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 169