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