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 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 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