hush/util-linux/rdate.c

115 lines
2.7 KiB
C
Raw Normal View History

2000-08-21 23:04:00 +00:00
/* vi: set sw=4 ts=4: */
/*
* The Rdate command will ask a time server for the RFC 868 time
* and optionally set the system time.
*
* by Sterling Huxley <sterling@europa.com>
*
* 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
*
*/
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include "busybox.h"
2000-08-21 23:04:00 +00:00
static const int RFC_868_BIAS = 2208988800UL;
2000-08-21 23:04:00 +00:00
static void socket_timeout(int sig)
{
2003-09-12 08:32:24 +00:00
bb_error_msg_and_die("timeout connecting to time server");
}
static time_t askremotedate(const char *host)
2000-08-21 23:04:00 +00:00
{
unsigned long int nett, localt;
struct sockaddr_in s_in;
2000-08-21 23:04:00 +00:00
int fd;
bb_lookup_host(&s_in, host, "time");
2001-10-01 17:52:14 +00:00
/* Add a timeout for dead or non accessable servers */
alarm(10);
signal(SIGALRM, socket_timeout);
fd = xconnect(&s_in);
2003-07-22 08:26:05 +00:00
if (safe_read(fd, (void *)&nett, 4) != 4) /* read time from server */
2003-03-19 09:13:01 +00:00
bb_error_msg_and_die("%s did not send the complete time", host);
2000-08-21 23:04:00 +00:00
close(fd);
/* convert from network byte order to local byte order.
* RFC 868 time is the number of seconds
* since 00:00 (midnight) 1 January 1900 GMT
* the RFC 868 time 2,208,988,800 corresponds to 00:00 1 Jan 1970 GMT
* Subtract the RFC 868 time to get Linux epoch
*/
localt= ntohl(nett) - RFC_868_BIAS;
return(localt);
}
int rdate_main(int argc, char **argv)
{
time_t remote_time;
2000-08-21 23:04:00 +00:00
int opt;
2001-07-30 14:43:20 +00:00
int setdate = 1;
int printdate = 1;
2000-08-21 23:04:00 +00:00
/* Interpret command line args */
2001-07-30 14:43:20 +00:00
while ((opt = getopt(argc, argv, "sp")) > 0) {
2000-08-21 23:04:00 +00:00
switch (opt) {
case 's':
2001-07-30 14:43:20 +00:00
printdate = 0;
setdate = 1;
2000-08-21 23:04:00 +00:00
break;
case 'p':
2001-07-30 14:43:20 +00:00
printdate = 1;
setdate = 0;
2000-08-21 23:04:00 +00:00
break;
2001-07-30 14:43:20 +00:00
default:
2003-03-19 09:13:01 +00:00
bb_show_usage();
2000-08-21 23:04:00 +00:00
}
}
if (optind == argc)
2003-03-19 09:13:01 +00:00
bb_show_usage();
2000-08-21 23:04:00 +00:00
remote_time = askremotedate(argv[optind]);
2000-08-21 23:04:00 +00:00
if (setdate) {
if (stime(&remote_time) < 0)
2003-03-19 09:13:01 +00:00
bb_perror_msg_and_die("Could not set time of day");
2000-08-21 23:04:00 +00:00
}
if (printdate)
printf("%s", ctime(&remote_time));
2000-08-21 23:04:00 +00:00
return EXIT_SUCCESS;
2000-08-21 23:04:00 +00:00
}