2 * collectd - src/ntpd.c
3 * Copyright (C) 2006-2012 Florian octo Forster
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Florian octo Forster <octo at collectd.org>
27 #define _DEFAULT_SOURCE
28 #define _BSD_SOURCE /* For NI_MAXHOST */
42 #include <netinet/in.h>
45 #include <arpa/inet.h> /* inet_ntoa */
47 #if HAVE_NETINET_TCP_H
48 #include <netinet/tcp.h>
55 #define STA_NANO 0x2000
58 static const char *config_keys[] = {"Host", "Port", "ReverseLookups",
60 static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
62 static _Bool do_reverse_lookups = 1;
64 /* This option only exists for backward compatibility. If it is false and two
65 * ntpd peers use the same refclock driver, the plugin will try to write
66 * simultaneous measurements from both to the same type instance. */
67 static _Bool include_unit_id = 0;
69 #define NTPD_DEFAULT_HOST "localhost"
70 #define NTPD_DEFAULT_PORT "123"
71 static int sock_descr = -1;
72 static char *ntpd_host = NULL;
73 static char ntpd_port[16];
75 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
76 * The following definitions were copied from the NTPd distribution *
77 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
78 #define MAXFILENAME 128
80 #define MODE_PRIVATE 7
81 #define NTP_OLDVERSION ((uint8_t)1) /* oldest credible version */
83 #define FP_FRAC 65536.0
85 #define REFCLOCK_ADDR 0x7f7f0000 /* 127.127.0.0 */
86 #define REFCLOCK_MASK 0xffff0000 /* 255.255.0.0 */
88 /* This structure is missing the message authentication code, since collectd
93 uint8_t implementation; /* implementation number */
94 uint8_t request; /* request number */
95 uint16_t err_nitems; /* error code/number of data items */
96 uint16_t mbz_itemsize; /* item size */
97 char data[MAXFILENAME + 48]; /* data area [32 prev](176 byte max) */
98 /* struct conf_peer must fit */
100 #define REQ_LEN_NOMAC (sizeof(struct req_pkt))
103 * A response packet. The length here is variable, this is a
104 * maximally sized one. Note that this implementation doesn't
105 * authenticate responses.
107 #define RESP_HEADER_SIZE (8)
108 #define RESP_DATA_SIZE (500)
111 uint8_t rm_vn_mode; /* response, more, version, mode */
112 uint8_t auth_seq; /* key, sequence number */
113 uint8_t implementation; /* implementation number */
114 uint8_t request; /* request number */
115 uint16_t err_nitems; /* error code/number of data items */
116 uint16_t mbz_itemsize; /* item size */
117 char data[RESP_DATA_SIZE]; /* data area */
121 * Bit setting macros for multifield items.
123 #define RESP_BIT 0x80
124 #define MORE_BIT 0x40
126 #define ISRESPONSE(rm_vn_mode) (((rm_vn_mode)&RESP_BIT) != 0)
127 #define ISMORE(rm_vn_mode) (((rm_vn_mode)&MORE_BIT) != 0)
128 #define INFO_VERSION(rm_vn_mode) ((uint8_t)(((rm_vn_mode) >> 3) & 0x7))
129 #define INFO_MODE(rm_vn_mode) ((rm_vn_mode)&0x7)
131 #define RM_VN_MODE(resp, more, version) \
132 ((uint8_t)(((resp) ? RESP_BIT : 0) | ((more) ? MORE_BIT : 0) | \
133 ((version ? version : (NTP_OLDVERSION + 1)) << 3) | \
136 #define INFO_IS_AUTH(auth_seq) (((auth_seq)&0x80) != 0)
137 #define INFO_SEQ(auth_seq) ((auth_seq)&0x7f)
138 #define AUTH_SEQ(auth, seq) \
139 ((uint8_t)((((auth) != 0) ? 0x80 : 0) | ((seq)&0x7f)))
141 #define INFO_ERR(err_nitems) ((uint16_t)((ntohs(err_nitems) >> 12) & 0xf))
142 #define INFO_NITEMS(err_nitems) ((uint16_t)(ntohs(err_nitems) & 0xfff))
143 #define ERR_NITEMS(err, nitems) \
144 (htons((uint16_t)((((uint16_t)(err) << 12) & 0xf000) | \
145 ((uint16_t)(nitems)&0xfff))))
147 #define INFO_MBZ(mbz_itemsize) ((ntohs(mbz_itemsize) >> 12) & 0xf)
148 #define INFO_ITEMSIZE(mbz_itemsize) ((uint16_t)(ntohs(mbz_itemsize) & 0xfff))
149 #define MBZ_ITEMSIZE(itemsize) (htons((uint16_t)(itemsize)))
151 /* negate a long float type */
152 #define M_NEG(v_i, v_f) \
155 (v_i) = -((uint32_t)(v_i)); \
157 (v_f) = -((uint32_t)(v_f)); \
162 #define M_LFPTOD(r_i, r_uf, d) \
164 register int32_t ri; \
165 register uint32_t rf; \
171 (d) = -((double)ri + ((double)rf) / 4294967296.0); \
173 (d) = (double)ri + ((double)rf) / 4294967296.0; \
177 #define REQ_PEER_LIST_SUM 1
178 struct info_peer_summary {
179 uint32_t dstadr; /* local address (zero for undetermined) */
180 uint32_t srcadr; /* source address */
181 uint16_t srcport; /* source port */
182 uint8_t stratum; /* stratum of peer */
183 int8_t hpoll; /* host polling interval */
184 int8_t ppoll; /* peer polling interval */
185 uint8_t reach; /* reachability register */
186 uint8_t flags; /* flags, from above */
187 uint8_t hmode; /* peer mode */
188 int32_t delay; /* peer.estdelay; s_fp */
189 int32_t offset_int; /* peer.estoffset; integral part */
190 int32_t offset_frc; /* peer.estoffset; fractional part */
191 uint32_t dispersion; /* peer.estdisp; u_fp */
192 uint32_t v6_flag; /* is this v6 or not */
193 uint32_t unused1; /* (unused) padding for dstadr6 */
194 struct in6_addr dstadr6; /* local address (v6) */
195 struct in6_addr srcadr6; /* source address (v6) */
198 #define REQ_SYS_INFO 4
200 uint32_t peer; /* system peer address (v4) */
201 uint8_t peer_mode; /* mode we are syncing to peer in */
202 uint8_t leap; /* system leap bits */
203 uint8_t stratum; /* our stratum */
204 int8_t precision; /* local clock precision */
205 int32_t rootdelay; /* distance from sync source */
206 uint32_t rootdispersion; /* dispersion from sync source */
207 uint32_t refid; /* reference ID of sync source */
208 uint64_t reftime; /* system reference time */
209 uint32_t poll; /* system poll interval */
210 uint8_t flags; /* system flags */
211 uint8_t unused1; /* unused */
212 uint8_t unused2; /* unused */
213 uint8_t unused3; /* unused */
214 int32_t bdelay; /* default broadcast offset */
215 int32_t frequency; /* frequency residual (scaled ppm) */
216 uint64_t authdelay; /* default authentication delay */
217 uint32_t stability; /* clock stability (scaled ppm) */
218 int32_t v6_flag; /* is this v6 or not */
219 int32_t unused4; /* unused, padding for peer6 */
220 struct in6_addr peer6; /* system peer address (v6) */
223 #define REQ_GET_KERNEL 38
244 /* List of reference clock names */
245 static const char *refclock_names[] = {
246 "UNKNOWN", "LOCAL", "GPS_TRAK", "WWV_PST", /* 0- 3 */
247 "SPECTRACOM", "TRUETIME", "IRIG_AUDIO", "CHU_AUDIO", /* 4- 7 */
248 "GENERIC", "GPS_MX4200", "GPS_AS2201", "GPS_ARBITER", /* 8-11 */
249 "IRIG_TPRO", "ATOM_LEITCH", "MSF_EES", "GPSTM_TRUE", /* 12-15 */
250 "GPS_BANC", "GPS_DATUM", "ACTS_NIST", "WWV_HEATH", /* 16-19 */
251 "GPS_NMEA", "GPS_VME", "PPS", "ACTS_PTB", /* 20-23 */
252 "ACTS_USNO", "TRUETIME", "GPS_HP", "MSF_ARCRON", /* 24-27 */
253 "SHM", "GPS_PALISADE", "GPS_ONCORE", "GPS_JUPITER", /* 28-31 */
254 "CHRONOLOG", "DUMBCLOCK", "ULINK_M320", "PCF", /* 32-35 */
255 "WWV_AUDIO", "GPS_FG", "HOPF_S", "HOPF_P", /* 36-39 */
256 "JJY", "TT_IRIG", "GPS_ZYFER", "GPS_RIPENCC", /* 40-43 */
259 static size_t refclock_names_num = STATIC_ARRAY_SIZE(refclock_names);
260 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
261 * End of the copied stuff.. *
262 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
264 static int ntpd_config(const char *key, const char *value) {
265 if (strcasecmp(key, "Host") == 0) {
266 if (ntpd_host != NULL)
268 if ((ntpd_host = strdup(value)) == NULL)
270 } else if (strcasecmp(key, "Port") == 0) {
271 int port = (int)(atof(value));
272 if ((port > 0) && (port <= 65535))
273 ssnprintf(ntpd_port, sizeof(ntpd_port), "%i", port);
275 sstrncpy(ntpd_port, value, sizeof(ntpd_port));
276 } else if (strcasecmp(key, "ReverseLookups") == 0) {
278 do_reverse_lookups = 1;
280 do_reverse_lookups = 0;
281 } else if (strcasecmp(key, "IncludeUnitID") == 0) {
293 static void ntpd_submit(const char *type, const char *type_inst,
295 value_list_t vl = VALUE_LIST_INIT;
297 vl.values = &(value_t){.gauge = value};
299 sstrncpy(vl.plugin, "ntpd", sizeof(vl.plugin));
300 sstrncpy(vl.type, type, sizeof(vl.type));
301 sstrncpy(vl.type_instance, type_inst, sizeof(vl.type_instance));
303 plugin_dispatch_values(&vl);
306 /* Each time a peer is polled, ntpd shifts the reach register to the left and
307 * sets the LSB based on whether the peer was reachable. If the LSB is zero,
308 * the values are out of date. */
309 static void ntpd_submit_reach(const char *type, const char *type_inst,
310 uint8_t reach, gauge_t value) {
314 ntpd_submit(type, type_inst, value);
317 static int ntpd_connect(void) {
321 struct addrinfo *ai_list;
327 DEBUG("Opening a new socket");
331 host = NTPD_DEFAULT_HOST;
334 if (strlen(port) == 0)
335 port = NTPD_DEFAULT_PORT;
337 struct addrinfo ai_hints = {.ai_family = AF_UNSPEC,
338 .ai_flags = AI_ADDRCONFIG,
339 .ai_protocol = IPPROTO_UDP,
340 .ai_socktype = SOCK_DGRAM};
342 if ((status = getaddrinfo(host, port, &ai_hints, &ai_list)) != 0) {
344 ERROR("ntpd plugin: getaddrinfo (%s, %s): %s", host, port,
345 (status == EAI_SYSTEM) ? sstrerror(errno, errbuf, sizeof(errbuf))
346 : gai_strerror(status));
350 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
351 ai_ptr = ai_ptr->ai_next) {
352 /* create our socket descriptor */
353 if ((sock_descr = socket(ai_ptr->ai_family, ai_ptr->ai_socktype,
354 ai_ptr->ai_protocol)) < 0)
357 /* connect to the ntpd */
358 if (connect(sock_descr, ai_ptr->ai_addr, ai_ptr->ai_addrlen)) {
367 freeaddrinfo(ai_list);
369 if (sock_descr < 0) {
370 ERROR("ntpd plugin: Unable to connect to server.");
376 /* For a description of the arguments see `ntpd_do_query' below. */
377 static int ntpd_receive_response(int *res_items, int *res_size, char **res_data,
380 struct pollfd poll_s;
388 struct timeval time_end;
389 struct timeval time_now;
392 int pkt_item_num; /* items in this packet */
393 int pkt_item_len; /* size of the items in this packet */
395 char pkt_recvd[MAXSEQ + 1] = {
396 0}; /* sequence numbers that have been received */
397 int pkt_recvd_num; /* number of packets that have been received */
398 int pkt_lastseq; /* the last sequence number */
399 ssize_t pkt_padding; /* Padding in this packet */
401 if ((sd = ntpd_connect()) < 0)
414 if (gettimeofday(&time_end, NULL) < 0) {
416 ERROR("ntpd plugin: gettimeofday failed: %s",
417 sstrerror(errno, errbuf, sizeof(errbuf)));
420 time_end.tv_sec++; /* wait for a most one second */
424 struct timeval time_left;
426 if (gettimeofday(&time_now, NULL) < 0) {
428 ERROR("ntpd plugin: gettimeofday failed: %s",
429 sstrerror(errno, errbuf, sizeof(errbuf)));
433 if (timeval_cmp(time_end, time_now, &time_left) <= 0)
436 timeout = 1000 * time_left.tv_sec + ((time_left.tv_usec + 500) / 1000);
438 /* timeout reached */
443 poll_s.events = POLLIN | POLLPRI;
446 DEBUG("Polling for %ims", timeout);
447 status = poll(&poll_s, 1, timeout);
449 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
454 ERROR("ntpd plugin: poll failed: %s",
455 sstrerror(errno, errbuf, sizeof(errbuf)));
459 if (status == 0) /* timeout */
461 DEBUG("timeout reached.");
465 memset(&res, '\0', sizeof(res));
466 status = recv(sd, (void *)&res, sizeof(res), 0 /* no flags */);
468 if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
473 INFO("recv(2) failed: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
474 DEBUG("Closing socket #%i", sd);
476 sock_descr = sd = -1;
480 DEBUG("recv'd %i bytes", status);
483 * Do some sanity checks first
485 if (status < RESP_HEADER_SIZE) {
486 WARNING("ntpd plugin: Short (%i bytes) packet received", (int)status);
489 if (INFO_MODE(res.rm_vn_mode) != MODE_PRIVATE) {
490 NOTICE("ntpd plugin: Packet received with mode %i",
491 INFO_MODE(res.rm_vn_mode));
494 if (INFO_IS_AUTH(res.auth_seq)) {
495 NOTICE("ntpd plugin: Encrypted packet received");
498 if (!ISRESPONSE(res.rm_vn_mode)) {
499 NOTICE("ntpd plugin: Received request packet, "
503 if (INFO_MBZ(res.mbz_itemsize)) {
504 WARNING("ntpd plugin: Received packet with nonzero "
508 if (res.implementation != IMPL_XNTPD) {
509 WARNING("ntpd plugin: Asked for request of type %i, "
511 (int)IMPL_XNTPD, (int)res.implementation);
515 /* Check for error code */
516 if (INFO_ERR(res.err_nitems) != 0) {
517 ERROR("ntpd plugin: Received error code %i",
518 (int)INFO_ERR(res.err_nitems));
519 return ((int)INFO_ERR(res.err_nitems));
522 /* extract number of items in this packet and the size of these items */
523 pkt_item_num = INFO_NITEMS(res.err_nitems);
524 pkt_item_len = INFO_ITEMSIZE(res.mbz_itemsize);
525 DEBUG("pkt_item_num = %i; pkt_item_len = %i;", pkt_item_num, pkt_item_len);
527 /* Check if the reported items fit in the packet */
528 if ((pkt_item_num * pkt_item_len) > (status - RESP_HEADER_SIZE)) {
529 ERROR("ntpd plugin: %i items * %i bytes > "
530 "%i bytes - %i bytes header",
531 (int)pkt_item_num, (int)pkt_item_len, (int)status,
532 (int)RESP_HEADER_SIZE);
536 if (pkt_item_len > res_item_size) {
537 ERROR("ntpd plugin: (pkt_item_len = %i) "
538 ">= (res_item_size = %i)",
539 pkt_item_len, res_item_size);
543 /* If this is the first packet (time wise, not sequence wise),
544 * set `res_size'. If it's not the first packet check if the
545 * items have the same size. Discard invalid packets. */
546 if (items_num == 0) /* first packet */
548 DEBUG("*res_size = %i", pkt_item_len);
549 *res_size = pkt_item_len;
550 } else if (*res_size != pkt_item_len) {
551 DEBUG("Error: *res_size = %i; pkt_item_len = %i;", *res_size,
553 ERROR("Item sizes differ.");
558 * Because the items in the packet may be smaller than the
559 * items requested, the following holds true:
561 assert((*res_size == pkt_item_len) && (pkt_item_len <= res_item_size));
563 /* Calculate the padding. No idea why there might be any padding.. */
565 if (pkt_item_len < res_item_size)
566 pkt_padding = res_item_size - pkt_item_len;
567 DEBUG("res_item_size = %i; pkt_padding = %zi;", res_item_size, pkt_padding);
569 /* Extract the sequence number */
570 pkt_sequence = INFO_SEQ(res.auth_seq);
571 if ((pkt_sequence < 0) || (pkt_sequence > MAXSEQ)) {
572 ERROR("ntpd plugin: Received packet with sequence %i", pkt_sequence);
576 /* Check if this sequence has been received before. If so, discard it. */
577 if (pkt_recvd[pkt_sequence] != '\0') {
578 NOTICE("ntpd plugin: Sequence %i received twice", pkt_sequence);
582 /* If `pkt_lastseq != -1' another packet without `more bit' has
584 if (!ISMORE(res.rm_vn_mode)) {
585 if (pkt_lastseq != -1) {
586 ERROR("ntpd plugin: Two packets which both "
587 "claim to be the last one in the "
588 "sequence have been received.");
591 pkt_lastseq = pkt_sequence;
592 DEBUG("Last sequence = %i;", pkt_lastseq);
596 * Enough with the checks. Copy the data now.
597 * We start by allocating some more memory.
599 DEBUG("realloc (%p, %zu)", (void *)*res_data,
600 (items_num + pkt_item_num) * res_item_size);
601 items = realloc(*res_data, (items_num + pkt_item_num) * res_item_size);
603 ERROR("ntpd plugin: realloc failed.");
606 items_num += pkt_item_num;
609 for (int i = 0; i < pkt_item_num; i++) {
610 /* dst: There are already `*res_items' items with
611 * res_item_size bytes each in in `*res_data'. Set
612 * dst to the first byte after that. */
613 void *dst = (void *)(*res_data + ((*res_items) * res_item_size));
614 /* src: We use `pkt_item_len' to calculate the offset
615 * from the beginning of the packet, because the
616 * items in the packet may be smaller than the
617 * items that were requested. We skip `i' such
619 void *src = (void *)(((char *)res.data) + (i * pkt_item_len));
621 /* Set the padding to zeros */
622 if (pkt_padding != 0)
623 memset(dst, '\0', res_item_size);
624 memcpy(dst, src, (size_t)pkt_item_len);
626 /* Increment `*res_items' by one, so `dst' will end up
627 * one further in the next round. */
629 } /* for (pkt_item_num) */
631 pkt_recvd[pkt_sequence] = (char)1;
634 if ((pkt_recvd_num - 1) == pkt_lastseq)
636 } /* while (done == 0) */
639 } /* int ntpd_receive_response */
641 /* For a description of the arguments see `ntpd_do_query' below. */
642 static int ntpd_send_request(int req_code, int req_items, int req_size,
645 struct req_pkt req = {0};
649 assert(req_items >= 0);
650 assert(req_size >= 0);
652 if ((sd = ntpd_connect()) < 0)
655 req.rm_vn_mode = RM_VN_MODE(0, 0, 0);
656 req.auth_seq = AUTH_SEQ(0, 0);
657 req.implementation = IMPL_XNTPD;
658 req.request = (unsigned char)req_code;
660 req_data_len = (size_t)(req_items * req_size);
662 assert(((req_data != NULL) && (req_data_len > 0)) ||
663 ((req_data == NULL) && (req_items == 0) && (req_size == 0)));
665 req.err_nitems = ERR_NITEMS(0, req_items);
666 req.mbz_itemsize = MBZ_ITEMSIZE(req_size);
668 if (req_data != NULL)
669 memcpy((void *)req.data, (const void *)req_data, req_data_len);
671 DEBUG("req_items = %i; req_size = %i; req_data = %p;", req_items, req_size,
674 status = swrite(sd, (const char *)&req, REQ_LEN_NOMAC);
676 DEBUG("`swrite' failed. Closing socket #%i", sd);
678 sock_descr = sd = -1;
688 * req_code: Type of request packet
689 * req_items: Numver of items in the request
690 * req_size: Size of one item in the request
691 * req_data: Data of the request packet
692 * res_items: Pointer to where the number returned items will be stored.
693 * res_size: Pointer to where the size of one returned item will be stored.
694 * res_data: This is where a pointer to the (allocated) data will be
696 * res_item_size: Size of one returned item. (used to calculate padding)
698 * returns: zero upon success, non-zero otherwise.
700 static int ntpd_do_query(int req_code, int req_items, int req_size,
701 char *req_data, int *res_items, int *res_size,
702 char **res_data, int res_item_size) {
705 status = ntpd_send_request(req_code, req_items, req_size, req_data);
709 status = ntpd_receive_response(res_items, res_size, res_data, res_item_size);
713 static double ntpd_read_fp(int32_t val_int) {
716 val_int = ntohl(val_int);
717 val_double = ((double)val_int) / FP_FRAC;
723 ntpd_get_refclock_id(struct info_peer_summary const *peer_info) {
724 uint32_t addr = ntohl(peer_info->srcadr);
725 uint32_t refclock_id = (addr >> 8) & 0x00FF;
727 return (refclock_id);
730 static int ntpd_get_name_from_address(char *buffer, size_t buffer_size,
731 struct info_peer_summary const *peer_info,
732 _Bool do_reverse_lookup) {
733 struct sockaddr_storage sa = {0};
738 if (peer_info->v6_flag) {
739 struct sockaddr_in6 sa6 = {0};
741 assert(sizeof(sa) >= sizeof(sa6));
743 sa6.sin6_family = AF_INET6;
744 sa6.sin6_port = htons(123);
745 memcpy(&sa6.sin6_addr, &peer_info->srcadr6, sizeof(struct in6_addr));
746 sa_len = sizeof(sa6);
748 memcpy(&sa, &sa6, sizeof(sa6));
750 struct sockaddr_in sa4 = {0};
752 assert(sizeof(sa) >= sizeof(sa4));
754 sa4.sin_family = AF_INET;
755 sa4.sin_port = htons(123);
756 memcpy(&sa4.sin_addr, &peer_info->srcadr, sizeof(struct in_addr));
757 sa_len = sizeof(sa4);
759 memcpy(&sa, &sa4, sizeof(sa4));
762 if (!do_reverse_lookup)
763 flags |= NI_NUMERICHOST;
765 status = getnameinfo((struct sockaddr const *)&sa, sa_len, buffer,
766 buffer_size, NULL, 0, /* No port name */
770 ERROR("ntpd plugin: getnameinfo failed: %s",
771 (status == EAI_SYSTEM) ? sstrerror(errno, errbuf, sizeof(errbuf))
772 : gai_strerror(status));
777 } /* ntpd_get_name_from_address */
779 static int ntpd_get_name_refclock(char *buffer, size_t buffer_size,
780 struct info_peer_summary const *peer_info) {
781 uint32_t refclock_id = ntpd_get_refclock_id(peer_info);
782 uint32_t unit_id = ntohl(peer_info->srcadr) & 0x00FF;
784 if (((size_t)refclock_id) >= refclock_names_num)
785 return (ntpd_get_name_from_address(buffer, buffer_size, peer_info,
786 /* do_reverse_lookup = */ 0));
789 ssnprintf(buffer, buffer_size, "%s-%" PRIu32, refclock_names[refclock_id],
792 sstrncpy(buffer, refclock_names[refclock_id], buffer_size);
795 } /* int ntpd_get_name_refclock */
797 static int ntpd_get_name(char *buffer, size_t buffer_size,
798 struct info_peer_summary const *peer_info) {
799 uint32_t addr = ntohl(peer_info->srcadr);
801 if (!peer_info->v6_flag && ((addr & REFCLOCK_MASK) == REFCLOCK_ADDR))
802 return (ntpd_get_name_refclock(buffer, buffer_size, peer_info));
804 return (ntpd_get_name_from_address(buffer, buffer_size, peer_info,
805 do_reverse_lookups));
806 } /* int ntpd_addr_to_name */
808 static int ntpd_read(void) {
809 struct info_kernel *ik;
813 struct info_peer_summary *ps;
819 gauge_t offset_error;
823 /* On Linux, if the STA_NANO bit is set in ik->status, then ik->offset
824 * is is nanoseconds, otherwise it's microseconds. */
825 double scale_loop = 1e-6;
826 double scale_error = 1e-6;
832 status = ntpd_do_query(REQ_GET_KERNEL, 0, 0, NULL, /* request data */
834 (char **)((void *)&ik), /* response data */
835 sizeof(struct info_kernel));
837 ERROR("ntpd plugin: ntpd_do_query (REQ_GET_KERNEL) failed with status %i",
840 } else if ((ik == NULL) || (ik_num == 0) || (ik_size == 0)) {
841 ERROR("ntpd plugin: ntpd_do_query returned unexpected data. "
842 "(ik = %p; ik_num = %i; ik_size = %i)",
843 (void *)ik, ik_num, ik_size);
847 if (ntohs(ik->status) & STA_NANO) {
852 /* kerninfo -> estimated error */
853 offset_loop = scale_loop * ((gauge_t)ntohl(ik->offset));
854 freq_loop = ntpd_read_fp(ik->freq);
855 offset_error = scale_error * ((gauge_t)ntohl(ik->esterror));
857 DEBUG("info_kernel:\n"
858 " pll offset = %.8g\n"
859 " pll frequency = %.8g\n" /* drift compensation */
860 " est error = %.8g\n",
861 offset_loop, freq_loop, offset_error);
863 ntpd_submit("frequency_offset", "loop", freq_loop);
864 ntpd_submit("time_offset", "loop", offset_loop);
865 ntpd_submit("time_offset", "error", offset_error);
870 status = ntpd_do_query(REQ_PEER_LIST_SUM, 0, 0, NULL, /* request data */
872 (char **)((void *)&ps), /* response data */
873 sizeof(struct info_peer_summary));
876 "ntpd plugin: ntpd_do_query (REQ_PEER_LIST_SUM) failed with status %i",
879 } else if ((ps == NULL) || (ps_num == 0) || (ps_size == 0)) {
880 ERROR("ntpd plugin: ntpd_do_query returned unexpected data. "
881 "(ps = %p; ps_num = %i; ps_size = %i)",
882 (void *)ps, ps_num, ps_size);
886 for (int i = 0; i < ps_num; i++) {
887 struct info_peer_summary *ptr;
890 char peername[NI_MAXHOST];
891 uint32_t refclock_id;
895 status = ntpd_get_name(peername, sizeof(peername), ptr);
897 ERROR("ntpd plugin: Determining name of peer failed.");
901 refclock_id = ntpd_get_refclock_id(ptr);
903 /* Convert the `long floating point' offset value to double */
904 M_LFPTOD(ntohl(ptr->offset_int), ntohl(ptr->offset_frc), offset);
914 " dispersion = %f\n",
915 i, peername, ntohl(ptr->srcadr), ptr->reach, ntpd_read_fp(ptr->delay),
916 ntohl(ptr->offset_int), ntohl(ptr->offset_frc), offset,
917 ntpd_read_fp(ptr->dispersion));
920 1) /* not the system clock (offset will always be zero.. */
921 ntpd_submit_reach("time_offset", peername, ptr->reach, offset);
922 ntpd_submit_reach("time_dispersion", peername, ptr->reach,
923 ntpd_read_fp(ptr->dispersion));
924 if (refclock_id == 0) /* not a reference clock */
925 ntpd_submit_reach("delay", peername, ptr->reach,
926 ntpd_read_fp(ptr->delay));
933 } /* int ntpd_read */
935 void module_register(void) {
936 plugin_register_config("ntpd", ntpd_config, config_keys, config_keys_num);
937 plugin_register_read("ntpd", ntpd_read);
938 } /* void module_register */