2000-08-21 23:04:00 +00:00
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/* vi: set sw=4 ts=4: */
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/*
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* The Rdate command will ask a time server for the RFC 868 time
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* and optionally set the system time.
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*
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* by Sterling Huxley <sterling@europa.com>
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*
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2005-10-28 09:24:33 +00:00
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* Licensed under GPL v2 or later, see file License for details.
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2000-08-21 23:04:00 +00:00
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*/
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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2000-08-21 23:04:00 +00:00
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2007-01-11 16:50:23 +00:00
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enum { RFC_868_BIAS = 2208988800UL };
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2000-08-21 23:04:00 +00:00
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2003-10-09 11:38:45 +00:00
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static void socket_timeout(int sig)
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2003-09-12 05:50:51 +00:00
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{
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2003-09-12 08:32:24 +00:00
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bb_error_msg_and_die("timeout connecting to time server");
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2003-09-12 05:50:51 +00:00
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}
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2001-03-19 19:41:54 +00:00
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static time_t askremotedate(const char *host)
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2000-08-21 23:04:00 +00:00
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{
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2007-01-11 16:50:23 +00:00
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uint32_t nett;
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2000-08-21 23:04:00 +00:00
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int fd;
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2005-10-28 09:24:33 +00:00
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/* Add a timeout for dead or inaccessible servers */
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2003-09-12 05:50:51 +00:00
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alarm(10);
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signal(SIGALRM, socket_timeout);
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2007-01-11 16:50:23 +00:00
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fd = create_and_connect_stream_or_die(host, bb_lookup_port("time", "tcp", 37));
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2001-03-19 19:41:54 +00:00
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2003-07-22 08:26:05 +00:00
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if (safe_read(fd, (void *)&nett, 4) != 4) /* read time from server */
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2003-03-19 09:13:01 +00:00
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bb_error_msg_and_die("%s did not send the complete time", host);
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2000-08-21 23:04:00 +00:00
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close(fd);
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/* convert from network byte order to local byte order.
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* RFC 868 time is the number of seconds
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2007-01-11 16:50:23 +00:00
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* since 00:00 (midnight) 1 January 1900 GMT
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* the RFC 868 time 2,208,988,800 corresponds to 00:00 1 Jan 1970 GMT
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* Subtract the RFC 868 time to get Linux epoch
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2000-08-21 23:04:00 +00:00
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*/
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2006-01-25 00:08:53 +00:00
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2006-11-27 16:49:31 +00:00
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return ntohl(nett) - RFC_868_BIAS;
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2000-08-21 23:04:00 +00:00
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}
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2007-02-03 17:28:39 +00:00
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int rdate_main(int argc, char **argv);
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2000-08-21 23:04:00 +00:00
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int rdate_main(int argc, char **argv)
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{
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2001-03-21 07:34:27 +00:00
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time_t remote_time;
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2005-10-28 15:43:41 +00:00
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unsigned long flags;
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2006-01-25 00:08:53 +00:00
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2006-10-03 21:00:06 +00:00
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opt_complementary = "-1";
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2007-08-18 15:32:12 +00:00
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flags = getopt32(argv, "sp");
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2006-01-25 00:08:53 +00:00
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2001-03-21 07:34:27 +00:00
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remote_time = askremotedate(argv[optind]);
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2001-03-19 19:41:54 +00:00
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2006-06-03 10:24:20 +00:00
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if ((flags & 2) == 0) {
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2003-12-19 11:29:29 +00:00
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time_t current_time;
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time(¤t_time);
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if (current_time == remote_time)
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2006-10-05 23:12:49 +00:00
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bb_error_msg("current time matches remote time");
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2003-12-19 11:29:29 +00:00
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else
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if (stime(&remote_time) < 0)
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2006-10-05 23:12:49 +00:00
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bb_perror_msg_and_die("cannot set time of day");
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2006-06-03 10:24:20 +00:00
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}
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2006-01-25 00:08:53 +00:00
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2006-06-03 10:24:20 +00:00
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if ((flags & 1) == 0)
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printf("%s", ctime(&remote_time));
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2000-08-21 23:04:00 +00:00
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2000-12-01 02:55:13 +00:00
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return EXIT_SUCCESS;
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2000-08-21 23:04:00 +00:00
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}
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