initial version of a check_apt plugin... not editing configure/Makefile.am's

until i'm happier with it (better output, better ways to define warning
vs. critical thresholds... etc).


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1339 f882894a-f735-0410-b71e-b25c423dba1c

plugins/check_apt.c

@@ -0,0 +1,173 @@
+/******************************************************************************
+ * check_apt.c: check for available updates in apt package management systems
+ * original author: sean finney <seanius@seanius.net> 
+ *                  (with some common bits stolen from check_nagios.c)
+ ******************************************************************************
+
+ 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.
+
+ $Id$
+ 
+******************************************************************************/
+
+const char *progname = "check_apt";
+const char *revision = "$Revision$";
+const char *copyright = "2006";
+const char *email = "nagiosplug-devel@lists.sourceforge.net";
+
+#include "common.h"
+#include "runcmd.h"
+#include "utils.h"
+
+#define APTGET_UPGRADE "/usr/bin/apt-get -o 'Debug::NoLocking=true' -s -qq upgrade"
+#define APTGET_DISTUPGRADE "/usr/bin/apt-get -o 'Debug::NoLocking=true' -s -qq dist-upgrade"
+#define APTGET_UPDATE "/usr/bin/apt-get update"
+
+int process_arguments(int, char **);
+void print_help(void);
+void print_usage(void);
+
+int run_upgrade(int *pkgcount);
+
+static int verbose = 0;
+
+int main (int argc, char **argv) {
+	int result=STATE_UNKNOWN, packages_available=0;
+
+	if (process_arguments(argc, argv) == ERROR)
+		usage_va(_("Could not parse arguments"));
+
+	/* Set signal handling and alarm timeout */
+	if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
+		usage_va(_("Cannot catch SIGALRM"));
+	}
+
+	/* handle timeouts gracefully... */
+	alarm (timeout_interval);
+
+	/* apt-get upgrade */
+	result = run_upgrade(&packages_available);
+
+	if(packages_available > 0){
+		result = STATE_WARNING;
+		printf("APT WARNING: ");
+	} else {
+		result = STATE_OK;
+		printf("APT OK: ");
+	}
+	printf("%d packages available for upgrade\n", packages_available);
+
+	return result;
+}
+
+/* process command-line arguments */
+int process_arguments (int argc, char **argv) {
+	int c;
+
+	static struct option longopts[] = {
+		{"version", no_argument, 0, 'V'},
+		{"help", no_argument, 0, 'h'},
+		{"verbose", no_argument, 0, 'v'},
+		{"timeout", required_argument, 0, 't'},
+		{0, 0, 0, 0}
+	};
+
+	while(1) {
+		c = getopt_long(argc, argv, "hVvt", longopts, NULL);
+
+		if(c == -1 || c == EOF || c == 1) break;
+
+		switch(c) {
+		case 'h':									/* help */
+			print_help();
+			exit(STATE_OK);
+		case 'V':									/* version */
+			print_revision(progname, revision);
+			exit(STATE_OK);
+		case 'v':
+			verbose++;
+			break;
+		case 't':
+			timeout_interval=atoi(optarg);
+			break;
+		default:
+			/* print short usage statement if args not parsable */
+			usage_va(_("Unknown argument - %s"), optarg);
+		}
+	}
+
+	return OK;
+}
+
+
+/* informative help message */
+void print_help(void){
+	print_revision(progname, revision);
+	printf(_(COPYRIGHT), copyright, email);
+	printf(_("\
+This plugin checks for software updates on systems that use\n\
+package management systems based on the apt-get(8) command\n\
+found in Debian GNU/Linux\n\
+\n\n"));
+	print_usage();
+	printf(_(UT_HELP_VRSN));
+	printf(_("\
+ -t, --timeout=INTEGER\n\
+   Seconds to wait for plugin execution to complete\n\
+"));
+}
+
+/* simple usage heading */
+void print_usage(void){
+	printf ("Usage: %s [-u] [-t timeout]\n", progname);
+}
+
+/* run an apt-get upgrade */
+int run_upgrade(int *pkgcount){
+	int i=0, result=STATE_UNKNOWN, pc=0;
+	struct output chld_out, chld_err;
+
+	/* run the upgrade */
+	if((result = np_runcmd(APTGET_UPGRADE, &chld_out, &chld_err, 0)) != 0)
+		result = STATE_WARNING;
+
+	/* parse the output, which should only consist of lines like
+	 *
+	 * Inst package ....
+	 * Conf package ....
+	 *
+	 * so we'll filter based on "Inst"
+	 */
+	for(i = 0; i < chld_out.lines; i++) {
+		if(strncmp(chld_out.line[i], "Inst", 4)==0){
+			if(verbose){
+				printf("%s\n", chld_out.line[i]);
+			}
+			pc++;
+		}
+	}
+	*pkgcount=pc;
+
+	/* If we get anything on stderr, at least set warning */
+	if(chld_err.buflen){
+		fprintf(stderr, "warning, output detected on stderr\n");
+		for(i = 0; i < chld_err.lines; i++) {
+			printf("got this: %s\n", chld_err.line[i]);
+			result = max_state (result, STATE_WARNING);
+		}
+	}
+
+	return result;
+}