1/* Copyright (C) 1996-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <assert.h>
19#include "nsswitch.h"
20
21/*******************************************************************\
22|* Here we assume one symbol to be defined: *|
23|* *|
24|* DATABASE_NAME - name of the database the function accesses *|
25|* (e.g., hosts, services, ...) *|
26|* *|
27|* One additional symbol may optionally be defined: *|
28|* *|
29|* ALTERNATE_NAME - name of another service which is examined in *|
30|* case DATABASE_NAME is not found *|
31|* *|
32|* DEFAULT_CONFIG - string for default conf (e.g. "files dns") *|
33|* *|
34\*******************************************************************/
35
36#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
37#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
38#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
39
40#define DATABASE_NAME_ID CONCAT2_1 (nss_database_, DATABASE_NAME)
41#define CONCAT2_1(Pre, Name) CONCAT2_2 (Pre, Name)
42#define CONCAT2_2(Pre, Name) Pre##Name
43
44#define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
45#define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
46#define STRINGIFY1(Name) STRINGIFY2 (Name)
47#define STRINGIFY2(Name) #Name
48
49int
50DB_LOOKUP_FCT (nss_action_list *ni, const char *fct_name, const char *fct2_name,
51 void **fctp)
52{
53 if (! __nss_database_get (DATABASE_NAME_ID, &DATABASE_NAME_SYMBOL))
54 return -1;
55
56 *ni = DATABASE_NAME_SYMBOL;
57
58 /* We want to know about it if we've somehow got a NULL action list;
59 in the past, we had bad state if seccomp interfered with setup. */
60 assert(*ni != NULL);
61
62 return __nss_lookup (ni, fct_name, fct2_name, fctp);
63}
64libc_hidden_def (DB_LOOKUP_FCT)
65