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* Nagios check_ntp_peer plugin
* License: GPL
* Copyright (c) 2006 Sean Finney <seanius@seanius.net>
* Copyright (c) 2006-2008 Nagios Plugins Development Team
* Description:
* This file contains the check_ntp_peer plugin
* This plugin checks an NTP server independent of any commandline
* programs or external libraries.
* Use this plugin to check the health of an NTP server. It supports
* checking the offset with the sync peer, the jitter and stratum. This
* plugin will not check the clock offset between the local host and NTP
* server; please use check_ntp_time for that purpose.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.

const char *progname = "check_ntp_peer";
const char *copyright = "2006-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "netutils.h"
#include "utils.h"

static char *server_address=NULL;
static int port=123;
static int verbose=0;
static int quiet=0;
static short do_offset=0;
static char *owarn="60";
static char *ocrit="120";
static short do_stratum=0;
static char *swarn="-1:16";
static char *scrit="-1:16";
static short do_jitter=0;
static char *jwarn="-1:5000";
static char *jcrit="-1:10000";
static short do_truechimers=0;
static char *twarn="0:";
static char *tcrit="0:";
static int syncsource_found=0;
static int li_alarm=0;

int process_arguments (int, char **);
thresholds *offset_thresholds = NULL;
thresholds *jitter_thresholds = NULL;
thresholds *stratum_thresholds = NULL;
thresholds *truechimer_thresholds = NULL;
void print_help (void);
void print_usage (void);

/* max size of control message data */
#define MAX_CM_SIZE 468

/* this structure holds everything in an ntp control message as per rfc1305 */
typedef struct {
      uint8_t flags;       /* byte with leapindicator,vers,mode. see macros */
      uint8_t op;          /* R,E,M bits and Opcode */
      uint16_t seq;        /* Packet sequence */
      uint16_t status;     /* Clock status */
      uint16_t assoc;      /* Association */
      uint16_t offset;     /* Similar to TCP sequence # */
      uint16_t count;      /* # bytes of data */
      char data[MAX_CM_SIZE]; /* ASCII data of the request */
                              /* NB: not necessarily NULL terminated! */
} ntp_control_message;

/* this is an association/status-word pair found in control packet reponses */
typedef struct {
      uint16_t assoc;
      uint16_t status;
} ntp_assoc_status_pair;

/* bits 1,2 are the leap indicator */
#define LI_MASK 0xc0
#define LI(x) ((x&LI_MASK)>>6)
#define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
/* and these are the values of the leap indicator */
#define LI_NOWARNING 0x00
#define LI_EXTRASEC 0x01
#define LI_MISSINGSEC 0x02
#define LI_ALARM 0x03
/* bits 3,4,5 are the ntp version */
#define VN_MASK 0x38
#define VN(x)     ((x&VN_MASK)>>3)
#define VN_SET(x,y)     do{ x |= ((y<<3)&VN_MASK); }while(0)
#define VN_RESERVED 0x02
/* bits 6,7,8 are the ntp mode */
#define MODE_MASK 0x07
#define MODE(x) (x&MODE_MASK)
#define MODE_SET(x,y)   do{ x |= (y&MODE_MASK); }while(0)
/* here are some values */
#define MODE_CLIENT 0x03
#define MODE_CONTROLMSG 0x06
/* In control message, bits 8-10 are R,E,M bits */
#define REM_MASK 0xe0
#define REM_RESP 0x80
#define REM_ERROR 0x40
#define REM_MORE 0x20
/* In control message, bits 11 - 15 are opcode */
#define OP_MASK 0x1f
#define OP_SET(x,y)   do{ x |= (y&OP_MASK); }while(0)
#define OP_READSTAT 0x01
#define OP_READVAR  0x02
/* In peer status bytes, bits 6,7,8 determine clock selection status */
#define PEER_SEL(x) ((ntohs(x)>>8)&0x07)
#define PEER_TRUECHIMER 0x02
#define PEER_INCLUDED 0x04
#define PEER_SYNCSOURCE 0x06

/* NTP control message header is 12 bytes, plus any data in the data
 * field, plus null padding to the nearest 32-bit boundary per rfc.
#define SIZEOF_NTPCM(m) (12+ntohs(m.count)+((ntohs(m.count)%4)?4-(ntohs(m.count)%4):0))

/* finally, a little helper or two for debugging: */
#define DBG(x) do{if(verbose>1){ x; }}while(0);
#define PRINTSOCKADDR(x) \
      do{ \
            printf("%u.%u.%u.%u", (x>>24)&0xff, (x>>16)&0xff, (x>>8)&0xff, x&0xff);\

void print_ntp_control_message(const ntp_control_message *p){
      int i=0, numpeers=0;
      const ntp_assoc_status_pair *peer=NULL;

      printf("control packet contents:\n");
      printf("\tflags: 0x%.2x , 0x%.2x\n", p->flags, p->op);
      printf("\t  li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
      printf("\t  vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
      printf("\t  mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
      printf("\t  response=%d (0x%.2x)\n", (p->op&REM_RESP)>0, p->op&REM_RESP);
      printf("\t  more=%d (0x%.2x)\n", (p->op&REM_MORE)>0, p->op&REM_MORE);
      printf("\t  error=%d (0x%.2x)\n", (p->op&REM_ERROR)>0, p->op&REM_ERROR);
      printf("\t  op=%d (0x%.2x)\n", p->op&OP_MASK, p->op&OP_MASK);
      printf("\tsequence: %d (0x%.2x)\n", ntohs(p->seq), ntohs(p->seq));
      printf("\tstatus: %d (0x%.2x)\n", ntohs(p->status), ntohs(p->status));
      printf("\tassoc: %d (0x%.2x)\n", ntohs(p->assoc), ntohs(p->assoc));
      printf("\toffset: %d (0x%.2x)\n", ntohs(p->offset), ntohs(p->offset));
      printf("\tcount: %d (0x%.2x)\n", ntohs(p->count), ntohs(p->count));
      if(p->op&REM_RESP && p->op&OP_READSTAT){
                  printf("\tpeer id %.2x status %.2x",
                         ntohs(peer[i].assoc), ntohs(peer[i].status));
                  if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
                        printf(" <-- current sync source");
                  } else if(PEER_SEL(peer[i].status) >= PEER_INCLUDED){
                        printf(" <-- current sync candidate");
                  } else if(PEER_SEL(peer[i].status) >= PEER_TRUECHIMER){
                        printf(" <-- outlyer, but truechimer");

setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
      memset(p, 0, sizeof(ntp_control_message));
      LI_SET(p->flags, LI_NOWARNING);
      VN_SET(p->flags, VN_RESERVED);
      MODE_SET(p->flags, MODE_CONTROLMSG);
      OP_SET(p->op, opcode);
      p->seq = htons(seq);
      /* Remaining fields are zero for requests */

/* This function does all the actual work; roughly here's what it does
 * beside setting the offest, jitter and stratum passed as argument:
 *  - offset can be negative, so if it cannot get the offset, offset_result
 *    is set to UNKNOWN, otherwise OK.
 *  - jitter and stratum are set to -1 if they cannot be retrieved so any
 *    positive value means a success retrieving the value.
 *  - status is set to WARNING if there's no sync.peer (otherwise OK) and is
 *    the return value of the function.
 *  status is pretty much useless as syncsource_found is a global variable
 *  used later in main to check is the server was synchronized. It works
 *  so I left it alone */
int ntp_request(const char *host, double *offset, int *offset_result, double *jitter, int *stratum, int *num_truechimers){
      int conn=-1, i, npeers=0, num_candidates=0;
      double tmp_offset = 0;
      int min_peer_sel=PEER_INCLUDED;
      int peers_size=0, peer_offset=0;
      int status;
      ntp_assoc_status_pair *peers=NULL;
      ntp_control_message req;
      const char *getvar = "stratum,offset,jitter";
      char *data, *value, *nptr;
      void *tmp;

      status = STATE_OK;
      *offset_result = STATE_UNKNOWN;
      *jitter = *stratum = -1;
      *num_truechimers = 0;

      /* Long-winded explanation:
       * Getting the sync peer offset, jitter and stratum requires a number of
       * steps:
       * 1) Send a READSTAT request.
       * 2) Interpret the READSTAT reply
       *  a) The data section contains a list of peer identifiers (16 bits)
       *     and associated status words (16 bits)
       *  b) We want the value of 0x06 in the SEL (peer selection) value,
       *     which means "current synchronizatin source".  If that's missing,
       *     we take anything better than 0x04 (see the rfc for details) but
       *     set a minimum of warning.
       * 3) Send a READVAR request for information on each peer identified
       *    in 2b greater than the minimum selection value.
       * 4) Extract the offset, jitter and stratum value from the data[]
       *    (it's ASCII)
      my_udp_connect(server_address, port, &conn);

      /* keep sending requests until the server stops setting the
       * REM_MORE bit, though usually this is only 1 packet. */
            setup_control_request(&req, OP_READSTAT, 1);
            DBG(printf("sending READSTAT request"));
            write(conn, &req, SIZEOF_NTPCM(req));
            /* Attempt to read the largest size packet possible */
            DBG(printf("recieving READSTAT response"))
            if(read(conn, &req, SIZEOF_NTPCM(req)) == -1)
                  die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
            /* discard obviously invalid packets */
            if (ntohs(req.count) > MAX_CM_SIZE)
                  die(STATE_CRITICAL, "NTP CRITICAL: Invalid packet received from NTP server\n");
            if (LI(req.flags) == LI_ALARM) li_alarm = 1;
            /* Each peer identifier is 4 bytes in the data section, which
             * we represent as a ntp_assoc_status_pair datatype.
            if((tmp=realloc(peers, peers_size)) == NULL)
                  free(peers), die(STATE_UNKNOWN, "can not (re)allocate 'peers' buffer\n");
            memcpy((void*)((ptrdiff_t)peers+peer_offset), (void*)req.data, ntohs(req.count));
      } while(req.op&REM_MORE);

      /* first, let's find out if we have a sync source, or if there are
       * at least some candidates. In the latter case we'll issue
       * a warning but go ahead with the check on them. */
      for (i = 0; i < npeers; i++){
            if(PEER_SEL(peers[i].status) >= PEER_TRUECHIMER){
                  if(PEER_SEL(peers[i].status) >= PEER_INCLUDED){
                        if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
      if(verbose) printf("%d candidate peers available\n", num_candidates);
      if(verbose && syncsource_found) printf("synchronization source found\n");
      if(! syncsource_found){
            status = STATE_WARNING;
            if(verbose) printf("warning: no synchronization source found\n");
            status = STATE_WARNING;
            if(verbose) printf("warning: LI_ALARM bit is set\n");

      for (i = 0; i < npeers; i++){
            /* Only query this server if it is the current sync source */
            /* If there's no sync.peer, query all candidates and use the best one */
            if (PEER_SEL(peers[i].status) >= min_peer_sel){
                  if(verbose) printf("Getting offset, jitter and stratum for peer %.2x\n", ntohs(peers[i].assoc));
                  asprintf(&data, "");
                        setup_control_request(&req, OP_READVAR, 2);
                        req.assoc = peers[i].assoc;
                        /* Putting the wanted variable names in the request
                         * cause the server to provide _only_ the requested values.
                         * thus reducing net traffic, guaranteeing us only a single
                         * datagram in reply, and making intepretation much simpler
                        /* Older servers doesn't know what jitter is, so if we get an
                         * error on the first pass we redo it with "dispersion" */
                        strncpy(req.data, getvar, MAX_CM_SIZE-1);
                        req.count = htons(strlen(getvar));
                        DBG(printf("sending READVAR request...\n"));
                        write(conn, &req, SIZEOF_NTPCM(req));

                        req.count = htons(MAX_CM_SIZE);
                        DBG(printf("receiving READVAR response...\n"));
                        read(conn, &req, SIZEOF_NTPCM(req));

                              asprintf(&data, "%s%s", data, req.data);
                  } while(req.op&REM_MORE);

                  if(req.op&REM_ERROR) {
                        if(strstr(getvar, "jitter")) {
                              if(verbose) printf("The command failed. This is usually caused by servers refusing the 'jitter'\nvariable. Restarting with 'dispersion'...\n");
                              getvar = "stratum,offset,dispersion";
                        } else if(strlen(getvar)) {
                              if(verbose) printf("Server didn't like dispersion either; will retrieve everything\n");
                              getvar = "";

                  if(verbose > 1)
                        printf("Server responded: >>>%s<<<\n", data);

                  /* get the offset */
                        printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));

                  value = np_extract_ntpvar(data, "offset");
                  /* Convert the value if we have one */
                  if(value != NULL)
                        tmp_offset = strtod(value, &nptr) / 1000;
                  /* If value is null or no conversion was performed */
                  if(value == NULL || value==nptr) {
                        if(verbose) printf("error: unable to read server offset response.\n");
                  } else {
                        if(verbose) printf("%.10g\n", tmp_offset);
                        if(*offset_result == STATE_UNKNOWN || fabs(tmp_offset) < fabs(*offset)) {
                              *offset = tmp_offset;
                              *offset_result = STATE_OK;
                        } else {
                              /* Skip this one; move to the next */

                  if(do_jitter) {
                        /* get the jitter */
                        if(verbose) {
                              printf("parsing %s from peer %.2x: ", strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter", ntohs(peers[i].assoc));
                        value = np_extract_ntpvar(data, strstr(getvar, "dispersion") != NULL ? "dispersion" : "jitter");
                        /* Convert the value if we have one */
                        if(value != NULL)
                              *jitter = strtod(value, &nptr);
                        /* If value is null or no conversion was performed */
                        if(value == NULL || value==nptr) {
                              if(verbose) printf("error: unable to read server jitter/dispersion response.\n");
                              *jitter = -1;
                        } else if(verbose) {
                              printf("%.10g\n", *jitter);

                  if(do_stratum) {
                        /* get the stratum */
                        if(verbose) {
                              printf("parsing stratum from peer %.2x: ", ntohs(peers[i].assoc));
                        value = np_extract_ntpvar(data, "stratum");
                        /* Convert the value if we have one */
                        if(value != NULL)
                              *stratum = strtol(value, &nptr, 10);
                        if(value == NULL || value==nptr) {
                              if(verbose) printf("error: unable to read server stratum response.\n");
                              *stratum = -1;
                        } else {
                              if(verbose) printf("%i\n", *stratum);
            } /* if (PEER_SEL(peers[i].status) >= min_peer_sel) */
      } /* for (i = 0; i < npeers; i++) */

      if(peers!=NULL) free(peers);

      return status;

int process_arguments(int argc, char **argv){
      int c;
      int option=0;
      static struct option longopts[] = {
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {"verbose", no_argument, 0, 'v'},
            {"use-ipv4", no_argument, 0, '4'},
            {"use-ipv6", no_argument, 0, '6'},
            {"quiet", no_argument, 0, 'q'},
            {"warning", required_argument, 0, 'w'},
            {"critical", required_argument, 0, 'c'},
            {"swarn", required_argument, 0, 'W'},
            {"scrit", required_argument, 0, 'C'},
            {"jwarn", required_argument, 0, 'j'},
            {"jcrit", required_argument, 0, 'k'},
            {"twarn", required_argument, 0, 'm'},
            {"tcrit", required_argument, 0, 'n'},
            {"timeout", required_argument, 0, 't'},
            {"hostname", required_argument, 0, 'H'},
            {"port", required_argument, 0, 'p'},
            {0, 0, 0, 0}

      if (argc < 2)
            usage ("\n");

      while (1) {
            c = getopt_long (argc, argv, "Vhv46qw:c:W:C:j:k:m:n:t:H:p:", longopts, &option);
            if (c == -1 || c == EOF || c == 1)

            switch (c) {
            case 'h':
            case 'V':
                  print_revision(progname, NP_VERSION);
            case 'v':
            case 'q':
                  quiet = 1;
            case 'w':
                  owarn = optarg;
            case 'c':
                  ocrit = optarg;
            case 'W':
                  swarn = optarg;
            case 'C':
                  scrit = optarg;
            case 'j':
                  jwarn = optarg;
            case 'k':
                  jcrit = optarg;
            case 'm':
                  twarn = optarg;
            case 'n':
                  tcrit = optarg;
            case 'H':
                  if(is_host(optarg) == FALSE)
                        usage2(_("Invalid hostname/address"), optarg);
                  server_address = strdup(optarg);
            case 'p':
            case 't':
            case '4':
                  address_family = AF_INET;
            case '6':
#ifdef USE_IPV6
                  address_family = AF_INET6;
                  usage4 (_("IPv6 support not available"));
            case '?':
                  /* print short usage statement if args not parsable */
                  usage5 ();

      if(server_address == NULL){
            usage4(_("Hostname was not supplied"));

      return 0;

char *perfd_offset (double offset)
      return fperfdata ("offset", offset, "s",
            TRUE, offset_thresholds->warning->end,
            TRUE, offset_thresholds->critical->end,
            FALSE, 0, FALSE, 0);

char *perfd_jitter (double jitter)
      return fperfdata ("jitter", jitter, "",
            do_jitter, jitter_thresholds->warning->end,
            do_jitter, jitter_thresholds->critical->end,
            TRUE, 0, FALSE, 0);

char *perfd_stratum (int stratum)
      return perfdata ("stratum", stratum, "",
            do_stratum, (int)stratum_thresholds->warning->end,
            do_stratum, (int)stratum_thresholds->critical->end,
            TRUE, 0, TRUE, 16);

char *perfd_truechimers (int num_truechimers)
      return perfdata ("truechimers", num_truechimers, "",
            do_truechimers, (int)truechimer_thresholds->warning->end,
            do_truechimers, (int)truechimer_thresholds->critical->end,
            TRUE, 0, FALSE, 0);

int main(int argc, char *argv[]){
      int result, offset_result, stratum, num_truechimers;
      double offset=0, jitter=0;
      char *result_line, *perfdata_line;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      /* Parse extra opts if any */
      argv=np_extra_opts (&argc, argv, progname);

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

      set_thresholds(&offset_thresholds, owarn, ocrit);
      set_thresholds(&jitter_thresholds, jwarn, jcrit);
      set_thresholds(&stratum_thresholds, swarn, scrit);
      set_thresholds(&truechimer_thresholds, twarn, tcrit);

      /* initialize alarm signal handling */
      signal (SIGALRM, socket_timeout_alarm_handler);

      /* set socket timeout */
      alarm (socket_timeout);

      /* This returns either OK or WARNING (See comment preceeding ntp_request) */
      result = ntp_request(server_address, &offset, &offset_result, &jitter, &stratum, &num_truechimers);

      if(offset_result == STATE_UNKNOWN) {
            /* if there's no sync peer (this overrides ntp_request output): */
            result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
      } else {
            /* Be quiet if there's no candidates either */
            if (quiet == 1 && result == STATE_WARNING)
                  result = STATE_UNKNOWN;
            result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));

            result = max_state_alt(result, get_status(num_truechimers, truechimer_thresholds));

            result = max_state_alt(result, get_status(stratum, stratum_thresholds));

            result = max_state_alt(result, get_status(jitter, jitter_thresholds));

      switch (result) {
            case STATE_CRITICAL :
                  asprintf(&result_line, _("NTP CRITICAL:"));
            case STATE_WARNING :
                  asprintf(&result_line, _("NTP WARNING:"));
            case STATE_OK :
                  asprintf(&result_line, _("NTP OK:"));
            default :
                  asprintf(&result_line, _("NTP UNKNOWN:"));
            asprintf(&result_line, "%s %s,", result_line, _("Server not synchronized"));
      else if(li_alarm)
            asprintf(&result_line, "%s %s,", result_line, _("Server has the LI_ALARM bit set"));

      if(offset_result == STATE_UNKNOWN){
            asprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
            asprintf(&perfdata_line, "");
      } else {
            asprintf(&result_line, "%s %s %.10g secs", result_line, _("Offset"), offset);
            asprintf(&perfdata_line, "%s", perfd_offset(offset));
      if (do_jitter) {
            asprintf(&result_line, "%s, jitter=%f", result_line, jitter);
            asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
      if (do_stratum) {
            asprintf(&result_line, "%s, stratum=%i", result_line, stratum);
            asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
      if (do_truechimers) {
            asprintf(&result_line, "%s, truechimers=%i", result_line, num_truechimers);
            asprintf(&perfdata_line, "%s %s", perfdata_line, perfd_truechimers(num_truechimers));
      printf("%s|%s\n", result_line, perfdata_line);

      if(server_address!=NULL) free(server_address);
      return result;

void print_help(void){
      print_revision(progname, NP_VERSION);

      printf ("Copyright (c) 2006 Sean Finney\n");
      printf (COPYRIGHT, copyright, email);

      printf ("%s\n", _("This plugin checks the selected ntp server"));

      printf ("\n\n");

      printf (UT_HELP_VRSN);
      printf (UT_EXTRA_OPTS);
      printf (UT_HOST_PORT, 'p', "123");
      printf (" %s\n", "-q, --quiet");
      printf ("    %s\n", _("Returns UNKNOWN instead of CRITICAL or WARNING if server isn't synchronized"));
      printf (" %s\n", "-w, --warning=THRESHOLD");
      printf ("    %s\n", _("Offset to result in warning status (seconds)"));
      printf (" %s\n", "-c, --critical=THRESHOLD");
      printf ("    %s\n", _("Offset to result in critical status (seconds)"));
      printf (" %s\n", "-W, --swarn=THRESHOLD");
      printf ("    %s\n", _("Warning threshold for stratum"));
      printf (" %s\n", "-C, --scrit=THRESHOLD");
      printf ("    %s\n", _("Critical threshold for stratum"));
      printf (" %s\n", "-j, --jwarn=THRESHOLD");
      printf ("    %s\n", _("Warning threshold for jitter"));
      printf (" %s\n", "-k, --jcrit=THRESHOLD");
      printf ("    %s\n", _("Critical threshold for jitter"));
      printf (" %s\n", "-m, --twarn=THRESHOLD");
      printf ("    %s\n", _("Warning threshold for number of usable time sources (\"truechimers\")"));
      printf (" %s\n", "-n, --tcrit=THRESHOLD");
      printf ("    %s\n", _("Critical threshold for number of usable time sources (\"truechimers\")"));
      printf (UT_VERBOSE);

      printf("%s\n", _("This plugin checks an NTP server independent of any commandline"));
      printf("%s\n\n", _("programs or external libraries."));

      printf("%s\n", _("Notes:"));
      printf(" %s\n", _("Use this plugin to check the health of an NTP server. It supports"));
      printf(" %s\n", _("checking the offset with the sync peer, the jitter and stratum. This"));
      printf(" %s\n", _("plugin will not check the clock offset between the local host and NTP"));
      printf(" %s\n", _("server; please use check_ntp_time for that purpose."));

      printf("%s\n", _("Examples:"));
      printf(" %s\n", _("Simple NTP server check:"));
      printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1"));
      printf(" %s\n", _("Check jitter too, avoiding critical notifications if jitter isn't available"));
      printf(" %s\n", _("(See Notes above for more details on thresholds formats):"));
      printf("  %s\n", ("./check_ntp_peer -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
      printf(" %s\n", _("Only check the number of usable time sources (\"truechimers\"):"));
      printf("  %s\n", ("./check_ntp_peer -H ntpserv -m :5 -n :3"));
      printf(" %s\n", _("Check only stratum:"));
      printf("  %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));

      printf (UT_SUPPORT);

      printf ("%s\n", _("Usage:"));
      printf(" %s -H <host> [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
      printf("       [-j <warn>] [-k <crit>] [-v verbose]\n");

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