plugins/check_by_ssh.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_by_ssh plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2000-2008 Nagios Plugins Development Team
   7 *
   8 * Description:
   9 *
  10 * This file contains the check_by_ssh plugin
  11 *
  12 *
  13 * This program is free software: you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation, either version 3 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25 *
  26 *
  27 *****************************************************************************/
  28
  29 const char *progname = "check_by_ssh";
  30 const char *copyright = "2000-2008";
  31 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  32
  33 #include "common.h"
  34 #include "netutils.h"
  35 #include "utils.h"
  36 #include "runcmd.h"
  37
  38 int process_arguments (int, char **);
  39 int validate_arguments (void);
  40 void print_help (void);
  41 void print_usage (void);
  42
  43 unsigned int commands = 0;
  44 unsigned int services = 0;
  45 int skip_stdout = 0;
  46 int skip_stderr = 0;
  47 char *remotecmd = NULL;
  48 char *comm = NULL;
  49 char *hostname = NULL;
  50 char *outputfile = NULL;
  51 char *host_shortname = NULL;
  52 char **service;
  53 int passive = FALSE;
  54 int verbose = FALSE;
  55
  56 int
  57 main (int argc, char **argv)
  58 {
  59
  60         char *status_text;
  61         int cresult;
  62         int result = STATE_UNKNOWN;
  63         int i;
  64         time_t local_time;
  65         FILE *fp = NULL;
  66         struct output chld_out, chld_err;
  67
  68         remotecmd = "";
  69         comm = strdup (SSH_COMMAND);
  70
  71         setlocale (LC_ALL, "");
  72         bindtextdomain (PACKAGE, LOCALEDIR);
  73         textdomain (PACKAGE);
  74
  75         /* Parse extra opts if any */
  76         argv=np_extra_opts (&argc, argv, progname);
  77
  78         /* process arguments */
  79         if (process_arguments (argc, argv) == ERROR)
  80                 usage_va(_("Could not parse arguments"));
  81
  82         /* Set signal handling and alarm timeout */
  83         if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
  84                 usage_va(_("Cannot catch SIGALRM"));
  85         }
  86         alarm (timeout_interval);
  87
  88         /* run the command */
  89         if (verbose)
  90                 printf ("%s\n", comm);
  91
  92         result = np_runcmd(comm, &chld_out, &chld_err, 0);
  93
  94         if (skip_stdout == -1) /* --skip-stdout specified without argument */
  95                 skip_stdout = chld_out.lines;
  96         if (skip_stderr == -1) /* --skip-stderr specified without argument */
  97                 skip_stderr = chld_err.lines;
  98
  99         /* UNKNOWN or worse if (non-skipped) output found on stderr */
 100         if(chld_err.lines > skip_stderr) {
 101                 printf (_("Remote command execution failed: %s\n"),
 102                         chld_err.line[skip_stderr]);
 103                 return max_state_alt(result, STATE_UNKNOWN);
 104         }
 105
 106         /* this is simple if we're not supposed to be passive.
 107          * Wrap up quickly and keep the tricks below */
 108         if(!passive) {
 109                 if (chld_out.lines > skip_stdout)
 110                         for (i = skip_stdout; i < chld_out.lines; i++)
 111                                 puts (chld_out.line[i]);
 112                 else
 113                         printf (_("%s - check_by_ssh: Remote command '%s' returned status %d\n"),
 114                                 state_text(result), remotecmd, result);
 115                 return result;  /* return error status from remote command */
 116         }
 117
 118
 119         /*
 120          * Passive mode
 121          */
 122
 123         /* process output */
 124         if (!(fp = fopen (outputfile, "a"))) {
 125                 printf (_("SSH WARNING: could not open %s\n"), outputfile);
 126                 exit (STATE_UNKNOWN);
 127         }
 128
 129         local_time = time (NULL);
 130         commands = 0;
 131         for(i = skip_stdout; i < chld_out.lines; i++) {
 132                 status_text = chld_out.line[i++];
 133                 if (i == chld_out.lines || strstr (chld_out.line[i], "STATUS CODE: ") == NULL)
 134                         die (STATE_UNKNOWN, _("%s: Error parsing output\n"), progname);
 135
 136                 if (service[commands] && status_text
 137                         && sscanf (chld_out.line[i], "STATUS CODE: %d", &cresult) == 1)
 138                 {
 139                         fprintf (fp, "[%d] PROCESS_SERVICE_CHECK_RESULT;%s;%s;%d;%s\n",
 140                                  (int) local_time, host_shortname, service[commands++],
 141                                  cresult, status_text);
 142                 }
 143         }
 144
 145         /* Multiple commands and passive checking should always return OK */
 146         return result;
 147 }
 148
 149 /* process command-line arguments */
 150 int
 151 process_arguments (int argc, char **argv)
 152 {
 153         int c;
 154         char *p1, *p2;
 155
 156         int option = 0;
 157         static struct option longopts[] = {
 158                 {"version", no_argument, 0, 'V'},
 159                 {"help", no_argument, 0, 'h'},
 160                 {"verbose", no_argument, 0, 'v'},
 161                 {"fork", no_argument, 0, 'f'},
 162                 {"timeout", required_argument, 0, 't'},
 163                 {"host", required_argument, 0, 'H'},
 164                 {"port", required_argument,0,'p'},
 165                 {"output", required_argument, 0, 'O'},
 166                 {"name", required_argument, 0, 'n'},
 167                 {"services", required_argument, 0, 's'},
 168                 {"identity", required_argument, 0, 'i'},
 169                 {"user", required_argument, 0, 'u'},
 170                 {"logname", required_argument, 0, 'l'},
 171                 {"command", required_argument, 0, 'C'},
 172                 {"skip", optional_argument, 0, 'S'}, /* backwards compatibility */
 173                 {"skip-stdout", optional_argument, 0, 'S'},
 174                 {"skip-stderr", optional_argument, 0, 'E'},
 175                 {"proto1", no_argument, 0, '1'},
 176                 {"proto2", no_argument, 0, '2'},
 177                 {"use-ipv4", no_argument, 0, '4'},
 178                 {"use-ipv6", no_argument, 0, '6'},
 179                 {"ssh-option", required_argument, 0, 'o'},
 180                 {"quiet", no_argument, 0, 'q'},
 181                 {0, 0, 0, 0}
 182         };
 183
 184         if (argc < 2)
 185                 return ERROR;
 186
 187         for (c = 1; c < argc; c++)
 188                 if (strcmp ("-to", argv[c]) == 0)
 189                         strcpy (argv[c], "-t");
 190
 191         while (1) {
 192                 c = getopt_long (argc, argv, "Vvh1246fqt:H:O:p:i:u:l:C:S::E::n:s:o:", longopts,
 193                                  &option);
 194
 195                 if (c == -1 || c == EOF)
 196                         break;
 197
 198                 switch (c) {
 199                 case 'V':                                                                       /* version */
 200                         print_revision (progname, NP_VERSION);
 201                         exit (STATE_OK);
 202                 case 'h':                                                                       /* help */
 203                         print_help ();
 204                         exit (STATE_OK);
 205                 case 'v':                                                                       /* help */
 206                         verbose = TRUE;
 207                         break;
 208                 case 't':                                                                       /* timeout period */
 209                         if (!is_integer (optarg))
 210                                 usage_va(_("Timeout interval must be a positive integer"));
 211                         else
 212                                 timeout_interval = atoi (optarg);
 213                         break;
 214                 case 'H':                                                                       /* host */
 215                         host_or_die(optarg);
 216                         hostname = optarg;
 217                         break;
 218                 case 'p': /* port number */
 219                         if (!is_integer (optarg))
 220                                 usage_va(_("Port must be a positive integer"));
 221                         asprintf (&comm,"%s -p %s", comm, optarg);
 222                         break;
 223                 case 'O':                                                                       /* output file */
 224                         outputfile = optarg;
 225                         passive = TRUE;
 226                         break;
 227                 case 's':                                                                       /* description of service to check */
 228                         p1 = optarg;
 229                         service = realloc (service, (++services) * sizeof(char *));
 230                         while ((p2 = index (p1, ':'))) {
 231                                 *p2 = '\0';
 232                                 service[services - 1] = p1;
 233                                 service = realloc (service, (++services) * sizeof(char *));
 234                                 p1 = p2 + 1;
 235                         }
 236                         service[services - 1] = p1;
 237                         break;
 238                 case 'n':                                                                       /* short name of host in nagios configuration */
 239                         host_shortname = optarg;
 240                         break;
 241
 242                 case 'u':
 243                         c = 'l';
 244                 case 'l':                                                                       /* login name */
 245                 case 'i':                                                                       /* identity */
 246                         asprintf (&comm, "%s -%c %s", comm, c, optarg);
 247                         break;
 248
 249                 case '1':                                                                       /* Pass these switches directly to ssh */
 250                 case '2':                                                                       /* 1 to force version 1, 2 to force version 2 */
 251                 case '4':                                                                       /* -4 for IPv4 */
 252                 case '6':                                                               /* -6 for IPv6 */
 253                 case 'f':                                                                       /* fork to background */
 254                         asprintf (&comm, "%s -%c", comm, c);
 255                         break;
 256                 case 'C':                                                                       /* Command for remote machine */
 257                         commands++;
 258                         if (commands > 1)
 259                                 asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
 260                         asprintf (&remotecmd, "%s%s", remotecmd, optarg);
 261                         break;
 262                 case 'S':                                                                       /* skip n (or all) lines on stdout */
 263                         if (optarg == NULL)
 264                                 skip_stdout = -1; /* skip all output on stdout */
 265                         else if (!is_integer (optarg))
 266                                 usage_va(_("skip-stdout argument must be an integer"));
 267                         else
 268                                 skip_stdout = atoi (optarg);
 269                         break;
 270                 case 'E':                                                                       /* skip n (or all) lines on stderr */
 271                         if (optarg == NULL)
 272                                 skip_stderr = -1; /* skip all output on stderr */
 273                         else if (!is_integer (optarg))
 274                                 usage_va(_("skip-stderr argument must be an integer"));
 275                         else
 276                                 skip_stderr = atoi (optarg);
 277                         break;
 278                 case 'o':                                                                       /* Extra options for the ssh command */
 279                         asprintf (&comm, "%s -%c '%s'", comm, c, optarg);
 280                         break;
 281                 case 'q':                                                                       /* Tell the ssh command to be quiet */
 282                         asprintf (&comm, "%s -%c", comm, c);
 283                         break;
 284                 default:                                                                        /* help */
 285                         usage5();
 286                 }
 287         }
 288
 289         c = optind;
 290         if (hostname == NULL) {
 291                 if (c <= argc) {
 292                         die (STATE_UNKNOWN, _("%s: You must provide a host name\n"), progname);
 293                 }
 294                 host_or_die(argv[c]);
 295                 hostname = argv[c++];
 296         }
 297
 298         if (strlen(remotecmd) == 0) {
 299                 for (; c < argc; c++)
 300                         if (strlen(remotecmd) > 0)
 301                                 asprintf (&remotecmd, "%s %s", remotecmd, argv[c]);
 302                         else
 303                                 asprintf (&remotecmd, "%s", argv[c]);
 304         }
 305
 306         if (commands > 1 || passive)
 307                 asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
 308
 309         if (remotecmd == NULL || strlen (remotecmd) <= 1)
 310                 usage_va(_("No remotecmd"));
 311
 312         asprintf (&comm, "%s %s '%s'", comm, hostname, remotecmd);
 313
 314         return validate_arguments ();
 315 }
 316
 317
 318
 319 int
 320 validate_arguments (void)
 321 {
 322         if (remotecmd == NULL || hostname == NULL)
 323                 return ERROR;
 324
 325         if (passive && commands != services)
 326                 die (STATE_UNKNOWN, _("%s: In passive mode, you must provide a service name for each command.\n"), progname);
 327
 328         if (passive && host_shortname == NULL)
 329                 die (STATE_UNKNOWN, _("%s: In passive mode, you must provide the host short name from the nagios configs.\n"), progname);
 330
 331         return OK;
 332 }
 333
 334
 335 void
 336 print_help (void)
 337 {
 338         print_revision (progname, NP_VERSION);
 339
 340         printf ("Copyright (c) 1999 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
 341         printf (COPYRIGHT, copyright, email);
 342
 343         printf (_("This plugin uses SSH to execute commands on a remote host"));
 344
 345   printf ("\n\n");
 346
 347         print_usage ();
 348
 349         printf (_(UT_HELP_VRSN));
 350
 351         printf (_(UT_EXTRA_OPTS));
 352
 353         printf (_(UT_HOST_PORT), 'p', "none");
 354
 355         printf (_(UT_IPv46));
 356
 357   printf (" %s\n", "-1, --proto1");
 358   printf ("    %s\n", _("tell ssh to use Protocol 1 [optional]"));
 359   printf (" %s\n", "-2, --proto2");
 360   printf ("    %s\n", _("tell ssh to use Protocol 2 [optional]"));
 361   printf (" %s\n", "-S, --skip-stdout[=n]");
 362   printf ("    %s\n", _("Ignore all or (if specified) first n lines on STDOUT [optional]"));
 363   printf (" %s\n", "-E, --skip-stderr[=n]");
 364   printf ("    %s\n", _("Ignore all or (if specified) first n lines on STDERR [optional]"));
 365   printf (" %s\n", "-f");
 366   printf ("    %s\n", _("tells ssh to fork rather than create a tty [optional]. This will always return OK if ssh is executed"));
 367   printf (" %s\n","-C, --command='COMMAND STRING'");
 368   printf ("    %s\n", _("command to execute on the remote machine"));
 369   printf (" %s\n","-l, --logname=USERNAME");
 370   printf ("    %s\n", _("SSH user name on remote host [optional]"));
 371   printf (" %s\n","-i, --identity=KEYFILE");
 372   printf ("    %s\n", _("identity of an authorized key [optional]"));
 373   printf (" %s\n","-O, --output=FILE");
 374   printf ("    %s\n", _("external command file for nagios [optional]"));
 375   printf (" %s\n","-s, --services=LIST");
 376   printf ("    %s\n", _("list of nagios service names, separated by ':' [optional]"));
 377   printf (" %s\n","-n, --name=NAME");
 378   printf ("    %s\n", _("short name of host in nagios configuration [optional]"));
 379   printf (" %s\n","-o, --ssh-option=OPTION");
 380   printf ("    %s\n", _("Call ssh with '-o OPTION' (may be used multiple times) [optional]"));
 381   printf (" %s\n","-q, --quiet");
 382   printf ("    %s\n", _("Tell ssh to suppress warning and diagnostic messages [optional]"));
 383         printf (_(UT_WARN_CRIT));
 384         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 385         printf (_(UT_VERBOSE));
 386         printf("\n");
 387   printf (" %s\n", _("The most common mode of use is to refer to a local identity file with"));
 388   printf (" %s\n", _("the '-i' option. In this mode, the identity pair should have a null"));
 389   printf (" %s\n", _("passphrase and the public key should be listed in the authorized_keys"));
 390   printf (" %s\n", _("file of the remote host. Usually the key will be restricted to running"));
 391   printf (" %s\n", _("only one command on the remote server. If the remote SSH server tracks"));
 392   printf (" %s\n", _("invocation arguments, the one remote program may be an agent that can"));
 393   printf (" %s\n", _("execute additional commands as proxy"));
 394   printf("\n");
 395   printf (" %s\n", _("To use passive mode, provide multiple '-C' options, and provide"));
 396   printf (" %s\n", _("all of -O, -s, and -n options (servicelist order must match '-C'options)"));
 397   printf ("\n");
 398   printf ("%s\n", _("Examples:"));
 399   printf (" %s\n", "$ check_by_ssh -H localhost -n lh -s c1:c2:c3 -C uptime -C uptime -C uptime -O /tmp/foo");
 400   printf (" %s\n", "$ cat /tmp/foo");
 401   printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c1;0; up 2 days");
 402   printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c2;0; up 2 days");
 403   printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c3;0; up 2 days");
 404
 405 #ifdef NP_EXTRA_OPTS
 406         printf("\n");
 407         printf("%s\n", _("Notes:"));
 408         printf(_(UT_EXTRA_OPTS_NOTES));
 409 #endif
 410
 411         printf(_(UT_SUPPORT));
 412 }
 413
 414
 415
 416 void
 417 print_usage (void)
 418 {
 419         printf (_("Usage:"));
 420         printf (" %s -H <host> -C <command> [-fqv] [-1|-2] [-4|-6]\n"
 421                 "       [-S [lines]] [-E [lines]] [-t timeout] [-i identity]\n"
 422                 "       [-l user] [-n name] [-s servicelist] [-O outputfile]\n"
 423                 "       [-p port] [-o ssh-option]\n",
 424                 progname);
 425 }