/***************************************************************************
 *   Copyright (C) 06/2006 by Olaf Rempel                                  *
 *   razzor@kopf-tisch.de                                                  *
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <mntent.h>
#include <sys/vfs.h>
#include <string.h>

#include "plugins.h"

struct sammler_plugin plugin;

static char *ds_def[] = {
	"DS:block_total:GAUGE:%d:0:U",
	"DS:block_free:GAUGE:%d:0:U",
	NULL
};

static char ** get_ds(int ds_id)
{
	return ds_def;
}

static void probe(void)
{
	FILE *fp;
	struct mntent *mnt;
	struct statfs fs;
	char *slash, filename[64];
	int len;

	fp = setmntent("/etc/mtab", "r");
	if (fp == NULL) {
		log_print(LOG_WARN, "plugin mount");
		return;
	}

	while ((mnt = getmntent(fp)) != NULL) {
		if (!strcmp(mnt->mnt_fsname, "none"))
			continue;

		if (!strcmp(mnt->mnt_fsname, "proc"))
			continue;

		if (!strcmp(mnt->mnt_fsname, "sysfs"))
			continue;

		if (!strcmp(mnt->mnt_fsname, "udev"))
			continue;

		if (!strcmp(mnt->mnt_fsname, "devpts"))
			continue;

		if (!strcmp(mnt->mnt_type, "nfs"))
			continue;

		if (!strcmp(mnt->mnt_type, "tmpfs"))
			continue;

		if (statfs(mnt->mnt_dir, &fs) == -1) {
			log_print(LOG_WARN, "plugin mount: statfs(%s)", mnt->mnt_dir);
			continue;
		}

		if (fs.f_blocks == 0)
			continue;

		slash = mnt->mnt_fsname;
		while (slash && (slash = strchr(slash, '/'))) {
			slash = strchr(slash, '/');
			*slash++ = '_';
		}

		len = snprintf(filename, sizeof(filename), "mount%s.rrd", mnt->mnt_fsname);
		if (len < 0 || len >= sizeof(filename)) {
			log_print(LOG_WARN, "plugin mount: file name too long", mnt->mnt_fsname);
			continue;
		}

		probe_submit(&plugin, filename, 0, "%lu:%lu",
				fs.f_blocks * (fs.f_bsize /1024),
				fs.f_bfree * (fs.f_bsize /1024));
	}
	endmntent(fp);
}

struct sammler_plugin plugin = {
	.name		= "mount",
	.version	= 1,
	.probe		= &probe,
	.get_ds		= &get_ds,
};