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# Australia / Newcastle
# T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
# SBS
T 599500000 7MHz 2/3 NONE QAM64 8k 1/8 NONE
# NBN
T 585500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
# Prime
T 704500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
# ABC
T 592500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
# SC10
T 690500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
#n183'>183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
/*

   dvbdate - a program to set the system date and time from a TDT multiplex

   Copyright (C) Laurence Culhane 2002 <dvbdate@holmes.demon.co.uk>

   Mercilessly ripped off from dvbtune, Copyright (C) Dave Chapman 2001

   Revamped by Johannes Stezenbach <js@convergence.de>
   and Michael Hunold <hunold@convergence.de>
  
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   Or, point your browser to http://www.gnu.org/copyleft/gpl.html

   Copyright (C) Laurence Culhane 2002 <dvbdate@holmes.demon.co.uk>

*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <errno.h>
#include <getopt.h>
#include <stdarg.h>

#include <linux/dvb/dmx.h>

#define bcdtoint(i) ((((i & 0xf0) >> 4) * 10) + (i & 0x0f))

/* How many seconds can the system clock be out before we get warned? */
#define ALLOWABLE_DELTA 30*60

char *ProgName;
int do_print;
int do_set;
int do_force;
int do_quiet;
int timeout = 25;

void errmsg(char *message, ...)
{
	va_list ap;

	va_start(ap, message);
	fprintf(stderr, "%s: ", ProgName);
	vfprintf(stderr, message, ap);
	va_end(ap);
}

void usage()
{
	fprintf(stderr, "usage: %s [-p] [-s] [-f] [-q] [-h]\n", ProgName);
	_exit(1);
}

void help()
{
	fprintf(stderr, "\nhelp:\n" "%s [-p] [-s] [-f] [-q] [-h] [-t n]\n" "  --print	(print current time, TDT time and delta)\n" "  --set	(set the system clock to TDT time)\n" "  --force	(force the setting of the clock)\n" "  --quiet	(be silent)\n" "  --help	(display this message)\n""  --timout n	(max seconds to wait, default: 25)\n", ProgName);
	_exit(1);
}

int do_options(int arg_count, char **arg_strings)
{
	static struct option Long_Options[] = {
		{"print", 0, 0, 'p'},
		{"set", 0, 0, 's'},
		{"force", 0, 0, 'f'},
		{"quiet", 0, 0, 'q'},
		{"help", 0, 0, 'h'},
		{"timeout", 1, 0, 't'},
		{0, 0, 0, 0}
	};
	int c;
	int Option_Index = 0;

	while (1) {
		c = getopt_long(arg_count, arg_strings, "psfqht:", Long_Options, &Option_Index);
		if (c == EOF)
			break;
		switch (c) {
		case 't':
			timeout = atoi(optarg);
			if (0 == timeout) {
				fprintf(stderr, "%s: invalid timeout value\n", ProgName);
				usage();
			}
			break;
		case 'p':
			do_print = 1;
			break;
		case 's':
			do_set = 1;
			break;
		case 'f':
			do_force = 1;
			break;
		case 'q':
			do_quiet = 1;
			break;
		case 'h':
			help();
			break;
		case '?':
			usage();
			break;
		case 0:
/*
 * Which long option has been selected?  We only need this extra switch
 * to cope with the case of wanting to assign two long options the same
 * short character code.
 */
			printf("long option index %d\n", Option_Index);
			switch (Option_Index) {
			case 0:	/* Print */
			case 1:	/* Set */
			case 2:	/* Force */
			case 3:	/* Quiet */
			case 4:	/* Help */
			case 5:	/* timout */
				break;
			default:
				fprintf(stderr, "%s: unknown long option %d\n", ProgName, Option_Index);
				usage();
			}
			break;
/*
 * End of Special Long-opt handling code
 */
		default:
			fprintf(stderr, "%s: unknown getopt error - returned code %02x\n", ProgName, c);
			_exit(1);
		}
	}
	return 0;
}

/*
 * return the TDT time in UNIX time_t format
 */

time_t convert_date(char *dvb_buf)
{
	int i;
	int year, month, day, hour, min, sec;
	long int mjd;
	struct tm dvb_time;

	mjd = (dvb_buf[0] & 0xff) << 8;
	mjd += (dvb_buf[1] & 0xff);
	hour = bcdtoint(dvb_buf[2] & 0xff);
	min = bcdtoint(dvb_buf[3] & 0xff);
	sec = bcdtoint(dvb_buf[4] & 0xff);
/*
 * Use the routine specified in ETSI EN 300 468 V1.4.1,
 * "Specification for Service Information in Digital Video Broadcasting"
 * to convert from Modified Julian Date to Year, Month, Day.
 */
	year = (int) ((mjd - 15078.2) / 365.25);
	month = (int) ((mjd - 14956.1 - (int) (year * 365.25)) / 30.6001);
	day = mjd - 14956 - (int) (year * 365.25) - (int) (month * 30.6001);
	if (month == 14 || month == 15)
		i = 1;
	else
		i = 0;
	year += i;
	month = month - 1 - i * 12;

	dvb_time.tm_sec = sec;
	dvb_time.tm_min = min;
	dvb_time.tm_hour = hour;
	dvb_time.tm_mday = day;
	dvb_time.tm_mon = month - 1;
	dvb_time.tm_year = year;
	dvb_time.tm_isdst = -1;
	dvb_time.tm_wday = 0;
	dvb_time.tm_yday = 0;
	return (timegm(&dvb_time));
}


/*
 * Get the next UTC date packet from the TDT multiplex
 */

int scan_date(time_t *dvb_time, unsigned int to)
{
	int fd_date;
	int n, seclen;
	time_t t;
	unsigned char buf[4096];
	struct dmx_sct_filter_params sctFilterParams;
	struct pollfd ufd;
	int found = 0;
	
	t = 0;
	if ((fd_date = open("/dev/dvb/adapter0/demux0", O_RDWR | O_NONBLOCK)) < 0) {
		perror("fd_date DEVICE: ");
		return -1;
	}

	memset(&sctFilterParams, 0, sizeof(sctFilterParams));
	sctFilterParams.pid = 0x14;
	sctFilterParams.timeout = 0;
	sctFilterParams.flags = DMX_IMMEDIATE_START;
	sctFilterParams.filter.filter[0] = 0x70;
	sctFilterParams.filter.mask[0] = 0xff;

	if (ioctl(fd_date, DMX_SET_FILTER, &sctFilterParams) < 0) {
		perror("DATE - DMX_SET_FILTER:");
		close(fd_date);
		return -1;
	}

	while (to > 0) {
		int res;

		memset(&ufd,0,sizeof(ufd));
		ufd.fd=fd_date;
		ufd.events=POLLIN;

		res = poll(&ufd,1,1000);
		if (0 == res) {
			fprintf(stdout, ".");
			fflush(stdout);
			to--;
			continue;
  		}
		if (1 == res) {
			found = 1;
			break;
		}
		errmsg("error polling for data");
		close(fd_date);
		return -1;
	}
	fprintf(stdout, "\n");
	if (0 == found) {
		errmsg("timeout - try tuning to a multiplex?\n");
		close(fd_date);
		return -1;
	}

	if ((n = read(fd_date, buf, 4096)) >= 3) {
		seclen = ((buf[1] & 0x0f) << 8) | (buf[2] & 0xff);
		if (n == seclen + 3) {
			t = convert_date(&(buf[3]));
		} else {
			errmsg("Under-read bytes for DATE - wanted %d, got %d\n", seclen, n);
			return 0;
		}
	} else {
		errmsg("Nothing to read from fd_date - try tuning to a multiplex?\n");
		return 0;
	}
	close(fd_date);
	*dvb_time = t;
	return 0;
}


/*
 * Set the system time
 */
int set_time(time_t * new_time)
{
	if (stime(new_time)) {
		perror("Unable to set time");
		return -1;
	}
	return 0;
}


int main(int argc, char **argv)
{
	time_t dvb_time;
	time_t real_time;
	time_t offset;
	int ret;

	do_print = 0;
	do_force = 0;
	do_set = 0;
	do_quiet = 0;
	ProgName = argv[0];

/*
 * Process command line arguments
 */
	do_options(argc, argv);
	if (do_quiet && do_print) {
		errmsg("quiet and print options are mutually exclusive.\n");
		exit(1);
	}
/*
 * Get the date from the currently tuned TDT multiplex
 */
	ret = scan_date(&dvb_time, timeout);
	if (ret != 0) {
		errmsg("Unable to get time from multiplex.\n");
		exit(1);
	}
	time(&real_time);
	offset = dvb_time - real_time;
	if (do_print) {
		fprintf(stdout, "System time: %s", ctime(&real_time));
		fprintf(stdout, "   TDT time: %s", ctime(&dvb_time));
		fprintf(stdout, "     Offset: %ld seconds\n", offset);
	} else if (!do_quiet) {
		fprintf(stdout, "%s", ctime(&dvb_time));
	}
	if (do_set) {
		if (labs(offset) > ALLOWABLE_DELTA) {
			if (do_force) {
				if (0 != set_time(&dvb_time)) {
					errmsg("setting the time failed\n");
				}
			} else {
				errmsg("multiplex time differs by more than %d from system.\n", ALLOWABLE_DELTA);
				errmsg("use -f to force system clock to new time.\n");
				exit(1);
			}
		} else {
			set_time(&dvb_time);
		}
	}			/* #end if (do_set) */
	return (0);
}