Merge branch 'notsystemd/postmove' into notsystemd/master

# Conflicts:
#	src/grp-journal/libjournal-core/.gitignore
#	src/grp-system/libcore/include/core/mount.h

4 files changed, 696 insertions, 0 deletions

diff --git a/src/nss-systemd/Makefile b/src/nss-systemd/Makefile
new file mode 100644
index 0000000000..90bd0ce886
--- /dev/null
+++ b/src/nss-systemd/Makefile
@@ -0,0 +1,45 @@
+#  -*- Mode: makefile; indent-tabs-mode: t -*-
+#
+#  This file is part of systemd.
+#
+#  Copyright 2010-2012 Lennart Poettering
+#  Copyright 2010-2012 Kay Sievers
+#  Copyright 2013 Zbigniew Jędrzejewski-Szmek
+#  Copyright 2013 David Strauss
+#  Copyright 2016 Luke Shumaker
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+#  systemd is distributed in the hope that it will be useful, but
+#  WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public License
+#  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+include $(dir $(lastword $(MAKEFILE_LIST)))/../../config.mk
+include $(topsrcdir)/build-aux/Makefile.head.mk
+
+libnss_systemd_la_SOURCES = \
+	src/nss-systemd/nss-systemd.sym \
+	src/nss-systemd/nss-systemd.c
+
+libnss_systemd_la_LDFLAGS = \
+	-module \
+	-export-dynamic \
+	-avoid-version \
+	-shared \
+	-shrext .so.2 \
+	-Wl,--version-script=$(srcdir)/nss-systemd.sym
+
+libnss_systemd_la_LIBADD = \
+	libsystemd-internal.la \
+	libsystemd-basic.la
+
+rootlib_LTLIBRARIES += \
+	libnss_systemd.la
+
+include $(topsrcdir)/build-aux/Makefile.tail.mk
diff --git a/src/nss-systemd/nss-systemd.c b/src/nss-systemd/nss-systemd.c
new file mode 100644
index 0000000000..b23f805631
--- /dev/null
+++ b/src/nss-systemd/nss-systemd.c
@@ -0,0 +1,523 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2016 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <nss.h>
+
+#include <systemd/sd-bus.h>
+
+#include "sd-bus/bus-common-errors.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/env-util.h"
+#include "systemd-basic/fs-util.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/nss-util.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/stdio-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-basic/util.h"
+
+#ifndef NOBODY_USER_NAME
+#define NOBODY_USER_NAME "nobody"
+#endif
+
+#ifndef NOBODY_GROUP_NAME
+#define NOBODY_GROUP_NAME "nobody"
+#endif
+
+static const struct passwd root_passwd = {
+        .pw_name = (char*) "root",
+        .pw_passwd = (char*) "x", /* see shadow file */
+        .pw_uid = 0,
+        .pw_gid = 0,
+        .pw_gecos = (char*) "Super User",
+        .pw_dir = (char*) "/root",
+        .pw_shell = (char*) "/bin/sh",
+};
+
+static const struct passwd nobody_passwd = {
+        .pw_name = (char*) NOBODY_USER_NAME,
+        .pw_passwd = (char*) "*", /* locked */
+        .pw_uid = 65534,
+        .pw_gid = 65534,
+        .pw_gecos = (char*) "User Nobody",
+        .pw_dir = (char*) "/",
+        .pw_shell = (char*) "/sbin/nologin",
+};
+
+static const struct group root_group = {
+        .gr_name = (char*) "root",
+        .gr_gid = 0,
+        .gr_passwd = (char*) "x", /* see shadow file */
+        .gr_mem = (char*[]) { NULL },
+};
+
+static const struct group nobody_group = {
+        .gr_name = (char*) NOBODY_GROUP_NAME,
+        .gr_gid = 65534,
+        .gr_passwd = (char*) "*", /* locked */
+        .gr_mem = (char*[]) { NULL },
+};
+
+NSS_GETPW_PROTOTYPES(systemd);
+NSS_GETGR_PROTOTYPES(systemd);
+
+static int direct_lookup_name(const char *name, uid_t *ret) {
+        _cleanup_free_ char *s = NULL;
+        const char *path;
+        int r;
+
+        assert(name);
+
+        /* Normally, we go via the bus to resolve names. That has the benefit that it is available from any mount
+         * namespace and subject to proper authentication. However, there's one problem: if our module is called from
+         * dbus-daemon itself we really can't use D-Bus to communicate. In this case, resort to a client-side hack,
+         * and look for the dynamic names directly. This is pretty ugly, but breaks the cyclic dependency. */
+
+        path = strjoina("/run/systemd/dynamic-uid/direct:", name);
+        r = readlink_malloc(path, &s);
+        if (r < 0)
+                return r;
+
+        return parse_uid(s, ret);
+}
+
+static int direct_lookup_uid(uid_t uid, char **ret) {
+        char path[strlen("/run/systemd/dynamic-uid/direct:") + DECIMAL_STR_MAX(uid_t) + 1], *s;
+        int r;
+
+        xsprintf(path, "/run/systemd/dynamic-uid/direct:" UID_FMT, uid);
+
+        r = readlink_malloc(path, &s);
+        if (r < 0)
+                return r;
+        if (!valid_user_group_name(s)) { /* extra safety check */
+                free(s);
+                return -EINVAL;
+        }
+
+        *ret = s;
+        return 0;
+}
+
+enum nss_status _nss_systemd_getpwnam_r(
+                const char *name,
+                struct passwd *pwd,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        uint32_t translated;
+        size_t l;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        assert(name);
+        assert(pwd);
+
+        if (!valid_user_group_name(name)) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        /* Synthesize entries for the root and nobody users, in case they are missing in /etc/passwd */
+        if (streq(name, root_passwd.pw_name)) {
+                *pwd = root_passwd;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+        if (streq(name, nobody_passwd.pw_name)) {
+                *pwd = nobody_passwd;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+
+        /* Make sure that we don't go in circles when allocating a dynamic UID by checking our own database */
+        if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
+                goto not_found;
+
+        if (getenv_bool("SYSTEMD_NSS_BYPASS_BUS") > 0) {
+
+                /* Access the dynamic UID allocation directly if we are called from dbus-daemon, see above. */
+                r = direct_lookup_name(name, (uid_t*) &translated);
+                if (r == -ENOENT)
+                        goto not_found;
+                if (r < 0)
+                        goto fail;
+
+        } else {
+                _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+                _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+
+                r = sd_bus_open_system(&bus);
+                if (r < 0)
+                        goto fail;
+
+                r = sd_bus_call_method(bus,
+                                       "org.freedesktop.systemd1",
+                                       "/org/freedesktop/systemd1",
+                                       "org.freedesktop.systemd1.Manager",
+                                       "LookupDynamicUserByName",
+                                       &error,
+                                       &reply,
+                                       "s",
+                                       name);
+                if (r < 0) {
+                        if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
+                                goto not_found;
+
+                        goto fail;
+                }
+
+                r = sd_bus_message_read(reply, "u", &translated);
+                if (r < 0)
+                        goto fail;
+        }
+
+        l = strlen(name);
+        if (buflen < l+1) {
+                *errnop = ENOMEM;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        memcpy(buffer, name, l+1);
+
+        pwd->pw_name = buffer;
+        pwd->pw_uid = (uid_t) translated;
+        pwd->pw_gid = (uid_t) translated;
+        pwd->pw_gecos = (char*) "Dynamic User";
+        pwd->pw_passwd = (char*) "*"; /* locked */
+        pwd->pw_dir = (char*) "/";
+        pwd->pw_shell = (char*) "/sbin/nologin";
+
+        *errnop = 0;
+        return NSS_STATUS_SUCCESS;
+
+not_found:
+        *errnop = 0;
+        return NSS_STATUS_NOTFOUND;
+
+fail:
+        *errnop = -r;
+        return NSS_STATUS_UNAVAIL;
+}
+
+enum nss_status _nss_systemd_getpwuid_r(
+                uid_t uid,
+                struct passwd *pwd,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_free_ char *direct = NULL;
+        const char *translated;
+        size_t l;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        if (!uid_is_valid(uid)) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        /* Synthesize data for the root user and for nobody in case they are missing from /etc/passwd */
+        if (uid == root_passwd.pw_uid) {
+                *pwd = root_passwd;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+        if (uid == nobody_passwd.pw_uid) {
+                *pwd = nobody_passwd;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+
+        if (uid <= SYSTEM_UID_MAX)
+                goto not_found;
+
+        if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
+                goto not_found;
+
+        if (getenv_bool("SYSTEMD_NSS_BYPASS_BUS") > 0) {
+
+                r = direct_lookup_uid(uid, &direct);
+                if (r == -ENOENT)
+                        goto not_found;
+                if (r < 0)
+                        goto fail;
+
+                translated = direct;
+
+        } else {
+                r = sd_bus_open_system(&bus);
+                if (r < 0)
+                        goto fail;
+
+                r = sd_bus_call_method(bus,
+                                       "org.freedesktop.systemd1",
+                                       "/org/freedesktop/systemd1",
+                                       "org.freedesktop.systemd1.Manager",
+                                       "LookupDynamicUserByUID",
+                                       &error,
+                                       &reply,
+                                       "u",
+                                       (uint32_t) uid);
+                if (r < 0) {
+                        if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
+                                goto not_found;
+
+                        goto fail;
+                }
+
+                r = sd_bus_message_read(reply, "s", &translated);
+                if (r < 0)
+                        goto fail;
+        }
+
+        l = strlen(translated) + 1;
+        if (buflen < l) {
+                *errnop = ENOMEM;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        memcpy(buffer, translated, l);
+
+        pwd->pw_name = buffer;
+        pwd->pw_uid = uid;
+        pwd->pw_gid = uid;
+        pwd->pw_gecos = (char*) "Dynamic User";
+        pwd->pw_passwd = (char*) "*"; /* locked */
+        pwd->pw_dir = (char*) "/";
+        pwd->pw_shell = (char*) "/sbin/nologin";
+
+        *errnop = 0;
+        return NSS_STATUS_SUCCESS;
+
+not_found:
+        *errnop = 0;
+        return NSS_STATUS_NOTFOUND;
+
+fail:
+        *errnop = -r;
+        return NSS_STATUS_UNAVAIL;
+}
+
+enum nss_status _nss_systemd_getgrnam_r(
+                const char *name,
+                struct group *gr,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        uint32_t translated;
+        size_t l;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        assert(name);
+        assert(gr);
+
+        if (!valid_user_group_name(name)) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        /* Synthesize records for root and nobody, in case they are missing form /etc/group */
+        if (streq(name, root_group.gr_name)) {
+                *gr = root_group;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+        if (streq(name, nobody_group.gr_name)) {
+                *gr = nobody_group;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+
+        if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
+                goto not_found;
+
+        if (getenv_bool("SYSTEMD_NSS_BYPASS_BUS") > 0) {
+
+                /* Access the dynamic GID allocation directly if we are called from dbus-daemon, see above. */
+                r = direct_lookup_name(name, (uid_t*) &translated);
+                if (r == -ENOENT)
+                        goto not_found;
+                if (r < 0)
+                        goto fail;
+        } else {
+
+                _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+                _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+
+                r = sd_bus_open_system(&bus);
+                if (r < 0)
+                        goto fail;
+
+                r = sd_bus_call_method(bus,
+                                       "org.freedesktop.systemd1",
+                                       "/org/freedesktop/systemd1",
+                                       "org.freedesktop.systemd1.Manager",
+                                       "LookupDynamicUserByName",
+                                       &error,
+                                       &reply,
+                                       "s",
+                                       name);
+                if (r < 0) {
+                        if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
+                                goto not_found;
+
+                        goto fail;
+                }
+
+                r = sd_bus_message_read(reply, "u", &translated);
+                if (r < 0)
+                        goto fail;
+        }
+
+        l = sizeof(char*) + strlen(name) + 1;
+        if (buflen < l) {
+                *errnop = ENOMEM;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        memzero(buffer, sizeof(char*));
+        strcpy(buffer + sizeof(char*), name);
+
+        gr->gr_name = buffer + sizeof(char*);
+        gr->gr_gid = (gid_t) translated;
+        gr->gr_passwd = (char*) "*"; /* locked */
+        gr->gr_mem = (char**) buffer;
+
+        *errnop = 0;
+        return NSS_STATUS_SUCCESS;
+
+not_found:
+        *errnop = 0;
+        return NSS_STATUS_NOTFOUND;
+
+fail:
+        *errnop = -r;
+        return NSS_STATUS_UNAVAIL;
+}
+
+enum nss_status _nss_systemd_getgrgid_r(
+                gid_t gid,
+                struct group *gr,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_free_ char *direct = NULL;
+        const char *translated;
+        size_t l;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        if (!gid_is_valid(gid)) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        /* Synthesize records for root and nobody, in case they are missing from /etc/group */
+        if (gid == root_group.gr_gid) {
+                *gr = root_group;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+        if (gid == nobody_group.gr_gid) {
+                *gr = nobody_group;
+                *errnop = 0;
+                return NSS_STATUS_SUCCESS;
+        }
+
+        if (gid <= SYSTEM_GID_MAX)
+                goto not_found;
+
+        if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
+                goto not_found;
+
+        if (getenv_bool("SYSTEMD_NSS_BYPASS_BUS") > 0) {
+
+                r = direct_lookup_uid(gid, &direct);
+                if (r == -ENOENT)
+                        goto not_found;
+                if (r < 0)
+                        goto fail;
+
+                translated = direct;
+        } else {
+                r = sd_bus_open_system(&bus);
+                if (r < 0)
+                        goto fail;
+
+                r = sd_bus_call_method(bus,
+                                       "org.freedesktop.systemd1",
+                                       "/org/freedesktop/systemd1",
+                                       "org.freedesktop.systemd1.Manager",
+                                       "LookupDynamicUserByUID",
+                                       &error,
+                                       &reply,
+                                       "u",
+                                       (uint32_t) gid);
+                if (r < 0) {
+                        if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
+                                goto not_found;
+
+                        goto fail;
+                }
+
+                r = sd_bus_message_read(reply, "s", &translated);
+                if (r < 0)
+                        goto fail;
+        }
+
+        l = sizeof(char*) + strlen(translated) + 1;
+        if (buflen < l) {
+                *errnop = ENOMEM;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        memzero(buffer, sizeof(char*));
+        strcpy(buffer + sizeof(char*), translated);
+
+        gr->gr_name = buffer + sizeof(char*);
+        gr->gr_gid = gid;
+        gr->gr_passwd = (char*) "*"; /* locked */
+        gr->gr_mem = (char**) buffer;
+
+        *errnop = 0;
+        return NSS_STATUS_SUCCESS;
+
+not_found:
+        *errnop = 0;
+        return NSS_STATUS_NOTFOUND;
+
+fail:
+        *errnop = -r;
+        return NSS_STATUS_UNAVAIL;
+}
diff --git a/src/nss-systemd/nss-systemd.sym b/src/nss-systemd/nss-systemd.sym
new file mode 100644
index 0000000000..955078788a
--- /dev/null
+++ b/src/nss-systemd/nss-systemd.sym
@@ -0,0 +1,17 @@
+/***
+  This file is part of systemd.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+***/
+
+{
+global:
+        _nss_systemd_getpwnam_r;
+        _nss_systemd_getpwuid_r;
+        _nss_systemd_getgrnam_r;
+        _nss_systemd_getgrgid_r;
+local: *;
+};
diff --git a/src/nss-systemd/nss-systemd.xml b/src/nss-systemd/nss-systemd.xml
new file mode 100644
index 0000000000..71aed4df83
--- /dev/null
+++ b/src/nss-systemd/nss-systemd.xml
@@ -0,0 +1,111 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2016 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="nss-systemd">
+
+  <refentryinfo>
+    <title>nss-systemd</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>Lennart</firstname>
+        <surname>Poettering</surname>
+        <email>lennart@poettering.net</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>nss-systemd</refentrytitle>
+    <manvolnum>8</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>nss-systemd</refname>
+    <refname>libnss_systemd.so.2</refname>
+    <refpurpose>Provide UNIX user and group name resolution for dynamic users and groups.</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>libnss_systemd.so.2</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><command>nss-systemd</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the
+    GNU C Library (<command>glibc</command>), providing UNIX user and group name resolution for dynamic users and
+    groups allocated through the <varname>DynamicUser=</varname> option in systemd unit files. See
+    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details on
+    this option.</para>
+
+    <para>This module also ensures that the root and nobody users and groups (i.e. the users/groups with the UIDs/GIDs
+    0 and 65534) remain resolvable at all times, even if they aren't listed in <filename>/etc/passwd</filename> or
+    <filename>/etc/group</filename>, or if these files are missing.</para>
+
+    <para>To activate the NSS module, add <literal>systemd</literal> to the lines starting with
+    <literal>passwd:</literal> and <literal>group:</literal> in <filename>/etc/nsswitch.conf</filename>.</para>
+
+    <para>It is recommended to place <literal>systemd</literal> after the <literal>files</literal> or
+    <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines so that
+    <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Example</title>
+
+    <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables
+    <command>nss-systemd</command> correctly:</para>
+
+    <programlisting>passwd:         compat mymachines <command>systemd</command>
+group:          compat mymachines <command>systemd</command>
+shadow:         compat
+
+hosts:          files mymachines resolve [!UNAVAIL=return] dns myhostname
+networks:       files
+
+protocols:      db files
+services:       db files
+ethers:         db files
+rpc:            db files
+
+netgroup:       nis</programlisting>
+
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>