1 files changed, 277 insertions, 0 deletions
diff --git a/plugins/check_users.c b/plugins/check_users.c
new file mode 100644
index 0000000..2a9ee98
--- /dev/null
+++ b/plugins/check_users.c
@@ -0,0 +1,277 @@
+/*****************************************************************************
+*
+* 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";
+const char *copyright = "2000-2007";
+const char *email = "devel@monitoring-plugins.org";
+
+#include "common.h"
+#include "utils.h"
+
+#if HAVE_WTSAPI32_H
+# include <windows.h>
+# include <wtsapi32.h>
+# undef ERROR
+# define ERROR -1
+#elif HAVE_UTMPX_H
+# include <utmpx.h>
+#else
+# 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 **);
+void print_help (void);
+void print_usage (void);
+
+char *warning_range = NULL;
+char *critical_range = NULL;
+thresholds *thlds = NULL;
+
+int
+main (int argc, char **argv)
+{
+	int users = -1;
+	int result = STATE_UNKNOWN;
+#if HAVE_WTSAPI32_H
+	WTS_SESSION_INFO *wtsinfo;
+	DWORD wtscount;
+	DWORD index;
+#elif HAVE_UTMPX_H
+	struct utmpx *putmpx;
+#else
+	char input_buffer[MAX_INPUT_BUFFER];
+#endif
+
+	setlocale (LC_ALL, "");
+	bindtextdomain (PACKAGE, LOCALEDIR);
+	textdomain (PACKAGE);
+
+	/* Parse extra opts if any */
+	argv = np_extra_opts (&argc, argv, progname);
+
+	if (process_arguments (argc, argv) == ERROR)
+		usage4 (_("Could not parse arguments"));
+
+	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)) {
+		printf(_("Could not enumerate RD sessions: %d\n"), GetLastError());
+		return STATE_UNKNOWN;
+	}
+
+	for (index = 0; index < wtscount; index++) {
+		LPTSTR username;
+		DWORD size;
+		int len;
+
+		if (!WTSQuerySessionInformation(WTS_CURRENT_SERVER_HANDLE,
+		  wtsinfo[index].SessionId, WTSUserName, &username, &size))
+			continue;
+
+		len = lstrlen(username);
+
+		WTSFreeMemory(username);
+
+		if (len == 0)
+			continue;
+
+		if (wtsinfo[index].State == WTSActive ||
+		  wtsinfo[index].State == WTSDisconnected)
+			users++;
+	}
+
+	WTSFreeMemory(wtsinfo);
+#elif HAVE_UTMPX_H
+	/* get currently logged users from utmpx */
+	setutxent ();
+
+	while ((putmpx = getutxent ()) != NULL)
+		if (putmpx->ut_type == USER_PROCESS)
+			users++;
+
+	endutxent ();
+#else
+	/* run the command */
+	child_process = spopen (WHO_COMMAND);
+	if (child_process == NULL) {
+		printf (_("Could not open pipe: %s\n"), WHO_COMMAND);
+		return STATE_UNKNOWN;
+	}
+
+	child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
+	if (child_stderr == NULL)
+		printf (_("Could not open stderr for %s\n"), WHO_COMMAND);
+
+	while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
+		/* increment 'users' on all lines except total user count */
+		if (input_buffer[0] != '#') {
+			users++;
+			continue;
+		}
+
+		/* get total logged in users */
+		if (sscanf (input_buffer, _("# users=%d"), &users) == 1)
+			break;
+	}
+
+	/* check STDERR */
+	if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
+		result = possibly_set (result, STATE_UNKNOWN);
+	(void) fclose (child_stderr);
+
+	/* close the pipe */
+	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);
+
+	if (result == STATE_UNKNOWN)
+		printf ("%s\n", _("Unable to read output"));
+	else {
+		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));
+	}
+
+	return result;
+}
+
+/* process command-line arguments */
+int
+process_arguments (int argc, char **argv)
+{
+	int c;
+	int option = 0;
+	static struct option longopts[] = {
+		{"critical", required_argument, 0, 'c'},
+		{"warning", required_argument, 0, 'w'},
+		{"version", no_argument, 0, 'V'},
+		{"help", no_argument, 0, 'h'},
+		{0, 0, 0, 0}
+	};
+
+	if (argc < 2)
+		usage ("\n");
+
+	while (1) {
+		c = getopt_long (argc, argv, "+hVvc:w:", longopts, &option);
+
+		if (c == -1 || c == EOF || c == 1)
+			break;
+
+		switch (c) {
+		case '?':									/* print short usage statement if args not parsable */
+			usage5 ();
+		case 'h':									/* help */
+			print_help ();
+			exit (STATE_UNKNOWN);
+		case 'V':									/* version */
+			print_revision (progname, NP_VERSION);
+			exit (STATE_UNKNOWN);
+		case 'c':									/* critical */
+			critical_range = optarg;
+			break;
+		case 'w':									/* warning */
+			warning_range = optarg;
+			break;
+		}
+	}
+
+	c = optind;
+	if (warning_range == NULL && argc > c)
+		warning_range = argv[c++];
+	if (critical_range == NULL && argc > c)
+		critical_range = argv[c++];
+
+	/* this will abort in case of invalid ranges */
+	set_thresholds (&thlds, warning_range, critical_range);
+
+	if (thlds->warning->end < 0)
+		usage4 (_("Warning threshold must be a positive integer"));
+	if (thlds->critical->end < 0)
+		usage4 (_("Critical threshold must be a positive integer"));
+
+	return OK;
+}
+
+void
+print_help (void)
+{
+	print_revision (progname, NP_VERSION);
+
+	printf ("Copyright (c) 1999 Ethan Galstad\n");
+	printf (COPYRIGHT, copyright, email);
+
+	printf ("%s\n", _("This plugin checks the number of users currently logged in on the local"));
+	printf ("%s\n", _("system and generates an error if the number exceeds the thresholds specified."));
+
+	printf ("\n\n");
+
+	print_usage ();
+
+	printf (UT_HELP_VRSN);
+	printf (UT_EXTRA_OPTS);
+
+	printf (" %s\n", "-w, --warning=INTEGER");
+	printf ("    %s\n", _("Set WARNING status if more than INTEGER users are logged in"));
+	printf (" %s\n", "-c, --critical=INTEGER");
+	printf ("    %s\n", _("Set CRITICAL status if more than INTEGER users are logged in"));
+
+	printf (UT_SUPPORT);
+}
+
+void
+print_usage (void)
+{
+	printf ("%s\n", _("Usage:"));
+	printf ("%s -w <users> -c <users>\n", progname);
+}