usr.sbin/rtsold/rtsock.c

   1 /*      $NetBSD: rtsock.c,v 1.5 2004/01/03 01:40:32 itojun Exp $        */
   2 /*      $KAME: rtsock.c,v 1.4 2001/09/19 06:59:41 sakane Exp $  */
   3
   4 /*
   5  * Copyright (C) 2000 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <sys/uio.h>
  36 #include <sys/time.h>
  37 #include <sys/queue.h>
  38
  39 #include <net/if.h>
  40 #include <net/route.h>
  41 #include <net/if_dl.h>
  42
  43 #include <netinet/in.h>
  44 #include <netinet/ip6.h>
  45 #include <netinet/icmp6.h>
  46
  47 #include <time.h>
  48 #include <unistd.h>
  49 #include <stdio.h>
  50 #include <stddef.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <string.h>
  54 #include <stdlib.h>
  55 #include <syslog.h>
  56 #include "rtsold.h"
  57
  58 #define ROUNDUP(a, size) \
  59         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
  60
  61 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
  62         ((caddr_t)(ap) + \
  63          ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) \
  64                        : sizeof(u_long)))
  65
  66 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
  67 static int rtsock_input_ifannounce __P((int, struct rt_msghdr *, char *));
  68 #endif
  69
  70 static struct {
  71         u_char type;
  72         size_t minlen;
  73         int (*func) __P((int, struct rt_msghdr *, char *));
  74 } rtsock_dispatch[] = {
  75 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
  76         { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
  77           rtsock_input_ifannounce },
  78 #endif
  79         { 0, 0, NULL },
  80 };
  81
  82 int
  83 rtsock_open(void)
  84 {
  85
  86         return socket(PF_ROUTE, SOCK_RAW, 0);
  87 }
  88
  89 int
  90 rtsock_input(int s)
  91 {
  92         ssize_t n;
  93         char msg[2048];
  94         char *lim, *next;
  95         struct rt_msghdr *rtm;
  96         int idx;
  97         size_t len;
  98         int ret = 0;
  99         const size_t lenlim =
 100             offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
 101
 102         n = read(s, msg, sizeof(msg));
 103
 104         lim = msg + n;
 105         for (next = msg; next < lim; next += len) {
 106                 rtm = (struct rt_msghdr *)next;
 107                 if (lim - next < (intptr_t)lenlim)
 108                         break;
 109                 len = rtm->rtm_msglen;
 110                 if (len < lenlim)
 111                         break;
 112
 113                 if (dflag > 1) {
 114                         warnmsg(LOG_INFO, __func__,
 115                             "rtmsg type %d, len=%lu", rtm->rtm_type,
 116                             (u_long)len);
 117                 }
 118
 119                 for (idx = 0; rtsock_dispatch[idx].func; idx++) {
 120                         if (rtm->rtm_type != rtsock_dispatch[idx].type)
 121                                 continue;
 122                         if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
 123                                 warnmsg(LOG_INFO, __func__,
 124                                     "rtmsg type %d too short!", rtm->rtm_type);
 125                                 continue;
 126                         }
 127
 128                         ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
 129                         break;
 130                 }
 131         }
 132
 133         return ret;
 134 }
 135
 136 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
 137 static int
 138 rtsock_input_ifannounce(int s, struct rt_msghdr *rtm, char *lim)
 139 {
 140         struct if_announcemsghdr *ifan;
 141         struct ifinfo *ifinfo;
 142
 143         ifan = (struct if_announcemsghdr *)rtm;
 144         if ((char *)(ifan + 1) > lim)
 145                 return -1;
 146
 147         switch (ifan->ifan_what) {
 148         case IFAN_ARRIVAL:
 149                 /*
 150                  * XXX for NetBSD 1.5, interface index will monotonically be
 151                  * increased as new pcmcia card gets inserted.
 152                  * we may be able to do a name-based interface match,
 153                  * and call ifreconfig() to enable the interface again.
 154                  */
 155                 warnmsg(LOG_INFO, __func__,
 156                     "interface %s inserted", ifan->ifan_name);
 157                 break;
 158         case IFAN_DEPARTURE:
 159                 warnmsg(LOG_WARNING, __func__,
 160                     "interface %s removed", ifan->ifan_name);
 161                 ifinfo = find_ifinfo(ifan->ifan_index);
 162                 if (ifinfo) {
 163                         if (dflag > 1) {
 164                                 warnmsg(LOG_INFO, __func__,
 165                                     "bring interface %s to DOWN state",
 166                                     ifan->ifan_name);
 167                         }
 168                         ifinfo->state = IFS_DOWN;
 169                 }
 170                 break;
 171         }
 172
 173         return 0;
 174 }
 175 #endif