af_inet.c revision 138593 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char rcsid[] =
32  "$FreeBSD: head/sbin/ifconfig/af_inet.c 138593 2004-12-08 19:18:07Z sam $";
33#endif /* not lint */
34
35#include <sys/types.h>
36#include <sys/ioctl.h>
37#include <sys/socket.h>
38#include <net/if.h>
39#include <net/route.h>		/* for RTX_IFA */
40
41#include <err.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47#include <netinet/in.h>
48#include <net/if_var.h>		/* for struct ifaddr */
49#include <netinet/in_var.h>
50#include <arpa/inet.h>
51#include <netdb.h>
52
53#include "ifconfig.h"
54
55static struct ifaliasreq in_addreq;
56static struct ifreq in_ridreq;
57
58static void
59in_status(int s __unused, const struct rt_addrinfo * info)
60{
61	struct sockaddr_in *sin, null_sin;
62
63	memset(&null_sin, 0, sizeof(null_sin));
64
65	sin = (struct sockaddr_in *)info->rti_info[RTAX_IFA];
66	if (sin == NULL)
67		return;
68
69	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
70
71	if (flags & IFF_POINTOPOINT) {
72		/* note RTAX_BRD overlap with IFF_BROADCAST */
73		sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
74		if (!sin)
75			sin = &null_sin;
76		printf("--> %s ", inet_ntoa(sin->sin_addr));
77	}
78
79	sin = (struct sockaddr_in *)info->rti_info[RTAX_NETMASK];
80	if (!sin)
81		sin = &null_sin;
82	printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
83
84	if (flags & IFF_BROADCAST) {
85		/* note RTAX_BRD overlap with IFF_POINTOPOINT */
86		sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
87		if (sin && sin->sin_addr.s_addr != 0)
88			printf("broadcast %s", inet_ntoa(sin->sin_addr));
89	}
90	putchar('\n');
91}
92
93#define SIN(x) ((struct sockaddr_in *) &(x))
94static struct sockaddr_in *sintab[] = {
95	SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
96	SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
97};
98
99static void
100in_getaddr(const char *s, int which)
101{
102#define	MIN(a,b)	((a)<(b)?(a):(b))
103	struct sockaddr_in *sin = sintab[which];
104	struct hostent *hp;
105	struct netent *np;
106
107	sin->sin_len = sizeof(*sin);
108	if (which != MASK)
109		sin->sin_family = AF_INET;
110
111	if (which == ADDR) {
112		char *p = NULL;
113
114		if((p = strrchr(s, '/')) != NULL) {
115			/* address is `name/masklen' */
116			int masklen;
117			int ret;
118			struct sockaddr_in *min = sintab[MASK];
119			*p = '\0';
120			ret = sscanf(p+1, "%u", &masklen);
121			if(ret != 1 || (masklen < 0 || masklen > 32)) {
122				*p = '/';
123				errx(1, "%s: bad value", s);
124			}
125			min->sin_len = sizeof(*min);
126			min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
127				              0xffffffff);
128		}
129	}
130
131	if (inet_aton(s, &sin->sin_addr))
132		return;
133	if ((hp = gethostbyname(s)) != 0)
134		bcopy(hp->h_addr, (char *)&sin->sin_addr,
135		    MIN(hp->h_length, sizeof(sin->sin_addr)));
136	else if ((np = getnetbyname(s)) != 0)
137		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
138	else
139		errx(1, "%s: bad value", s);
140#undef MIN
141}
142
143static void
144in_status_tunnel(int s)
145{
146	char src[NI_MAXHOST];
147	char dst[NI_MAXHOST];
148	struct ifreq ifr;
149	const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
150
151	memset(&ifr, 0, sizeof(ifr));
152	strncpy(ifr.ifr_name, name, IFNAMSIZ);
153
154	if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
155		return;
156	if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
157		src[0] = '\0';
158
159	if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
160		return;
161	if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
162		dst[0] = '\0';
163
164	printf("\ttunnel inet %s --> %s\n", src, dst);
165}
166
167static void
168in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
169{
170	struct ifaliasreq addreq;
171
172	memset(&addreq, 0, sizeof(addreq));
173	strncpy(addreq.ifra_name, name, IFNAMSIZ);
174	memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
175	memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
176
177	if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
178		warn("SIOCSIFPHYADDR");
179}
180
181static struct afswtch af_inet = {
182	.af_name	= "inet",
183	.af_af		= AF_INET,
184	.af_status	= in_status,
185	.af_getaddr	= in_getaddr,
186	.af_status_tunnel = in_status_tunnel,
187	.af_settunnel	= in_set_tunnel,
188	.af_difaddr	= SIOCDIFADDR,
189	.af_aifaddr	= SIOCAIFADDR,
190	.af_ridreq	= &in_ridreq,
191	.af_addreq	= &in_addreq,
192};
193
194static __constructor void
195inet_ctor(void)
196{
197	af_register(&af_inet);
198}
199