1 /******************************************************************************
2 *
3 * Nagios check_ntp_peer plugin
4 *
5 * License: GPL
6 * Copyright (c) 2006 sean finney <seanius@seanius.net>
7 * Copyright (c) 2007 nagios-plugins 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 * License Information:
25 *
26 * This program is free software; you can redistribute it and/or modify
27 * it under the terms of the GNU General Public License as published by
28 * the Free Software Foundation; either version 2 of the License, or
29 * (at your option) any later version.
30 *
31 * This program is distributed in the hope that it will be useful,
32 * but WITHOUT ANY WARRANTY; without even the implied warranty of
33 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
34 * GNU General Public License for more details.
35 *
36 * You should have received a copy of the GNU General Public License
37 * along with this program; if not, write to the Free Software
38 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
40 $Id$
42 *****************************************************************************/
44 const char *progname = "check_ntp_peer";
45 const char *revision = "$Revision$";
46 const char *copyright = "2007";
47 const char *email = "nagiosplug-devel@lists.sourceforge.net";
49 #include "common.h"
50 #include "netutils.h"
51 #include "utils.h"
53 static char *server_address=NULL;
54 static int verbose=0;
55 static int quiet=0;
56 static short do_offset=0;
57 static char *owarn="60";
58 static char *ocrit="120";
59 static short do_stratum=0;
60 static char *swarn="-1:16";
61 static char *scrit="-1:16";
62 static short do_jitter=0;
63 static char *jwarn="-1:5000";
64 static char *jcrit="-1:10000";
65 static int syncsource_found=0;
67 int process_arguments (int, char **);
68 thresholds *offset_thresholds = NULL;
69 thresholds *jitter_thresholds = NULL;
70 thresholds *stratum_thresholds = NULL;
71 void print_help (void);
72 void print_usage (void);
74 /* max size of control message data */
75 #define MAX_CM_SIZE 468
77 /* this structure holds everything in an ntp control message as per rfc1305 */
78 typedef struct {
79 uint8_t flags; /* byte with leapindicator,vers,mode. see macros */
80 uint8_t op; /* R,E,M bits and Opcode */
81 uint16_t seq; /* Packet sequence */
82 uint16_t status; /* Clock status */
83 uint16_t assoc; /* Association */
84 uint16_t offset; /* Similar to TCP sequence # */
85 uint16_t count; /* # bytes of data */
86 char data[MAX_CM_SIZE]; /* ASCII data of the request */
87 /* NB: not necessarily NULL terminated! */
88 } ntp_control_message;
90 /* this is an association/status-word pair found in control packet reponses */
91 typedef struct {
92 uint16_t assoc;
93 uint16_t status;
94 } ntp_assoc_status_pair;
96 /* bits 1,2 are the leap indicator */
97 #define LI_MASK 0xc0
98 #define LI(x) ((x&LI_MASK)>>6)
99 #define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
100 /* and these are the values of the leap indicator */
101 #define LI_NOWARNING 0x00
102 #define LI_EXTRASEC 0x01
103 #define LI_MISSINGSEC 0x02
104 #define LI_ALARM 0x03
105 /* bits 3,4,5 are the ntp version */
106 #define VN_MASK 0x38
107 #define VN(x) ((x&VN_MASK)>>3)
108 #define VN_SET(x,y) do{ x |= ((y<<3)&VN_MASK); }while(0)
109 #define VN_RESERVED 0x02
110 /* bits 6,7,8 are the ntp mode */
111 #define MODE_MASK 0x07
112 #define MODE(x) (x&MODE_MASK)
113 #define MODE_SET(x,y) do{ x |= (y&MODE_MASK); }while(0)
114 /* here are some values */
115 #define MODE_CLIENT 0x03
116 #define MODE_CONTROLMSG 0x06
117 /* In control message, bits 8-10 are R,E,M bits */
118 #define REM_MASK 0xe0
119 #define REM_RESP 0x80
120 #define REM_ERROR 0x40
121 #define REM_MORE 0x20
122 /* In control message, bits 11 - 15 are opcode */
123 #define OP_MASK 0x1f
124 #define OP_SET(x,y) do{ x |= (y&OP_MASK); }while(0)
125 #define OP_READSTAT 0x01
126 #define OP_READVAR 0x02
127 /* In peer status bytes, bits 6,7,8 determine clock selection status */
128 #define PEER_SEL(x) ((ntohs(x)>>8)&0x07)
129 #define PEER_INCLUDED 0x04
130 #define PEER_SYNCSOURCE 0x06
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)+((m.count)?4-(ntohs(m.count)%4):0))
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);
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;
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_INCLUDED){
169 if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
170 printf(" <-- current sync source");
171 } else {
172 printf(" <-- current sync candidate");
173 }
174 }
175 printf("\n");
176 }
177 }
178 }
180 char *extract_value(const char *varlist, const char *name){
181 char *tmpvarlist=NULL, *tmpkey=NULL, *value=NULL;
182 int last=0;
184 /* The following code require a non-empty varlist */
185 if(strlen(varlist) == 0)
186 return NULL;
188 tmpvarlist = strdup(varlist);
189 tmpkey = strtok(tmpvarlist, "=");
191 do {
192 if(strstr(tmpkey, name) != NULL) {
193 value = strtok(NULL, ",");
194 last = 1;
195 }
196 } while (last == 0 && (tmpkey = strtok(NULL, "=")));
198 return value;
199 }
201 void
202 setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
203 memset(p, 0, sizeof(ntp_control_message));
204 LI_SET(p->flags, LI_NOWARNING);
205 VN_SET(p->flags, VN_RESERVED);
206 MODE_SET(p->flags, MODE_CONTROLMSG);
207 OP_SET(p->op, opcode);
208 p->seq = htons(seq);
209 /* Remaining fields are zero for requests */
210 }
212 /* This function does all the actual work; roughly here's what it does
213 * beside setting the offest, jitter and stratum passed as argument:
214 * - offset can be negative, so if it cannot get the offset, offset_result
215 * is set to UNKNOWN, otherwise OK.
216 * - jitter and stratum are set to -1 if they cannot be retrieved so any
217 * positive value means a success retrieving the value.
218 * - status is set to WARNING if there's no sync.peer (otherwise OK) and is
219 * the return value of the function.
220 * status is pretty much useless as syncsource_found is a global variable
221 * used later in main to check is the server was synchronized. It works
222 * so I left it alone */
223 int ntp_request(const char *host, double *offset, int *offset_result, double *jitter, int *stratum){
224 int conn=-1, i, npeers=0, num_candidates=0;
225 double tmp_offset = 0;
226 int min_peer_sel=PEER_INCLUDED;
227 int peers_size=0, peer_offset=0;
228 int status;
229 ntp_assoc_status_pair *peers=NULL;
230 ntp_control_message req;
231 const char *getvar = "stratum,offset,jitter";
232 char *data, *value, *nptr;
233 void *tmp;
235 status = STATE_OK;
236 *offset_result = STATE_UNKNOWN;
237 *jitter = *stratum = -1;
239 /* Long-winded explanation:
240 * Getting the sync peer offset, jitter and stratum requires a number of
241 * steps:
242 * 1) Send a READSTAT request.
243 * 2) Interpret the READSTAT reply
244 * a) The data section contains a list of peer identifiers (16 bits)
245 * and associated status words (16 bits)
246 * b) We want the value of 0x06 in the SEL (peer selection) value,
247 * which means "current synchronizatin source". If that's missing,
248 * we take anything better than 0x04 (see the rfc for details) but
249 * set a minimum of warning.
250 * 3) Send a READVAR request for information on each peer identified
251 * in 2b greater than the minimum selection value.
252 * 4) Extract the offset, jitter and stratum value from the data[]
253 * (it's ASCII)
254 */
255 my_udp_connect(server_address, 123, &conn);
257 /* keep sending requests until the server stops setting the
258 * REM_MORE bit, though usually this is only 1 packet. */
259 do{
260 setup_control_request(&req, OP_READSTAT, 1);
261 DBG(printf("sending READSTAT request"));
262 write(conn, &req, SIZEOF_NTPCM(req));
263 DBG(print_ntp_control_message(&req));
264 /* Attempt to read the largest size packet possible */
265 req.count=htons(MAX_CM_SIZE);
266 DBG(printf("recieving READSTAT response"))
267 if(read(conn, &req, SIZEOF_NTPCM(req)) == -1)
268 die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
269 DBG(print_ntp_control_message(&req));
270 /* Each peer identifier is 4 bytes in the data section, which
271 * we represent as a ntp_assoc_status_pair datatype.
272 */
273 peers_size+=ntohs(req.count);
274 if((tmp=realloc(peers, peers_size)) == NULL)
275 free(peers), die(STATE_UNKNOWN, "can not (re)allocate 'peers' buffer\n");
276 peers=tmp;
277 memcpy((void*)((ptrdiff_t)peers+peer_offset), (void*)req.data, ntohs(req.count));
278 npeers=peers_size/sizeof(ntp_assoc_status_pair);
279 peer_offset+=ntohs(req.count);
280 } while(req.op&REM_MORE);
282 /* first, let's find out if we have a sync source, or if there are
283 * at least some candidates. In the latter case we'll issue
284 * a warning but go ahead with the check on them. */
285 for (i = 0; i < npeers; i++){
286 if (PEER_SEL(peers[i].status) >= PEER_INCLUDED){
287 num_candidates++;
288 if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
289 syncsource_found=1;
290 min_peer_sel=PEER_SYNCSOURCE;
291 }
292 }
293 }
294 if(verbose) printf("%d candiate peers available\n", num_candidates);
295 if(verbose && syncsource_found) printf("synchronization source found\n");
296 if(! syncsource_found){
297 status = STATE_WARNING;
298 if(verbose) printf("warning: no synchronization source found\n");
299 }
302 for (i = 0; i < npeers; i++){
303 /* Only query this server if it is the current sync source */
304 /* If there's no sync.peer, query all candidates and use the best one */
305 if (PEER_SEL(peers[i].status) >= min_peer_sel){
306 if(verbose) printf("Getting offset, jitter and stratum for peer %.2x\n", ntohs(peers[i].assoc));
307 asprintf(&data, "");
308 do{
309 setup_control_request(&req, OP_READVAR, 2);
310 req.assoc = peers[i].assoc;
311 /* Putting the wanted variable names in the request
312 * cause the server to provide _only_ the requested values.
313 * thus reducing net traffic, guaranteeing us only a single
314 * datagram in reply, and making intepretation much simpler
315 */
316 /* Older servers doesn't know what jitter is, so if we get an
317 * error on the first pass we redo it with "dispersion" */
318 strncpy(req.data, getvar, MAX_CM_SIZE-1);
319 req.count = htons(strlen(getvar));
320 DBG(printf("sending READVAR request...\n"));
321 write(conn, &req, SIZEOF_NTPCM(req));
322 DBG(print_ntp_control_message(&req));
324 req.count = htons(MAX_CM_SIZE);
325 DBG(printf("receiving READVAR response...\n"));
326 read(conn, &req, SIZEOF_NTPCM(req));
327 DBG(print_ntp_control_message(&req));
329 if(!(req.op&REM_ERROR))
330 asprintf(&data, "%s%s", data, req.data);
331 } while(req.op&REM_MORE);
333 if(req.op&REM_ERROR) {
334 if(strstr(getvar, "jitter")) {
335 if(verbose) printf("The command failed. This is usually caused by servers refusing the 'jitter'\nvariable. Restarting with 'dispersion'...\n");
336 getvar = "stratum,offset,dispersion";
337 i--;
338 continue;
339 } else if(strlen(getvar)) {
340 if(verbose) printf("Server didn't like dispersion either; will retrieve everything\n");
341 getvar = "";
342 i--;
343 continue;
344 }
345 }
347 if(verbose > 1)
348 printf("Server responded: >>>%s<<<\n", data);
350 /* get the offset */
351 if(verbose)
352 printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));
354 value = extract_value(data, "offset");
355 nptr=NULL;
356 /* Convert the value if we have one */
357 if(value != NULL)
358 tmp_offset = strtod(value, &nptr) / 1000;
359 /* If value is null or no conversion was performed */
360 if(value == NULL || value==nptr) {
361 if(verbose) printf("error: unable to read server offset response.\n");
362 } else {
363 if(verbose) printf("%.10g\n", tmp_offset);
364 if(*offset_result == STATE_UNKNOWN || fabs(tmp_offset) < fabs(*offset)) {
365 *offset = tmp_offset;
366 *offset_result = STATE_OK;
367 } else {
368 /* Skip this one; move to the next */
369 continue;
370 }
371 }
373 if(do_jitter) {
374 /* get the jitter */
375 if(verbose) {
376 printf("parsing %s from peer %.2x: ", strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter", ntohs(peers[i].assoc));
377 }
378 value = extract_value(data, strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter");
379 nptr=NULL;
380 /* Convert the value if we have one */
381 if(value != NULL)
382 *jitter = strtod(value, &nptr);
383 /* If value is null or no conversion was performed */
384 if(value == NULL || value==nptr) {
385 if(verbose) printf("error: unable to read server jitter/dispersion response.\n");
386 *jitter = -1;
387 } else if(verbose) {
388 printf("%.10g\n", *jitter);
389 }
390 }
392 if(do_stratum) {
393 /* get the stratum */
394 if(verbose) {
395 printf("parsing stratum from peer %.2x: ", ntohs(peers[i].assoc));
396 }
397 value = extract_value(data, "stratum");
398 nptr=NULL;
399 /* Convert the value if we have one */
400 if(value != NULL)
401 *stratum = strtol(value, &nptr, 10);
402 if(value == NULL || value==nptr) {
403 if(verbose) printf("error: unable to read server stratum response.\n");
404 *stratum = -1;
405 } else {
406 if(verbose) printf("%i\n", *stratum);
407 }
408 }
409 } /* if (PEER_SEL(peers[i].status) >= min_peer_sel) */
410 } /* for (i = 0; i < npeers; i++) */
412 close(conn);
413 if(peers!=NULL) free(peers);
415 return status;
416 }
418 int process_arguments(int argc, char **argv){
419 int c;
420 int option=0;
421 static struct option longopts[] = {
422 {"version", no_argument, 0, 'V'},
423 {"help", no_argument, 0, 'h'},
424 {"verbose", no_argument, 0, 'v'},
425 {"use-ipv4", no_argument, 0, '4'},
426 {"use-ipv6", no_argument, 0, '6'},
427 {"quiet", no_argument, 0, 'q'},
428 {"warning", required_argument, 0, 'w'},
429 {"critical", required_argument, 0, 'c'},
430 {"swarn", required_argument, 0, 'W'},
431 {"scrit", required_argument, 0, 'C'},
432 {"jwarn", required_argument, 0, 'j'},
433 {"jcrit", required_argument, 0, 'k'},
434 {"timeout", required_argument, 0, 't'},
435 {"hostname", required_argument, 0, 'H'},
436 {0, 0, 0, 0}
437 };
440 if (argc < 2)
441 usage ("\n");
443 while (1) {
444 c = getopt_long (argc, argv, "Vhv46qw:c:W:C:j:k:t:H:", longopts, &option);
445 if (c == -1 || c == EOF || c == 1)
446 break;
448 switch (c) {
449 case 'h':
450 print_help();
451 exit(STATE_OK);
452 break;
453 case 'V':
454 print_revision(progname, revision);
455 exit(STATE_OK);
456 break;
457 case 'v':
458 verbose++;
459 break;
460 case 'q':
461 quiet = 1;
462 break;
463 case 'w':
464 do_offset=1;
465 owarn = optarg;
466 break;
467 case 'c':
468 do_offset=1;
469 ocrit = optarg;
470 break;
471 case 'W':
472 do_stratum=1;
473 swarn = optarg;
474 break;
475 case 'C':
476 do_stratum=1;
477 scrit = optarg;
478 break;
479 case 'j':
480 do_jitter=1;
481 jwarn = optarg;
482 break;
483 case 'k':
484 do_jitter=1;
485 jcrit = optarg;
486 break;
487 case 'H':
488 if(is_host(optarg) == FALSE)
489 usage2(_("Invalid hostname/address"), optarg);
490 server_address = strdup(optarg);
491 break;
492 case 't':
493 socket_timeout=atoi(optarg);
494 break;
495 case '4':
496 address_family = AF_INET;
497 break;
498 case '6':
499 #ifdef USE_IPV6
500 address_family = AF_INET6;
501 #else
502 usage4 (_("IPv6 support not available"));
503 #endif
504 break;
505 case '?':
506 /* print short usage statement if args not parsable */
507 usage5 ();
508 break;
509 }
510 }
512 if(server_address == NULL){
513 usage4(_("Hostname was not supplied"));
514 }
516 return 0;
517 }
519 char *perfd_offset (double offset)
520 {
521 return fperfdata ("offset", offset, "s",
522 TRUE, offset_thresholds->warning->end,
523 TRUE, offset_thresholds->critical->end,
524 FALSE, 0, FALSE, 0);
525 }
527 char *perfd_jitter (double jitter)
528 {
529 return fperfdata ("jitter", jitter, "",
530 do_jitter, jitter_thresholds->warning->end,
531 do_jitter, jitter_thresholds->critical->end,
532 TRUE, 0, FALSE, 0);
533 }
535 char *perfd_stratum (int stratum)
536 {
537 return perfdata ("stratum", stratum, "",
538 do_stratum, (int)stratum_thresholds->warning->end,
539 do_stratum, (int)stratum_thresholds->critical->end,
540 TRUE, 0, TRUE, 16);
541 }
543 int main(int argc, char *argv[]){
544 int result, offset_result, stratum;
545 double offset=0, jitter=0;
546 char *result_line, *perfdata_line;
548 setlocale (LC_ALL, "");
549 bindtextdomain (PACKAGE, LOCALEDIR);
550 textdomain (PACKAGE);
552 if (process_arguments (argc, argv) == ERROR)
553 usage4 (_("Could not parse arguments"));
555 set_thresholds(&offset_thresholds, owarn, ocrit);
556 set_thresholds(&jitter_thresholds, jwarn, jcrit);
557 set_thresholds(&stratum_thresholds, swarn, scrit);
559 /* initialize alarm signal handling */
560 signal (SIGALRM, socket_timeout_alarm_handler);
562 /* set socket timeout */
563 alarm (socket_timeout);
565 /* This returns either OK or WARNING (See comment preceeding ntp_request) */
566 result = ntp_request(server_address, &offset, &offset_result, &jitter, &stratum);
568 if(offset_result == STATE_UNKNOWN) {
569 /* if there's no sync peer (this overrides ntp_request output): */
570 result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
571 } else {
572 /* Be quiet if there's no candidates either */
573 if (quiet == 1 && result == STATE_WARNING)
574 result = STATE_UNKNOWN;
575 result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));
576 }
578 if(do_stratum)
579 result = max_state_alt(result, get_status(stratum, stratum_thresholds));
581 if(do_jitter)
582 result = max_state_alt(result, get_status(jitter, jitter_thresholds));
584 switch (result) {
585 case STATE_CRITICAL :
586 asprintf(&result_line, _("NTP CRITICAL:"));
587 break;
588 case STATE_WARNING :
589 asprintf(&result_line, _("NTP WARNING:"));
590 break;
591 case STATE_OK :
592 asprintf(&result_line, _("NTP OK:"));
593 break;
594 default :
595 asprintf(&result_line, _("NTP UNKNOWN:"));
596 break;
597 }
598 if(!syncsource_found)
599 asprintf(&result_line, "%s %s,", result_line, _("Server not synchronized"));
601 if(offset_result == STATE_UNKNOWN){
602 asprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
603 asprintf(&perfdata_line, "");
604 } else {
605 asprintf(&result_line, "%s %s %.10g secs", result_line, _("Offset"), offset);
606 asprintf(&perfdata_line, "%s", perfd_offset(offset));
607 }
608 if (do_jitter) {
609 asprintf(&result_line, "%s, jitter=%f", result_line, jitter);
610 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
611 }
612 if (do_stratum) {
613 asprintf(&result_line, "%s, stratum=%i", result_line, stratum);
614 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
615 }
616 printf("%s|%s\n", result_line, perfdata_line);
618 if(server_address!=NULL) free(server_address);
619 return result;
620 }
624 void print_help(void){
625 print_revision(progname, revision);
627 printf ("Copyright (c) 2006 Sean Finney\n");
628 printf (COPYRIGHT, copyright, email);
630 printf ("%s\n", _("This plugin checks the selected ntp server"));
632 printf ("\n\n");
634 print_usage();
635 printf (_(UT_HELP_VRSN));
636 printf (_(UT_HOST_PORT), 'p', "123");
637 printf (" %s\n", "-q, --quiet");
638 printf (" %s\n", _("Returns UNKNOWN instead of CRITICAL or WARNING if server isn't synchronized"));
639 printf (" %s\n", "-w, --warning=THRESHOLD");
640 printf (" %s\n", _("Offset to result in warning status (seconds)"));
641 printf (" %s\n", "-c, --critical=THRESHOLD");
642 printf (" %s\n", _("Offset to result in critical status (seconds)"));
643 printf (" %s\n", "-W, --warning=THRESHOLD");
644 printf (" %s\n", _("Warning threshold for stratum"));
645 printf (" %s\n", "-W, --critical=THRESHOLD");
646 printf (" %s\n", _("Critical threshold for stratum"));
647 printf (" %s\n", "-j, --warning=THRESHOLD");
648 printf (" %s\n", _("Warning threshold for jitter"));
649 printf (" %s\n", "-k, --critical=THRESHOLD");
650 printf (" %s\n", _("Critical threshold for jitter"));
651 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
652 printf (_(UT_VERBOSE));
654 printf("\n");
655 printf("%s\n", _("Notes:"));
656 printf(" %s\n", _("This plugin checks an NTP server independent of any commandline"));
657 printf(" %s\n\n", _("programs or external libraries."));
658 printf(" %s\n", _("Use this plugin to check the health of an NTP server. It supports"));
659 printf(" %s\n", _("checking the offset with the sync peer, the jitter and stratum. This"));
660 printf(" %s\n", _("plugin will not check the clock offset between the local host and NTP"));
661 printf(" %s\n\n", _("server; please use check_ntp_time for that purpose."));
663 printf(" %s\n", _("See:"));
664 printf(" %s\n", ("http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT"));
665 printf(" %s\n", _("for THRESHOLD format and examples."));
667 printf("\n");
668 printf("%s\n", _("Examples:"));
669 printf(" %s\n", _("Simple NTP server check:"));
670 printf(" %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1"));
671 printf(" %s\n", _("Check jitter too, avoiding critical notifications if jitter isn't available"));
672 printf(" %s\n", _("(See Notes above for more details on thresholds formats):"));
673 printf(" %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
674 printf(" %s\n", _("Check only stratum:"));
675 printf(" %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));
677 printf (_(UT_SUPPORT));
678 }
680 void
681 print_usage(void)
682 {
683 printf (_("Usage:"));
684 printf(" %s -H <host> [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
685 printf(" [-j <warn>] [-k <crit>] [-v verbose]\n");
686 }