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pkg-monitoring-plugins/plugins/check_ntp_peer.c

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/*****************************************************************************
*
* Monitoring check_ntp_peer plugin
*
* License: GPL
* Copyright (c) 2006 Sean Finney <seanius@seanius.net>
* Copyright (c) 2006-2008 Monitoring 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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 = "devel@monitoring-plugins.org";
#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);\
}while(0);
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));
numpeers=ntohs(p->count)/(sizeof(ntp_assoc_status_pair));
if(p->op&REM_RESP && p->op&OP_READSTAT){
peer=(ntp_assoc_status_pair*)p->data;
for(i=0;i<numpeers;i++){
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");
}
printf("\n");
}
}
}
void
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. */
do{
setup_control_request(&req, OP_READSTAT, 1);
DBG(printf("sending READSTAT request"));
write(conn, &req, SIZEOF_NTPCM(req));
DBG(print_ntp_control_message(&req));
do {
/* Attempt to read the largest size packet possible */
req.count=htons(MAX_CM_SIZE);
DBG(printf("recieving READSTAT response"))
if(read(conn, &req, SIZEOF_NTPCM(req)) == -1)
die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
DBG(print_ntp_control_message(&req));
/* discard obviously invalid packets */
if (ntohs(req.count) > MAX_CM_SIZE)
die(STATE_CRITICAL, "NTP CRITICAL: Invalid packet received from NTP server\n");
} while (!(req.op&OP_READSTAT && ntohs(req.seq) == 1));
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.
*/
peers_size+=ntohs(req.count);
if((tmp=realloc(peers, peers_size)) == NULL)
free(peers), die(STATE_UNKNOWN, "can not (re)allocate 'peers' buffer\n");
peers=tmp;
memcpy((void*)((ptrdiff_t)peers+peer_offset), (void*)req.data, ntohs(req.count));
npeers=peers_size/sizeof(ntp_assoc_status_pair);
peer_offset+=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){
(*num_truechimers)++;
if(PEER_SEL(peers[i].status) >= PEER_INCLUDED){
num_candidates++;
if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
syncsource_found=1;
min_peer_sel=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");
}
if(li_alarm){
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));
xasprintf(&data, "");
do{
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));
DBG(print_ntp_control_message(&req));
do {
req.count = htons(MAX_CM_SIZE);
DBG(printf("receiving READVAR response...\n"));
read(conn, &req, SIZEOF_NTPCM(req));
DBG(print_ntp_control_message(&req));
} while (!(req.op&OP_READVAR && ntohs(req.seq) == 2));
if(!(req.op&REM_ERROR))
xasprintf(&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";
i--;
continue;
} else if(strlen(getvar)) {
if(verbose) printf("Server didn't like dispersion either; will retrieve everything\n");
getvar = "";
i--;
continue;
}
}
if(verbose > 1)
printf("Server responded: >>>%s<<<\n", data);
/* get the offset */
if(verbose)
printf("parsing offset from peer %.2x: ", ntohs(peers[i].assoc));
value = np_extract_ntpvar(data, "offset");
nptr=NULL;
/* 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 */
continue;
}
}
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");
nptr=NULL;
/* 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");
nptr=NULL;
/* 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++) */
close(conn);
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)
break;
switch (c) {
case 'h':
print_help();
exit(STATE_OK);
break;
case 'V':
print_revision(progname, NP_VERSION);
exit(STATE_OK);
break;
case 'v':
verbose++;
break;
case 'q':
quiet = 1;
break;
case 'w':
do_offset=1;
owarn = optarg;
break;
case 'c':
do_offset=1;
ocrit = optarg;
break;
case 'W':
do_stratum=1;
swarn = optarg;
break;
case 'C':
do_stratum=1;
scrit = optarg;
break;
case 'j':
do_jitter=1;
jwarn = optarg;
break;
case 'k':
do_jitter=1;
jcrit = optarg;
break;
case 'm':
do_truechimers=1;
twarn = optarg;
break;
case 'n':
do_truechimers=1;
tcrit = optarg;
break;
case 'H':
if(is_host(optarg) == FALSE)
usage2(_("Invalid hostname/address"), optarg);
server_address = strdup(optarg);
break;
case 'p':
port=atoi(optarg);
break;
case 't':
socket_timeout=atoi(optarg);
break;
case '4':
address_family = AF_INET;
break;
case '6':
#ifdef USE_IPV6
address_family = AF_INET6;
#else
usage4 (_("IPv6 support not available"));
#endif
break;
case '?':
/* print short usage statement if args not parsable */
usage5 ();
break;
}
}
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));
}
if(do_truechimers)
result = max_state_alt(result, get_status(num_truechimers, truechimer_thresholds));
if(do_stratum)
result = max_state_alt(result, get_status(stratum, stratum_thresholds));
if(do_jitter)
result = max_state_alt(result, get_status(jitter, jitter_thresholds));
switch (result) {
case STATE_CRITICAL :
xasprintf(&result_line, _("NTP CRITICAL:"));
break;
case STATE_WARNING :
xasprintf(&result_line, _("NTP WARNING:"));
break;
case STATE_OK :
xasprintf(&result_line, _("NTP OK:"));
break;
default :
xasprintf(&result_line, _("NTP UNKNOWN:"));
break;
}
if(!syncsource_found)
xasprintf(&result_line, "%s %s,", result_line, _("Server not synchronized"));
else if(li_alarm)
xasprintf(&result_line, "%s %s,", result_line, _("Server has the LI_ALARM bit set"));
if(offset_result == STATE_UNKNOWN){
xasprintf(&result_line, "%s %s", result_line, _("Offset unknown"));
xasprintf(&perfdata_line, "");
} else {
xasprintf(&result_line, "%s %s %.10g secs", result_line, _("Offset"), offset);
xasprintf(&perfdata_line, "%s", perfd_offset(offset));
}
if (do_jitter) {
xasprintf(&result_line, "%s, jitter=%f", result_line, jitter);
xasprintf(&perfdata_line, "%s %s", perfdata_line, perfd_jitter(jitter));
}
if (do_stratum) {
xasprintf(&result_line, "%s, stratum=%i", result_line, stratum);
xasprintf(&perfdata_line, "%s %s", perfdata_line, perfd_stratum(stratum));
}
if (do_truechimers) {
xasprintf(&result_line, "%s, truechimers=%i", result_line, num_truechimers);
xasprintf(&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");
print_usage();
printf (UT_HELP_VRSN);
printf (UT_EXTRA_OPTS);
printf (UT_IPv46);
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 of server's synchronization peer"));
printf (" %s\n", "-C, --scrit=THRESHOLD");
printf (" %s\n", _("Critical threshold for stratum of server's synchronization peer"));
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_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
printf (UT_VERBOSE);
printf("\n");
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("\n");
printf(UT_THRESHOLDS_NOTES);
printf("\n");
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("\n");
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("\n");
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("\n");
printf(" %s\n", _("Check only stratum:"));
printf(" %s\n", ("./check_ntp_peer -H ntpserv -W 4 -C 6"));
printf (UT_SUPPORT);
}
void
print_usage(void)
{
printf ("%s\n", _("Usage:"));
printf(" %s -H <host> [-4|-6] [-w <warn>] [-c <crit>] [-W <warn>] [-C <crit>]\n", progname);
printf(" [-j <warn>] [-k <crit>] [-v verbose]\n");
}
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