plugins/check_by_ssh.c

   1 /******************************************************************************
   2 *
   3 * Nagios check_by_ssh plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 1999-2006 nagios-plugins team
   7 *
   8 * Last Modified: $Date$
   9 *
  10 * Description:
  11 *
  12 * This file contains the check_by_ssh plugin
  13 *
  14 * License Information:
  15 *
  16 * This program is free software; you can redistribute it and/or modify
  17 * it under the terms of the GNU General Public License as published by
  18 * the Free Software Foundation; either version 2 of the License, or
  19 * (at your option) any later version.
  20 *
  21 * This program is distributed in the hope that it will be useful,
  22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 * GNU General Public License for more details.
  25 *
  26 * You should have received a copy of the GNU General Public License
  27 * along with this program; if not, write to the Free Software
  28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29 *
  30 * $Id$
  31 *
  32 ******************************************************************************/
  33
  34 const char *progname = "check_by_ssh";
  35 const char *revision = "$Revision$";
  36 const char *copyright = "2000-2006";
  37 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  38
  39 #include "common.h"
  40 #include "netutils.h"
  41 #include "utils.h"
  42 #include "runcmd.h"
  43
  44 int process_arguments (int, char **);
  45 int validate_arguments (void);
  46 void print_help (void);
  47 void print_usage (void);
  48
  49 unsigned int commands = 0;
  50 unsigned int services = 0;
  51 int skip_stdout = 0;
  52 int skip_stderr = 0;
  53 char *remotecmd = NULL;
  54 char *comm = NULL;
  55 char *hostname = NULL;
  56 char *outputfile = NULL;
  57 char *host_shortname = NULL;
  58 char **service;
  59 int passive = FALSE;
  60 int verbose = FALSE;
  61
  62 int
  63 main (int argc, char **argv)
  64 {
  65
  66         char *status_text;
  67         int cresult;
  68         int result = STATE_UNKNOWN;
  69         int i;
  70         time_t local_time;
  71         FILE *fp = NULL;
  72         struct output chld_out, chld_err;
  73
  74         remotecmd = "";
  75         comm = strdup (SSH_COMMAND);
  76
  77         setlocale (LC_ALL, "");
  78         bindtextdomain (PACKAGE, LOCALEDIR);
  79         textdomain (PACKAGE);
  80
  81         /* process arguments */
  82         if (process_arguments (argc, argv) == ERROR)
  83                 usage_va(_("Could not parse arguments"));
  84
  85         /* Set signal handling and alarm timeout */
  86         if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
  87                 usage_va(_("Cannot catch SIGALRM"));
  88         }
  89         alarm (timeout_interval);
  90
  91         /* run the command */
  92         if (verbose)
  93                 printf ("%s\n", comm);
  94
  95         result = np_runcmd(comm, &chld_out, &chld_err, 0);
  96
  97         if (skip_stdout == -1) /* --skip-stdout specified without argument */
  98                 skip_stdout = chld_out.lines;
  99         if (skip_stderr == -1) /* --skip-stderr specified without argument */
 100                 skip_stderr = chld_err.lines;
 101
 102         /* UNKNOWN if (non-skipped) output found on stderr */
 103         if(chld_err.lines > skip_stderr) {
 104                 printf (_("Remote command execution failed: %s\n"),
 105                         chld_err.line[skip_stderr]);
 106                 return STATE_UNKNOWN;
 107         }
 108
 109         /* this is simple if we're not supposed to be passive.
 110          * Wrap up quickly and keep the tricks below */
 111         if(!passive) {
 112                 if (chld_out.lines > skip_stdout)
 113                         puts (chld_out.line[skip_stdout]);
 114                 else
 115                         printf (_("%s - check_by_ssh: Remote command '%s' returned status %d\n"),
 116                                 state_text(result), remotecmd, result);
 117                 return result;  /* return error status from remote command */
 118         }
 119
 120
 121         /*
 122          * Passive mode
 123          */
 124
 125         /* process output */
 126         if (!(fp = fopen (outputfile, "a"))) {
 127                 printf (_("SSH WARNING: could not open %s\n"), outputfile);
 128                 exit (STATE_UNKNOWN);
 129         }
 130
 131         local_time = time (NULL);
 132         commands = 0;
 133         for(i = skip_stdout; i < chld_out.lines; i++) {
 134                 status_text = strstr (chld_out.line[i], "STATUS CODE: ");
 135                 if (status_text == NULL) {
 136                         printf ("%s", chld_out.line[i]);
 137                         return result;
 138                 }
 139                 if (service[commands] && status_text
 140                         && sscanf (status_text, "STATUS CODE: %d", &cresult) == 1)
 141                 {
 142                         fprintf (fp, "[%d] PROCESS_SERVICE_CHECK_RESULT;%s;%s;%d;%s\n",
 143                                  (int) local_time, host_shortname, service[commands++],
 144                                  cresult, chld_out.line[i]);
 145                 }
 146         }
 147
 148         /* force an OK state */
 149         return result;
 150 }
 151
 152 /* process command-line arguments */
 153 int
 154 process_arguments (int argc, char **argv)
 155 {
 156         int c;
 157         char *p1, *p2;
 158
 159         int option = 0;
 160         static struct option longopts[] = {
 161                 {"version", no_argument, 0, 'V'},
 162                 {"help", no_argument, 0, 'h'},
 163                 {"verbose", no_argument, 0, 'v'},
 164                 {"fork", no_argument, 0, 'f'},
 165                 {"timeout", required_argument, 0, 't'},
 166                 {"host", required_argument, 0, 'H'},
 167                 {"port", required_argument,0,'p'},
 168                 {"output", required_argument, 0, 'O'},
 169                 {"name", required_argument, 0, 'n'},
 170                 {"services", required_argument, 0, 's'},
 171                 {"identity", required_argument, 0, 'i'},
 172                 {"user", required_argument, 0, 'u'},
 173                 {"logname", required_argument, 0, 'l'},
 174                 {"command", required_argument, 0, 'C'},
 175                 {"skip", optional_argument, 0, 'S'}, /* backwards compatibility */
 176                 {"skip-stdout", optional_argument, 0, 'S'},
 177                 {"skip-stderr", optional_argument, 0, 'E'},
 178                 {"proto1", no_argument, 0, '1'},
 179                 {"proto2", no_argument, 0, '2'},
 180                 {"use-ipv4", no_argument, 0, '4'},
 181                 {"use-ipv6", no_argument, 0, '6'},
 182                 {"ssh-option", required_argument, 0, 'o'},
 183                 {"quiet", no_argument, 0, 'q'},
 184                 {0, 0, 0, 0}
 185         };
 186
 187         if (argc < 2)
 188                 return ERROR;
 189
 190         for (c = 1; c < argc; c++)
 191                 if (strcmp ("-to", argv[c]) == 0)
 192                         strcpy (argv[c], "-t");
 193
 194         while (1) {
 195                 c = getopt_long (argc, argv, "Vvh1246fqt:H:O:p:i:u:l:C:S::E::n:s:o:", longopts,
 196                                  &option);
 197
 198                 if (c == -1 || c == EOF)
 199                         break;
 200
 201                 switch (c) {
 202                 case 'V':                                                                       /* version */
 203                         print_revision (progname, revision);
 204                         exit (STATE_OK);
 205                 case 'h':                                                                       /* help */
 206                         print_help ();
 207                         exit (STATE_OK);
 208                 case 'v':                                                                       /* help */
 209                         verbose = TRUE;
 210                         break;
 211                 case 't':                                                                       /* timeout period */
 212                         if (!is_integer (optarg))
 213                                 usage_va(_("Timeout interval must be a positive integer"));
 214                         else
 215                                 timeout_interval = atoi (optarg);
 216                         break;
 217                 case 'H':                                                                       /* host */
 218                         host_or_die(optarg);
 219                         hostname = optarg;
 220                         break;
 221                 case 'p': /* port number */
 222                         if (!is_integer (optarg))
 223                                 usage_va(_("Port must be a positive integer"));
 224                         asprintf (&comm,"%s -p %s", comm, optarg);
 225                         break;
 226                 case 'O':                                                                       /* output file */
 227                         outputfile = optarg;
 228                         passive = TRUE;
 229                         break;
 230                 case 's':                                                                       /* description of service to check */
 231                         p1 = optarg;
 232                         service = realloc (service, (++services) * sizeof(char *));
 233                         while ((p2 = index (p1, ':'))) {
 234                                 *p2 = '\0';
 235                                 service[services - 1] = p1;
 236                                 service = realloc (service, (++services) * sizeof(char *));
 237                                 p1 = p2 + 1;
 238                         }
 239                         service[services - 1] = p1;
 240                         break;
 241                 case 'n':                                                                       /* short name of host in nagios configuration */
 242                         host_shortname = optarg;
 243                         break;
 244
 245                 case 'u':
 246                         c = 'l';
 247                 case 'l':                                                                       /* login name */
 248                 case 'i':                                                                       /* identity */
 249                         asprintf (&comm, "%s -%c %s", comm, c, optarg);
 250                         break;
 251
 252                 case '1':                                                                       /* Pass these switches directly to ssh */
 253                 case '2':                                                                       /* 1 to force version 1, 2 to force version 2 */
 254                 case '4':                                                                       /* -4 for IPv4 */
 255                 case '6':                                                               /* -6 for IPv6 */
 256                 case 'f':                                                                       /* fork to background */
 257                         asprintf (&comm, "%s -%c", comm, c);
 258                         break;
 259                 case 'C':                                                                       /* Command for remote machine */
 260                         commands++;
 261                         if (commands > 1)
 262                                 asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
 263                         asprintf (&remotecmd, "%s%s", remotecmd, optarg);
 264                         break;
 265                 case 'S':                                                                       /* skip n (or all) lines on stdout */
 266                         if (optarg == NULL)
 267                                 skip_stdout = -1; /* skip all output on stdout */
 268                         else if (!is_integer (optarg))
 269                                 usage_va(_("skip-stdout argument must be an integer"));
 270                         else
 271                                 skip_stdout = atoi (optarg);
 272                         break;
 273                 case 'E':                                                                       /* skip n (or all) lines on stderr */
 274                         if (optarg == NULL)
 275                                 skip_stderr = -1; /* skip all output on stderr */
 276                         else if (!is_integer (optarg))
 277                                 usage_va(_("skip-stderr argument must be an integer"));
 278                         else
 279                                 skip_stderr = atoi (optarg);
 280                         break;
 281                 case 'o':                                                                       /* Extra options for the ssh command */
 282                         asprintf (&comm, "%s -%c '%s'", comm, c, optarg);
 283                         break;
 284                 case 'q':                                                                       /* Tell the ssh command to be quiet */
 285                         asprintf (&comm, "%s -%c", comm, c);
 286                         break;
 287                 default:                                                                        /* help */
 288                         usage5();
 289                 }
 290         }
 291
 292         c = optind;
 293         if (hostname == NULL) {
 294                 if (c <= argc) {
 295                         die (STATE_UNKNOWN, _("%s: You must provide a host name\n"), progname);
 296                 }
 297                 host_or_die(argv[c]);
 298                 hostname = argv[c++];
 299         }
 300
 301         if (strlen(remotecmd) == 0) {
 302                 for (; c < argc; c++)
 303                         if (strlen(remotecmd) > 0)
 304                                 asprintf (&remotecmd, "%s %s", remotecmd, argv[c]);
 305                         else
 306                                 asprintf (&remotecmd, "%s", argv[c]);
 307         }
 308
 309         if (commands > 1)
 310                 asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
 311
 312         if (remotecmd == NULL || strlen (remotecmd) <= 1)
 313                 usage_va(_("No remotecmd"));
 314
 315         asprintf (&comm, "%s %s '%s'", comm, hostname, remotecmd);
 316
 317         return validate_arguments ();
 318 }
 319
 320
 321
 322 int
 323 validate_arguments (void)
 324 {
 325         if (remotecmd == NULL || hostname == NULL)
 326                 return ERROR;
 327
 328         if (passive && commands != services)
 329                 die (STATE_UNKNOWN, _("%s: In passive mode, you must provide a service name for each command.\n"), progname);
 330
 331         if (passive && host_shortname == NULL)
 332                 die (STATE_UNKNOWN, _("%s: In passive mode, you must provide the host short name from the nagios configs.\n"), progname);
 333
 334         return OK;
 335 }
 336
 337
 338 void
 339 print_help (void)
 340 {
 341         print_revision (progname, revision);
 342
 343         printf ("Copyright (c) 1999 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
 344         printf (COPYRIGHT, copyright, email);
 345
 346         printf (_("This plugin uses SSH to execute commands on a remote host"));
 347
 348   printf ("\n\n");
 349
 350         print_usage ();
 351
 352         printf (_(UT_HELP_VRSN));
 353
 354         printf (_(UT_HOST_PORT), 'p', "none");
 355
 356         printf (_(UT_IPv46));
 357
 358   printf (" %s\n", "-1, --proto1");
 359   printf ("    %s\n", _("tell ssh to use Protocol 1 [optional]"));
 360   printf (" %s\n", "-2, --proto2");
 361   printf ("    %s\n", _("tell ssh to use Protocol 2 [optional]"));
 362   printf (" %s\n", "-S, --skip-stdout[=n]");
 363   printf ("    %s\n", _("Ignore all or (if specified) first n lines on STDOUT [optional]"));
 364   printf (" %s\n", "-E, --skip-stderr[=n]");
 365   printf ("    %s\n", _("Ignore all or (if specified) first n lines on STDERR [optional]"));
 366   printf (" %s\n", "-f");
 367   printf ("    %s\n", _("tells ssh to fork rather than create a tty [optional]"));
 368   printf (" %s\n","-C, --command='COMMAND STRING'");
 369   printf ("    %s\n", _("command to execute on the remote machine"));
 370   printf (" %s\n","-l, --logname=USERNAME");
 371   printf ("    %s\n", _("SSH user name on remote host [optional]"));
 372   printf (" %s\n","-i, --identity=KEYFILE");
 373   printf ("    %s\n", _("identity of an authorized key [optional]"));
 374   printf (" %s\n","-O, --output=FILE");
 375   printf ("    %s\n", _("external command file for nagios [optional]"));
 376   printf (" %s\n","-s, --services=LIST");
 377   printf ("    %s\n", _("list of nagios service names, separated by ':' [optional]"));
 378   printf (" %s\n","-n, --name=NAME");
 379   printf ("    %s\n", _("short name of host in nagios configuration [optional]"));
 380   printf (" %s\n","-o, --ssh-option=OPTION");
 381   printf ("    %s\n", _("Call ssh with '-o OPTION' (may be used multiple times) [optional]"));
 382   printf (" %s\n","-q, --quiet");
 383   printf ("    %s\n", _("Tell ssh to suppress warning and diagnostic messages [optional]"));
 384         printf (_(UT_WARN_CRIT));
 385         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 386   printf (" %s\n", _("The most common mode of use is to refer to a local identity file with"));
 387   printf (" %s\n", _("the '-i' option. In this mode, the identity pair should have a null"));
 388   printf (" %s\n", _("passphrase and the public key should be listed in the authorized_keys"));
 389   printf (" %s\n", _("file of the remote host. Usually the key will be restricted to running"));
 390   printf (" %s\n", _("only one command on the remote server. If the remote SSH server tracks"));
 391   printf (" %s\n", _("invocation arguments, the one remote program may be an agent that can"));
 392   printf (" %s\n", _("execute additional commands as proxy"));
 393   printf (" %s\n", _("To use passive mode, provide multiple '-C' options, and provide"));
 394   printf (" %s\n", _("all of -O, -s, and -n options (servicelist order must match '-C'options)"));
 395   printf ("\n");
 396   printf ("%s\n", _("Examples:"));
 397   printf (" %s\n", "$ check_by_ssh -H localhost -n lh -s c1:c2:c3 -C uptime -C uptime -C uptime -O /tmp/foo");
 398   printf (" %s\n", "$ cat /tmp/foo");
 399   printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c1;0; up 2 days");
 400   printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c2;0; up 2 days");
 401   printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c3;0; up 2 days");
 402         printf (_(UT_SUPPORT));
 403 }
 404
 405
 406
 407 void
 408 print_usage (void)
 409 {
 410         printf (_("Usage:"));
 411         printf (" %s -H <host> -C <command> [-fq] [-1|-2] [-4|-6]\n"
 412                 "       [-S [lines]] [-E [lines]] [-t timeout] [-i identity]\n"
 413                 "       [-l user] [-n name] [-s servicelist] [-O outputfile]\n"
 414                 "       [-p port] [-o ssh-option]\n",
 415                 progname);
 416 }