NetBSD/dist/ntp/ntpd/refclock_acts.c

987 lines
31 KiB
C

/* $NetBSD: refclock_acts.c,v 1.1.1.2 2000/04/22 14:53:24 simonb Exp $ */
/*
* refclock_acts - clock driver for the NIST/PTB Automated Computer Time
* Service aka Amalgamated Containerized Trash Service (ACTS)
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#if defined(REFCLOCK) && (defined(CLOCK_ACTS) || defined(CLOCK_PTBACTS))
#include <stdio.h>
#include <ctype.h>
#include <sys/time.h>
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif /* HAVE_SYS_IOCTL_H */
#include "ntpd.h"
#include "ntp_io.h"
#include "ntp_unixtime.h"
#include "ntp_refclock.h"
#include "ntp_stdlib.h"
#include "ntp_control.h"
/* MUST BE AFTER LAST #include <config.h> !!! */
#if defined(CLOCK_ACTS) && defined(CLOCK_PTBACTS)
# if defined(KEEPPTBACTS)
# undef CLOCK_ACTS
# else /* not KEEPPTBACTS */
# undef CLOCK_PTBACTS
# endif /* not KEEPPTBACTS */
#endif /* CLOCK_ACTS && CLOCK_PTBACTS */
/*
* This driver supports the NIST Automated Computer Time Service (ACTS).
* It periodically dials a prespecified telephone number, receives the
* NIST timecode data and calculates the local clock correction. It is
* designed primarily for use as a backup when neither a radio clock nor
* connectivity to Internet time servers is available. For the best
* accuracy, the individual telephone line/modem delay needs to be
* calibrated using outside sources.
*
* The ACTS is located at NIST Boulder, CO, telephone 303 494 4774. A
* toll call from a residence telephone in Newark, DE, costs between 14
* and 27 cents, depending on time of day, and from a campus telephone
* between 3 and 4 cents, although it is not clear what carrier and time
* of day discounts apply in this case. The modem dial string will
* differ depending on local telephone configuration, etc., and is
* specified by the phone command in the configuration file. The
* argument to this command is an AT command for a Hayes compatible
* modem.
*
* The accuracy produced by this driver should be in the range of a
* millisecond or two, but may need correction due to the delay
* characteristics of the individual modem involved. For undetermined
* reasons, some modems work with the ACTS echo-delay measurement scheme
* and some don't. This driver tries to do the best it can with what it
* gets. Initial experiments with a Practical Peripherals 9600SA modem
* here in Delaware suggest an accuracy of a millisecond or two can be
* achieved without the scheme by using a fudge time1 value of 65.0 ms.
* In either case, the dispersion for a single call involving ten
* samples is about 1.3 ms.
*
* The driver can operate in either of three modes, as determined by
* the mode parameter in the server configuration command. In mode 0
* (automatic) the driver operates continuously at intervals depending
* on the prediction error, as measured by the driver, usually in the
* order of several hours. In mode 1 (backup) the driver is enabled in
* automatic mode only when no other source of synchronization is
* available and when more than MAXOUTAGE (3600 s) have elapsed since
* last synchronized by other sources. In mode 2 (manual) the driver
* operates only when enabled using a fudge flags switch, as described
* below.
*
* For reliable call management, this driver requires a 1200-bps modem
* with a Hayes-compatible command set and control over the modem data
* terminal ready (DTR) control line. Present restrictions require the
* use of a POSIX-compatible programming interface, although other
* interfaces may work as well. The modem setup string is hard-coded in
* the driver and may require changes for nonstandard modems or special
* circumstances.
*
* Further information can be found in the README.refclock file in the
* ntp - Version 3 distribution.
*
* Fudge Factors
*
* Ordinarily, the propagation time correction is computed automatically
* by ACTS and the driver. When this is not possible or erratic due to
* individual modem characteristics, the fudge flag2 switch should be
* set to disable the ACTS echo-delay scheme. In any case, the fudge
* time1 parameter can be used to adjust the propagation delay as
* required.
*
* The ACTS call interval is determined in one of three ways. In manual
* mode a call is initiated by setting fudge flag1 using ntpdc, either
* manually or via a cron job. In AUTO mode this flag is set by the peer
* timer, which is controlled by the sys_poll variable in response to
* measured errors. In backup mode the driver is ordinarily asleep, but
* awakes (in auto mode) if all other synchronization sources are lost.
* In either auto or backup modes, the call interval increases as long
* as the measured errors do not exceed the value of the fudge time2
* parameter.
*
* When the fudge flag1 is set, the ACTS calling program is activated.
* This program dials each number listed in the phones command of the
* configuration file in turn. If a call attempt fails, the next number
* in the list is dialed. The fudge flag1 and counter are reset and the
* calling program terminated if (a) a valid clock update has been
* determined, (b) no more numbers remain in the list, (c) a device
* fault or timeout occurs or (d) fudge flag1 is reset manually using
* ntpdc.
*
* In automatic and backup modes, the driver determines the call
* interval using a procedure depending on the measured prediction
* error and the fudge time2 parameter. If the error exceeds time2 for a
* number of times depending on the current interval, the interval is
* decreased, but not less than about 1000 s. If the error is less than
* time2 for some number of times, the interval is increased, but not
* more than about 18 h. With the default value of zero for fudge time2,
* the interval will increase from 1000 s to the 4000-8000-s range, in
* which the expected accuracy should be in the 1-2-ms range. Setting
* fudge time2 to a large value, like 0.1 s, may result in errors of
* that order, but increase the call interval to the maximum. The exact
* value for each configuration will depend on the modem and operating
* system involved, so some experimentation may be necessary.
*/
/*
* DESCRIPTION OF THE AUTOMATED COMPUTER TELEPHONE SERVICE (ACTS)
* (reformatted from ACTS on-line computer help information)
*
* The following is transmitted (at 1200 baud) following completion of
* the telephone connection.
*
* National Institute of Standards and Technology
* Telephone Time Service, Generator 3B
* Enter question mark "?" for HELP
* D L D
* MJD YR MO DA H M S ST S UT1 msADV <OTM>
* 47999 90-04-18 21:39:15 50 0 +.1 045.0 UTC(NIST) *
* 47999 90-04-18 21:39:16 50 0 +.1 045.0 UTC(NIST) *
* 47999 90-04-18 21:39:17 50 0 +.1 045.0 UTC(NIST) *
* 47999 90-04-18 21:39:18 50 0 +.1 045.0 UTC(NIST) *
* 47999 90-04-18 21:39:19 50 0 +.1 037.6 UTC(NIST) #
* 47999 90-04-18 21:39:20 50 0 +.1 037.6 UTC(NIST) #
* etc..etc...etc.......
*
* UTC = Universal Time Coordinated, the official world time referred to
* the zero meridian.
*
* DST Daylight savings time characters, valid for the continental
* U.S., are set as follows:
*
* 00 We are on standard time (ST).
* 01-49 Now on DST, go to ST when your local time is 2:00 am and
* the count is 01. The count is decremented daily at 00
* (UTC).
* 50 We are on DST.
* 51-99 Now on ST, go to DST when your local time is 2:00 am and
* the count is 51. The count is decremented daily at 00
* (UTC).
*
* The two DST characters provide up to 48 days advance notice of a
* change in time. The count remains at 00 or 50 at other times.
*
* LS Leap second flag is set to "1" to indicate that a leap second is
* to be added as 23:59:60 (UTC) on the last day of the current UTC
* month. The LS flag will be reset to "0" starting with 23:59:60
* (UTC). The flag will remain on for the entire month before the
* second is added. Leap seconds are added as needed at the end of
* any month. Usually June and/or December are chosen.
*
* The leap second flag will be set to a "2" to indicate that a
* leap second is to be deleted at 23:59:58--00:00:00 on the last
* day of the current month. (This latter provision is included per
* international recommendation, however it is not likely to be
* required in the near future.)
*
* DUT1 Approximate difference between earth rotation time (UT1) and
* UTC, in steps of 0.1 second: DUT1 = UT1 - UTC.
*
* MJD Modified Julian Date, often used to tag certain scientific data.
*
* The full time format is sent at 1200 baud, 8 bit, 1 stop, no parity.
* The format at 300 Baud is also 8 bit, 1 stop, no parity. At 300 Baud
* the MJD and DUT1 values are deleted and the time is transmitted only
* on even seconds.
*
* Maximum on line time will be 56 seconds. If all lines are busy at any
* time, the oldest call will be terminated if it has been on line more
* than 28 seconds, otherwise, the call that first reaches 28 seconds
* will be terminated.
*
* Current time is valid at the "on-time" marker (OTM), either "*" or
* "#". The nominal on-time marker (*) will be transmitted 45 ms early
* to account for the 8 ms required to send 1 character at 1200 Baud,
* plus an additional 7 ms for delay from NIST to the user, and
* approximately 30 ms "scrambler" delay inherent in 1200 Baud modems.
* If the caller echoes all characters, NIST will measure the round trip
* delay and advance the on-time marker so that the midpoint of the stop
* bit arrives at the user on time. The amount of msADV will reflect the
* actual required advance in milliseconds and the OTM will be a "#".
*
* (The NIST system requires 4 or 5 consecutive delay measurements which
* are consistent before switching from "*" to "#". If the user has a
* 1200 Baud modem with the same internal delay as that used by NIST,
* then the "#" OTM should arrive at the user within +-2 ms of the
* correct time.
*
* However, NIST has studied different brands of 1200 Baud modems and
* found internal delays from 24 ms to 40 ms and offsets of the "#" OTM
* of +-10 ms. For many computer users, +-10 ms accuracy should be more
* than adequate since many computer internal clocks can only be set
* with granularity of 20 to 50 ms. In any case, the repeatability of
* the offset for the "#" OTM should be within +-2 ms, if the dial-up
* path is reciprocal and the user doesn't change the brand or model of
* modem used.
*
* This should be true even if the dial-up path on one day is a land-
* line of less than 40 ms (one way) and on the next day is a satellite
* link of 260 to 300 ms. In the rare event that the path is one way by
* satellite and the other way by land line with a round trip
* measurement in the range of 90 to 260 ms, the OTM will remain a "*"
* indicating 45 ms advance.
*
* For user comments write:
* NIST-ACTS
* Time and Frequency Division
* Mail Stop 847
* 325 Broadway
* Boulder, CO 80303
*
* Software for setting (PC)DOS compatable machines is available on a
* 360-kbyte diskette for $35.00 from: NIST Office of Standard Reference
* Materials B311-Chemistry Bldg, NIST, Gaithersburg, MD, 20899, (301)
* 975-6776
*
* PTB timecode service (+49 531 512038)
* The Physikalisch-Technische Bundesanstalt (Germany)
* also supports a modem time service
* as the data formats are very similar this driver can also be compiled for
* utilizing the PTB time code service.
*
* Data format
* 0000000000111111111122222222223333333333444444444455555555556666666666777777777 7
* 0123456789012345678901234567890123456789012345678901234567890123456789012345678 9
* 1995-01-23 20:58:51 MEZ 10402303260219950123195849740+40000500 *
* A B C D EF G H IJ K L M N O P Q R S T U V W XY Z<CR><LF>
*
* A year
* B month
* C day
* D hour
* E : normally
* A for DST to ST switch first hour
* B for DST to ST switch second hour if not marked in H
* F minute
* G second
* H timezone
* I day of week
* J week of year
* K day of year
* L month for next ST/DST changes
* M day
* N hour
* O UTC year
* P UTC month
* Q UTC day
* R UTC hour
* S UTC minute
* T modified julian day (MJD)
* U DUT1
* V direction and month if leap second
* W signal delay (assumed/measured)
* X sequence number for additional text line in Y
* Y additional text
* Z on time marker (* - assumed delay / # measured delay)
* <CR>!<LF> ! is second change !
*
* This format is also used by the National Physical Laboratory (NPL)'s
* TRUETIME service in the UK. In this case the timezone field is
* UTC+0 or UTC+1 for standard and daylight saving time. The phone
* number for this service (a premium rate number) is 0891 516 333.
* It is not clear whether the echo check is implemented.
*
* For more detail, see http://www.npl.co.uk/npl/cetm/taf/truetime.html.
*/
/*
* Interface definitions
*/
#define SPEED232 B1200 /* uart speed (1200 cowardly baud) */
#define PRECISION (-10) /* precision assumed (about 1 ms) */
#ifdef CLOCK_ACTS
# define REFID "ACTS" /* reference ID */
# define DESCRIPTION "NIST Automated Computer Time Service" /* WRU */
# define LENCODE 50 /* length of valid timecode string */
# define DEVICE "/dev/acts%d" /* device name and unit */
# define REF_ENTRY refclock_acts
#else /* not CLOCK_ACTS */
# define REFID "TPTB" /* reference ID */
# define DESCRIPTION "PTB Automated Computer Time Service"
# define LENCODE 78 /* length of valid timecode string */
# define DEVICE "/dev/ptb%d" /* device name and unit */
# define REF_ENTRY refclock_ptb
#endif /* not CLOCK_ACTS */
#define MODE_AUTO 0 /* automatic mode */
#define MODE_BACKUP 1 /* backup mode */
#define MODE_MANUAL 2 /* manual mode */
#define MSGCNT 10 /* we need this many ACTS messages */
#define SMAX 80 /* max token string length */
#define ACTS_MINPOLL 10 /* log2 min poll interval (1024 s) */
#define ACTS_MAXPOLL 18 /* log2 max poll interval (16384 s) */
#define MAXOUTAGE 3600 /* max before ACTS kicks in (s) */
/*
* Modem control strings. These may have to be changed for some modems.
*
* AT command prefix
* B1 initiate call negotiation using Bell 212A
* &C1 enable carrier detect
* &D2 hang up and return to command mode on DTR transition
* E0 modem command echo disabled
* l1 set modem speaker volume to low level
* M1 speaker enabled untill carrier detect
* Q0 return result codes
* V1 return result codes as English words
*/
#define MODEM_SETUP "ATB1&C1&D2E0L1M1Q0V1" /* modem setup */
#define MODEM_HANGUP "ATH" /* modem disconnect */
/*
* Timeouts
*/
#define IDLE 60 /* idle timeout (s) */
#define WAIT 2 /* wait timeout (s) */
#define ANSWER 30 /* answer timeout (s) */
#define CONNECT 10 /* connect timeout (s) */
#define TIMECODE 15 /* timecode timeout (s) */
/*
* Tables to compute the ddd of year form icky dd/mm timecode. Viva la
* leap.
*/
static int day1tab[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
static int day2tab[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
/*
* Unit control structure
*/
struct actsunit {
int pollcnt; /* poll message counter */
int state; /* the first one was Delaware */
int run; /* call program run switch */
int msgcnt; /* count of ACTS messages received */
long redial; /* interval to next automatic call */
double msADV; /* millisecond advance of last message */
};
/*
* Function prototypes
*/
static int acts_start P((int, struct peer *));
static void acts_shutdown P((int, struct peer *));
static void acts_receive P((struct recvbuf *));
static void acts_poll P((int, struct peer *));
static void acts_timeout P((struct peer *));
static void acts_disc P((struct peer *));
static int acts_write P((struct peer *, const char *));
/*
* Transfer vector (conditional structure name)
*/
struct refclock REF_ENTRY = {
acts_start, /* start up driver */
acts_shutdown, /* shut down driver */
acts_poll, /* transmit poll message */
noentry, /* not used (old acts_control) */
noentry, /* not used (old acts_init) */
noentry, /* not used (old acts_buginfo) */
NOFLAGS /* not used */
};
/*
* acts_start - open the devices and initialize data for processing
*/
static int
acts_start (
int unit,
struct peer *peer
)
{
register struct actsunit *up;
struct refclockproc *pp;
int fd;
char device[20];
int dtr = TIOCM_DTR;
/*
* Open serial port. Use ACTS line discipline, if available. It
* pumps a timestamp into the data stream at every on-time
* character '*' found. Note: the port must have modem control
* or deep pockets for the phone bill. HP-UX 9.03 users should
* have very deep pockets.
*/
(void)sprintf(device, DEVICE, unit);
if (!(fd = refclock_open(device, SPEED232, LDISC_ACTS)))
return (0);
if (ioctl(fd, TIOCMBIS, (char *)&dtr) < 0) {
msyslog(LOG_ERR, "clock %s ACTS no modem control",
ntoa(&peer->srcadr));
return (0);
}
/*
* Allocate and initialize unit structure
*/
if (!(up = (struct actsunit *)
emalloc(sizeof(struct actsunit)))) {
(void) close(fd);
return (0);
}
memset((char *)up, 0, sizeof(struct actsunit));
pp = peer->procptr;
pp->io.clock_recv = acts_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);
}
pp->unitptr = (caddr_t)up;
/*
* Initialize miscellaneous variables
*/
peer->precision = PRECISION;
pp->clockdesc = DESCRIPTION;
memcpy((char *)&pp->refid, REFID, 4);
peer->minpoll = ACTS_MINPOLL;
peer->maxpoll = ACTS_MAXPOLL;
peer->sstclktype = CTL_SST_TS_TELEPHONE;
/*
* Initialize modem and kill DTR. We skedaddle if this comes
* bum.
*/
if (!acts_write(peer, MODEM_SETUP)) {
(void) close(fd);
free(up);
return (0);
}
/*
* Set up the driver timeout
*/
peer->nextdate = current_time + WAIT;
return (1);
}
/*
* acts_shutdown - shut down the clock
*/
static void
acts_shutdown (
int unit,
struct peer *peer
)
{
register struct actsunit *up;
struct refclockproc *pp;
pp = peer->procptr;
up = (struct actsunit *)pp->unitptr;
io_closeclock(&pp->io);
free(up);
}
/*
* acts_receive - receive data from the serial interface
*/
static void
acts_receive (
struct recvbuf *rbufp
)
{
register struct actsunit *up;
struct refclockproc *pp;
struct peer *peer;
char str[SMAX];
int i;
char hangup = '%'; /* ACTS hangup */
int day; /* day of the month */
int month; /* month of the year */
u_long mjd; /* Modified Julian Day */
double dut1; /* DUT adjustment */
double msADV; /* ACTS transmit advance (ms) */
char flag; /* calibration flag */
#ifndef CLOCK_PTBACTS
char utc[10]; /* this is NIST and you're not */
u_int dst; /* daylight/standard time indicator */
u_int leap; /* leap-second indicator */
#else
char leapdir; /* leap direction */
u_int leapmonth; /* month of leap */
#endif
/*
* Initialize pointers and read the timecode and timestamp. If
* the OK modem status code, leave it where folks can find it.
*/
peer = (struct peer *)rbufp->recv_srcclock;
pp = peer->procptr;
up = (struct actsunit *)pp->unitptr;
pp->lencode = refclock_gtlin(rbufp, pp->a_lastcode, BMAX,
&pp->lastrec);
if (pp->lencode == 0) {
if (strcmp(pp->a_lastcode, "OK") == 0)
pp->lencode = 2;
return;
}
#ifdef DEBUG
if (debug)
printf("acts: state %d timecode %d %*s\n", up->state,
pp->lencode, pp->lencode, pp->a_lastcode);
#endif
switch (up->state) {
case 0:
/*
* State 0. We are not expecting anything. Probably
* modem disconnect noise. Go back to sleep.
*/
return;
case 1:
/*
* State 1. We are waiting for the call to be answered.
* All we care about here is CONNECT as the first token
* in the string. If the modem signals BUSY, ERROR, NO
* ANSWER, NO CARRIER or NO DIALTONE, we immediately
* hang up the phone. If CONNECT doesn't happen after
* ANSWER seconds, hang up the phone. If everything is
* okay, start the connect timeout and slide into state
* 2.
*/
if( strcmp(pp->a_lastcode, " ") == 0) {
acts_disc(peer);
return;
}
if( strcmp(sys_phone[0],"DIRECT") != 0 ) {
(void)strncpy(str, strtok(pp->a_lastcode, " "), SMAX);
if (strcmp(str, "BUSY") == 0 || strcmp(str, "ERROR") ==
0 || strcmp(str, "NO") == 0) {
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE,
"clock %s ACTS modem status %s",
ntoa(&peer->srcadr), pp->a_lastcode);
acts_disc(peer);
} else if (strcmp(str, "CONNECT") == 0) {
peer->nextdate = current_time + CONNECT;
up->msgcnt = 0;
up->state++;
}
} else {
(void) strncpy(str,"CONNECT",7);
peer->nextdate = current_time + CONNECT;
up->msgcnt = 0;
up->state++;
}
return;
case 2:
/*
* State 2. The call has been answered and we are
* waiting for the first ACTS message. If this doesn't
* happen within the timecode timeout, hang up the
* phone. We probably got a wrong number or ACTS is
* down.
*/
peer->nextdate = current_time + TIMECODE;
up->state++;
}
/*
* Real yucky things here. Ignore everything except timecode
* messages, as determined by the message length. We told the
* terminal routines to end the line with '*' and the line
* discipline to strike a timestamp on that character. However,
* when the ACTS echo-delay scheme works, the '*' eventually
* becomes a '#'. In this case the message is ended by the <CR>
* that comes about 200 ms after the '#' and the '#' cannot be
* echoed at the proper time. But, this may not be a lose, since
* we already have good data from prior messages and only need
* the millisecond advance calculated by ACTS. So, if the
* message is long enough and has an on-time character at the
* right place, we consider the message (but not neccesarily the
* timestmap) to be valid.
*/
if (pp->lencode != LENCODE)
return;
#ifndef CLOCK_PTBACTS
/*
* We apparently have a valid timecode message, so dismember it
* with sscan(). This routine does a good job in spotting syntax
* errors without becoming overly pedantic.
*
* D L D
* MJD YR MO DA H M S ST S UT1 msADV OTM
* 47222 88-03-02 21:39:15 83 0 +.3 045.0 UTC(NBS) *
*/
if (sscanf(pp->a_lastcode,
"%5ld %2d-%2d-%2d %2d:%2d:%2d %2d %1d %3lf %5lf %s %c",
&mjd, &pp->year, &month, &day, &pp->hour, &pp->minute,
&pp->second, &dst, &leap, &dut1, &msADV, utc, &flag) != 13) {
refclock_report(peer, CEVNT_BADREPLY);
return;
}
#else
/*
* Data format
* 0000000000111111111122222222223333333333444444444455555555556666666666777777777 7
* 0123456789012345678901234567890123456789012345678901234567890123456789012345678 9
* 1995-01-23 20:58:51 MEZ 10402303260219950123195849740+40000500 *
*/
if (sscanf(pp->a_lastcode,
"%*4d-%*2d-%*2d %*2d:%*2d:%2d %*5c%*12c%4d%2d%2d%2d%2d%5ld%2lf%c%2d%3lf%*15c%c",
&pp->second, &pp->year, &month, &day, &pp->hour, &pp->minute, &mjd, &dut1, &leapdir, &leapmonth, &msADV, &flag) != 12) {
refclock_report(peer, CEVNT_BADREPLY);
return;
}
#endif
/*
* Some modems can't be trusted (the Practical Peripherals
* 9600SA comes to mind) and, even if they manage to unstick
* ACTS, the millisecond advance is wrong, so we use CLK_FLAG2
* to disable echoes, if neccessary.
*/
if ((flag == '*' || flag == '#') && !(pp->sloppyclockflag &
CLK_FLAG2))
(void)write(pp->io.fd, &flag, 1);
/*
* The ACTS timecode format croaks in 2000. Life is short.
* Would only the timecode mavens resist the urge to express months
* of the year and days of the month in favor of days of the year.
*/
if (month < 1 || month > 12 || day < 1) {
refclock_report(peer, CEVNT_BADTIME);
return;
}
/*
* Depending on the driver, at this point we have a two-digit year
* or a four-digit year. Make sure we have a four-digit year.
*/
if ( pp->year < YEAR_PIVOT ) pp->year += 100; /* Y2KFixes */
if ( pp->year < YEAR_BREAK ) pp->year += 1900; /* Y2KFixes */
if ( !isleap_4(pp->year) ) { /* Y2KFixes */
if (day > day1tab[month - 1]) {
refclock_report(peer, CEVNT_BADTIME);
return;
}
for (i = 0; i < month - 1; i++)
day += day1tab[i];
} else {
if (day > day2tab[month - 1]) {
refclock_report(peer, CEVNT_BADTIME);
return;
}
for (i = 0; i < month - 1; i++)
day += day2tab[i];
}
pp->day = day;
#ifndef CLOCK_PTBACTS
if (leap == 1)
pp->leap = LEAP_ADDSECOND;
else if (pp->leap == 2)
pp->leap = LEAP_DELSECOND;
#else
if (leapmonth == month) {
if (leapdir == '+')
pp->leap = LEAP_ADDSECOND;
else if (leapdir == '-')
pp->leap = LEAP_DELSECOND;
}
#endif
/*
* Colossal hack here. We process each sample in a trimmed-mean
* filter and determine the reference clock offset and
* dispersion. The fudge time1 value is added to each sample as
* received. If we collect MSGCNT samples before the '#' on-time
* character, we use the results of the filter as is. If the '#'
* is found before that, the adjusted msADV is used to correct
* the propagation delay.
*/
up->msgcnt++;
if (flag == '#') {
pp->offset += (msADV - up->msADV) * 1000 * 1e-6;
} else {
up->msADV = msADV;
if (!refclock_process(pp)) {
refclock_report(peer, CEVNT_BADTIME);
return;
} else if (up->msgcnt < MSGCNT)
return;
}
/*
* We have a filtered sample offset ready for peer processing.
* We use lastrec as both the reference time and receive time in
* order to avoid being cute, like setting the reference time
* later than the receive time, which may cause a paranoid
* protocol module to chuck out the data. Finaly, we unhook the
* timeout, arm for the next call, fold the tent and go home.
* The little dance with the '%' character is an undocumented
* ACTS feature that hangs up the phone real quick without
* waiting for carrier loss or long-space disconnect, but we do
* these clumsy things anyway.
*/
record_clock_stats(&peer->srcadr, pp->a_lastcode);
refclock_receive(peer);
pp->sloppyclockflag &= ~CLK_FLAG1;
up->pollcnt = 0;
(void)write(pp->io.fd, &hangup, 1);
up->state = 0;
acts_disc(peer);
}
/*
* acts_poll - called by the transmit routine
*/
static void
acts_poll (
int unit,
struct peer *peer
)
{
register struct actsunit *up;
struct refclockproc *pp;
/*
* If the driver is running, we set the enable flag (fudge
* flag1), which causes the driver timeout routine to initiate a
* call to ACTS. If not, the enable flag can be set using
* ntpdc. If this is the sustem peer, then follow the system
* poll interval.
*/
pp = peer->procptr;
up = (struct actsunit *)pp->unitptr;
if (up->run) {
pp->sloppyclockflag |= CLK_FLAG1;
if (peer == sys_peer)
peer->hpoll = sys_poll;
else
peer->hpoll = peer->minpoll;
}
acts_timeout (peer);
return;
}
/*
* acts_timeout - called by the timer interrupt
*/
static void
acts_timeout (
struct peer *peer
)
{
register struct actsunit *up;
struct refclockproc *pp;
int dtr = TIOCM_DTR;
/*
* If a timeout occurs in other than state 0, the call has
* failed. If in state 0, we just see if there is other work to
* do.
*/
pp = peer->procptr;
up = (struct actsunit *)pp->unitptr;
if (up->state) {
acts_disc(peer);
return;
}
switch (peer->ttl) {
/*
* In manual mode the ACTS calling program is activated
* by the ntpdc program using the enable flag (fudge
* flag1), either manually or by a cron job.
*/
case MODE_MANUAL:
up->run = 0;
break;
/*
* In automatic mode the ACTS calling program runs
* continuously at intervals determined by the sys_poll
* variable.
*/
case MODE_AUTO:
if (!up->run)
pp->sloppyclockflag |= CLK_FLAG1;
up->run = 1;
break;
/*
* In backup mode the ACTS calling program is disabled,
* unless no system peer has been selected for MAXOUTAGE
* (3600 s). Once enabled, it runs until some other NTP
* peer shows up.
*/
case MODE_BACKUP:
if (!up->run && sys_peer == 0) {
if (current_time - last_time > MAXOUTAGE) {
up->run = 1;
peer->hpoll = peer->minpoll;
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE,
"clock %s ACTS backup started ",
ntoa(&peer->srcadr));
}
} else if (up->run && sys_peer->sstclktype != CTL_SST_TS_TELEPHONE) {
peer->hpoll = peer->minpoll;
up->run = 0;
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE,
"clock %s ACTS backup stopped",
ntoa(&peer->srcadr));
}
break;
default:
msyslog(LOG_ERR,
"clock %s ACTS invalid mode", ntoa(&peer->srcadr));
}
/*
* The fudge flag1 is used as an enable/disable; if set either
* by the code or via ntpdc, the ACTS calling program is
* started; if reset, the phones stop ringing.
*/
if (!(pp->sloppyclockflag & CLK_FLAG1)) {
up->pollcnt = 0;
peer->nextdate = current_time + IDLE;
return;
}
/*
* Initiate a call to the ACTS service. If we wind up here in
* other than state 0, a successful call could not be completed
* within minpoll seconds. We advance to the next modem dial
* string. If none are left, we log a notice and clear the
* enable flag. For future enhancement: call the site RP and
* leave an obscene message in his voicemail.
*/
if (sys_phone[up->pollcnt][0] == '\0') {
refclock_report(peer, CEVNT_TIMEOUT);
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE,
"clock %s ACTS calling program terminated",
ntoa(&peer->srcadr));
pp->sloppyclockflag &= ~CLK_FLAG1;
#ifdef DEBUG
if (debug)
printf("acts: calling program terminated\n");
#endif
up->pollcnt = 0;
peer->nextdate = current_time + IDLE;
return;
}
/*
* Raise DTR, call ACTS and start the answer timeout. We think
* it strange if the OK status has not been received from the
* modem, but plow ahead anyway.
*/
if (strcmp(pp->a_lastcode, "OK") != 0)
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE, "clock %s ACTS no modem status",
ntoa(&peer->srcadr));
(void)ioctl(pp->io.fd, TIOCMBIS, (char *)&dtr);
(void)acts_write(peer, sys_phone[up->pollcnt]);
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE, "clock %s ACTS calling %s\n",
ntoa(&peer->srcadr), sys_phone[up->pollcnt]);
up->state = 1;
up->pollcnt++;
pp->polls++;
peer->nextdate = current_time + ANSWER;
return;
}
/*
* acts_disc - disconnect the call and wait for the ruckus to cool
*/
static void
acts_disc (
struct peer *peer
)
{
register struct actsunit *up;
struct refclockproc *pp;
int dtr = TIOCM_DTR;
/*
* We should never get here other than in state 0, unless a call
* has timed out. We drop DTR, which will reliably get the modem
* off the air, even while ACTS is hammering away full tilt.
*/
pp = peer->procptr;
up = (struct actsunit *)pp->unitptr;
(void)ioctl(pp->io.fd, TIOCMBIC, (char *)&dtr);
if (up->state > 0) {
NLOG(NLOG_CLOCKINFO) /* conditional if clause for conditional syslog */
msyslog(LOG_NOTICE, "clock %s ACTS call failed %d",
ntoa(&peer->srcadr), up->state);
#ifdef DEBUG
if (debug)
printf("acts: call failed %d\n", up->state);
#endif
up->state = 0;
}
peer->nextdate = current_time + WAIT;
}
/*
* acts_write - write a message to the serial port
*/
static int
acts_write (
struct peer *peer,
const char *str
)
{
register struct actsunit *up;
struct refclockproc *pp;
int len;
int code;
char cr = '\r';
/*
* Not much to do here, other than send the message, handle
* debug and report faults.
*/
pp = peer->procptr;
up = (struct actsunit *)pp->unitptr;
len = strlen(str);
#ifdef DEBUG
if (debug)
printf("acts: state %d send %d %s\n", up->state, len,
str);
#endif
code = write(pp->io.fd, str, (unsigned)len) == len;
code &= write(pp->io.fd, &cr, 1) == 1;
if (!code)
refclock_report(peer, CEVNT_FAULT);
return (code);
}
#else
int refclock_acts_bs;
#endif /* REFCLOCK */