xref: /freebsd/sbin/ifconfig/af_inet.c (revision 952364486a4b9d135e4b28f7f88a8703a74eae6f)
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
31 static const char rcsid[] =
32   "$FreeBSD$";
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 
40 #include <ctype.h>
41 #include <err.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 #include <ifaddrs.h>
47 
48 #include <netinet/in.h>
49 #include <netinet/in_var.h>
50 #include <arpa/inet.h>
51 #include <netdb.h>
52 
53 #include "ifconfig.h"
54 
55 static struct in_aliasreq in_addreq;
56 static struct ifreq in_ridreq;
57 
58 static void
59 in_status(int s __unused, const struct ifaddrs *ifa)
60 {
61 	struct sockaddr_in *sin, null_sin;
62 
63 	memset(&null_sin, 0, sizeof(null_sin));
64 
65 	sin = (struct sockaddr_in *)ifa->ifa_addr;
66 	if (sin == NULL)
67 		return;
68 
69 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
70 
71 	if (ifa->ifa_flags & IFF_POINTOPOINT) {
72 		sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
73 		if (sin == NULL)
74 			sin = &null_sin;
75 		printf("--> %s ", inet_ntoa(sin->sin_addr));
76 	}
77 
78 	sin = (struct sockaddr_in *)ifa->ifa_netmask;
79 	if (sin == NULL)
80 		sin = &null_sin;
81 	printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
82 
83 	if (ifa->ifa_flags & IFF_BROADCAST) {
84 		sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
85 		if (sin != NULL && sin->sin_addr.s_addr != 0)
86 			printf("broadcast %s ", inet_ntoa(sin->sin_addr));
87 	}
88 
89 	print_vhid(ifa, " ");
90 
91 	putchar('\n');
92 }
93 
94 #define SIN(x) ((struct sockaddr_in *) &(x))
95 static struct sockaddr_in *sintab[] = {
96 	SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
97 	SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
98 };
99 
100 static void
101 in_getaddr(const char *s, int which)
102 {
103 #define	MIN(a,b)	((a)<(b)?(a):(b))
104 	struct sockaddr_in *sin = sintab[which];
105 	struct hostent *hp;
106 	struct netent *np;
107 
108 	sin->sin_len = sizeof(*sin);
109 	sin->sin_family = AF_INET;
110 
111 	if (which == ADDR) {
112 		char *p = NULL;
113 
114 		if((p = strrchr(s, '/')) != NULL) {
115 			const char *errstr;
116 			/* address is `name/masklen' */
117 			int masklen;
118 			struct sockaddr_in *min = sintab[MASK];
119 			*p = '\0';
120 			if (!isdigit(*(p + 1)))
121 				errstr = "invalid";
122 			else
123 				masklen = (int)strtonum(p + 1, 0, 32, &errstr);
124 			if (errstr != NULL) {
125 				*p = '/';
126 				errx(1, "%s: bad value (width %s)", s, errstr);
127 			}
128 			min->sin_family = AF_INET;
129 			min->sin_len = sizeof(*min);
130 			min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
131 				              0xffffffff);
132 		}
133 	}
134 
135 	if (inet_aton(s, &sin->sin_addr))
136 		return;
137 	if ((hp = gethostbyname(s)) != 0)
138 		bcopy(hp->h_addr, (char *)&sin->sin_addr,
139 		    MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
140 	else if ((np = getnetbyname(s)) != 0)
141 		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
142 	else
143 		errx(1, "%s: bad value", s);
144 #undef MIN
145 }
146 
147 static void
148 in_status_tunnel(int s)
149 {
150 	char src[NI_MAXHOST];
151 	char dst[NI_MAXHOST];
152 	struct ifreq ifr;
153 	const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
154 
155 	memset(&ifr, 0, sizeof(ifr));
156 	strncpy(ifr.ifr_name, name, IFNAMSIZ);
157 
158 	if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
159 		return;
160 	if (sa->sa_family != AF_INET)
161 		return;
162 	if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
163 		src[0] = '\0';
164 
165 	if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
166 		return;
167 	if (sa->sa_family != AF_INET)
168 		return;
169 	if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
170 		dst[0] = '\0';
171 
172 	printf("\ttunnel inet %s --> %s\n", src, dst);
173 }
174 
175 static void
176 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
177 {
178 	struct in_aliasreq addreq;
179 
180 	memset(&addreq, 0, sizeof(addreq));
181 	strncpy(addreq.ifra_name, name, IFNAMSIZ);
182 	memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
183 	memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
184 
185 	if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
186 		warn("SIOCSIFPHYADDR");
187 }
188 
189 static struct afswtch af_inet = {
190 	.af_name	= "inet",
191 	.af_af		= AF_INET,
192 	.af_status	= in_status,
193 	.af_getaddr	= in_getaddr,
194 	.af_status_tunnel = in_status_tunnel,
195 	.af_settunnel	= in_set_tunnel,
196 	.af_difaddr	= SIOCDIFADDR,
197 	.af_aifaddr	= SIOCAIFADDR,
198 	.af_ridreq	= &in_ridreq,
199 	.af_addreq	= &in_addreq,
200 };
201 
202 static __constructor void
203 inet_ctor(void)
204 {
205 
206 #ifndef RESCUE
207 	if (!feature_present("inet"))
208 		return;
209 #endif
210 	af_register(&af_inet);
211 }
212