plugins/check_load.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_load plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 1999-2007 Nagios Plugins Development Team
   7 *
   8 * Description:
   9 *
  10 * This file contains the check_load plugin
  11 *
  12 * This plugin tests the current system load average.
  13 *
  14 *
  15 * This program is free software: you can redistribute it and/or modify
  16 * it under the terms of the GNU General Public License as published by
  17 * the Free Software Foundation, either version 3 of the License, or
  18 * (at your option) any later version.
  19 *
  20 * This program is distributed in the hope that it will be useful,
  21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 * GNU General Public License for more details.
  24 *
  25 * You should have received a copy of the GNU General Public License
  26 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27 *
  28 *
  29 *****************************************************************************/
  30
  31 const char *progname = "check_load";
  32 const char *copyright = "1999-2007";
  33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  34
  35 #include "common.h"
  36 #include "utils.h"
  37 #include "popen.h"
  38
  39 #ifdef HAVE_SYS_LOADAVG_H
  40 #include <sys/loadavg.h>
  41 #endif
  42
  43 /* needed for compilation under NetBSD, as suggested by Andy Doran */
  44 #ifndef LOADAVG_1MIN
  45 #define LOADAVG_1MIN    0
  46 #define LOADAVG_5MIN    1
  47 #define LOADAVG_15MIN   2
  48 #endif /* !defined LOADAVG_1MIN */
  49
  50
  51 static int process_arguments (int argc, char **argv);
  52 static int validate_arguments (void);
  53 void print_help (void);
  54 void print_usage (void);
  55
  56 /* strictly for pretty-print usage in loops */
  57 static const int nums[3] = { 1, 5, 15 };
  58
  59 /* provide some fairly sane defaults */
  60 double wload[3] = { 0.0, 0.0, 0.0 };
  61 double cload[3] = { 0.0, 0.0, 0.0 };
  62 #define la1 la[0]
  63 #define la5 la[1]
  64 #define la15 la[2]
  65
  66 char *status_line;
  67 int take_into_account_cpus = 0;
  68
  69 static void
  70 get_threshold(char *arg, double *th)
  71 {
  72         size_t i, n;
  73         int valid = 0;
  74         char *str = arg, *p;
  75
  76         n = strlen(arg);
  77         for(i = 0; i < 3; i++) {
  78                 th[i] = strtod(str, &p);
  79                 if(p == str) break;
  80
  81                 valid = 1;
  82                 str = p + 1;
  83                 if(n <= (size_t)(str - arg)) break;
  84         }
  85
  86         /* empty argument or non-floatish, so warn about it and die */
  87         if(!i && !valid) usage (_("Warning threshold must be float or float triplet!\n"));
  88
  89         if(i != 2) {
  90                 /* one or more numbers were given, so fill array with last
  91                  * we got (most likely to NOT produce the least expected result) */
  92                 for(n = i; n < 3; n++) th[n] = th[i];
  93         }
  94 }
  95
  96
  97 int
  98 main (int argc, char **argv)
  99 {
 100         int result;
 101         int i;
 102         long numcpus;
 103
 104         double la[3] = { 0.0, 0.0, 0.0 };       /* NetBSD complains about unitialized arrays */
 105 #ifndef HAVE_GETLOADAVG
 106         char input_buffer[MAX_INPUT_BUFFER];
 107 # ifdef HAVE_PROC_LOADAVG
 108         FILE *fp;
 109         char *str, *next;
 110 # endif
 111 #endif
 112
 113         setlocale (LC_ALL, "");
 114         bindtextdomain (PACKAGE, LOCALEDIR);
 115         textdomain (PACKAGE);
 116         setlocale(LC_NUMERIC, "POSIX");
 117
 118         /* Parse extra opts if any */
 119         argv = np_extra_opts (&argc, argv, progname);
 120
 121         if (process_arguments (argc, argv) == ERROR)
 122                 usage4 (_("Could not parse arguments"));
 123
 124 #ifdef HAVE_GETLOADAVG
 125         result = getloadavg (la, 3);
 126         if (result != 3)
 127                 return STATE_UNKNOWN;
 128 #else
 129 # ifdef HAVE_PROC_LOADAVG
 130         fp = fopen (PROC_LOADAVG, "r");
 131         if (fp == NULL) {
 132                 printf (_("Error opening %s\n"), PROC_LOADAVG);
 133                 return STATE_UNKNOWN;
 134         }
 135
 136         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
 137                 str = (char *)input_buffer;
 138                 for(i = 0; i < 3; i++) {
 139                         la[i] = strtod(str, &next);
 140                         str = next;
 141                 }
 142         }
 143
 144         fclose (fp);
 145 # else
 146         child_process = spopen (PATH_TO_UPTIME);
 147         if (child_process == NULL) {
 148                 printf (_("Error opening %s\n"), PATH_TO_UPTIME);
 149                 return STATE_UNKNOWN;
 150         }
 151         child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
 152         if (child_stderr == NULL) {
 153                 printf (_("Could not open stderr for %s\n"), PATH_TO_UPTIME);
 154         }
 155         fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process);
 156         sscanf (input_buffer, "%*[^l]load average: %lf, %lf, %lf", &la1, &la5, &la15);
 157
 158         result = spclose (child_process);
 159         if (result) {
 160                 printf (_("Error code %d returned in %s\n"), result, PATH_TO_UPTIME);
 161                 return STATE_UNKNOWN;
 162         }
 163 # endif
 164 #endif
 165
 166         if (take_into_account_cpus == 1) {
 167                 if ((numcpus = GET_NUMBER_OF_CPUS()) > 0) {
 168                         la[0] = la[0] / numcpus;
 169                         la[1] = la[1] / numcpus;
 170                         la[2] = la[2] / numcpus;
 171                 }
 172         }
 173         if ((la[0] < 0.0) || (la[1] < 0.0) || (la[2] < 0.0)) {
 174 #ifdef HAVE_GETLOADAVG
 175                 printf (_("Error in getloadavg()\n"));
 176 #else
 177 # ifdef HAVE_PROC_LOADAVG
 178                 printf (_("Error processing %s\n"), PROC_LOADAVG);
 179 # else
 180                 printf (_("Error processing %s\n"), PATH_TO_UPTIME);
 181 # endif
 182 #endif
 183                 return STATE_UNKNOWN;
 184         }
 185
 186         /* we got this far, so assume OK until we've measured */
 187         result = STATE_OK;
 188
 189         asprintf(&status_line, _("load average: %.2f, %.2f, %.2f"), la1, la5, la15);
 190
 191         for(i = 0; i < 3; i++) {
 192                 if(la[i] > cload[i]) {
 193                         result = STATE_CRITICAL;
 194                         break;
 195                 }
 196                 else if(la[i] > wload[i]) result = STATE_WARNING;
 197         }
 198
 199         printf("%s - %s|", state_text(result), status_line);
 200         for(i = 0; i < 3; i++)
 201                 printf("load%d=%.3f;%.3f;%.3f;0; ", nums[i], la[i], wload[i], cload[i]);
 202
 203         putchar('\n');
 204         return result;
 205 }
 206
 207
 208 /* process command-line arguments */
 209 static int
 210 process_arguments (int argc, char **argv)
 211 {
 212         int c = 0;
 213
 214         int option = 0;
 215         static struct option longopts[] = {
 216                 {"warning", required_argument, 0, 'w'},
 217                 {"critical", required_argument, 0, 'c'},
 218                 {"percpu", no_argument, 0, 'r'},
 219                 {"version", no_argument, 0, 'V'},
 220                 {"help", no_argument, 0, 'h'},
 221                 {0, 0, 0, 0}
 222         };
 223
 224         if (argc < 2)
 225                 return ERROR;
 226
 227         while (1) {
 228                 c = getopt_long (argc, argv, "Vhrc:w:", longopts, &option);
 229
 230                 if (c == -1 || c == EOF)
 231                         break;
 232
 233                 switch (c) {
 234                 case 'w': /* warning time threshold */
 235                         get_threshold(optarg, wload);
 236                         break;
 237                 case 'c': /* critical time threshold */
 238                         get_threshold(optarg, cload);
 239                         break;
 240                 case 'r': /* Divide load average by number of CPUs */
 241                         take_into_account_cpus = 1;
 242                         break;
 243                 case 'V':                                                                       /* version */
 244                         print_revision (progname, NP_VERSION);
 245                         exit (STATE_OK);
 246                 case 'h':                                                                       /* help */
 247                         print_help ();
 248                         exit (STATE_OK);
 249                 case '?':                                                                       /* help */
 250                         usage5 ();
 251                 }
 252         }
 253
 254         c = optind;
 255         if (c == argc)
 256                 return validate_arguments ();
 257
 258         /* handle the case if both arguments are missing,
 259          * but not if only one is given without -c or -w flag */
 260         if(c - argc == 2) {
 261                 get_threshold(argv[c++], wload);
 262                 get_threshold(argv[c++], cload);
 263         }
 264         else if(c - argc == 1) {
 265                 get_threshold(argv[c++], cload);
 266         }
 267
 268         return validate_arguments ();
 269 }
 270
 271
 272
 273 static int
 274 validate_arguments (void)
 275 {
 276         int i = 0;
 277
 278         /* match cload first, as it will give the most friendly error message
 279          * if user hasn't given the -c switch properly */
 280         for(i = 0; i < 3; i++) {
 281                 if(cload[i] < 0)
 282                         die (STATE_UNKNOWN, _("Critical threshold for %d-minute load average is not specified\n"), nums[i]);
 283                 if(wload[i] < 0)
 284                         die (STATE_UNKNOWN, _("Warning threshold for %d-minute load average is not specified\n"), nums[i]);
 285                 if(wload[i] > cload[i])
 286                         die (STATE_UNKNOWN, _("Parameter inconsistency: %d-minute \"warning load\" is greater than \"critical load\"\n"), nums[i]);
 287         }
 288
 289         return OK;
 290 }
 291
 292
 293
 294 void
 295 print_help (void)
 296 {
 297         print_revision (progname, NP_VERSION);
 298
 299         printf ("Copyright (c) 1999 Felipe Gustavo de Almeida <galmeida@linux.ime.usp.br>\n");
 300         printf (COPYRIGHT, copyright, email);
 301
 302         printf (_("This plugin tests the current system load average."));
 303
 304   printf ("\n\n");
 305
 306         print_usage ();
 307
 308         printf (_(UT_HELP_VRSN));
 309         printf (_(UT_EXTRA_OPTS));
 310
 311         printf (" %s\n", "-w, --warning=WLOAD1,WLOAD5,WLOAD15");
 312   printf ("    %s\n", _("Exit with WARNING status if load average exceeds WLOADn"));
 313   printf (" %s\n", "-c, --critical=CLOAD1,CLOAD5,CLOAD15");
 314   printf ("    %s\n", _("Exit with CRITICAL status if load average exceed CLOADn"));
 315   printf ("    %s\n", _("the load average format is the same used by \"uptime\" and \"w\""));
 316   printf (" %s\n", "-r, --percpu");
 317   printf ("    %s\n", _("Divide the load averages by the number of CPUs (when possible)"));
 318
 319 #ifdef NP_EXTRA_OPTS
 320         printf ("\n");
 321         printf ("%s\n", _("Notes:"));
 322         printf (_(UT_EXTRA_OPTS_NOTES));
 323 #endif
 324
 325         printf (_(UT_SUPPORT));
 326 }
 327
 328 void
 329 print_usage (void)
 330 {
 331   printf (_("Usage:"));
 332         printf ("%s [-r] -w WLOAD1,WLOAD5,WLOAD15 -c CLOAD1,CLOAD5,CLOAD15\n", progname);
 333 }