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monitoring-plugins/plugins/check_disk.c
Ton Voon 0f342875df Fixed bug with malloc of wrong size 
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1358 f882894a-f735-0410-b71e-b25c423dba1c
2006-03-27 08:19:01 +00:00

755 lines
24 KiB
C
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/******************************************************************************
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_disk";
const char *program_name = "check_disk"; /* Required for coreutils libs */
const char *revision = "$Revision$";
const char *copyright = "1999-2005";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
/*
* Additional inode code by Jorgen Lundman <lundman@lundman.net>
*/
#include "common.h"
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include <assert.h>
#include "popen.h"
#include "utils.h"
#include <stdarg.h>
#include "../lib/fsusage.h"
#include "../lib/mountlist.h"
#if HAVE_LIMITS_H
# include <limits.h>
#endif
/* If nonzero, show inode information. */
static int inode_format;
/* If nonzero, show even filesystems with zero size or
uninteresting types. */
static int show_all_fs = 1;
/* If nonzero, show only local filesystems. */
static int show_local_fs = 0;
/* If positive, the units to use when printing sizes;
if negative, the human-readable base. */
/* static int output_block_size; */
/* If nonzero, invoke the `sync' system call before getting any usage data.
Using this option can make df very slow, especially with many or very
busy disks. Note that this may make a difference on some systems --
SunOs4.1.3, for one. It is *not* necessary on Linux. */
/* static int require_sync = 0; */
/* A filesystem type to display. */
struct name_list
{
char *name;
int found;
int found_len;
uintmax_t w_df;
uintmax_t c_df;
double w_dfp;
double c_dfp;
double w_idfp;
double c_idfp;
struct name_list *name_next;
};
/* Linked list of filesystem types to display.
If `fs_select_list' is NULL, list all types.
This table is generated dynamically from command-line options,
rather than hardcoding into the program what it thinks are the
valid filesystem types; let the user specify any filesystem type
they want to, and if there are any filesystems of that type, they
will be shown.
Some filesystem types:
4.2 4.3 ufs nfs swap ignore io vm efs dbg */
/* static struct name_list *fs_select_list; */
/* Linked list of filesystem types to omit.
If the list is empty, don't exclude any types. */
static struct name_list *fs_exclude_list;
static struct name_list *dp_exclude_list;
static struct name_list *path_select_list;
static struct name_list *dev_select_list;
/* Linked list of mounted filesystems. */
static struct mount_entry *mount_list;
/* For long options that have no equivalent short option, use a
non-character as a pseudo short option, starting with CHAR_MAX + 1. */
enum
{
SYNC_OPTION = CHAR_MAX + 1,
NO_SYNC_OPTION,
BLOCK_SIZE_OPTION
};
#ifdef _AIX
#pragma alloca
#endif
int process_arguments (int, char **);
void print_path (const char *mypath);
int validate_arguments (uintmax_t, uintmax_t, double, double, double, double, char *);
int check_disk (double usp, uintmax_t free_disk, double uisp);
int walk_name_list (struct name_list *list, const char *name);
void print_help (void);
void print_usage (void);
uintmax_t w_df = 0;
uintmax_t c_df = 0;
double w_dfp = -1.0;
double c_dfp = -1.0;
double w_idfp = -1.0;
double c_idfp = -1.0;
char *path;
char *exclude_device;
char *units;
uintmax_t mult = 1024 * 1024;
int verbose = 0;
int erronly = FALSE;
int display_mntp = FALSE;
/* Linked list of mounted filesystems. */
static struct mount_entry *mount_list;
int
main (int argc, char **argv)
{
double usp = -1.0, uisp = -1.0;
int result = STATE_UNKNOWN;
int disk_result = STATE_UNKNOWN;
char file_system[MAX_INPUT_BUFFER];
char *output;
char *details;
char *perf;
uintmax_t psize;
float free_space, free_space_pct, total_space, inode_space_pct;
struct mount_entry *me;
struct fs_usage fsp;
struct name_list *temp_list;
output = strdup (" - free space:");
details = strdup ("");
perf = strdup ("");
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
mount_list = read_filesystem_list (0);
if (process_arguments (argc, argv) == ERROR)
usage4 (_("Could not parse arguments"));
/* if a list of paths has been selected, preseed the list with
* the longest matching filesystem name by iterating across
* the mountlist once ahead of time. this will allow a query on
* "/var/log" to return information about "/var" if no "/var/log"
* filesystem exists, etc. this is the default behavior already
* with df-based checks, but for systems with their own space
* checking routines, this should make them more consistent.
*/
if(path_select_list){
for (me = mount_list; me; me = me->me_next) {
walk_name_list(path_select_list, me->me_mountdir);
walk_name_list(path_select_list, me->me_devname);
}
/* now pretend we never saw anything, but keep found_len.
* thus future searches will only match the best match */
for (temp_list = path_select_list; temp_list; temp_list=temp_list->name_next){
temp_list->found=0;
}
}
/* for every mount entry */
for (me = mount_list; me; me = me->me_next) {
/* if there's a list of paths to select, the current mount
* entry matches in path or device name, get fs usage */
if (path_select_list &&
(walk_name_list (path_select_list, me->me_mountdir) ||
walk_name_list (path_select_list, me->me_devname) ) ) {
get_fs_usage (me->me_mountdir, me->me_devname, &fsp);
/* else if there's a list of paths/devices to select (but
* we didn't match above) skip to the next mount entry */
} else if (dev_select_list || path_select_list) {
continue;
/* skip remote filesystems if we're not interested in them */
} else if (me->me_remote && show_local_fs) {
continue;
/* skip pseudo fs's if we haven't asked for all fs's */
} else if (me->me_dummy && !show_all_fs) {
continue;
/* skip excluded fstypes */
} else if (fs_exclude_list && walk_name_list (fs_exclude_list, me->me_type)) {
continue;
/* skip excluded fs's */
} else if (dp_exclude_list &&
(walk_name_list (dp_exclude_list, me->me_devname) ||
walk_name_list (dp_exclude_list, me->me_mountdir))) {
continue;
/* otherwise, get fs usage */
} else {
get_fs_usage (me->me_mountdir, me->me_devname, &fsp);
}
if (fsp.fsu_blocks && strcmp ("none", me->me_mountdir)) {
usp = (double)(fsp.fsu_blocks - fsp.fsu_bavail) * 100 / fsp.fsu_blocks;
uisp = (double)(fsp.fsu_files - fsp.fsu_ffree) * 100 / fsp.fsu_files;
disk_result = check_disk (usp, fsp.fsu_bavail, uisp);
result = max_state (disk_result, result);
psize = fsp.fsu_blocks*fsp.fsu_blocksize/mult;
/* Moved this computation up here so we can add it
* to perf */
inode_space_pct = (float)fsp.fsu_ffree*100/fsp.fsu_files;
asprintf (&perf, "%s %s", perf,
perfdata ((!strcmp(file_system, "none") || display_mntp) ? me->me_devname : me->me_mountdir,
psize-(fsp.fsu_bavail*fsp.fsu_blocksize/mult), units,
TRUE, min ((uintmax_t)psize-(uintmax_t)w_df, (uintmax_t)((1.0-w_dfp/100.0)*psize)),
TRUE, min ((uintmax_t)psize-(uintmax_t)c_df, (uintmax_t)((1.0-c_dfp/100.0)*psize)),
TRUE, inode_space_pct,
TRUE, psize));
if (disk_result==STATE_OK && erronly && !verbose)
continue;
free_space = (float)fsp.fsu_bavail*fsp.fsu_blocksize/mult;
free_space_pct = (float)fsp.fsu_bavail*100/fsp.fsu_blocks;
total_space = (float)fsp.fsu_blocks*fsp.fsu_blocksize/mult;
if (disk_result!=STATE_OK || verbose>=0)
asprintf (&output, ("%s %s %.0f %s (%.0f%% inode=%.0f%%);"),
output,
(!strcmp(file_system, "none") || display_mntp) ? me->me_devname : me->me_mountdir,
free_space,
units,
free_space_pct,
inode_space_pct);
asprintf (&details, _("%s\n\
%.0f of %.0f %s (%.0f%% inode=%.0f%%) free on %s (type %s mounted on %s) warn:%lu crit:%lu warn%%:%.0f%% crit%%:%.0f%%"),
details, free_space, total_space, units, free_space_pct, inode_space_pct,
me->me_devname, me->me_type, me->me_mountdir,
(unsigned long)w_df, (unsigned long)c_df, w_dfp, c_dfp);
}
}
if (verbose > 2)
asprintf (&output, "%s%s", output, details);
/* Override result if paths specified and not found */
temp_list = path_select_list;
while (temp_list) {
if (!temp_list->found) {
asprintf (&output, _("%s [%s not found]"), output, temp_list->name);
result = STATE_CRITICAL;
}
temp_list = temp_list->name_next;
}
printf ("DISK %s%s|%s\n", state_text (result), output, perf);
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
struct name_list *se;
struct name_list **pathtail = &path_select_list;
struct name_list **fstail = &fs_exclude_list;
struct name_list **dptail = &dp_exclude_list;
struct name_list *temp_list;
int result = OK;
struct stat *stat_buf;
unsigned long l;
int option = 0;
static struct option longopts[] = {
{"timeout", required_argument, 0, 't'},
{"warning", required_argument, 0, 'w'},
{"critical", required_argument, 0, 'c'},
{"iwarning", required_argument, 0, 'W'},
/* Dang, -C is taken. We might want to reshuffle this. */
{"icritical", required_argument, 0, 'K'},
{"local", required_argument, 0, 'l'},
{"kilobytes", required_argument, 0, 'k'},
{"megabytes", required_argument, 0, 'm'},
{"units", required_argument, 0, 'u'},
{"path", required_argument, 0, 'p'},
{"partition", required_argument, 0, 'p'},
{"exclude_device", required_argument, 0, 'x'},
{"exclude-type", required_argument, 0, 'X'},
{"mountpoint", no_argument, 0, 'M'},
{"errors-only", no_argument, 0, 'e'},
{"verbose", no_argument, 0, 'v'},
{"quiet", no_argument, 0, 'q'},
{"clear", no_argument, 0, 'C'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
if (argc < 2)
return ERROR;
se = (struct name_list *) malloc (sizeof (struct name_list));
se->name = strdup ("iso9660");
se->name_next = NULL;
se->found = 0;
se->found_len = 0;
*fstail = se;
fstail = &se->name_next;
for (c = 1; c < argc; c++)
if (strcmp ("-to", argv[c]) == 0)
strcpy (argv[c], "-t");
while (1) {
c = getopt_long (argc, argv, "+?VqhveCt:c:w:K:W:u:p:x:X:mklM", longopts, &option);
if (c == -1 || c == EOF)
break;
switch (c) {
case 't': /* timeout period */
if (is_integer (optarg)) {
timeout_interval = atoi (optarg);
break;
}
else {
usage2 (_("Timeout interval must be a positive integer"), optarg);
}
case 'w': /* warning threshold */
if (is_intnonneg (optarg)) {
w_df = atoi (optarg);
break;
}
else if (strpbrk (optarg, ",:") &&
strstr (optarg, "%") &&
sscanf (optarg, "%lu%*[:,]%lf%%", &l, &w_dfp) == 2) {
w_df = (uintmax_t)l;
break;
}
else if (strstr (optarg, "%") && sscanf (optarg, "%lf%%", &w_dfp) == 1) {
break;
}
else {
usage4 (_("Warning threshold must be integer or percentage!"));
}
case 'c': /* critical threshold */
if (is_intnonneg (optarg)) {
c_df = atoi (optarg);
break;
}
else if (strpbrk (optarg, ",:") &&
strstr (optarg, "%") &&
sscanf (optarg, "%lu%*[,:]%lf%%", &l, &c_dfp) == 2) {
c_df = (uintmax_t)l;
break;
}
else if (strstr (optarg, "%") && sscanf (optarg, "%lf%%", &c_dfp) == 1) {
break;
}
else {
usage4 (_("Critical threshold must be integer or percentage!"));
}
case 'W': /* warning inode threshold */
if (strstr (optarg, "%") && sscanf (optarg, "%lf%%", &w_idfp) == 1) {
break;
}
else {
usage (_("Warning inode threshold must be percentage!\n"));
}
case 'K': /* kritical inode threshold */
if (strstr (optarg, "%") && sscanf (optarg, "%lf%%", &c_idfp) == 1) {
break;
}
else {
usage (_("Critical inode threshold must be percentage!\n"));
}
case 'u':
if (units)
free(units);
if (! strcmp (optarg, "bytes")) {
mult = (uintmax_t)1;
units = strdup ("B");
} else if (! strcmp (optarg, "kB")) {
mult = (uintmax_t)1024;
units = strdup ("kB");
} else if (! strcmp (optarg, "MB")) {
mult = (uintmax_t)1024 * 1024;
units = strdup ("MB");
} else if (! strcmp (optarg, "GB")) {
mult = (uintmax_t)1024 * 1024 * 1024;
units = strdup ("GB");
} else if (! strcmp (optarg, "TB")) {
mult = (uintmax_t)1024 * 1024 * 1024 * 1024;
units = strdup ("TB");
} else {
die (STATE_UNKNOWN, _("unit type %s not known\n"), optarg);
}
if (units == NULL)
die (STATE_UNKNOWN, _("failed allocating storage for '%s'\n"), "units");
break;
case 'k': /* display mountpoint */
mult = 1024;
if (units)
free(units);
units = strdup ("kB");
break;
case 'm': /* display mountpoint */
mult = 1024 * 1024;
if (units)
free(units);
units = strdup ("MB");
break;
case 'l':
show_local_fs = 1;
break;
case 'p': /* select path */
se = (struct name_list *) malloc (sizeof (struct name_list));
se->name = optarg;
se->name_next = NULL;
se->w_df = w_df;
se->c_df = c_df;
se->w_dfp = w_dfp;
se->c_dfp = c_dfp;
se->found = 0;
se->found_len = 0;
*pathtail = se;
pathtail = &se->name_next;
break;
case 'x': /* exclude path or partition */
se = (struct name_list *) malloc (sizeof (struct name_list));
se->name = optarg;
se->name_next = NULL;
/* If you don't clear the w_fd etc values here, they
* get processed when you walk the list and assigned
* to the global w_df!
*/
se->w_df = 0;
se->c_df = 0;
se->w_dfp = 0;
se->c_dfp = 0;
se->found = 0;
se->found_len = 0;
*dptail = se;
dptail = &se->name_next;
break;
case 'X': /* exclude file system type */
se = (struct name_list *) malloc (sizeof (struct name_list));
se->name = optarg;
se->name_next = NULL;
/* If you don't clear the w_fd etc values here, they
* get processed when you walk the list and assigned
* to the global w_df!
*/
se->w_df = 0;
se->c_df = 0;
se->w_dfp = 0;
se->c_dfp = 0;
se->found = 0;
se->found_len = 0;
*fstail = se;
fstail = &se->name_next;
break;
case 'v': /* verbose */
verbose++;
break;
case 'q': /* verbose */
verbose--;
break;
case 'e':
erronly = TRUE;
break;
case 'M': /* display mountpoint */
display_mntp = TRUE;
break;
case 'C':
w_df = 0;
c_df = 0;
w_dfp = -1.0;
c_dfp = -1.0;
break;
case 'V': /* version */
print_revision (progname, revision);
exit (STATE_OK);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case '?': /* help */
usage (_("Unknown argument"));
}
}
/* Support for "check_disk warn crit [fs]" with thresholds at used level */
c = optind;
if (w_dfp < 0 && argc > c && is_intnonneg (argv[c]))
w_dfp = (100.0 - atof (argv[c++]));
if (c_dfp < 0 && argc > c && is_intnonneg (argv[c]))
c_dfp = (100.0 - atof (argv[c++]));
if (argc > c && path == NULL) {
se = (struct name_list *) malloc (sizeof (struct name_list));
se->name = strdup (argv[c++]);
se->name_next = NULL;
se->w_df = w_df;
se->c_df = c_df;
se->w_dfp = w_dfp;
se->c_dfp = c_dfp;
se->found =0;
se->found_len = 0;
*pathtail = se;
}
if (path_select_list) {
temp_list = path_select_list;
stat_buf = malloc(sizeof *stat_buf);
while (temp_list) {
/* Stat each entry to check that dir exists */
if (stat (temp_list->name, &stat_buf[0])) {
printf("DISK %s - ", _("CRITICAL"));
die (STATE_CRITICAL, _("%s does not exist\n"), temp_list->name);
}
if (validate_arguments (temp_list->w_df,
temp_list->c_df,
temp_list->w_dfp,
temp_list->c_dfp,
temp_list->w_idfp,
temp_list->c_idfp,
temp_list->name) == ERROR)
result = ERROR;
temp_list = temp_list->name_next;
}
free(stat_buf);
return result;
} else {
return validate_arguments (w_df, c_df, w_dfp, c_dfp, w_idfp, c_idfp, NULL);
}
}
void
print_path (const char *mypath)
{
if (mypath == NULL)
printf ("\n");
else
printf (_(" for %s\n"), mypath);
return;
}
int
validate_arguments (uintmax_t w, uintmax_t c, double wp, double cp, double iwp, double icp, char *mypath)
{
if (w < 0 && c < 0 && wp < 0.0 && cp < 0.0) {
printf (_("INPUT ERROR: No thresholds specified"));
print_path (mypath);
return ERROR;
}
else if ((wp >= 0.0 || cp >= 0.0) &&
(wp < 0.0 || cp < 0.0 || wp > 100.0 || cp > 100.0 || cp > wp)) {
printf (_("\
INPUT ERROR: C_DFP (%f) should be less than W_DFP (%.1f) and both should be between zero and 100 percent, inclusive"),
cp, wp);
print_path (mypath);
return ERROR;
}
else if ((iwp >= 0.0 || icp >= 0.0) &&
(iwp < 0.0 || icp < 0.0 || iwp > 100.0 || icp > 100.0 || icp > iwp)) {
printf (_("\
INPUT ERROR: C_IDFP (%f) should be less than W_IDFP (%.1f) and both should be between zero and 100 percent, inclusive"),
icp, iwp);
print_path (mypath);
return ERROR;
}
else if ((w > 0 || c > 0) && (w == 0 || c == 0 || c > w)) {
printf (_("\
INPUT ERROR: C_DF (%lu) should be less than W_DF (%lu) and both should be greater than zero"),
(unsigned long)c, (unsigned long)w);
print_path (mypath);
return ERROR;
}
if (units == NULL) {
units = strdup ("MB");
mult = (uintmax_t)1024 * 1024;
}
return OK;
}
int
check_disk (double usp, uintmax_t free_disk, double uisp)
{
int result = STATE_UNKNOWN;
/* check the percent used space against thresholds */
if (usp >= 0.0 && c_dfp >=0.0 && usp >= (100.0 - c_dfp))
result = STATE_CRITICAL;
else if (uisp >= 0.0 && c_idfp >=0.0 && uisp >= (100.0 - c_idfp))
result = STATE_CRITICAL;
else if (c_df > 0 && free_disk <= c_df)
result = STATE_CRITICAL;
else if (usp >= 0.0 && w_dfp >=0.0 && usp >= (100.0 - w_dfp))
result = STATE_WARNING;
else if (uisp >= 0.0 && w_idfp >=0.0 && uisp >= (100.0 - w_idfp))
result = STATE_WARNING;
else if (w_df > 0 && free_disk <= w_df)
result = STATE_WARNING;
else if (usp >= 0.0)
result = STATE_OK;
return result;
}
int
walk_name_list (struct name_list *list, const char *name)
{
int name_len;
name_len = strlen(name);
while (list) {
/* if the paths match up to the length of the mount path,
* AND if the mount path name is longer than the longest
* found match, we have a new winner */
if (name_len >= list->found_len &&
! strncmp(list->name, name, name_len)) {
list->found = 1;
list->found_len = name_len;
/* if required for name_lists that have not saved w_df, etc (eg exclude lists) */
if (list->w_df) w_df = list->w_df;
if (list->c_df) c_df = list->c_df;
if (list->w_dfp>=0.0) w_dfp = list->w_dfp;
if (list->c_dfp>=0.0) c_dfp = list->c_dfp;
return TRUE;
}
list = list->name_next;
}
return FALSE;
}
void
print_help (void)
{
print_revision (progname, revision);
printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
printf (COPYRIGHT, copyright, email);
printf (_("This plugin checks the amount of used disk space on a mounted file system"));
printf (_("and generates an alert if free space is less than one of the threshold values"));
printf ("\n\n");
print_usage ();
printf (_(UT_HELP_VRSN));
printf (" %s\n", "-w, --warning=INTEGER");
printf (" %s\n", _("Exit with WARNING status if less than INTEGER units of disk are free"));
printf (" %s\n", "-w, --warning=PERCENT%");
printf (" %s\n", _("Exit with WARNING status if less than PERCENT of disk space is free"));
printf (" %s\n", "-W, --iwarning=PERCENT%");
printf (" %s\n", _("Exit with WARNING status if less than PERCENT of inode space is free"));
printf (" %s\n", "-K, --icritical=PERCENT%");
printf (" %s\n", _("Exit with CRITICAL status if less than PERCENT of inode space is free"));
printf (" %s\n", "-c, --critical=INTEGER");
printf (" %s\n", _("Exit with CRITICAL status if less than INTEGER units of disk are free"));
printf (" %s\n", "-c, --critical=PERCENT%");
printf (" %s\n", _("Exit with CRITCAL status if less than PERCENT of disk space is free"));
printf (" %s\n", "-C, --clear");
printf (" %s\n", _("Clear thresholds"));
printf (" %s\n", "-u, --units=STRING");
printf (" %s\n", _("Choose bytes, kB, MB, GB, TB (default: MB)"));
printf (" %s\n", "-k, --kilobytes");
printf (" %s\n", _("Same as '--units kB'"));
printf (" %s\n", "-m, --megabytes");
printf (" %s\n", _("Same as '--units MB'"));
printf (" %s\n", "-l, --local");
printf (" %s\n", _("Only check local filesystems"));
printf (" %s\n", "-p, --path=PATH, --partition=PARTITION");
printf (" %s\n", _("Path or partition (may be repeated)"));
printf (" %s\n", "-x, --exclude_device=PATH <STRING>");
printf (" %s\n", _("Ignore device (only works if -p unspecified)"));
printf (" %s\n", _("-X, --exclude-type=TYPE <STRING>"));
printf (" %s\n", _("Ignore all filesystems of indicated type (may be repeated)"));
printf (" %s\n", "-m, --mountpoint");
printf (" %s\n", _("Display the mountpoint instead of the partition"));
printf (" %s\n", "-e, --errors-only");
printf (" %s\n", _("Display only devices/mountpoints with errors"));
printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
printf (_(UT_VERBOSE));
printf ("\n");
printf ("%s\n", _("Examples:"));
printf (" %s\n", "check_disk -w 10% -c 5% -p /tmp -p /var -C -w 100000 -c 50000 -p /");
printf (" %s\n", _("Checks /tmp and /var at 10% and 5%, and / at 100MB and 50MB"));
printf (_(UT_SUPPORT));
}
void
print_usage (void)
{
printf (_("Usage:"));
printf (" %s -w limit -c limit [-p path | -x device] [-t timeout]", progname);
printf ("[-m] [-e] [-W limit] [-K limit] [-v] [-q]\n");
}
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