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