usr.sbin/rtsold/rtsock.c

   1 /*      $KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $  */
   2 /*      $FreeBSD: src/usr.sbin/rtsold/rtsock.c,v 1.1.2.1 2001/07/03 11:02:16 ume Exp $  */
   3 /*      $DragonFly: src/usr.sbin/rtsold/rtsock.c,v 1.6 2005/12/05 00:56:37 swildner Exp $       */
   4
   5 /*
   6  * Copyright (C) 2000 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/socket.h>
  36 #include <sys/uio.h>
  37 #include <sys/time.h>
  38 #include <sys/queue.h>
  39
  40 #include <net/if.h>
  41 #include <net/route.h>
  42 #include <net/if_dl.h>
  43
  44 #include <netinet/in.h>
  45 #include <netinet/ip6.h>
  46 #include <netinet/icmp6.h>
  47
  48 #include <time.h>
  49 #include <unistd.h>
  50 #include <stdio.h>
  51 #include <stddef.h>
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <string.h>
  55 #include <stdlib.h>
  56 #include <syslog.h>
  57 #include "rtsold.h"
  58
  59 #define ROUNDUP(a, size) \
  60         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
  61
  62 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
  63         ((caddr_t)(ap) + \
  64          ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) \
  65                        : sizeof(u_long)))
  66
  67 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
  68 static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
  69 #endif
  70
  71 static struct {
  72         u_char type;
  73         size_t minlen;
  74         int (*func)(int, struct rt_msghdr *, char *);
  75 } rtsock_dispatch[] = {
  76 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
  77         { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
  78           rtsock_input_ifannounce },
  79 #endif
  80         { 0, 0, NULL },
  81 };
  82
  83 int
  84 rtsock_open(void)
  85 {
  86
  87         return socket(PF_ROUTE, SOCK_RAW, 0);
  88 }
  89
  90 int
  91 rtsock_input(int s)
  92 {
  93         ssize_t n;
  94         char msg[2048];
  95         char *lim, *next;
  96         struct rt_msghdr *rtm;
  97         int idx;
  98         ssize_t len;
  99         int ret = 0;
 100         const ssize_t lenlim =
 101             offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
 102
 103         n = read(s, msg, sizeof(msg));
 104
 105         lim = msg + n;
 106         for (next = msg; next < lim; next += len) {
 107                 rtm = (struct rt_msghdr *)next;
 108                 if (lim - next < lenlim)
 109                         break;
 110                 len = rtm->rtm_msglen;
 111                 if (len < lenlim)
 112                         break;
 113
 114                 if (dflag > 1) {
 115                         warnmsg(LOG_INFO, __func__,
 116                             "rtmsg type %d, len=%lu", rtm->rtm_type,
 117                             (u_long)len);
 118                 }
 119
 120                 for (idx = 0; rtsock_dispatch[idx].func; idx++) {
 121                         if (rtm->rtm_type != rtsock_dispatch[idx].type)
 122                                 continue;
 123                         if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
 124                                 warnmsg(LOG_INFO, __func__,
 125                                     "rtmsg type %d too short!", rtm->rtm_type);
 126                                 continue;
 127                         }
 128
 129                         ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
 130                         break;
 131                 }
 132         }
 133
 134         return ret;
 135 }
 136
 137 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
 138 static int
 139 rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
 140 {
 141         struct if_announcemsghdr *ifan;
 142         struct ifinfo *ifinfo;
 143
 144         ifan = (struct if_announcemsghdr *)rtm;
 145         if ((char *)(ifan + 1) > lim)
 146                 return -1;
 147
 148         switch (ifan->ifan_what) {
 149         case IFAN_ARRIVAL:
 150                 /*
 151                  * XXX for NetBSD 1.5, interface index will monotonically be
 152                  * increased as new pcmcia card gets inserted.
 153                  * we may be able to do a name-based interface match,
 154                  * and call ifreconfig() to enable the interface again.
 155                  */
 156                 warnmsg(LOG_INFO, __func__,
 157                     "interface %s inserted", ifan->ifan_name);
 158                 break;
 159         case IFAN_DEPARTURE:
 160                 warnmsg(LOG_WARNING, __func__,
 161                     "interface %s removed", ifan->ifan_name);
 162                 ifinfo = find_ifinfo(ifan->ifan_index);
 163                 if (ifinfo) {
 164                         if (dflag > 1) {
 165                                 warnmsg(LOG_INFO, __func__,
 166                                     "bring interface %s to DOWN state",
 167                                     ifan->ifan_name);
 168                         }
 169                         ifinfo->state = IFS_DOWN;
 170                 }
 171                 break;
 172         }
 173
 174         return 0;
 175 }
 176 #endif