plugins/check_ntp_peer.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_ntp_peer plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2006 Sean Finney <seanius@seanius.net>
   7 * Copyright (c) 2006-2008 Nagios Plugins Development Team
   8 *
   9 * Description:
  10 *
  11 * This file contains the check_ntp_peer plugin
  12 *
  13 * This plugin checks an NTP server independent of any commandline
  14 * programs or external libraries.
  15 *
  16 * Use this plugin to check the health of an NTP server. It supports
  17 * checking the offset with the sync peer, the jitter and stratum. This
  18 * plugin will not check the clock offset between the local host and NTP
  19 * server; please use check_ntp_time for that purpose.
  20 *
  21 *
  22 * This program is free software: you can redistribute it and/or modify
  23 * it under the terms of the GNU General Public License as published by
  24 * the Free Software Foundation, either version 3 of the License, or
  25 * (at your option) any later version.
  26 *
  27 * This program is distributed in the hope that it will be useful,
  28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30 * GNU General Public License for more details.
  31 *
  32 * You should have received a copy of the GNU General Public License
  33 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  34 *
  35 *
  36 *****************************************************************************/
  37
  38 const char *progname = "check_ntp_peer";
  39 const char *copyright = "2006-2008";
  40 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  41
  42 #include "common.h"
  43 #include "netutils.h"
  44 #include "utils.h"
  45
  46 static char *server_address=NULL;
  47 static int port=123;
  48 static int verbose=0;
  49 static int quiet=0;
  50 static short do_offset=0;
  51 static char *owarn="60";
  52 static char *ocrit="120";
  53 static short do_stratum=0;
  54 static char *swarn="-1:16";
  55 static char *scrit="-1:16";
  56 static short do_jitter=0;
  57 static char *jwarn="-1:5000";
  58 static char *jcrit="-1:10000";
  59 static short do_truechimers=0;
  60 static char *twarn="0:";
  61 static char *tcrit="0:";
  62 static int syncsource_found=0;
  63 static int li_alarm=0;
  64
  65 int process_arguments (int, char **);
  66 thresholds *offset_thresholds = NULL;
  67 thresholds *jitter_thresholds = NULL;
  68 thresholds *stratum_thresholds = NULL;
  69 thresholds *truechimer_thresholds = NULL;
  70 void print_help (void);
  71 void print_usage (void);
  72
  73 /* max size of control message data */
  74 #define MAX_CM_SIZE 468
  75
  76 /* this structure holds everything in an ntp control message as per rfc1305 */
  77 typedef struct {
  78         uint8_t flags;       /* byte with leapindicator,vers,mode. see macros */
  79         uint8_t op;          /* R,E,M bits and Opcode */
  80         uint16_t seq;        /* Packet sequence */
  81         uint16_t status;     /* Clock status */
  82         uint16_t assoc;      /* Association */
  83         uint16_t offset;     /* Similar to TCP sequence # */
  84         uint16_t count;      /* # bytes of data */
  85         char data[MAX_CM_SIZE]; /* ASCII data of the request */
  86                                 /* NB: not necessarily NULL terminated! */
  87 } ntp_control_message;
  88
  89 /* this is an association/status-word pair found in control packet reponses */
  90 typedef struct {
  91         uint16_t assoc;
  92         uint16_t status;
  93 } ntp_assoc_status_pair;
  94
  95 /* bits 1,2 are the leap indicator */
  96 #define LI_MASK 0xc0
  97 #define LI(x) ((x&LI_MASK)>>6)
  98 #define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
  99 /* and these are the values of the leap indicator */
 100 #define LI_NOWARNING 0x00
 101 #define LI_EXTRASEC 0x01
 102 #define LI_MISSINGSEC 0x02
 103 #define LI_ALARM 0x03
 104 /* bits 3,4,5 are the ntp version */
 105 #define VN_MASK 0x38
 106 #define VN(x)   ((x&VN_MASK)>>3)
 107 #define VN_SET(x,y)     do{ x |= ((y<<3)&VN_MASK); }while(0)
 108 #define VN_RESERVED 0x02
 109 /* bits 6,7,8 are the ntp mode */
 110 #define MODE_MASK 0x07
 111 #define MODE(x) (x&MODE_MASK)
 112 #define MODE_SET(x,y)   do{ x |= (y&MODE_MASK); }while(0)
 113 /* here are some values */
 114 #define MODE_CLIENT 0x03
 115 #define MODE_CONTROLMSG 0x06
 116 /* In control message, bits 8-10 are R,E,M bits */
 117 #define REM_MASK 0xe0
 118 #define REM_RESP 0x80
 119 #define REM_ERROR 0x40
 120 #define REM_MORE 0x20
 121 /* In control message, bits 11 - 15 are opcode */
 122 #define OP_MASK 0x1f
 123 #define OP_SET(x,y)   do{ x |= (y&OP_MASK); }while(0)
 124 #define OP_READSTAT 0x01
 125 #define OP_READVAR  0x02
 126 /* In peer status bytes, bits 6,7,8 determine clock selection status */
 127 #define PEER_SEL(x) ((ntohs(x)>>8)&0x07)
 128 #define PEER_TRUECHIMER 0x02
 129 #define PEER_INCLUDED 0x04
 130 #define PEER_SYNCSOURCE 0x06
 131
 132 /* NTP control message header is 12 bytes, plus any data in the data
 133  * field, plus null padding to the nearest 32-bit boundary per rfc.
 134  */
 135 #define SIZEOF_NTPCM(m) (12+ntohs(m.count)+((ntohs(m.count)%4)?4-(ntohs(m.count)%4):0))
 136
 137 /* finally, a little helper or two for debugging: */
 138 #define DBG(x) do{if(verbose>1){ x; }}while(0);
 139 #define PRINTSOCKADDR(x) \
 140         do{ \
 141                 printf("%u.%u.%u.%u", (x>>24)&0xff, (x>>16)&0xff, (x>>8)&0xff, x&0xff);\
 142         }while(0);
 143
 144 void print_ntp_control_message(const ntp_control_message *p){
 145         int i=0, numpeers=0;
 146         const ntp_assoc_status_pair *peer=NULL;
 147
 148         printf("control packet contents:\n");
 149         printf("\tflags: 0x%.2x , 0x%.2x\n", p->flags, p->op);
 150         printf("\t  li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
 151         printf("\t  vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
 152         printf("\t  mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
 153         printf("\t  response=%d (0x%.2x)\n", (p->op&REM_RESP)>0, p->op&REM_RESP);
 154         printf("\t  more=%d (0x%.2x)\n", (p->op&REM_MORE)>0, p->op&REM_MORE);
 155         printf("\t  error=%d (0x%.2x)\n", (p->op&REM_ERROR)>0, p->op&REM_ERROR);
 156         printf("\t  op=%d (0x%.2x)\n", p->op&OP_MASK, p->op&OP_MASK);
 157         printf("\tsequence: %d (0x%.2x)\n", ntohs(p->seq), ntohs(p->seq));
 158         printf("\tstatus: %d (0x%.2x)\n", ntohs(p->status), ntohs(p->status));
 159         printf("\tassoc: %d (0x%.2x)\n", ntohs(p->assoc), ntohs(p->assoc));
 160         printf("\toffset: %d (0x%.2x)\n", ntohs(p->offset), ntohs(p->offset));
 161         printf("\tcount: %d (0x%.2x)\n", ntohs(p->count), ntohs(p->count));
 162         numpeers=ntohs(p->count)/(sizeof(ntp_assoc_status_pair));
 163         if(p->op&REM_RESP && p->op&OP_READSTAT){
 164                 peer=(ntp_assoc_status_pair*)p->data;
 165                 for(i=0;i<numpeers;i++){
 166                         printf("\tpeer id %.2x status %.2x",
 167                                ntohs(peer[i].assoc), ntohs(peer[i].status));
 168                         if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
 169                                 printf(" <-- current sync source");
 170                         } else if(PEER_SEL(peer[i].status) >= PEER_INCLUDED){
 171                                 printf(" <-- current sync candidate");
 172                         } else if(PEER_SEL(peer[i].status) >= PEER_TRUECHIMER){
 173                                 printf(" <-- outlyer, but truechimer");
 174                         }
 175                         printf("\n");
 176                 }
 177         }
 178 }
 179
 180 void
 181 setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
 182         memset(p, 0, sizeof(ntp_control_message));
 183         LI_SET(p->flags, LI_NOWARNING);
 184         VN_SET(p->flags, VN_RESERVED);
 185         MODE_SET(p->flags, MODE_CONTROLMSG);
 186         OP_SET(p->op, opcode);
 187         p->seq = htons(seq);
 188         /* Remaining fields are zero for requests */
 189 }
 190
 191 /* This function does all the actual work; roughly here's what it does
 192  * beside setting the offest, jitter and stratum passed as argument:
 193  *  - offset can be negative, so if it cannot get the offset, offset_result
 194  *    is set to UNKNOWN, otherwise OK.
 195  *  - jitter and stratum are set to -1 if they cannot be retrieved so any
 196  *    positive value means a success retrieving the value.
 197  *  - status is set to WARNING if there's no sync.peer (otherwise OK) and is
 198  *    the return value of the function.
 199  *  status is pretty much useless as syncsource_found is a global variable
 200  *  used later in main to check is the server was synchronized. It works
 201  *  so I left it alone */
 202 int ntp_request(const char *host, double *offset, int *offset_result, double *jitter, int *stratum, int *num_truechimers){
 203         int conn=-1, i, npeers=0, num_candidates=0;
 204         double tmp_offset = 0;
 205         int min_peer_sel=PEER_INCLUDED;
 206         int peers_size=0, peer_offset=0;
 207         int status;
 208         ntp_assoc_status_pair *peers=NULL;
 209         ntp_control_message req;
 210         const char *getvar = "stratum,offset,jitter";
 211         char *data, *value, *nptr;
 212         void *tmp;
 213
 214         status = STATE_OK;
 215         *offset_result = STATE_UNKNOWN;
 216         *jitter = *stratum = -1;
 217         *num_truechimers = 0;
 218
 219         /* Long-winded explanation:
 220          * Getting the sync peer offset, jitter and stratum requires a number of
 221          * steps:
 222          * 1) Send a READSTAT request.
 223          * 2) Interpret the READSTAT reply
 224          *  a) The data section contains a list of peer identifiers (16 bits)
 225          *     and associated status words (16 bits)
 226          *  b) We want the value of 0x06 in the SEL (peer selection) value,
 227          *     which means "current synchronizatin source".  If that's missing,
 228          *     we take anything better than 0x04 (see the rfc for details) but
 229          *     set a minimum of warning.
 230          * 3) Send a READVAR request for information on each peer identified
 231          *    in 2b greater than the minimum selection value.
 232          * 4) Extract the offset, jitter and stratum value from the data[]
 233          *    (it's ASCII)
 234          */
 235         my_udp_connect(server_address, port, &conn);
 236
 237         /* keep sending requests until the server stops setting the
 238          * REM_MORE bit, though usually this is only 1 packet. */
 239         do{
 240                 setup_control_request(&req, OP_READSTAT, 1);
 241                 DBG(printf("sending READSTAT request"));
 242                 write(conn, &req, SIZEOF_NTPCM(req));
 243                 DBG(print_ntp_control_message(&req));
 244                 /* Attempt to read the largest size packet possible */
 245                 req.count=htons(MAX_CM_SIZE);
 246                 DBG(printf("recieving READSTAT response"))
 247                 if(read(conn, &req, SIZEOF_NTPCM(req)) == -1)
 248                         die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
 249                 DBG(print_ntp_control_message(&req));
 250                 /* discard obviously invalid packets */
 251                 if (ntohs(req.count) > MAX_CM_SIZE)
 252                         die(STATE_CRITICAL, "NTP CRITICAL: Invalid packet received from NTP server\n");
 253                 if (LI(req.flags) == LI_ALARM) li_alarm = 1;
 254                 /* Each peer identifier is 4 bytes in the data section, which
 255                  * we represent as a ntp_assoc_status_pair datatype.
 256                  */
 257                 peers_size+=ntohs(req.count);
 258                 if((tmp=realloc(peers, peers_size)) == NULL)
 259                         free(peers), die(STATE_UNKNOWN, "can not (re)allocate 'peers' buffer\n");
 260                 peers=tmp;
 261                 memcpy((void*)((ptrdiff_t)peers+peer_offset), (void*)req.data, ntohs(req.count));
 262                 npeers=peers_size/sizeof(ntp_assoc_status_pair);
 263                 peer_offset+=ntohs(req.count);
 264         } while(req.op&REM_MORE);
 265
 266         /* first, let's find out if we have a sync source, or if there are
 267          * at least some candidates. In the latter case we'll issue
 268          * a warning but go ahead with the check on them. */
 269         for (i = 0; i < npeers; i++){
 270                 if(PEER_SEL(peers[i].status) >= PEER_TRUECHIMER){
 271                         (*num_truechimers)++;
 272                         if(PEER_SEL(peers[i].status) >= PEER_INCLUDED){
 273                                 num_candidates++;
 274                                 if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
 275                                         syncsource_found=1;
 276                                         min_peer_sel=PEER_SYNCSOURCE;
 277                                 }
 278                         }
 279                 }
 280         }
 281         if(verbose) printf("%d candidate peers available\n", num_candidates);
 282         if(verbose && syncsource_found) printf("synchronization source found\n");
 283         if(! syncsource_found){
 284                 status = STATE_WARNING;
 285                 if(verbose) printf("warning: no synchronization source found\n");
 286         }
 287         if(li_alarm){
 288                 status = STATE_WARNING;
 289                 if(verbose) printf("warning: LI_ALARM bit is set\n");
 290         }
 291
 292
 293         for (i = 0; i < npeers; i++){
 294                 /* Only query this server if it is the current sync source */
 295                 /* If there's no sync.peer, query all candidates and use the best one */
 296                 if (PEER_SEL(peers[i].status) >= min_peer_sel){
 297                         if(verbose) printf("Getting offset, jitter and stratum for peer %.2x\n", ntohs(peers[i].assoc));
 298                         asprintf(&data, "");
 299                         do{
 300                                 setup_control_request(&req, OP_READVAR, 2);
 301                                 req.assoc = peers[i].assoc;
 302                                 /* Putting the wanted variable names in the request
 303                                  * cause the server to provide _only_ the requested values.
 304                                  * thus reducing net traffic, guaranteeing us only a single
 305                                  * datagram in reply, and making intepretation much simpler
 306                                  */
 307                                 /* Older servers doesn't know what jitter is, so if we get an
 308                                  * error on the first pass we redo it with "dispersion" */
 309                                 strncpy(req.data, getvar, MAX_CM_SIZE-1);
 310                                 req.count = htons(strlen(getvar));
 311                                 DBG(printf("sending READVAR request...\n"));
 312                                 write(conn, &req, SIZEOF_NTPCM(req));
 313                                 DBG(print_ntp_control_message(&req));
 314
 315                                 req.count = htons(MAX_CM_SIZE);
 316                                 DBG(printf("receiving READVAR response...\n"));
 317                                 read(conn, &req, SIZEOF_NTPCM(req));
 318                                 DBG(print_ntp_control_message(&req));
 319
 320                                 if(!(req.op&REM_ERROR))
 321                                         asprintf(&data, "%s%s", data, req.data);
 322                         } while(req.op&REM_MORE);
 323
 324                         if(req.op&REM_ERROR) {
 325                                 if(strstr(getvar, "jitter")) {
 326                                         if(verbose) printf("The command failed. This is usually caused by servers refusing the 'jitter'\nvariable. Restarting with 'dispersion'...\n");
 327                                         getvar = "stratum,offset,dispersion";
 328                                         i--;
 329                                         continue;
 330                                 } else if(strlen(getvar)) {
 331                                         if(verbose) printf("Server didn't like dispersion either; will retrieve everything\n");
 332                                         getvar = "";
 333                                         i--;
 334                                         continue;
 335                                 }
 336                         }
 337
 338                         if(verbose > 1)
 339                                 printf("Server responded: >>>%s<<<\n", data);
 340
 341                         /* get the offset */
 342                         if(verbose)
 343                                 printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));
 344
 345                         value = np_extract_ntpvar(data, "offset");
 346                         nptr=NULL;
 347                         /* Convert the value if we have one */
 348                         if(value != NULL)
 349                                 tmp_offset = strtod(value, &nptr) / 1000;
 350                         /* If value is null or no conversion was performed */
 351                         if(value == NULL || value==nptr) {
 352                                 if(verbose) printf("error: unable to read server offset response.\n");
 353                         } else {
 354                                 if(verbose) printf("%.10g\n", tmp_offset);
 355                                 if(*offset_result == STATE_UNKNOWN || fabs(tmp_offset) < fabs(*offset)) {
 356                                         *offset = tmp_offset;
 357                                         *offset_result = STATE_OK;
 358                                 } else {
 359                                         /* Skip this one; move to the next */
 360                                         continue;
 361                                 }
 362                         }
 363
 364                         if(do_jitter) {
 365                                 /* get the jitter */
 366                                 if(verbose) {
 367                                         printf("parsing %s from peer %.2x: ", strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter", ntohs(peers[i].assoc));
 368                                 }
 369                                 value = np_extract_ntpvar(data, strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter");
 370                                 nptr=NULL;
 371                                 /* Convert the value if we have one */
 372                                 if(value != NULL)
 373                                         *jitter = strtod(value, &nptr);
 374                                 /* If value is null or no conversion was performed */
 375                                 if(value == NULL || value==nptr) {
 376                                         if(verbose) printf("error: unable to read server jitter/dispersion response.\n");
 377                                         *jitter = -1;
 378                                 } else if(verbose) {
 379                                         printf("%.10g\n", *jitter);
 380                                 }
 381                         }
 382
 383                         if(do_stratum) {
 384                                 /* get the stratum */
 385                                 if(verbose) {
 386                                         printf("parsing stratum from peer %.2x: ", ntohs(peers[i].assoc));
 387                                 }
 388                                 value = np_extract_ntpvar(data, "stratum");
 389                                 nptr=NULL;
 390                                 /* Convert the value if we have one */
 391                                 if(value != NULL)
 392                                         *stratum = strtol(value, &nptr, 10);
 393                                 if(value == NULL || value==nptr) {
 394                                         if(verbose) printf("error: unable to read server stratum response.\n");
 395                                         *stratum = -1;
 396                                 } else {
 397                                         if(verbose) printf("%i\n", *stratum);
 398                                 }
 399                         }
 400                 } /* if (PEER_SEL(peers[i].status) >= min_peer_sel) */
 401         } /* for (i = 0; i < npeers; i++) */
 402
 403         close(conn);
 404         if(peers!=NULL) free(peers);
 405
 406         return status;
 407 }
 408
 409 int process_arguments(int argc, char **argv){
 410         int c;
 411         int option=0;
 412         static struct option longopts[] = {
 413                 {"version", no_argument, 0, 'V'},
 414                 {"help", no_argument, 0, 'h'},
 415                 {"verbose", no_argument, 0, 'v'},
 416                 {"use-ipv4", no_argument, 0, '4'},
 417                 {"use-ipv6", no_argument, 0, '6'},
 418                 {"quiet", no_argument, 0, 'q'},
 419                 {"warning", required_argument, 0, 'w'},
 420                 {"critical", required_argument, 0, 'c'},
 421                 {"swarn", required_argument, 0, 'W'},
 422                 {"scrit", required_argument, 0, 'C'},
 423                 {"jwarn", required_argument, 0, 'j'},
 424                 {"jcrit", required_argument, 0, 'k'},
 425                 {"twarn", required_argument, 0, 'm'},
 426                 {"tcrit", required_argument, 0, 'n'},
 427                 {"timeout", required_argument, 0, 't'},
 428                 {"hostname", required_argument, 0, 'H'},
 429                 {"port", required_argument, 0, 'p'},
 430                 {0, 0, 0, 0}
 431         };
 432
 433
 434         if (argc < 2)
 435                 usage ("\n");
 436
 437         while (1) {
 438                 c = getopt_long (argc, argv, "Vhv46qw:c:W:C:j:k:m:n:t:H:p:", longopts, &option);
 439                 if (c == -1 || c == EOF || c == 1)
 440                         break;
 441
 442                 switch (c) {
 443                 case 'h':
 444                         print_help();
 445                         exit(STATE_OK);
 446                         break;
 447                 case 'V':
 448                         print_revision(progname, NP_VERSION);
 449                         exit(STATE_OK);
 450                         break;
 451                 case 'v':
 452                         verbose++;
 453                         break;
 454                 case 'q':
 455                         quiet = 1;
 456                         break;
 457                 case 'w':
 458                         do_offset=1;
 459                         owarn = optarg;
 460                         break;
 461                 case 'c':
 462                         do_offset=1;
 463                         ocrit = optarg;
 464                         break;
 465                 case 'W':
 466                         do_stratum=1;
 467                         swarn = optarg;
 468                         break;
 469                 case 'C':
 470                         do_stratum=1;
 471                         scrit = optarg;
 472                         break;
 473                 case 'j':
 474                         do_jitter=1;
 475                         jwarn = optarg;
 476                         break;
 477                 case 'k':
 478                         do_jitter=1;
 479                         jcrit = optarg;
 480                         break;
 481                 case 'm':
 482                         do_truechimers=1;
 483                         twarn = optarg;
 484                         break;
 485                 case 'n':
 486                         do_truechimers=1;
 487                         tcrit = optarg;
 488                         break;
 489                 case 'H':
 490                         if(is_host(optarg) == FALSE)
 491                                 usage2(_("Invalid hostname/address"), optarg);
 492                         server_address = strdup(optarg);
 493                         break;
 494                 case 'p':
 495                         port=atoi(optarg);
 496                         break;
 497                 case 't':
 498                         socket_timeout=atoi(optarg);
 499                         break;
 500                 case '4':
 501                         address_family = AF_INET;
 502                         break;
 503                 case '6':
 504 #ifdef USE_IPV6
 505                         address_family = AF_INET6;
 506 #else
 507                         usage4 (_("IPv6 support not available"));
 508 #endif
 509                         break;
 510                 case '?':
 511                         /* print short usage statement if args not parsable */
 512                         usage5 ();
 513                         break;
 514                 }
 515         }
 516
 517         if(server_address == NULL){
 518                 usage4(_("Hostname was not supplied"));
 519         }
 520
 521         return 0;
 522 }
 523
 524 char *perfd_offset (double offset)
 525 {
 526         return fperfdata ("offset", offset, "s",
 527                 TRUE, offset_thresholds->warning->end,
 528                 TRUE, offset_thresholds->critical->end,
 529                 FALSE, 0, FALSE, 0);
 530 }
 531
 532 char *perfd_jitter (double jitter)
 533 {
 534         return fperfdata ("jitter", jitter, "",
 535                 do_jitter, jitter_thresholds->warning->end,
 536                 do_jitter, jitter_thresholds->critical->end,
 537                 TRUE, 0, FALSE, 0);
 538 }
 539
 540 char *perfd_stratum (int stratum)
 541 {
 542         return perfdata ("stratum", stratum, "",
 543                 do_stratum, (int)stratum_thresholds->warning->end,
 544                 do_stratum, (int)stratum_thresholds->critical->end,
 545                 TRUE, 0, TRUE, 16);
 546 }
 547
 548 char *perfd_truechimers (int num_truechimers)
 549 {
 550         return perfdata ("truechimers", num_truechimers, "",
 551                 do_truechimers, (int)truechimer_thresholds->warning->end,
 552                 do_truechimers, (int)truechimer_thresholds->critical->end,
 553                 TRUE, 0, FALSE, 0);
 554 }
 555
 556 int main(int argc, char *argv[]){
 557         int result, offset_result, stratum, num_truechimers;
 558         double offset=0, jitter=0;
 559         char *result_line, *perfdata_line;
 560
 561         setlocale (LC_ALL, "");
 562         bindtextdomain (PACKAGE, LOCALEDIR);
 563         textdomain (PACKAGE);
 564
 565         /* Parse extra opts if any */
 566         argv=np_extra_opts (&argc, argv, progname);
 567
 568         if (process_arguments (argc, argv) == ERROR)
 569                 usage4 (_("Could not parse arguments"));
 570
 571         set_thresholds(&offset_thresholds, owarn, ocrit);
 572         set_thresholds(&jitter_thresholds, jwarn, jcrit);
 573         set_thresholds(&stratum_thresholds, swarn, scrit);
 574         set_thresholds(&truechimer_thresholds, twarn, tcrit);
 575
 576         /* initialize alarm signal handling */
 577         signal (SIGALRM, socket_timeout_alarm_handler);
 578
 579         /* set socket timeout */
 580         alarm (socket_timeout);
 581
 582         /* This returns either OK or WARNING (See comment preceeding ntp_request) */
 583         result = ntp_request(server_address, &offset, &offset_result, &jitter, &stratum, &num_truechimers);
 584
 585         if(offset_result == STATE_UNKNOWN) {
 586                 /* if there's no sync peer (this overrides ntp_request output): */
 587                 result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
 588         } else {
 589                 /* Be quiet if there's no candidates either */
 590                 if (quiet == 1 && result == STATE_WARNING)
 591                         result = STATE_UNKNOWN;
 592                 result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));
 593         }
 594
 595         if(do_truechimers)
 596                 result = max_state_alt(result, get_status(num_truechimers, truechimer_thresholds));
 597
 598         if(do_stratum)
 599                 result = max_state_alt(result, get_status(stratum, stratum_thresholds));
 600
 601         if(do_jitter)
 602                 result = max_state_alt(result, get_status(jitter, jitter_thresholds));
 603
 604         switch (result) {
 605                 case STATE_CRITICAL :
 606                         asprintf(&result_line, _("NTP CRITICAL:"));
 607                         break;
 608                 case STATE_WARNING :
 609                         asprintf(&result_line, _("NTP WARNING:"));
 610                         break;
 611                 case STATE_OK :
 612                         asprintf(&result_line, _("NTP OK:"));
 613                         break;
 614                 default :
 615                         asprintf(&result_line, _("NTP UNKNOWN:"));
 616                         break;
 617         }
 618         if(!syncsource_found)
 619                 asprintf(&result_line, "%s %s,", result_line, _("Server not synchronized"));
 620         else if(li_alarm)
 621                 asprintf(&result_line, "%s %s,", result_line, _("Server has the LI_ALARM bit set"));
 622
 623         if(offset_result == STATE_UNKNOWN){
 624                 asprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
 625                 asprintf(&perfdata_line, "");
 626         } else {
 627                 asprintf(&result_line, "%s %s %.10g secs", result_line, _("Offset"), offset);
 628                 asprintf(&perfdata_line, "%s", perfd_offset(offset));
 629         }
 630         if (do_jitter) {
 631                 asprintf(&result_line, "%s, jitter=%f", result_line, jitter);
 632                 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
 633         }
 634         if (do_stratum) {
 635                 asprintf(&result_line, "%s, stratum=%i", result_line, stratum);
 636                 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
 637         }
 638         if (do_truechimers) {
 639                 asprintf(&result_line, "%s, truechimers=%i", result_line, num_truechimers);
 640                 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_truechimers(num_truechimers));
 641         }
 642         printf("%s|%s\n", result_line, perfdata_line);
 643
 644         if(server_address!=NULL) free(server_address);
 645         return result;
 646 }
 647
 648
 649
 650 void print_help(void){
 651         print_revision(progname, NP_VERSION);
 652
 653         printf ("Copyright (c) 2006 Sean Finney\n");
 654         printf (COPYRIGHT, copyright, email);
 655
 656         printf ("%s\n", _("This plugin checks the selected ntp server"));
 657
 658         printf ("\n\n");
 659
 660         print_usage();
 661         printf (UT_HELP_VRSN);
 662         printf (UT_EXTRA_OPTS);
 663         printf (UT_HOST_PORT, 'p', "123");
 664         printf (" %s\n", "-q, --quiet");
 665         printf ("    %s\n", _("Returns UNKNOWN instead of CRITICAL or WARNING if server isn't synchronized"));
 666         printf (" %s\n", "-w, --warning=THRESHOLD");
 667         printf ("    %s\n", _("Offset to result in warning status (seconds)"));
 668         printf (" %s\n", "-c, --critical=THRESHOLD");
 669         printf ("    %s\n", _("Offset to result in critical status (seconds)"));
 670         printf (" %s\n", "-W, --swarn=THRESHOLD");
 671         printf ("    %s\n", _("Warning threshold for stratum"));
 672         printf (" %s\n", "-C, --scrit=THRESHOLD");
 673         printf ("    %s\n", _("Critical threshold for stratum"));
 674         printf (" %s\n", "-j, --jwarn=THRESHOLD");
 675         printf ("    %s\n", _("Warning threshold for jitter"));
 676         printf (" %s\n", "-k, --jcrit=THRESHOLD");
 677         printf ("    %s\n", _("Critical threshold for jitter"));
 678         printf (" %s\n", "-m, --twarn=THRESHOLD");
 679         printf ("    %s\n", _("Warning threshold for number of usable time sources (\"truechimers\")"));
 680         printf (" %s\n", "-n, --tcrit=THRESHOLD");
 681         printf ("    %s\n", _("Critical threshold for number of usable time sources (\"truechimers\")"));
 682         printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 683         printf (UT_VERBOSE);
 684
 685         printf("\n");
 686         printf("%s\n", _("This plugin checks an NTP server independent of any commandline"));
 687         printf("%s\n\n", _("programs or external libraries."));
 688
 689         printf("%s\n", _("Notes:"));
 690         printf(" %s\n", _("Use this plugin to check the health of an NTP server. It supports"));
 691         printf(" %s\n", _("checking the offset with the sync peer, the jitter and stratum. This"));
 692         printf(" %s\n", _("plugin will not check the clock offset between the local host and NTP"));
 693         printf(" %s\n", _("server; please use check_ntp_time for that purpose."));
 694         printf("\n");
 695         printf(UT_THRESHOLDS_NOTES);
 696
 697         printf("\n");
 698         printf("%s\n", _("Examples:"));
 699         printf(" %s\n", _("Simple NTP server check:"));
 700         printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1"));
 701         printf("\n");
 702         printf(" %s\n", _("Check jitter too, avoiding critical notifications if jitter isn't available"));
 703         printf(" %s\n", _("(See Notes above for more details on thresholds formats):"));
 704         printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
 705         printf("\n");
 706         printf(" %s\n", _("Only check the number of usable time sources (\"truechimers\"):"));
 707         printf("  %s\n", ("./check_ntp_peer -H ntpserv -m :5 -n :3"));
 708         printf("\n");
 709         printf(" %s\n", _("Check only stratum:"));
 710         printf("  %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));
 711
 712         printf (UT_SUPPORT);
 713 }
 714
 715 void
 716 print_usage(void)
 717 {
 718         printf ("%s\n", _("Usage:"));
 719         printf(" %s -H <host> [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
 720         printf("       [-j <warn>] [-k <crit>] [-v verbose]\n");
 721 }