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diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
index 56e5a05d9f034957ce01dbe6e3be69bf15b8e27a..fdbdc141281868e9c3510f36a40806f060a55b99 100644 (file)
--- a/plugins/check_ntp.c
+++ b/plugins/check_ntp.c
-/******************************************************************************
- check_ntp.c: utility to check ntp servers independant of any commandline
- programs or external libraries.
- original author: sean finney <seanius@seanius.net>
- ******************************************************************************
- 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
- 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
-
+/*****************************************************************************
+*
+* 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 *revision = "$Revision$";
-const char *copyright = "2006";
+const char *copyright = "2006-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
#include "common.h"
static char *server_address=NULL;
static int verbose=0;
-static int zero_offset_bad=0;
-static double owarn=0;
-static double ocrit=0;
+static short do_offset=0;
+static char *owarn="60";
+static char *ocrit="120";
static short do_jitter=0;
-static double jwarn=0;
-static double jcrit=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 */
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 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 :)
+ 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"
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)); \
+ t.tv_usec=(int)(0.5+(double)(ntohl(R32(n))/4294.967296)); \
} \
}while(0)
do{ if(!t.tv_usec && !t.tv_sec) n=0x0UL; \
else { \
L32(n)=htonl(t.tv_sec + EPOCHDIFF); \
- R32(n)=htonl((4294.967296*t.tv_usec)+.5); \
+ 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, rtdelay;
+ 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));
- rtdelay=NTP32asDOUBLE(m->rtdelay);
- return (.5*((peer_tx-client_rx)+(peer_rx-client_tx)))-rtdelay;
+ return (.5*((peer_tx-client_rx)+(peer_rx-client_tx)));
}
/* print out a ntp packet in human readable/debuggable format */
-void print_packet(const ntp_message *p){
+void print_ntp_message(const ntp_message *p){
struct timeval ref, orig, rx, tx;
NTP64toTV(p->refts,ref);
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;
VN_SET(p->flags, 4);
MODE_SET(p->flags, MODE_CLIENT);
p->poll=4;
- p->precision=0xfa;
+ p->precision=(int8_t)0xfa;
L16(p->rtdelay)=htons(1);
L16(p->rtdisp)=htons(1);
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;
{"use-ipv6", no_argument, 0, '6'},
{"warning", required_argument, 0, 'w'},
{"critical", required_argument, 0, 'c'},
- {"zero-offset", no_argument, 0, 'O'},
{"jwarn", required_argument, 0, 'j'},
{"jcrit", required_argument, 0, 'k'},
{"timeout", required_argument, 0, 't'},
{0, 0, 0, 0}
};
-
+
if (argc < 2)
usage ("\n");
while (1) {
- c = getopt_long (argc, argv, "Vhv46w:c:Oj:k:t:H:", longopts, &option);
+ c = getopt_long (argc, argv, "Vhv46w:c:j:k:t:H:", longopts, &option);
if (c == -1 || c == EOF || c == 1)
break;
exit(STATE_OK);
break;
case 'V':
- print_revision(progname, revision);
+ print_revision(progname, NP_VERSION);
exit(STATE_OK);
break;
case 'v':
- verbose = 1;
+ verbose++;
break;
case 'w':
- owarn = atof(optarg);
+ do_offset=1;
+ owarn = optarg;
break;
case 'c':
- ocrit = atof(optarg);
+ do_offset=1;
+ ocrit = optarg;
break;
case 'j':
do_jitter=1;
- jwarn = atof(optarg);
+ jwarn = optarg;
break;
case 'k':
do_jitter=1;
- jcrit = atof(optarg);
+ jcrit = optarg;
break;
case 'H':
if(is_host(optarg) == FALSE)
case 't':
socket_timeout=atoi(optarg);
break;
- case 'O':
- zero_offset_bad=1;
- break;
case '4':
address_family = AF_INET;
break;
break;
case '?':
/* print short usage statement if args not parsable */
- usage2 (_("Unknown argument"), optarg);
+ usage5 ();
break;
}
}
- 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, 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 = STATE_UNKNOWN;
- int conn;
- ntp_message m;
- struct timeval recv_time;
+ 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);
- setup_request(&m);
- if(verbose) print_packet(&m);
- my_udp_connect(server_address, 123, &conn);
- write(conn, &m, sizeof(ntp_message));
- read(conn, &m, sizeof(ntp_message));
- gettimeofday(&recv_time, NULL);
- if(verbose) print_packet(&m);
- close(conn);
-
- offset=calc_offset(&m, &recv_time);
- printf("total offset: %g\n", offset);
-
- if(offset > ocrit){
- printf("NTP CRITICAL: ");
+ 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 if(offset > owarn) {
- printf("NTP WARNING: ");
- result = STATE_WARNING;
} else {
- printf("NTP OK: ");
- result = STATE_OK;
+ result = get_status(fabs(offset), offset_thresholds);
}
- /* not implemented yet:
- jitter=calc_jitter(&m, &recv_time);
-
+ /* 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){
- if(offset > ocrit){
- printf("NTP CRITICAL: ");
- result = STATE_CRITICAL;
- } else if(offset > owarn) {
- printf("NTP WARNING: ");
- result = STATE_WARNING;
- } else {
- printf("NTP OK: ");
- result = STATE_OK;
- }
+ 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);
- printf("Offset %g secs|offset=%g\n", offset, offset);
+ 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_usage(void){
- printf("\
-Usage: %s -H <host> [-O] [-w <warn>] [-c <crit>] [-j <warn>] [-k <crit>] [-v verbose]\
-\n", progname);
-}
void print_help(void){
- print_revision(progname, revision);
+ print_revision(progname, NP_VERSION);
- printf ("Copyright (c) 1999 Ethan Galstad\n");
+ 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 (_(UT_WARN_CRIT));
+ 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(_(UT_SUPPORT));
+
+ 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);
}