ifconfig.tproj/af_inet.c

   1 /*
   2  * Copyright (c) 2009-2011, 2020 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 #include <sys/types.h>
  59 #include <sys/ioctl.h>
  60 #include <sys/socket.h>
  61 #include <net/if.h>
  62
  63 #include <err.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68 #include <ifaddrs.h>
  69
  70 #include <netinet/in.h>
  71 #include <net/if_var.h>         /* for struct ifaddr */
  72 #include <netinet/in_var.h>
  73 #include <arpa/inet.h>
  74 #include <netdb.h>
  75
  76 #include "ifconfig.h"
  77
  78 static struct ifaliasreq in_addreq;
  79 static struct ifreq in_ridreq;
  80
  81 static void
  82 in_status(int s __unused, const struct ifaddrs *ifa)
  83 {
  84         struct sockaddr_in *sin, null_sin;
  85
  86         memset(&null_sin, 0, sizeof(null_sin));
  87
  88         sin = (struct sockaddr_in *)ifa->ifa_addr;
  89         if (sin == NULL)
  90                 return;
  91
  92         printf("\tinet %s ", inet_ntoa(sin->sin_addr));
  93
  94         if (ifa->ifa_flags & IFF_POINTOPOINT) {
  95                 sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
  96                 if (sin == NULL)
  97                         sin = &null_sin;
  98                 printf("--> %s ", inet_ntoa(sin->sin_addr));
  99         }
 100
 101         sin = (struct sockaddr_in *)ifa->ifa_netmask;
 102         if (sin == NULL)
 103                 sin = &null_sin;
 104         printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
 105
 106         if (ifa->ifa_flags & IFF_BROADCAST) {
 107                 sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
 108                 if (sin != NULL && sin->sin_addr.s_addr != 0)
 109                         printf("broadcast %s", inet_ntoa(sin->sin_addr));
 110         }
 111         putchar('\n');
 112 }
 113
 114 #define SIN(x) ((struct sockaddr_in *) &(x))
 115 static struct sockaddr_in *sintab[] = {
 116         SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
 117         SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
 118 };
 119
 120 static void
 121 in_getaddr(const char *s, int which)
 122 {
 123 #ifndef MIN
 124 #define MIN(a,b)        ((a)<(b)?(a):(b))
 125 #endif /* MIN */
 126         struct sockaddr_in *sin = sintab[which];
 127         struct hostent *hp;
 128         struct netent *np;
 129
 130         sin->sin_len = sizeof(*sin);
 131         if (which != MASK)
 132                 sin->sin_family = AF_INET;
 133
 134         if (which == ADDR) {
 135                 char *p = NULL;
 136
 137                 if((p = strrchr(s, '/')) != NULL) {
 138                         /* address is `name/masklen' */
 139                         int masklen;
 140                         int ret;
 141                         struct sockaddr_in *min = sintab[MASK];
 142                         *p = '\0';
 143                         ret = sscanf(p+1, "%u", &masklen);
 144                         if(ret != 1 || (masklen < 0 || masklen > 32)) {
 145                                 *p = '/';
 146                                 errx(1, "%s: bad value", s);
 147                         }
 148                         min->sin_len = sizeof(*min);
 149                         min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
 150                                               0xffffffff);
 151                 }
 152         }
 153
 154         if (inet_aton(s, &sin->sin_addr))
 155                 return;
 156         if ((hp = gethostbyname(s)) != 0)
 157                 bcopy(hp->h_addr, (char *)&sin->sin_addr,
 158                     MIN(hp->h_length, sizeof(sin->sin_addr)));
 159         else if ((np = getnetbyname(s)) != 0)
 160                 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
 161         else
 162                 errx(1, "%s: bad value", s);
 163 #undef MIN
 164 }
 165
 166 static void
 167 in_status_tunnel(int s)
 168 {
 169         char src[NI_MAXHOST];
 170         char dst[NI_MAXHOST];
 171         struct ifreq ifr;
 172         const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
 173
 174         memset(&ifr, 0, sizeof(ifr));
 175         strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 176
 177         if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
 178                 return;
 179         if (sa->sa_family != AF_INET)
 180                 return;
 181         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
 182                 src[0] = '\0';
 183
 184         if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
 185                 return;
 186         if (sa->sa_family != AF_INET)
 187                 return;
 188         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
 189                 dst[0] = '\0';
 190
 191         printf("\ttunnel inet %s --> %s\n", src, dst);
 192 }
 193
 194 static void
 195 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 196 {
 197         struct ifaliasreq addreq;
 198
 199         memset(&addreq, 0, sizeof(addreq));
 200         strlcpy(addreq.ifra_name, name, sizeof(addreq.ifra_name));
 201         memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 202         memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
 203
 204         if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
 205                 warn("SIOCSIFPHYADDR");
 206 }
 207
 208 static void
 209 in_set_router(int s, int enable)
 210 {
 211         struct ifreq ifr;
 212
 213         bzero(&ifr, sizeof (ifr));
 214         strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 215         ifr.ifr_intval = enable;
 216
 217         if (ioctl(s, SIOCSETROUTERMODE, &ifr) < 0)
 218                 warn("SIOCSETROUTERMODE");
 219 }
 220
 221 static int
 222 routermode_from_string(char * str, int *mode_p)
 223 {
 224         int     success = 1;
 225
 226         if (strcasecmp(str, "enabled") == 0) {
 227                 *mode_p = 1;
 228         } else if (strcasecmp(str, "disabled") == 0) {
 229                 *mode_p = 0;
 230         } else {
 231                 success = 0;
 232         }
 233         return (success);
 234 }
 235
 236 static const char *
 237 routermode_string(int mode)
 238 {
 239         const char *    str;
 240
 241         switch (mode) {
 242         case 0:
 243                 str = "disabled";
 244                 break;
 245         case 1:
 246                 str = "enabled";
 247                 break;
 248         default:
 249                 str = "<unknown>";
 250                 break;
 251         }
 252         return str;
 253 }
 254
 255 static int
 256 in_routermode(int s, int argc, char *const*argv)
 257 {
 258         struct ifreq    ifr;
 259         int             ret;
 260
 261         bzero(&ifr, sizeof (ifr));
 262         strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 263         if (argc == 0) {
 264                 ret = 0;
 265 #ifndef SIOCGETROUTERMODE
 266 #define SIOCGETROUTERMODE _IOWR('i', 209, struct ifreq)   /* get IPv4 router mode state */
 267 #endif /* SIOCGETROUTERMODE */
 268                 if (ioctl(s, SIOCGETROUTERMODE, &ifr) < 0) {
 269                         if (argv != NULL) {
 270                                 warn("SIOCGETROUTERMODE");
 271                         }
 272                 } else {
 273                         /* argv is NULL if we're called from status() */
 274                         printf("%s%s\n",
 275                                (argv == NULL) ? "\troutermode4: " : "",
 276                                routermode_string(ifr.ifr_intval));
 277                 }
 278                 ret = 0;
 279         } else {
 280                 int mode;
 281
 282                 if (routermode_from_string(argv[0], &mode) == 0) {
 283                         errx(EXIT_FAILURE,
 284                              "mode '%s' invalid, must be one of "
 285                              "disabled or enabled",
 286                              argv[0]);
 287                 }
 288                 ifr.ifr_intval = mode;
 289                 if (ioctl(s, SIOCSETROUTERMODE, &ifr) < 0) {
 290                         warn("SIOCSETROUTERMODE");
 291                 }
 292                 ret = 1;
 293         }
 294         return ret;
 295 }
 296
 297 static struct afswtch af_inet = {
 298         .af_name        = "inet",
 299         .af_af          = AF_INET,
 300         .af_status      = in_status,
 301         .af_getaddr     = in_getaddr,
 302         .af_status_tunnel = in_status_tunnel,
 303         .af_settunnel   = in_set_tunnel,
 304         .af_setrouter   = in_set_router,
 305         .af_routermode  = in_routermode,
 306         .af_difaddr     = SIOCDIFADDR,
 307         .af_aifaddr     = SIOCAIFADDR,
 308         .af_ridreq      = &in_ridreq,
 309         .af_addreq      = &in_addreq,
 310 };
 311
 312 static __constructor void
 313 inet_ctor(void)
 314 {
 315         af_register(&af_inet);
 316 }