386 lines
8.5 KiB
C
386 lines
8.5 KiB
C
/*
|
|
* refclock_dumbclock - clock driver for a unknown time distribution system
|
|
* that only provides hh:mm:ss (in local time, yet!).
|
|
*/
|
|
|
|
/*
|
|
* Must interpolate back to local time. Very annoying.
|
|
*/
|
|
#define GET_LOCALTIME
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#if defined(SYS_WINNT)
|
|
#undef close
|
|
#define close closesocket
|
|
#endif
|
|
|
|
#if defined(REFCLOCK) && defined(CLOCK_DUMBCLOCK)
|
|
|
|
#include "ntpd.h"
|
|
#include "ntp_io.h"
|
|
#include "ntp_refclock.h"
|
|
#include "ntp_calendar.h"
|
|
#include "ntp_stdlib.h"
|
|
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
/*
|
|
* This driver supports a generic dumb clock that only outputs hh:mm:ss,
|
|
* in local time, no less.
|
|
*
|
|
* Input format:
|
|
*
|
|
* hh:mm:ss <cr>
|
|
*
|
|
* hh:mm:ss -- what you'd expect, with a 24 hour clock. (Heck, that's the only
|
|
* way it could get stupider.) We take time on the <cr>.
|
|
*
|
|
* The original source of this module was the WWVB module.
|
|
*/
|
|
|
|
/*
|
|
* Interface definitions
|
|
*/
|
|
#define DEVICE "/dev/dumbclock%d" /* device name and unit */
|
|
#define SPEED232 B9600 /* uart speed (9600 baud) */
|
|
#define PRECISION (-13) /* precision assumed (about 100 us) */
|
|
#define REFID "dumbclock" /* reference ID */
|
|
#define DESCRIPTION "Dumb clock" /* WRU */
|
|
|
|
|
|
/*
|
|
* Insanity check. Since the time is local, we need to make sure that during midnight
|
|
* transitions, we can convert back to Unix time. If the conversion results in some number
|
|
* worse than this number of seconds away, assume the next day and retry.
|
|
*/
|
|
#define INSANE_SECONDS 3600
|
|
|
|
/*
|
|
* Dumb clock control structure
|
|
*/
|
|
struct dumbclock_unit {
|
|
u_char tcswitch; /* timecode switch */
|
|
l_fp laststamp; /* last receive timestamp */
|
|
u_char lasthour; /* last hour (for monitor) */
|
|
u_char linect; /* count ignored lines (for monitor */
|
|
struct tm ymd; /* struct tm for y/m/d only */
|
|
};
|
|
|
|
/*
|
|
* Function prototypes
|
|
*/
|
|
static int dumbclock_start P((int, struct peer *));
|
|
static void dumbclock_shutdown P((int, struct peer *));
|
|
static void dumbclock_receive P((struct recvbuf *));
|
|
#if 0
|
|
static void dumbclock_poll P((int, struct peer *));
|
|
#endif
|
|
|
|
/*
|
|
* Transfer vector
|
|
*/
|
|
struct refclock refclock_dumbclock = {
|
|
dumbclock_start, /* start up driver */
|
|
dumbclock_shutdown, /* shut down driver */
|
|
noentry, /* poll the driver -- a nice fabrication */
|
|
noentry, /* not used */
|
|
noentry, /* not used */
|
|
noentry, /* not used */
|
|
NOFLAGS /* not used */
|
|
};
|
|
|
|
|
|
/*
|
|
* dumbclock_start - open the devices and initialize data for processing
|
|
*/
|
|
static int
|
|
dumbclock_start(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
register struct dumbclock_unit *up;
|
|
struct refclockproc *pp;
|
|
int fd;
|
|
char device[20];
|
|
struct tm *tm_time_p;
|
|
time_t now;
|
|
|
|
/*
|
|
* Open serial port. Don't bother with CLK line discipline, since
|
|
* it's not available.
|
|
*/
|
|
(void)sprintf(device, DEVICE, unit);
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf ("starting Dumbclock with device %s\n",device);
|
|
#endif
|
|
fd = refclock_open(device, SPEED232, 0);
|
|
if (fd < 0)
|
|
return (0);
|
|
|
|
/*
|
|
* Allocate and initialize unit structure
|
|
*/
|
|
up = (struct dumbclock_unit *)emalloc(sizeof(struct dumbclock_unit));
|
|
if (up == NULL) {
|
|
(void) close(fd);
|
|
return (0);
|
|
}
|
|
memset((char *)up, 0, sizeof(struct dumbclock_unit));
|
|
pp = peer->procptr;
|
|
pp->unitptr = (caddr_t)up;
|
|
pp->io.clock_recv = dumbclock_receive;
|
|
pp->io.srcclock = (caddr_t)peer;
|
|
pp->io.datalen = 0;
|
|
pp->io.fd = fd;
|
|
if (!io_addclock(&pp->io)) {
|
|
(void) close(fd);
|
|
free(up);
|
|
return (0);
|
|
}
|
|
|
|
|
|
time(&now);
|
|
#ifdef GET_LOCALTIME
|
|
tm_time_p = localtime(&now);
|
|
#else
|
|
tm_time_p = gmtime(&now);
|
|
#endif
|
|
if (tm_time_p)
|
|
{
|
|
up->ymd = *tm_time_p;
|
|
}
|
|
else
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialize miscellaneous variables
|
|
*/
|
|
peer->precision = PRECISION;
|
|
pp->clockdesc = DESCRIPTION;
|
|
memcpy((char *)&pp->refid, REFID, 4);
|
|
return (1);
|
|
}
|
|
|
|
|
|
/*
|
|
* dumbclock_shutdown - shut down the clock
|
|
*/
|
|
static void
|
|
dumbclock_shutdown(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
register struct dumbclock_unit *up;
|
|
struct refclockproc *pp;
|
|
|
|
pp = peer->procptr;
|
|
up = (struct dumbclock_unit *)pp->unitptr;
|
|
io_closeclock(&pp->io);
|
|
free(up);
|
|
}
|
|
|
|
|
|
/*
|
|
* dumbclock_receive - receive data from the serial interface
|
|
*/
|
|
static void
|
|
dumbclock_receive(
|
|
struct recvbuf *rbufp
|
|
)
|
|
{
|
|
struct dumbclock_unit *up;
|
|
struct refclockproc *pp;
|
|
struct peer *peer;
|
|
|
|
l_fp trtmp; /* arrival timestamp */
|
|
int hours; /* hour-of-day */
|
|
int minutes; /* minutes-past-the-hour */
|
|
int seconds; /* seconds */
|
|
int temp; /* int temp */
|
|
int got_good; /* got a good time flag */
|
|
|
|
/*
|
|
* Initialize pointers and read the timecode and timestamp
|
|
*/
|
|
peer = (struct peer *)rbufp->recv_srcclock;
|
|
pp = peer->procptr;
|
|
up = (struct dumbclock_unit *)pp->unitptr;
|
|
temp = refclock_gtlin(rbufp, pp->a_lastcode, BMAX, &trtmp);
|
|
|
|
if (temp == 0) {
|
|
if (up->tcswitch == 0) {
|
|
up->tcswitch = 1;
|
|
up->laststamp = trtmp;
|
|
} else
|
|
up->tcswitch = 0;
|
|
return;
|
|
}
|
|
pp->lencode = (u_short)temp;
|
|
pp->lastrec = up->laststamp;
|
|
up->laststamp = trtmp;
|
|
up->tcswitch = 1;
|
|
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf("dumbclock: timecode %d %s\n",
|
|
pp->lencode, pp->a_lastcode);
|
|
#endif
|
|
|
|
/*
|
|
* We get down to business. Check the timecode format...
|
|
*/
|
|
got_good=0;
|
|
if (sscanf(pp->a_lastcode,"%02d:%02d:%02d",
|
|
&hours,&minutes,&seconds) == 3)
|
|
{
|
|
struct tm *gmtp;
|
|
struct tm *lt_p;
|
|
time_t asserted_time; /* the SPM time based on the composite time+date */
|
|
struct tm asserted_tm; /* the struct tm of the same */
|
|
int adjyear;
|
|
int adjmon;
|
|
int reality_delta;
|
|
time_t now;
|
|
|
|
|
|
/*
|
|
* Convert to GMT for sites that distribute localtime. This
|
|
* means we have to figure out what day it is. Easier said
|
|
* than done...
|
|
*/
|
|
|
|
asserted_tm.tm_year = up->ymd.tm_year;
|
|
asserted_tm.tm_mon = up->ymd.tm_mon;
|
|
asserted_tm.tm_mday = up->ymd.tm_mday;
|
|
asserted_tm.tm_hour = hours;
|
|
asserted_tm.tm_min = minutes;
|
|
asserted_tm.tm_sec = seconds;
|
|
asserted_tm.tm_isdst = -1;
|
|
|
|
#ifdef GET_LOCALTIME
|
|
asserted_time = mktime (&asserted_tm);
|
|
time(&now);
|
|
#else
|
|
#include "GMT unsupported for dumbclock!"
|
|
#endif
|
|
reality_delta = asserted_time - now;
|
|
|
|
/*
|
|
* We assume that if the time is grossly wrong, it's because we got the
|
|
* year/month/day wrong.
|
|
*/
|
|
if (reality_delta > INSANE_SECONDS)
|
|
{
|
|
asserted_time -= SECSPERDAY; /* local clock behind real time */
|
|
}
|
|
else if (-reality_delta > INSANE_SECONDS)
|
|
{
|
|
asserted_time += SECSPERDAY; /* local clock ahead of real time */
|
|
}
|
|
lt_p = localtime(&asserted_time);
|
|
if (lt_p)
|
|
{
|
|
up->ymd = *lt_p;
|
|
}
|
|
else
|
|
{
|
|
refclock_report (peer, CEVNT_FAULT);
|
|
return;
|
|
}
|
|
|
|
if ((gmtp = gmtime (&asserted_time)) == NULL)
|
|
{
|
|
refclock_report (peer, CEVNT_FAULT);
|
|
return;
|
|
}
|
|
adjyear = gmtp->tm_year+1900;
|
|
adjmon = gmtp->tm_mon+1;
|
|
pp->day = ymd2yd (adjyear, adjmon, gmtp->tm_mday);
|
|
pp->hour = gmtp->tm_hour;
|
|
pp->minute = gmtp->tm_min;
|
|
pp->second = gmtp->tm_sec;
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf ("time is %04d/%02d/%02d %02d:%02d:%02d UTC\n",
|
|
adjyear,adjmon,gmtp->tm_mday,pp->hour,pp->minute,
|
|
pp->second);
|
|
#endif
|
|
|
|
got_good=1;
|
|
}
|
|
|
|
if (!got_good)
|
|
{
|
|
if (up->linect > 0)
|
|
up->linect--;
|
|
else
|
|
refclock_report(peer, CEVNT_BADREPLY);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Process the new sample in the median filter and determine the
|
|
* timecode timestamp.
|
|
*/
|
|
if (!refclock_process(pp)) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
return;
|
|
}
|
|
pp->lastref = pp->lastrec;
|
|
refclock_receive(peer);
|
|
record_clock_stats(&peer->srcadr, pp->a_lastcode);
|
|
up->lasthour = (u_char)pp->hour;
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* dumbclock_poll - called by the transmit procedure
|
|
*/
|
|
static void
|
|
dumbclock_poll(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
register struct dumbclock_unit *up;
|
|
struct refclockproc *pp;
|
|
char pollchar;
|
|
|
|
/*
|
|
* Time to poll the clock. The Chrono-log clock is supposed to
|
|
* respond to a 'T' by returning a timecode in the format(s)
|
|
* specified above. Ours does (can?) not, but this seems to be
|
|
* an installation-specific problem. This code is dyked out,
|
|
* but may be re-enabled if anyone ever finds a Chrono-log that
|
|
* actually listens to this command.
|
|
*/
|
|
#if 0
|
|
pp = peer->procptr;
|
|
up = (struct dumbclock_unit *)pp->unitptr;
|
|
if (peer->reach == 0)
|
|
refclock_report(peer, CEVNT_TIMEOUT);
|
|
if (up->linect > 0)
|
|
pollchar = 'R';
|
|
else
|
|
pollchar = 'T';
|
|
if (write(pp->io.fd, &pollchar, 1) != 1)
|
|
refclock_report(peer, CEVNT_FAULT);
|
|
else
|
|
pp->polls++;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
int refclock_dumbclock_bs;
|
|
#endif /* REFCLOCK */
|