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check_mysql.c

/******************************************************************************
*
* CHECK_MYSQL.C
*
* Program: Mysql plugin for Nagios
* License: GPL
* Copyright (c) 1999 Didi Rieder (adrieder@sbox.tu-graz.ac.at)
*  portions (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
* 
* $Id: check_mysql.c,v 1.24 2004/12/25 23:17:44 opensides Exp $
*
* Description:
*
* This plugin is for testing a mysql server.
******************************************************************************/

const char *progname = "check_mysql";
const char *revision = "$Revision: 1.24 $";
const char *copyright = "1999-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#define SLAVERESULTSIZE 40

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

#include <mysql/mysql.h>
#include <mysql/errmsg.h>

char *db_user = NULL;
char *db_host = NULL;
char *db_pass = NULL;
char *db = NULL;
unsigned int db_port = MYSQL_PORT;
int check_slave = 0;

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



int
main (int argc, char **argv)
{

      MYSQL mysql;
      MYSQL_RES *res;
      MYSQL_ROW row;
      
      /* should be status */
      
      char *result = NULL;
      char slaveresult[SLAVERESULTSIZE];

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

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

      /* initialize mysql  */
      mysql_init (&mysql);

      /* establish a connection to the server and error checking */
      if (!mysql_real_connect(&mysql,db_host,db_user,db_pass,db,db_port,NULL,0)) {
            if (mysql_errno (&mysql) == CR_UNKNOWN_HOST)
                  die (STATE_WARNING, "%s\n", mysql_error (&mysql));
            else if (mysql_errno (&mysql) == CR_VERSION_ERROR)
                  die (STATE_WARNING, "%s\n", mysql_error (&mysql));
            else if (mysql_errno (&mysql) == CR_OUT_OF_MEMORY)
                  die (STATE_WARNING, "%s\n", mysql_error (&mysql));
            else if (mysql_errno (&mysql) == CR_IPSOCK_ERROR)
                  die (STATE_WARNING, "%s\n", mysql_error (&mysql));
            else if (mysql_errno (&mysql) == CR_SOCKET_CREATE_ERROR)
                  die (STATE_WARNING, "%s\n", mysql_error (&mysql));
            else
                  die (STATE_CRITICAL, "%s\n", mysql_error (&mysql));
      }

      /* get the server stats */
      result = strdup (mysql_stat (&mysql));

      /* error checking once more */
      if (mysql_error (&mysql)) {
            if (mysql_errno (&mysql) == CR_SERVER_GONE_ERROR)
                  die (STATE_CRITICAL, "%s\n", mysql_error (&mysql));
            else if (mysql_errno (&mysql) == CR_SERVER_LOST)
                  die (STATE_CRITICAL, "%s\n", mysql_error (&mysql));
            else if (mysql_errno (&mysql) == CR_UNKNOWN_ERROR)
                  die (STATE_CRITICAL, "%s\n", mysql_error (&mysql));
      }

      if(check_slave) {
            /* check the slave status */
            if (mysql_query (&mysql, "show slave status") != 0) {
                  mysql_close (&mysql);
                  die (STATE_CRITICAL, _("slave query error: %s\n"), mysql_error (&mysql));
            }

            /* store the result */
            if ( (res = mysql_store_result (&mysql)) == NULL) {
                  mysql_close (&mysql);
                  die (STATE_CRITICAL, _("slave store_result error: %s\n"), mysql_error (&mysql));
            }

            /* fetch the first row */
            if ( (row = mysql_fetch_row (res)) == NULL) {
                  mysql_free_result (res);
                  mysql_close (&mysql);
                  die (STATE_CRITICAL, _("slave fetch row error: %s\n"), mysql_error (&mysql));
            }

            if (mysql_field_count (&mysql) == 12) {
                  /* mysql 3.23.x */
                  snprintf (slaveresult, SLAVERESULTSIZE, _("Slave running: %s"), row[6]);
                  if (strcmp (row[6], "Yes") != 0) {
                        mysql_free_result (res);
                        mysql_close (&mysql);
                        die (STATE_CRITICAL, "%s\n", slaveresult);
                  }

            } else {
                  /* mysql 4.x.x */
                  snprintf (slaveresult, SLAVERESULTSIZE, "Slave IO: %s Slave SQL: %s", row[9], row[10]);
                  if (strcmp (row[9], "Yes") != 0 || strcmp (row[10], "Yes") != 0) {
                        mysql_free_result (res);
                        mysql_close (&mysql);
                        die (STATE_CRITICAL, "%s\n", slaveresult);
                  }
            }

            /* free the result */
            mysql_free_result (res);
      }

      /* close the connection */
      mysql_close (&mysql);

      /* print out the result of stats */
      if (check_slave) {
            printf ("%s %s\n", result, slaveresult);
      } else {
            printf ("%s\n", result);
      }

      return STATE_OK;
}


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

      int option = 0;
      static struct option longopts[] = {
            {"hostname", required_argument, 0, 'H'},
            {"database", required_argument, 0, 'd'},
            {"username", required_argument, 0, 'u'},
            {"password", required_argument, 0, 'p'},
            {"port", required_argument, 0, 'P'},
            {"check-slave", no_argument, 0, 'S'},
            {"verbose", no_argument, 0, 'v'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}
      };

      if (argc < 1)
            return ERROR;

      while (1) {
            c = getopt_long (argc, argv, "hVSP:p:u:d:H:", longopts, &option);

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

            switch (c) {
            case 'H':                                                   /* hostname */
                  if (is_host (optarg)) {
                        db_host = optarg;
                  }
                  else {
                        usage2 (_("Invalid hostname/address"), optarg);
                  }
                  break;
            case 'd':                                                   /* hostname */
                  db = optarg;
                  break;
            case 'u':                                                   /* username */
                  db_user = optarg;
                  break;
            case 'p':                                                   /* authentication information: password */
                  db_pass = optarg;
                  break;
            case 'P':                                                   /* critical time threshold */
                  db_port = atoi (optarg);
                  break;
            case 'S':
                  check_slave = 1;                                      /* check-slave */
                  break;
            case 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case '?':                                                   /* help */
                  usage2 (_("Unknown argument"), optarg);
            }
      }

      c = optind;

      while ( argc > c ) {

            if (strlen(db_host) == 0)
                  if (is_host (argv[c])) {
                        db_host = argv[c++];
                  }
                  else {
                        usage2 (_("Invalid hostname/address"), optarg);
                  }
            else if (strlen(db_user) == 0)
                  db_user = argv[c++];
            else if (strlen(db_pass) == 0)
                  db_pass = argv[c++];
            else if (strlen(db) == 0)
                  db = argv[c++];
            else if (is_intnonneg (argv[c]))
                  db_port = atoi (argv[c++]);
            else
                  break;
      }

      return validate_arguments ();
}


int
validate_arguments (void)
{
      if (db_user == NULL)
            db_user = strdup("");

      if (db_host == NULL)
            db_host = strdup("");

      if (db_pass == NULL)
            db_pass == strdup("");

      if (db == NULL)
            db = strdup("");

      return OK;
}


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

      print_revision (progname, revision);

      printf (_(COPYRIGHT), copyright, email);

      printf (_("This program tests connections to a mysql server\n"));

      print_usage ();

      printf (_(UT_HELP_VRSN));

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

      printf (_("\
 -d, --database=STRING\n\
   Check database with indicated name\n\
 -u, --username=STRING\n\
   Connect using the indicated username\n\
 -p, --password=STRING\n\
   Use the indicated password to authenticate the connection\n\
   ==> IMPORTANT: THIS FORM OF AUTHENTICATION IS NOT SECURE!!! <==\n\
   Your clear-text password will be visible as a process table entry\n\
 -S, --check-slave\n\
   Check if the slave thread is running properly.\n"));

      printf (_("\n\
There are no required arguments. By default, the local database with\n\
a server listening on MySQL standard port %d will be checked\n"), MYSQL_PORT);

      printf (_(UT_SUPPORT));
}


void
print_usage (void)
{
      printf ("\
Usage: %s [-d database] [-H host] [-P port] [-u user] [-p password] [-S]\n",
              progname);
}

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