1 files changed, 121 insertions, 0 deletions

diff --git a/busybox/util-linux/rdate.c b/busybox/util-linux/rdate.c
new file mode 100644
index 000000000..a73e8eebf
--- /dev/null
+++ b/busybox/util-linux/rdate.c
@@ -0,0 +1,121 @@
+/* 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"
+
+
+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;
+        struct sockaddr_in s_in;
+        int fd;
+
+        bb_lookup_host(&s_in, host);
+        s_in.sin_port = bb_lookup_port("time", "tcp", 37);
+
+        /* Add a timeout for dead or non accessable servers */
+        alarm(10);
+        signal(SIGALRM, socket_timeout);
+
+        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.
+         * 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;
+        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:
+                                bb_show_usage();
+                }
+        }
+
+        if (optind == argc)
+                bb_show_usage();
+
+        remote_time = askremotedate(argv[optind]);
+
+        if (setdate) {
+                time_t current_time;
+
+                time(&current_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)
+                printf("%s", ctime(&remote_time));
+
+        return EXIT_SUCCESS;
+}