nss_* function. */
+enum nss_status
+{
+ NSS_STATUS_TRYAGAIN = -2,
+ NSS_STATUS_UNAVAIL,
+ NSS_STATUS_NOTFOUND,
+ NSS_STATUS_SUCCESS,
+};
+
+
+/* Overwrite service selection for database DBNAME using specification
+ in STRING.
+ This function should only be used by system programs which have to
+ work around non-existing services (e.e., while booting).
+ Attention: Using this function repeatedly will slowly eat up the
+ whole memory since previous selection data cannot be freed. */
+extern int __nss_configure_lookup __P ((__const char *__dbname,
+ __const char *__string));
+
+__END_DECLS
+
+#endif /* nss.h */
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index 1349e0ca08..0a4c9482d2 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -19,6 +19,7 @@ Boston, MA 02111-1307, USA. */
#include <ctype.h>
#include <dlfcn.h>
+#include <errno.h>
#include <netdb.h>
#include <libc-lock.h>
#include <search.h>
@@ -30,7 +31,6 @@ Boston, MA 02111-1307, USA. */
#include "../elf/link.h" /* We need some help from ld.so. */
/* Prototypes for the local functions. */
-static void nss_init (void);
static void *nss_lookup_function (service_user *ni, const char *fct_name);
static name_database *nss_parse_file (const char *fname);
static name_database_entry *nss_getline (char *line);
@@ -39,6 +39,27 @@ static service_library *nss_new_service (name_database *database,
const char *name);
+/* Declare external database variables. */
+#define DEFINE_DATABASE(name) \
+ extern service_user *__nss_##name##_database; \
+ weak_extern (__nss_##name##_database)
+#include "databases.def"
+#undef DEFINE_DATABASE
+
+/* Structure to map database name to variable. */
+static struct
+{
+ const char *name;
+ service_user **dbp;
+} databases[] =
+{
+#define DEFINE_DATABASE(name) \
+ { #name, &__nss_##name##_database },
+#include "databases.def"
+#undef DEFINE_DATABASE
+};
+
+
__libc_lock_define_initialized (static, lock)
@@ -50,35 +71,29 @@ static int nss_initialized;
static name_database *service_table;
-static void
-nss_init (void)
-{
- /* Prevent multiple threads to change the service table. */
- __libc_lock_lock (lock);
-
- if (service_table == NULL)
- service_table = nss_parse_file (_PATH_NSSWITCH_CONF);
-
- __libc_lock_unlock (lock);
-}
-
-
/* -1 == database not found
0 == database entry pointer stored */
int
__nss_database_lookup (const char *database, const char *defconfig,
service_user **ni)
{
- name_database_entry *entry;
+ /* Prevent multiple threads to change the service table. */
+ __libc_lock_lock (lock);
- if (nss_initialized == 0)
- nss_init ();
+ /* Reconsider database variable in case some other thread called
+ `__nss_configure_lookup' while we waited for the lock. */
+ if (*ni != NULL)
+ return 0;
+
+ if (nss_initialized == 0 && service_table == NULL)
+ /* Read config file. */
+ service_table = nss_parse_file (_PATH_NSSWITCH_CONF);
/* Test whether configuration data is available. */
- if (service_table)
+ if (service_table != NULL)
{
- /* Return first `service_user' entry for DATABASE.
- XXX Will use perfect hashing function for known databases. */
+ /* Return first `service_user' entry for DATABASE. */
+ 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. */
@@ -91,17 +106,14 @@ __nss_database_lookup (const char *database, const char *defconfig,
}
/* No configuration data is available, either because nsswitch.conf
- doesn't exist or because it doesn't have a line for this database. */
- entry = malloc (sizeof *entry);
- if (entry == NULL)
- return -1;
- entry->name = database;
- /* DEFCONFIG specifies the default service list for this database,
+ doesn't exist or because it doesn't has a line for this database.
+
+ DEFCONFIG specifies the default service list for this database,
or null to use the most common default. */
- entry->service = nss_parse_service_list (defconfig ?:
- "compat [NOTFOUND=return] files");
+ *ni = nss_parse_service_list (defconfig ?: "compat [NOTFOUND=return] files");
+
+ __libc_lock_unlock (lock);
- *ni = entry->service;
return 0;
}
@@ -168,6 +180,48 @@ __nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
}
+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)
+ if (strcmp (dbname, databases[cnt].name) == 0)
+ break;
+
+ if (cnt == sizeof databases)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* Test whether it is really used. */
+ if (databases[cnt].dbp == NULL)
+ /* Nothing to do, but we could do. */
+ return 0;
+
+ /* Try to generate new data. */
+ new_db = nss_parse_service_list (service_line);
+ if (new_db == NULL)
+ {
+ /* Illegal service specification. */
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* Prevent multiple threads to change the service table. */
+ __libc_lock_lock (lock);
+
+ /* Install new rules. */
+ *databases[cnt].dbp = new_db;
+
+ __libc_lock_unlock (lock);
+
+ return 0;
+}
+
+
static int
nss_dlerror_run (void (*operate) (void))
{
@@ -385,7 +439,9 @@ nss_parse_file (const char *fname)
}
-/* Read the source names: `<source> ( "[" <status> "=" <action> "]" )*'. */
+/* Read the source names:
+ `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
+ */
static service_user *
nss_parse_service_list (const char *line)
{
diff --git a/nss/nsswitch.h b/nss/nsswitch.h
index c4d4d11193..0c99f147fd 100644
--- a/nss/nsswitch.h
+++ b/nss/nsswitch.h
@@ -23,24 +23,11 @@ Boston, MA 02111-1307, USA. */
#include <arpa/nameser.h>
#include <netinet/in.h>
+#include <nss.h>
#include <resolv.h>
#include <search.h>
-/* Revision number of NSS interface (must be a string). */
-#define NSS_SHLIB_REVISION ".1"
-
-
-/* Possible results of lookup using a nss_* function. */
-enum nss_status
-{
- NSS_STATUS_TRYAGAIN = -2,
- NSS_STATUS_UNAVAIL,
- NSS_STATUS_NOTFOUND,
- NSS_STATUS_SUCCESS,
-};
-
-
/* Actions performed after lookup finished. */
typedef enum
{