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dc9b69d533
This matches what is currently in nss/nsswitch.conf. The new ordering
matches what most distributions use in their installed configuration
files.
It is common to add localhost to /etc/hosts because the name does not
exist in the DNS, but is commonly used as a host name.
With the built-in "dns [!UNAVAIL=return] files" default, dns is
searched first and provides an answer for "localhost" (NXDOMAIN).
We never look at the files database as a result, so the contents of
/etc/hosts is ignored. This means that "getent hosts localhost"
fail without a /etc/nsswitch.conf file, even though the host name
is listed in /etc/hosts.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit b99b0f93ee)
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/* Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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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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#include "nsswitch.h"
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/*******************************************************************\
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|* Here we assume one symbol to be defined: *|
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|* *|
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|* DATABASE_NAME - name of the database the function accesses *|
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|* (e.g., hosts, services, ...) *|
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|* *|
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|* One additional symbol may optionally be defined: *|
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|* *|
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|* ALTERNATE_NAME - name of another service which is examined in *|
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|* case DATABASE_NAME is not found *|
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|* *|
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|* DEFAULT_CONFIG - string for default conf (e.g. "files dns") *|
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|* *|
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\*******************************************************************/
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#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
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#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
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#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
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#define DATABASE_NAME_ID CONCAT2_1 (nss_database_, DATABASE_NAME)
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#define CONCAT2_1(Pre, Name) CONCAT2_2 (Pre, Name)
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#define CONCAT2_2(Pre, Name) Pre##Name
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#define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
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#define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
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#define STRINGIFY1(Name) STRINGIFY2 (Name)
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#define STRINGIFY2(Name) #Name
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int
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DB_LOOKUP_FCT (nss_action_list *ni, const char *fct_name, const char *fct2_name,
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void **fctp)
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{
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if (! __nss_database_get (DATABASE_NAME_ID, &DATABASE_NAME_SYMBOL))
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return -1;
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*ni = DATABASE_NAME_SYMBOL;
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return __nss_lookup (ni, fct_name, fct2_name, fctp);
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}
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libc_hidden_def (DB_LOOKUP_FCT)
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