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 port=123;
  52 static int verbose=0;
  53 static int quiet=0;
  54 static short do_offset=0;
  55 static char *owarn="60";
  56 static char *ocrit="120";
  57 static short do_stratum=0;
  58 static char *swarn="-1:16";
  59 static char *scrit="-1:16";
  60 static short do_jitter=0;
  61 static char *jwarn="-1:5000";
  62 static char *jcrit="-1:10000";
  63 static int syncsource_found=0;
  64 static int li_alarm=0;
  65
  66 int process_arguments (int, char **);
  67 thresholds *offset_thresholds = NULL;
  68 thresholds *jitter_thresholds = NULL;
  69 thresholds *stratum_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_INCLUDED 0x04
 129 #define PEER_SYNCSOURCE 0x06
 130
 131 /* NTP control message header is 12 bytes, plus any data in the data
 132  * field, plus null padding to the nearest 32-bit boundary per rfc.
 133  */
 134 #define SIZEOF_NTPCM(m) (12+ntohs(m.count)+((m.count)?4-(ntohs(m.count)%4):0))
 135
 136 /* finally, a little helper or two for debugging: */
 137 #define DBG(x) do{if(verbose>1){ x; }}while(0);
 138 #define PRINTSOCKADDR(x) \
 139         do{ \
 140                 printf("%u.%u.%u.%u", (x>>24)&0xff, (x>>16)&0xff, (x>>8)&0xff, x&0xff);\
 141         }while(0);
 142
 143 void print_ntp_control_message(const ntp_control_message *p){
 144         int i=0, numpeers=0;
 145         const ntp_assoc_status_pair *peer=NULL;
 146
 147         printf("control packet contents:\n");
 148         printf("\tflags: 0x%.2x , 0x%.2x\n", p->flags, p->op);
 149         printf("\t  li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
 150         printf("\t  vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
 151         printf("\t  mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
 152         printf("\t  response=%d (0x%.2x)\n", (p->op&REM_RESP)>0, p->op&REM_RESP);
 153         printf("\t  more=%d (0x%.2x)\n", (p->op&REM_MORE)>0, p->op&REM_MORE);
 154         printf("\t  error=%d (0x%.2x)\n", (p->op&REM_ERROR)>0, p->op&REM_ERROR);
 155         printf("\t  op=%d (0x%.2x)\n", p->op&OP_MASK, p->op&OP_MASK);
 156         printf("\tsequence: %d (0x%.2x)\n", ntohs(p->seq), ntohs(p->seq));
 157         printf("\tstatus: %d (0x%.2x)\n", ntohs(p->status), ntohs(p->status));
 158         printf("\tassoc: %d (0x%.2x)\n", ntohs(p->assoc), ntohs(p->assoc));
 159         printf("\toffset: %d (0x%.2x)\n", ntohs(p->offset), ntohs(p->offset));
 160         printf("\tcount: %d (0x%.2x)\n", ntohs(p->count), ntohs(p->count));
 161         numpeers=ntohs(p->count)/(sizeof(ntp_assoc_status_pair));
 162         if(p->op&REM_RESP && p->op&OP_READSTAT){
 163                 peer=(ntp_assoc_status_pair*)p->data;
 164                 for(i=0;i<numpeers;i++){
 165                         printf("\tpeer id %.2x status %.2x",
 166                                ntohs(peer[i].assoc), ntohs(peer[i].status));
 167                         if (PEER_SEL(peer[i].status) >= PEER_INCLUDED){
 168                                 if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
 169                                         printf(" <-- current sync source");
 170                                 } else {
 171                                         printf(" <-- current sync candidate");
 172                                 }
 173                         }
 174                         printf("\n");
 175                 }
 176         }
 177 }
 178
 179 /*
 180  * Extract the value from NTP key/value pairs, or return NULL.
 181  * The value returned can be free()ed.
 182  */
 183 char *extract_value(const char *varlist, const char *name){
 184         char *tmp=NULL, *value=NULL;
 185         int i;
 186
 187         while (1) {
 188                 /* Strip any leading space */
 189                 for (varlist; isspace(varlist[0]); varlist++);
 190
 191                 if (strncmp(name, varlist, strlen(name)) == 0) {
 192                         varlist += strlen(name);
 193                         /* strip trailing spaces */
 194                         for (varlist; isspace(varlist[0]); varlist++);
 195
 196                         if (varlist[0] == '=') {
 197                                 /* We matched the key, go past the = sign */
 198                                 varlist++;
 199                                 /* strip leading spaces */
 200                                 for (varlist; isspace(varlist[0]); varlist++);
 201
 202                                 if (tmp = index(varlist, ',')) {
 203                                         /* Value is delimited by a comma */
 204                                         if (tmp-varlist == 0) continue;
 205                                         value = (char *)malloc(tmp-varlist+1);
 206                                         strncpy(value, varlist, tmp-varlist);
 207                                         value[tmp-varlist] = '\0';
 208                                 } else {
 209                                         /* Value is delimited by a \0 */
 210                                         if (strlen(varlist) == 0) continue;
 211                                         value = (char *)malloc(strlen(varlist) + 1);
 212                                         strncpy(value, varlist, strlen(varlist));
 213                                         value[strlen(varlist)] = '\0';
 214                                 }
 215                                 break;
 216                         }
 217                 }
 218                 if (tmp = index(varlist, ',')) {
 219                         /* More keys, keep going... */
 220                         varlist = tmp + 1;
 221                 } else {
 222                         /* We're done */
 223                         break;
 224                 }
 225         }
 226
 227         /* Clean-up trailing spaces/newlines */
 228         if (value) for (i=strlen(value)-1; isspace(value[i]); i--) value[i] = '\0';
 229
 230         return value;
 231 }
 232
 233 void
 234 setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
 235         memset(p, 0, sizeof(ntp_control_message));
 236         LI_SET(p->flags, LI_NOWARNING);
 237         VN_SET(p->flags, VN_RESERVED);
 238         MODE_SET(p->flags, MODE_CONTROLMSG);
 239         OP_SET(p->op, opcode);
 240         p->seq = htons(seq);
 241         /* Remaining fields are zero for requests */
 242 }
 243
 244 /* This function does all the actual work; roughly here's what it does
 245  * beside setting the offest, jitter and stratum passed as argument:
 246  *  - offset can be negative, so if it cannot get the offset, offset_result
 247  *    is set to UNKNOWN, otherwise OK.
 248  *  - jitter and stratum are set to -1 if they cannot be retrieved so any
 249  *    positive value means a success retrieving the value.
 250  *  - status is set to WARNING if there's no sync.peer (otherwise OK) and is
 251  *    the return value of the function.
 252  *  status is pretty much useless as syncsource_found is a global variable
 253  *  used later in main to check is the server was synchronized. It works
 254  *  so I left it alone */
 255 int ntp_request(const char *host, double *offset, int *offset_result, double *jitter, int *stratum){
 256         int conn=-1, i, npeers=0, num_candidates=0;
 257         double tmp_offset = 0;
 258         int min_peer_sel=PEER_INCLUDED;
 259         int peers_size=0, peer_offset=0;
 260         int status;
 261         ntp_assoc_status_pair *peers=NULL;
 262         ntp_control_message req;
 263         const char *getvar = "stratum,offset,jitter";
 264         char *data, *value, *nptr;
 265         void *tmp;
 266
 267         status = STATE_OK;
 268         *offset_result = STATE_UNKNOWN;
 269         *jitter = *stratum = -1;
 270
 271         /* Long-winded explanation:
 272          * Getting the sync peer offset, jitter and stratum requires a number of
 273          * steps:
 274          * 1) Send a READSTAT request.
 275          * 2) Interpret the READSTAT reply
 276          *  a) The data section contains a list of peer identifiers (16 bits)
 277          *     and associated status words (16 bits)
 278          *  b) We want the value of 0x06 in the SEL (peer selection) value,
 279          *     which means "current synchronizatin source".  If that's missing,
 280          *     we take anything better than 0x04 (see the rfc for details) but
 281          *     set a minimum of warning.
 282          * 3) Send a READVAR request for information on each peer identified
 283          *    in 2b greater than the minimum selection value.
 284          * 4) Extract the offset, jitter and stratum value from the data[]
 285          *    (it's ASCII)
 286          */
 287         my_udp_connect(server_address, port, &conn);
 288
 289         /* keep sending requests until the server stops setting the
 290          * REM_MORE bit, though usually this is only 1 packet. */
 291         do{
 292                 setup_control_request(&req, OP_READSTAT, 1);
 293                 DBG(printf("sending READSTAT request"));
 294                 write(conn, &req, SIZEOF_NTPCM(req));
 295                 DBG(print_ntp_control_message(&req));
 296                 /* Attempt to read the largest size packet possible */
 297                 req.count=htons(MAX_CM_SIZE);
 298                 DBG(printf("recieving READSTAT response"))
 299                 if(read(conn, &req, SIZEOF_NTPCM(req)) == -1)
 300                         die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
 301                 DBG(print_ntp_control_message(&req));
 302                 /* discard obviously invalid packets */
 303                 if (ntohs(req.count) > MAX_CM_SIZE)
 304                         die(STATE_CRITICAL, "NTP CRITICAL: Invalid packet received from NTP server\n");
 305                 if (LI(req.flags) == LI_ALARM) li_alarm = 1;
 306                 /* Each peer identifier is 4 bytes in the data section, which
 307                  * we represent as a ntp_assoc_status_pair datatype.
 308                  */
 309                 peers_size+=ntohs(req.count);
 310                 if((tmp=realloc(peers, peers_size)) == NULL)
 311                         free(peers), die(STATE_UNKNOWN, "can not (re)allocate 'peers' buffer\n");
 312                 peers=tmp;
 313                 memcpy((void*)((ptrdiff_t)peers+peer_offset), (void*)req.data, ntohs(req.count));
 314                 npeers=peers_size/sizeof(ntp_assoc_status_pair);
 315                 peer_offset+=ntohs(req.count);
 316         } while(req.op&REM_MORE);
 317
 318         /* first, let's find out if we have a sync source, or if there are
 319          * at least some candidates. In the latter case we'll issue
 320          * a warning but go ahead with the check on them. */
 321         for (i = 0; i < npeers; i++){
 322                 if (PEER_SEL(peers[i].status) >= PEER_INCLUDED){
 323                         num_candidates++;
 324                         if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
 325                                 syncsource_found=1;
 326                                 min_peer_sel=PEER_SYNCSOURCE;
 327                         }
 328                 }
 329         }
 330         if(verbose) printf("%d candiate peers available\n", num_candidates);
 331         if(verbose && syncsource_found) printf("synchronization source found\n");
 332         if(! syncsource_found){
 333                 status = STATE_WARNING;
 334                 if(verbose) printf("warning: no synchronization source found\n");
 335         }
 336         if(li_alarm){
 337                 status = STATE_WARNING;
 338                 if(verbose) printf("warning: LI_ALARM bit is set\n");
 339         }
 340
 341
 342         for (i = 0; i < npeers; i++){
 343                 /* Only query this server if it is the current sync source */
 344                 /* If there's no sync.peer, query all candidates and use the best one */
 345                 if (PEER_SEL(peers[i].status) >= min_peer_sel){
 346                         if(verbose) printf("Getting offset, jitter and stratum for peer %.2x\n", ntohs(peers[i].assoc));
 347                         asprintf(&data, "");
 348                         do{
 349                                 setup_control_request(&req, OP_READVAR, 2);
 350                                 req.assoc = peers[i].assoc;
 351                                 /* Putting the wanted variable names in the request
 352                                  * cause the server to provide _only_ the requested values.
 353                                  * thus reducing net traffic, guaranteeing us only a single
 354                                  * datagram in reply, and making intepretation much simpler
 355                                  */
 356                                 /* Older servers doesn't know what jitter is, so if we get an
 357                                  * error on the first pass we redo it with "dispersion" */
 358                                 strncpy(req.data, getvar, MAX_CM_SIZE-1);
 359                                 req.count = htons(strlen(getvar));
 360                                 DBG(printf("sending READVAR request...\n"));
 361                                 write(conn, &req, SIZEOF_NTPCM(req));
 362                                 DBG(print_ntp_control_message(&req));
 363
 364                                 req.count = htons(MAX_CM_SIZE);
 365                                 DBG(printf("receiving READVAR response...\n"));
 366                                 read(conn, &req, SIZEOF_NTPCM(req));
 367                                 DBG(print_ntp_control_message(&req));
 368
 369                                 if(!(req.op&REM_ERROR))
 370                                         asprintf(&data, "%s%s", data, req.data);
 371                         } while(req.op&REM_MORE);
 372
 373                         if(req.op&REM_ERROR) {
 374                                 if(strstr(getvar, "jitter")) {
 375                                         if(verbose) printf("The command failed. This is usually caused by servers refusing the 'jitter'\nvariable. Restarting with 'dispersion'...\n");
 376                                         getvar = "stratum,offset,dispersion";
 377                                         i--;
 378                                         continue;
 379                                 } else if(strlen(getvar)) {
 380                                         if(verbose) printf("Server didn't like dispersion either; will retrieve everything\n");
 381                                         getvar = "";
 382                                         i--;
 383                                         continue;
 384                                 }
 385                         }
 386
 387                         if(verbose > 1)
 388                                 printf("Server responded: >>>%s<<<\n", data);
 389
 390                         /* get the offset */
 391                         if(verbose)
 392                                 printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));
 393
 394                         value = extract_value(data, "offset");
 395                         nptr=NULL;
 396                         /* Convert the value if we have one */
 397                         if(value != NULL)
 398                                 tmp_offset = strtod(value, &nptr) / 1000;
 399                         /* If value is null or no conversion was performed */
 400                         if(value == NULL || value==nptr) {
 401                                 if(verbose) printf("error: unable to read server offset response.\n");
 402                         } else {
 403                                 if(verbose) printf("%.10g\n", tmp_offset);
 404                                 if(*offset_result == STATE_UNKNOWN || fabs(tmp_offset) < fabs(*offset)) {
 405                                         *offset = tmp_offset;
 406                                         *offset_result = STATE_OK;
 407                                 } else {
 408                                         /* Skip this one; move to the next */
 409                                         continue;
 410                                 }
 411                         }
 412
 413                         if(do_jitter) {
 414                                 /* get the jitter */
 415                                 if(verbose) {
 416                                         printf("parsing %s from peer %.2x: ", strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter", ntohs(peers[i].assoc));
 417                                 }
 418                                 value = extract_value(data, strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter");
 419                                 nptr=NULL;
 420                                 /* Convert the value if we have one */
 421                                 if(value != NULL)
 422                                         *jitter = strtod(value, &nptr);
 423                                 /* If value is null or no conversion was performed */
 424                                 if(value == NULL || value==nptr) {
 425                                         if(verbose) printf("error: unable to read server jitter/dispersion response.\n");
 426                                         *jitter = -1;
 427                                 } else if(verbose) {
 428                                         printf("%.10g\n", *jitter);
 429                                 }
 430                         }
 431
 432                         if(do_stratum) {
 433                                 /* get the stratum */
 434                                 if(verbose) {
 435                                         printf("parsing stratum from peer %.2x: ", ntohs(peers[i].assoc));
 436                                 }
 437                                 value = extract_value(data, "stratum");
 438                                 nptr=NULL;
 439                                 /* Convert the value if we have one */
 440                                 if(value != NULL)
 441                                         *stratum = strtol(value, &nptr, 10);
 442                                 if(value == NULL || value==nptr) {
 443                                         if(verbose) printf("error: unable to read server stratum response.\n");
 444                                         *stratum = -1;
 445                                 } else {
 446                                         if(verbose) printf("%i\n", *stratum);
 447                                 }
 448                         }
 449                 } /* if (PEER_SEL(peers[i].status) >= min_peer_sel) */
 450         } /* for (i = 0; i < npeers; i++) */
 451
 452         close(conn);
 453         if(peers!=NULL) free(peers);
 454
 455         return status;
 456 }
 457
 458 int process_arguments(int argc, char **argv){
 459         int c;
 460         int option=0;
 461         static struct option longopts[] = {
 462                 {"version", no_argument, 0, 'V'},
 463                 {"help", no_argument, 0, 'h'},
 464                 {"verbose", no_argument, 0, 'v'},
 465                 {"use-ipv4", no_argument, 0, '4'},
 466                 {"use-ipv6", no_argument, 0, '6'},
 467                 {"quiet", no_argument, 0, 'q'},
 468                 {"warning", required_argument, 0, 'w'},
 469                 {"critical", required_argument, 0, 'c'},
 470                 {"swarn", required_argument, 0, 'W'},
 471                 {"scrit", required_argument, 0, 'C'},
 472                 {"jwarn", required_argument, 0, 'j'},
 473                 {"jcrit", required_argument, 0, 'k'},
 474                 {"timeout", required_argument, 0, 't'},
 475                 {"hostname", required_argument, 0, 'H'},
 476                 {"port", required_argument, 0, 'p'},
 477                 {0, 0, 0, 0}
 478         };
 479
 480
 481         if (argc < 2)
 482                 usage ("\n");
 483
 484         while (1) {
 485                 c = getopt_long (argc, argv, "Vhv46qw:c:W:C:j:k:t:H:p:", longopts, &option);
 486                 if (c == -1 || c == EOF || c == 1)
 487                         break;
 488
 489                 switch (c) {
 490                 case 'h':
 491                         print_help();
 492                         exit(STATE_OK);
 493                         break;
 494                 case 'V':
 495                         print_revision(progname, revision);
 496                         exit(STATE_OK);
 497                         break;
 498                 case 'v':
 499                         verbose++;
 500                         break;
 501                 case 'q':
 502                         quiet = 1;
 503                         break;
 504                 case 'w':
 505                         do_offset=1;
 506                         owarn = optarg;
 507                         break;
 508                 case 'c':
 509                         do_offset=1;
 510                         ocrit = optarg;
 511                         break;
 512                 case 'W':
 513                         do_stratum=1;
 514                         swarn = optarg;
 515                         break;
 516                 case 'C':
 517                         do_stratum=1;
 518                         scrit = optarg;
 519                         break;
 520                 case 'j':
 521                         do_jitter=1;
 522                         jwarn = optarg;
 523                         break;
 524                 case 'k':
 525                         do_jitter=1;
 526                         jcrit = optarg;
 527                         break;
 528                 case 'H':
 529                         if(is_host(optarg) == FALSE)
 530                                 usage2(_("Invalid hostname/address"), optarg);
 531                         server_address = strdup(optarg);
 532                         break;
 533                 case 'p':
 534                         port=atoi(optarg);
 535                         break;
 536                 case 't':
 537                         socket_timeout=atoi(optarg);
 538                         break;
 539                 case '4':
 540                         address_family = AF_INET;
 541                         break;
 542                 case '6':
 543 #ifdef USE_IPV6
 544                         address_family = AF_INET6;
 545 #else
 546                         usage4 (_("IPv6 support not available"));
 547 #endif
 548                         break;
 549                 case '?':
 550                         /* print short usage statement if args not parsable */
 551                         usage5 ();
 552                         break;
 553                 }
 554         }
 555
 556         if(server_address == NULL){
 557                 usage4(_("Hostname was not supplied"));
 558         }
 559
 560         return 0;
 561 }
 562
 563 char *perfd_offset (double offset)
 564 {
 565         return fperfdata ("offset", offset, "s",
 566                 TRUE, offset_thresholds->warning->end,
 567                 TRUE, offset_thresholds->critical->end,
 568                 FALSE, 0, FALSE, 0);
 569 }
 570
 571 char *perfd_jitter (double jitter)
 572 {
 573         return fperfdata ("jitter", jitter, "",
 574                 do_jitter, jitter_thresholds->warning->end,
 575                 do_jitter, jitter_thresholds->critical->end,
 576                 TRUE, 0, FALSE, 0);
 577 }
 578
 579 char *perfd_stratum (int stratum)
 580 {
 581         return perfdata ("stratum", stratum, "",
 582                 do_stratum, (int)stratum_thresholds->warning->end,
 583                 do_stratum, (int)stratum_thresholds->critical->end,
 584                 TRUE, 0, TRUE, 16);
 585 }
 586
 587 int main(int argc, char *argv[]){
 588         int result, offset_result, stratum;
 589         double offset=0, jitter=0;
 590         char *result_line, *perfdata_line;
 591
 592         setlocale (LC_ALL, "");
 593         bindtextdomain (PACKAGE, LOCALEDIR);
 594         textdomain (PACKAGE);
 595
 596         /* Parse extra opts if any */
 597         argv=np_extra_opts (&argc, argv, progname);
 598
 599         if (process_arguments (argc, argv) == ERROR)
 600                 usage4 (_("Could not parse arguments"));
 601
 602         set_thresholds(&offset_thresholds, owarn, ocrit);
 603         set_thresholds(&jitter_thresholds, jwarn, jcrit);
 604         set_thresholds(&stratum_thresholds, swarn, scrit);
 605
 606         /* initialize alarm signal handling */
 607         signal (SIGALRM, socket_timeout_alarm_handler);
 608
 609         /* set socket timeout */
 610         alarm (socket_timeout);
 611
 612         /* This returns either OK or WARNING (See comment preceeding ntp_request) */
 613         result = ntp_request(server_address, &offset, &offset_result, &jitter, &stratum);
 614
 615         if(offset_result == STATE_UNKNOWN) {
 616                 /* if there's no sync peer (this overrides ntp_request output): */
 617                 result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
 618         } else {
 619                 /* Be quiet if there's no candidates either */
 620                 if (quiet == 1 && result == STATE_WARNING)
 621                         result = STATE_UNKNOWN;
 622                 result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));
 623         }
 624
 625         if(do_stratum)
 626                 result = max_state_alt(result, get_status(stratum, stratum_thresholds));
 627
 628         if(do_jitter)
 629                 result = max_state_alt(result, get_status(jitter, jitter_thresholds));
 630
 631         switch (result) {
 632                 case STATE_CRITICAL :
 633                         asprintf(&result_line, _("NTP CRITICAL:"));
 634                         break;
 635                 case STATE_WARNING :
 636                         asprintf(&result_line, _("NTP WARNING:"));
 637                         break;
 638                 case STATE_OK :
 639                         asprintf(&result_line, _("NTP OK:"));
 640                         break;
 641                 default :
 642                         asprintf(&result_line, _("NTP UNKNOWN:"));
 643                         break;
 644         }
 645         if(!syncsource_found)
 646                 asprintf(&result_line, "%s %s,", result_line, _("Server not synchronized"));
 647         else if(li_alarm)
 648                 asprintf(&result_line, "%s %s,", result_line, _("Server has the LI_ALARM bit set"));
 649
 650         if(offset_result == STATE_UNKNOWN){
 651                 asprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
 652                 asprintf(&perfdata_line, "");
 653         } else {
 654                 asprintf(&result_line, "%s %s %.10g secs", result_line, _("Offset"), offset);
 655                 asprintf(&perfdata_line, "%s", perfd_offset(offset));
 656         }
 657         if (do_jitter) {
 658                 asprintf(&result_line, "%s, jitter=%f", result_line, jitter);
 659                 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
 660         }
 661         if (do_stratum) {
 662                 asprintf(&result_line, "%s, stratum=%i", result_line, stratum);
 663                 asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
 664         }
 665         printf("%s|%s\n", result_line, perfdata_line);
 666
 667         if(server_address!=NULL) free(server_address);
 668         return result;
 669 }
 670
 671
 672
 673 void print_help(void){
 674         print_revision(progname, revision);
 675
 676         printf ("Copyright (c) 2006 Sean Finney\n");
 677         printf (COPYRIGHT, copyright, email);
 678
 679         printf ("%s\n", _("This plugin checks the selected ntp server"));
 680
 681         printf ("\n\n");
 682
 683         print_usage();
 684         printf (_(UT_HELP_VRSN));
 685         printf (_(UT_EXTRA_OPTS));
 686         printf (_(UT_HOST_PORT), 'p', "123");
 687         printf (" %s\n", "-q, --quiet");
 688         printf ("    %s\n", _("Returns UNKNOWN instead of CRITICAL or WARNING if server isn't synchronized"));
 689         printf (" %s\n", "-w, --warning=THRESHOLD");
 690         printf ("    %s\n", _("Offset to result in warning status (seconds)"));
 691         printf (" %s\n", "-c, --critical=THRESHOLD");
 692         printf ("    %s\n", _("Offset to result in critical status (seconds)"));
 693         printf (" %s\n", "-W, --swarn=THRESHOLD");
 694         printf ("    %s\n", _("Warning threshold for stratum"));
 695         printf (" %s\n", "-C, --scrit=THRESHOLD");
 696         printf ("    %s\n", _("Critical threshold for stratum"));
 697         printf (" %s\n", "-j, --jwarn=THRESHOLD");
 698         printf ("    %s\n", _("Warning threshold for jitter"));
 699         printf (" %s\n", "-k, --jcrit=THRESHOLD");
 700         printf ("    %s\n", _("Critical threshold for jitter"));
 701         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 702         printf (_(UT_VERBOSE));
 703
 704         printf("\n");
 705         printf("%s\n", _("This plugin checks an NTP server independent of any commandline"));
 706         printf("%s\n\n", _("programs or external libraries."));
 707
 708         printf("%s\n", _("Notes:"));
 709         printf(" %s\n", _("Use this plugin to check the health of an NTP server. It supports"));
 710         printf(" %s\n", _("checking the offset with the sync peer, the jitter and stratum. This"));
 711         printf(" %s\n", _("plugin will not check the clock offset between the local host and NTP"));
 712         printf(" %s\n", _("server; please use check_ntp_time for that purpose."));
 713         printf("\n");
 714         printf(_(UT_THRESHOLDS_NOTES));
 715 #ifdef NP_EXTRA_OPTS
 716         printf("\n");
 717         printf(_(UT_EXTRA_OPTS_NOTES));
 718 #endif
 719
 720         printf("\n");
 721         printf("%s\n", _("Examples:"));
 722         printf(" %s\n", _("Simple NTP server check:"));
 723         printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1"));
 724         printf("\n");
 725         printf(" %s\n", _("Check jitter too, avoiding critical notifications if jitter isn't available"));
 726         printf(" %s\n", _("(See Notes above for more details on thresholds formats):"));
 727         printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
 728         printf("\n");
 729         printf(" %s\n", _("Check only stratum:"));
 730         printf("  %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));
 731
 732         printf (_(UT_SUPPORT));
 733 }
 734
 735 void
 736 print_usage(void)
 737 {
 738         printf (_("Usage:"));
 739         printf(" %s -H <host> [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
 740         printf("       [-j <warn>] [-k <crit>] [-v verbose]\n");
 741 }