Remove __P macros from src/usr.bin and src/usr.sbin.
[dragonfly.git] / usr.sbin / rtsold / probe.c
CommitLineData
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1/* $KAME: probe.c,v 1.10 2000/08/13 06:14:59 itojun Exp $ */
2
3/*
4 * Copyright (C) 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD: src/usr.sbin/rtsold/probe.c,v 1.2.2.3 2001/07/03 11:02:16 ume Exp $
2d8a3be7 32 * $DragonFly: src/usr.sbin/rtsold/probe.c,v 1.3 2003/11/03 19:31:43 eirikn Exp $
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33 */
34
35#include <sys/param.h>
36#include <sys/types.h>
37#include <sys/ioctl.h>
38#include <sys/socket.h>
39#include <sys/uio.h>
40#include <sys/queue.h>
41
42#include <net/if.h>
43#if defined(__FreeBSD__) && __FreeBSD__ >= 3
44#include <net/if_var.h>
45#endif /* __FreeBSD__ >= 3 */
46
47#include <netinet/in.h>
48#include <netinet6/in6_var.h>
49#include <netinet/icmp6.h>
50#include <netinet6/nd6.h>
51
52#include <arpa/inet.h>
53
54#include <errno.h>
55#include <unistd.h>
56#include <string.h>
57#include <syslog.h>
58#include <stdlib.h>
59
60#include "rtsold.h"
61
62static struct msghdr sndmhdr;
63static struct iovec sndiov[2];
64static int probesock;
2d8a3be7 65static void sendprobe(struct in6_addr *addr, int ifindex);
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66
67
68int
69probe_init()
70{
71 int scmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
72 CMSG_SPACE(sizeof(int));
73 static u_char *sndcmsgbuf = NULL;
74
75 if (sndcmsgbuf == NULL &&
76 (sndcmsgbuf = (u_char *)malloc(scmsglen)) == NULL) {
77 warnmsg(LOG_ERR, __FUNCTION__, "malloc failed");
78 return(-1);
79 }
80
81 if ((probesock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) {
82 warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
83 return(-1);
84 }
85
86 /* make the socket send-only */
87 if (shutdown(probesock, 0)) {
88 warnmsg(LOG_ERR, __FUNCTION__, "shutdown: %s", strerror(errno));
89 return(-1);
90 }
91
92 /* initialize msghdr for sending packets */
93 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
94 sndmhdr.msg_iov = sndiov;
95 sndmhdr.msg_iovlen = 1;
96 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
97 sndmhdr.msg_controllen = scmsglen;
98
99 return(0);
100}
101
102/*
103 * Probe if each router in the default router list is still alive.
104 */
105void
106defrouter_probe(int ifindex)
107{
108 struct in6_drlist dr;
109 int s, i;
110 u_char ntopbuf[INET6_ADDRSTRLEN];
111
112 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
113 warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
114 return;
115 }
116 bzero(&dr, sizeof(dr));
117 strcpy(dr.ifname, "lo0"); /* dummy interface */
118 if (ioctl(s, SIOCGDRLST_IN6, (caddr_t)&dr) < 0) {
119 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGDRLST_IN6): %s",
120 strerror(errno));
121 goto closeandend;
122 }
123
124 for(i = 0; dr.defrouter[i].if_index && i < PRLSTSIZ; i++) {
125 if (ifindex && dr.defrouter[i].if_index == ifindex) {
126 /* sanity check */
127 if (!IN6_IS_ADDR_LINKLOCAL(&dr.defrouter[i].rtaddr)) {
128 warnmsg(LOG_ERR, __FUNCTION__,
129 "default router list contains a "
130 "non-linklocal address(%s)",
131 inet_ntop(AF_INET6,
132 &dr.defrouter[i].rtaddr,
133 ntopbuf, INET6_ADDRSTRLEN));
134 continue; /* ignore the address */
135 }
136 sendprobe(&dr.defrouter[i].rtaddr,
137 dr.defrouter[i].if_index);
138 }
139 }
140
141 closeandend:
142 close(s);
143 return;
144}
145
146static void
147sendprobe(struct in6_addr *addr, int ifindex)
148{
149 struct sockaddr_in6 sa6_probe;
150 struct in6_pktinfo *pi;
151 struct cmsghdr *cm;
152 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];;
153
154 bzero(&sa6_probe, sizeof(sa6_probe));
155 sa6_probe.sin6_family = AF_INET6;
156 sa6_probe.sin6_len = sizeof(sa6_probe);
157 sa6_probe.sin6_addr = *addr;
158
159 sndmhdr.msg_name = (caddr_t)&sa6_probe;
160 sndmhdr.msg_iov[0].iov_base = NULL;
161 sndmhdr.msg_iov[0].iov_len = 0;
162
163 cm = CMSG_FIRSTHDR(&sndmhdr);
164 /* specify the outgoing interface */
165 cm->cmsg_level = IPPROTO_IPV6;
166 cm->cmsg_type = IPV6_PKTINFO;
167 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
168 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
169 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
170 pi->ipi6_ifindex = ifindex;
171
172 /* specify the hop limit of the packet for safety */
173 {
174 int hoplimit = 1;
175
176 cm = CMSG_NXTHDR(&sndmhdr, cm);
177 cm->cmsg_level = IPPROTO_IPV6;
178 cm->cmsg_type = IPV6_HOPLIMIT;
179 cm->cmsg_len = CMSG_LEN(sizeof(int));
180 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
181 }
182
183 warnmsg(LOG_DEBUG, __FUNCTION__, "probe a router %s on %s",
184 inet_ntop(AF_INET6, addr, ntopbuf, INET6_ADDRSTRLEN),
185 if_indextoname(ifindex, ifnamebuf));
186
187 if (sendmsg(probesock, &sndmhdr, 0))
188 warnmsg(LOG_ERR, __FUNCTION__, "sendmsg on %s: %s",
189 if_indextoname(ifindex, ifnamebuf), strerror(errno));
190
191 return;
192}