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commit dc9b69d5331dcdca4547c0490cb9fefbd89e40f6
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Dec 17 12:01:20 2021 +0100
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nss: Use "files dns" as the default for the hosts database (bug 28700)
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This matches what is currently in nss/nsswitch.conf. The new ordering
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matches what most distributions use in their installed configuration
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files.
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It is common to add localhost to /etc/hosts because the name does not
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exist in the DNS, but is commonly used as a host name.
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With the built-in "dns [!UNAVAIL=return] files" default, dns is
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searched first and provides an answer for "localhost" (NXDOMAIN).
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We never look at the files database as a result, so the contents of
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/etc/hosts is ignored. This means that "getent hosts localhost"
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fail without a /etc/nsswitch.conf file, even though the host name
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is listed in /etc/hosts.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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(cherry picked from commit b99b0f93ee8762fe53ff65802deb6f00700b9924)
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diff --git a/manual/nss.texi b/manual/nss.texi
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index 3aaa7786f8cf3168..524d22ad1e7f8ca0 100644
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--- a/manual/nss.texi
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+++ b/manual/nss.texi
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@@ -324,9 +324,8 @@ missing.
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@cindex default value, and NSS
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For the @code{hosts} and @code{networks} databases the default value is
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-@code{dns [!UNAVAIL=return] files}. I.e., the system is prepared for
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-the DNS service not to be available but if it is available the answer it
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-returns is definitive.
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+@code{files dns}. I.e., local configuration will override the contents
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+of the domain name system (DNS).
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The @code{passwd}, @code{group}, and @code{shadow} databases was
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traditionally handled in a special way. The appropriate files in the
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diff --git a/nss/XXX-lookup.c b/nss/XXX-lookup.c
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index f1c97f7c8e9d7378..dbc87868dd408d9f 100644
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--- a/nss/XXX-lookup.c
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+++ b/nss/XXX-lookup.c
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@@ -29,7 +29,7 @@
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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. "dns files") *|
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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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diff --git a/nss/nss_database.c b/nss/nss_database.c
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index ab121cb371c087e9..54561f03287db2e4 100644
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--- a/nss/nss_database.c
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+++ b/nss/nss_database.c
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@@ -80,7 +80,7 @@ enum nss_database_default
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{
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nss_database_default_defconfig = 0, /* "nis [NOTFOUND=return] files". */
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nss_database_default_compat, /* "compat [NOTFOUND=return] files". */
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- nss_database_default_dns, /* "dns [!UNAVAIL=return] files". */
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+ nss_database_default_dns, /* "files dns". */
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nss_database_default_files, /* "files". */
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nss_database_default_nis, /* "nis". */
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nss_database_default_nis_nisplus, /* "nis nisplus". */
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@@ -133,7 +133,7 @@ nss_database_select_default (struct nss_database_default_cache *cache,
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#endif
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case nss_database_default_dns:
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- line = "dns [!UNAVAIL=return] files";
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+ line = "files dns";
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break;
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case nss_database_default_files:
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