1 /**
2 * collectd - src/ntpd.c
3 * Copyright (C) 2006 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
25 #include "configfile.h"
26 #include "utils_debug.h"
28 #define MODULE_NAME "ntpd"
30 #if HAVE_SYS_SOCKET_H
31 # define NTPD_HAVE_READ 1
32 #else
33 # define NTPD_HAVE_READ 0
34 #endif
36 #if HAVE_STDINT_H
37 # include <stdint.h>
38 #endif
39 #if HAVE_NETDB_H
40 # include <netdb.h>
41 #endif
42 #if HAVE_SYS_SOCKET_H
43 # include <sys/socket.h>
44 #endif
45 #if HAVE_NETINET_IN_H
46 # include <netinet/in.h>
47 #endif
48 #if HAVE_NETINET_TCP_H
49 # include <netinet/tcp.h>
50 #endif
51 #if HAVE_SYS_POLL_H
52 # include <sys/poll.h>
53 #endif
55 /* drift */
56 static char *time_offset_file = "ntpd/time_offset-%s.rrd";
57 static char *time_offset_ds_def[] =
58 {
59 "DS:ms:GAUGE:"COLLECTD_HEARTBEAT":-1000000:1000000",
60 NULL
61 };
62 static int time_offset_ds_num = 1;
64 static char *frequency_offset_file = "ntpd/frequency_offset-%s.rrd";
65 static char *frequency_offset_ds_def[] =
66 {
67 "DS:ppm:GAUGE:"COLLECTD_HEARTBEAT":-1000000:1000000",
68 NULL
69 };
70 static int frequency_offset_ds_num = 1;
72 #if NTPD_HAVE_READ
73 # define NTPD_DEFAULT_HOST "localhost"
74 # define NTPD_DEFAULT_PORT "123"
75 static int sock_descr = -1;
76 static char *ntpd_host = NULL;
77 static char *ntpd_port = NULL;
78 #endif
80 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
81 * The following definitions were copied from the NTPd distribution *
82 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
83 #define MAXFILENAME 128
84 #define MAXSEQ 127
85 #define MODE_PRIVATE 7
86 #define NTP_OLDVERSION ((u_char) 1) /* oldest credible version */
87 #define IMPL_XNTPD 3
88 #define FP_FRAC 65536.0
90 /* This structure is missing the message authentication code, since collectd
91 * doesn't use it. */
92 struct req_pkt
93 {
94 uint8_t rm_vn_mode;
95 uint8_t auth_seq;
96 uint8_t implementation; /* implementation number */
97 uint8_t request; /* request number */
98 uint16_t err_nitems; /* error code/number of data items */
99 uint16_t mbz_itemsize; /* item size */
100 char data[MAXFILENAME + 48]; /* data area [32 prev](176 byte max) */
101 /* struct conf_peer must fit */
102 };
103 #define REQ_LEN_NOMAC (sizeof(struct req_pkt))
105 /*
106 * A response packet. The length here is variable, this is a
107 * maximally sized one. Note that this implementation doesn't
108 * authenticate responses.
109 */
110 #define RESP_HEADER_SIZE (8)
111 #define RESP_DATA_SIZE (500)
113 struct resp_pkt
114 {
115 uint8_t rm_vn_mode; /* response, more, version, mode */
116 uint8_t auth_seq; /* key, sequence number */
117 uint8_t implementation; /* implementation number */
118 uint8_t request; /* request number */
119 uint16_t err_nitems; /* error code/number of data items */
120 uint16_t mbz_itemsize; /* item size */
121 char data[RESP_DATA_SIZE]; /* data area */
122 };
124 /*
125 * Bit setting macros for multifield items.
126 */
127 #define RESP_BIT 0x80
128 #define MORE_BIT 0x40
130 #define ISRESPONSE(rm_vn_mode) (((rm_vn_mode)&RESP_BIT)!=0)
131 #define ISMORE(rm_vn_mode) (((rm_vn_mode)&MORE_BIT)!=0)
132 #define INFO_VERSION(rm_vn_mode) ((u_char)(((rm_vn_mode)>>3)&0x7))
133 #define INFO_MODE(rm_vn_mode) ((rm_vn_mode)&0x7)
135 #define RM_VN_MODE(resp, more, version) \
136 ((u_char)(((resp)?RESP_BIT:0)\
137 |((more)?MORE_BIT:0)\
138 |((version?version:(NTP_OLDVERSION+1))<<3)\
139 |(MODE_PRIVATE)))
141 #define INFO_IS_AUTH(auth_seq) (((auth_seq) & 0x80) != 0)
142 #define INFO_SEQ(auth_seq) ((auth_seq)&0x7f)
143 #define AUTH_SEQ(auth, seq) ((u_char)((((auth)!=0)?0x80:0)|((seq)&0x7f)))
145 #define INFO_ERR(err_nitems) ((u_short)((ntohs(err_nitems)>>12)&0xf))
146 #define INFO_NITEMS(err_nitems) ((u_short)(ntohs(err_nitems)&0xfff))
147 #define ERR_NITEMS(err, nitems) (htons((u_short)((((u_short)(err)<<12)&0xf000)\
148 |((u_short)(nitems)&0xfff))))
150 #define INFO_MBZ(mbz_itemsize) ((ntohs(mbz_itemsize)>>12)&0xf)
151 #define INFO_ITEMSIZE(mbz_itemsize) ((u_short)(ntohs(mbz_itemsize)&0xfff))
152 #define MBZ_ITEMSIZE(itemsize) (htons((u_short)(itemsize)))
154 /* negate a long float type */
155 #define M_NEG(v_i, v_f) \
156 do { \
157 if ((v_f) == 0) \
158 (v_i) = -((uint32_t)(v_i)); \
159 else { \
160 (v_f) = -((uint32_t)(v_f)); \
161 (v_i) = ~(v_i); \
162 } \
163 } while(0)
164 /* l_fp to double */
165 #define M_LFPTOD(r_i, r_uf, d) \
166 do { \
167 register int32_t i; \
168 register uint32_t f; \
169 \
170 i = (r_i); \
171 f = (r_uf); \
172 if (i < 0) { \
173 M_NEG(i, f); \
174 (d) = -((double) i + ((double) f) / 4294967296.0); \
175 } else { \
176 (d) = (double) i + ((double) f) / 4294967296.0; \
177 } \
178 } while (0)
180 #define REQ_PEER_LIST_SUM 1
181 struct info_peer_summary
182 {
183 uint32_t dstadr; /* local address (zero for undetermined) */
184 uint32_t srcadr; /* source address */
185 uint16_t srcport; /* source port */
186 uint8_t stratum; /* stratum of peer */
187 int8_t hpoll; /* host polling interval */
188 int8_t ppoll; /* peer polling interval */
189 uint8_t reach; /* reachability register */
190 uint8_t flags; /* flags, from above */
191 uint8_t hmode; /* peer mode */
192 int32_t delay; /* peer.estdelay; s_fp */
193 int32_t offset_int; /* peer.estoffset; integral part */
194 int32_t offset_frc; /* peer.estoffset; fractional part */
195 uint32_t dispersion; /* peer.estdisp; u_fp */
196 uint32_t v6_flag; /* is this v6 or not */
197 uint32_t unused1; /* (unused) padding for dstadr6 */
198 struct in6_addr dstadr6; /* local address (v6) */
199 struct in6_addr srcadr6; /* source address (v6) */
200 };
202 #define REQ_SYS_INFO 4
203 struct info_sys
204 {
205 uint32_t peer; /* system peer address (v4) */
206 uint8_t peer_mode; /* mode we are syncing to peer in */
207 uint8_t leap; /* system leap bits */
208 uint8_t stratum; /* our stratum */
209 int8_t precision; /* local clock precision */
210 int32_t rootdelay; /* distance from sync source */
211 uint32_t rootdispersion; /* dispersion from sync source */
212 uint32_t refid; /* reference ID of sync source */
213 uint64_t reftime; /* system reference time */
214 uint32_t poll; /* system poll interval */
215 uint8_t flags; /* system flags */
216 uint8_t unused1; /* unused */
217 uint8_t unused2; /* unused */
218 uint8_t unused3; /* unused */
219 int32_t bdelay; /* default broadcast offset */
220 int32_t frequency; /* frequency residual (scaled ppm) */
221 uint64_t authdelay; /* default authentication delay */
222 uint32_t stability; /* clock stability (scaled ppm) */
223 int32_t v6_flag; /* is this v6 or not */
224 int32_t unused4; /* unused, padding for peer6 */
225 struct in6_addr peer6; /* system peer address (v6) */
226 };
228 #define REQ_GET_KERNEL 38
229 struct info_kernel
230 {
231 int32_t offset;
232 int32_t freq;
233 int32_t maxerror;
234 int32_t esterror;
235 uint16_t status;
236 uint16_t shift;
237 int32_t constant;
238 int32_t precision;
239 int32_t tolerance;
240 /* pps stuff */
241 int32_t ppsfreq;
242 int32_t jitter;
243 int32_t stabil;
244 int32_t jitcnt;
245 int32_t calcnt;
246 int32_t errcnt;
247 int32_t stbcnt;
248 };
249 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
250 * End of the copied stuff.. *
251 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
253 static void ntpd_init (void)
254 {
255 return;
256 }
258 static void ntpd_write_time_offset (char *host, char *inst, char *val)
259 {
260 char buf[256];
261 int status;
263 status = snprintf (buf, 256, time_offset_file, inst);
264 if ((status < 1) || (status >= 256))
265 return;
267 rrd_update_file (host, buf, val,
268 time_offset_ds_def, time_offset_ds_num);
269 }
271 static void ntpd_write_frequency_offset (char *host, char *inst, char *val)
272 {
273 char buf[256];
274 int status;
276 status = snprintf (buf, 256, frequency_offset_file, inst);
277 if ((status < 1) || (status >= 256))
278 return;
280 rrd_update_file (host, buf, val,
281 frequency_offset_ds_def, frequency_offset_ds_num);
282 }
284 #if NTPD_HAVE_READ
285 static void ntpd_submit (char *type, char *inst, double value)
286 {
287 char buf[256];
289 if (snprintf (buf, 256, "%u:%.8f", (unsigned int) curtime, value) >= 256)
290 return;
292 DBG ("type = %s; inst = %s; value = %s;",
293 type, inst, buf);
295 plugin_submit (type, inst, buf);
296 }
298 /* returns `tv0 - tv1' in milliseconds or 0 if `tv1 > tv0' */
299 static int timeval_sub (const struct timeval *tv0, const struct timeval *tv1)
300 {
301 int sec;
302 int usec;
304 if ((tv0->tv_sec < tv1->tv_sec)
305 || ((tv0->tv_sec == tv1->tv_sec) && (tv0->tv_usec < tv1->tv_usec)))
306 return (0);
308 sec = tv0->tv_sec - tv1->tv_sec;
309 usec = tv0->tv_usec - tv1->tv_usec;
311 while (usec < 0)
312 {
313 usec += 1000000;
314 sec -= 1;
315 }
317 if (sec < 0)
318 return (0);
320 return ((sec * 1000) + ((usec + 500) / 1000));
321 }
323 static int ntpd_connect (void)
324 {
325 char *host;
326 char *port;
328 struct addrinfo ai_hints;
329 struct addrinfo *ai_list;
330 struct addrinfo *ai_ptr;
331 int status;
333 if (sock_descr >= 0)
334 return (sock_descr);
336 DBG ("Opening a new socket");
338 host = ntpd_host;
339 if (host == NULL)
340 host = NTPD_DEFAULT_HOST;
342 port = ntpd_port;
343 if (port == NULL)
344 port = NTPD_DEFAULT_PORT;
346 memset (&ai_hints, '\0', sizeof (ai_hints));
347 ai_hints.ai_flags = AI_ADDRCONFIG;
348 ai_hints.ai_family = PF_UNSPEC;
349 ai_hints.ai_socktype = SOCK_DGRAM;
350 ai_hints.ai_protocol = IPPROTO_UDP;
352 if ((status = getaddrinfo (host, port, &ai_hints, &ai_list)) != 0)
353 {
354 DBG ("getaddrinfo (%s, %s): %s",
355 host, port,
356 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
357 syslog (LOG_ERR, "ntpd plugin: getaddrinfo (%s, %s): %s",
358 host, port,
359 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
360 return (-1);
361 }
363 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
364 {
365 /* create our socket descriptor */
366 if ((sock_descr = socket (ai_ptr->ai_family,
367 ai_ptr->ai_socktype,
368 ai_ptr->ai_protocol)) < 0)
369 continue;
371 /* connect to the ntpd */
372 if (connect (sock_descr, ai_ptr->ai_addr, ai_ptr->ai_addrlen))
373 {
374 close (sock_descr);
375 sock_descr = -1;
376 continue;
377 }
379 break;
380 }
382 freeaddrinfo (ai_list);
384 if (sock_descr < 0)
385 {
386 DBG ("Unable to connect to server.");
387 syslog (LOG_ERR, "ntpd plugin: Unable to connect to server.");
388 }
390 return (sock_descr);
391 }
393 /* For a description of the arguments see `ntpd_do_query' below. */
394 static int ntpd_receive_response (int req_code, int *res_items, int *res_size,
395 char **res_data, int res_item_size)
396 {
397 int sd;
398 struct pollfd poll_s;
399 struct resp_pkt res;
400 int status;
401 int done;
402 int i;
404 char *items;
405 size_t items_num;
407 struct timeval time_end;
408 struct timeval time_now;
409 int timeout;
411 int pkt_item_num; /* items in this packet */
412 int pkt_item_len; /* size of the items in this packet */
413 int pkt_sequence;
414 char pkt_recvd[MAXSEQ+1]; /* sequence numbers that have been received */
415 int pkt_recvd_num; /* number of packets that have been received */
416 int pkt_lastseq; /* the last sequence number */
417 ssize_t pkt_padding; /* Padding in this packet */
419 if ((sd = ntpd_connect ()) < 0)
420 return (-1);
422 items = NULL;
423 items_num = 0;
425 memset (pkt_recvd, '\0', sizeof (pkt_recvd));
426 pkt_recvd_num = 0;
427 pkt_lastseq = -1;
429 *res_items = 0;
430 *res_size = 0;
431 *res_data = NULL;
433 if (gettimeofday (&time_end, NULL) < 0)
434 {
435 syslog (LOG_ERR, "ntpd plugin: gettimeofday failed: %s",
436 strerror (errno));
437 return (-1);
438 }
439 time_end.tv_sec++; /* wait for a most one second */
441 done = 0;
442 while (done == 0)
443 {
444 if (gettimeofday (&time_now, NULL) < 0)
445 {
446 syslog (LOG_ERR, "ntpd plugin: gettimeofday failed: %s",
447 strerror (errno));
448 return (-1);
449 }
451 /* timeout reached */
452 if ((timeout = timeval_sub (&time_end, &time_now)) == 0)
453 break;
455 poll_s.fd = sd;
456 poll_s.events = POLLIN | POLLPRI;
457 poll_s.revents = 0;
459 DBG ("Polling for %ims", timeout);
460 status = poll (&poll_s, 1, timeout);
462 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
463 continue;
465 if (status < 0)
466 {
467 DBG ("poll failed: %s", strerror (errno));
468 syslog (LOG_ERR, "ntpd plugin: poll failed: %s",
469 strerror (errno));
470 return (-1);
471 }
473 if (status == 0) /* timeout */
474 {
475 DBG ("timeout reached.");
476 break;
477 }
479 memset ((void *) &res, '\0', sizeof (res));
480 status = recv (sd, (void *) &res, sizeof (res), 0 /* no flags */);
482 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
483 continue;
485 if (status < 0)
486 {
487 DBG ("recv(2) failed: %s", strerror (errno));
488 return (-1);
489 }
491 DBG ("recv'd %i bytes", status);
493 /*
494 * Do some sanity checks first
495 */
496 if (status < RESP_HEADER_SIZE)
497 {
498 syslog (LOG_WARNING, "ntpd plugin: Short (%i bytes) packet received",
499 (int) status);
500 continue;
501 }
502 if (INFO_MODE (res.rm_vn_mode) != MODE_PRIVATE)
503 {
504 syslog (LOG_NOTICE, "ntpd plugin: Packet received with mode %i",
505 INFO_MODE (res.rm_vn_mode));
506 continue;
507 }
508 if (INFO_IS_AUTH (res.auth_seq))
509 {
510 syslog (LOG_NOTICE, "ntpd plugin: Encrypted packet received");
511 continue;
512 }
513 if (!ISRESPONSE (res.rm_vn_mode))
514 {
515 syslog (LOG_NOTICE, "ntpd plugin: Received request packet, "
516 "wanted response");
517 continue;
518 }
519 if (INFO_MBZ (res.mbz_itemsize))
520 {
521 syslog (LOG_WARNING, "ntpd plugin: Received packet with nonzero "
522 "MBZ field!");
523 continue;
524 }
525 if (res.implementation != IMPL_XNTPD)
526 {
527 syslog (LOG_WARNING, "ntpd plugin: Asked for request of type %i, "
528 "got %i", (int) IMPL_XNTPD, (int) res.implementation);
529 continue;
530 }
532 /* Check for error code */
533 if (INFO_ERR (res.err_nitems) != 0)
534 {
535 syslog (LOG_ERR, "ntpd plugin: Received error code %i",
536 (int) INFO_ERR(res.err_nitems));
537 return ((int) INFO_ERR (res.err_nitems));
538 }
540 /* extract number of items in this packet and the size of these items */
541 pkt_item_num = INFO_NITEMS (res.err_nitems);
542 pkt_item_len = INFO_ITEMSIZE (res.mbz_itemsize);
543 DBG ("pkt_item_num = %i; pkt_item_len = %i;",
544 pkt_item_num, pkt_item_len);
546 /* Check if the reported items fit in the packet */
547 if ((pkt_item_num * pkt_item_len) > (status - RESP_HEADER_SIZE))
548 {
549 syslog (LOG_ERR, "ntpd plugin: %i items * %i bytes > "
550 "%i bytes - %i bytes header",
551 (int) pkt_item_num, (int) pkt_item_len,
552 (int) status, (int) RESP_HEADER_SIZE);
553 continue;
554 }
556 /* If this is the first packet (time wise, not sequence wise),
557 * set `res_size'. If it's not the first packet check if the
558 * items have the same size. Discard invalid packets. */
559 if (items_num == 0) /* first packet */
560 {
561 DBG ("*res_size = %i", pkt_item_len);
562 *res_size = pkt_item_len;
563 }
564 else if (*res_size != pkt_item_len)
565 {
566 DBG ("Error: *res_size = %i; pkt_item_len = %i;",
567 *res_size, pkt_item_len);
568 syslog (LOG_ERR, "Item sizes differ.");
569 continue;
570 }
572 /* Calculate the padding. No idea why there might be any padding.. */
573 pkt_padding = 0;
574 if (res_item_size > pkt_item_len)
575 pkt_padding = res_item_size - pkt_item_len;
576 DBG ("res_item_size = %i; pkt_padding = %i;",
577 res_item_size, pkt_padding);
579 /* Extract the sequence number */
580 pkt_sequence = INFO_SEQ (res.auth_seq);
581 if ((pkt_sequence < 0) || (pkt_sequence > MAXSEQ))
582 {
583 syslog (LOG_ERR, "ntpd plugin: Received packet with sequence %i",
584 pkt_sequence);
585 continue;
586 }
588 /* Check if this sequence has been received before. If so, discard it. */
589 if (pkt_recvd[pkt_sequence] != '\0')
590 {
591 syslog (LOG_NOTICE, "ntpd plugin: Sequence %i received twice",
592 pkt_sequence);
593 continue;
594 }
596 /* If `pkt_lastseq != -1' another packet without `more bit' has
597 * been received. */
598 if (!ISMORE (res.rm_vn_mode))
599 {
600 if (pkt_lastseq != -1)
601 {
602 syslog (LOG_ERR, "ntpd plugin: Two packets which both "
603 "claim to be the last one in the "
604 "sequence have been received.");
605 continue;
606 }
607 pkt_lastseq = pkt_sequence;
608 DBG ("Last sequence = %i;", pkt_lastseq);
609 }
611 /*
612 * Enough with the checks. Copy the data now.
613 * We start by allocating some more memory.
614 */
615 DBG ("realloc (%p, %i)", (void *) *res_data,
616 (items_num + pkt_item_num) * res_item_size);
617 items = realloc ((void *) *res_data,
618 (items_num + pkt_item_num) * res_item_size);
619 if (items == NULL)
620 {
621 items = *res_data;
622 syslog (LOG_ERR, "ntpd plugin: realloc failed.");
623 continue;
624 }
625 *res_data = items;
627 for (i = 0; i < pkt_item_num; i++)
628 {
629 void *dst = (void *) (*res_data + ((*res_items) * res_item_size));
630 void *src = (void *) (((char *) res.data) + (i * pkt_item_len));
632 /* Set the padding to zeros */
633 if (pkt_padding != 0)
634 memset (dst, '\0', res_item_size);
635 memcpy (dst, src, (size_t) pkt_item_len);
637 (*res_items)++;
638 }
640 pkt_recvd[pkt_sequence] = (char) 1;
641 pkt_recvd_num++;
643 if ((pkt_recvd_num - 1) == pkt_lastseq)
644 done = 1;
645 } /* while (done == 0) */
647 return (0);
648 }
650 /* For a description of the arguments see `ntpd_do_query' below. */
651 static int ntpd_send_request (int req_code, int req_items, int req_size, char *req_data)
652 {
653 int sd;
654 struct req_pkt req;
655 size_t req_data_len;
656 int status;
658 assert (req_items >= 0);
659 assert (req_size >= 0);
661 if ((sd = ntpd_connect ()) < 0)
662 return (-1);
664 memset ((void *) &req, '\0', sizeof (req));
665 req.rm_vn_mode = RM_VN_MODE(0, 0, 0);
666 req.auth_seq = AUTH_SEQ (0, 0);
667 req.implementation = IMPL_XNTPD;
668 req.request = (unsigned char) req_code;
670 req_data_len = (size_t) (req_items * req_size);
672 assert (((req_data != NULL) && (req_data_len > 0))
673 || ((req_data == NULL) && (req_items == 0) && (req_size == 0)));
675 req.err_nitems = ERR_NITEMS (0, req_items);
676 req.mbz_itemsize = MBZ_ITEMSIZE (req_size);
678 if (req_data != NULL)
679 memcpy ((void *) req.data, (const void *) req_data, req_data_len);
681 DBG ("req_items = %i; req_size = %i; req_data = %p;",
682 req_items, req_size, (void *) req_data);
684 status = swrite (sd, (const char *) &req, REQ_LEN_NOMAC);
685 if (status < 0)
686 return (status);
688 return (0);
689 }
691 /*
692 * ntpd_do_query:
693 *
694 * req_code: Type of request packet
695 * req_items: Numver of items in the request
696 * req_size: Size of one item in the request
697 * req_data: Data of the request packet
698 * res_items: Pointer to where the number returned items will be stored.
699 * res_size: Pointer to where the size of one returned item will be stored.
700 * res_data: This is where a pointer to the (allocated) data will be stored.
701 * res_item_size: Size of one returned item. (used to calculate padding)
702 *
703 * returns: zero upon success, non-zero otherwise.
704 */
705 static int ntpd_do_query (int req_code, int req_items, int req_size, char *req_data,
706 int *res_items, int *res_size, char **res_data, int res_item_size)
707 {
708 int status;
710 status = ntpd_send_request (req_code, req_items, req_size, req_data);
711 if (status != 0)
712 return (status);
714 status = ntpd_receive_response (req_code, res_items, res_size, res_data,
715 res_item_size);
716 return (status);
717 }
719 static double ntpd_read_fp (int32_t val_int)
720 {
721 double val_double;
723 val_int = ntohl (val_int);
724 val_double = ((double) val_int) / FP_FRAC;
726 return (val_double);
727 }
729 static void ntpd_read (void)
730 {
731 struct info_kernel *ik;
732 int ik_num;
733 int ik_size;
735 struct info_peer_summary *ps;
736 int ps_num;
737 int ps_size;
739 int status;
740 int i;
742 ik = NULL;
743 ik_num = 0;
744 ik_size = 0;
746 status = ntpd_do_query (REQ_GET_KERNEL,
747 0, 0, NULL, /* request data */
748 &ik_num, &ik_size, (char **) ((void *) &ik), /* response data */
749 sizeof (struct info_kernel));
751 if (status != 0)
752 {
753 DBG ("ntpd_do_query failed with status %i", status);
754 return;
755 }
756 if ((ik == NULL) || (ik_num == 0) || (ik_size == 0))
757 {
758 DBG ("ntpd_do_query returned: ik = %p; ik_num = %i; ik_size = %i;",
759 (void *) ik, ik_num, ik_size);
760 return;
761 }
763 /* kerninfo -> estimated error */
765 DBG ("info_kernel:\n"
766 " pll offset = %.8f\n"
767 " pll frequency = %.8f\n" /* drift compensation */
768 " est error = %.8f\n",
769 ntpd_read_fp (ik->offset),
770 ntpd_read_fp (ik->freq),
771 ntpd_read_fp (ik->esterror));
773 ntpd_submit ("ntpd_frequency_offset", "loop", ntpd_read_fp (ik->freq));
774 ntpd_submit ("ntpd_time_offset", "loop", ntpd_read_fp (ik->offset));
775 ntpd_submit ("ntpd_time_offset", "error", ntpd_read_fp (ik->esterror));
777 free (ik);
778 ik = NULL;
780 status = ntpd_do_query (REQ_PEER_LIST_SUM,
781 0, 0, NULL, /* request data */
782 &ps_num, &ps_size, (char **) ((void *) &ps), /* response data */
783 sizeof (struct info_peer_summary));
784 if (status != 0)
785 {
786 DBG ("ntpd_do_query failed with status %i", status);
787 return;
788 }
789 if ((ps == NULL) || (ps_num == 0) || (ps_size == 0))
790 {
791 DBG ("ntpd_do_query returned: ps = %p; ps_num = %i; ps_size = %i;",
792 (void *) ps, ps_num, ps_size);
793 return;
794 }
796 for (i = 0; i < ps_num; i++)
797 {
798 struct info_peer_summary *ptr;
799 double offset;
800 ptr = ps + i;
802 if (((ntohl (ptr->dstadr) & 0x7F000000) == 0x7F000000) || (ptr->dstadr == 0))
803 continue;
805 /* Convert the `long floating point' offset value to double */
806 M_LFPTOD (ntohl (ptr->offset_int), ntohl (ptr->offset_frc), offset);
808 DBG ("peer %i:\n"
809 " srcadr = 0x%08x\n"
810 " delay = %f\n"
811 " offset_int = %i\n"
812 " offset_frc = %i\n"
813 " offset = %f\n"
814 " dispersion = %f\n",
815 i,
816 ntohl (ptr->srcadr),
817 ntpd_read_fp (ptr->delay),
818 ntohl (ptr->offset_int),
819 ntohl (ptr->offset_frc),
820 offset,
821 ntpd_read_fp (ptr->dispersion));
822 }
824 free (ps);
825 ps = NULL;
827 return;
828 }
829 #else
830 # define ntpd_read NULL
831 #endif /* NTPD_HAVE_READ */
833 void module_register (void)
834 {
835 plugin_register (MODULE_NAME, ntpd_init, ntpd_read, NULL);
836 plugin_register ("ntpd_time_offset", NULL, NULL, ntpd_write_time_offset);
837 plugin_register ("ntpd_frequency_offset", NULL, NULL, ntpd_write_frequency_offset);
838 }
840 #undef MODULE_NAME