/* $KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $ */
/* $FreeBSD$ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 2000 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <capsicum_helpers.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <stddef.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include "rtsold.h"
static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
static struct {
u_char type;
size_t minlen;
int (*func)(int, struct rt_msghdr *, char *);
} rtsock_dispatch[] = {
{ RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
rtsock_input_ifannounce },
{ 0, 0, NULL },
};
int
rtsock_open(void)
{
cap_rights_t rights;
int error, s;
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0)
return (s);
cap_rights_init(&rights, CAP_EVENT, CAP_READ);
if (caph_rights_limit(s, &rights) != 0) {
error = errno;
(void)close(s);
errno = error;
return (-1);
}
return (s);
}
int
rtsock_input(int s)
{
ssize_t n;
char msg[2048];
char *lim, *next;
struct rt_msghdr *rtm;
int idx;
ssize_t len;
int ret = 0;
const ssize_t lenlim =
offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
n = read(s, msg, sizeof(msg));
lim = msg + n;
for (next = msg; next < lim; next += len) {
rtm = (struct rt_msghdr *)(void *)next;
if (lim - next < lenlim)
break;
len = rtm->rtm_msglen;
if (len < lenlim)
break;
if (dflag > 1) {
warnmsg(LOG_INFO, __func__,
"rtmsg type %d, len=%lu", rtm->rtm_type,
(u_long)len);
}
for (idx = 0; rtsock_dispatch[idx].func; idx++) {
if (rtm->rtm_type != rtsock_dispatch[idx].type)
continue;
if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
warnmsg(LOG_INFO, __func__,
"rtmsg type %d too short!", rtm->rtm_type);
continue;
}
ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
break;
}
}
return (ret);
}
static int
rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
{
struct if_announcemsghdr *ifan;
struct ifinfo *ifi;
ifan = (struct if_announcemsghdr *)rtm;
if ((char *)(ifan + 1) > lim)
return (-1);
switch (ifan->ifan_what) {
case IFAN_ARRIVAL:
/*
* XXX for NetBSD 1.5, interface index will monotonically be
* increased as new pcmcia card gets inserted.
* we may be able to do a name-based interface match,
* and call ifreconfig() to enable the interface again.
*/
warnmsg(LOG_INFO, __func__,
"interface %s inserted", ifan->ifan_name);
break;
case IFAN_DEPARTURE:
warnmsg(LOG_WARNING, __func__,
"interface %s removed", ifan->ifan_name);
ifi = find_ifinfo(ifan->ifan_index);
if (ifi) {
if (dflag > 1) {
warnmsg(LOG_INFO, __func__,
"bring interface %s to DOWN state",
ifan->ifan_name);
}
ifi->state = IFS_DOWN;
}
break;
}
return (0);
}
