sammler/plugins/mount.c

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/***************************************************************************
* 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>
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#include <string.h>
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#include <mntent.h>
#include <sys/vfs.h>
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#include "logging.h"
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#include "plugins.h"
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#include "probe.h"
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#define MAXFSNAME 16
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struct sammler_plugin plugin;
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static const char *ds_def = {
"DS:block_total:GAUGE:15:0:U "
"DS:block_free:GAUGE:15:0:U "
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};
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static const char * get_ds(int ds_id)
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{
return ds_def;
}
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static char * get_valid_fs(int *xcnt)
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{
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FILE *fp = fopen("/proc/filesystems", "r");
if (fp == NULL)
return NULL;
int cnt = 0;
char buffer[64];
while (fgets(buffer, sizeof(buffer), fp) != NULL) {
if (!strncmp(buffer, "nodev", 5))
continue;
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cnt++;
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}
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char *valid_arr = malloc(cnt * MAXFSNAME);
if (valid_arr == NULL)
return NULL;
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rewind(fp);
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int i = 0;
while (fgets(buffer, sizeof(buffer), fp) != NULL) {
if (!strncmp(buffer, "nodev", 5))
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continue;
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char *end = memccpy(valid_arr + (i++ * MAXFSNAME), buffer +1, '\n', MAXFSNAME);
*(end -1) = '\0';
}
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fclose(fp);
*xcnt = cnt;
return valid_arr;
}
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static int probe(void)
{
FILE *fp = setmntent("/etc/mtab", "r");
if (fp == NULL) {
log_print(LOG_WARN, "plugin mount");
return -1;
}
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int cnt;
char *valid_arr = get_valid_fs(&cnt);
if (valid_arr == NULL) {
log_print(LOG_WARN, "plugin mount");
endmntent(fp);
return -1;
}
struct mntent *mnt;
while ((mnt = getmntent(fp)) != NULL) {
int i, valid = 0;
for (i = 0; i < cnt; i++)
if (strncmp(mnt->mnt_type, valid_arr + (i * MAXFSNAME), MAXFSNAME) == 0)
valid = 1;
if (valid == 0)
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continue;
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struct statfs fs;
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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;
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char *slash = mnt->mnt_fsname;
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while (slash && (slash = strchr(slash, '/'))) {
slash = strchr(slash, '/');
*slash++ = '_';
}
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char filename[64];
int len = snprintf(filename, sizeof(filename), "mount%s.rrd", mnt->mnt_fsname);
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if (len < 0 || len >= sizeof(filename)) {
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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));
}
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free(valid_arr);
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endmntent(fp);
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return 0;
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}
struct sammler_plugin plugin = {
.name = "mount",
.interval = 10,
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.probe = &probe,
.get_ds = &get_ds,
};