6 files changed, 94 insertions, 62 deletions

diff --git a/configure.ac b/configure.ac
index 069cc625..a294b00f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -328,6 +328,25 @@ AS_IF([test "x$with_ldap" != "xno"], [
   LIBS="$_SAVEDLIBS"
 ])
 
+
+AC_ARG_WITH([systemd], [AS_HELP_STRING([--without-systemd], [Skips systemd support])])
+
+dnl Check for libsystemd
+AS_IF([test "x$with_systemd" != "xno"], [
+  _SAVEDLIBS="$LIBS"
+  AC_CHECK_LIB(systemd,sd_get_sessions,,,-lsystemd)
+  if test "$ac_cv_lib_systemd_sd_get_sessions" = "yes"; then
+    SYSTEMDLIBS="-lsystemd"
+    SYSTEMDINCLUDE=""
+    AC_SUBST(SYSTEMDLIBS)
+    AC_SUBST(SYSTEMDINCLUDE)
+  else
+    AC_MSG_WARN([Skipping systemd support])
+  fi
+  LIBS="$_SAVEDLIBS"
+])
+
+
 dnl Check for headers used by check_ide_smart
 case $host in
   *linux*)
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index ab59eb73..49086b7a 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -112,7 +112,7 @@ check_tcp_LDADD = $(SSLOBJS)
 check_time_LDADD = $(NETLIBS)
 check_ntp_time_LDADD = $(NETLIBS) $(MATHLIBS)
 check_ups_LDADD = $(NETLIBS)
-check_users_LDADD = $(BASEOBJS) $(WTSAPI32LIBS)
+check_users_LDADD = $(BASEOBJS) $(WTSAPI32LIBS) $(SYSTEMDLIBS)
 check_by_ssh_LDADD = $(NETLIBS)
 check_ide_smart_LDADD = $(BASEOBJS)
 negate_LDADD = $(BASEOBJS)
diff --git a/plugins/check_users.c b/plugins/check_users.c
index f6f4b362..2a9ee986 100644
--- a/plugins/check_users.c
+++ b/plugins/check_users.c
@@ -1,33 +1,33 @@
 /*****************************************************************************
-* 
+*
 * Monitoring check_users plugin
-* 
+*
 * License: GPL
 * Copyright (c) 2000-2012 Monitoring Plugins Development Team
-* 
+*
 * Description:
-* 
+*
 * This file contains the check_users plugin
-* 
+*
 * This plugin checks the number of users currently logged in on the local
 * system and generates an error if the number exceeds the thresholds
 * specified.
-* 
-* 
+*
+*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
-* 
+*
 * This program 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 General Public License for more details.
-* 
+*
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-* 
-* 
+*
+*
 *****************************************************************************/
 
 const char *progname = "check_users";
@@ -48,6 +48,11 @@ const char *email = "devel@monitoring-plugins.org";
 # include "popen.h"
 #endif
 
+#ifdef HAVE_LIBSYSTEMD
+#include <systemd/sd-daemon.h>
+#include <systemd/sd-login.h>
+#endif
+
 #define possibly_set(a,b) ((a) == 0 ? (b) : 0)
 
 int process_arguments (int, char **);
@@ -85,6 +90,11 @@ main (int argc, char **argv)
 
         users = 0;
 
+#ifdef HAVE_LIBSYSTEMD
+        if (sd_booted () > 0)
+                users = sd_get_sessions (NULL);
+        else {
+#endif
 #if HAVE_WTSAPI32_H
         if (!WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE,
           0, 1, &wtsinfo, &wtscount)) {
@@ -156,6 +166,9 @@ main (int argc, char **argv)
         if (spclose (child_process))
                 result = possibly_set (result, STATE_UNKNOWN);
 #endif
+#ifdef HAVE_LIBSYSTEMD
+        }
+#endif
 
         /* check the user count against warning and critical thresholds */
         result = get_status((double)users, thlds);
@@ -163,7 +176,7 @@ main (int argc, char **argv)
         if (result == STATE_UNKNOWN)
                 printf ("%s\n", _("Unable to read output"));
         else {
-                printf (_("USERS %s - %d users currently logged in |%s\n"), 
+                printf (_("USERS %s - %d users currently logged in |%s\n"),
                                 state_text(result), users,
                                 sperfdata_int("users", users, "", warning_range,
                                                         critical_range, TRUE, 0, FALSE, 0));
diff --git a/po/de.po b/po/de.po
index 9aff4bed..c343455a 100644
--- a/po/de.po
+++ b/po/de.po
@@ -9,7 +9,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: nagiosplug\n"
 "Report-Msgid-Bugs-To: devel@monitoring-plugins.org\n"
-"POT-Creation-Date: 2023-08-28 11:16+0200\n"
+"POT-Creation-Date: 2023-08-28 14:50+0200\n"
 "PO-Revision-Date: 2004-12-23 17:46+0100\n"
 "Last-Translator:  <>\n"
 "Language-Team: English <en@li.org>\n"
@@ -31,7 +31,7 @@ msgstr ""
 #: plugins/check_radius.c:176 plugins/check_real.c:80 plugins/check_smtp.c:146
 #: plugins/check_snmp.c:250 plugins/check_ssh.c:74 plugins/check_swap.c:115
 #: plugins/check_tcp.c:222 plugins/check_time.c:78 plugins/check_ups.c:122
-#: plugins/check_users.c:84 plugins/negate.c:210 plugins-root/check_dhcp.c:270
+#: plugins/check_users.c:89 plugins/negate.c:210 plugins-root/check_dhcp.c:270
 msgid "Could not parse arguments"
 msgstr "Argumente konnten nicht ausgewertet werden"
 
@@ -255,7 +255,7 @@ msgstr ""
 #: plugins/check_radius.c:400 plugins/check_real.c:452 plugins/check_smtp.c:891
 #: plugins/check_snmp.c:1368 plugins/check_ssh.c:325 plugins/check_swap.c:607
 #: plugins/check_tcp.c:710 plugins/check_time.c:371 plugins/check_ups.c:663
-#: plugins/check_users.c:262 plugins/check_ide_smart.c:606 plugins/negate.c:273
+#: plugins/check_users.c:275 plugins/check_ide_smart.c:606 plugins/negate.c:273
 #: plugins/urlize.c:196 plugins-root/check_dhcp.c:1390
 #: plugins-root/check_icmp.c:1633
 msgid "Usage:"
@@ -892,13 +892,13 @@ msgid "of the <state> argument with optional text"
 msgstr ""
 
 #: plugins/check_fping.c:127 plugins/check_hpjd.c:134 plugins/check_ping.c:444
-#: plugins/check_swap.c:193 plugins/check_users.c:130 plugins/urlize.c:109
+#: plugins/check_swap.c:193 plugins/check_users.c:140 plugins/urlize.c:109
 #, c-format
 msgid "Could not open pipe: %s\n"
 msgstr "Pipe: %s konnte nicht geöffnet werden\n"
 
 #: plugins/check_fping.c:133 plugins/check_hpjd.c:140 plugins/check_load.c:159
-#: plugins/check_swap.c:199 plugins/check_users.c:136 plugins/urlize.c:115
+#: plugins/check_swap.c:199 plugins/check_users.c:146 plugins/urlize.c:115
 #, c-format
 msgid "Could not open stderr for %s\n"
 msgstr "Konnte stderr nicht öffnen für: %s\n"
@@ -3688,12 +3688,12 @@ msgid " %s - database %s (%f sec.)|%s\n"
 msgstr ""
 
 #: plugins/check_pgsql.c:320 plugins/check_time.c:277 plugins/check_time.c:289
-#: plugins/check_users.c:228
+#: plugins/check_users.c:241
 msgid "Critical threshold must be a positive integer"
 msgstr "Critical threshold muss ein positiver Integer sein"
 
 #: plugins/check_pgsql.c:326 plugins/check_time.c:258 plugins/check_time.c:282
-#: plugins/check_users.c:226
+#: plugins/check_users.c:239
 msgid "Warning threshold must be a positive integer"
 msgstr "Warning threshold muss ein positiver Integer sein"
 
@@ -5672,26 +5672,26 @@ msgstr ""
 msgid "http://www.networkupstools.org"
 msgstr ""
 
-#: plugins/check_users.c:91
+#: plugins/check_users.c:101
 #, fuzzy, c-format
 msgid "Could not enumerate RD sessions: %d\n"
 msgstr "Konnte·url·nicht·zuweisen\n"
 
-#: plugins/check_users.c:146
+#: plugins/check_users.c:156
 #, c-format
 msgid "# users=%d"
 msgstr ""
 
-#: plugins/check_users.c:164
+#: plugins/check_users.c:177
 msgid "Unable to read output"
 msgstr ""
 
-#: plugins/check_users.c:166
+#: plugins/check_users.c:179
 #, c-format
 msgid "USERS %s - %d users currently logged in |%s\n"
 msgstr ""
 
-#: plugins/check_users.c:241
+#: plugins/check_users.c:254
 #, fuzzy
 msgid "This plugin checks the number of users currently logged in on the local"
 msgstr ""
@@ -5700,16 +5700,16 @@ msgstr ""
 "unterschritten wird.\n"
 "\n"
 
-#: plugins/check_users.c:242
+#: plugins/check_users.c:255
 msgid ""
 "system and generates an error if the number exceeds the thresholds specified."
 msgstr ""
 
-#: plugins/check_users.c:252
+#: plugins/check_users.c:265
 msgid "Set WARNING status if more than INTEGER users are logged in"
 msgstr ""
 
-#: plugins/check_users.c:254
+#: plugins/check_users.c:267
 msgid "Set CRITICAL status if more than INTEGER users are logged in"
 msgstr ""
 
diff --git a/po/fr.po b/po/fr.po
index b05a23fb..1244e778 100644
--- a/po/fr.po
+++ b/po/fr.po
@@ -10,7 +10,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: fr\n"
 "Report-Msgid-Bugs-To: devel@monitoring-plugins.org\n"
-"POT-Creation-Date: 2023-08-28 11:16+0200\n"
+"POT-Creation-Date: 2023-08-28 14:50+0200\n"
 "PO-Revision-Date: 2010-04-21 23:38-0400\n"
 "Last-Translator: Thomas Guyot-Sionnest <dermoth@aei.ca>\n"
 "Language-Team: Nagios Plugin Development Mailing List <nagiosplug-"
@@ -34,7 +34,7 @@ msgstr ""
 #: plugins/check_radius.c:176 plugins/check_real.c:80 plugins/check_smtp.c:146
 #: plugins/check_snmp.c:250 plugins/check_ssh.c:74 plugins/check_swap.c:115
 #: plugins/check_tcp.c:222 plugins/check_time.c:78 plugins/check_ups.c:122
-#: plugins/check_users.c:84 plugins/negate.c:210 plugins-root/check_dhcp.c:270
+#: plugins/check_users.c:89 plugins/negate.c:210 plugins-root/check_dhcp.c:270
 msgid "Could not parse arguments"
 msgstr "Impossible de décomposer les arguments"
 
@@ -261,7 +261,7 @@ msgstr "Exemples:"
 #: plugins/check_radius.c:400 plugins/check_real.c:452 plugins/check_smtp.c:891
 #: plugins/check_snmp.c:1368 plugins/check_ssh.c:325 plugins/check_swap.c:607
 #: plugins/check_tcp.c:710 plugins/check_time.c:371 plugins/check_ups.c:663
-#: plugins/check_users.c:262 plugins/check_ide_smart.c:606 plugins/negate.c:273
+#: plugins/check_users.c:275 plugins/check_ide_smart.c:606 plugins/negate.c:273
 #: plugins/urlize.c:196 plugins-root/check_dhcp.c:1390
 #: plugins-root/check_icmp.c:1633
 msgid "Usage:"
@@ -929,13 +929,13 @@ msgid "of the <state> argument with optional text"
 msgstr "du paramètre <state> avec un texte optionnel"
 
 #: plugins/check_fping.c:127 plugins/check_hpjd.c:134 plugins/check_ping.c:444
-#: plugins/check_swap.c:193 plugins/check_users.c:130 plugins/urlize.c:109
+#: plugins/check_swap.c:193 plugins/check_users.c:140 plugins/urlize.c:109
 #, c-format
 msgid "Could not open pipe: %s\n"
 msgstr "Impossible d'ouvrir le pipe: %s\n"
 
 #: plugins/check_fping.c:133 plugins/check_hpjd.c:140 plugins/check_load.c:159
-#: plugins/check_swap.c:199 plugins/check_users.c:136 plugins/urlize.c:115
+#: plugins/check_swap.c:199 plugins/check_users.c:146 plugins/urlize.c:115
 #, c-format
 msgid "Could not open stderr for %s\n"
 msgstr "Impossible d'ouvrir la sortie d'erreur standard pour %s\n"
@@ -1495,8 +1495,8 @@ msgstr ""
 #, fuzzy, c-format
 msgid "HTTP CRITICAL - redirection creates an infinite loop - %s://%s:%d%s%s\n"
 msgstr ""
-"HTTP AVERTISSEMENT - la redirection crée une boucle infinie - %s://%s:"
-"%d%s%s\n"
+"HTTP AVERTISSEMENT - la redirection crée une boucle infinie - %s://%s:%d%s"
+"%s\n"
 
 #: plugins/check_http.c:1630
 #, c-format
@@ -3084,8 +3084,8 @@ msgstr ""
 #: plugins/check_ntp_peer.c:716
 msgid "Critical threshold for number of usable time sources (\"truechimers\")"
 msgstr ""
-"Seuil critique pour le nombre de sources de temps utilisable "
-"(\"truechimers\")"
+"Seuil critique pour le nombre de sources de temps utilisable (\"truechimers"
+"\")"
 
 #: plugins/check_ntp_peer.c:721
 msgid "This plugin checks an NTP server independent of any commandline"
@@ -3751,12 +3751,12 @@ msgid " %s - database %s (%f sec.)|%s\n"
 msgstr " %s - base de données %s (%d sec.)|%s\n"
 
 #: plugins/check_pgsql.c:320 plugins/check_time.c:277 plugins/check_time.c:289
-#: plugins/check_users.c:228
+#: plugins/check_users.c:241
 msgid "Critical threshold must be a positive integer"
 msgstr "Le seuil critique doit être un entier positif"
 
 #: plugins/check_pgsql.c:326 plugins/check_time.c:258 plugins/check_time.c:282
-#: plugins/check_users.c:226
+#: plugins/check_users.c:239
 msgid "Warning threshold must be a positive integer"
 msgstr "Le seuil d'avertissement doit être un entier positif"
 
@@ -5778,43 +5778,43 @@ msgstr ""
 msgid "http://www.networkupstools.org"
 msgstr ""
 
-#: plugins/check_users.c:91
+#: plugins/check_users.c:101
 #, fuzzy, c-format
 msgid "Could not enumerate RD sessions: %d\n"
 msgstr "Impossible d'utiliser le protocole version %d\n"
 
-#: plugins/check_users.c:146
+#: plugins/check_users.c:156
 #, c-format
 msgid "# users=%d"
 msgstr "# utilisateurs=%d"
 
-#: plugins/check_users.c:164
+#: plugins/check_users.c:177
 msgid "Unable to read output"
 msgstr "Impossible de lire les données en entrée"
 
-#: plugins/check_users.c:166
+#: plugins/check_users.c:179
 #, c-format
 msgid "USERS %s - %d users currently logged in |%s\n"
 msgstr "UTILISATEURS %s - %d utilisateurs actuellement connectés sur |%s\n"
 
-#: plugins/check_users.c:241
+#: plugins/check_users.c:254
 msgid "This plugin checks the number of users currently logged in on the local"
 msgstr ""
 "Ce plugin vérifie le nombre d'utilisateurs actuellement connecté sur le "
 "système local"
 
-#: plugins/check_users.c:242
+#: plugins/check_users.c:255
 msgid ""
 "system and generates an error if the number exceeds the thresholds specified."
 msgstr "et génère une erreur si le nombre excède le seuil spécifié."
 
-#: plugins/check_users.c:252
+#: plugins/check_users.c:265
 msgid "Set WARNING status if more than INTEGER users are logged in"
 msgstr ""
 "Sortir avec un résultat AVERTISSEMENT si plus de INTEGER utilisateurs sont "
 "connectés"
 
-#: plugins/check_users.c:254
+#: plugins/check_users.c:267
 msgid "Set CRITICAL status if more than INTEGER users are logged in"
 msgstr ""
 "Sortir avec un résultat CRITIQUE si plus de INTEGER utilisateurs sont "
diff --git a/po/monitoring-plugins.pot b/po/monitoring-plugins.pot
index 03788f15..df2ad296 100644
--- a/po/monitoring-plugins.pot
+++ b/po/monitoring-plugins.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: devel@monitoring-plugins.org\n"
-"POT-Creation-Date: 2023-08-28 11:16+0200\n"
+"POT-Creation-Date: 2023-08-28 14:50+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -30,7 +30,7 @@ msgstr ""
 #: plugins/check_radius.c:176 plugins/check_real.c:80 plugins/check_smtp.c:146
 #: plugins/check_snmp.c:250 plugins/check_ssh.c:74 plugins/check_swap.c:115
 #: plugins/check_tcp.c:222 plugins/check_time.c:78 plugins/check_ups.c:122
-#: plugins/check_users.c:84 plugins/negate.c:210 plugins-root/check_dhcp.c:270
+#: plugins/check_users.c:89 plugins/negate.c:210 plugins-root/check_dhcp.c:270
 msgid "Could not parse arguments"
 msgstr ""
 
@@ -246,7 +246,7 @@ msgstr ""
 #: plugins/check_radius.c:400 plugins/check_real.c:452 plugins/check_smtp.c:891
 #: plugins/check_snmp.c:1368 plugins/check_ssh.c:325 plugins/check_swap.c:607
 #: plugins/check_tcp.c:710 plugins/check_time.c:371 plugins/check_ups.c:663
-#: plugins/check_users.c:262 plugins/check_ide_smart.c:606 plugins/negate.c:273
+#: plugins/check_users.c:275 plugins/check_ide_smart.c:606 plugins/negate.c:273
 #: plugins/urlize.c:196 plugins-root/check_dhcp.c:1390
 #: plugins-root/check_icmp.c:1633
 msgid "Usage:"
@@ -870,13 +870,13 @@ msgid "of the <state> argument with optional text"
 msgstr ""
 
 #: plugins/check_fping.c:127 plugins/check_hpjd.c:134 plugins/check_ping.c:444
-#: plugins/check_swap.c:193 plugins/check_users.c:130 plugins/urlize.c:109
+#: plugins/check_swap.c:193 plugins/check_users.c:140 plugins/urlize.c:109
 #, c-format
 msgid "Could not open pipe: %s\n"
 msgstr ""
 
 #: plugins/check_fping.c:133 plugins/check_hpjd.c:140 plugins/check_load.c:159
-#: plugins/check_swap.c:199 plugins/check_users.c:136 plugins/urlize.c:115
+#: plugins/check_swap.c:199 plugins/check_users.c:146 plugins/urlize.c:115
 #, c-format
 msgid "Could not open stderr for %s\n"
 msgstr ""
@@ -3592,12 +3592,12 @@ msgid " %s - database %s (%f sec.)|%s\n"
 msgstr ""
 
 #: plugins/check_pgsql.c:320 plugins/check_time.c:277 plugins/check_time.c:289
-#: plugins/check_users.c:228
+#: plugins/check_users.c:241
 msgid "Critical threshold must be a positive integer"
 msgstr ""
 
 #: plugins/check_pgsql.c:326 plugins/check_time.c:258 plugins/check_time.c:282
-#: plugins/check_users.c:226
+#: plugins/check_users.c:239
 msgid "Warning threshold must be a positive integer"
 msgstr ""
 
@@ -5517,39 +5517,39 @@ msgstr ""
 msgid "http://www.networkupstools.org"
 msgstr ""
 
-#: plugins/check_users.c:91
+#: plugins/check_users.c:101
 #, c-format
 msgid "Could not enumerate RD sessions: %d\n"
 msgstr ""
 
-#: plugins/check_users.c:146
+#: plugins/check_users.c:156
 #, c-format
 msgid "# users=%d"
 msgstr ""
 
-#: plugins/check_users.c:164
+#: plugins/check_users.c:177
 msgid "Unable to read output"
 msgstr ""
 
-#: plugins/check_users.c:166
+#: plugins/check_users.c:179
 #, c-format
 msgid "USERS %s - %d users currently logged in |%s\n"
 msgstr ""
 
-#: plugins/check_users.c:241
+#: plugins/check_users.c:254
 msgid "This plugin checks the number of users currently logged in on the local"
 msgstr ""
 
-#: plugins/check_users.c:242
+#: plugins/check_users.c:255
 msgid ""
 "system and generates an error if the number exceeds the thresholds specified."
 msgstr ""
 
-#: plugins/check_users.c:252
+#: plugins/check_users.c:265
 msgid "Set WARNING status if more than INTEGER users are logged in"
 msgstr ""
 
-#: plugins/check_users.c:254
+#: plugins/check_users.c:267
 msgid "Set CRITICAL status if more than INTEGER users are logged in"
 msgstr ""