1 /* $OpenBSD: ntp_msg.c,v 1.22 2016/09/03 11:52:06 reyk Exp $ */
2
3 /*
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5 * Copyright (c) 2004 Alexander Guy <alexander.guy@andern.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/types.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <errno.h>
25
26 #include "ntpd.h"
27
28 int
ntp_getmsg(struct sockaddr * sa,char * p,ssize_t len,struct ntp_msg * msg)29 ntp_getmsg(struct sockaddr *sa, char *p, ssize_t len, struct ntp_msg *msg)
30 {
31 if (len != NTP_MSGSIZE_NOAUTH && len != NTP_MSGSIZE) {
32 log_debug("malformed packet received from %s",
33 log_sockaddr(sa));
34 return (-1);
35 }
36
37 memcpy(msg, p, sizeof(*msg));
38
39 return (0);
40 }
41
42 int
ntp_sendmsg(int fd,struct sockaddr * sa,struct ntp_msg * msg)43 ntp_sendmsg(int fd, struct sockaddr *sa, struct ntp_msg *msg)
44 {
45 socklen_t sa_len;
46 ssize_t n;
47
48 if (sa != NULL)
49 sa_len = SA_LEN(sa);
50 else
51 sa_len = 0;
52
53 n = sendto(fd, msg, sizeof(*msg), 0, sa, sa_len);
54 if (n == -1) {
55 if (errno == ENOBUFS || errno == EHOSTUNREACH ||
56 errno == ENETDOWN || errno == EHOSTDOWN) {
57 /* logging is futile */
58 return (-1);
59 }
60 log_warn("sendto");
61 return (-1);
62 }
63
64 if (n != sizeof(*msg)) {
65 log_warnx("ntp_sendmsg: only %zd of %zu bytes sent", n,
66 sizeof(*msg));
67 return (-1);
68 }
69
70 return (0);
71 }
72