1 /* $OpenBSD: ntp_msg.c,v 1.18 2007/10/19 15:53:57 otto 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 MIND, USE, DATA OR PROFITS, WHETHER 16 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 17 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/param.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, ssize_t len, 44 int auth) 45 { 46 socklen_t sa_len; 47 ssize_t n; 48 49 if (sa != NULL) 50 sa_len = SA_LEN(sa); 51 else 52 sa_len = 0; 53 54 n = sendto(fd, msg, sizeof(*msg), 0, sa, sa_len); 55 if (n == -1) { 56 if (errno == ENOBUFS || errno == EHOSTUNREACH || 57 errno == ENETDOWN || errno == EHOSTDOWN) { 58 /* logging is futile */ 59 return (-1); 60 } 61 log_warn("sendto"); 62 return (-1); 63 } 64 65 if (n != sizeof(*msg)) { 66 log_warnx("ntp_sendmsg: only %ld of %ld bytes sent", n, 67 sizeof(*msg)); 68 return (-1); 69 } 70 71 return (0); 72 } 73