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* Nagios check_ntp plugin
* License: GPL
* Copyright (c) 2006 sean finney <seanius@seanius.net>
* Copyright (c) 2006 nagios-plugins team
* Last Modified: $Date: 2007/04/10 07:17:18 $
* Description:
* This file contains the check_ntp plugin
*  This plugin to check ntp servers independant of any commandline
*  programs or external libraries.
* License Information:
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 $Id: check_ntp.c,v 1.25 2007/04/10 07:17:18 dermoth Exp $

const char *progname = "check_ntp";
const char *revision = "$Revision: 1.25 $";
const char *copyright = "2006";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

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

static char *server_address=NULL;
static int verbose=0;
static double owarn=60;
static double ocrit=120;
static short do_jitter=0;
static double jwarn=5000;
static double jcrit=10000;

int process_arguments (int, char **);
void print_help (void);
void print_usage (void);

/* number of times to perform each request to get a good average. */
#define AVG_NUM 4

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

/* this structure holds everything in an ntp request/response as per rfc1305 */
typedef struct {
      uint8_t flags;       /* byte with leapindicator,vers,mode. see macros */
      uint8_t stratum;     /* clock stratum */
      int8_t poll;         /* polling interval */
      int8_t precision;    /* precision of the local clock */
      int32_t rtdelay;     /* total rt delay, as a fixed point num. see macros */
      uint32_t rtdisp;     /* like above, but for max err to primary src */
      uint32_t refid;      /* ref clock identifier */
      uint64_t refts;      /* reference timestamp.  local time local clock */
      uint64_t origts;     /* time at which request departed client */
      uint64_t rxts;       /* time at which request arrived at server */
      uint64_t txts;       /* time at which request departed server */
} ntp_message;

/* this structure holds data about results from querying offset from a peer */
typedef struct {
      time_t waiting;         /* ts set when we started waiting for a response */ 
      int num_responses;      /* number of successfully recieved responses */
      uint8_t stratum;        /* copied verbatim from the ntp_message */
      double rtdelay;         /* converted from the ntp_message */
      double rtdisp;          /* converted from the ntp_message */
      double offset[AVG_NUM]; /* offsets from each response */
} ntp_server_results;

/* 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_INCLUDED 0x04
#define PEER_SYNCSOURCE 0x06

 ** a note about the 32-bit "fixed point" numbers:
 they are divided into halves, each being a 16-bit int in network byte order:
 - the first 16 bits are an int on the left side of a decimal point.
 - the second 16 bits represent a fraction n/(2^16)
 likewise for the 64-bit "fixed point" numbers with everything doubled :) 

/* macros to access the left/right 16 bits of a 32-bit ntp "fixed point"
   number.  note that these can be used as lvalues too */
#define L16(x) (((uint16_t*)&x)[0])
#define R16(x) (((uint16_t*)&x)[1])
/* macros to access the left/right 32 bits of a 64-bit ntp "fixed point"
   number.  these too can be used as lvalues */
#define L32(x) (((uint32_t*)&x)[0])
#define R32(x) (((uint32_t*)&x)[1])

/* ntp wants seconds since 1/1/00, epoch is 1/1/70.  this is the difference */
#define EPOCHDIFF 0x83aa7e80UL

/* extract a 32-bit ntp fixed point number into a double */
#define NTP32asDOUBLE(x) (ntohs(L16(x)) + (double)ntohs(R16(x))/65536.0)

/* likewise for a 64-bit ntp fp number */
#define NTP64asDOUBLE(n) (double)(((uint64_t)n)?\
                         (ntohl(L32(n))-EPOCHDIFF) + \

/* convert a struct timeval to a double */
#define TVasDOUBLE(x) (double)(x.tv_sec+(0.000001*x.tv_usec))

/* convert an ntp 64-bit fp number to a struct timeval */
#define NTP64toTV(n,t) \
      do{ if(!n) t.tv_sec = t.tv_usec = 0; \
          else { \
                  t.tv_sec=ntohl(L32(n))-EPOCHDIFF; \
                  t.tv_usec=(int)(0.5+(double)(ntohl(R32(n))/4294.967296)); \
            } \

/* convert a struct timeval to an ntp 64-bit fp number */
#define TVtoNTP64(t,n) \
      do{ if(!t.tv_usec && !t.tv_sec) n=0x0UL; \
            else { \
                  L32(n)=htonl(t.tv_sec + EPOCHDIFF); \
                  R32(n)=htonl((uint64_t)((4294.967296*t.tv_usec)+.5)); \
            } \
      } while(0)

/* 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)+((m.count)?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);\

/* calculate the offset of the local clock */
static inline double calc_offset(const ntp_message *m, const struct timeval *t){
      double client_tx, peer_rx, peer_tx, client_rx;
      client_tx = NTP64asDOUBLE(m->origts);
      peer_rx = NTP64asDOUBLE(m->rxts);
      peer_tx = NTP64asDOUBLE(m->txts);
      return (.5*((peer_tx-client_rx)+(peer_rx-client_tx)));

/* print out a ntp packet in human readable/debuggable format */
void print_ntp_message(const ntp_message *p){
      struct timeval ref, orig, rx, tx;


      printf("packet contents:\n");
      printf("\tflags: 0x%.2x\n", p->flags);
      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("\tstratum = %d\n", p->stratum);
      printf("\tpoll = %g\n", pow(2, p->poll));
      printf("\tprecision = %g\n", pow(2, p->precision));
      printf("\trtdelay = %-.16g\n", NTP32asDOUBLE(p->rtdelay));
      printf("\trtdisp = %-.16g\n", NTP32asDOUBLE(p->rtdisp));
      printf("\trefid = %x\n", p->refid);
      printf("\trefts = %-.16g\n", NTP64asDOUBLE(p->refts));
      printf("\torigts = %-.16g\n", NTP64asDOUBLE(p->origts));
      printf("\trxts = %-.16g\n", NTP64asDOUBLE(p->rxts));
      printf("\ttxts = %-.16g\n", NTP64asDOUBLE(p->txts));

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_INCLUDED){
                        if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
                              printf(" <-- current sync source");
                        } else {
                              printf(" <-- current sync candidate");

void setup_request(ntp_message *p){
      struct timeval t;

      memset(p, 0, sizeof(ntp_message));
      LI_SET(p->flags, LI_ALARM);
      VN_SET(p->flags, 4);
      MODE_SET(p->flags, MODE_CLIENT);

      gettimeofday(&t, NULL);

/* select the "best" server from a list of servers, and return its index.
 * this is done by filtering servers based on stratum, dispersion, and
 * finally round-trip delay. */
int best_offset_server(const ntp_server_results *slist, int nservers){
      int i=0, j=0, cserver=0, candidates[5], csize=0;

      /* for each server */
      for(cserver=0; cserver<nservers; cserver++){
            /* compare it to each of the servers already in the candidate list */
            for(i=0; i<csize; i++){
                  /* does it have an equal or better stratum? */
                  if(slist[cserver].stratum <= slist[i].stratum){
                        /* does it have an equal or better dispersion? */
                        if(slist[cserver].rtdisp <= slist[i].rtdisp){
                              /* does it have a better rtdelay? */
                              if(slist[cserver].rtdelay < slist[i].rtdelay){

            /* if we haven't reached the current list's end, move everyone
             * over one to the right, and insert the new candidate */
                  for(j=5; j>i; j--){
            /* regardless, if they should be on the list... */
            if(i<5) {
                  if(csize<5) csize++;
            /* otherwise discard the server */
            } else {
                  DBG(printf("discarding peer id %d\n", cserver));

      if(csize>0) {
            DBG(printf("best server selected: peer %d\n", candidates[0]));
            return candidates[0];
      } else {
            DBG(printf("no peers meeting synchronization criteria :(\n"));
            return -1;

/* do everything we need to get the total average offset
 * - we use a certain amount of parallelization with poll() to ensure
 *   we don't waste time sitting around waiting for single packets. 
 * - we also "manually" handle resolving host names and connecting, because
 *   we have to do it in a way that our lazy macros don't handle currently :( */
double offset_request(const char *host, int *status){
      int i=0, j=0, ga_result=0, num_hosts=0, *socklist=NULL, respnum=0;
      int servers_completed=0, one_written=0, one_read=0, servers_readable=0, best_index=-1;
      time_t now_time=0, start_ts=0;
      ntp_message *req=NULL;
      double avg_offset=0.;
      struct timeval recv_time;
      struct addrinfo *ai=NULL, *ai_tmp=NULL, hints;
      struct pollfd *ufds=NULL;
      ntp_server_results *servers=NULL;

      /* setup hints to only return results from getaddrinfo that we'd like */
      memset(&hints, 0, sizeof(struct addrinfo));
      hints.ai_family = address_family;
      hints.ai_protocol = IPPROTO_UDP;
      hints.ai_socktype = SOCK_DGRAM;

      /* fill in ai with the list of hosts resolved by the host name */
      ga_result = getaddrinfo(host, "123", &hints, &ai);
            die(STATE_UNKNOWN, "error getting address for %s: %s\n",
                host, gai_strerror(ga_result));

      /* count the number of returned hosts, and allocate stuff accordingly */
      for(ai_tmp=ai; ai_tmp!=NULL; ai_tmp=ai_tmp->ai_next){ num_hosts++; }
      if(req==NULL) die(STATE_UNKNOWN, "can not allocate ntp message array");
      if(socklist==NULL) die(STATE_UNKNOWN, "can not allocate socket array");
      ufds=(struct pollfd*)malloc(sizeof(struct pollfd)*num_hosts);
      if(ufds==NULL) die(STATE_UNKNOWN, "can not allocate socket array");
      if(servers==NULL) die(STATE_UNKNOWN, "can not allocate server array");
      memset(servers, 0, sizeof(ntp_server_results)*num_hosts);

      /* setup each socket for writing, and the corresponding struct pollfd */
            socklist[i]=socket(ai_tmp->ai_family, SOCK_DGRAM, IPPROTO_UDP);
            if(socklist[i] == -1) {
                  die(STATE_UNKNOWN, "can not create new socket");
            if(connect(socklist[i], ai_tmp->ai_addr, ai_tmp->ai_addrlen)){
                  die(STATE_UNKNOWN, "can't create socket connection");
            } else {
            ai_tmp = ai_tmp->ai_next;

      /* now do AVG_NUM checks to each host.  we stop before timeout/2 seconds
       * have passed in order to ensure post-processing and jitter time. */
      while(servers_completed<num_hosts && now_time-start_ts <= socket_timeout/2){
            /* loop through each server and find each one which hasn't
             * been touched in the past second or so and is still lacking
             * some responses.  for each of these servers, send a new request,
             * and update the "waiting" timestamp with the current time. */

            for(i=0; i<num_hosts; i++){
                  if(servers[i].waiting<now_time && servers[i].num_responses<AVG_NUM){
                        if(verbose && servers[i].waiting != 0) printf("re-");
                        if(verbose) printf("sending request to peer %d\n", i);
                        write(socklist[i], &req[i], sizeof(ntp_message));

            /* quickly poll for any sockets with pending data */
            servers_readable=poll(ufds, num_hosts, 100);
                  perror("polling ntp sockets");
                  die(STATE_UNKNOWN, "communication errors");

            /* read from any sockets with pending data */
            for(i=0; servers_readable && i<num_hosts; i++){
                  if(ufds[i].revents&POLLIN && servers[i].num_responses < AVG_NUM){
                        if(verbose) {
                              printf("response from peer %d: ", i);

                        read(ufds[i].fd, &req[i], sizeof(ntp_message));
                        gettimeofday(&recv_time, NULL);
                        servers[i].offset[respnum]=calc_offset(&req[i], &recv_time);
                        if(verbose) {
                              printf("offset %.10g\n", servers[i].offset[respnum]);
                        one_read = 1;
                        if(servers[i].num_responses==AVG_NUM) servers_completed++;
            /* lather, rinse, repeat. */

      if (one_read == 0) {
            die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");

      /* now, pick the best server from the list */
      best_index=best_offset_server(servers, num_hosts);
      if(best_index < 0){
      } else {
            /* finally, calculate the average offset */
            for(i=0; i<servers[best_index].num_responses;i++){

      /* cleanup */
      /* FIXME: Not closing the socket to avoid re-use of the local port
       * which can cause old NTP packets to be read instead of NTP control
       * pactets in jitter_request(). THERE MUST BE ANOTHER WAY...
       * for(j=0; j<num_hosts; j++){ close(socklist[j]); } */

      if(verbose) printf("overall average offset: %.10g\n", avg_offset);
      return avg_offset;

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 */

/* XXX handle responses with the error bit set */
double jitter_request(const char *host, int *status){
      int conn=-1, i, npeers=0, num_candidates=0, syncsource_found=0;
      int run=0, min_peer_sel=PEER_INCLUDED, num_selected=0, num_valid=0;
      int peers_size=0, peer_offset=0;
      ntp_assoc_status_pair *peers=NULL;
      ntp_control_message req;
      const char *getvar = "jitter";
      double rval = 0.0, jitter = -1.0;
      char *startofvalue=NULL, *nptr=NULL;
      void *tmp;

      /* Long-winded explanation:
       * Getting the jitter 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 jitter value from the data[] (it's ASCII)
      my_udp_connect(server_address, 123, &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"))
            read(conn, &req, SIZEOF_NTPCM(req));
            /* 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 case of the latter 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_INCLUDED){
                  if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
      if(verbose) printf("%d candiate 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");

      for (run=0; run<AVG_NUM; run++){
            if(verbose) printf("jitter run %d of %d\n", run+1, AVG_NUM);
            for (i = 0; i < npeers; i++){
                  /* Only query this server if it is the current sync source */
                  if (PEER_SEL(peers[i].status) >= min_peer_sel){
                        setup_control_request(&req, OP_READVAR, 2);
                        req.assoc = peers[i].assoc;
                        /* By spec, putting the variable name "jitter"  in the request
                         * should cause the server to provide _only_ the jitter value.
                         * 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("recieving READVAR response...\n"));
                        read(conn, &req, SIZEOF_NTPCM(req));

                        if(req.op&REM_ERROR && strstr(getvar, "jitter")) {
                              if(verbose) printf("The 'jitter' command failed (old ntp server?)\nRestarting with 'dispersion'...\n");
                              getvar = "dispersion";

                        /* get to the float value */
                        if(verbose) {
                              printf("parsing jitter from peer %.2x: ", ntohs(peers[i].assoc));
                        startofvalue = strchr(req.data, '=');
                        if(startofvalue != NULL) {
                              jitter = strtod(startofvalue, &nptr);
                        if(startofvalue == NULL || startofvalue==nptr){
                              printf("warning: unable to read server jitter response.\n");
                              *status = STATE_WARNING;
                        } else {
                              if(verbose) printf("%g\n", jitter);
                              rval += jitter;
                  printf("jitter parsed from %d/%d peers\n", num_valid, num_selected);

      rval = num_valid ? rval / num_valid : -1.0;

      if(peers!=NULL) free(peers);
      /* If we return -1.0, it means no synchronization source was found */
      return rval;

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'},
            {"warning", required_argument, 0, 'w'},
            {"critical", required_argument, 0, 'c'},
            {"jwarn", required_argument, 0, 'j'},
            {"jcrit", required_argument, 0, 'k'},
            {"timeout", required_argument, 0, 't'},
            {"hostname", required_argument, 0, 'H'},
            {0, 0, 0, 0}

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

      while (1) {
            c = getopt_long (argc, argv, "Vhv46w:c:j:k:t:H:", longopts, &option);
            if (c == -1 || c == EOF || c == 1)

            switch (c) {
            case 'h':
            case 'V':
                  print_revision(progname, revision);
            case 'v':
            case 'w':
                  owarn = atof(optarg);
            case 'c':
                  ocrit = atof(optarg);
            case 'j':
                  jwarn = atof(optarg);
            case 'k':
                  jcrit = atof(optarg);
            case 'H':
                  if(is_host(optarg) == FALSE)
                        usage2(_("Invalid hostname/address"), optarg);
                  server_address = strdup(optarg);
            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 (ocrit < owarn){
            usage4(_("Critical offset should be larger than warning offset"));

      if (ocrit < owarn){
            usage4(_("Critical jitter should be larger than warning jitter"));

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

      return 0;

char *perfd_offset (double offset)
      return fperfdata ("offset", offset, "s",
            TRUE, owarn,
            TRUE, ocrit,
            FALSE, 0, FALSE, 0);

char *perfd_jitter (double jitter)
      return fperfdata ("jitter", jitter, "s",
            do_jitter, jwarn,
            do_jitter, jcrit,
            TRUE, 0, FALSE, 0);

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


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

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

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

      offset = offset_request(server_address, &offset_result);
      if(fabs(offset) > ocrit){
            result = STATE_CRITICAL;
      } else if(fabs(offset) > owarn) {
            result = STATE_WARNING;
      } else {
            result = STATE_OK;
      result=max_state(result, offset_result);

      /* If not told to check the jitter, we don't even send packets.
       * jitter is checked using NTP control packets, which not all
       * servers recognize.  Trying to check the jitter on OpenNTPD
       * (for example) will result in an error
            jitter=jitter_request(server_address, &jitter_result);
            if(jitter > jcrit){
                  result = max_state(result, STATE_CRITICAL);
            } else if(jitter > jwarn) {
                  result = max_state(result, STATE_WARNING);
            } else if(jitter == -1.0 && result == STATE_OK){
                  /* -1 indicates that we couldn't calculate the jitter
                   * Only overrides STATE_OK from the offset */
                  result = STATE_UNKNOWN;
      result=max_state(result, jitter_result);

      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, _("Offset unknown"));
      } else {
                  asprintf(&result_line, "%s %s", result_line, _("Unable to fully sample sync server"));
            asprintf(&result_line, "%s Offset %.10g secs", result_line, 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));
      printf("%s|%s\n", result_line, perfdata_line);

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

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

      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_HOST_PORT), 'p', "123");
      printf (" %s\n", "-w, --warning=DOUBLE");
      printf ("    %s\n", _("Offset to result in warning status (seconds)"));
      printf (" %s\n", "-c, --critical=DOUBLE");
      printf ("    %s\n", _("Offset to result in critical status (seconds)"));
      printf (" %s\n", "-j, --warning=DOUBLE");
      printf ("    %s\n", _("Warning value for jitter"));
      printf (" %s\n", "-k, --critical=DOUBLE");
      printf ("    %s\n", _("Critical value for jitter"));
      printf (_(UT_VERBOSE));
      printf (_(UT_SUPPORT));

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

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