ifconfig.tproj/af_inet.c

   1 /*
   2  * Copyright (c) 2009-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*
  30  * Copyright (c) 1983, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #ifndef lint
  59 static const char rcsid[] =
  60   "$FreeBSD: src/sbin/ifconfig/af_inet.c,v 1.3.6.1 2008/11/25 02:59:29 kensmith Exp $";
  61 #endif /* not lint */
  62
  63 #include <sys/types.h>
  64 #include <sys/ioctl.h>
  65 #include <sys/socket.h>
  66 #include <net/if.h>
  67
  68 #include <err.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73 #include <ifaddrs.h>
  74
  75 #include <netinet/in.h>
  76 #include <net/if_var.h>         /* for struct ifaddr */
  77 #include <netinet/in_var.h>
  78 #include <arpa/inet.h>
  79 #include <netdb.h>
  80
  81 #include "ifconfig.h"
  82
  83 static struct ifaliasreq in_addreq;
  84 static struct ifreq in_ridreq;
  85
  86 static void
  87 in_status(int s __unused, const struct ifaddrs *ifa)
  88 {
  89         struct sockaddr_in *sin, null_sin;
  90
  91         memset(&null_sin, 0, sizeof(null_sin));
  92
  93         sin = (struct sockaddr_in *)ifa->ifa_addr;
  94         if (sin == NULL)
  95                 return;
  96
  97         printf("\tinet %s ", inet_ntoa(sin->sin_addr));
  98
  99         if (ifa->ifa_flags & IFF_POINTOPOINT) {
 100                 sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
 101                 if (sin == NULL)
 102                         sin = &null_sin;
 103                 printf("--> %s ", inet_ntoa(sin->sin_addr));
 104         }
 105
 106         sin = (struct sockaddr_in *)ifa->ifa_netmask;
 107         if (sin == NULL)
 108                 sin = &null_sin;
 109         printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
 110
 111         if (ifa->ifa_flags & IFF_BROADCAST) {
 112                 sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
 113                 if (sin != NULL && sin->sin_addr.s_addr != 0)
 114                         printf("broadcast %s", inet_ntoa(sin->sin_addr));
 115         }
 116         putchar('\n');
 117 }
 118
 119 #define SIN(x) ((struct sockaddr_in *) &(x))
 120 static struct sockaddr_in *sintab[] = {
 121         SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
 122         SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
 123 };
 124
 125 static void
 126 in_getaddr(const char *s, int which)
 127 {
 128 #ifndef MIN
 129 #define MIN(a,b)        ((a)<(b)?(a):(b))
 130 #endif /* MIN */
 131         struct sockaddr_in *sin = sintab[which];
 132         struct hostent *hp;
 133         struct netent *np;
 134
 135         sin->sin_len = sizeof(*sin);
 136         if (which != MASK)
 137                 sin->sin_family = AF_INET;
 138
 139         if (which == ADDR) {
 140                 char *p = NULL;
 141
 142                 if((p = strrchr(s, '/')) != NULL) {
 143                         /* address is `name/masklen' */
 144                         int masklen;
 145                         int ret;
 146                         struct sockaddr_in *min = sintab[MASK];
 147                         *p = '\0';
 148                         ret = sscanf(p+1, "%u", &masklen);
 149                         if(ret != 1 || (masklen < 0 || masklen > 32)) {
 150                                 *p = '/';
 151                                 errx(1, "%s: bad value", s);
 152                         }
 153                         min->sin_len = sizeof(*min);
 154                         min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
 155                                               0xffffffff);
 156                 }
 157         }
 158
 159         if (inet_aton(s, &sin->sin_addr))
 160                 return;
 161         if ((hp = gethostbyname(s)) != 0)
 162                 bcopy(hp->h_addr, (char *)&sin->sin_addr,
 163                     MIN(hp->h_length, sizeof(sin->sin_addr)));
 164         else if ((np = getnetbyname(s)) != 0)
 165                 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
 166         else
 167                 errx(1, "%s: bad value", s);
 168 #undef MIN
 169 }
 170
 171 static void
 172 in_status_tunnel(int s)
 173 {
 174         char src[NI_MAXHOST];
 175         char dst[NI_MAXHOST];
 176         struct ifreq ifr;
 177         const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
 178
 179         memset(&ifr, 0, sizeof(ifr));
 180         strncpy(ifr.ifr_name, name, IFNAMSIZ);
 181
 182         if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
 183                 return;
 184         if (sa->sa_family != AF_INET)
 185                 return;
 186         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
 187                 src[0] = '\0';
 188
 189         if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
 190                 return;
 191         if (sa->sa_family != AF_INET)
 192                 return;
 193         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
 194                 dst[0] = '\0';
 195
 196         printf("\ttunnel inet %s --> %s\n", src, dst);
 197 }
 198
 199 static void
 200 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 201 {
 202         struct ifaliasreq addreq;
 203
 204         memset(&addreq, 0, sizeof(addreq));
 205         strncpy(addreq.ifra_name, name, IFNAMSIZ);
 206         memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 207         memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
 208
 209         if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
 210                 warn("SIOCSIFPHYADDR");
 211 }
 212
 213 static void
 214 in_set_router(int s, int enable)
 215 {
 216         struct ifreq ifr;
 217
 218         bzero(&ifr, sizeof (ifr));
 219         strncpy(ifr.ifr_name, name, IFNAMSIZ);
 220         ifr.ifr_intval = enable;
 221
 222         if (ioctl(s, SIOCSETROUTERMODE, &ifr) < 0)
 223                 warn("SIOCSETROUTERMODE");
 224 }
 225
 226 static struct afswtch af_inet = {
 227         .af_name        = "inet",
 228         .af_af          = AF_INET,
 229         .af_status      = in_status,
 230         .af_getaddr     = in_getaddr,
 231         .af_status_tunnel = in_status_tunnel,
 232         .af_settunnel   = in_set_tunnel,
 233         .af_setrouter   = in_set_router,
 234         .af_difaddr     = SIOCDIFADDR,
 235         .af_aifaddr     = SIOCAIFADDR,
 236         .af_ridreq      = &in_ridreq,
 237         .af_addreq      = &in_addreq,
 238 };
 239
 240 static __constructor void
 241 inet_ctor(void)
 242 {
 243         af_register(&af_inet);
 244 }