rdate implimentation from <christos@deshaw.com>
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deraadt
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# @(#) $Id: Makefile,v 1.1 1994/06/02 22:54:59 deraadt Exp $
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PROG= rdate
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SRCS= rdate.c
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MAN8= rdate.0
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.include <bsd.prog.mk>
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.\"
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.\" Copyright (c) 1994 Christos Zoulas
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Christos Zoulas.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Id: rdate.1,v 1.1 1994/06/02 22:55:03 deraadt Exp $
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.\"
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.Dd April 30, 1994
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.Dt RDATE 1
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.Os
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.Sh NAME
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.Nm rdate
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.Nd set the system's date from a remote host
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.Sh SYNOPSIS
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.Nm rdate
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.Op Fl ps
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.Ar host
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.Sh DESCRIPTION
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.Nm Rdate
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displays and sets the local date and time from the
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host name or address given as the argument. It uses the RFC868
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protocol which is usually implemented as a built-in service of
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.Xr inetd(1).
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.Pp
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Available options:
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.Pp
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.Bl -tag -width indent
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.It Fl p
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Do not set, just print the remote time
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.It Fl s
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Do not print the time.
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.Sh SEE ALSO
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.Xr inetd 1
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@ -0,0 +1,141 @@
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/*
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* Copyright (c) 1994 Christos Zoulas
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christos Zoulas.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: rdate.c,v 1.1 1994/06/02 22:55:07 deraadt Exp $
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*/
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/*
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* rdate.c: Set the date from the specified host
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*
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* Uses the rfc868 time protocol at socket 37.
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* Time is returned as the number of seconds since
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* midnight January 1st 1900.
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*/
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#ifndef lint
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static char rcsid[] = "$Id: rdate.c,v 1.1 1994/06/02 22:55:07 deraadt Exp $";
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#endif /* lint */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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/* seconds from midnight Jan 1900 - 1970 */
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#if __STDC__
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#define DIFFERENCE 2208988800UL
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#else
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#define DIFFERENCE 2208988800
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#endif
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int pr = 0, silent = 0, s;
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time_t tim;
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char *hname;
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struct hostent *hp;
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struct protoent *pp, ppp;
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struct servent *sp, ssp;
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struct sockaddr_in sa;
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extern char *__progname;
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extern int optind;
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int c;
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while ((c = getopt(argc, argv, "ps")) != -1)
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switch (c) {
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case 'p':
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pr++;
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break;
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case 's':
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silent++;
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break;
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default:
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goto usage;
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}
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if (argc - 1 != optind) {
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usage:
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(void) fprintf(stderr, "Usage: %s [-ps] host\n", __progname);
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return (1);
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}
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hname = argv[optind];
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if ((hp = gethostbyname(hname)) == NULL) {
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fprintf(stderr, "%s: ", __progname);
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herror(hname);
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exit(1);
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}
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if ((sp = getservbyname("time", "tcp")) == NULL) {
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sp = &ssp;
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sp->s_port = 37;
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sp->s_proto = "tcp";
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}
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if ((pp = getprotobyname(sp->s_proto)) == NULL) {
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pp = &ppp;
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pp->p_proto = 6;
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}
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if ((s = socket(AF_INET, SOCK_STREAM, pp->p_proto)) == -1)
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err(1, "Could not create socket");
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bzero(&sa, sizeof sa);
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sa.sin_family = AF_INET;
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sa.sin_port = sp->s_port;
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memcpy(&(sa.sin_addr.s_addr), hp->h_addr, hp->h_length);
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if (connect(s, (struct sockaddr *) & sa, sizeof(sa)) == -1)
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err(1, "Could not connect socket");
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if (read(s, &tim, sizeof(time_t)) != sizeof(time_t))
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err(1, "Could not read data");
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(void) close(s);
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tim = ntohl(tim) - DIFFERENCE;
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if (!pr) {
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struct timeval tv;
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tv.tv_sec = tim;
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tv.tv_usec = 0;
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if (settimeofday(&tv, NULL) == -1)
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err(1, "Could not set time of day");
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}
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if (!silent)
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(void) fputs(ctime(&tim), stdout);
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return 0;
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}
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