1 /* $OpenBSD: rfc868time.c,v 1.13 2023/01/04 13:00:11 jsg Exp $ */
2 /* $NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk Exp $ */
3
4 /*
5 * Copyright (c) 1994 Christos Zoulas
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * rdate.c: Set the date from the specified host
31 *
32 * Uses the rfc868 time protocol at socket 37 (tcp).
33 * Time is returned as the number of seconds since
34 * midnight January 1st 1900.
35 */
36
37 #include <sys/socket.h>
38 #include <sys/time.h>
39 #include <netinet/in.h>
40
41 #include <stdio.h>
42 #include <ctype.h>
43 #include <err.h>
44 #include <string.h>
45 #include <netdb.h>
46 #include <unistd.h>
47 #include <time.h>
48
49 /* Obviously it is not just for SNTP clients... */
50 #include "ntpleaps.h"
51
52 /* seconds from midnight Jan 1900 - 1970 */
53 #define DIFFERENCE 2208988800UL
54
55 void
56 rfc868time_client(const char *hostname, int family, struct timeval *new,
57 struct timeval *adjust, int leapflag);
58
59
60 void
rfc868time_client(const char * hostname,int family,struct timeval * new,struct timeval * adjust,int leapflag)61 rfc868time_client(const char *hostname, int family, struct timeval *new,
62 struct timeval *adjust, int leapflag)
63 {
64 struct addrinfo hints, *res0, *res;
65 struct timeval old;
66 u_int32_t tim; /* RFC 868 states clearly this is an uint32 */
67 int s;
68 int error;
69 u_int64_t td;
70
71 memset(&hints, 0, sizeof(hints));
72 hints.ai_family = family;
73 hints.ai_socktype = SOCK_STREAM;
74 error = getaddrinfo(hostname, "time", &hints, &res0);
75 if (error) {
76 errx(1, "%s: %s", hostname, gai_strerror(error));
77 /*NOTREACHED*/
78 }
79
80 if (pledge("stdio inet", NULL) == -1)
81 err(1, "pledge");
82
83 s = -1;
84 for (res = res0; res; res = res->ai_next) {
85 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
86 if (s == -1)
87 continue;
88
89 if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
90 close(s);
91 s = -1;
92 continue;
93 }
94
95 break;
96 }
97 if (s == -1)
98 err(1, "Could not connect socket");
99 freeaddrinfo(res0);
100
101 if (read(s, &tim, sizeof(tim)) != sizeof(tim))
102 err(1, "Could not read data");
103
104 (void) close(s);
105 tim = ntohl(tim) - DIFFERENCE;
106
107 if (gettimeofday(&old, NULL) == -1)
108 err(1, "Could not get local time of day");
109
110 td = SEC_TO_TAI64(old.tv_sec);
111 if (leapflag)
112 ntpleaps_sub(&td);
113
114 adjust->tv_sec = tim - TAI64_TO_SEC(td);
115 adjust->tv_usec = 0;
116
117 new->tv_sec = old.tv_sec + adjust->tv_sec;
118 new->tv_usec = 0;
119 }
120