*
* 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
- *
+ * Licensed under GPL v2 or later, see file License for details.
*/
-#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"
static const int RFC_868_BIAS = 2208988800UL;
+static void socket_timeout(int sig)
+{
+ bb_error_msg_and_die("timeout connecting to time server");
+}
+
static time_t askremotedate(const char *host)
{
- unsigned long int nett, localt;
- const char *port="37";
+ unsigned long nett;
+ struct sockaddr_in s_in;
int fd;
- if (getservbyname("time", "tcp") != NULL)
- port="time";
+ bb_lookup_host(&s_in, host);
+ s_in.sin_port = bb_lookup_port("time", "tcp", 37);
- fd = xconnect(host, port);
+ /* Add a timeout for dead or inaccessible servers */
+ alarm(10);
+ signal(SIGALRM, socket_timeout);
- if (read(fd, (void *)&nett, 4) != 4) /* read time from server */
- error_msg_and_die("%s did not send the complete time", host);
+ fd = xconnect(&s_in);
+ if (safe_read(fd, (void *)&nett, 4) != 4) /* read time from server */
+ bb_error_msg_and_die("%s did not send the complete time", host);
close(fd);
/* convert from network byte order to local byte order.
* 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);
+ return(ntohl(nett) - RFC_868_BIAS);
}
int rdate_main(int argc, char **argv)
{
time_t remote_time;
- int opt;
- int setdate = 1;
- int printdate = 1;
-
- /* Interpret command line args */
- while ((opt = getopt(argc, argv, "sp")) > 0) {
- switch (opt) {
- case 's':
- printdate = 0;
- setdate = 1;
- break;
- case 'p':
- printdate = 1;
- setdate = 0;
- break;
- default:
- show_usage();
- }
- }
+ unsigned long flags;
- if (optind == argc)
- show_usage();
+ bb_opt_complementally = "-1";
+ flags = bb_getopt_ulflags(argc, argv, "sp");
remote_time = askremotedate(argv[optind]);
- if (setdate) {
- if (stime(&remote_time) < 0)
- perror_msg_and_die("Could not set time of day");
+ if ((flags & 2) == 0) {
+ time_t current_time;
+
+ time(¤t_time);
+ if (current_time == remote_time)
+ bb_error_msg("Current time matches remote time.");
+ else
+ if (stime(&remote_time) < 0)
+ bb_perror_msg_and_die("Could not set time of day");
}
- if (printdate)
+ if ((flags & 1) == 0)
printf("%s", ctime(&remote_time));
return EXIT_SUCCESS;