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/*****************************************************************************
*
* Monitoring negate plugin
*
* License: GPL
* Copyright (c) 2002-2008 Monitoring Plugins Development Team
*
* Description:
*
* This file contains the negate plugin
*
* Negates the status of a plugin (returns OK for CRITICAL, and vice-versa).
* Can also perform custom state switching.
*
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*
*****************************************************************************/
const char *progname = "negate";
const char *copyright = "2002-2008";
const char *email = "devel@monitoring-plugins.org";
#define DEFAULT_TIMEOUT 11
#include "common.h"
#include "utils.h"
#include "utils_cmd.h"
#include <ctype.h>
/* char *command_line; */
static const char **process_arguments(int, char **);
void validate_arguments(char **);
void print_help(void);
void print_usage(void);
bool subst_text = false;
static int state[4] = {
STATE_OK,
STATE_WARNING,
STATE_CRITICAL,
STATE_UNKNOWN,
};
int main(int argc, char **argv) {
int result = STATE_UNKNOWN;
char *sub;
char **command_line;
output chld_out, chld_err;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
timeout_interval = DEFAULT_TIMEOUT;
command_line = (char **)process_arguments(argc, argv);
/* Set signal handling and alarm */
if (signal(SIGALRM, timeout_alarm_handler) == SIG_ERR)
die(STATE_UNKNOWN, _("Cannot catch SIGALRM"));
(void)alarm((unsigned)timeout_interval);
/* catch when the command is quoted */
if (command_line[1] == NULL) {
result = cmd_run(command_line[0], &chld_out, &chld_err, 0);
} else {
result = cmd_run_array(command_line, &chld_out, &chld_err, 0);
}
if (chld_err.lines > 0) {
for (size_t i = 0; i < chld_err.lines; i++) {
fprintf(stderr, "%s\n", chld_err.line[i]);
}
}
/* Return UNKNOWN or worse if no output is returned */
if (chld_out.lines == 0)
die(max_state_alt(result, STATE_UNKNOWN), _("No data returned from command\n"));
for (size_t i = 0; i < chld_out.lines; i++) {
if (subst_text && result >= 0 && result <= 4 && result != state[result]) {
/* Loop over each match found */
while ((sub = strstr(chld_out.line[i], state_text(result)))) {
/* Terminate the first part and skip over the string we'll substitute */
*sub = '\0';
sub += strlen(state_text(result));
/* then put everything back together */
xasprintf(&chld_out.line[i], "%s%s%s", chld_out.line[i], state_text(state[result]), sub);
}
}
printf("%s\n", chld_out.line[i]);
}
if (result >= 0 && result <= 4) {
exit(state[result]);
} else {
exit(result);
}
}
/* process command-line arguments */
static const char **process_arguments(int argc, char **argv) {
int c;
bool permute = true;
int option = 0;
static struct option longopts[] = {{"help", no_argument, 0, 'h'}, {"version", no_argument, 0, 'V'},
{"timeout", required_argument, 0, 't'}, {"timeout-result", required_argument, 0, 'T'},
{"ok", required_argument, 0, 'o'}, {"warning", required_argument, 0, 'w'},
{"critical", required_argument, 0, 'c'}, {"unknown", required_argument, 0, 'u'},
{"substitute", no_argument, 0, 's'}, {0, 0, 0, 0}};
while (1) {
c = getopt_long(argc, argv, "+hVt:T:o:w:c:u:s", longopts, &option);
if (c == -1 || c == EOF)
break;
switch (c) {
case '?': /* help */
usage5();
break;
case 'h': /* help */
print_help();
exit(EXIT_SUCCESS);
break;
case 'V': /* version */
print_revision(progname, NP_VERSION);
exit(EXIT_SUCCESS);
case 't': /* timeout period */
if (!is_integer(optarg))
usage2(_("Timeout interval must be a positive integer"), optarg);
else
timeout_interval = atoi(optarg);
break;
case 'T': /* Result to return on timeouts */
if ((timeout_state = mp_translate_state(optarg)) == ERROR)
usage4(_("Timeout result must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
break;
case 'o': /* replacement for OK */
if ((state[STATE_OK] = mp_translate_state(optarg)) == ERROR)
usage4(_("Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
permute = false;
break;
case 'w': /* replacement for WARNING */
if ((state[STATE_WARNING] = mp_translate_state(optarg)) == ERROR)
usage4(_("Warning must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
permute = false;
break;
case 'c': /* replacement for CRITICAL */
if ((state[STATE_CRITICAL] = mp_translate_state(optarg)) == ERROR)
usage4(_("Critical must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
permute = false;
break;
case 'u': /* replacement for UNKNOWN */
if ((state[STATE_UNKNOWN] = mp_translate_state(optarg)) == ERROR)
usage4(_("Unknown must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
permute = false;
break;
case 's': /* Substitute status text */
subst_text = true;
break;
}
}
validate_arguments(&argv[optind]);
if (permute) { /* No [owcu] switch specified, default to this */
state[STATE_OK] = STATE_CRITICAL;
state[STATE_CRITICAL] = STATE_OK;
}
return (const char **)&argv[optind];
}
void validate_arguments(char **command_line) {
if (command_line[0] == NULL)
usage4(_("Could not parse arguments"));
if (strncmp(command_line[0], "/", 1) != 0 && strncmp(command_line[0], "./", 2) != 0)
usage4(_("Require path to command"));
}
void print_help(void) {
print_revision(progname, NP_VERSION);
printf(COPYRIGHT, copyright, email);
printf("%s\n", _("Negates only the return code of a plugin (returns OK for CRITICAL and vice-versa) by default."));
printf("%s\n", _("Additional switches can be used to control:\n"));
printf("\t - which state becomes what\n");
printf("\t - changing the plugin output text to match the return code");
printf("\n\n");
print_usage();
printf(UT_HELP_VRSN);
printf(UT_PLUG_TIMEOUT, timeout_interval);
printf(" %s\n", _("Keep timeout longer than the plugin timeout to retain CRITICAL status."));
printf(" -T, --timeout-result=STATUS\n");
printf(" %s\n", _("Custom result on Negate timeouts; see below for STATUS definition\n"));
printf(" -o, --ok=STATUS\n");
printf(" -w, --warning=STATUS\n");
printf(" -c, --critical=STATUS\n");
printf(" -u, --unknown=STATUS\n");
printf(_(" STATUS can be 'OK', 'WARNING', 'CRITICAL' or 'UNKNOWN' without single\n"));
printf(_(" quotes. Numeric values are accepted. If nothing is specified, permutes\n"));
printf(_(" OK and CRITICAL.\n"));
printf(" -s, --substitute\n");
printf(_(" Substitute output text as well. Will only substitute text in CAPITALS\n"));
printf("\n");
printf("%s\n", _("Examples:"));
printf(" %s\n", "negate /usr/local/nagios/libexec/check_ping -H host");
printf(" %s\n", _("Run check_ping and invert result. Must use full path to plugin"));
printf(" %s\n", "negate -w OK -c UNKNOWN /usr/local/nagios/libexec/check_procs -a 'vi negate.c'");
printf(" %s\n", _("This will return OK instead of WARNING and UNKNOWN instead of CRITICAL"));
printf("\n");
printf("%s\n", _("Notes:"));
printf(" %s\n", _("This plugin is a wrapper to take the output of another plugin and invert it."));
printf(" %s\n", _("The full path of the plugin must be provided."));
printf(" %s\n", _("If the wrapped plugin returns OK, the wrapper will return CRITICAL."));
printf(" %s\n", _("If the wrapped plugin returns CRITICAL, the wrapper will return OK."));
printf(" %s\n", _("Otherwise, the output state of the wrapped plugin is unchanged."));
printf("\n");
printf(" %s\n", _("Using timeout-result, it is possible to override the timeout behaviour or a"));
printf(" %s\n", _("plugin by setting the negate timeout a bit lower."));
printf(UT_SUPPORT);
}
void print_usage(void) {
printf("%s\n", _("Usage:"));
printf("%s [-t timeout] [-Towcu STATE] [-s] <definition of wrapped plugin>\n", progname);
}
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