wrapper to invert return status

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@94 f882894a-f735-0410-b71e-b25c423dba1c

plugins/negate.c

@@ -0,0 +1,299 @@
+/******************************************************************************
+ *
+ * Program: Inverting plugin wrapper for Nagios
+ * License: GPL
+ *
+ * License Information:
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ *
+ *****************************************************************************/
+
+#define PROGNAME "negate"
+#define REVISION "$Revision$"
+#define COPYRIGHT "2002"
+#define AUTHOR "Karl DeBisschop"
+#define EMAIL "kdebisschop@users.sourceforge.net"
+#define SUMMARY "Negates the status of a plugin (returns OK for CRITICAL, and vice-versa).\n"
+
+#define OPTIONS "\
+\[-t timeout] <definition of wrapped plugin>"
+
+#define LONGOPTIONS "\
+  -t, --timeout=INTEGER\n\
+    Terminate test if timeout limit is exceeded (default: %d)\n\
+     [keep this less than the plugin timeout to retain CRITICAL status]\n"
+
+#define DESCRIPTION "\
+This plugin is a wrapper to take the output of another plugin and invert it.\n\
+If the wrapped plugin returns STATE_OK, the wrapper will return STATE_CRITICAL.\n\
+If the wrapped plugin returns STATE_CRITICAL, the wrapper will return STATE_OK.\n\
+Otherwise, the output state of the wrapped plugin is unchanged.\n"
+
+#define DEFAULT_TIMEOUT 9
+
+#include "common.h"
+#include "utils.h"
+#include "popen.h"
+
+char *command_line;
+
+static int process_arguments (int, char **);
+static int validate_arguments (void);
+static void print_usage (void);
+static void print_help (void);
+
+/******************************************************************************
+
+The (psuedo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
+tags in the comments. With in the tags, the XML is assembled sequentially.
+You can define entities in tags. You also have all the #defines available as
+entities.
+
+Please note that all tags must be lowercase to use the DocBook XML DTD.
+
+@@-<article>
+
+<sect1>
+<title>Quick Reference</title>
+<!-- The refentry forms a manpage -->
+<refentry>
+<refmeta>
+<manvolnum>5<manvolnum>
+</refmeta>
+<refnamdiv>
+<refname>&PROGNAME;</refname>
+<refpurpose>&SUMMARY;</refpurpose>
+</refnamdiv>
+</refentry>
+</sect1>
+
+<sect1>
+<title>FAQ</title>
+</sect1>
+
+<sect1>
+<title>Theory, Installation, and Operation</title>
+
+<sect2>
+<title>General Description</title>
+<para>
+&DESCRIPTION;
+</para>
+</sect2>
+
+<sect2>
+<title>Future Enhancements</title>
+<para>ToDo List</para>
+<itemizedlist>
+<listitem>Add option to do regex substitution in output text</listitem>
+</itemizedlist>
+</sect2>
+
+
+<sect2>
+<title>Functions</title>
+-@@
+******************************************************************************/
+
+int
+main (int argc, char **argv)
+{
+	int found = 0, result = STATE_UNKNOWN;
+	char input_buffer[MAX_INPUT_BUFFER];
+
+	if (process_arguments (argc, argv) == ERROR)
+		usage ("Could not parse arguments");
+
+	/* Set signal handling and alarm */
+	if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
+		printf ("Cannot catch SIGALRM");
+		return STATE_UNKNOWN;
+	}
+	alarm (timeout_interval);
+
+	child_process = spopen (command_line);
+	if (child_process == NULL) {
+		printf ("Could not open pipe: %s\n", command_line);
+		exit (STATE_UNKNOWN);
+	}
+
+	child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
+	if (child_stderr == NULL) {
+		printf ("Could not open stderr for %s\n", command_line);
+	}
+
+	while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
+		found++;
+		if (index (input_buffer, '\n')) {
+			input_buffer[strcspn (input_buffer, "\n")] = 0;
+			printf ("%s\n", input_buffer);
+		}
+		else {
+			printf ("%s\n", input_buffer);
+		}
+	}
+
+	if (!found) {
+		printf ("%s problem - No data recieved from host\nCMD: %s\n", argv[0],
+						command_line);
+		exit (STATE_UNKNOWN);
+	}
+
+	/* close the pipe */
+	result = spclose (child_process);
+
+	/* WARNING if output found on stderr */
+	if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
+		result = max_state (result, STATE_WARNING);
+
+	/* close stderr */
+	(void) fclose (child_stderr);
+
+	if (result == STATE_OK)
+		return STATE_CRITICAL;
+	else if (result == STATE_CRITICAL)
+		return STATE_OK;
+	else
+		return result;
+}
+
+
+
+
+void
+print_help (void)
+{
+	print_revision (PROGNAME, REVISION);
+	printf
+		("Copyright (c) %s %s <%s>\n\n%s\n",
+		 COPYRIGHT, AUTHOR, EMAIL, SUMMARY);
+	print_usage ();
+	printf
+		("\nOptions:\n" LONGOPTIONS "\n" DESCRIPTION "\n", 
+		 DEFAULT_TIMEOUT);
+	support ();
+}
+
+void
+print_usage (void)
+{
+	printf ("Usage:\n" " %s %s\n"
+#ifdef HAVE_GETOPT_H
+					" %s (-h | --help) for detailed help\n"
+					" %s (-V | --version) for version information\n",
+#else
+					" %s -h for detailed help\n"
+					" %s -V for version information\n",
+#endif
+					PROGNAME, OPTIONS, PROGNAME, PROGNAME);
+}
+
+
+
+/******************************************************************************
+@@-
+<sect3>
+<title>process_arguments</title>
+
+<para>This function parses the command line into the needed
+variables.</para>
+
+<para>Aside from the standard 'help' and 'version' options, there
+is a only a 'timeout' option.No validation is currently done.</para>
+
+</sect3>
+-@@
+******************************************************************************/
+
+/* process command-line arguments */
+int
+process_arguments (int argc, char **argv)
+{
+	int c;
+
+#ifdef HAVE_GETOPT_H
+	int option_index = 0;
+	static struct option long_options[] = {
+		{"help", no_argument, 0, 'h'},
+		{"version", no_argument, 0, 'V'},
+		{"timeout", required_argument, 0, 't'},
+		{0, 0, 0, 0}
+	};
+#endif
+
+	while (1) {
+#ifdef HAVE_GETOPT_H
+		c = getopt_long (argc, argv, "+?hVt:",
+		                 long_options, &option_index);
+#else
+		c = getopt (argc, argv, "+?hVt:");
+#endif
+		if (c == -1 || c == EOF)
+			break;
+
+		switch (c) {
+		case '?':     /* help */
+			usage2 ("Unknown argument", optarg);
+		case 'h':     /* help */
+			print_help ();
+			exit (STATE_OK);
+		case 'V':     /* version */
+			print_revision (PROGNAME, REVISION);
+			exit (STATE_OK);
+		case 't':     /* timeout period */
+			if (!is_integer (optarg))
+				usage2 ("Timeout Interval must be an integer", optarg);
+			timeout_interval = atoi (optarg);
+			break;
+		}
+	}
+
+	command_line = strscpy (command_line, argv[optind]);
+	for (c = optind+1; c <= argc; c++) {
+		command_line = ssprintf (command_line, "%s %s", command_line, argv[c]);
+	}
+
+	return validate_arguments ();
+}
+
+
+/******************************************************************************
+@@-
+<sect3>
+<title>validate_arguments</title>
+
+<para>No validation is currently done.</para>
+
+</sect3>
+-@@
+******************************************************************************/
+
+int
+validate_arguments ()
+{
+	return OK;
+}
+
+
+/******************************************************************************
+@@-
+</sect2> 
+</sect1>
+</article>
+-@@
+******************************************************************************/