xref: /freebsd/sbin/ifconfig/af_inet.c (revision 792bbaba989533a1fc93823df1720c8c4aaf0442)
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/param.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 static char addr_buf[NI_MAXHOST];	/*for getnameinfo()*/
58 extern char *f_inet, *f_addr;
59 
60 static void
61 in_status(int s __unused, const struct ifaddrs *ifa)
62 {
63 	struct sockaddr_in *sin, null_sin;
64 	int error, n_flags;
65 
66 	memset(&null_sin, 0, sizeof(null_sin));
67 
68 	sin = (struct sockaddr_in *)ifa->ifa_addr;
69 	if (sin == NULL)
70 		return;
71 
72 	if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
73 		n_flags = 0;
74 	else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
75 		n_flags = NI_NOFQDN;
76 	else
77 		n_flags = NI_NUMERICHOST;
78 
79 	error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf,
80 			    sizeof(addr_buf), NULL, 0, n_flags);
81 
82 	if (error)
83 		inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf));
84 
85 	printf("\tinet %s", addr_buf);
86 
87 	if (ifa->ifa_flags & IFF_POINTOPOINT) {
88 		sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
89 		if (sin == NULL)
90 			sin = &null_sin;
91 		printf(" --> %s", inet_ntoa(sin->sin_addr));
92 	}
93 
94 	sin = (struct sockaddr_in *)ifa->ifa_netmask;
95 	if (sin == NULL)
96 		sin = &null_sin;
97 	if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) {
98 		int cidr = 32;
99 		unsigned long smask;
100 
101 		smask = ntohl(sin->sin_addr.s_addr);
102 		while ((smask & 1) == 0) {
103 			smask = smask >> 1;
104 			cidr--;
105 			if (cidr == 0)
106 				break;
107 		}
108 		printf("/%d ", cidr);
109 	} else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0)
110 		printf(" netmask %s ", inet_ntoa(sin->sin_addr));
111 	else
112 		printf(" netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
113 
114 	if (ifa->ifa_flags & IFF_BROADCAST) {
115 		sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
116 		if (sin != NULL && sin->sin_addr.s_addr != 0)
117 			printf("broadcast %s ", inet_ntoa(sin->sin_addr));
118 	}
119 
120 	print_vhid(ifa, " ");
121 
122 	putchar('\n');
123 }
124 
125 #define SIN(x) ((struct sockaddr_in *) &(x))
126 static struct sockaddr_in *sintab[] = {
127 	SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
128 	SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
129 };
130 
131 static void
132 in_getaddr(const char *s, int which)
133 {
134 	struct sockaddr_in *sin = sintab[which];
135 	struct hostent *hp;
136 	struct netent *np;
137 
138 	sin->sin_len = sizeof(*sin);
139 	sin->sin_family = AF_INET;
140 
141 	if (which == ADDR) {
142 		char *p = NULL;
143 
144 		if((p = strrchr(s, '/')) != NULL) {
145 			const char *errstr;
146 			/* address is `name/masklen' */
147 			int masklen;
148 			struct sockaddr_in *min = sintab[MASK];
149 			*p = '\0';
150 			if (!isdigit(*(p + 1)))
151 				errstr = "invalid";
152 			else
153 				masklen = (int)strtonum(p + 1, 0, 32, &errstr);
154 			if (errstr != NULL) {
155 				*p = '/';
156 				errx(1, "%s: bad value (width %s)", s, errstr);
157 			}
158 			min->sin_family = AF_INET;
159 			min->sin_len = sizeof(*min);
160 			min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
161 				              0xffffffff);
162 		}
163 	}
164 
165 	if (inet_aton(s, &sin->sin_addr))
166 		return;
167 	if ((hp = gethostbyname(s)) != NULL)
168 		bcopy(hp->h_addr, (char *)&sin->sin_addr,
169 		    MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
170 	else if ((np = getnetbyname(s)) != NULL)
171 		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
172 	else
173 		errx(1, "%s: bad value", s);
174 }
175 
176 static void
177 in_status_tunnel(int s)
178 {
179 	char src[NI_MAXHOST];
180 	char dst[NI_MAXHOST];
181 	struct ifreq ifr;
182 	const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
183 
184 	memset(&ifr, 0, sizeof(ifr));
185 	strlcpy(ifr.ifr_name, name, IFNAMSIZ);
186 
187 	if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
188 		return;
189 	if (sa->sa_family != AF_INET)
190 		return;
191 	if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
192 		src[0] = '\0';
193 
194 	if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
195 		return;
196 	if (sa->sa_family != AF_INET)
197 		return;
198 	if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
199 		dst[0] = '\0';
200 
201 	printf("\ttunnel inet %s --> %s\n", src, dst);
202 }
203 
204 static void
205 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
206 {
207 	struct in_aliasreq addreq;
208 
209 	memset(&addreq, 0, sizeof(addreq));
210 	strlcpy(addreq.ifra_name, name, IFNAMSIZ);
211 	memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
212 	memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
213 
214 	if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
215 		warn("SIOCSIFPHYADDR");
216 }
217 
218 static struct afswtch af_inet = {
219 	.af_name	= "inet",
220 	.af_af		= AF_INET,
221 	.af_status	= in_status,
222 	.af_getaddr	= in_getaddr,
223 	.af_status_tunnel = in_status_tunnel,
224 	.af_settunnel	= in_set_tunnel,
225 	.af_difaddr	= SIOCDIFADDR,
226 	.af_aifaddr	= SIOCAIFADDR,
227 	.af_ridreq	= &in_ridreq,
228 	.af_addreq	= &in_addreq,
229 };
230 
231 static __constructor void
232 inet_ctor(void)
233 {
234 
235 #ifndef RESCUE
236 	if (!feature_present("inet"))
237 		return;
238 #endif
239 	af_register(&af_inet);
240 }
241