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monitoring-plugins/plugins/check_ntp.c
Thomas Guyot-Sionnest 25d1ee331d Fix translations when extra-opts aren't enabled 
Bug #2832884 reported problem with translations outputting pot file
headers. This is caused by "" matching the header of the translation
files.

This patch moves gettext macros inside utils macros and update some
french translations.
2010-04-14 08:33:06 -04:00

889 lines
30 KiB
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/*****************************************************************************
*
* Nagios check_ntp 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 plugin
*
* This plugin to check ntp servers independant of any commandline
* programs or external libraries.
*
*
* 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";
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 verbose=0;
static short do_offset=0;
static char *owarn="60";
static char *ocrit="120";
static short do_jitter=0;
static char *jwarn="5000";
static char *jcrit="10000";
int process_arguments (int, char **);
thresholds *offset_thresholds = NULL;
thresholds *jitter_thresholds = NULL;
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 */
uint8_t flags; /* byte with leapindicator,vers,mode. see macros */
} 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) + \
(.00000001*(0.5+(double)(ntohl(R32(n))/42.94967296))):\
0)
/* 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)); \
} \
}while(0)
/* 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)+((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);
/* 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);
client_rx=TVasDOUBLE((*t));
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;
NTP64toTV(p->refts,ref);
NTP64toTV(p->origts,orig);
NTP64toTV(p->rxts,rx);
NTP64toTV(p->txts,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));
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_INCLUDED){
if(PEER_SEL(peer[i].status) >= PEER_SYNCSOURCE){
printf(" <-- current sync source");
} else {
printf(" <-- current sync candidate");
}
}
printf("\n");
}
}
}
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);
p->poll=4;
p->precision=(int8_t)0xfa;
L16(p->rtdelay)=htons(1);
L16(p->rtdisp)=htons(1);
gettimeofday(&t, NULL);
TVtoNTP64(t,p->txts);
}
/* 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, cserver=0, best_server=-1;
/* for each server */
for(cserver=0; cserver<nservers; cserver++){
/* We don't want any servers that fails these tests */
/* Sort out servers that didn't respond or responede with a 0 stratum;
* stratum 0 is for reference clocks so no NTP server should ever report
* a stratum 0 */
if ( slist[cserver].stratum == 0){
if (verbose) printf("discarding peer %d: stratum=%d\n", cserver, slist[cserver].stratum);
continue;
}
/* Sort out servers with error flags */
if ( LI(slist[cserver].flags) == LI_ALARM ){
if (verbose) printf("discarding peer %d: flags=%d\n", cserver, LI(slist[cserver].flags));
continue;
}
/* If we don't have a server yet, use the first one */
if (best_server == -1) {
best_server = cserver;
DBG(printf("using peer %d as our first candidate\n", best_server));
continue;
}
/* compare the server to the best one we've seen so far */
/* does it have an equal or better stratum? */
DBG(printf("comparing peer %d with peer %d\n", cserver, best_server));
if(slist[cserver].stratum <= slist[best_server].stratum){
DBG(printf("stratum for peer %d <= peer %d\n", cserver, best_server));
/* does it have an equal or better dispersion? */
if(slist[cserver].rtdisp <= slist[best_server].rtdisp){
DBG(printf("dispersion for peer %d <= peer %d\n", cserver, best_server));
/* does it have a better rtdelay? */
if(slist[cserver].rtdelay < slist[best_server].rtdelay){
DBG(printf("rtdelay for peer %d < peer %d\n", cserver, best_server));
best_server = cserver;
DBG(printf("peer %d is now our best candidate\n", best_server));
}
}
}
}
if(best_server >= 0) {
DBG(printf("best server selected: peer %d\n", best_server));
return best_server;
} 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);
if(ga_result!=0){
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++; }
req=(ntp_message*)malloc(sizeof(ntp_message)*num_hosts);
if(req==NULL) die(STATE_UNKNOWN, "can not allocate ntp message array");
socklist=(int*)malloc(sizeof(int)*num_hosts);
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");
servers=(ntp_server_results*)malloc(sizeof(ntp_server_results)*num_hosts);
if(servers==NULL) die(STATE_UNKNOWN, "can not allocate server array");
memset(servers, 0, sizeof(ntp_server_results)*num_hosts);
DBG(printf("Found %d peers to check\n", num_hosts));
/* setup each socket for writing, and the corresponding struct pollfd */
ai_tmp=ai;
for(i=0;ai_tmp;i++){
socklist[i]=socket(ai_tmp->ai_family, SOCK_DGRAM, IPPROTO_UDP);
if(socklist[i] == -1) {
perror(NULL);
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 {
ufds[i].fd=socklist[i];
ufds[i].events=POLLIN;
ufds[i].revents=0;
}
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. */
now_time=start_ts=time(NULL);
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. */
one_written=0;
now_time=time(NULL);
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);
setup_request(&req[i]);
write(socklist[i], &req[i], sizeof(ntp_message));
servers[i].waiting=now_time;
one_written=1;
break;
}
}
/* quickly poll for any sockets with pending data */
servers_readable=poll(ufds, num_hosts, 100);
if(servers_readable==-1){
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);
DBG(print_ntp_message(&req[i]));
respnum=servers[i].num_responses++;
servers[i].offset[respnum]=calc_offset(&req[i], &recv_time);
if(verbose) {
printf("offset %.10g\n", servers[i].offset[respnum]);
}
servers[i].stratum=req[i].stratum;
servers[i].rtdisp=NTP32asDOUBLE(req[i].rtdisp);
servers[i].rtdelay=NTP32asDOUBLE(req[i].rtdelay);
servers[i].waiting=0;
servers[i].flags=req[i].flags;
servers_readable--;
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){
*status=STATE_UNKNOWN;
} else {
/* finally, calculate the average offset */
for(i=0; i<servers[best_index].num_responses;i++){
avg_offset+=servers[best_index].offset[j];
}
avg_offset/=servers[best_index].num_responses;
}
/* 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]); } */
free(socklist);
free(ufds);
free(servers);
free(req);
freeaddrinfo(ai);
if(verbose) printf("overall average offset: %.10g\n", avg_offset);
return avg_offset;
}
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 */
}
/* 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. */
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));
/* Attempt to read the largest size packet possible */
req.count=htons(MAX_CM_SIZE);
DBG(printf("recieving READSTAT response"))
read(conn, &req, SIZEOF_NTPCM(req));
DBG(print_ntp_control_message(&req));
/* 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 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){
num_candidates++;
if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
syncsource_found=1;
min_peer_sel=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_UNKNOWN;
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){
num_selected++;
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));
DBG(print_ntp_control_message(&req));
req.count = htons(MAX_CM_SIZE);
DBG(printf("recieving READVAR response...\n"));
read(conn, &req, SIZEOF_NTPCM(req));
DBG(print_ntp_control_message(&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";
num_selected--;
i--;
continue;
}
/* get to the float value */
if(verbose) {
printf("parsing jitter from peer %.2x: ", ntohs(peers[i].assoc));
}
startofvalue = strchr(req.data, '=');
if(startofvalue != NULL) {
startofvalue++;
jitter = strtod(startofvalue, &nptr);
}
if(startofvalue == NULL || startofvalue==nptr){
printf("warning: unable to read server jitter response.\n");
*status = STATE_UNKNOWN;
} else {
if(verbose) printf("%g\n", jitter);
num_valid++;
rval += jitter;
}
}
}
if(verbose){
printf("jitter parsed from %d/%d peers\n", num_valid, num_selected);
}
}
rval = num_valid ? rval / num_valid : -1.0;
close(conn);
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)
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 'w':
do_offset=1;
owarn = optarg;
break;
case 'c':
do_offset=1;
ocrit = optarg;
break;
case 'j':
do_jitter=1;
jwarn = optarg;
break;
case 'k':
do_jitter=1;
jcrit = optarg;
break;
case 'H':
if(is_host(optarg) == FALSE)
usage2(_("Invalid hostname/address"), optarg);
server_address = strdup(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, "s",
do_jitter, jitter_thresholds->warning->end,
do_jitter, jitter_thresholds->critical->end,
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;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
result = offset_result = jitter_result = STATE_OK;
/* 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);
/* initialize alarm signal handling */
signal (SIGALRM, socket_timeout_alarm_handler);
/* set socket timeout */
alarm (socket_timeout);
offset = offset_request(server_address, &offset_result);
/* check_ntp used to always return CRITICAL if offset_result == STATE_UNKNOWN.
* Now we'll only do that is the offset thresholds were set */
if (do_offset && offset_result == STATE_UNKNOWN) {
result = STATE_CRITICAL;
} else {
result = get_status(fabs(offset), offset_thresholds);
}
/* 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
*/
if(do_jitter){
jitter=jitter_request(server_address, &jitter_result);
result = max_state_alt(result, get_status(jitter, jitter_thresholds));
/* -1 indicates that we couldn't calculate the jitter
* Only overrides STATE_OK from the offset */
if(jitter == -1.0 && result == STATE_OK)
result = STATE_UNKNOWN;
}
result = max_state_alt(result, jitter_result);
switch (result) {
case STATE_CRITICAL :
asprintf(&result_line, _("NTP CRITICAL:"));
break;
case STATE_WARNING :
asprintf(&result_line, _("NTP WARNING:"));
break;
case STATE_OK :
asprintf(&result_line, _("NTP OK:"));
break;
default :
asprintf(&result_line, _("NTP UNKNOWN:"));
break;
}
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));
}
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_HOST_PORT, 'p', "123");
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", "-j, --jwarn=THRESHOLD");
printf (" %s\n", _("Warning threshold for jitter"));
printf (" %s\n", "-k, --jcrit=THRESHOLD");
printf (" %s\n", _("Critical threshold for jitter"));
printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
printf (UT_VERBOSE);
printf("\n");
printf("%s\n", _("Notes:"));
printf(UT_THRESHOLDS_NOTES);
#ifdef NP_EXTRA_OPTS
printf("\n");
printf(UT_EXTRA_OPTS_NOTES);
#endif
printf("\n");
printf("%s\n", _("Examples:"));
printf(" %s\n", _("Normal offset check:"));
printf(" %s\n", ("./check_ntp -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 -H ntpserv -w 0.5 -c 1 -j -1:100 -k -1:200"));
printf (UT_SUPPORT);
printf ("%s\n", _("WARNING: check_ntp is deprecated. Please use check_ntp_peer or"));
printf ("%s\n\n", _("check_ntp_time instead."));
}
void
print_usage(void)
{
printf ("%s\n", _("WARNING: check_ntp is deprecated. Please use check_ntp_peer or"));
printf ("%s\n\n", _("check_ntp_time instead."));
printf (_("Usage:"));
printf(" %s -H <host> [-w <warn>] [-c <crit>] [-j <warn>] [-k <crit>] [-v verbose]\n", progname);
}
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