1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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
32 #ifndef lint
33 static const char rcsid[] =
34 "$FreeBSD: stable/12/sbin/ifconfig/af_inet.c 345357 2019-03-21 00:17:43Z asomers $";
35 #endif /* not lint */
36
37 #include <sys/param.h>
38 #include <sys/ioctl.h>
39 #include <sys/socket.h>
40 #include <net/if.h>
41
42 #include <ctype.h>
43 #include <err.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <unistd.h>
48 #include <ifaddrs.h>
49
50 #include <netinet/in.h>
51 #include <netinet/in_var.h>
52 #include <arpa/inet.h>
53 #include <netdb.h>
54
55 #include "ifconfig.h"
56
57 static struct in_aliasreq in_addreq;
58 static struct ifreq in_ridreq;
59 static char addr_buf[NI_MAXHOST]; /*for getnameinfo()*/
60 extern char *f_inet, *f_addr;
61
62 static void
in_status(int s __unused,const struct ifaddrs * ifa)63 in_status(int s __unused, const struct ifaddrs *ifa)
64 {
65 struct sockaddr_in *sin, null_sin;
66 int error, n_flags;
67
68 memset(&null_sin, 0, sizeof(null_sin));
69
70 sin = (struct sockaddr_in *)ifa->ifa_addr;
71 if (sin == NULL)
72 return;
73
74 if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
75 n_flags = 0;
76 else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
77 n_flags = NI_NOFQDN;
78 else
79 n_flags = NI_NUMERICHOST;
80
81 error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf,
82 sizeof(addr_buf), NULL, 0, n_flags);
83
84 if (error)
85 inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf));
86
87 printf("\tinet %s", addr_buf);
88
89 if (ifa->ifa_flags & IFF_POINTOPOINT) {
90 sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
91 if (sin == NULL)
92 sin = &null_sin;
93 printf(" --> %s", inet_ntoa(sin->sin_addr));
94 }
95
96 sin = (struct sockaddr_in *)ifa->ifa_netmask;
97 if (sin == NULL)
98 sin = &null_sin;
99 if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) {
100 int cidr = 32;
101 unsigned long smask;
102
103 smask = ntohl(sin->sin_addr.s_addr);
104 while ((smask & 1) == 0) {
105 smask = smask >> 1;
106 cidr--;
107 if (cidr == 0)
108 break;
109 }
110 printf("/%d", cidr);
111 } else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0)
112 printf(" netmask %s", inet_ntoa(sin->sin_addr));
113 else
114 printf(" netmask 0x%lx", (unsigned long)ntohl(sin->sin_addr.s_addr));
115
116 if (ifa->ifa_flags & IFF_BROADCAST) {
117 sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
118 if (sin != NULL && sin->sin_addr.s_addr != 0)
119 printf(" broadcast %s", inet_ntoa(sin->sin_addr));
120 }
121
122 print_vhid(ifa, " ");
123
124 putchar('\n');
125 }
126
127 #define SIN(x) ((struct sockaddr_in *) &(x))
128 static struct sockaddr_in *sintab[] = {
129 SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
130 SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
131 };
132
133 static void
in_getaddr(const char * s,int which)134 in_getaddr(const char *s, int which)
135 {
136 struct sockaddr_in *sin = sintab[which];
137 struct hostent *hp;
138 struct netent *np;
139
140 sin->sin_len = sizeof(*sin);
141 sin->sin_family = AF_INET;
142
143 if (which == ADDR) {
144 char *p = NULL;
145
146 if((p = strrchr(s, '/')) != NULL) {
147 const char *errstr;
148 /* address is `name/masklen' */
149 int masklen;
150 struct sockaddr_in *min = sintab[MASK];
151 *p = '\0';
152 if (!isdigit(*(p + 1)))
153 errstr = "invalid";
154 else
155 masklen = (int)strtonum(p + 1, 0, 32, &errstr);
156 if (errstr != NULL) {
157 *p = '/';
158 errx(1, "%s: bad value (width %s)", s, errstr);
159 }
160 min->sin_family = AF_INET;
161 min->sin_len = sizeof(*min);
162 min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
163 0xffffffff);
164 }
165 }
166
167 if (inet_aton(s, &sin->sin_addr))
168 return;
169 if ((hp = gethostbyname(s)) != NULL)
170 bcopy(hp->h_addr, (char *)&sin->sin_addr,
171 MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
172 else if ((np = getnetbyname(s)) != NULL)
173 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
174 else
175 errx(1, "%s: bad value", s);
176 }
177
178 static void
in_status_tunnel(int s)179 in_status_tunnel(int s)
180 {
181 char src[NI_MAXHOST];
182 char dst[NI_MAXHOST];
183 struct ifreq ifr;
184 const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
185
186 memset(&ifr, 0, sizeof(ifr));
187 strlcpy(ifr.ifr_name, name, IFNAMSIZ);
188
189 if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
190 return;
191 if (sa->sa_family != AF_INET)
192 return;
193 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
194 src[0] = '\0';
195
196 if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
197 return;
198 if (sa->sa_family != AF_INET)
199 return;
200 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
201 dst[0] = '\0';
202
203 printf("\ttunnel inet %s --> %s\n", src, dst);
204 }
205
206 static void
in_set_tunnel(int s,struct addrinfo * srcres,struct addrinfo * dstres)207 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
208 {
209 struct in_aliasreq addreq;
210
211 memset(&addreq, 0, sizeof(addreq));
212 strlcpy(addreq.ifra_name, name, IFNAMSIZ);
213 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
214 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
215
216 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
217 warn("SIOCSIFPHYADDR");
218 }
219
220 static struct afswtch af_inet = {
221 .af_name = "inet",
222 .af_af = AF_INET,
223 .af_status = in_status,
224 .af_getaddr = in_getaddr,
225 .af_status_tunnel = in_status_tunnel,
226 .af_settunnel = in_set_tunnel,
227 .af_difaddr = SIOCDIFADDR,
228 .af_aifaddr = SIOCAIFADDR,
229 .af_ridreq = &in_ridreq,
230 .af_addreq = &in_addreq,
231 };
232
233 static __constructor void
inet_ctor(void)234 inet_ctor(void)
235 {
236
237 #ifndef RESCUE
238 if (!feature_present("inet"))
239 return;
240 #endif
241 af_register(&af_inet);
242 }
243