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https://github.com/monitoring-plugins/monitoring-plugins.git
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initial version of the pure-c check_ntp implementation. jitter not yet
implemented, and a couple other misc things to do, so i haven't yet patched Makefile.am git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1330 f882894a-f735-0410-b71e-b25c423dba1c
This commit is contained in:
M. Sean Finney
parent
cd8b45f633
commit
d4ddb48932
1 changed files with 355 additions and 0 deletions
355
plugins/check_ntp.c
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355
plugins/check_ntp.c
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/******************************************************************************
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check_ntp.c: utility to check ntp servers independant of any commandline
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programs or external libraries.
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original author: sean finney <seanius@seanius.net>
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******************************************************************************
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*****************************************************************************/
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const char *progname = "check_ntp";
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const char *revision = "$Revision$";
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const char *copyright = "2006";
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const char *email = "nagiosplug-devel@lists.sourceforge.net";
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#include "common.h"
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#include "netutils.h"
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#include "utils.h"
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static char *server_address=NULL;
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static int verbose=0;
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static int zero_offset_bad=0;
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static double owarn=0;
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static double ocrit=0;
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static short do_jitter=0;
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static double jwarn=0;
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static double jcrit=0;
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int process_arguments (int, char **);
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void print_help (void);
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void print_usage (void);
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/* this structure holds everything in an ntp request/response as per rfc1305 */
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typedef struct {
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uint8_t flags; /* byte with leapindicator,vers,mode. see macros */
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uint8_t stratum; /* clock stratum */
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int8_t poll; /* polling interval */
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int8_t precision; /* precision of the local clock */
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int32_t rtdelay; /* total rt delay, as a fixed point num. see macros */
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uint32_t rtdisp; /* like above, but for max err to primary src */
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uint32_t refid; /* ref clock identifier */
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uint64_t refts; /* reference timestamp. local time local clock */
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uint64_t origts; /* time at which request departed client */
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uint64_t rxts; /* time at which request arrived at server */
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uint64_t txts; /* time at which request departed server */
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} ntp_message;
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/* bits 1,2 are the leap indicator */
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#define LI_MASK 0xc0
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#define LI(x) ((x&LI_MASK)>>6)
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#define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
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/* and these are the values of the leap indicator */
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#define LI_NOWARNING 0x00
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#define LI_EXTRASEC 0x01
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#define LI_MISSINGSEC 0x02
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#define LI_ALARM 0x03
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/* bits 3,4,5 are the ntp version */
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#define VN_MASK 0x38
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#define VN(x) ((x&VN_MASK)>>3)
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#define VN_SET(x,y) do{ x |= ((y<<3)&VN_MASK); }while(0)
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/* bits 6,7,8 are the ntp mode */
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#define MODE_MASK 0x07
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#define MODE(x) (x&MODE_MASK)
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#define MODE_SET(x,y) do{ x |= (y&MODE_MASK); }while(0)
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/* here are some values */
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#define MODE_CLIENT 0x03
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/**
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** a note about the 32-bit "fixed point" numbers:
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**
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they are divided into halves, each being a 16-bit int in network byte order:
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- the first 16 bits are an int on the left side of a decimal point.
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- the second 16 bits represent a fraction n/(2^16)
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likewise for the 64-bit "fixed point" numbers with everything doubled :)
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**/
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/* macros to access the left/right 16 bits of a 32-bit ntp "fixed point"
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number. note that these can be used as lvalues too */
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#define L16(x) (((uint16_t*)&x)[0])
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#define R16(x) (((uint16_t*)&x)[1])
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/* macros to access the left/right 32 bits of a 64-bit ntp "fixed point"
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number. these too can be used as lvalues */
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#define L32(x) (((uint32_t*)&x)[0])
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#define R32(x) (((uint32_t*)&x)[1])
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/* ntp wants seconds since 1/1/00, epoch is 1/1/70. this is the difference */
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#define EPOCHDIFF 0x83aa7e80UL
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/* extract a 32-bit ntp fixed point number into a double */
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#define NTP32asDOUBLE(x) (ntohs(L16(x)) + (double)ntohs(R16(x))/65536.0)
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/* likewise for a 64-bit ntp fp number */
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#define NTP64asDOUBLE(n) (double)(((uint64_t)n)?\
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(ntohl(L32(n))-EPOCHDIFF) + \
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(.00000001*(0.5+(double)(ntohl(R32(n))/42.94967296))):\
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0)
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/* convert a struct timeval to a double */
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#define TVasDOUBLE(x) (double)(x.tv_sec+(0.000001*x.tv_usec))
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/* convert an ntp 64-bit fp number to a struct timeval */
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#define NTP64toTV(n,t) \
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do{ if(!n) t.tv_sec = t.tv_usec = 0; \
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else { \
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t.tv_sec=ntohl(L32(n))-EPOCHDIFF; \
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t.tv_usec=(int)(0.5+(double)(ntohl(R32(n))/4294.967296)); \
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} \
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}while(0)
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/* convert a struct timeval to an ntp 64-bit fp number */
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#define TVtoNTP64(t,n) \
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do{ if(!t.tv_usec && !t.tv_sec) n=0x0UL; \
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else { \
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L32(n)=htonl(t.tv_sec + EPOCHDIFF); \
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R32(n)=htonl((4294.967296*t.tv_usec)+.5); \
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} \
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} while(0)
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/* calculate the offset of the local clock */
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static inline double calc_offset(const ntp_message *m, const struct timeval *t){
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double client_tx, peer_rx, peer_tx, client_rx, rtdelay;
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client_tx = NTP64asDOUBLE(m->origts);
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peer_rx = NTP64asDOUBLE(m->rxts);
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peer_tx = NTP64asDOUBLE(m->txts);
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client_rx=TVasDOUBLE((*t));
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rtdelay=NTP32asDOUBLE(m->rtdelay);
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return (.5*((peer_tx-client_rx)+(peer_rx-client_tx)))-rtdelay;
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}
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/* print out a ntp packet in human readable/debuggable format */
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void print_packet(const ntp_message *p){
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struct timeval ref, orig, rx, tx;
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NTP64toTV(p->refts,ref);
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NTP64toTV(p->origts,orig);
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NTP64toTV(p->rxts,rx);
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NTP64toTV(p->txts,tx);
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printf("packet contents:\n");
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printf("\tflags: 0x%.2x\n", p->flags);
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printf("\t li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
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printf("\t vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
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printf("\t mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
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printf("\tstratum = %d\n", p->stratum);
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printf("\tpoll = %g\n", pow(2, p->poll));
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printf("\tprecision = %g\n", pow(2, p->precision));
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printf("\trtdelay = %-.16g\n", NTP32asDOUBLE(p->rtdelay));
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printf("\trtdisp = %-.16g\n", NTP32asDOUBLE(p->rtdisp));
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printf("\trefid = %x\n", p->refid);
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printf("\trefts = %-.16g\n", NTP64asDOUBLE(p->refts));
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printf("\torigts = %-.16g\n", NTP64asDOUBLE(p->origts));
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printf("\trxts = %-.16g\n", NTP64asDOUBLE(p->rxts));
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printf("\ttxts = %-.16g\n", NTP64asDOUBLE(p->txts));
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}
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void setup_request(ntp_message *p){
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struct timeval t;
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memset(p, 0, sizeof(ntp_message));
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LI_SET(p->flags, LI_ALARM);
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VN_SET(p->flags, 4);
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MODE_SET(p->flags, MODE_CLIENT);
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p->poll=4;
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p->precision=0xfa;
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L16(p->rtdelay)=htons(1);
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L16(p->rtdisp)=htons(1);
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gettimeofday(&t, NULL);
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TVtoNTP64(t,p->txts);
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}
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int process_arguments(int argc, char **argv){
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int c;
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int option=0;
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static struct option longopts[] = {
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{"verbose", no_argument, 0, 'v'},
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{"use-ipv4", no_argument, 0, '4'},
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/* {"use-ipv6", no_argument, 0, '6'}, */
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{"warning", required_argument, 0, 'w'},
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{"critical", required_argument, 0, 'c'},
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{"zero-offset", no_argument, 0, 'O'},
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{"jwarn", required_argument, 0, 'j'},
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{"jcrit", required_argument, 0, 'k'},
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{"timeout", required_argument, 0, 't'},
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{"hostname", required_argument, 0, 'H'},
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{0, 0, 0, 0}
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};
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if (argc < 2)
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usage ("\n");
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while (1) {
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c = getopt_long (argc, argv, "Vhv4w:c:Oj:k:t:H:", longopts, &option);
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if (c == -1 || c == EOF || c == 1)
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break;
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switch (c) {
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case 'h':
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print_help();
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exit(STATE_OK);
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break;
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case 'V':
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print_revision(progname, revision);
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exit(STATE_OK);
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break;
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case 'v':
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verbose = 1;
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break;
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case 'w':
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owarn = atof(optarg);
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break;
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case 'c':
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ocrit = atof(optarg);
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break;
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case 'j':
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do_jitter=1;
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jwarn = atof(optarg);
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break;
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case 'k':
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do_jitter=1;
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jcrit = atof(optarg);
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break;
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case 'H':
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if(is_host(optarg) == FALSE)
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usage2(_("Invalid hostname/address"), optarg);
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server_address = strdup(optarg);
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break;
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case 't':
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socket_timeout=atoi(optarg);
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break;
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case 'O':
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zero_offset_bad=1;
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break;
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case '?':
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/* print short usage statement if args not parsable */
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usage2 (_("Unknown argument"), optarg);
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break;
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}
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}
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if (ocrit < owarn){
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usage4(_("Critical offset should be larger than warning offset"));
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}
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if (ocrit < owarn){
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usage4(_("Critical jitter should be larger than warning jitter"));
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}
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if(server_address == NULL){
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usage4(_("Hostname was not supplied"));
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}
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return 0;
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}
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int main(int argc, char *argv[]){
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int result = STATE_UNKNOWN;
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int conn;
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ntp_message m;
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struct timeval recv_time;
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double offset=0, jitter=0;
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if (process_arguments (argc, argv) == ERROR)
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usage4 (_("Could not parse arguments"));
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/* initialize alarm signal handling */
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signal (SIGALRM, socket_timeout_alarm_handler);
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/* set socket timeout */
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alarm (socket_timeout);
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setup_request(&m);
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if(verbose) print_packet(&m);
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my_udp_connect(server_address, 123, &conn);
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write(conn, &m, sizeof(ntp_message));
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read(conn, &m, sizeof(ntp_message));
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gettimeofday(&recv_time, NULL);
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if(verbose) print_packet(&m);
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close(conn);
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offset=calc_offset(&m, &recv_time);
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printf("total offset: %g\n", offset);
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if(offset > ocrit){
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printf("NTP CRITICAL: ");
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result = STATE_CRITICAL;
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} else if(offset > owarn) {
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printf("NTP WARNING: ");
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result = STATE_WARNING;
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} else {
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printf("NTP OK: ");
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result = STATE_OK;
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}
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/* not implemented yet:
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jitter=calc_jitter(&m, &recv_time);
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if(do_jitter){
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if(offset > ocrit){
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printf("NTP CRITICAL: ");
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result = STATE_CRITICAL;
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} else if(offset > owarn) {
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printf("NTP WARNING: ");
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result = STATE_WARNING;
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} else {
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printf("NTP OK: ");
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result = STATE_OK;
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}
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}
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*/
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printf("Offset %g secs|offset=%g\n", offset, offset);
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if(server_address!=NULL) free(server_address);
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return result;
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}
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void print_usage(void){
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printf("\
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Usage: %s -H <host> [-O] [-w <warn>] [-c <crit>] [-j <warn>] [-k <crit>] [-v verbose]\
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\n", progname);
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}
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void print_help(void){
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print_revision(progname, revision);
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printf ("Copyright (c) 1999 Ethan Galstad\n");
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printf (COPYRIGHT, copyright, email);
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print_usage();
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printf (_(UT_HELP_VRSN));
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printf (_(UT_HOST_PORT), 'p', "123");
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printf (_(UT_WARN_CRIT));
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printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
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printf (_(UT_VERBOSE));
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printf(_(UT_SUPPORT));
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}
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