/******************************************************************************
 *
 * CHECK_ROMFS.C
 *
 * Program: Linux plugin for Nagios
 * License: GPL
 * Copyright (c) 2009- Victor Ruiz (vruiz@adif.es)
 *
 * Description:
 *
 * This software checks the LSB of f_flag from struct statvfs to discover
 * Read_Only Mounted Filesystems.
 *
 * 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: check_romfs.c,v 0.9 2009/04/08 17:39:45 savirziur Exp $
 *
 *****************************************************************************/


#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/statvfs.h>

#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define MAX_PATH 1024

enum nagios_states { OK, WARNING, CRITICAL, UNKNOWN };

int main (int argc, char *argv[]) {

	struct statvfs buffer;
	char *output[argc - 1];
	int state = OK, i;
	char line[MAX_PATH];
	
	if ( argc < 2 ) {
		printf("\n	Usage: %s <path_1> [ path_2 ... ]\n\n\
			<path_n> is the pathname of any file or directory within the mounted file system\n\n\
			Device pathnames may yield false read-write mountings: e.g. CD-ROM's\n\n", argv[0]);
                return (UNKNOWN);
        }

	for ( i=1; i < argc; i++ ) {
	
		memset(line, '\0', sizeof(line));
	
		if ( -1 == statvfs(argv[i], &buffer) ) {
			state = MAX(state, WARNING);
			sprintf(line,"%s %s", argv[i], strerror(errno));
		} else {
			if ( buffer.f_flag & ST_RDONLY ) {
				state = MAX(state, CRITICAL);
				sprintf(line,"%s mounted READ_ONLY", argv[i]);
			} else {
				sprintf(line,"%s mounted READ_WRITE", argv[i]);
			}	
		}
		output[i] = (char *) malloc(sizeof(line));
		strcpy(output[i], line);
	}
	
	switch(state){
		case OK: 	printf("OK:"); break;
		case WARNING:	printf("WARNING:");break;
		case CRITICAL:	printf("CRITICAL:");break;
	}
	
	for ( i=1; i < argc; i++ ) {
		printf(" -- %s ", output[i]);
		free (output[i]);
	}
	putchar('\n');
	return state;

}