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 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
  60 static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
  61 #endif
  62
  63 static struct {
  64         u_char type;
  65         size_t minlen;
  66         int (*func)(int, struct rt_msghdr *, char *);
  67 } rtsock_dispatch[] = {
  68 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
  69         { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
  70           rtsock_input_ifannounce },
  71 #endif
  72         { 0, 0, NULL },
  73 };
  74
  75 int
  76 rtsock_open(void)
  77 {
  78
  79         return socket(PF_ROUTE, SOCK_RAW, 0);
  80 }
  81
  82 int
  83 rtsock_input(int s)
  84 {
  85         ssize_t n;
  86         char msg[2048];
  87         char *lim, *next;
  88         struct rt_msghdr *rtm;
  89         int idx;
  90         ssize_t len;
  91         int ret = 0;
  92         const ssize_t lenlim =
  93             offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
  94
  95         n = read(s, msg, sizeof(msg));
  96
  97         lim = msg + n;
  98         for (next = msg; next < lim; next += len) {
  99                 rtm = (struct rt_msghdr *)next;
 100                 if (lim - next < lenlim)
 101                         break;
 102                 len = rtm->rtm_msglen;
 103                 if (len < lenlim)
 104                         break;
 105
 106                 if (dflag > 1) {
 107                         warnmsg(LOG_INFO, __func__,
 108                             "rtmsg type %d, len=%lu", rtm->rtm_type,
 109                             (u_long)len);
 110                 }
 111
 112                 for (idx = 0; rtsock_dispatch[idx].func; idx++) {
 113                         if (rtm->rtm_type != rtsock_dispatch[idx].type)
 114                                 continue;
 115                         if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
 116                                 warnmsg(LOG_INFO, __func__,
 117                                     "rtmsg type %d too short!", rtm->rtm_type);
 118                                 continue;
 119                         }
 120
 121                         ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
 122                         break;
 123                 }
 124         }
 125
 126         return ret;
 127 }
 128
 129 #ifdef RTM_IFANNOUNCE   /*NetBSD 1.5 or later*/
 130 static int
 131 rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
 132 {
 133         struct if_announcemsghdr *ifan;
 134         struct ifinfo *ifinfo;
 135
 136         ifan = (struct if_announcemsghdr *)rtm;
 137         if ((char *)(ifan + 1) > lim)
 138                 return -1;
 139
 140         switch (ifan->ifan_what) {
 141         case IFAN_ARRIVAL:
 142                 /*
 143                  * XXX for NetBSD 1.5, interface index will monotonically be
 144                  * increased as new pcmcia card gets inserted.
 145                  * we may be able to do a name-based interface match,
 146                  * and call ifreconfig() to enable the interface again.
 147                  */
 148                 warnmsg(LOG_INFO, __func__,
 149                     "interface %s inserted", ifan->ifan_name);
 150                 break;
 151         case IFAN_DEPARTURE:
 152                 warnmsg(LOG_WARNING, __func__,
 153                     "interface %s removed", ifan->ifan_name);
 154                 ifinfo = find_ifinfo(ifan->ifan_index);
 155                 if (ifinfo) {
 156                         if (dflag > 1) {
 157                                 warnmsg(LOG_INFO, __func__,
 158                                     "bring interface %s to DOWN state",
 159                                     ifan->ifan_name);
 160                         }
 161                         ifinfo->state = IFS_DOWN;
 162                 }
 163                 break;
 164         }
 165
 166         return 0;
 167 }
 168 #endif