/*
* ntp_timer.c - event timer support routines
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "ntp_machine.h"
#include "ntpd.h"
#include "ntp_stdlib.h"
#include <stdio.h>
#include <signal.h>
#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined(HAVE_IO_COMPLETION_PORT)
# include "ntp_iocompletionport.h"
# include "ntp_timer.h"
#endif
#ifdef KERNEL_PLL
#include "ntp_syscall.h"
#endif /* KERNEL_PLL */
#ifdef OPENSSL
#include <openssl/rand.h>
#endif /* OPENSSL */
/*
* These routines provide support for the event timer. The timer is
* implemented by an interrupt routine which sets a flag once every
* 2**EVENT_TIMEOUT seconds (currently 4), and a timer routine which
* is called when the mainline code gets around to seeing the flag.
* The timer routine dispatches the clock adjustment code if its time
* has come, then searches the timer queue for expiries which are
* dispatched to the transmit procedure. Finally, we call the hourly
* procedure to do cleanup and print a message.
*/
volatile int interface_interval = 300; /* update interface every 5 minutes as default */
/*
* Alarm flag. The mainline code imports this.
*/
volatile int alarm_flag;
/*
* The counters and timeouts
*/
static u_long interface_timer; /* interface update timer */
static u_long adjust_timer; /* second timer */
static u_long stats_timer; /* stats timer */
static u_long huffpuff_timer; /* huff-n'-puff timer */
u_long leapsec; /* leapseconds countdown */
l_fp sys_time; /* current system time */
#ifdef OPENSSL
static u_long revoke_timer; /* keys revoke timer */
static u_long keys_timer; /* session key timer */
u_long sys_revoke = KEY_REVOKE; /* keys revoke timeout (log2 s) */
u_long sys_automax = NTP_AUTOMAX; /* key list timeout (log2 s) */
#endif /* OPENSSL */
/*
* Statistics counter for the interested.
*/
volatile u_long alarm_overflow;
#define MINUTE 60
#define HOUR (60 * MINUTE)
#define DAY (24 * HOUR)
u_long current_time; /* seconds since startup */
/*
* Stats. Number of overflows and number of calls to transmit().
*/
u_long timer_timereset;
u_long timer_overflows;
u_long timer_xmtcalls;
#if defined(VMS)
static int vmstimer[2]; /* time for next timer AST */
static int vmsinc[2]; /* timer increment */
#endif /* VMS */
#if defined SYS_WINNT
static HANDLE WaitableTimerHandle = NULL;
#else
static RETSIGTYPE alarming (int);
#endif /* SYS_WINNT */
#if !defined(VMS)
# if !defined SYS_WINNT || defined(SYS_CYGWIN32)
# ifndef HAVE_TIMER_SETTIME
struct itimerval itimer;
# else
static timer_t ntpd_timerid;
struct itimerspec itimer;
# endif /* HAVE_TIMER_SETTIME */
# endif /* SYS_WINNT */
#endif /* VMS */
/*
* reinit_timer - reinitialize interval timer.
*/
void
reinit_timer(void)
{
#if !defined(SYS_WINNT) && !defined(VMS)
# if defined(HAVE_TIMER_CREATE) && defined(HAVE_TIMER_SETTIME)
timer_gettime(ntpd_timerid, &itimer);
if (itimer.it_value.tv_sec < 0 || itimer.it_value.tv_sec > (1<<EVENT_TIMEOUT)) {
itimer.it_value.tv_sec = (1<<EVENT_TIMEOUT);
}
if (itimer.it_value.tv_nsec < 0 ) {
itimer.it_value.tv_nsec = 0;
}
if (itimer.it_value.tv_sec == 0 && itimer.it_value.tv_nsec == 0) {
itimer.it_value.tv_sec = (1<<EVENT_TIMEOUT);
itimer.it_value.tv_nsec = 0;
}
itimer.it_interval.tv_sec = (1<<EVENT_TIMEOUT);
itimer.it_interval.tv_nsec = 0;
timer_settime(ntpd_timerid, 0 /*!TIMER_ABSTIME*/, &itimer, NULL);
# else
getitimer(ITIMER_REAL, &itimer);
if (itimer.it_value.tv_sec < 0 || itimer.it_value.tv_sec > (1<<EVENT_TIMEOUT)) {
itimer.it_value.tv_sec = (1<<EVENT_TIMEOUT);
}
if (itimer.it_value.tv_usec < 0 ) {
itimer.it_value.tv_usec = 0;
}
if (itimer.it_value.tv_sec == 0 && itimer.it_value.tv_usec == 0) {
itimer.it_value.tv_sec = (1<<EVENT_TIMEOUT);
itimer.it_value.tv_usec = 0;
}
itimer.it_interval.tv_sec = (1<<EVENT_TIMEOUT);
itimer.it_interval.tv_usec = 0;
setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
# endif
# endif /* VMS */
}
/*
* init_timer - initialize the timer data structures
*/
void
init_timer(void)
{
/*
* Initialize...
*/
alarm_flag = 0;
alarm_overflow = 0;
adjust_timer = 1;
stats_timer = 0;
huffpuff_timer = 0;
interface_timer = 0;
current_time = 0;
timer_overflows = 0;
timer_xmtcalls = 0;
timer_timereset = 0;
#if !defined(SYS_WINNT)
/*
* Set up the alarm interrupt. The first comes 2**EVENT_TIMEOUT
* seconds from now and they continue on every 2**EVENT_TIMEOUT
* seconds.
*/
# if !defined(VMS)
# if defined(HAVE_TIMER_CREATE) && defined(HAVE_TIMER_SETTIME)
if (timer_create (CLOCK_REALTIME, NULL, &ntpd_timerid) ==
# ifdef SYS_VXWORKS
ERROR
# else
-1
# endif
)
{
fprintf (stderr, "timer create FAILED\n");
exit (0);
}
(void) signal_no_reset(SIGALRM, alarming);
itimer.it_interval.tv_sec = itimer.it_value.tv_sec = (1<<EVENT_TIMEOUT);
itimer.it_interval.tv_nsec = itimer.it_value.tv_nsec = 0;
timer_settime(ntpd_timerid, 0 /*!TIMER_ABSTIME*/, &itimer, NULL);
# else
(void) signal_no_reset(SIGALRM, alarming);
itimer.it_interval.tv_sec = itimer.it_value.tv_sec = (1<<EVENT_TIMEOUT);
itimer.it_interval.tv_usec = itimer.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
# endif
# else /* VMS */
vmsinc[0] = 10000000; /* 1 sec */
vmsinc[1] = 0;
lib$emul(&(1<<EVENT_TIMEOUT), &vmsinc, &0, &vmsinc);
sys$gettim(&vmstimer); /* that's "now" as abstime */
lib$addx(&vmsinc, &vmstimer, &vmstimer);
sys$setimr(0, &vmstimer, alarming, alarming, 0);
# endif /* VMS */
#else /* SYS_WINNT */
/*
* Set up timer interrupts for every 2**EVENT_TIMEOUT seconds
* Under Windows/NT,
*/
WaitableTimerHandle = CreateWaitableTimer(NULL, FALSE, NULL);
if (WaitableTimerHandle == NULL) {
msyslog(LOG_ERR, "CreateWaitableTimer failed: %m");
exit(1);
}
else {
DWORD Period = (1<<EVENT_TIMEOUT) * 1000;
LARGE_INTEGER DueTime;
DueTime.QuadPart = Period * 10000i64;
if (!SetWaitableTimer(WaitableTimerHandle, &DueTime, Period, NULL, NULL, FALSE) != NO_ERROR) {
msyslog(LOG_ERR, "SetWaitableTimer failed: %m");
exit(1);
}
}
#endif /* SYS_WINNT */
}
#if defined(SYS_WINNT)
extern HANDLE
get_timer_handle(void)
{
return WaitableTimerHandle;
}
#endif
/*
* timer - event timer
*/
void
timer(void)
{
register struct peer *peer, *next_peer;
u_int n;
/*
* The basic timerevent is one second. This is used to adjust
* the system clock in time and frequency, implement the
* kiss-o'-deatch function and implement the association
* polling function..
*/
current_time++;
get_systime(&sys_time);
if (adjust_timer <= current_time) {
adjust_timer += 1;
adj_host_clock();
#ifdef REFCLOCK
for (n = 0; n < NTP_HASH_SIZE; n++) {
for (peer = peer_hash[n]; peer != 0; peer = next_peer) {
next_peer = peer->next;
if (peer->flags & FLAG_REFCLOCK)
refclock_timer(peer);
}
}
#endif /* REFCLOCK */
}
/*
* Now dispatch any peers whose event timer has expired. Be
* careful here, since the peer structure might go away as the
* result of the call.
*/
for (n = 0; n < NTP_HASH_SIZE; n++) {
for (peer = peer_hash[n]; peer != 0; peer = next_peer) {
next_peer = peer->next;
if (peer->action && peer->nextaction <=
current_time)
peer->action(peer);
/*
* Restrain the non-burst packet rate not more
* than one packet every 16 seconds. This is
* usually tripped using iburst and minpoll of
* 128 s or less.
*/
if (peer->throttle > 0)
peer->throttle--;
if (peer->nextdate <= current_time) {
#ifdef REFCLOCK
if (peer->flags & FLAG_REFCLOCK)
refclock_transmit(peer);
else
transmit(peer);
#else /* REFCLOCK */
transmit(peer);
#endif /* REFCLOCK */
}
}
}
/*
* Orphan mode is active when enabled and when no servers less
* than the orphan stratum are available. A server with no other
* synchronization source is an orphan. It shows offset zero and
* reference ID the loopback address.
*/
if (sys_orphan < STRATUM_UNSPEC && sys_peer == NULL) {
if (sys_leap == LEAP_NOTINSYNC) {
sys_leap = LEAP_NOWARNING;
#ifdef OPENSSL
if (crypto_flags)
crypto_update();
#endif /* OPENSSL */
}
sys_stratum = (u_char)sys_orphan;
if (sys_stratum > 1)
sys_refid = htonl(LOOPBACKADR);
else
memcpy(&sys_refid, "LOOP", 4);
sys_offset = 0;
sys_rootdelay = 0;
sys_rootdisp = 0;
}
/*
* Leapseconds. If a leap is pending, decrement the time
* remaining. If less than one day remains, set the leap bits.
* When no time remains, clear the leap bits and increment the
* TAI. If kernel suppport is not available, do the leap
* crudely. Note a leap cannot be pending unless the clock is
* set.
*/
if (leapsec > 0) {
leapsec--;
if (leapsec == 0) {
sys_leap = LEAP_NOWARNING;
sys_tai = leap_tai;
#ifdef KERNEL_PLL
if (!(pll_control && kern_enable))
step_systime(-1.0);
#else /* KERNEL_PLL */
#ifndef SYS_WINNT /* WinNT port has its own leap second handling */
step_systime(-1.0);
#endif /* SYS_WINNT */
#endif /* KERNEL_PLL */
report_event(EVNT_LEAP, NULL, NULL);
} else {
if (leapsec < DAY)
sys_leap = LEAP_ADDSECOND;
if (leap_tai > 0)
sys_tai = leap_tai - 1;
}
}
/*
* Update huff-n'-puff filter.
*/
if (huffpuff_timer <= current_time) {
huffpuff_timer += HUFFPUFF;
huffpuff();
}
#ifdef OPENSSL
/*
* Garbage collect expired keys.
*/
if (keys_timer <= current_time) {
keys_timer += 1 << sys_automax;
auth_agekeys();
}
/*
* Garbage collect key list and generate new private value. The
* timer runs only after initial synchronization and fires about
* once per day.
*/
if (revoke_timer <= current_time && sys_leap !=
LEAP_NOTINSYNC) {
revoke_timer += 1 << sys_revoke;
RAND_bytes((u_char *)&sys_private, 4);
}
#endif /* OPENSSL */
/*
* Interface update timer
*/
if (interface_interval && interface_timer <= current_time) {
timer_interfacetimeout(current_time +
interface_interval);
DPRINTF(2, ("timer: interface update\n"));
interface_update(NULL, NULL);
}
/*
* Finally, write hourly stats.
*/
if (stats_timer <= current_time) {
stats_timer += HOUR;
write_stats();
if (sys_tai != 0 && sys_time.l_ui > leap_expire)
report_event(EVNT_LEAPVAL, NULL, NULL);
}
}
#ifndef SYS_WINNT
/*
* alarming - tell the world we've been alarmed
*/
static RETSIGTYPE
alarming(
int sig
)
{
#if !defined(VMS)
if (initializing)
return;
if (alarm_flag)
alarm_overflow++;
else
alarm_flag++;
#else /* VMS AST routine */
if (!initializing) {
if (alarm_flag) alarm_overflow++;
else alarm_flag = 1; /* increment is no good */
}
lib$addx(&vmsinc,&vmstimer,&vmstimer);
sys$setimr(0,&vmstimer,alarming,alarming,0);
#endif /* VMS */
}
#endif /* SYS_WINNT */
void
timer_interfacetimeout(u_long timeout)
{
interface_timer = timeout;
}
/*
* timer_clr_stats - clear timer module stat counters
*/
void
timer_clr_stats(void)
{
timer_overflows = 0;
timer_xmtcalls = 0;
timer_timereset = current_time;
}
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