date/netdate.c

   1 /*      $NetBSD: netdate.c,v 1.16 1998/07/28 03:47:15 mycroft Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)netdate.c   8.2 (Berkeley) 4/28/95";
  40 #else
  41 __RCSID("$NetBSD: netdate.c,v 1.16 1998/07/28 03:47:15 mycroft Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/socket.h>
  48
  49 #include <netinet/in.h>
  50 #include <netdb.h>
  51 #define TSPTYPES
  52 #include <protocols/timed.h>
  53
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 #include "extern.h"
  61
  62 #define WAITACK         2       /* seconds */
  63 #define WAITDATEACK     5       /* seconds */
  64
  65 extern int retval;
  66
  67 /*
  68  * Set the date in the machines controlled by timedaemons by communicating the
  69  * new date to the local timedaemon.  If the timedaemon is in the master state,
  70  * it performs the correction on all slaves.  If it is in the slave state, it
  71  * notifies the master that a correction is needed.
  72  * Returns 0 on success.  Returns > 0 on failure, setting retval to 2;
  73  */
  74 int
  75 netsettime(tval)
  76         time_t tval;
  77 {
  78         struct timeval tout;
  79         struct servent *sp;
  80         struct tsp msg;
  81         struct sockaddr_in sin, dest, from;
  82         fd_set ready;
  83         long waittime;
  84         int s, length, timed_ack, found, error;
  85 #ifdef IP_PORTRANGE
  86         int on;
  87 #endif
  88         char hostname[MAXHOSTNAMELEN + 1];
  89
  90         if ((sp = getservbyname("timed", "udp")) == NULL) {
  91                 warnx("udp/timed: unknown service");
  92                 return (retval = 2);
  93         }
  94
  95         (void)memset(&dest, 0, sizeof(dest));
  96         dest.sin_len = sizeof(struct sockaddr_in);
  97         dest.sin_family = AF_INET;
  98         dest.sin_port = sp->s_port;
  99         dest.sin_addr.s_addr = htonl(INADDR_ANY);
 100         s = socket(AF_INET, SOCK_DGRAM, 0);
 101         if (s < 0) {
 102                 if (errno != EPROTONOSUPPORT)
 103                         warn("timed");
 104                 return (retval = 2);
 105         }
 106
 107 #ifdef IP_PORTRANGE
 108         on = IP_PORTRANGE_LOW;
 109         if (setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &on, sizeof(on)) < 0) {
 110                 warn("setsockopt");
 111                 goto bad;
 112         }
 113 #endif
 114
 115         (void)memset(&sin, 0, sizeof(sin));
 116         sin.sin_len = sizeof(struct sockaddr_in);
 117         sin.sin_family = AF_INET;
 118         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 119                 warn("bind");
 120                 goto bad;
 121         }
 122
 123         msg.tsp_type = TSP_SETDATE;
 124         msg.tsp_vers = TSPVERSION;
 125         if (gethostname(hostname, sizeof(hostname))) {
 126                 warn("gethostname");
 127                 goto bad;
 128         }
 129         hostname[sizeof(hostname) - 1] = '\0';
 130         (void)strncpy(msg.tsp_name, hostname, sizeof(hostname));
 131         msg.tsp_seq = htons((u_short)0);
 132         msg.tsp_time.tv_sec = htonl((u_long)tval);
 133         msg.tsp_time.tv_usec = htonl((u_long)0);
 134         length = sizeof(struct sockaddr_in);
 135         if (connect(s, (struct sockaddr *)&dest, length) < 0) {
 136                 warn("connect");
 137                 goto bad;
 138         }
 139         if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
 140                 if (errno != ECONNREFUSED)
 141                         warn("send");
 142                 goto bad;
 143         }
 144
 145         timed_ack = -1;
 146         waittime = WAITACK;
 147 loop:
 148         tout.tv_sec = waittime;
 149         tout.tv_usec = 0;
 150
 151         FD_ZERO(&ready);
 152         FD_SET(s, &ready);
 153         found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout);
 154
 155         length = sizeof(error);
 156         if (!getsockopt(s,
 157             SOL_SOCKET, SO_ERROR, (char *)&error, &length) && error) {
 158                 if (error != ECONNREFUSED)
 159                         warn("send (delayed error)");
 160                 goto bad;
 161         }
 162
 163         if (found > 0 && FD_ISSET(s, &ready)) {
 164                 length = sizeof(struct sockaddr_in);
 165                 if (recvfrom(s, &msg, sizeof(struct tsp), 0,
 166                     (struct sockaddr *)&from, &length) < 0) {
 167                         if (errno != ECONNREFUSED)
 168                                 warn("recvfrom");
 169                         goto bad;
 170                 }
 171                 msg.tsp_seq = ntohs(msg.tsp_seq);
 172                 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
 173                 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
 174                 switch (msg.tsp_type) {
 175                 case TSP_ACK:
 176                         timed_ack = TSP_ACK;
 177                         waittime = WAITDATEACK;
 178                         goto loop;
 179                 case TSP_DATEACK:
 180                         (void)close(s);
 181                         return (0);
 182                 default:
 183                         warnx("wrong ack received from timed: %s",
 184                             tsptype[msg.tsp_type]);
 185                         timed_ack = -1;
 186                         break;
 187                 }
 188         }
 189         if (timed_ack == -1)
 190                 warnx("can't reach time daemon, time set locally");
 191
 192 bad:
 193         (void)close(s);
 194         return (retval = 2);
 195 }