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