1 /* Copyright (C) 1996-2022 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
49 int
DB_LOOKUP_FCT(nss_action_list * ni,const char * fct_name,const char * fct2_name,void ** fctp)50 DB_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 }
64 libc_hidden_def (DB_LOOKUP_FCT)
65