410 lines
9.6 KiB
C
410 lines
9.6 KiB
C
/*
|
|
* 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
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
static u_long adjust_timer; /* second timer */
|
|
static u_long keys_timer; /* minute timer */
|
|
static u_long stats_timer; /* stats timer */
|
|
static u_long huffpuff_timer; /* huff-n'-puff timer */
|
|
static u_long interface_timer; /* interface update timer */
|
|
#ifdef OPENSSL
|
|
static u_long revoke_timer; /* keys revoke timer */
|
|
u_char sys_revoke = KEY_REVOKE; /* keys revoke timeout (log2 s) */
|
|
#endif /* OPENSSL */
|
|
|
|
/*
|
|
* Statistics counter for the interested.
|
|
*/
|
|
volatile u_long alarm_overflow;
|
|
|
|
#define MINUTE 60
|
|
#define HOUR (60*60)
|
|
|
|
u_long current_time;
|
|
|
|
/*
|
|
* 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 P((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)
|
|
{
|
|
# if defined SYS_WINNT & !defined(SYS_CYGWIN32)
|
|
HANDLE hToken = INVALID_HANDLE_VALUE;
|
|
TOKEN_PRIVILEGES tkp;
|
|
# endif /* SYS_WINNT */
|
|
|
|
/*
|
|
* 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 */
|
|
_tzset();
|
|
|
|
/*
|
|
* Get privileges needed for fiddling with the clock
|
|
*/
|
|
|
|
/* get the current process token handle */
|
|
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) {
|
|
msyslog(LOG_ERR, "OpenProcessToken failed: %m");
|
|
exit(1);
|
|
}
|
|
/* get the LUID for system-time privilege. */
|
|
LookupPrivilegeValue(NULL, SE_SYSTEMTIME_NAME, &tkp.Privileges[0].Luid);
|
|
tkp.PrivilegeCount = 1; /* one privilege to set */
|
|
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
|
|
/* get set-time privilege for this process. */
|
|
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, (PTOKEN_PRIVILEGES) NULL, 0);
|
|
/* cannot test return value of AdjustTokenPrivileges. */
|
|
if (GetLastError() != ERROR_SUCCESS) {
|
|
msyslog(LOG_ERR, "AdjustTokenPrivileges failed: %m");
|
|
}
|
|
|
|
/*
|
|
* 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 - dispatch anyone who needs to be
|
|
*/
|
|
void
|
|
timer(void)
|
|
{
|
|
register struct peer *peer, *next_peer;
|
|
#ifdef OPENSSL
|
|
char statstr[NTP_MAXSTRLEN]; /* statistics for filegen */
|
|
#endif /* OPENSSL */
|
|
u_int n;
|
|
|
|
current_time += (1<<EVENT_TIMEOUT);
|
|
|
|
/*
|
|
* Adjustment timeout first.
|
|
*/
|
|
if (adjust_timer <= current_time) {
|
|
adjust_timer += 1;
|
|
adj_host_clock();
|
|
kod_proto();
|
|
#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);
|
|
if (peer->nextdate <= current_time) {
|
|
#ifdef REFCLOCK
|
|
if (peer->flags & FLAG_REFCLOCK)
|
|
refclock_transmit(peer);
|
|
else
|
|
transmit(peer);
|
|
#else /* REFCLOCK */
|
|
transmit(peer);
|
|
#endif /* REFCLOCK */
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Garbage collect expired keys.
|
|
*/
|
|
if (keys_timer <= current_time) {
|
|
keys_timer += MINUTE;
|
|
auth_agekeys();
|
|
}
|
|
|
|
/*
|
|
* Huff-n'-puff filter
|
|
*/
|
|
if (huffpuff_timer <= current_time) {
|
|
huffpuff_timer += HUFFPUFF;
|
|
huffpuff();
|
|
}
|
|
|
|
#ifdef OPENSSL
|
|
/*
|
|
* Garbage collect old keys and generate new private value
|
|
*/
|
|
if (revoke_timer <= current_time) {
|
|
revoke_timer += RANDPOLL(sys_revoke);
|
|
expire_all();
|
|
sprintf(statstr, "refresh ts %u", ntohl(hostval.tstamp));
|
|
record_crypto_stats(NULL, statstr);
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf("timer: %s\n", statstr);
|
|
#endif
|
|
}
|
|
#endif /* OPENSSL */
|
|
|
|
/*
|
|
* interface update timer
|
|
*/
|
|
if (interface_interval && interface_timer <= current_time) {
|
|
timer_interfacetimeout(current_time + interface_interval);
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf("timer: interface update\n");
|
|
#endif
|
|
interface_update(NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* Finally, periodically write stats.
|
|
*/
|
|
if (stats_timer <= current_time) {
|
|
if (stats_timer != 0)
|
|
write_stats();
|
|
stats_timer += stats_write_period;
|
|
}
|
|
}
|
|
|
|
|
|
#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;
|
|
}
|
|
|