/*
   check_meminfo - quick&dirty plugin for nagios
   Copyright (C) 2006 Thomas A.F. Eckhardt <tafe unkelhaeusser net>

   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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include <stdio.h>

#define VERSION "0.1"
#define PROCFS_MEMINFO "/proc/meminfo"
#define BUFFER_LEN 127

int main () {
	FILE *fd;
	char buffer[BUFFER_LEN];
	int memtotal = 0, memfree = 0, membuffer = 0, memcached = 0, swaptotal = 0, swapfree = 0;
	int memused = 0, swapused = 0;


	if ((fd = fopen (PROCFS_MEMINFO, "r")) == NULL) { perror("fopen() failed"); exit(1); }

	while ( fgets(buffer, BUFFER_LEN, fd) != NULL) {

		/* kernel <2.6 prints summarys we dont want to use */ 
		if ( buffer[(strlen(buffer) - 2)] != 'B') continue;

		if (sscanf (buffer, "MemTotal:%dkB", &memtotal)) {
			//printf("memtotal: %d\n", memtotal);
		} else if (sscanf (buffer, "MemFree:%dkB", &memfree)) {
			//printf("memfree: %d\n", memfree);
		} else if (sscanf (buffer, "Buffers:%dkB", &membuffer)) {
			//printf("membuffer: %d\n", membuffer);
		} else if (sscanf (buffer, "Cached:%dkB", &memcached)) {
			//printf("memcached: %d\n", memcached);
		} else if (sscanf (buffer, "SwapTotal:%dkB", &swaptotal)) {
			//printf("swaptotal: %d\n", swaptotal);
		} else if (sscanf (buffer, "SwapFree:%dkB", &swapfree)) {
			//printf("swapfree: %d\n", swapfree);
		}

	}

	fclose (fd);

	if (memtotal == 0) { fprintf(stderr, "No memory? quitting..\n"); exit(1); }

	memused = memtotal - memfree - membuffer - memcached;
	swapused = swaptotal - swapfree;

	printf("OK - Free: %d|memtotal=%d;0;0;0; memused=%d;0;0;0; membuffer=%d;0;0;0; "
		"memcached=%d;0;0;0; swapused=%d;0;0;0; swaptotal=%d;0;0;0;\n",
		(memfree + (membuffer+memcached)), memtotal, memused, membuffer, memcached, swapused, swaptotal);

	return(0);
}