1 files changed, 135 insertions, 0 deletions
diff --git a/util-linux/rdate.c b/util-linux/rdate.c
new file mode 100644
index 000000000..0668d302a
--- /dev/null
+++ b/util-linux/rdate.c
@@ -0,0 +1,135 @@
+/* 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 "internal.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>
+
+
+#define RFC_868_BIAS	2208988800UL
+
+int setdate= 0;
+int printdate= 0;
+
+time_t askremotedate(char *host)
+{
+	struct hostent *h;
+	struct sockaddr_in sin;
+	struct servent *tserv;
+	unsigned long int nett, localt;
+	int fd;
+
+	if (!(h = gethostbyname(host))) {	/* get the IP addr */
+		errorMsg("%s: %s\n", host, strerror(errno));
+		return(-1);
+	}
+	if ((tserv = getservbyname("time", "tcp")) == NULL) { /* find port # */
+		errorMsg("%s: %s\n", "time", strerror(errno));
+		return(-1);
+	}
+	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {  /* get net connection */
+		errorMsg("%s: %s\n", "socket", strerror(errno));
+		return(-1);
+	}
+
+	memcpy(&sin.sin_addr, h->h_addr, sizeof(sin.sin_addr));
+	sin.sin_port= tserv->s_port;
+	sin.sin_family = AF_INET;
+
+	if (connect(fd, &sin, sizeof(sin)) < 0) {	/* connect to time server */
+		errorMsg("%s: %s\n", host, strerror(errno));
+		close(fd);
+		return(-1);
+	}
+	if (read(fd, &nett, 4) != 4) {	/* read time from server */
+		close(fd);
+		errorMsg("%s did not send the complete time\n", 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 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);
+				return(FALSE);
+				break;
+			case 's':
+				setdate++;
+				break;
+			case 'p':
+				printdate++;
+				break;
+		}
+	}
+
+	/* the default action is to set the date */
+	if (printdate==0 && setdate==0) setdate++;
+
+	if (optind == argc) {
+		usage(rdate_usage);
+		return(FALSE);
+	}
+
+	if ((time= askremotedate(argv[optind])) == (time_t)-1) {
+		return(FALSE);
+	}
+	if (setdate) {
+		if (stime(&time) < 0)
+			fatalError("Could not set time of day: %s\n", strerror(errno));
+	}
+	if (printdate) {
+		fprintf(stdout, "%s", ctime(&time));
+	}
+
+	return(TRUE);
+}