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: stable/9/sbin/ifconfig/af_inet.c 283017 2015-05-16 22:38:16Z ngie $";
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 <net/if_var.h> /* for struct ifaddr */
50 #include <netinet/in_var.h>
51 #include <arpa/inet.h>
52 #include <netdb.h>
53
54 #include "ifconfig.h"
55
56 static struct in_aliasreq in_addreq;
57 static struct ifreq in_ridreq;
58
59 static void
in_status(int s __unused,const struct ifaddrs * ifa)60 in_status(int s __unused, const struct ifaddrs *ifa)
61 {
62 struct sockaddr_in *sin, null_sin;
63
64 memset(&null_sin, 0, sizeof(null_sin));
65
66 sin = (struct sockaddr_in *)ifa->ifa_addr;
67 if (sin == NULL)
68 return;
69
70 printf("\tinet %s ", inet_ntoa(sin->sin_addr));
71
72 if (ifa->ifa_flags & IFF_POINTOPOINT) {
73 sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
74 if (sin == NULL)
75 sin = &null_sin;
76 printf("--> %s ", inet_ntoa(sin->sin_addr));
77 }
78
79 sin = (struct sockaddr_in *)ifa->ifa_netmask;
80 if (sin == NULL)
81 sin = &null_sin;
82 printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
83
84 if (ifa->ifa_flags & IFF_BROADCAST) {
85 sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
86 if (sin != NULL && sin->sin_addr.s_addr != 0)
87 printf("broadcast %s", inet_ntoa(sin->sin_addr));
88 }
89 putchar('\n');
90 }
91
92 #define SIN(x) ((struct sockaddr_in *) &(x))
93 static struct sockaddr_in *sintab[] = {
94 SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
95 SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
96 };
97
98 static void
in_getaddr(const char * s,int which)99 in_getaddr(const char *s, int which)
100 {
101 struct sockaddr_in *sin = sintab[which];
102 struct hostent *hp;
103 struct netent *np;
104
105 sin->sin_len = sizeof(*sin);
106 sin->sin_family = AF_INET;
107
108 if (which == ADDR) {
109 char *p = NULL;
110
111 if((p = strrchr(s, '/')) != NULL) {
112 const char *errstr;
113 /* address is `name/masklen' */
114 int masklen;
115 struct sockaddr_in *min = sintab[MASK];
116 *p = '\0';
117 if (!isdigit(*(p + 1)))
118 errstr = "invalid";
119 else
120 masklen = (int)strtonum(p + 1, 0, 32, &errstr);
121 if (errstr != NULL) {
122 *p = '/';
123 errx(1, "%s: bad value (width %s)", s, errstr);
124 }
125 min->sin_family = AF_INET;
126 min->sin_len = sizeof(*min);
127 min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
128 0xffffffff);
129 }
130 }
131
132 if (inet_aton(s, &sin->sin_addr))
133 return;
134 if ((hp = gethostbyname(s)) != 0)
135 bcopy(hp->h_addr, (char *)&sin->sin_addr,
136 MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
137 else if ((np = getnetbyname(s)) != 0)
138 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
139 else
140 errx(1, "%s: bad value", s);
141 }
142
143 static void
in_status_tunnel(int s)144 in_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 (sa->sa_family != AF_INET)
157 return;
158 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
159 src[0] = '\0';
160
161 if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
162 return;
163 if (sa->sa_family != AF_INET)
164 return;
165 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
166 dst[0] = '\0';
167
168 printf("\ttunnel inet %s --> %s\n", src, dst);
169 }
170
171 static void
in_set_tunnel(int s,struct addrinfo * srcres,struct addrinfo * dstres)172 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
173 {
174 struct in_aliasreq addreq;
175
176 memset(&addreq, 0, sizeof(addreq));
177 strncpy(addreq.ifra_name, name, IFNAMSIZ);
178 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
179 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
180
181 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
182 warn("SIOCSIFPHYADDR");
183 }
184
185 static struct afswtch af_inet = {
186 .af_name = "inet",
187 .af_af = AF_INET,
188 .af_status = in_status,
189 .af_getaddr = in_getaddr,
190 .af_status_tunnel = in_status_tunnel,
191 .af_settunnel = in_set_tunnel,
192 .af_difaddr = SIOCDIFADDR,
193 .af_aifaddr = SIOCAIFADDR,
194 .af_ridreq = &in_ridreq,
195 .af_addreq = &in_addreq,
196 };
197
198 static __constructor void
inet_ctor(void)199 inet_ctor(void)
200 {
201
202 #ifndef RESCUE
203 if (!feature_present("inet"))
204 return;
205 #endif
206 af_register(&af_inet);
207 }
208