2 * NTP client/server, based on OpenNTPD 3.9p1
4 * Author: Adam Tkac <vonsch@gmail.com>
6 * Licensed under GPLv2, see file LICENSE in this tarball for details.
10 #include <netinet/ip.h> /* For IPTOS_LOWDELAY definition */
13 # error "Sorry, your kernel has to support IP_PKTINFO"
16 #define INTERVAL_QUERY_NORMAL 30 /* sync to peers every n secs */
17 #define INTERVAL_QUERY_PATHETIC 60
18 #define INTERVAL_QUERY_AGRESSIVE 5
20 #define TRUSTLEVEL_BADPEER 6
21 #define TRUSTLEVEL_PATHETIC 2
22 #define TRUSTLEVEL_AGRESSIVE 8
23 #define TRUSTLEVEL_MAX 10
25 #define QSCALE_OFF_MIN 0.05
26 #define QSCALE_OFF_MAX 0.50
28 #define QUERYTIME_MAX 15 /* single query might take n secs max */
29 #define OFFSET_ARRAY_SIZE 8
30 #define SETTIME_MIN_OFFSET 180 /* min offset for settime at start */
31 #define SETTIME_TIMEOUT 15 /* max seconds to wait with -s */
33 /* Style borrowed from NTP ref/tcpdump and updated for SNTPv4 (RFC2030). */
39 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
49 * | Integer Part | Fraction Part |
50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
62 #define NTP_DIGESTSIZE 16
63 #define NTP_MSGSIZE_NOAUTH 48
64 #define NTP_MSGSIZE (NTP_MSGSIZE_NOAUTH + 4 + NTP_DIGESTSIZE)
67 uint8_t status; /* status of local clock and leap info */
68 uint8_t stratum; /* Stratum level */
69 uint8_t ppoll; /* poll value */
71 s_fixedpt_t rootdelay;
72 s_fixedpt_t dispersion;
79 uint8_t digest[NTP_DIGESTSIZE];
91 /* Leap Second Codes (high order two bits) */
92 LI_NOWARNING = (0 << 6), /* no warning */
93 LI_PLUSSEC = (1 << 6), /* add a second (61 seconds) */
94 LI_MINUSSEC = (2 << 6), /* minus a second (59 seconds) */
95 LI_ALARM = (3 << 6), /* alarm condition */
99 VERSION_MASK = (7 << 3),
103 MODE_RES0 = 0, /* reserved */
104 MODE_SYM_ACT = 1, /* symmetric active */
105 MODE_SYM_PAS = 2, /* symmetric passive */
106 MODE_CLIENT = 3, /* client */
107 MODE_SERVER = 4, /* server */
108 MODE_BROADCAST = 5, /* broadcast */
109 MODE_RES1 = 6, /* reserved for NTP control message */
110 MODE_RES2 = 7 /* reserved for private use */
113 #define JAN_1970 2208988800UL /* 1970 - 1900 in seconds */
123 double rootdispersion;
144 len_and_sockaddr *lsa;
146 ntp_offset_t reply[OFFSET_ARRAY_SIZE];
148 enum client_state state;
159 /* Insert new options above this line. */
160 /* Non-compat options: */
168 #if ENABLE_FEATURE_NTPD_SERVER
178 #define G (*ptr_to_globals)
181 static const int const_IPTOS_LOWDELAY = IPTOS_LOWDELAY;
185 set_next(ntp_peer_t *p, time_t t)
187 p->next = time(NULL) + t;
192 add_peers(const char *s)
196 p = xzalloc(sizeof(*p));
197 //TODO: big ntpd uses all IPs, not just 1st, do we need to mimic that?
198 p->lsa = xhost2sockaddr(s, 123);
200 p->query.msg.status = MODE_CLIENT | (NTP_VERSION << 3);
202 p->state = STATE_NONE;
203 p->trustlevel = TRUSTLEVEL_PATHETIC;
207 llist_add_to(&G.ntp_peers, p);
216 gettimeofday(&tv, NULL); /* never fails */
217 return (tv.tv_sec + JAN_1970 + 1.0e-6 * tv.tv_usec);
222 d_to_tv(double d, struct timeval *tv)
224 tv->tv_sec = (long)d;
225 tv->tv_usec = (d - tv->tv_sec) * 1000000;
229 lfp_to_d(l_fixedpt_t lfp)
233 lfp.int_partl = ntohl(lfp.int_partl);
234 lfp.fractionl = ntohl(lfp.fractionl);
235 ret = (double)(lfp.int_partl) + ((double)lfp.fractionl / UINT_MAX);
239 #if ENABLE_FEATURE_NTPD_SERVER
245 lfp.int_partl = htonl((uint32_t)d);
246 lfp.fractionl = htonl((uint32_t)((d - (u_int32_t)d) * UINT_MAX));
252 sfp_to_d(s_fixedpt_t sfp)
256 sfp.int_parts = ntohs(sfp.int_parts);
257 sfp.fractions = ntohs(sfp.fractions);
258 ret = (double)(sfp.int_parts) + ((double)sfp.fractions / USHRT_MAX);
262 #if ENABLE_FEATURE_NTPD_SERVER
268 sfp.int_parts = htons((uint16_t)d);
269 sfp.fractions = htons((uint16_t)((d - (u_int16_t)d) * USHRT_MAX));
275 set_deadline(ntp_peer_t *p, time_t t)
277 p->deadline = time(NULL) + t;
286 interval = INTERVAL_QUERY_PATHETIC * QSCALE_OFF_MAX / QSCALE_OFF_MIN;
287 r = random() % (interval / 10);
288 return (interval + r);
293 const struct sockaddr *from, const struct sockaddr *to, socklen_t addrlen,
294 ntp_msg_t *msg, ssize_t len)
300 ret = sendto(fd, msg, len, 0, to, addrlen);
302 ret = send_to_from(fd, msg, len, 0, to, from, addrlen);
305 bb_perror_msg("send failed");
312 client_query(ntp_peer_t *p)
314 if (p->query.fd == -1) {
315 p->query.fd = xsocket(p->lsa->u.sa.sa_family, SOCK_DGRAM, 0);
316 #if ENABLE_FEATURE_IPV6
317 if (p->lsa->u.sa.sa_family == AF_INET)
319 setsockopt(p->query.fd, IPPROTO_IP, IP_TOS, &const_IPTOS_LOWDELAY, sizeof(const_IPTOS_LOWDELAY));
323 * Send out a random 64-bit number as our transmit time. The NTP
324 * server will copy said number into the originate field on the
325 * response that it sends us. This is totally legal per the SNTP spec.
327 * The impact of this is two fold: we no longer send out the current
328 * system time for the world to see (which may aid an attacker), and
329 * it gives us a (not very secure) way of knowing that we're not
330 * getting spoofed by an attacker that can't capture our traffic
331 * but can spoof packets from the NTP server we're communicating with.
333 * Save the real transmit timestamp locally.
336 p->query.msg.xmttime.int_partl = random();
337 p->query.msg.xmttime.fractionl = random();
338 p->query.xmttime = gettime();
340 if (sendmsg_wrap(p->query.fd, /*from:*/ NULL, /*to:*/ &p->lsa->u.sa, /*addrlen:*/ p->lsa->len,
341 &p->query.msg, NTP_MSGSIZE_NOAUTH) == -1) {
342 set_next(p, INTERVAL_QUERY_PATHETIC);
346 p->state = STATE_QUERY_SENT;
347 set_deadline(p, QUERYTIME_MAX);
353 offset_compare(const void *aa, const void *bb)
355 const ntp_peer_t * const *a;
356 const ntp_peer_t * const *b;
361 if ((*a)->update.offset < (*b)->update.offset)
363 return ((*a)->update.offset > (*b)->update.offset);
367 updated_scale(double offset)
372 if (offset > QSCALE_OFF_MAX)
374 if (offset < QSCALE_OFF_MIN)
375 return QSCALE_OFF_MAX / QSCALE_OFF_MIN;
376 return QSCALE_OFF_MAX / offset;
386 double offset_median;
388 len_and_sockaddr *lsa;
389 struct timeval tv, olddelta;
392 for (item = G.ntp_peers; item != NULL; item = item->link) {
393 p = (ntp_peer_t *) item->data;
394 if (p->trustlevel < TRUSTLEVEL_BADPEER)
401 peers = xzalloc(sizeof(ntp_peer_t *) * offset_cnt);
402 for (item = G.ntp_peers; item != NULL; item = item->link) {
403 p = (ntp_peer_t *) item->data;
404 if (p->trustlevel < TRUSTLEVEL_BADPEER)
409 qsort(peers, offset_cnt, sizeof(ntp_peer_t *), offset_compare);
411 if (offset_cnt != 0) {
412 if ((offset_cnt & 1) == 0) {
413 //TODO: try offset_cnt /= 2...
415 (peers[offset_cnt / 2 - 1]->update.offset +
416 peers[offset_cnt / 2]->update.offset) / 2;
418 (peers[offset_cnt / 2 - 1]->update.delay +
419 peers[offset_cnt / 2]->update.delay) / 2;
420 G.status.stratum = MAX(
421 peers[offset_cnt / 2 - 1]->update.status.stratum,
422 peers[offset_cnt / 2]->update.status.stratum);
424 offset_median = peers[offset_cnt / 2]->update.offset;
425 G.status.rootdelay = peers[offset_cnt / 2]->update.delay;
426 G.status.stratum = peers[offset_cnt / 2]->update.status.stratum;
428 G.status.leap = peers[offset_cnt / 2]->update.status.leap;
430 bb_info_msg("adjusting local clock by %fs", offset_median);
432 d_to_tv(offset_median, &tv);
433 if (adjtime(&tv, &olddelta) == -1)
434 bb_error_msg("adjtime failed");
436 && olddelta.tv_sec == 0
437 && olddelta.tv_usec == 0
440 bb_info_msg("clock synced");
442 } else if (G.status.synced) {
443 bb_info_msg("clock unsynced");
448 G.status.reftime = gettime();
449 G.status.stratum++; /* one more than selected peer */
450 G.scale = updated_scale(offset_median);
452 G.status.refid4 = peers[offset_cnt / 2]->update.status.refid4;
454 lsa = peers[offset_cnt / 2]->lsa;
456 #if ENABLE_FEATURE_IPV6
457 lsa->u.sa.sa_family != AF_INET ?
460 lsa->u.sin.sin_addr.s_addr;
465 for (item = G.ntp_peers; item != NULL; item = item->link) {
466 p = (ntp_peer_t *) item->data;
472 settime(double offset)
476 struct timeval tv, curtime;
485 /* if the offset is small, don't call settimeofday */
486 if (offset < SETTIME_MIN_OFFSET && offset > -SETTIME_MIN_OFFSET)
489 gettimeofday(&curtime, NULL); /* never fails */
491 d_to_tv(offset, &tv);
492 curtime.tv_usec += tv.tv_usec + 1000000;
493 curtime.tv_sec += tv.tv_sec - 1 + (curtime.tv_usec / 1000000);
494 curtime.tv_usec %= 1000000;
496 if (settimeofday(&curtime, NULL) == -1) {
497 bb_error_msg("settimeofday");
501 tval = curtime.tv_sec;
502 strftime(buf, sizeof(buf), "%a %b %e %H:%M:%S %Z %Y", localtime(&tval));
504 /* Do we want to print message below to system log when daemonized? */
505 bb_info_msg("set local clock to %s (offset %fs)", buf, offset);
507 for (item = G.ntp_peers; item != NULL; item = item->link) {
508 p = (ntp_peer_t *) item->data;
512 p->deadline -= offset;
516 if (option_mask32 & OPT_q)
521 client_update(ntp_peer_t *p)
523 int i, best = 0, good = 0;
527 * find the offset which arrived with the lowest delay
528 * use that as the peer update
529 * invalidate it and all older ones
532 for (i = 0; good == 0 && i < OFFSET_ARRAY_SIZE; i++) {
533 if (p->reply[i].good) {
539 for (; i < OFFSET_ARRAY_SIZE; i++) {
540 if (p->reply[i].good) {
542 if (p->reply[i].delay < p->reply[best].delay)
550 memcpy(&p->update, &p->reply[best], sizeof(p->update));
553 for (i = 0; i < OFFSET_ARRAY_SIZE; i++)
554 if (p->reply[i].rcvd <= p->reply[best].rcvd)
555 p->reply[i].good = 0;
559 scale_interval(time_t requested)
563 interval = requested * G.scale;
564 r = random() % MAX(5, interval / 10);
565 return (interval + r);
569 client_dispatch(ntp_peer_t *p)
574 double T1, T2, T3, T4;
576 ntp_offset_t *offset;
578 addr = xmalloc_sockaddr2dotted_noport(&p->lsa->u.sa);
580 size = recvfrom(p->query.fd, &msg, sizeof(msg), 0, NULL, NULL);
582 bb_perror_msg("recvfrom(%s) error", addr);
583 if (errno == EHOSTUNREACH || errno == EHOSTDOWN
584 || errno == ENETUNREACH || errno == ENETDOWN
585 || errno == ECONNREFUSED || errno == EADDRNOTAVAIL
587 //TODO: always do this?
588 set_next(p, error_interval());
596 if (size != NTP_MSGSIZE_NOAUTH && size != NTP_MSGSIZE) {
597 bb_error_msg("malformed packet received from %s", addr);
601 if (msg.orgtime.int_partl != p->query.msg.xmttime.int_partl
602 || msg.orgtime.fractionl != p->query.msg.xmttime.fractionl
607 if ((msg.status & LI_ALARM) == LI_ALARM
609 || msg.stratum > NTP_MAXSTRATUM
611 interval = error_interval();
612 bb_info_msg("reply from %s: not synced, next query %ds", addr, (int) interval);
617 * From RFC 2030 (with a correction to the delay math):
619 * Timestamp Name ID When Generated
620 * ------------------------------------------------------------
621 * Originate Timestamp T1 time request sent by client
622 * Receive Timestamp T2 time request received by server
623 * Transmit Timestamp T3 time reply sent by server
624 * Destination Timestamp T4 time reply received by client
626 * The roundtrip delay d and local clock offset t are defined as
628 * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2.
631 T1 = p->query.xmttime;
632 T2 = lfp_to_d(msg.rectime);
633 T3 = lfp_to_d(msg.xmttime);
635 offset = &p->reply[p->shift];
637 offset->offset = ((T2 - T1) + (T3 - T4)) / 2;
638 offset->delay = (T4 - T1) - (T3 - T2);
639 if (offset->delay < 0) {
640 interval = error_interval();
641 set_next(p, interval);
642 bb_info_msg("reply from %s: negative delay %f", addr, p->reply[p->shift].delay);
645 offset->error = (T2 - T1) - (T3 - T4);
646 offset->rcvd = time(NULL);
649 offset->status.leap = (msg.status & LI_MASK);
650 offset->status.precision = msg.precision;
651 offset->status.rootdelay = sfp_to_d(msg.rootdelay);
652 offset->status.rootdispersion = sfp_to_d(msg.dispersion);
653 offset->status.refid = ntohl(msg.refid);
654 offset->status.refid4 = msg.xmttime.fractionl;
655 offset->status.reftime = lfp_to_d(msg.reftime);
656 offset->status.poll = msg.ppoll;
657 offset->status.stratum = msg.stratum;
659 if (p->trustlevel < TRUSTLEVEL_PATHETIC)
660 interval = scale_interval(INTERVAL_QUERY_PATHETIC);
661 else if (p->trustlevel < TRUSTLEVEL_AGRESSIVE)
662 interval = scale_interval(INTERVAL_QUERY_AGRESSIVE);
664 interval = scale_interval(INTERVAL_QUERY_NORMAL);
666 set_next(p, interval);
667 p->state = STATE_REPLY_RECEIVED;
669 /* every received reply which we do not discard increases trust */
670 if (p->trustlevel < TRUSTLEVEL_MAX) {
671 if (p->trustlevel < TRUSTLEVEL_BADPEER
672 && p->trustlevel + 1 >= TRUSTLEVEL_BADPEER
674 bb_info_msg("peer %s now valid", addr);
679 bb_info_msg("reply from %s: offset %f delay %f, next query %ds", addr,
680 offset->offset, offset->delay, (int) interval);
683 settime(offset->offset);
685 if (++p->shift >= OFFSET_ARRAY_SIZE)
692 #if ENABLE_FEATURE_NTPD_SERVER
694 server_dispatch(int fd)
699 len_and_sockaddr *to;
700 struct sockaddr *from;
701 ntp_msg_t query, reply;
703 to = get_sock_lsa(G.listen_fd);
704 from = xzalloc(to->len);
706 size = recv_from_to(fd, &query, sizeof(query), 0, from, &to->u.sa, to->len);
708 bb_error_msg_and_die("recv_from_to");
709 if (size != NTP_MSGSIZE_NOAUTH && size != NTP_MSGSIZE) {
710 char *addr = xmalloc_sockaddr2dotted_noport(from);
711 bb_error_msg("malformed packet received from %s", addr);
717 version = (query.status & VERSION_MASK) >> 3;
719 memset(&reply, 0, sizeof(reply));
720 reply.status = G.status.synced ? G.status.leap : LI_ALARM;
721 reply.status |= (query.status & VERSION_MASK);
722 reply.status |= ((query.status & MODE_MASK) == MODE_CLIENT) ?
723 MODE_SERVER : MODE_SYM_PAS;
724 reply.stratum = G.status.stratum;
725 reply.ppoll = query.ppoll;
726 reply.precision = G.status.precision;
727 reply.rectime = d_to_lfp(rectime);
728 reply.reftime = d_to_lfp(G.status.reftime);
729 reply.xmttime = d_to_lfp(gettime());
730 reply.orgtime = query.xmttime;
731 reply.rootdelay = d_to_sfp(G.status.rootdelay);
732 reply.refid = (version > 3) ? G.status.refid4 : G.status.refid;
734 /* We reply from the address packet was sent to,
735 * this makes to/from look swapped here: */
736 sendmsg_wrap(fd, /*from:*/ &to->u.sa, /*to:*/ from, /*addrlen:*/ to->len,
745 /* Upstream ntpd's options:
747 * -4 Force DNS resolution of host names to the IPv4 namespace.
748 * -6 Force DNS resolution of host names to the IPv6 namespace.
749 * -a Require cryptographic authentication for broadcast client,
750 * multicast client and symmetric passive associations.
751 * This is the default.
752 * -A Do not require cryptographic authentication for broadcast client,
753 * multicast client and symmetric passive associations.
754 * This is almost never a good idea.
755 * -b Enable the client to synchronize to broadcast servers.
757 * Specify the name and path of the configuration file,
758 * default /etc/ntp.conf
759 * -d Specify debugging mode. This option may occur more than once,
760 * with each occurrence indicating greater detail of display.
762 * Specify debugging level directly.
764 * Specify the name and path of the frequency file.
765 * This is the same operation as the "driftfile FILE"
766 * configuration command.
767 * -g Normally, ntpd exits with a message to the system log
768 * if the offset exceeds the panic threshold, which is 1000 s
769 * by default. This option allows the time to be set to any value
770 * without restriction; however, this can happen only once.
771 * If the threshold is exceeded after that, ntpd will exit
772 * with a message to the system log. This option can be used
773 * with the -q and -x options. See the tinker command for other options.
775 * Chroot the server to the directory jaildir. This option also implies
776 * that the server attempts to drop root privileges at startup
777 * (otherwise, chroot gives very little additional security).
778 * You may need to also specify a -u option.
780 * Specify the name and path of the symmetric key file,
781 * default /etc/ntp/keys. This is the same operation
782 * as the "keys FILE" configuration command.
784 * Specify the name and path of the log file. The default
785 * is the system log file. This is the same operation as
786 * the "logfile FILE" configuration command.
787 * -L Do not listen to virtual IPs. The default is to listen.
789 * -N To the extent permitted by the operating system,
790 * run the ntpd at the highest priority.
792 * Specify the name and path of the file used to record the ntpd
793 * process ID. This is the same operation as the "pidfile FILE"
794 * configuration command.
796 * To the extent permitted by the operating system,
797 * run the ntpd at the specified priority.
798 * -q Exit the ntpd just after the first time the clock is set.
799 * This behavior mimics that of the ntpdate program, which is
800 * to be retired. The -g and -x options can be used with this option.
801 * Note: The kernel time discipline is disabled with this option.
803 * Specify the default propagation delay from the broadcast/multicast
804 * server to this client. This is necessary only if the delay
805 * cannot be computed automatically by the protocol.
807 * Specify the directory path for files created by the statistics
808 * facility. This is the same operation as the "statsdir DIR"
809 * configuration command.
811 * Add a key number to the trusted key list. This option can occur
814 * Specify a user, and optionally a group, to switch to.
817 * Add a system variable listed by default.
818 * -x Normally, the time is slewed if the offset is less than the step
819 * threshold, which is 128 ms by default, and stepped if above
820 * the threshold. This option sets the threshold to 600 s, which is
821 * well within the accuracy window to set the clock manually.
822 * Note: since the slew rate of typical Unix kernels is limited
823 * to 0.5 ms/s, each second of adjustment requires an amortization
824 * interval of 2000 s. Thus, an adjustment as much as 600 s
825 * will take almost 14 days to complete. This option can be used
826 * with the -g and -q options. See the tinker command for other options.
827 * Note: The kernel time discipline is disabled with this option.
830 /* By doing init in a separate function we decrease stack usage
833 static NOINLINE void ntp_init(char **argv)
841 bb_error_msg_and_die("need root privileges");
844 opt_complementary = "dd:p::"; /* d: counter, p: list */
845 opts = getopt32(argv,
847 "p:"IF_FEATURE_NTPD_SERVER("l") /* NOT compat */
849 "46aAbLNx", /* compat, ignored */
851 #if ENABLE_FEATURE_NTPD_SERVER
854 G.listen_fd = create_and_bind_dgram_or_die(NULL, 123);
855 socket_want_pktinfo(G.listen_fd);
856 setsockopt(G.listen_fd, IPPROTO_IP, IP_TOS, &const_IPTOS_LOWDELAY, sizeof(const_IPTOS_LOWDELAY));
862 add_peers(llist_pop(&peers));
863 if (!(opts & OPT_n)) {
864 logmode = LOGMODE_NONE;
865 bb_daemonize(DAEMON_DEVNULL_STDIO);
868 /* Set some globals */
874 /* We can use sys_clock_getres but assuming 10ms tick should be fine */
875 clock_getres(CLOCK_REALTIME, &tp);
877 tp.tv_nsec = 10000000;
878 b = 1000000000 / tp.tv_nsec; /* convert to Hz */
880 b = 100; /* b = 1000000000/10000000 = 100 */
884 G.status.precision = prec;
889 bb_signals((1 << SIGTERM) | (1 << SIGINT), record_signo);
890 bb_signals((1 << SIGPIPE) | (1 << SIGHUP), SIG_IGN);
893 int ntpd_main(int argc UNUSED_PARAM, char **argv) MAIN_EXTERNALLY_VISIBLE;
894 int ntpd_main(int argc UNUSED_PARAM, char **argv)
898 ntp_peer_t **idx2peer;
900 memset(&g, 0, sizeof(g));
901 SET_PTR_TO_GLOBALS(&g);
906 unsigned new_cnt = g.peer_cnt;
907 idx2peer = xzalloc(sizeof(void *) * new_cnt);
908 /* if ENABLE_FEATURE_NTPD_SERVER, + 1 for listen_fd: */
909 pfd = xzalloc(sizeof(pfd[0]) * (new_cnt + ENABLE_FEATURE_NTPD_SERVER));
912 while (!bb_got_signal) {
914 unsigned i, j, idx_peers;
915 unsigned sent_cnt, trial_cnt;
919 nextaction = time(NULL) + 3600;
922 #if ENABLE_FEATURE_NTPD_SERVER
923 if (g.listen_fd != -1) {
924 pfd[0].fd = g.listen_fd;
925 pfd[0].events = POLLIN;
930 sent_cnt = trial_cnt = 0;
931 for (item = g.ntp_peers; item != NULL; item = item->link) {
932 ntp_peer_t *p = (ntp_peer_t *) item->data;
934 if (p->next > 0 && p->next <= time(NULL)) {
936 if (client_query(p) == 0)
939 if (p->next > 0 && p->next < nextaction)
940 nextaction = p->next;
941 if (p->deadline > 0 && p->deadline < nextaction)
942 nextaction = p->deadline;
944 if (p->deadline > 0 && p->deadline <= time(NULL)) {
945 char *addr = xmalloc_sockaddr2dotted_noport(&p->lsa->u.sa);
947 timeout = error_interval();
948 bb_info_msg("no reply from %s received in time, "
949 "next query %ds", addr, timeout);
950 if (p->trustlevel >= TRUSTLEVEL_BADPEER) {
952 if (p->trustlevel < TRUSTLEVEL_BADPEER)
953 bb_info_msg("peer %s now invalid", addr);
957 set_next(p, timeout);
960 if (p->state == STATE_QUERY_SENT) {
961 pfd[i].fd = p->query.fd;
962 pfd[i].events = POLLIN;
963 idx2peer[i - idx_peers] = p;
968 if ((trial_cnt > 0 && sent_cnt == 0) || g.peer_cnt == 0)
969 settime(0); /* no good peers, don't wait */
971 timeout = nextaction - time(NULL);
976 bb_error_msg("entering poll %u secs", timeout);
977 nfds = poll(pfd, i, timeout * 1000);
980 #if ENABLE_FEATURE_NTPD_SERVER
981 for (; nfds > 0 && j < idx_peers; j++) {
982 if (pfd[j].revents & (POLLIN|POLLERR)) {
984 server_dispatch(pfd[j].fd);
988 for (; nfds > 0 && j < i; j++) {
989 if (pfd[j].revents & (POLLIN|POLLERR)) {
991 client_dispatch(idx2peer[j - idx_peers]);
994 } /* while (!bb_got_signal) */
996 kill_myself_with_sig(bb_got_signal);