plugins/check_ntp_peer.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_ntp_peer plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2006 Sean Finney <seanius@seanius.net>
   7 * Copyright (c) 2006-2008 Nagios Plugins Development Team
   8 *
   9 * Description:
  10 *
  11 * This file contains the check_ntp_peer plugin
  12 *
  13 * This plugin checks an NTP server independent of any commandline
  14 * programs or external libraries.
  15 *
  16 * Use this plugin to check the health of an NTP server. It supports
  17 * checking the offset with the sync peer, the jitter and stratum. This
  18 * plugin will not check the clock offset between the local host and NTP
  19 * server; please use check_ntp_time for that purpose.
  20 *
  21 *
  22 * This program is free software: you can redistribute it and/or modify
  23 * it under the terms of the GNU General Public License as published by
  24 * the Free Software Foundation, either version 3 of the License, or
  25 * (at your option) any later version.
  26 *
  27 * This program is distributed in the hope that it will be useful,
  28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30 * GNU General Public License for more details.
  31 *
  32 * You should have received a copy of the GNU General Public License
  33 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  34 *
  35 *
  36 *****************************************************************************/
  37
  38 const char *progname = "check_ntp_peer";
  39 const char *copyright = "2006-2008";
  40 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  41
  42 #include "common.h"
  43 #include "netutils.h"
  44 #include "utils.h"
  45
  46 static char *server_address=NULL;
  47 static int port=123;
  48 static int verbose=0;
  49 static int quiet=0;
  50 static short do_offset=0;
  51 static char *owarn="60";
  52 static char *ocrit="120";
  53 static short do_stratum=0;
  54 static char *swarn="-1:16";
  55 static char *scrit="-1:16";
  56 static short do_jitter=0;
  57 static char *jwarn="-1:5000";
  58 static char *jcrit="-1:10000";
  59 static short do_truechimers=0;
  60 static char *twarn="0:";
  61 static char *tcrit="0:";
  62 static int syncsource_found=0;
  63 static int li_alarm=0;
  64
  65 int process_arguments (int, char **);
  66 thresholds *offset_thresholds = NULL;
  67 thresholds *jitter_thresholds = NULL;
  68 thresholds *stratum_thresholds = NULL;
  69 thresholds *truechimer_thresholds = NULL;
  70 void print_help (void);
  71 void print_usage (void);
  72
  73 /* max size of control message data */
  74 #define MAX_CM_SIZE 468
  75
  76 /* this structure holds everything in an ntp control message as per rfc1305 */
  77 typedef struct {
  78         uint8_t flags;       /* byte with leapindicator,vers,mode. see macros */
  79         uint8_t op;          /* R,E,M bits and Opcode */
  80         uint16_t seq;        /* Packet sequence */
  81         uint16_t status;     /* Clock status */
  82         uint16_t assoc;      /* Association */
  83         uint16_t offset;     /* Similar to TCP sequence # */
  84         uint16_t count;      /* # bytes of data */
  85         char data[MAX_CM_SIZE]; /* ASCII data of the request */
  86                                 /* NB: not necessarily NULL terminated! */
  87 } ntp_control_message;
  88
  89 /* this is an association/status-word pair found in control packet reponses */
  90 typedef struct {
  91         uint16_t assoc;
  92         uint16_t status;
  93 } ntp_assoc_status_pair;
  94
  95 /* bits 1,2 are the leap indicator */
  96 #define LI_MASK 0xc0
  97 #define LI(x) ((x&LI_MASK)>>6)
  98 #define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
  99 /* and these are the values of the leap indicator */
 100 #define LI_NOWARNING 0x00
 101 #define LI_EXTRASEC 0x01
 102 #define LI_MISSINGSEC 0x02
 103 #define LI_ALARM 0x03
 104 /* bits 3,4,5 are the ntp version */
 105 #define VN_MASK 0x38
 106 #define VN(x)   ((x&VN_MASK)>>3)
 107 #define VN_SET(x,y)     do{ x |= ((y<<3)&VN_MASK); }while(0)
 108 #define VN_RESERVED 0x02
 109 /* bits 6,7,8 are the ntp mode */
 110 #define MODE_MASK 0x07
 111 #define MODE(x) (x&MODE_MASK)
 112 #define MODE_SET(x,y)   do{ x |= (y&MODE_MASK); }while(0)
 113 /* here are some values */
 114 #define MODE_CLIENT 0x03
 115 #define MODE_CONTROLMSG 0x06
 116 /* In control message, bits 8-10 are R,E,M bits */
 117 #define REM_MASK 0xe0
 118 #define REM_RESP 0x80
 119 #define REM_ERROR 0x40
 120 #define REM_MORE 0x20
 121 /* In control message, bits 11 - 15 are opcode */
 122 #define OP_MASK 0x1f
 123 #define OP_SET(x,y)   do{ x |= (y&OP_MASK); }while(0)
 124 #define OP_READSTAT 0x01
 125 #define OP_READVAR  0x02
 126 /* In peer status bytes, bits 6,7,8 determine clock selection status */
 127 #define PEER_SEL(x) ((ntohs(x)>>8)&0x07)
 128 #define PEER_TRUECHIMER 0x02
 129 #define PEER_INCLUDED 0x04
 130 #define PEER_SYNCSOURCE 0x06
 131
 132 /* NTP control message header is 12 bytes, plus any data in the data
 133  * field, plus null padding to the nearest 32-bit boundary per rfc.
 134  */
 135 #define SIZEOF_NTPCM(m) (12+ntohs(m.count)+((ntohs(m.count)%4)?4-(ntohs(m.count)%4):0))
 136
 137 /* finally, a little helper or two for debugging: */
 138 #define DBG(x) do{if(verbose>1){ x; }}while(0);
 139 #define PRINTSOCKADDR(x) \
 140         do{ \
 141                 printf("%u.%u.%u.%u", (x>>24)&0xff, (x>>16)&0xff, (x>>8)&0xff, x&0xff);\
 142         }while(0);
 143
 144 void print_ntp_control_message(const ntp_control_message *p){
 145         int i=0, numpeers=0;
 146         const ntp_assoc_status_pair *peer=NULL;
 147
 148         printf("control packet contents:\n");
 149         printf("\tflags: 0x%.2x , 0x%.2x\n", p->flags, p->op);
 150         printf("\t  li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
 151         printf("\t  vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
 152         printf("\t  mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
 153         printf("\t  response=%d (0x%.2x)\n", (p->op&REM_RESP)>0, p->op&REM_RESP);
 154         printf("\t  more=%d (0x%.2x)\n", (p->op&REM_MORE)>0, p->op&REM_MORE);
 155         printf("\t  error=%d (0x%.2x)\n", (p->op&REM_ERROR)>0, p->op&REM_ERROR);
 156         printf("\t  op=%d (0x%.2x)\n", p->op&OP_MASK, p->op&OP_MASK);
 157         printf("\tsequence: %d (0x%.2x)\n", ntohs(p->seq), ntohs(p->seq));
 158         printf("\tstatus: %d (0x%.2x)\n", ntohs(p->status), ntohs(p->status));
 159         printf("\tassoc: %d (0x%.2x)\n", ntohs(p->assoc), ntohs(p->assoc));
 160         printf("\toffset: %d (0x%.2x)\n", ntohs(p->offset), ntohs(p->offset));
 161         printf("\tcount: %d (0x%.2x)\n", ntohs(p->count), ntohs(p->count));
 162         numpeers=ntohs(p->count)/(sizeof(ntp_assoc_status_pair));
 163         if(p->op&REM_RESP && p->op&OP_READSTAT){
 164                 peer=(ntp_assoc_status_pair*)p->data;
 165                 for(i=0;i<numpeers;i++){
 166                         printf("\tpeer id %.2x status %.2x",
 167                                ntohs(peer[i].assoc), ntohs(peer[i].status));
 168                         if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
 169                                 printf(" <-- current sync source");
 170                         } else if(PEER_SEL(peer[i].status) >= PEER_INCLUDED){
 171                                 printf(" <-- current sync candidate");
 172                         } else if(PEER_SEL(peer[i].status) >= PEER_TRUECHIMER){
 173                                 printf(" <-- outlyer, but truechimer");
 174                         }
 175                         printf("\n");
 176                 }
 177         }
 178 }
 179
 180 void
 181 setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
 182         memset(p, 0, sizeof(ntp_control_message));
 183         LI_SET(p->flags, LI_NOWARNING);
 184         VN_SET(p->flags, VN_RESERVED);
 185         MODE_SET(p->flags, MODE_CONTROLMSG);
 186         OP_SET(p->op, opcode);
 187         p->seq = htons(seq);
 188         /* Remaining fields are zero for requests */
 189 }
 190
 191 /* This function does all the actual work; roughly here's what it does
 192  * beside setting the offest, jitter and stratum passed as argument:
 193  *  - offset can be negative, so if it cannot get the offset, offset_result
 194  *    is set to UNKNOWN, otherwise OK.
 195  *  - jitter and stratum are set to -1 if they cannot be retrieved so any
 196  *    positive value means a success retrieving the value.
 197  *  - status is set to WARNING if there's no sync.peer (otherwise OK) and is
 198  *    the return value of the function.
 199  *  status is pretty much useless as syncsource_found is a global variable
 200  *  used later in main to check is the server was synchronized. It works
 201  *  so I left it alone */
 202 int ntp_request(const char *host, double *offset, int *offset_result, double *jitter, int *stratum, int *num_truechimers){
 203         int conn=-1, i, npeers=0, num_candidates=0;
 204         double tmp_offset = 0;
 205         int min_peer_sel=PEER_INCLUDED;
 206         int peers_size=0, peer_offset=0;
 207         int status;
 208         ntp_assoc_status_pair *peers=NULL;
 209         ntp_control_message req;
 210         const char *getvar = "stratum,offset,jitter";
 211         char *data, *value, *nptr;
 212         void *tmp;
 213
 214         status = STATE_OK;
 215         *offset_result = STATE_UNKNOWN;
 216         *jitter = *stratum = -1;
 217         *num_truechimers = 0;
 218
 219         /* Long-winded explanation:
 220          * Getting the sync peer offset, jitter and stratum requires a number of
 221          * steps:
 222          * 1) Send a READSTAT request.
 223          * 2) Interpret the READSTAT reply
 224          *  a) The data section contains a list of peer identifiers (16 bits)
 225          *     and associated status words (16 bits)
 226          *  b) We want the value of 0x06 in the SEL (peer selection) value,
 227          *     which means "current synchronizatin source".  If that's missing,
 228          *     we take anything better than 0x04 (see the rfc for details) but
 229          *     set a minimum of warning.
 230          * 3) Send a READVAR request for information on each peer identified
 231          *    in 2b greater than the minimum selection value.
 232          * 4) Extract the offset, jitter and stratum value from the data[]
 233          *    (it's ASCII)
 234          */
 235         my_udp_connect(server_address, port, &conn);
 236
 237         /* keep sending requests until the server stops setting the
 238          * REM_MORE bit, though usually this is only 1 packet. */
 239         do{
 240                 setup_control_request(&req, OP_READSTAT, 1);
 241                 DBG(printf("sending READSTAT request"));
 242                 write(conn, &req, SIZEOF_NTPCM(req));
 243                 DBG(print_ntp_control_message(&req));
 244
 245                 do {
 246                         /* Attempt to read the largest size packet possible */
 247                         req.count=htons(MAX_CM_SIZE);
 248                         DBG(printf("recieving READSTAT response"))
 249                         if(read(conn, &req, SIZEOF_NTPCM(req)) == -1)
 250                                 die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
 251                         DBG(print_ntp_control_message(&req));
 252                         /* discard obviously invalid packets */
 253                         if (ntohs(req.count) > MAX_CM_SIZE)
 254                                 die(STATE_CRITICAL, "NTP CRITICAL: Invalid packet received from NTP server\n");
 255                 } while (!(req.op&OP_READSTAT && ntohs(req.seq) == 1));
 256
 257                 if (LI(req.flags) == LI_ALARM) li_alarm = 1;
 258                 /* Each peer identifier is 4 bytes in the data section, which
 259                  * we represent as a ntp_assoc_status_pair datatype.
 260                  */
 261                 peers_size+=ntohs(req.count);
 262                 if((tmp=realloc(peers, peers_size)) == NULL)
 263                         free(peers), die(STATE_UNKNOWN, "can not (re)allocate 'peers' buffer\n");
 264                 peers=tmp;
 265                 memcpy((void*)((ptrdiff_t)peers+peer_offset), (void*)req.data, ntohs(req.count));
 266                 npeers=peers_size/sizeof(ntp_assoc_status_pair);
 267                 peer_offset+=ntohs(req.count);
 268         } while(req.op&REM_MORE);
 269
 270         /* first, let's find out if we have a sync source, or if there are
 271          * at least some candidates. In the latter case we'll issue
 272          * a warning but go ahead with the check on them. */
 273         for (i = 0; i < npeers; i++){
 274                 if(PEER_SEL(peers[i].status) >= PEER_TRUECHIMER){
 275                         (*num_truechimers)++;
 276                         if(PEER_SEL(peers[i].status) >= PEER_INCLUDED){
 277                                 num_candidates++;
 278                                 if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
 279                                         syncsource_found=1;
 280                                         min_peer_sel=PEER_SYNCSOURCE;
 281                                 }
 282                         }
 283                 }
 284         }
 285         if(verbose) printf("%d candidate peers available\n", num_candidates);
 286         if(verbose && syncsource_found) printf("synchronization source found\n");
 287         if(! syncsource_found){
 288                 status = STATE_WARNING;
 289                 if(verbose) printf("warning: no synchronization source found\n");
 290         }
 291         if(li_alarm){
 292                 status = STATE_WARNING;
 293                 if(verbose) printf("warning: LI_ALARM bit is set\n");
 294         }
 295
 296
 297         for (i = 0; i < npeers; i++){
 298                 /* Only query this server if it is the current sync source */
 299                 /* If there's no sync.peer, query all candidates and use the best one */
 300                 if (PEER_SEL(peers[i].status) >= min_peer_sel){
 301                         if(verbose) printf("Getting offset, jitter and stratum for peer %.2x\n", ntohs(peers[i].assoc));
 302                         xasprintf(&data, "");
 303                         do{
 304                                 setup_control_request(&req, OP_READVAR, 2);
 305                                 req.assoc = peers[i].assoc;
 306                                 /* Putting the wanted variable names in the request
 307                                  * cause the server to provide _only_ the requested values.
 308                                  * thus reducing net traffic, guaranteeing us only a single
 309                                  * datagram in reply, and making intepretation much simpler
 310                                  */
 311                                 /* Older servers doesn't know what jitter is, so if we get an
 312                                  * error on the first pass we redo it with "dispersion" */
 313                                 strncpy(req.data, getvar, MAX_CM_SIZE-1);
 314                                 req.count = htons(strlen(getvar));
 315                                 DBG(printf("sending READVAR request...\n"));
 316                                 write(conn, &req, SIZEOF_NTPCM(req));
 317                                 DBG(print_ntp_control_message(&req));
 318
 319                                 do {
 320                                         req.count = htons(MAX_CM_SIZE);
 321                                         DBG(printf("receiving READVAR response...\n"));
 322                                         read(conn, &req, SIZEOF_NTPCM(req));
 323                                         DBG(print_ntp_control_message(&req));
 324                                 } while (!(req.op&OP_READVAR && ntohs(req.seq) == 2));
 325
 326                                 if(!(req.op&REM_ERROR))
 327                                         xasprintf(&data, "%s%s", data, req.data);
 328                         } while(req.op&REM_MORE);
 329
 330                         if(req.op&REM_ERROR) {
 331                                 if(strstr(getvar, "jitter")) {
 332                                         if(verbose) printf("The command failed. This is usually caused by servers refusing the 'jitter'\nvariable. Restarting with 'dispersion'...\n");
 333                                         getvar = "stratum,offset,dispersion";
 334                                         i--;
 335                                         continue;
 336                                 } else if(strlen(getvar)) {
 337                                         if(verbose) printf("Server didn't like dispersion either; will retrieve everything\n");
 338                                         getvar = "";
 339                                         i--;
 340                                         continue;
 341                                 }
 342                         }
 343
 344                         if(verbose > 1)
 345                                 printf("Server responded: >>>%s<<<\n", data);
 346
 347                         /* get the offset */
 348                         if(verbose)
 349                                 printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));
 350
 351                         value = np_extract_ntpvar(data, "offset");
 352                         nptr=NULL;
 353                         /* Convert the value if we have one */
 354                         if(value != NULL)
 355                                 tmp_offset = strtod(value, &nptr) / 1000;
 356                         /* If value is null or no conversion was performed */
 357                         if(value == NULL || value==nptr) {
 358                                 if(verbose) printf("error: unable to read server offset response.\n");
 359                         } else {
 360                                 if(verbose) printf("%.10g\n", tmp_offset);
 361                                 if(*offset_result == STATE_UNKNOWN || fabs(tmp_offset) < fabs(*offset)) {
 362                                         *offset = tmp_offset;
 363                                         *offset_result = STATE_OK;
 364                                 } else {
 365                                         /* Skip this one; move to the next */
 366                                         continue;
 367                                 }
 368                         }
 369
 370                         if(do_jitter) {
 371                                 /* get the jitter */
 372                                 if(verbose) {
 373                                         printf("parsing %s from peer %.2x: ", strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter", ntohs(peers[i].assoc));
 374                                 }
 375                                 value = np_extract_ntpvar(data, strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter");
 376                                 nptr=NULL;
 377                                 /* Convert the value if we have one */
 378                                 if(value != NULL)
 379                                         *jitter = strtod(value, &nptr);
 380                                 /* If value is null or no conversion was performed */
 381                                 if(value == NULL || value==nptr) {
 382                                         if(verbose) printf("error: unable to read server jitter/dispersion response.\n");
 383                                         *jitter = -1;
 384                                 } else if(verbose) {
 385                                         printf("%.10g\n", *jitter);
 386                                 }
 387                         }
 388
 389                         if(do_stratum) {
 390                                 /* get the stratum */
 391                                 if(verbose) {
 392                                         printf("parsing stratum from peer %.2x: ", ntohs(peers[i].assoc));
 393                                 }
 394                                 value = np_extract_ntpvar(data, "stratum");
 395                                 nptr=NULL;
 396                                 /* Convert the value if we have one */
 397                                 if(value != NULL)
 398                                         *stratum = strtol(value, &nptr, 10);
 399                                 if(value == NULL || value==nptr) {
 400                                         if(verbose) printf("error: unable to read server stratum response.\n");
 401                                         *stratum = -1;
 402                                 } else {
 403                                         if(verbose) printf("%i\n", *stratum);
 404                                 }
 405                         }
 406                 } /* if (PEER_SEL(peers[i].status) >= min_peer_sel) */
 407         } /* for (i = 0; i < npeers; i++) */
 408
 409         close(conn);
 410         if(peers!=NULL) free(peers);
 411
 412         return status;
 413 }
 414
 415 int process_arguments(int argc, char **argv){
 416         int c;
 417         int option=0;
 418         static struct option longopts[] = {
 419                 {"version", no_argument, 0, 'V'},
 420                 {"help", no_argument, 0, 'h'},
 421                 {"verbose", no_argument, 0, 'v'},
 422                 {"use-ipv4", no_argument, 0, '4'},
 423                 {"use-ipv6", no_argument, 0, '6'},
 424                 {"quiet", no_argument, 0, 'q'},
 425                 {"warning", required_argument, 0, 'w'},
 426                 {"critical", required_argument, 0, 'c'},
 427                 {"swarn", required_argument, 0, 'W'},
 428                 {"scrit", required_argument, 0, 'C'},
 429                 {"jwarn", required_argument, 0, 'j'},
 430                 {"jcrit", required_argument, 0, 'k'},
 431                 {"twarn", required_argument, 0, 'm'},
 432                 {"tcrit", required_argument, 0, 'n'},
 433                 {"timeout", required_argument, 0, 't'},
 434                 {"hostname", required_argument, 0, 'H'},
 435                 {"port", required_argument, 0, 'p'},
 436                 {0, 0, 0, 0}
 437         };
 438
 439
 440         if (argc < 2)
 441                 usage ("\n");
 442
 443         while (1) {
 444                 c = getopt_long (argc, argv, "Vhv46qw:c:W:C:j:k:m:n:t:H:p:", longopts, &option);
 445                 if (c == -1 || c == EOF || c == 1)
 446                         break;
 447
 448                 switch (c) {
 449                 case 'h':
 450                         print_help();
 451                         exit(STATE_OK);
 452                         break;
 453                 case 'V':
 454                         print_revision(progname, NP_VERSION);
 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 'm':
 488                         do_truechimers=1;
 489                         twarn = optarg;
 490                         break;
 491                 case 'n':
 492                         do_truechimers=1;
 493                         tcrit = optarg;
 494                         break;
 495                 case 'H':
 496                         if(is_host(optarg) == FALSE)
 497                                 usage2(_("Invalid hostname/address"), optarg);
 498                         server_address = strdup(optarg);
 499                         break;
 500                 case 'p':
 501                         port=atoi(optarg);
 502                         break;
 503                 case 't':
 504                         socket_timeout=atoi(optarg);
 505                         break;
 506                 case '4':
 507                         address_family = AF_INET;
 508                         break;
 509                 case '6':
 510 #ifdef USE_IPV6
 511                         address_family = AF_INET6;
 512 #else
 513                         usage4 (_("IPv6 support not available"));
 514 #endif
 515                         break;
 516                 case '?':
 517                         /* print short usage statement if args not parsable */
 518                         usage5 ();
 519                         break;
 520                 }
 521         }
 522
 523         if(server_address == NULL){
 524                 usage4(_("Hostname was not supplied"));
 525         }
 526
 527         return 0;
 528 }
 529
 530 char *perfd_offset (double offset)
 531 {
 532         return fperfdata ("offset", offset, "s",
 533                 TRUE, offset_thresholds->warning->end,
 534                 TRUE, offset_thresholds->critical->end,
 535                 FALSE, 0, FALSE, 0);
 536 }
 537
 538 char *perfd_jitter (double jitter)
 539 {
 540         return fperfdata ("jitter", jitter, "",
 541                 do_jitter, jitter_thresholds->warning->end,
 542                 do_jitter, jitter_thresholds->critical->end,
 543                 TRUE, 0, FALSE, 0);
 544 }
 545
 546 char *perfd_stratum (int stratum)
 547 {
 548         return perfdata ("stratum", stratum, "",
 549                 do_stratum, (int)stratum_thresholds->warning->end,
 550                 do_stratum, (int)stratum_thresholds->critical->end,
 551                 TRUE, 0, TRUE, 16);
 552 }
 553
 554 char *perfd_truechimers (int num_truechimers)
 555 {
 556         return perfdata ("truechimers", num_truechimers, "",
 557                 do_truechimers, (int)truechimer_thresholds->warning->end,
 558                 do_truechimers, (int)truechimer_thresholds->critical->end,
 559                 TRUE, 0, FALSE, 0);
 560 }
 561
 562 int main(int argc, char *argv[]){
 563         int result, offset_result, stratum, num_truechimers;
 564         double offset=0, jitter=0;
 565         char *result_line, *perfdata_line;
 566
 567         setlocale (LC_ALL, "");
 568         bindtextdomain (PACKAGE, LOCALEDIR);
 569         textdomain (PACKAGE);
 570
 571         /* Parse extra opts if any */
 572         argv=np_extra_opts (&argc, argv, progname);
 573
 574         if (process_arguments (argc, argv) == ERROR)
 575                 usage4 (_("Could not parse arguments"));
 576
 577         set_thresholds(&offset_thresholds, owarn, ocrit);
 578         set_thresholds(&jitter_thresholds, jwarn, jcrit);
 579         set_thresholds(&stratum_thresholds, swarn, scrit);
 580         set_thresholds(&truechimer_thresholds, twarn, tcrit);
 581
 582         /* initialize alarm signal handling */
 583         signal (SIGALRM, socket_timeout_alarm_handler);
 584
 585         /* set socket timeout */
 586         alarm (socket_timeout);
 587
 588         /* This returns either OK or WARNING (See comment preceeding ntp_request) */
 589         result = ntp_request(server_address, &offset, &offset_result, &jitter, &stratum, &num_truechimers);
 590
 591         if(offset_result == STATE_UNKNOWN) {
 592                 /* if there's no sync peer (this overrides ntp_request output): */
 593                 result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
 594         } else {
 595                 /* Be quiet if there's no candidates either */
 596                 if (quiet == 1 && result == STATE_WARNING)
 597                         result = STATE_UNKNOWN;
 598                 result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));
 599         }
 600
 601         if(do_truechimers)
 602                 result = max_state_alt(result, get_status(num_truechimers, truechimer_thresholds));
 603
 604         if(do_stratum)
 605                 result = max_state_alt(result, get_status(stratum, stratum_thresholds));
 606
 607         if(do_jitter)
 608                 result = max_state_alt(result, get_status(jitter, jitter_thresholds));
 609
 610         switch (result) {
 611                 case STATE_CRITICAL :
 612                         xasprintf(&result_line, _("NTP CRITICAL:"));
 613                         break;
 614                 case STATE_WARNING :
 615                         xasprintf(&result_line, _("NTP WARNING:"));
 616                         break;
 617                 case STATE_OK :
 618                         xasprintf(&result_line, _("NTP OK:"));
 619                         break;
 620                 default :
 621                         xasprintf(&result_line, _("NTP UNKNOWN:"));
 622                         break;
 623         }
 624         if(!syncsource_found)
 625                 xasprintf(&result_line, "%s %s,", result_line, _("Server not synchronized"));
 626         else if(li_alarm)
 627                 xasprintf(&result_line, "%s %s,", result_line, _("Server has the LI_ALARM bit set"));
 628
 629         if(offset_result == STATE_UNKNOWN){
 630                 xasprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
 631                 xasprintf(&perfdata_line, "");
 632         } else {
 633                 xasprintf(&result_line, "%s %s %.10g secs", result_line, _("Offset"), offset);
 634                 xasprintf(&perfdata_line, "%s", perfd_offset(offset));
 635         }
 636         if (do_jitter) {
 637                 xasprintf(&result_line, "%s, jitter=%f", result_line, jitter);
 638                 xasprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
 639         }
 640         if (do_stratum) {
 641                 xasprintf(&result_line, "%s, stratum=%i", result_line, stratum);
 642                 xasprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
 643         }
 644         if (do_truechimers) {
 645                 xasprintf(&result_line, "%s, truechimers=%i", result_line, num_truechimers);
 646                 xasprintf(&perfdata_line, "%s %s", perfdata_line, perfd_truechimers(num_truechimers));
 647         }
 648         printf("%s|%s\n", result_line, perfdata_line);
 649
 650         if(server_address!=NULL) free(server_address);
 651         return result;
 652 }
 653
 654
 655
 656 void print_help(void){
 657         print_revision(progname, NP_VERSION);
 658
 659         printf ("Copyright (c) 2006 Sean Finney\n");
 660         printf (COPYRIGHT, copyright, email);
 661
 662         printf ("%s\n", _("This plugin checks the selected ntp server"));
 663
 664         printf ("\n\n");
 665
 666         print_usage();
 667         printf (UT_HELP_VRSN);
 668         printf (UT_EXTRA_OPTS);
 669         printf (UT_IPv46);
 670         printf (UT_HOST_PORT, 'p', "123");
 671         printf (" %s\n", "-q, --quiet");
 672         printf ("    %s\n", _("Returns UNKNOWN instead of CRITICAL or WARNING if server isn't synchronized"));
 673         printf (" %s\n", "-w, --warning=THRESHOLD");
 674         printf ("    %s\n", _("Offset to result in warning status (seconds)"));
 675         printf (" %s\n", "-c, --critical=THRESHOLD");
 676         printf ("    %s\n", _("Offset to result in critical status (seconds)"));
 677         printf (" %s\n", "-W, --swarn=THRESHOLD");
 678         printf ("    %s\n", _("Warning threshold for stratum of server's synchronization peer"));
 679         printf (" %s\n", "-C, --scrit=THRESHOLD");
 680         printf ("    %s\n", _("Critical threshold for stratum of server's synchronization peer"));
 681         printf (" %s\n", "-j, --jwarn=THRESHOLD");
 682         printf ("    %s\n", _("Warning threshold for jitter"));
 683         printf (" %s\n", "-k, --jcrit=THRESHOLD");
 684         printf ("    %s\n", _("Critical threshold for jitter"));
 685         printf (" %s\n", "-m, --twarn=THRESHOLD");
 686         printf ("    %s\n", _("Warning threshold for number of usable time sources (\"truechimers\")"));
 687         printf (" %s\n", "-n, --tcrit=THRESHOLD");
 688         printf ("    %s\n", _("Critical threshold for number of usable time sources (\"truechimers\")"));
 689         printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 690         printf (UT_VERBOSE);
 691
 692         printf("\n");
 693         printf("%s\n", _("This plugin checks an NTP server independent of any commandline"));
 694         printf("%s\n\n", _("programs or external libraries."));
 695
 696         printf("%s\n", _("Notes:"));
 697         printf(" %s\n", _("Use this plugin to check the health of an NTP server. It supports"));
 698         printf(" %s\n", _("checking the offset with the sync peer, the jitter and stratum. This"));
 699         printf(" %s\n", _("plugin will not check the clock offset between the local host and NTP"));
 700         printf(" %s\n", _("server; please use check_ntp_time for that purpose."));
 701         printf("\n");
 702         printf(UT_THRESHOLDS_NOTES);
 703
 704         printf("\n");
 705         printf("%s\n", _("Examples:"));
 706         printf(" %s\n", _("Simple NTP server check:"));
 707         printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1"));
 708         printf("\n");
 709         printf(" %s\n", _("Check jitter too, avoiding critical notifications if jitter isn't available"));
 710         printf(" %s\n", _("(See Notes above for more details on thresholds formats):"));
 711         printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
 712         printf("\n");
 713         printf(" %s\n", _("Only check the number of usable time sources (\"truechimers\"):"));
 714         printf("  %s\n", ("./check_ntp_peer -H ntpserv -m @5 -n @3"));
 715         printf("\n");
 716         printf(" %s\n", _("Check only stratum:"));
 717         printf("  %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));
 718
 719         printf (UT_SUPPORT);
 720 }
 721
 722 void
 723 print_usage(void)
 724 {
 725         printf ("%s\n", _("Usage:"));
 726         printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
 727         printf("       [-j <warn>] [-k <crit>] [-v verbose]\n");
 728 }