/* 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>
*
- * 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 GPLv2 or later, see file LICENSE in this source tree.
*/
-#include "busybox.h"
-#define BB_DECLARE_EXTERN
-#include "messages.c"
-#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>
+//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 "libbb.h"
-#define RFC_868_BIAS 2208988800UL
+enum { RFC_868_BIAS = 2208988800UL };
-int setdate= 0;
-int printdate= 0;
+static void socket_timeout(int sig UNUSED_PARAM)
+{
+ bb_error_msg_and_die("timeout connecting to time server");
+}
-time_t askremotedate(char *host)
+static time_t askremotedate(const char *host)
{
- struct hostent *h;
- struct sockaddr_in sin;
- struct servent *tserv;
- unsigned long int nett, localt;
+ uint32_t nett;
int fd;
- if (!(h = gethostbyname(host))) { /* get the IP addr */
- perror_msg("%s", host);
- return(-1);
- }
- if ((tserv = getservbyname("time", "tcp")) == NULL) { /* find port # */
- perror_msg("%s", "time");
- return(-1);
- }
- if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { /* get net connection */
- perror_msg("%s", "socket");
- return(-1);
- }
+ /* Add a timeout for dead or inaccessible servers */
+ alarm(10);
+ signal(SIGALRM, socket_timeout);
- memcpy(&sin.sin_addr, h->h_addr, sizeof(sin.sin_addr));
- sin.sin_port= tserv->s_port;
- sin.sin_family = AF_INET;
+ fd = create_and_connect_stream_or_die(host, bb_lookup_port("time", "tcp", 37));
- if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) { /* connect to time server */
- perror_msg("%s", host);
+ if (safe_read(fd, &nett, 4) != 4) /* read time from server */
+ bb_error_msg_and_die("%s did not send the complete time", host);
+ if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
- return(-1);
- }
- if (read(fd, (void *)&nett, 4) != 4) { /* read time from server */
- close(fd);
- error_msg("%s did not send the complete time\n", host);
- }
- 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.
*/
- localt= ntohl(nett) - RFC_868_BIAS;
- return(localt);
+ 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 time;
- int opt;
-
- /* Interpret command line args */
- /* do special-case option parsing */
- if (argv[1] && (strcmp(argv[1], "--help") == 0))
- usage(rdate_usage);
-
- /* do normal option parsing */
- while ((opt = getopt(argc, argv, "Hsp")) > 0) {
- switch (opt) {
- default:
- case 'H':
- usage(rdate_usage);
- break;
- case 's':
- setdate++;
- break;
- case 'p':
- printdate++;
- break;
- }
- }
+ time_t remote_time;
+ unsigned flags;
- /* the default action is to set the date */
- if (printdate==0 && setdate==0) setdate++;
+ opt_complementary = "-1";
+ flags = getopt32(argv, "sp");
- if (optind == argc) {
- usage(rdate_usage);
- }
+ remote_time = askremotedate(argv[optind]);
- if ((time= askremotedate(argv[optind])) == (time_t)-1) {
- return EXIT_FAILURE;
- }
- if (setdate) {
- if (stime(&time) < 0)
- perror_msg_and_die("Could not set time of day");
- }
- if (printdate) {
- printf("%s", ctime(&time));
+ if (!(flags & 2)) { /* no -p (-s may be present) */
+ 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("can't set time of day");
}
+ if (flags != 1) /* not lone -s */
+ printf("%s", ctime(&remote_time));
+
return EXIT_SUCCESS;
}
projects / platform / upstream / busybox.git / blobdiff