diff options
Diffstat (limited to 'src/usr.sbin/rdate/rfc868time.c')
| -rw-r--r-- | src/usr.sbin/rdate/rfc868time.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/usr.sbin/rdate/rfc868time.c b/src/usr.sbin/rdate/rfc868time.c new file mode 100644 index 0000000..7f1b23b --- /dev/null +++ b/src/usr.sbin/rdate/rfc868time.c @@ -0,0 +1,122 @@ +/* $OpenBSD: rfc868time.c,v 1.9 2013/11/12 22:27:13 deraadt Exp $ */ +/* $NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Christos Zoulas. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * 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 (tcp). + * Time is returned as the number of seconds since + * midnight January 1st 1900. + */ + +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/time.h> +#include <netinet/in.h> + +#include <stdio.h> +#include <ctype.h> +#include <err.h> +#include <string.h> +#include <netdb.h> +#include <unistd.h> +#include <time.h> + +/* Obviously it is not just for SNTP clients... */ +#include "ntpleaps.h" + +/* seconds from midnight Jan 1900 - 1970 */ +#define DIFFERENCE 2208988800UL + +void +rfc868time_client(const char *hostname, int family, struct timeval *new, + struct timeval *adjust, int leapflag); + + +void +rfc868time_client(const char *hostname, int family, struct timeval *new, + struct timeval *adjust, int leapflag) +{ + struct addrinfo hints, *res0, *res; + struct timeval old; + u_int32_t tim; /* RFC 868 states clearly this is an uint32 */ + int s; + int error; + u_int64_t td; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = family; + hints.ai_socktype = SOCK_STREAM; + error = getaddrinfo(hostname, "time", &hints, &res0); + if (error) { + errx(1, "%s: %s", hostname, gai_strerror(error)); + /*NOTREACHED*/ + } + + s = -1; + for (res = res0; res; res = res->ai_next) { + s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); + if (s < 0) + continue; + + if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { + close(s); + s = -1; + continue; + } + + break; + } + if (s < 0) + err(1, "Could not connect socket"); + freeaddrinfo(res0); + + if (read(s, &tim, sizeof(tim)) != sizeof(tim)) + err(1, "Could not read data"); + + (void) close(s); + tim = ntohl(tim) - DIFFERENCE; + + if (gettimeofday(&old, NULL) == -1) + err(1, "Could not get local time of day"); + + td = SEC_TO_TAI64(old.tv_sec); + if (leapflag) + ntpleaps_sub(&td); + + adjust->tv_sec = tim - TAI64_TO_SEC(td); + adjust->tv_usec = 0; + + new->tv_sec = old.tv_sec + adjust->tv_sec; + new->tv_usec = 0; +} |