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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 to check ntp servers independant of any commandline
16* programs or external libraries.
17*
18*
19* License Information:
20*
21* This program is free software; you can redistribute it and/or modify
22* it under the terms of the GNU General Public License as published by
23* the Free Software Foundation; either version 2 of the License, or
24* (at your option) any later version.
25*
26* This program is distributed in the hope that it will be useful,
27* but WITHOUT ANY WARRANTY; without even the implied warranty of
28* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29* GNU General Public License for more details.
30*
31* You should have received a copy of the GNU General Public License
32* along with this program; if not, write to the Free Software
33* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34
35 $Id$
36
37*****************************************************************************/
38
39const char *progname = "check_ntp_peer";
40const char *revision = "$Revision$";
41const char *copyright = "2007";
42const char *email = "nagiosplug-devel@lists.sourceforge.net";
43
44#include "common.h"
45#include "netutils.h"
46#include "utils.h"
47
48static char *server_address=NULL;
49static int verbose=0;
50static short do_offset=0;
51static char *owarn="60";
52static char *ocrit="120";
53static short do_stratum=0;
54static char *swarn="16";
55static char *scrit="16";
56static short do_jitter=0;
57static char *jwarn="5000";
58static char *jcrit="10000";
59static int syncsource_found=0;
60
61int process_arguments (int, char **);
62thresholds *offset_thresholds = NULL;
63thresholds *jitter_thresholds = NULL;
64thresholds *stratum_thresholds = NULL;
65void print_help (void);
66void print_usage (void);
67
68/* max size of control message data */
69#define MAX_CM_SIZE 468
70
71/* this structure holds everything in an ntp control message as per rfc1305 */
72typedef struct {
73 uint8_t flags; /* byte with leapindicator,vers,mode. see macros */
74 uint8_t op; /* R,E,M bits and Opcode */
75 uint16_t seq; /* Packet sequence */
76 uint16_t status; /* Clock status */
77 uint16_t assoc; /* Association */
78 uint16_t offset; /* Similar to TCP sequence # */
79 uint16_t count; /* # bytes of data */
80 char data[MAX_CM_SIZE]; /* ASCII data of the request */
81 /* NB: not necessarily NULL terminated! */
82} ntp_control_message;
83
84/* this is an association/status-word pair found in control packet reponses */
85typedef struct {
86 uint16_t assoc;
87 uint16_t status;
88} ntp_assoc_status_pair;
89
90/* bits 1,2 are the leap indicator */
91#define LI_MASK 0xc0
92#define LI(x) ((x&LI_MASK)>>6)
93#define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
94/* and these are the values of the leap indicator */
95#define LI_NOWARNING 0x00
96#define LI_EXTRASEC 0x01
97#define LI_MISSINGSEC 0x02
98#define LI_ALARM 0x03
99/* bits 3,4,5 are the ntp version */
100#define VN_MASK 0x38
101#define VN(x) ((x&VN_MASK)>>3)
102#define VN_SET(x,y) do{ x |= ((y<<3)&VN_MASK); }while(0)
103#define VN_RESERVED 0x02
104/* bits 6,7,8 are the ntp mode */
105#define MODE_MASK 0x07
106#define MODE(x) (x&MODE_MASK)
107#define MODE_SET(x,y) do{ x |= (y&MODE_MASK); }while(0)
108/* here are some values */
109#define MODE_CLIENT 0x03
110#define MODE_CONTROLMSG 0x06
111/* In control message, bits 8-10 are R,E,M bits */
112#define REM_MASK 0xe0
113#define REM_RESP 0x80
114#define REM_ERROR 0x40
115#define REM_MORE 0x20
116/* In control message, bits 11 - 15 are opcode */
117#define OP_MASK 0x1f
118#define OP_SET(x,y) do{ x |= (y&OP_MASK); }while(0)
119#define OP_READSTAT 0x01
120#define OP_READVAR 0x02
121/* In peer status bytes, bits 6,7,8 determine clock selection status */
122#define PEER_SEL(x) ((ntohs(x)>>8)&0x07)
123#define PEER_INCLUDED 0x04
124#define PEER_SYNCSOURCE 0x06
125
126/* NTP control message header is 12 bytes, plus any data in the data
127 * field, plus null padding to the nearest 32-bit boundary per rfc.
128 */
129#define SIZEOF_NTPCM(m) (12+ntohs(m.count)+((m.count)?4-(ntohs(m.count)%4):0))
130
131/* finally, a little helper or two for debugging: */
132#define DBG(x) do{if(verbose>1){ x; }}while(0);
133#define PRINTSOCKADDR(x) \
134 do{ \
135 printf("%u.%u.%u.%u", (x>>24)&0xff, (x>>16)&0xff, (x>>8)&0xff, x&0xff);\
136 }while(0);
137
138void print_ntp_control_message(const ntp_control_message *p){
139 int i=0, numpeers=0;
140 const ntp_assoc_status_pair *peer=NULL;
141
142 printf("control packet contents:\n");
143 printf("\tflags: 0x%.2x , 0x%.2x\n", p->flags, p->op);
144 printf("\t li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
145 printf("\t vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
146 printf("\t mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
147 printf("\t response=%d (0x%.2x)\n", (p->op&REM_RESP)>0, p->op&REM_RESP);
148 printf("\t more=%d (0x%.2x)\n", (p->op&REM_MORE)>0, p->op&REM_MORE);
149 printf("\t error=%d (0x%.2x)\n", (p->op&REM_ERROR)>0, p->op&REM_ERROR);
150 printf("\t op=%d (0x%.2x)\n", p->op&OP_MASK, p->op&OP_MASK);
151 printf("\tsequence: %d (0x%.2x)\n", ntohs(p->seq), ntohs(p->seq));
152 printf("\tstatus: %d (0x%.2x)\n", ntohs(p->status), ntohs(p->status));
153 printf("\tassoc: %d (0x%.2x)\n", ntohs(p->assoc), ntohs(p->assoc));
154 printf("\toffset: %d (0x%.2x)\n", ntohs(p->offset), ntohs(p->offset));
155 printf("\tcount: %d (0x%.2x)\n", ntohs(p->count), ntohs(p->count));
156 numpeers=ntohs(p->count)/(sizeof(ntp_assoc_status_pair));
157 if(p->op&REM_RESP && p->op&OP_READSTAT){
158 peer=(ntp_assoc_status_pair*)p->data;
159 for(i=0;i<numpeers;i++){
160 printf("\tpeer id %.2x status %.2x",
161 ntohs(peer[i].assoc), ntohs(peer[i].status));
162 if (PEER_SEL(peer[i].status) >= PEER_INCLUDED){
163 if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
164 printf(" <-- current sync source");
165 } else {
166 printf(" <-- current sync candidate");
167 }
168 }
169 printf("\n");
170 }
171 }
172}
173
174char *extract_value(const char *varlist, const char *name){
175 char *tmpvarlist=NULL, *tmpkey=NULL, *value=NULL;
176 int last=0;
177
178 tmpvarlist = strdup(varlist);
179 tmpkey = strtok(tmpvarlist, "=");
180
181 do {
182 if(strstr(tmpkey, name) != NULL) {
183 value = strtok(NULL, ",");
184 last = 1;
185 }
186 } while (last == 0 && (tmpkey = strtok(NULL, "=")));
187
188 return value;
189}
190
191void
192setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
193 memset(p, 0, sizeof(ntp_control_message));
194 LI_SET(p->flags, LI_NOWARNING);
195 VN_SET(p->flags, VN_RESERVED);
196 MODE_SET(p->flags, MODE_CONTROLMSG);
197 OP_SET(p->op, opcode);
198 p->seq = htons(seq);
199 /* Remaining fields are zero for requests */
200}
201
202/* XXX handle responses with the error bit set */
203int ntp_request(const char *host, double *offset, int *offset_result, double *jitter, int *stratum){
204 int conn=-1, i, npeers=0, num_candidates=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 *value=NULL, *nptr=NULL;
212 void *tmp;
213
214 status = STATE_OK;
215 *offset_result = STATE_UNKNOWN;
216 *jitter = *stratum = -1;
217
218 /* Long-winded explanation:
219 * Getting the sync peer offset, jitter and stratum requires a number of
220 * steps:
221 * 1) Send a READSTAT request.
222 * 2) Interpret the READSTAT reply
223 * a) The data section contains a list of peer identifiers (16 bits)
224 * and associated status words (16 bits)
225 * b) We want the value of 0x06 in the SEL (peer selection) value,
226 * which means "current synchronizatin source". If that's missing,
227 * we take anything better than 0x04 (see the rfc for details) but
228 * set a minimum of warning.
229 * 3) Send a READVAR request for information on each peer identified
230 * in 2b greater than the minimum selection value.
231 * 4) Extract the offset, jitter and stratum value from the data[]
232 * (it's ASCII)
233 */
234 my_udp_connect(server_address, 123, &conn);
235
236 /* keep sending requests until the server stops setting the
237 * REM_MORE bit, though usually this is only 1 packet. */
238 do{
239 setup_control_request(&req, OP_READSTAT, 1);
240 DBG(printf("sending READSTAT request"));
241 write(conn, &req, SIZEOF_NTPCM(req));
242 DBG(print_ntp_control_message(&req));
243 /* Attempt to read the largest size packet possible */
244 req.count=htons(MAX_CM_SIZE);
245 DBG(printf("recieving READSTAT response"))
246 read(conn, &req, SIZEOF_NTPCM(req));
247 DBG(print_ntp_control_message(&req));
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 case of the latter 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
279
280 for (i = 0; i < npeers; i++){
281 /* Only query this server if it is the current sync source */
282 if (PEER_SEL(peers[i].status) >= min_peer_sel){
283 if(verbose) printf("Getting offset, jitter and stratum for peer %.2x\n", ntohs(peers[i].assoc));
284 setup_control_request(&req, OP_READVAR, 2);
285 req.assoc = peers[i].assoc;
286 /* Putting the wanted variable names in the request
287 * cause the server to provide _only_ the requested values.
288 * thus reducing net traffic, guaranteeing us only a single
289 * datagram in reply, and making intepretation much simpler
290 */
291 /* Older servers doesn't know what jitter is, so if we get an
292 * error on the first pass we redo it with "dispersion" */
293 strncpy(req.data, getvar, MAX_CM_SIZE-1);
294 req.count = htons(strlen(getvar));
295 DBG(printf("sending READVAR request...\n"));
296 write(conn, &req, SIZEOF_NTPCM(req));
297 DBG(print_ntp_control_message(&req));
298
299 req.count = htons(MAX_CM_SIZE);
300 DBG(printf("recieving READVAR response...\n"));
301 read(conn, &req, SIZEOF_NTPCM(req));
302 DBG(print_ntp_control_message(&req));
303
304 if(req.op&REM_ERROR && strstr(getvar, "jitter")) {
305 if(verbose) printf("The 'jitter' command failed (old ntp server?)\nRestarting with 'dispersion'...\n");
306 getvar = "stratum,offset,dispersion";
307 i--;
308 continue;
309 }
310
311 if(verbose > 1)
312 printf("Server responded: >>>%s<<<\n", req.data);
313
314 /* get the offset */
315 if(verbose)
316 printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));
317
318 value = extract_value(req.data, "offset");
319 /* Convert the value if we have one */
320 if(value != NULL)
321 *offset = strtod(value, &nptr) / 1000;
322 /* If value is null or no conversion was performed */
323 if(value == NULL || value==nptr) {
324 printf("warning: unable to read server offset response.\n");
325 status = max_state_alt(status, STATE_CRITICAL);
326 } else {
327 *offset_result = STATE_OK;
328 if(verbose) printf("%g\n", *offset);
329 }
330
331 if(do_jitter) {
332 /* first reset the pointers */
333 value = NULL, nptr=NULL;
334 /* get the jitter */
335 if(verbose) {
336 printf("parsing jitter from peer %.2x: ", ntohs(peers[i].assoc));
337 }
338 value = extract_value(req.data, strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter");
339 /* Convert the value if we have one */
340 if(value != NULL)
341 *jitter = strtod(value, &nptr);
342 /* If value is null or no conversion was performed */
343 if(value == NULL || value==nptr){
344 printf("warning: unable to read server jitter response.\n");
345 status = max_state_alt(status, STATE_UNKNOWN);
346 } else {
347 if(verbose) printf("%g\n", *jitter);
348 }
349 }
350
351 if(do_stratum) {
352 value = NULL;
353 /* get the stratum */
354 if(verbose) {
355 printf("parsing stratum from peer %.2x: ", ntohs(peers[i].assoc));
356 }
357 value = extract_value(req.data, "stratum");
358 if(value == NULL){
359 printf("warning: unable to read server stratum response.\n");
360 status = max_state_alt(status, STATE_UNKNOWN);
361 } else {
362 *stratum = atoi(value);
363 if(verbose) printf("%i\n", *stratum);
364 }
365 }
366 } /* if (PEER_SEL(peers[i].status) >= min_peer_sel) */
367 } /* for (i = 0; i < npeers; i++) */
368
369 close(conn);
370 if(peers!=NULL) free(peers);
371
372 return status;
373}
374
375int process_arguments(int argc, char **argv){
376 int c;
377 int option=0;
378 static struct option longopts[] = {
379 {"version", no_argument, 0, 'V'},
380 {"help", no_argument, 0, 'h'},
381 {"verbose", no_argument, 0, 'v'},
382 {"use-ipv4", no_argument, 0, '4'},
383 {"use-ipv6", no_argument, 0, '6'},
384 {"warning", required_argument, 0, 'w'},
385 {"critical", required_argument, 0, 'c'},
386 {"swarn", required_argument, 0, 'W'},
387 {"scrit", required_argument, 0, 'C'},
388 {"jwarn", required_argument, 0, 'j'},
389 {"jcrit", required_argument, 0, 'k'},
390 {"timeout", required_argument, 0, 't'},
391 {"hostname", required_argument, 0, 'H'},
392 {0, 0, 0, 0}
393 };
394
395
396 if (argc < 2)
397 usage ("\n");
398
399 while (1) {
400 c = getopt_long (argc, argv, "Vhv46w:c:W:C:j:k:t:H:", longopts, &option);
401 if (c == -1 || c == EOF || c == 1)
402 break;
403
404 switch (c) {
405 case 'h':
406 print_help();
407 exit(STATE_OK);
408 break;
409 case 'V':
410 print_revision(progname, revision);
411 exit(STATE_OK);
412 break;
413 case 'v':
414 verbose++;
415 break;
416 case 'w':
417 do_offset=1;
418 owarn = optarg;
419 break;
420 case 'c':
421 do_offset=1;
422 ocrit = optarg;
423 break;
424 case 'W':
425 do_stratum=1;
426 swarn = optarg;
427 break;
428 case 'C':
429 do_stratum=1;
430 scrit = optarg;
431 break;
432 case 'j':
433 do_jitter=1;
434 jwarn = optarg;
435 break;
436 case 'k':
437 do_jitter=1;
438 jcrit = optarg;
439 break;
440 case 'H':
441 if(is_host(optarg) == FALSE)
442 usage2(_("Invalid hostname/address"), optarg);
443 server_address = strdup(optarg);
444 break;
445 case 't':
446 socket_timeout=atoi(optarg);
447 break;
448 case '4':
449 address_family = AF_INET;
450 break;
451 case '6':
452#ifdef USE_IPV6
453 address_family = AF_INET6;
454#else
455 usage4 (_("IPv6 support not available"));
456#endif
457 break;
458 case '?':
459 /* print short usage statement if args not parsable */
460 usage5 ();
461 break;
462 }
463 }
464
465 if(server_address == NULL){
466 usage4(_("Hostname was not supplied"));
467 }
468
469 return 0;
470}
471
472char *perfd_offset (double offset)
473{
474 return fperfdata ("offset", offset, "s",
475 TRUE, offset_thresholds->warning->end,
476 TRUE, offset_thresholds->critical->end,
477 FALSE, 0, FALSE, 0);
478}
479
480char *perfd_jitter (double jitter)
481{
482 return fperfdata ("jitter", jitter, "s",
483 do_jitter, jitter_thresholds->warning->end,
484 do_jitter, jitter_thresholds->critical->end,
485 TRUE, 0, FALSE, 0);
486}
487
488char *perfd_stratum (int stratum)
489{
490 return perfdata ("stratum", stratum, "",
491 do_stratum, (int)stratum_thresholds->warning->end,
492 do_stratum, (int)stratum_thresholds->critical->end,
493 TRUE, 0, TRUE, 16);
494}
495
496int main(int argc, char *argv[]){
497 int result, offset_result, stratum;
498 double offset=0, jitter=0;
499 char *result_line, *perfdata_line;
500
501 result = offset_result = STATE_OK;
502
503 if (process_arguments (argc, argv) == ERROR)
504 usage4 (_("Could not parse arguments"));
505
506 set_thresholds(&offset_thresholds, owarn, ocrit);
507 set_thresholds(&jitter_thresholds, jwarn, jcrit);
508 set_thresholds(&stratum_thresholds, swarn, scrit);
509
510 /* initialize alarm signal handling */
511 signal (SIGALRM, socket_timeout_alarm_handler);
512
513 /* set socket timeout */
514 alarm (socket_timeout);
515
516 result = ntp_request(server_address, &offset, &offset_result, &jitter, &stratum);
517 result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));
518
519 if(do_stratum)
520 result = max_state_alt(result, get_status(stratum, stratum_thresholds));
521
522 if(do_jitter)
523 result = max_state_alt(result, get_status(jitter, jitter_thresholds));
524
525 switch (result) {
526 case STATE_CRITICAL :
527 asprintf(&result_line, "NTP CRITICAL:");
528 break;
529 case STATE_WARNING :
530 asprintf(&result_line, "NTP WARNING:");
531 break;
532 case STATE_OK :
533 asprintf(&result_line, "NTP OK:");
534 break;
535 default :
536 asprintf(&result_line, "NTP UNKNOWN:");
537 break;
538 }
539 if(!syncsource_found)
540 asprintf(&result_line, "%s %s, ", result_line, _("Server not synchronized"));
541
542 if(offset_result == STATE_UNKNOWN){
543 asprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
544 asprintf(&perfdata_line, "");
545 } else {
546 asprintf(&result_line, "%s Offset %.10g secs", result_line, offset);
547 asprintf(&perfdata_line, "%s", perfd_offset(offset));
548 }
549 if (do_jitter) {
550 asprintf(&result_line, "%s, jitter=%f", result_line, jitter);
551 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
552 }
553 if (do_stratum) {
554 asprintf(&result_line, "%s, stratum=%i", result_line, stratum);
555 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
556 }
557 printf("%s|%s\n", result_line, perfdata_line);
558
559 if(server_address!=NULL) free(server_address);
560 return result;
561}
562
563
564
565void print_help(void){
566 print_revision(progname, revision);
567
568 printf ("Copyright (c) 2006 Sean Finney\n");
569 printf (COPYRIGHT, copyright, email);
570
571 printf ("%s\n", _("This plugin checks the selected ntp server"));
572
573 printf ("\n\n");
574
575 print_usage();
576 printf (_(UT_HELP_VRSN));
577 printf (_(UT_HOST_PORT), 'p', "123");
578 printf (" %s\n", "-w, --warning=THRESHOLD");
579 printf (" %s\n", _("Offset to result in warning status (seconds)"));
580 printf (" %s\n", "-c, --critical=THRESHOLD");
581 printf (" %s\n", _("Offset to result in critical status (seconds)"));
582 printf (" %s\n", "-W, --warning=THRESHOLD");
583 printf (" %s\n", _("Warning threshold for stratum"));
584 printf (" %s\n", "-W, --critical=THRESHOLD");
585 printf (" %s\n", _("Critical threshold for stratum"));
586 printf (" %s\n", "-j, --warning=THRESHOLD");
587 printf (" %s\n", _("Warning threshold for jitter"));
588 printf (" %s\n", "-k, --critical=THRESHOLD");
589 printf (" %s\n", _("Critical threshold for jitter"));
590 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
591 printf (_(UT_VERBOSE));
592
593 printf("\n");
594 printf("%s\n", _("Notes:"));
595 printf(" %s\n", _("See:"));
596 printf(" %s\n", ("http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT"));
597 printf(" %s\n", _("for THRESHOLD format and examples."));
598
599 printf("\n");
600 printf("%s\n", _("Examples:"));
601 printf(" %s\n", _("Normal offset check:"));
602 printf(" %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1"));
603 printf(" %s\n", _("Check jitter too, avoiding critical notifications if jitter isn't available"));
604 printf(" %s\n", _("(See Notes above for more details on thresholds formats):"));
605 printf(" %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
606 printf(" %s\n", _("Check only stratum:"));
607 printf(" %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));
608
609 printf (_(UT_SUPPORT));
610}
611
612void
613print_usage(void)
614{
615 printf (_("Usage:"));
616 printf(" %s -H <host> [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
617 printf(" [-j <warn>] [-k <crit>] [-v verbose]\n");
618}