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/* $OpenBSD: ntp_msg.c,v 1.20 2015/01/09 07:35:37 deraadt Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2004 Alexander Guy <alexander.guy@andern.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "ntpd.h"
int
ntp_getmsg(struct sockaddr *sa, char *p, ssize_t len, struct ntp_msg *msg)
{
if (len != NTP_MSGSIZE_NOAUTH && len != NTP_MSGSIZE) {
log_debug("malformed packet received from %s",
log_sockaddr(sa));
return (-1);
}
memcpy(msg, p, sizeof(*msg));
return (0);
}
int
ntp_sendmsg(int fd, struct sockaddr *sa, struct ntp_msg *msg)
{
socklen_t sa_len;
ssize_t n;
if (sa != NULL)
sa_len = SA_LEN(sa);
else
sa_len = 0;
n = sendto(fd, msg, sizeof(*msg), 0, sa, sa_len);
if (n == -1) {
if (errno == ENOBUFS || errno == EHOSTUNREACH ||
errno == ENETDOWN || errno == EHOSTDOWN) {
/* logging is futile */
return (-1);
}
log_warn("sendto");
return (-1);
}
if (n != sizeof(*msg)) {
log_warnx("ntp_sendmsg: only %zd of %zu bytes sent", n,
sizeof(*msg));
return (-1);
}
return (0);
}
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