1 files changed, 346 insertions, 0 deletions
diff --git a/util/dvbdate/dvbdate.c b/util/dvbdate/dvbdate.c
new file mode 100644
index 0000000..9821012
--- /dev/null
+++ b/util/dvbdate/dvbdate.c
@@ -0,0 +1,346 @@
+/*
+
+   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);
+}