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85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
/* Mapping NSS services to action lists.
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Copyright (C) 2020-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _NSS_DATABASE_H
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#define _NSS_DATABASE_H
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#include <file_change_detection.h>
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/* Each "line" in nsswitch.conf maps a supported database (example:
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passwd) to one or more name service providers (example: files dns).
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Internally, each name service provider (example: dns) is a
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dynamically loadable module (i.e. libnss_dns.so), managed by
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nss_module.h. The sequence of providers and rules (example: files
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[SUCCESS=RETURN] dns) is mapped by nss_action.h to a cached entry
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which encodes the sequence of modules and rules. Keeping track of
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all supported databases and their corresponding actions is done
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here.
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The key entry is __nss_database_get, which provides a set of
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actions which can be used with nss_lookup_function() and
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nss_next(). Callers should assume that these functions are fast,
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and should not cache the result longer than needed. */
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#include "nss_action.h"
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/* The enumeration literal in enum nss_database for the database NAME
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(e.g., nss_database_hosts for hosts). */
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#define NSS_DATABASE_LITERAL(name) nss_database_##name
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enum nss_database
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{
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#define DEFINE_DATABASE(name) NSS_DATABASE_LITERAL (name),
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#include "databases.def"
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#undef DEFINE_DATABASE
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/* Total number of databases. */
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NSS_DATABASE_COUNT
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};
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/* Looks up the action list for DB and stores it in *ACTIONS. Returns
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true on success or false on failure. Success can mean that
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*ACTIONS is NULL. */
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bool __nss_database_get (enum nss_database db, nss_action_list *actions);
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libc_hidden_proto (__nss_database_get)
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/* Like __nss_database_get, but does not reload /etc/nsswitch.conf
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from disk. This assumes that there has been a previous successful
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__nss_database_get call (which may not have returned any data). */
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nss_action_list __nss_database_get_noreload (enum nss_database db)
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attribute_hidden;
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/* Internal type. Exposed only for fork handling purposes. */
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struct nss_database_data
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{
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struct file_change_detection nsswitch_conf;
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nss_action_list services[NSS_DATABASE_COUNT];
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int reload_disabled; /* Actually bool; int for atomic access. */
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bool initialized;
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};
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/* Called by fork in the parent process, before forking. */
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void __nss_database_fork_prepare_parent (struct nss_database_data *data)
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attribute_hidden;
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/* Called by fork in the new subprocess, after forking. */
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void __nss_database_fork_subprocess (struct nss_database_data *data)
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attribute_hidden;
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#endif /* _NSS_DATABASE_H */
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