minix/usr.sbin/rdate/rdate.c
Thomas Cort 8357e3a442 Importing usr.sbin/rdate
Import the NetBSD rdate command and remove the Minix rdate command.
The default behaviour for both is the same. The NetBSD version adds
options to just display the time, adjust the time using adjtime(),
and set the time without printing the time.

Porting Notes:
 - Compiles cleanly out of the box without any warnings
 - Path changes from /usr/bin/rdate to /usr/sbin/rdate
 - checked pkgsrc for any usages of rdate (none found)
 - checked src for any usages of rdate (none found)

Testing:
 - all command line options work (tested with time.nist.gov server)
 - Native and cross build OK

Change-Id: I613449763891a896527f337999c006a970c3924c
2013-04-08 08:37:04 +02:00

170 lines
4.3 KiB
C

/* $NetBSD: rdate.c,v 1.19 2009/10/21 01:07:47 snj Exp $ */
/*
* Copyright (c) 1994 Christos Zoulas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* rdate.c: Set the date from the specified host
*
* Uses the rfc868 time protocol at socket 37.
* Time is returned as the number of seconds since
* midnight January 1st 1900.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rdate.c,v 1.19 2009/10/21 01:07:47 snj Exp $");
#endif /* lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
/* seconds from midnight Jan 1900 - 1970 */
#define DIFFERENCE 2208988800ULL
int main(int, char **);
static void usage(void);
static void
usage(void)
{
(void) fprintf(stderr, "usage: %s [-psa] host\n", getprogname());
(void) fprintf(stderr, " -p: just print, don't set\n");
(void) fprintf(stderr, " -s: just set, don't print\n");
(void) fprintf(stderr, " -a: use adjtime instead of instant change\n");
}
int
main(int argc, char *argv[])
{
int pr = 0, silent = 0, s;
int slidetime = 0;
int adjustment;
uint32_t data;
time_t tim;
char *hname;
const char *emsg = NULL;
struct addrinfo hints, *res, *res0;
int c;
int error;
adjustment = 0;
while ((c = getopt(argc, argv, "psa")) != -1)
switch (c) {
case 'p':
pr++;
break;
case 's':
silent++;
break;
case 'a':
slidetime++;
break;
default:
usage();
return 1;
}
if (argc - 1 != optind) {
usage();
return 1;
}
hname = argv[optind];
memset(&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(hname, "time", &hints, &res0);
if (error)
errx(1, "%s: %s", gai_strerror(error), hname);
for (res = res0, s = -1; res != NULL; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0) {
emsg = "socket";
continue;
}
if (connect(s, res->ai_addr, res->ai_addrlen)) {
close(s);
s = -1;
emsg = "connect";
continue;
}
break;
}
if (s < 0)
err(1, "%s", emsg);
if (read(s, &data, sizeof(uint32_t)) != sizeof(uint32_t))
err(1, "Could not read data");
(void) close(s);
tim = ntohl(data) - DIFFERENCE;
if (!pr) {
struct timeval tv;
if (!slidetime) {
logwtmp("|", "date", "");
tv.tv_sec = tim;
tv.tv_usec = 0;
if (settimeofday(&tv, NULL) == -1)
err(1, "Could not set time of day");
logwtmp("{", "date", "");
} else {
struct timeval tv_current;
if (gettimeofday(&tv_current, NULL) == -1)
err(1, "Could not get local time of day");
adjustment = tv.tv_sec = tim - tv_current.tv_sec;
tv.tv_usec = 0;
if (adjtime(&tv, NULL) == -1)
err(1, "Could not adjust time of day");
}
}
if (!silent) {
(void) fputs(ctime(&tim), stdout);
if (slidetime)
(void) fprintf(stdout,
"%s: adjust local clock by %d seconds\n",
getprogname(), adjustment);
}
return 0;
}