/* 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.
+ * and optionally set the system time.
*
* by Sterling Huxley <sterling@europa.com>
*
- * Licensed under GPL v2 or later, see file License for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <string.h>
-#include <time.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <signal.h>
+//usage:#define rdate_trivial_usage
+//usage: "[-sp] HOST"
+//usage:#define rdate_full_usage "\n\n"
+//usage: "Get and possibly set the system date/time from a remote HOST\n"
+//usage: "\n -s Set the system date/time (default)"
+//usage: "\n -p Print the date/time"
-#include "busybox.h"
+#include "libbb.h"
+enum { RFC_868_BIAS = 2208988800UL };
-static const int RFC_868_BIAS = 2208988800UL;
-
-static void socket_timeout(int sig)
+static void socket_timeout(int sig UNUSED_PARAM)
{
bb_error_msg_and_die("timeout connecting to time server");
}
static time_t askremotedate(const char *host)
{
- unsigned long nett;
- struct sockaddr_in s_in;
+ uint32_t nett;
int fd;
- bb_lookup_host(&s_in, host);
- s_in.sin_port = bb_lookup_port("time", "tcp", 37);
-
/* Add a timeout for dead or inaccessible servers */
alarm(10);
signal(SIGALRM, socket_timeout);
- fd = xconnect_tcp_v4(&s_in);
+ fd = create_and_connect_stream_or_die(host, bb_lookup_port("time", "tcp", 37));
- if (safe_read(fd, (void *)&nett, 4) != 4) /* read time from server */
+ if (safe_read(fd, &nett, 4) != 4) /* read time from server */
bb_error_msg_and_die("%s did not send the complete time", host);
- close(fd);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
- /* convert from network byte order to local byte order.
+ /* 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
+ * 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.
*/
return ntohl(nett) - RFC_868_BIAS;
}
-int rdate_main(int argc, char **argv)
+int rdate_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int rdate_main(int argc UNUSED_PARAM, char **argv)
{
time_t remote_time;
- unsigned long flags;
+ unsigned flags;
opt_complementary = "-1";
- flags = getopt32(argc, argv, "sp");
+ flags = getopt32(argv, "sp");
remote_time = askremotedate(argv[optind]);
- if ((flags & 2) == 0) {
+ if (!(flags & 2)) { /* no -p (-s may be present) */
time_t current_time;
time(¤t_time);
bb_error_msg("current time matches remote time");
else
if (stime(&remote_time) < 0)
- bb_perror_msg_and_die("cannot set time of day");
+ bb_perror_msg_and_die("can't set time of day");
}
- if ((flags & 1) == 0)
+ if (flags != 1) /* not lone -s */
printf("%s", ctime(&remote_time));
return EXIT_SUCCESS;