[Nagiosplug-devel] check_load arg parsing bugfix and cleanup
Andreas Ericsson
ae at op5.se
Fri May 27 09:10:17 CEST 2005
Feeling a bit stupid here, but I just found a bug in my patch. On system
with getloadavg(3) it will always return STATE_UNKNOWN if getloadavg
succeeds and no threshold value is overstepped.
Use the corrected patch attached here instead. The tracker has been updated.
Andreas Ericsson wrote:
> Ahoy.
>
> Here's a patch to check_load.c which removes a lot of duplicate code and
> some unnecessary complexity. It also fixes the argument parsing bug.
>
> LOC count is down by 10% and speed is up by about 15, so I guess that's
> a good thing.
>
> Apply with patch -p1 < nagiosplug-check_load.diff
>
> Next I'll rework the api for running commands, since that's the area
> where most plugins duplicate efforts and does so in a very non-efficient
> way. If someone else is already working on this, gimme a holler so we
> can coordinate the efforts.
>
>
> ------------------------------------------------------------------------
>
> diff -urN ../orig.nplg/plugins/check_load.c ./plugins/check_load.c
> --- ../orig.nplg/plugins/check_load.c 2005-05-27 15:56:34.000000000 +0200
> +++ ./plugins/check_load.c 2005-05-27 17:45:50.000000000 +0200
> @@ -39,37 +39,64 @@
> #endif /* !defined LOADAVG_1MIN */
>
>
> -int process_arguments (int argc, char **argv);
> -int validate_arguments (void);
> +static int process_arguments (int argc, char **argv);
> +static int validate_arguments (void);
> void print_help (void);
> void print_usage (void);
>
> -float wload1 = -1, wload5 = -1, wload15 = -1;
> -float cload1 = -1, cload5 = -1, cload15 = -1;
> +/* strictly for pretty-print usage in loops */
> +static const int nums[3] = { 1, 5, 15 };
> +
> +/* provide some fairly sane defaults */
> +double wload[3] = { 0.0, 0.0, 0.0 };
> +double cload[3] = { 0.0, 0.0, 0.0 };
> +#define la1 la[0]
> +#define la5 la[1]
> +#define la15 la[2]
>
> char *status_line;
>
> +static void
> +get_threshold(char *arg, double *th)
> +{
> + size_t i, n;
> + char *str = arg, *p;
> +
> + n = strlen(arg);
> + for(i = 0; i < 3; i++) {
> + th[i] = strtod(str, &p);
> + if(p == str) break;
> +
> + str = p + 1;
> + if(n <= (size_t)(str - arg)) break;
> + }
> +
> + /* empty argument or non-floatish, so warn about it and die */
> + if(!i) usage (_("Warning threshold must be float or float triplet!\n"));
> +
> + if(i != 2) {
> + /* one or more numbers were given, so fill array with last
> + * we got (most likely to NOT produce the least expected result) */
> + for(n = i; n < 3; n++) th[n] = th[i];
> + }
> +}
>
>
> int
> main (int argc, char **argv)
> {
> - int result = STATE_UNKNOWN;
> -
> -#if HAVE_GETLOADAVG==1
> + int result = STATE_OK;
> + int i;
> +
> double la[3] = { 0.0, 0.0, 0.0 }; /* NetBSD complains about unitialized arrays */
> -#else
> -# if HAVE_PROC_LOADAVG==1
> - FILE *fp;
> - char input_buffer[MAX_INPUT_BUFFER];
> - char *tmp_ptr;
> -# else
> +#ifndef HAVE_GETLOADAVG
> char input_buffer[MAX_INPUT_BUFFER];
> +# ifdef HAVE_PROC_LOADAVG
> + FILE *fp;
> + char *str, *next;
> # endif
> #endif
>
> - float la1, la5, la15;
> -
> setlocale (LC_ALL, "");
> bindtextdomain (PACKAGE, LOCALEDIR);
> textdomain (PACKAGE);
> @@ -77,30 +104,24 @@
> if (process_arguments (argc, argv) == ERROR)
> usage4 (_("Could not parse arguments"));
>
> -#if HAVE_GETLOADAVG==1
> +#ifdef HAVE_GETLOADAVG
> result = getloadavg (la, 3);
> if (result == -1)
> return STATE_UNKNOWN;
> - la1 = la[LOADAVG_1MIN];
> - la5 = la[LOADAVG_5MIN];
> - la15 = la[LOADAVG_15MIN];
> #else
> -# if HAVE_PROC_LOADAVG==1
> +# ifdef HAVE_PROC_LOADAVG
> fp = fopen (PROC_LOADAVG, "r");
> if (fp == NULL) {
> printf (_("Error opening %s\n"), PROC_LOADAVG);
> return STATE_UNKNOWN;
> }
>
> - la1 = la5 = la15 = -1;
> -
> while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
> - tmp_ptr = strtok (input_buffer, " ");
> - la1 = atof (tmp_ptr);
> - tmp_ptr = strtok (NULL, " ");
> - la5 = atof (tmp_ptr);
> - tmp_ptr = strtok (NULL, " ");
> - la15 = atof (tmp_ptr);
> + str = (char *)input_buffer;
> + for(i = 0; i < 3; i++) {
> + la[i] = strtod(str, &next);
> + str = next;
> + }
> }
>
> fclose (fp);
> @@ -126,11 +147,11 @@
> #endif
>
>
> - if ((la1 < 0.0) || (la5 < 0.0) || (la15 < 0.0)) {
> -#if HAVE_GETLOADAVG==1
> + if ((la[0] < 0.0) || (la[1] < 0.0) || (la[2] < 0.0)) {
> +#ifdef HAVE_GETLOADAVG
> printf (_("Error in getloadavg()\n"));
> #else
> -# if HAVE_PROC_LOADAVG==1
> +# ifdef HAVE_PROC_LOADAVG
> printf (_("Error processing %s\n"), PROC_LOADAVG);
> # else
> printf (_("Error processing %s\n"), PATH_TO_UPTIME);
> @@ -141,27 +162,25 @@
>
> asprintf(&status_line, _("load average: %.2f, %.2f, %.2f"), la1, la5, la15);
>
> - if ((la1 >= cload1) || (la5 >= cload5) || (la15 >= cload15))
> - result = STATE_CRITICAL;
> - else if ((la1 >= wload1) || (la5 >= wload5) || (la15 >= wload15))
> - result = STATE_WARNING;
> - else
> - result = STATE_OK;
> -
> - die (result,
> - "%s - %s|%s %s %s\n",
> - state_text (result),
> - status_line,
> - fperfdata ("load1", la1, "", (int)wload1, wload1, (int)cload1, cload1, TRUE, 0, FALSE, 0),
> - fperfdata ("load5", la5, "", (int)wload5, wload5, (int)cload5, cload5, TRUE, 0, FALSE, 0),
> - fperfdata ("load15", la15, "", (int)wload15, wload15, (int)cload15, cload15, TRUE, 0, FALSE, 0));
> - return STATE_OK;
> -}
> + for(i = 0; i < 3; i++) {
> + if(la[i] > cload[i]) {
> + result = STATE_CRITICAL;
> + break;
> + }
> + else if(la[i] > wload[i]) result = STATE_WARNING;
> + }
>
> + printf("%s - %s|", state_text(result), status_line);
> + for(i = 0; i < 3; i++)
> + printf("load%d=%.3f;%.3f;%.3f;0; ", nums[i], la[i], wload[i], cload[i]);
> +
> + putchar('\n');
> + return result;
> +}
>
>
> /* process command-line arguments */
> -int
> +static int
> process_arguments (int argc, char **argv)
> {
> int c = 0;
> @@ -185,37 +204,11 @@
> break;
>
> switch (c) {
> - case 'w': /* warning time threshold */
> - if (is_intnonneg (optarg)) {
> - wload1 = atof (optarg);
> - wload5 = atof (optarg);
> - wload15 = atof (optarg);
> - break;
> - }
> - else if (strstr (optarg, ",") &&
> - sscanf (optarg, "%f,%f,%f", &wload1, &wload5, &wload15) == 3)
> - break;
> - else if (strstr (optarg, ":") &&
> - sscanf (optarg, "%f:%f:%f", &wload1, &wload5, &wload15) == 3)
> - break;
> - else
> - usage (_("Warning threshold must be float or float triplet!\n"));
> + case 'w': /* warning time threshold */
> + get_threshold(optarg, wload);
> break;
> - case 'c': /* critical time threshold */
> - if (is_intnonneg (optarg)) {
> - cload1 = atof (optarg);
> - cload5 = atof (optarg);
> - cload15 = atof (optarg);
> - break;
> - }
> - else if (strstr (optarg, ",") &&
> - sscanf (optarg, "%f,%f,%f", &cload1, &cload5, &cload15) == 3)
> - break;
> - else if (strstr (optarg, ":") &&
> - sscanf (optarg, "%f:%f:%f", &cload1, &cload5, &cload15) == 3)
> - break;
> - else
> - usage (_("Critical threshold must be float or float triplet!\n"));
> + case 'c': /* critical time threshold */
> + get_threshold(optarg, cload);
> break;
> case 'V': /* version */
> print_revision (progname, revision);
> @@ -231,60 +224,38 @@
> c = optind;
> if (c == argc)
> return validate_arguments ();
> - if (wload1 < 0 && is_nonnegative (argv[c]))
> - wload1 = atof (argv[c++]);
> -
> - if (c == argc)
> - return validate_arguments ();
> - if (cload1 < 0 && is_nonnegative (argv[c]))
> - cload1 = atof (argv[c++]);
> -
> - if (c == argc)
> - return validate_arguments ();
> - if (wload5 < 0 && is_nonnegative (argv[c]))
> - wload5 = atof (argv[c++]);
> -
> - if (c == argc)
> - return validate_arguments ();
> - if (cload5 < 0 && is_nonnegative (argv[c]))
> - cload5 = atof (argv[c++]);
>
> - if (c == argc)
> - return validate_arguments ();
> - if (wload15 < 0 && is_nonnegative (argv[c]))
> - wload15 = atof (argv[c++]);
> -
> - if (c == argc)
> - return validate_arguments ();
> - if (cload15 < 0 && is_nonnegative (argv[c]))
> - cload15 = atof (argv[c++]);
> + /* handle the case if both arguments are missing,
> + * but not if only one is given without -c or -w flag */
> + if(c - argc == 2) {
> + get_threshold(argv[c++], wload);
> + get_threshold(argv[c++], cload);
> + }
> + else if(c - argc == 1) {
> + get_threshold(argv[c++], cload);
> + }
>
> return validate_arguments ();
> }
>
>
>
> -int
> +static int
> validate_arguments (void)
> {
> - if (wload1 < 0)
> - usage (_("Warning threshold for 1-minute load average is not specified\n"));
> - if (wload5 < 0)
> - usage (_("Warning threshold for 5-minute load average is not specified\n"));
> - if (wload15 < 0)
> - usage (_("Warning threshold for 15-minute load average is not specified\n"));
> - if (cload1 < 0)
> - usage (_("Critical threshold for 1-minute load average is not specified\n"));
> - if (cload5 < 0)
> - usage (_("Critical threshold for 5-minute load average is not specified\n"));
> - if (cload15 < 0)
> - usage (_("Critical threshold for 15-minute load average is not specified\n"));
> - if (wload1 > cload1)
> - usage (_("Parameter inconsistency: 1-minute \"warning load\" greater than \"critical load\".\n"));
> - if (wload5 > cload5)
> - usage (_("Parameter inconsistency: 5-minute \"warning load\" greater than \"critical load\".\n"));
> - if (wload15 > cload15)
> - usage (_("Parameter inconsistency: 15-minute \"warning load\" greater than \"critical load\".\n"));
> + int i = 0;
> +
> + /* match cload first, as it will give the most friendly error message
> + * if user hasn't given the -c switch properly */
> + for(i = 0; i < 3; i++) {
> + if(cload[i] < 0)
> + die (STATE_UNKNOWN, _("Critical threshold for %d-minute load average is not specified\n"), nums[i]);
> + if(wload[i] < 0)
> + die (STATE_UNKNOWN, _("Warning threshold for %d-minute load average is not specified\n"), nums[i]);
> + if(wload[i] > cload[i])
> + die (STATE_UNKNOWN, _("Parameter inconsistency: %d-minute \"warning load\" is greater than \"critical load\"\n"), nums[i]);
> + }
> +
> return OK;
> }
--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Lead Developer
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: nagiosplug-check_load.diff
URL: <http://nagios-plugins.org/archive/devel/attachments/20050527/d1c3655f/attachment.ksh>
More information about the Devel
mailing list