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