/***
This file is part of systemd.
- Copyright 2014 Kay Sievers
+ Copyright 2014 Kay Sievers, Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
#include <sys/timerfd.h>
#include <sys/timex.h>
#include <sys/socket.h>
+#include <resolv.h>
+#include <sys/prctl.h>
+#include <sys/types.h>
+#include <grp.h>
#include "missing.h"
#include "util.h"
#include "sparse-endian.h"
#include "log.h"
+#include "socket-util.h"
+#include "list.h"
+#include "ratelimit.h"
+#include "strv.h"
+#include "conf-parser.h"
#include "sd-event.h"
+#include "sd-resolve.h"
#include "sd-daemon.h"
+#include "sd-network.h"
+#include "event-util.h"
+#include "network-util.h"
+#include "clock-util.h"
+#include "capability.h"
+#include "mkdir.h"
+#include "timesyncd.h"
#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
*/
#define OFFSET_1900_1970 2208988800UL
+#define RETRY_USEC (30*USEC_PER_SEC)
+#define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC)
+#define RATELIMIT_BURST 10
+
+#define TIMEOUT_USEC (10*USEC_PER_SEC)
+
struct ntp_ts {
be32_t sec;
be32_t frac;
struct ntp_ts trans_time;
} _packed_;
-typedef struct Manager Manager;
-struct Manager {
- sd_event *event;
-
- /* peer */
- sd_event_source *event_receive;
- char *server;
- struct sockaddr_in server_addr;
- int server_socket;
- uint64_t packet_count;
-
- /* last sent packet */
- struct timespec trans_time_mon;
- struct timespec trans_time;
- usec_t retry_interval;
- bool pending;
-
- /* poll timer */
- sd_event_source *event_timer;
- usec_t poll_interval_usec;
- bool poll_resync;
-
- /* history data */
- struct {
- double offset;
- double delay;
- } samples[8];
- unsigned int samples_idx;
- double samples_jitter;
-
- /* last change */
- bool jumped;
-
- /* watch for time changes */
- sd_event_source *event_clock_watch;
- int clock_watch_fd;
-};
-
static void manager_free(Manager *m);
DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
#define _cleanup_manager_free_ _cleanup_(manager_freep)
-static int sntp_arm_timer(Manager *m, usec_t next);
-static int sntp_clock_watch_setup(Manager *m);
-static void sntp_server_disconnect(Manager *m);
+static int manager_arm_timer(Manager *m, usec_t next);
+static int manager_clock_watch_setup(Manager *m);
+static int manager_connect(Manager *m);
+static void manager_disconnect(Manager *m);
static double ntp_ts_to_d(const struct ntp_ts *ts) {
return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX);
}
+static double ts_to_d(const struct timespec *ts) {
+ return ts->tv_sec + (1.0e-9 * ts->tv_nsec);
+}
+
static double tv_to_d(const struct timeval *tv) {
return tv->tv_sec + (1.0e-6 * tv->tv_usec);
}
-static double ts_to_d(const struct timespec *ts) {
- return ts->tv_sec + (1.0e-9 * ts->tv_nsec);
+static double square(double d) {
+ return d * d;
}
-static void d_to_tv(double d, struct timeval *tv) {
- tv->tv_sec = (long)d;
- tv->tv_usec = (d - tv->tv_sec) * 1000 * 1000;
+static int load_clock_timestamp(uid_t uid, gid_t gid) {
+ _cleanup_close_ int fd = -1;
+ usec_t min = TIME_EPOCH * USEC_PER_SEC;
+ usec_t ct;
+ int r;
+
+ /* Let's try to make sure that the clock is always
+ * monotonically increasing, by saving the clock whenever we
+ * have a new NTP time, or when we shut down, and restoring it
+ * when we start again. This is particularly helpful on
+ * systems lacking a battery backed RTC. We also will adjust
+ * the time to at least the build time of systemd. */
+
+ fd = open("/var/lib/systemd/clock", O_RDWR|O_CLOEXEC, 0644);
+ if (fd >= 0) {
+ struct stat st;
+ usec_t stamp;
+
+ /* check if the recorded time is later than the compiled-in one */
+ r = fstat(fd, &st);
+ if (r >= 0) {
+ stamp = timespec_load(&st.st_mtim);
+ if (stamp > min)
+ min = stamp;
+ }
+
+ /* Try to fix the access mode, so that we can still
+ touch the file after dropping priviliges */
+ fchmod(fd, 0644);
+ fchown(fd, uid, gid);
+
+ } else
+ /* create stamp file with the compiled-in date */
+ touch_file("/var/lib/systemd/clock", true, min, uid, gid, 0644);
+
+ ct = now(CLOCK_REALTIME);
+ if (ct < min) {
+ struct timespec ts;
+ char date[FORMAT_TIMESTAMP_MAX];
+
+ log_info("System clock time unset or jumped backwards, restoring from recorded timestamp: %s",
+ format_timestamp(date, sizeof(date), min));
- /* the kernel expects -0.3s as {-1, 7000.000} */
- if (tv->tv_usec < 0) {
- tv->tv_sec -= 1;
- tv->tv_usec += 1000 * 1000;
+ if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, min)) < 0)
+ log_error("Failed to restore system clock: %m");
}
+
+ return 0;
}
-static double square(double d) {
- return d * d;
+static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) {
+ _cleanup_free_ char *pretty = NULL;
+ Manager *m = userdata;
+
+ assert(m);
+ assert(m->current_server_name);
+ assert(m->current_server_address);
+
+ server_address_pretty(m->current_server_address, &pretty);
+ log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string);
+
+ return manager_connect(m);
}
-static int sntp_send_request(Manager *m) {
- struct ntp_msg ntpmsg = {};
- struct sockaddr_in addr = {};
+static int manager_send_request(Manager *m) {
+ _cleanup_free_ char *pretty = NULL;
+ struct ntp_msg ntpmsg = {
+ /*
+ * "The client initializes the NTP message header, sends the request
+ * to the server, and strips the time of day from the Transmit
+ * Timestamp field of the reply. For this purpose, all the NTP
+ * header fields are set to 0, except the Mode, VN, and optional
+ * Transmit Timestamp fields."
+ */
+ .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT),
+ };
ssize_t len;
int r;
- /*
- * "The client initializes the NTP message header, sends the request
- * to the server, and strips the time of day from the Transmit
- * Timestamp field of the reply. For this purpose, all the NTP
- * header fields are set to 0, except the Mode, VN, and optional
- * Transmit Timestamp fields."
- */
- ntpmsg.field = NTP_FIELD(0, 4, NTP_MODE_CLIENT);
+ assert(m);
+ assert(m->current_server_name);
+ assert(m->current_server_address);
+
+ m->event_timeout = sd_event_source_unref(m->event_timeout);
/*
* Set transmit timestamp, remember it; the server will send that back
* The actual value does not matter, We do not care about the correct
* NTP UINT_MAX fraction; we just pass the plain nanosecond value.
*/
- clock_gettime(CLOCK_MONOTONIC, &m->trans_time_mon);
- clock_gettime(CLOCK_REALTIME, &m->trans_time);
+ assert_se(clock_gettime(clock_boottime_or_monotonic(), &m->trans_time_mon) >= 0);
+ assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0);
ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970);
ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec);
- addr.sin_family = AF_INET;
- addr.sin_port = htobe16(123);
- addr.sin_addr.s_addr = inet_addr(m->server);
- len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &addr, sizeof(addr));
+ server_address_pretty(m->current_server_address, &pretty);
+
+ len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen);
if (len == sizeof(ntpmsg)) {
m->pending = true;
- log_debug("Sent NTP request to: %s", m->server);
- } else
- log_debug("Sending NTP request to %s failed: %m", m->server);
+ log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string);
+ } else {
+ log_debug("Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string);
+ return manager_connect(m);
+ }
- /* re-arm timer with incresing timeout, in case the packets never arrive back */
+ /* re-arm timer with increasing timeout, in case the packets never arrive back */
if (m->retry_interval > 0) {
if (m->retry_interval < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC)
m->retry_interval *= 2;
} else
m->retry_interval = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC;
- r = sntp_arm_timer(m, m->retry_interval);
- if (r < 0)
+
+ r = manager_arm_timer(m, m->retry_interval);
+ if (r < 0) {
+ log_error("Failed to rearm timer: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_event_add_time(
+ m->event,
+ &m->event_timeout,
+ clock_boottime_or_monotonic(),
+ now(clock_boottime_or_monotonic()) + TIMEOUT_USEC, 0,
+ manager_timeout, m);
+ if (r < 0) {
+ log_error("Failed to arm timeout timer: %s", strerror(-r));
return r;
+ }
return 0;
}
-static int sntp_timer(sd_event_source *source, usec_t usec, void *userdata) {
+static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) {
Manager *m = userdata;
assert(m);
- sntp_send_request(m);
- return 0;
+ return manager_send_request(m);
}
-static int sntp_arm_timer(Manager *m, usec_t next) {
+static int manager_arm_timer(Manager *m, usec_t next) {
int r;
assert(m);
}
if (m->event_timer) {
- r = sd_event_source_set_time(m->event_timer, now(CLOCK_MONOTONIC) + next);
+ r = sd_event_source_set_time(m->event_timer, now(clock_boottime_or_monotonic()) + next);
if (r < 0)
return r;
return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT);
}
- r = sd_event_add_time(
+ return sd_event_add_time(
m->event,
&m->event_timer,
- CLOCK_MONOTONIC,
- now(CLOCK_MONOTONIC) + next, 0,
- sntp_timer, m);
- if (r < 0)
- return r;
-
- return 0;
+ clock_boottime_or_monotonic(),
+ now(clock_boottime_or_monotonic()) + next, 0,
+ manager_timer, m);
}
-static int sntp_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
+static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
Manager *m = userdata;
assert(m);
- assert(m->event_receive);
/* rearm timer */
- sntp_clock_watch_setup(m);
+ manager_clock_watch_setup(m);
/* skip our own jumps */
if (m->jumped) {
/* resync */
log_info("System time changed. Resyncing.");
m->poll_resync = true;
- sntp_send_request(m);
-
- return 0;
+ return manager_send_request(m);
}
/* wake up when the system time changes underneath us */
-static int sntp_clock_watch_setup(Manager *m) {
- struct itimerspec its = { .it_value.tv_sec = TIME_T_MAX };
- _cleanup_close_ int fd = -1;
- sd_event *e;
- sd_event_source *source;
+static int manager_clock_watch_setup(Manager *m) {
+
+ struct itimerspec its = {
+ .it_value.tv_sec = TIME_T_MAX
+ };
+
int r;
assert(m);
- assert(m->event_receive);
- fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
- if (fd < 0) {
+ m->event_clock_watch = sd_event_source_unref(m->event_clock_watch);
+ safe_close(m->clock_watch_fd);
+
+ m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
+ if (m->clock_watch_fd < 0) {
log_error("Failed to create timerfd: %m");
return -errno;
}
- if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) {
+ if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) {
log_error("Failed to set up timerfd: %m");
return -errno;
}
- e = sd_event_source_get_event(m->event_receive);
- r = sd_event_add_io(e, &source, fd, EPOLLIN, sntp_clock_watch, m);
+ r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m);
if (r < 0) {
log_error("Failed to create clock watch event source: %s", strerror(-r));
return r;
}
- sd_event_source_unref(m->event_clock_watch);
- m->event_clock_watch = source;
-
- if (m->clock_watch_fd >= 0)
- close(m->clock_watch_fd);
- m->clock_watch_fd = fd;
- fd = -1;
-
return 0;
}
-static int sntp_adjust_clock(Manager *m, double offset, int leap_sec) {
+static int manager_adjust_clock(Manager *m, double offset, int leap_sec) {
struct timex tmx = {};
int r;
+ assert(m);
+
/*
* For small deltas, tell the kernel to gradually adjust the system
* clock to the NTP time, larger deltas are just directly set.
- *
- * Clear STA_UNSYNC, it will enable the kernel's 11-minute mode, which
- * syncs the system time periodically to the hardware clock.
*/
if (fabs(offset) < NTP_MAX_ADJUST) {
- tmx.modes = ADJ_STATUS | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR;
+ tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR;
tmx.status = STA_PLL;
- tmx.offset = offset * USEC_PER_SEC;
- tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 6;
+ tmx.offset = offset * NSEC_PER_SEC;
+ tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4;
tmx.maxerror = 0;
tmx.esterror = 0;
- log_debug(" adjust (slew): %+.3f sec\n", (double)tmx.offset / USEC_PER_SEC);
+ log_debug(" adjust (slew): %+.3f sec\n", offset);
} else {
- tmx.modes = ADJ_SETOFFSET;
- d_to_tv(offset, &tmx.time);
+ tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET;
+
+ /* ADJ_NANO uses nanoseconds in the microseconds field */
+ tmx.time.tv_sec = (long)offset;
+ tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC;
+
+ /* the kernel expects -0.3s as {-1, 7000.000.000} */
+ if (tmx.time.tv_usec < 0) {
+ tmx.time.tv_sec -= 1;
+ tmx.time.tv_usec += NSEC_PER_SEC;
+ }
m->jumped = true;
- log_debug(" adjust (jump): %+.3f sec\n", tv_to_d(&tmx.time));
+ log_debug(" adjust (jump): %+.3f sec\n", offset);
}
+ /*
+ * An unset STA_UNSYNC will enable the kernel's 11-minute mode,
+ * which syncs the system time periodically to the RTC.
+ *
+ * In case the RTC runs in local time, never touch the RTC,
+ * we have no way to properly handle daylight saving changes and
+ * mobile devices moving between time zones.
+ */
+ if (m->rtc_local_time)
+ tmx.status |= STA_UNSYNC;
+
switch (leap_sec) {
case 1:
tmx.status |= STA_INS;
break;
}
- //r = clock_adjtime(CLOCK_REALTIME, &tmx);
- r = adjtimex(&tmx);
+ r = clock_adjtime(CLOCK_REALTIME, &tmx);
if (r < 0)
return r;
+ touch("/var/lib/systemd/clock");
+
+ m->drift_ppm = tmx.freq / 65536;
+
log_debug(" status : %04i %s\n"
- " time now : %li.%03lli\n"
+ " time now : %li.%03llu\n"
" constant : %li\n"
" offset : %+.3f sec\n"
- " freq offset : %+li (%+.3f ppm)\n",
- tmx.status, tmx.status & STA_UNSYNC ? "" : "sync",
- tmx.time.tv_sec, tmx.time.tv_usec / USEC_PER_MSEC,
+ " freq offset : %+li (%i ppm)\n",
+ tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync",
+ tmx.time.tv_sec, (unsigned long long) (tmx.time.tv_usec / NSEC_PER_MSEC),
tmx.constant,
- (double)tmx.offset / USEC_PER_SEC,
- tmx.freq, (double)tmx.freq / 65536);
+ (double)tmx.offset / NSEC_PER_SEC,
+ tmx.freq, m->drift_ppm);
return 0;
}
-static bool sntp_sample_spike_detection(Manager *m, double offset, double delay) {
+static bool manager_sample_spike_detection(Manager *m, double offset, double delay) {
unsigned int i, idx_cur, idx_new, idx_min;
double jitter;
double j;
+ assert(m);
+
m->packet_count++;
/* ignore initial sample */
return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter;
}
-static void sntp_adjust_poll(Manager *m, double offset, bool spike) {
+static void manager_adjust_poll(Manager *m, double offset, bool spike) {
+ assert(m);
+
if (m->poll_resync) {
m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC;
m->poll_resync = false;
}
}
-static int sntp_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
+static bool sockaddr_equal(union sockaddr_union *a, union sockaddr_union *b) {
+ assert(a);
+ assert(b);
+
+ if (a->sa.sa_family != b->sa.sa_family)
+ return false;
+
+ if (a->sa.sa_family == AF_INET)
+ return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr;
+
+ if (a->sa.sa_family == AF_INET6)
+ return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0;
+
+ return false;
+}
+
+static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
Manager *m = userdata;
- unsigned char buf[sizeof(struct ntp_msg)];
+ struct ntp_msg ntpmsg;
+
struct iovec iov = {
- .iov_base = buf,
- .iov_len = sizeof(buf),
+ .iov_base = &ntpmsg,
+ .iov_len = sizeof(ntpmsg),
};
union {
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(struct timeval))];
} control;
- struct sockaddr_in server_addr;
+ union sockaddr_union server_addr;
struct msghdr msghdr = {
.msg_iov = &iov,
.msg_iovlen = 1,
struct timespec now_ts;
struct timeval *recv_time;
ssize_t len;
- struct ntp_msg *ntpmsg;
double origin, receive, trans, dest;
double delay, offset;
bool spike;
int leap_sec;
int r;
+ assert(source);
+ assert(m);
+
if (revents & (EPOLLHUP|EPOLLERR)) {
- log_debug("Server connection returned error. Closing.");
- sntp_server_disconnect(m);
- return -ENOTCONN;
+ log_warning("Server connection returned error.");
+ return manager_connect(m);
}
len = recvmsg(fd, &msghdr, MSG_DONTWAIT);
if (len < 0) {
- log_debug("Error receiving message. Disconnecting.");
- return -EINVAL;
+ if (errno == EAGAIN)
+ return 0;
+
+ log_warning("Error receiving message. Disconnecting.");
+ return manager_connect(m);
}
if (iov.iov_len < sizeof(struct ntp_msg)) {
- log_debug("Invalid response from server. Disconnecting.");
- return -EINVAL;
+ log_warning("Invalid response from server. Disconnecting.");
+ return manager_connect(m);
}
- if (m->server_addr.sin_addr.s_addr != server_addr.sin_addr.s_addr) {
- log_debug("Response from unknown server. Disconnecting.");
- return -EINVAL;
+ if (!m->current_server_name ||
+ !m->current_server_address ||
+ !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) {
+ log_debug("Response from unknown server.");
+ return 0;
}
recv_time = NULL;
}
}
if (!recv_time) {
- log_debug("Invalid packet timestamp. Disconnecting.");
+ log_error("Invalid packet timestamp.");
return -EINVAL;
}
- ntpmsg = iov.iov_base;
if (!m->pending) {
log_debug("Unexpected reply. Ignoring.");
return 0;
}
/* check our "time cookie" (we just stored nanoseconds in the fraction field) */
- if (be32toh(ntpmsg->origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 ||
- be32toh(ntpmsg->origin_time.frac) != m->trans_time.tv_nsec) {
+ if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 ||
+ be32toh(ntpmsg.origin_time.frac) != m->trans_time.tv_nsec) {
log_debug("Invalid reply; not our transmit time. Ignoring.");
return 0;
}
- if (NTP_FIELD_LEAP(ntpmsg->field) == NTP_LEAP_NOTINSYNC) {
+ m->event_timeout = sd_event_source_unref(m->event_timeout);
+
+ if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 ||
+ be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) {
+ log_debug("Invalid reply, returned times before epoch. Ignoring.");
+ return manager_connect(m);
+ }
+
+ if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC) {
log_debug("Server is not synchronized. Disconnecting.");
- return -EINVAL;
+ return manager_connect(m);
}
- if (NTP_FIELD_VERSION(ntpmsg->field) != 4) {
- log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg->field));
- return -EINVAL;
+ if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) {
+ log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field));
+ return manager_connect(m);
}
- if (NTP_FIELD_MODE(ntpmsg->field) != NTP_MODE_SERVER) {
- log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg->field));
- return -EINVAL;
+ if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) {
+ log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field));
+ return manager_connect(m);
}
/* valid packet */
m->retry_interval = 0;
/* announce leap seconds */
- if (NTP_FIELD_LEAP(ntpmsg->field) & NTP_LEAP_PLUSSEC)
+ if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC)
leap_sec = 1;
- else if (NTP_FIELD_LEAP(ntpmsg->field) & NTP_LEAP_MINUSSEC)
+ else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC)
leap_sec = -1;
else
leap_sec = 0;
* The round-trip delay, d, and system clock offset, t, are defined as:
* d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2"
*/
- clock_gettime(CLOCK_MONOTONIC, &now_ts);
+ assert_se(clock_gettime(clock_boottime_or_monotonic(), &now_ts) >= 0);
origin = tv_to_d(recv_time) - (ts_to_d(&now_ts) - ts_to_d(&m->trans_time_mon)) + OFFSET_1900_1970;
- receive = ntp_ts_to_d(&ntpmsg->recv_time);
- trans = ntp_ts_to_d(&ntpmsg->trans_time);
+ receive = ntp_ts_to_d(&ntpmsg.recv_time);
+ trans = ntp_ts_to_d(&ntpmsg.trans_time);
dest = tv_to_d(recv_time) + OFFSET_1900_1970;
offset = ((receive - origin) + (trans - dest)) / 2;
delay = (dest - origin) - (trans - receive);
- spike = sntp_sample_spike_detection(m, offset, delay);
+ spike = manager_sample_spike_detection(m, offset, delay);
- sntp_adjust_poll(m, offset, spike);
+ manager_adjust_poll(m, offset, spike);
log_debug("NTP response:\n"
" leap : %u\n"
" version : %u\n"
" mode : %u\n"
" stratum : %u\n"
- " precision : %.3f sec (%d)\n"
+ " precision : %.6f sec (%d)\n"
" reference : %.4s\n"
" origin : %.3f\n"
" receive : %.3f\n"
" delay : %+.3f sec\n"
" packet count : %"PRIu64"\n"
" jitter : %.3f%s\n"
- " poll interval: %llu\n",
- NTP_FIELD_LEAP(ntpmsg->field),
- NTP_FIELD_VERSION(ntpmsg->field),
- NTP_FIELD_MODE(ntpmsg->field),
- ntpmsg->stratum,
- exp2(ntpmsg->precision), ntpmsg->precision,
- ntpmsg->stratum == 1 ? ntpmsg->refid : "n/a",
+ " poll interval: " USEC_FMT "\n",
+ NTP_FIELD_LEAP(ntpmsg.field),
+ NTP_FIELD_VERSION(ntpmsg.field),
+ NTP_FIELD_MODE(ntpmsg.field),
+ ntpmsg.stratum,
+ exp2(ntpmsg.precision), ntpmsg.precision,
+ ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a",
origin - OFFSET_1900_1970,
receive - OFFSET_1900_1970,
trans - OFFSET_1900_1970,
m->samples_jitter, spike ? " spike" : "",
m->poll_interval_usec / USEC_PER_SEC);
- log_info("%s: interval/delta/delay/jitter %llu/%+.3f/%.3f/%.3f%s",
- m->server, m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, spike ? " (ignored)" : "");
-
if (!spike) {
- r = sntp_adjust_clock(m, offset, leap_sec);
+ m->sync = true;
+ r = manager_adjust_clock(m, offset, leap_sec);
if (r < 0)
log_error("Failed to call clock_adjtime(): %m");
}
- r = sntp_arm_timer(m, m->poll_interval_usec);
- if (r < 0)
+ log_info("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+ippm%s",
+ m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_ppm,
+ spike ? " (ignored)" : "");
+
+ r = manager_arm_timer(m, m->poll_interval_usec);
+ if (r < 0) {
+ log_error("Failed to rearm timer: %s", strerror(-r));
return r;
+ }
return 0;
}
-static int sntp_server_connect(Manager *m, const char *server) {
- _cleanup_free_ char *s = NULL;
+static int manager_listen_setup(Manager *m) {
+ union sockaddr_union addr = {};
+ static const int tos = IPTOS_LOWDELAY;
+ static const int on = 1;
+ int r;
assert(m);
- assert(server);
- assert(m->server_socket >= 0);
- s = strdup(server);
- if (!s)
- return -ENOMEM;
+ assert(m->server_socket < 0);
+ assert(!m->event_receive);
+ assert(m->current_server_address);
+
+ addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family;
+
+ m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+ if (m->server_socket < 0)
+ return -errno;
- free(m->server);
- m->server = s;
- s = NULL;
+ r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen);
+ if (r < 0)
+ return -errno;
+
+ r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on));
+ if (r < 0)
+ return -errno;
- zero(m->server_addr);
- m->server_addr.sin_family = AF_INET;
- m->server_addr.sin_addr.s_addr = inet_addr(server);
+ setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
+
+ return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m);
+}
+
+static int manager_begin(Manager *m) {
+ _cleanup_free_ char *pretty = NULL;
+ int r;
+
+ assert(m);
+ assert_return(m->current_server_name, -EHOSTUNREACH);
+ assert_return(m->current_server_address, -EHOSTUNREACH);
m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC;
- return sntp_send_request(m);
+ server_address_pretty(m->current_server_address, &pretty);
+ log_info("Using NTP server %s (%s).", strna(pretty), m->current_server_name->string);
+ sd_notifyf(false, "STATUS=Using Time Server %s (%s).", strna(pretty), m->current_server_name->string);
+
+ r = manager_listen_setup(m);
+ if (r < 0) {
+ log_warning("Failed to setup connection socket: %s", strerror(-r));
+ return r;
+ }
+
+ r = manager_clock_watch_setup(m);
+ if (r < 0)
+ return r;
+
+ return manager_send_request(m);
}
-static void sntp_server_disconnect(Manager *m) {
- if (!m->server)
- return;
+static void server_name_flush_addresses(ServerName *n) {
+ ServerAddress *a;
- m->event_timer = sd_event_source_unref(m->event_timer);
+ assert(n);
- m->event_clock_watch = sd_event_source_unref(m->event_clock_watch);
- if (m->clock_watch_fd > 0)
- close(m->clock_watch_fd);
- m->clock_watch_fd = -1;
+ while ((a = n->addresses)) {
+ LIST_REMOVE(addresses, n->addresses, a);
+ free(a);
+ }
+}
- m->event_receive = sd_event_source_unref(m->event_receive);
- if (m->server_socket > 0)
- close(m->server_socket);
- m->server_socket = -1;
+static void manager_flush_names(Manager *m) {
+ ServerName *n;
- zero(m->server_addr);
- free(m->server);
- m->server = NULL;
+ assert(m);
+
+ while ((n = m->servers)) {
+ LIST_REMOVE(names, m->servers, n);
+ free(n->string);
+ server_name_flush_addresses(n);
+ free(n);
+ }
}
-static int sntp_listen_setup(Manager *m) {
- _cleanup_close_ int fd = -1;
- struct sockaddr_in addr;
- const int on = 1;
- const int tos = IPTOS_LOWDELAY;
+static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
+ Manager *m = userdata;
+ ServerAddress *a, *last = NULL;
+
+ assert(q);
+ assert(m);
+ assert(m->current_server_name);
+
+ m->resolve_query = sd_resolve_query_unref(m->resolve_query);
+
+ if (ret != 0) {
+ log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret));
+
+ /* Try next host */
+ return manager_connect(m);
+ }
+
+ server_name_flush_addresses(m->current_server_name);
+
+ for (; ai; ai = ai->ai_next) {
+ _cleanup_free_ char *pretty = NULL;
+
+ assert(ai->ai_addr);
+ assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data));
+ assert(ai->ai_addrlen <= sizeof(union sockaddr_union));
+
+ if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) {
+ log_warning("Unsuitable address protocol for %s", m->current_server_name->string);
+ continue;
+ }
+
+ a = new0(ServerAddress, 1);
+ if (!a)
+ return log_oom();
+
+ memcpy(&a->sockaddr, ai->ai_addr, ai->ai_addrlen);
+ a->socklen = ai->ai_addrlen;
+
+ LIST_INSERT_AFTER(addresses, m->current_server_name->addresses, last, a);
+ last = a;
+
+ sockaddr_pretty(&a->sockaddr.sa, a->socklen, true, &pretty);
+ log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string);
+ }
+
+ if (!m->current_server_name->addresses) {
+ log_error("Failed to find suitable address for host %s.", m->current_server_name->string);
+
+ /* Try next host */
+ return manager_connect(m);
+ }
+
+ m->current_server_address = m->current_server_name->addresses;
+
+ return manager_begin(m);
+}
+
+static int manager_retry(sd_event_source *source, usec_t usec, void *userdata) {
+ Manager *m = userdata;
+
+ assert(m);
+
+ return manager_connect(m);
+}
+
+static int manager_connect(Manager *m) {
+
+ struct addrinfo hints = {
+ .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG,
+ .ai_socktype = SOCK_DGRAM,
+ };
int r;
- fd = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
- if (fd < 0)
- return -errno;
+ assert(m);
- zero(addr);
- addr.sin_family = AF_INET;
- r = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
- if (r < 0)
- return -errno;
+ manager_disconnect(m);
- r = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on));
- if (r < 0)
- return -errno;
+ m->event_retry = sd_event_source_unref(m->event_retry);
+ if (!ratelimit_test(&m->ratelimit)) {
+ log_debug("Slowing down attempts to contact servers.");
- r = setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
- if (r < 0)
- return -errno;
+ r = sd_event_add_time(m->event, &m->event_retry, clock_boottime_or_monotonic(), now(clock_boottime_or_monotonic()) + RETRY_USEC, 0, manager_retry, m);
+ if (r < 0) {
+ log_error("Failed to create retry timer: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+ }
+
+ /* If we already are operating on some address, switch to the
+ * next one. */
+ if (m->current_server_address && m->current_server_address->addresses_next)
+ m->current_server_address = m->current_server_address->addresses_next;
+ else {
+ /* Hmm, we are through all addresses, let's look for the next host instead */
+ m->current_server_address = NULL;
+
+ if (m->current_server_name && m->current_server_name->names_next)
+ m->current_server_name = m->current_server_name->names_next;
+ else {
+ if (!m->servers) {
+ m->current_server_name = NULL;
+ log_debug("No server found.");
+ return 0;
+ }
+
+ m->current_server_name = m->servers;
+ }
+
+ /* Tell the resolver to reread /etc/resolv.conf, in
+ * case it changed. */
+ res_init();
+
+ r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m);
+ if (r < 0) {
+ log_error("Failed to create resolver: %s", strerror(-r));
+ return r;
+ }
+
+ return 1;
+ }
- r = sd_event_add_io(m->event, &m->event_receive, fd, EPOLLIN, sntp_receive_response, m);
+ r = manager_begin(m);
if (r < 0)
return r;
- m->server_socket = fd;
- fd = -1;
+ return 1;
+}
+
+static int manager_add_server(Manager *m, const char *server) {
+ ServerName *n, *tail;
+
+ assert(m);
+ assert(server);
+
+ n = new0(ServerName, 1);
+ if (!n)
+ return -ENOMEM;
+
+ n->string = strdup(server);
+ if (!n->string) {
+ free(n);
+ return -ENOMEM;
+ }
+
+ LIST_FIND_TAIL(names, m->servers, tail);
+ LIST_INSERT_AFTER(names, m->servers, tail, n);
return 0;
}
+static int manager_add_server_string(Manager *m, const char *string) {
+ const char *word, *state;
+ size_t l;
+ int r;
+
+ assert(m);
+ assert(string);
+
+ FOREACH_WORD_QUOTED(word, l, string, state) {
+ char t[l+1];
+
+ memcpy(t, word, l);
+ t[l] = 0;
+
+ r = manager_add_server(m, t);
+ if (r < 0)
+ log_error("Failed to add server %s to configuration, ignoring: %s", t, strerror(-r));
+ }
+ if (!isempty(state))
+ log_warning("Trailing garbage at the end of server list, ignoring.");
+
+ return 0;
+}
+
+static void manager_disconnect(Manager *m) {
+ assert(m);
+
+ m->resolve_query = sd_resolve_query_unref(m->resolve_query);
+
+ m->event_timer = sd_event_source_unref(m->event_timer);
+
+ m->event_receive = sd_event_source_unref(m->event_receive);
+ m->server_socket = safe_close(m->server_socket);
+
+ m->event_clock_watch = sd_event_source_unref(m->event_clock_watch);
+ m->clock_watch_fd = safe_close(m->clock_watch_fd);
+
+ m->event_timeout = sd_event_source_unref(m->event_timeout);
+
+ sd_notifyf(false, "STATUS=Idle.");
+}
+
static int manager_new(Manager **ret) {
_cleanup_manager_free_ Manager *m = NULL;
int r;
+ assert(ret);
+
m = new0(Manager, 1);
if (!m)
return -ENOMEM;
+ m->server_socket = m->clock_watch_fd = -1;
+
+ RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST);
+
r = sd_event_default(&m->event);
if (r < 0)
return r;
- r = sntp_listen_setup(m);
+ sd_event_set_watchdog(m->event, true);
+
+ sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
+ sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
+
+ r = sd_resolve_default(&m->resolve);
if (r < 0)
return r;
- r = sntp_clock_watch_setup(m);
+ r = sd_resolve_attach_event(m->resolve, m->event, 0);
if (r < 0)
return r;
}
static void manager_free(Manager *m) {
-
if (!m)
return;
+ manager_disconnect(m);
+ manager_flush_names(m);
+
+ sd_event_source_unref(m->event_retry);
+
+ sd_event_source_unref(m->network_event_source);
+ sd_network_monitor_unref(m->network_monitor);
+
+ sd_resolve_unref(m->resolve);
sd_event_unref(m->event);
+
free(m);
}
+int config_parse_servers(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Manager *m = userdata;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ manager_flush_names(m);
+ manager_add_server_string(m, rvalue);
+
+ return 0;
+}
+
+static int manager_parse_config_file(Manager *m) {
+ return config_parse(NULL, "/etc/systemd/timesyncd.conf", NULL,
+ "Time\0",
+ config_item_perf_lookup, timesyncd_gperf_lookup,
+ false, false, true, m);
+}
+
+static bool network_is_online(void) {
+ _cleanup_free_ char *state = NULL;
+ int r;
+
+ r = sd_network_get_operational_state(&state);
+ if (r >= 0 && STR_IN_SET(state, "routable", "degraded"))
+ return true;
+
+ return false;
+}
+
+static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents,
+ void *userdata) {
+ Manager *m = userdata;
+ bool connected, online;
+ int r;
+
+ assert(m);
+
+ /* check if the machine is online */
+ online = network_is_online();
+
+ /* check if the client is currently connected */
+ connected = (m->server_socket != -1);
+
+ if (connected && !online) {
+ log_info("No network connectivity, watching for changes.");
+ manager_disconnect(m);
+ } else if (!connected && online) {
+ log_info("Network configuration changed, trying to establish connection.");
+ if (m->current_server_address) {
+ r = manager_begin(m);
+ if (r < 0)
+ return r;
+ } else {
+ r = manager_connect(m);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ sd_network_monitor_flush(m->network_monitor);
+
+ return 0;
+}
+
+static int manager_network_monitor_listen(Manager *m) {
+ _cleanup_event_source_unref_ sd_event_source *event_source = NULL;
+ _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL;
+ int r, fd, events;
+
+ r = sd_network_monitor_new(&monitor, NULL);
+ if (r < 0)
+ return r;
+
+ fd = sd_network_monitor_get_fd(monitor);
+ if (fd < 0)
+ return fd;
+
+ events = sd_network_monitor_get_events(monitor);
+ if (events < 0)
+ return events;
+
+ r = sd_event_add_io(m->event, &event_source, fd, events,
+ &manager_network_event_handler, m);
+ if (r < 0)
+ return r;
+
+ m->network_monitor = monitor;
+ m->network_event_source = event_source;
+ monitor = NULL;
+ event_source = NULL;
+
+ return 0;
+}
+
int main(int argc, char *argv[]) {
+ const char *user = "systemd-timesync";
_cleanup_manager_free_ Manager *m = NULL;
- const char *server;
+ uid_t uid;
+ gid_t gid;
int r;
+ if (argc > 1) {
+ log_error("This program does not take arguments.");
+ return EXIT_FAILURE;
+ }
+
log_set_target(LOG_TARGET_AUTO);
+ log_set_facility(LOG_CRON);
log_parse_environment();
log_open();
- r = manager_new(&m);
+ umask(0022);
+
+ r = get_user_creds(&user, &uid, &gid, NULL, NULL);
+ if (r < 0) {
+ log_error("Cannot resolve user name %s: %s", user, strerror(-r));
+ return r;
+ }
+
+ r = load_clock_timestamp(uid, gid);
if (r < 0)
goto out;
- server = "216.239.32.15"; /* time1.google.com */
+ r = drop_privileges(uid, gid, (1ULL << CAP_SYS_TIME));
+ if (r < 0)
+ goto out;
- sd_notifyf(false,
- "READY=1\n"
- "STATUS=Connecting to %s", server);
+ assert_se(sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, -1) == 0);
- r = sntp_server_connect(m, server);
- if (r < 0)
+ r = manager_new(&m);
+ if (r < 0) {
+ log_error("Failed to allocate manager: %s", strerror(-r));
+ goto out;
+ }
+
+ if (clock_is_localtime() > 0) {
+ log_info("The system is configured to read the RTC time in the local time zone. "
+ "This mode can not be fully supported. All system time to RTC updates are disabled.");
+ m->rtc_local_time = true;
+ }
+
+ manager_add_server_string(m, NTP_SERVERS);
+ manager_parse_config_file(m);
+
+ r = manager_network_monitor_listen(m);
+ if (r < 0) {
+ log_error("Failed to listen to networkd events: %s", strerror(-r));
goto out;
+ }
- sd_notifyf(false,
- "STATUS=Connected to %s", server);
+ log_debug("systemd-timesyncd running as pid %lu", (unsigned long) getpid());
+ sd_notify(false, "READY=1");
+
+ if (network_is_online()) {
+ r = manager_connect(m);
+ if (r < 0)
+ goto out;
+ }
r = sd_event_loop(m->event);
- if (r < 0)
+ if (r < 0) {
+ log_error("Failed to run event loop: %s", strerror(-r));
goto out;
+ }
+
+ sd_event_get_exit_code(m->event, &r);
+
+ /* if we got an authoritative time, store it in the file system */
+ if (m->sync)
+ touch("/var/lib/systemd/clock");
out:
+ sd_notify(false, "STATUS=Shutting down...");
+
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
~ianmdlvl / elogind.git / blobdiff