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/* $OpenBSD: ntp_msg.c,v 1.22 2016/09/03 11:52:06 reyk Exp $ */
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/*
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* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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* Copyright (c) 2004 Alexander Guy <alexander.guy@andern.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "ntpd.h"
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int
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ntp_getmsg(struct sockaddr *sa, char *p, ssize_t len, struct ntp_msg *msg)
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{
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if (len != NTP_MSGSIZE_NOAUTH && len != NTP_MSGSIZE) {
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log_debug("malformed packet received from %s",
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log_sockaddr(sa));
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return (-1);
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}
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memcpy(msg, p, sizeof(*msg));
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return (0);
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}
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int
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ntp_sendmsg(int fd, struct sockaddr *sa, struct ntp_msg *msg)
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{
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socklen_t sa_len;
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ssize_t n;
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if (sa != NULL)
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sa_len = SA_LEN(sa);
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else
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sa_len = 0;
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n = sendto(fd, msg, sizeof(*msg), 0, sa, sa_len);
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if (n == -1) {
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if (errno == ENOBUFS || errno == EHOSTUNREACH ||
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errno == ENETDOWN || errno == EHOSTDOWN) {
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/* logging is futile */
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return (-1);
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}
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log_warn("sendto");
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return (-1);
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}
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if (n != sizeof(*msg)) {
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log_warnx("ntp_sendmsg: only %zd of %zu bytes sent", n,
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sizeof(*msg));
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return (-1);
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}
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return (0);
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}
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