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check_overcr.c

/******************************************************************************

 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: check_overcr.c,v 1.19 2004/12/25 23:17:44 opensides Exp $
 
******************************************************************************/

const char *progname = "check_overcr";
const char *revision = "$Revision: 1.19 $";
const char *copyright = "2000-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "netutils.h"
#include "utils.h"

enum checkvar {
      NONE,
      LOAD1,
      LOAD5,
      LOAD15,
      DPU,
      PROCS,
      NETSTAT,
      UPTIME
};

enum {
      PORT = 2000
};

char *server_address = NULL;
int server_port = PORT;
double warning_value = 0L;
double critical_value = 0L;
int check_warning_value = FALSE;
int check_critical_value = FALSE;
enum checkvar vars_to_check = NONE;
int cmd_timeout = 1;

int netstat_port = 0;
char *disk_name = NULL;
char *process_name = NULL;
      char send_buffer[MAX_INPUT_BUFFER];

int process_arguments (int, char **);
void print_usage (void);
void print_help (void);

int
main (int argc, char **argv)
{
      int result = STATE_UNKNOWN;
      char recv_buffer[MAX_INPUT_BUFFER];
      char temp_buffer[MAX_INPUT_BUFFER];
      char *temp_ptr = NULL;
      int found_disk = FALSE;
      unsigned long percent_used_disk_space = 100;
      double load;
      double load_1min;
      double load_5min;
      double load_15min;
      int port_connections = 0;
      int processes = 0;
      double uptime_raw_hours;
      int uptime_raw_minutes = 0;
      int uptime_days = 0;
      int uptime_hours = 0;
      int uptime_minutes = 0;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

      /* initialize alarm signal handling */
      signal (SIGALRM, socket_timeout_alarm_handler);

      /* set socket timeout */
      alarm (socket_timeout);

      result = process_tcp_request2 (server_address,
                                     server_port,
                                     send_buffer,
                                     recv_buffer,
                                     sizeof (recv_buffer));

      switch (vars_to_check) {

      case LOAD1:
      case LOAD5:
      case LOAD15:
      
            if (result != STATE_OK)
                  die (result, _("Unknown error fetching load data\n"));

            temp_ptr = (char *) strtok (recv_buffer, "\r\n");
            if (temp_ptr == NULL)
                  die (STATE_CRITICAL, _("Invalid response from server - no load information\n"));
            else
                  load_1min = strtod (temp_ptr, NULL);

            temp_ptr = (char *) strtok (NULL, "\r\n");
            if (temp_ptr == NULL)
                  die (STATE_CRITICAL, _("Invalid response from server after load 1\n"));
            else
                  load_5min = strtod (temp_ptr, NULL);

            temp_ptr = (char *) strtok (NULL, "\r\n");
            if (temp_ptr == NULL)
                  die (STATE_CRITICAL, _("Invalid response from server after load 5\n"));
            else
                  load_15min = strtod (temp_ptr, NULL);

            switch (vars_to_check) {
            case LOAD1:
                  strcpy (temp_buffer, "1");
                  load = load_1min;
                  break;
            case LOAD5:
                  strcpy (temp_buffer, "5");
                  load = load_5min;
                  break;
            default:
                  strcpy (temp_buffer, "15");
                  load = load_15min;
                  break;
            }

            if (check_critical_value == TRUE && (load >= critical_value))
                  result = STATE_CRITICAL;
            else if (check_warning_value == TRUE && (load >= warning_value))
                  result = STATE_WARNING;

            die (result,
                      _("Load %s - %s-min load average = %0.2f"),
                                           state_text(result),
                      temp_buffer,
                      load);

                  break;

      case DPU:

            if (result != STATE_OK)
                  die (result, _("Unknown error fetching disk data\n"));

            for (temp_ptr = (char *) strtok (recv_buffer, " ");
                 temp_ptr != NULL;
                 temp_ptr = (char *) strtok (NULL, " ")) {

                  if (!strcmp (temp_ptr, disk_name)) {
                        found_disk = TRUE;
                        temp_ptr = (char *) strtok (NULL, "%");
                        if (temp_ptr == NULL)
                              die (STATE_CRITICAL, _("Invalid response from server\n"));
                        else
                              percent_used_disk_space = strtoul (temp_ptr, NULL, 10);
                        break;
                  }

                  temp_ptr = (char *) strtok (NULL, "\r\n");
            }

            /* error if we couldn't find the info for the disk */
            if (found_disk == FALSE)
                  die (STATE_CRITICAL,
                             "CRITICAL - Disk '%s' non-existent or not mounted",
                             disk_name);

            if (check_critical_value == TRUE && (percent_used_disk_space >= critical_value))
                  result = STATE_CRITICAL;
            else if (check_warning_value == TRUE && (percent_used_disk_space >= warning_value))
                  result = STATE_WARNING;

            die (result, "Disk %s - %lu%% used on %s", state_text(result), percent_used_disk_space, disk_name);

            break;

      case NETSTAT:

            if (result != STATE_OK)
                  die (result, _("Unknown error fetching network status\n"));
            else
                  port_connections = strtod (recv_buffer, NULL);

            if (check_critical_value == TRUE && (port_connections >= critical_value))
                  result = STATE_CRITICAL;
            else if (check_warning_value == TRUE && (port_connections >= warning_value))
                  result = STATE_WARNING;

            die (result,
                       _("Net %s - %d connection%s on port %d"),
                       state_text(result),
                       port_connections,
                       (port_connections == 1) ? "" : "s",
                       netstat_port);

            break;

      case PROCS:

            if (result != STATE_OK)
                  die (result, _("Unknown error fetching process status\n"));

            temp_ptr = (char *) strtok (recv_buffer, "(");
            if (temp_ptr == NULL)
                  die (STATE_CRITICAL, _("Invalid response from server\n"));

            temp_ptr = (char *) strtok (NULL, ")");
            if (temp_ptr == NULL)
                  die (STATE_CRITICAL, _("Invalid response from server\n"));
            else
                  processes = strtod (temp_ptr, NULL);

            if (check_critical_value == TRUE && (processes >= critical_value))
                  result = STATE_CRITICAL;
            else if (check_warning_value == TRUE && (processes >= warning_value))
                  result = STATE_WARNING;

            die (result,
                       _("Process %s - %d instance%s of %s running"),
                       state_text(result),
                       processes,
                       (processes == 1) ? "" : "s",
                       process_name);
            break;

      case UPTIME:

            if (result != STATE_OK)
                  return result;

            uptime_raw_hours = strtod (recv_buffer, NULL);
            uptime_raw_minutes = (unsigned long) (uptime_raw_hours * 60.0);

            if (check_critical_value == TRUE && (uptime_raw_minutes <= critical_value))
                  result = STATE_CRITICAL;
            else if (check_warning_value == TRUE && (uptime_raw_minutes <= warning_value))
                  result = STATE_WARNING;

            uptime_days = uptime_raw_minutes / 1440;
            uptime_raw_minutes %= 1440;
            uptime_hours = uptime_raw_minutes / 60;
            uptime_raw_minutes %= 60;
            uptime_minutes = uptime_raw_minutes;

            die (result,
                       _("Uptime %s - Up %d days %d hours %d minutes"),
                       state_text(result),
                       uptime_days,
                       uptime_hours,
                       uptime_minutes);
            break;

      default:
            die (STATE_UNKNOWN, _("Nothing to check!\n"));
            break;
      }
}


/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
      int c;

      int option = 0;
      static struct option longopts[] = {
            {"port", required_argument, 0, 'p'},
            {"timeout", required_argument, 0, 't'},
            {"critical", required_argument, 0, 'c'},
            {"warning", required_argument, 0, 'w'},
            {"variable", required_argument, 0, 'v'},
            {"hostname", required_argument, 0, 'H'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}
      };

      /* no options were supplied */
      if (argc < 2)
            return ERROR;

      /* backwards compatibility */
      if (!is_option (argv[1])) {
            server_address = argv[1];
            argv[1] = argv[0];
            argv = &argv[1];
            argc--;
      }

      for (c = 1; c < argc; c++) {
            if (strcmp ("-to", argv[c]) == 0)
                  strcpy (argv[c], "-t");
            else if (strcmp ("-wv", argv[c]) == 0)
                  strcpy (argv[c], "-w");
            else if (strcmp ("-cv", argv[c]) == 0)
                  strcpy (argv[c], "-c");
      }

      while (1) {
            c = getopt_long (argc, argv, "+hVH:t:c:w:p:v:", longopts,
                                                       &option);

            if (c == -1 || c == EOF || c == 1)
                  break;

            switch (c) {
            case '?':                                                   /* print short usage statement if args not parsable */
                  usage2 (_("Unknown argument"), optarg);
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 'H':                                                   /* hostname */
                  server_address = optarg;
                  break;
            case 'p':                                                   /* port */
                  if (is_intnonneg (optarg))
                        server_port = atoi (optarg);
                  else
                        die (STATE_UNKNOWN,
                                                       _("Server port an integer\n"));
                  break;
            case 'v':                                                   /* variable */
                  if (strcmp (optarg, "LOAD") == 0) {
                        strcpy (send_buffer, "LOAD\r\nQUIT\r\n");
                        if (strcmp (optarg, "LOAD1") == 0)
                              vars_to_check = LOAD1;
                        else if (strcmp (optarg, "LOAD5") == 0)
                              vars_to_check = LOAD5;
                        else if (strcmp (optarg, "LOAD15") == 0)
                              vars_to_check = LOAD15;
                  }
                  else if (strcmp (optarg, "UPTIME") == 0) {
                        vars_to_check = UPTIME;
                        strcpy (send_buffer, "UPTIME\r\n");
                  }
                  else if (strstr (optarg, "PROC") == optarg) {
                        vars_to_check = PROCS;
                        process_name = strscpy (process_name, optarg + 4);
                        sprintf (send_buffer, "PROCESS %s\r\n", process_name);
                  }
                  else if (strstr (optarg, "NET") == optarg) {
                        vars_to_check = NETSTAT;
                        netstat_port = atoi (optarg + 3);
                        sprintf (send_buffer, "NETSTAT %d\r\n", netstat_port);
                  }
                  else if (strstr (optarg, "DPU") == optarg) {
                        vars_to_check = DPU;
                        strcpy (send_buffer, "DISKSPACE\r\n");
                        disk_name = strscpy (disk_name, optarg + 3);
                  }
                  else
                        return ERROR;
                  break;
            case 'w':                                                   /* warning threshold */
                  warning_value = strtoul (optarg, NULL, 10);
                  check_warning_value = TRUE;
                  break;
            case 'c':                                                   /* critical threshold */
                  critical_value = strtoul (optarg, NULL, 10);
                  check_critical_value = TRUE;
                  break;
            case 't':                                                   /* timeout */
                  socket_timeout = atoi (optarg);
                  if (socket_timeout <= 0)
                        return ERROR;
            }

      }
      return OK;
}


void
print_help (void)
{
      char *myport;
      asprintf (&myport, "%d", PORT);

      print_revision (progname, revision);

      printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
      printf (COPYRIGHT, copyright, email);

      printf (_("\
This plugin attempts to contact the Over-CR collector daemon running on the\n\
remote UNIX server in order to gather the requested system information.\n\n"));

      print_usage ();

      printf (_(UT_HELP_VRSN));

      printf (_(UT_HOST_PORT), 'p', myport);

      printf (_("\
-v, --variable=STRING\n\
   Variable to check.  Valid variables include:\n\
     LOAD1         = 1 minute average CPU load\n\
     LOAD5         = 5 minute average CPU load\n\
     LOAD15        = 15 minute average CPU load\n\
     DPU<filesys>  = percent used disk space on filesystem <filesys>\n\
     PROC<process> = number of running processes with name <process>\n\
     NET<port>     = number of active connections on TCP port <port>\n\
     UPTIME        = system uptime in seconds\n"));

      printf (_("\
 -w, --warning=INTEGER\n\
   Threshold which will result in a warning status\n\
 -c, --critical=INTEGER\n\
   Threshold which will result in a critical status\n"));

      printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);

      printf (_("\
Notes:\n\
 - For the available options, the critical threshold value should always be\n\
   higher than the warning threshold value, EXCEPT with the uptime variable\n\n"));

      printf (_("\
 - This plugin requres that Eric Molitors' Over-CR collector daemon be\n\
   running on the remote server. Over-CR can be downloaded from\n\
   http://www.molitor.org/overcr (This plugin was tested with version\n\
   0.99.53 of the Over-CR collector)\n\n"));

      printf (_(UT_SUPPORT));
}


void
print_usage (void)
{
      printf ("\
Usage: %s -H host [-p port] [-v variable] [-w warning] [-c critical]\n\
                    [-t timeout]\n", progname);
}

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