contrib/ntpd/ntp_msg.c

   1 /*      $OpenBSD: src/usr.sbin/ntpd/ntp_msg.c,v 1.14 2004/12/14 06:27:13 dtucker 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 #include "ntp.h"
  28
  29 int
  30 ntp_getmsg(char *p, ssize_t len, struct ntp_msg *msg)
  31 {
  32         if (len != NTP_MSGSIZE_NOAUTH && len != NTP_MSGSIZE) {
  33                 log_warnx("malformed packet received");
  34                 return (-1);
  35         }
  36
  37 #define copyin(f,p)     memcpy(&(f), (p), sizeof(f)); (p) += sizeof(f)
  38
  39         copyin(msg->status, p);
  40         copyin(msg->stratum, p);
  41         copyin(msg->ppoll, p);
  42         copyin(msg->precision, p);
  43         copyin(msg->rootdelay.int_parts, p);
  44         copyin(msg->rootdelay.fractions, p);
  45         copyin(msg->dispersion.int_parts, p);
  46         copyin(msg->dispersion.fractions, p);
  47         copyin(msg->refid, p);
  48         copyin(msg->reftime.int_partl, p);
  49         copyin(msg->reftime.fractionl, p);
  50         copyin(msg->orgtime.int_partl, p);
  51         copyin(msg->orgtime.fractionl, p);
  52         copyin(msg->rectime.int_partl, p);
  53         copyin(msg->rectime.fractionl, p);
  54         copyin(msg->xmttime.int_partl, p);
  55         copyin(msg->xmttime.fractionl, p);
  56
  57         return (0);
  58 }
  59
  60 int
  61 ntp_sendmsg(int fd, struct sockaddr *sa, struct ntp_msg *msg, ssize_t len,
  62     int auth)
  63 {
  64         char             buf[NTP_MSGSIZE];
  65         char            *p = buf;
  66         socklen_t       sa_len;
  67
  68 #define copyout(p,f)    memcpy((p), &(f), sizeof(f)); p += sizeof(f)
  69
  70         copyout(p, msg->status);
  71         copyout(p, msg->stratum);
  72         copyout(p, msg->ppoll);
  73         copyout(p, msg->precision);
  74         copyout(p, msg->rootdelay.int_parts);
  75         copyout(p, msg->rootdelay.fractions);
  76         copyout(p, msg->dispersion.int_parts);
  77         copyout(p, msg->dispersion.fractions);
  78         copyout(p, msg->refid);
  79         copyout(p, msg->reftime.int_partl);
  80         copyout(p, msg->reftime.fractionl);
  81         copyout(p, msg->orgtime.int_partl);
  82         copyout(p, msg->orgtime.fractionl);
  83         copyout(p, msg->rectime.int_partl);
  84         copyout(p, msg->rectime.fractionl);
  85         copyout(p, msg->xmttime.int_partl);
  86         copyout(p, msg->xmttime.fractionl);
  87
  88         if (sa != NULL)
  89                 sa_len = SA_LEN(sa);
  90         else
  91                 sa_len = 0;
  92
  93         if (sendto(fd, &buf, len, 0, sa, sa_len) != len) {
  94                 if (errno == ENOBUFS || errno == EHOSTUNREACH ||
  95                     errno == ENETDOWN || errno == EHOSTDOWN) {
  96                         /* logging is futile */
  97                         return (-1);
  98                 }
  99                 log_warn("sendto");
 100                 return (-1);
 101         }
 102
 103         return (0);
 104 }