ifconfig.tproj/af_inet.c

   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: src/sbin/ifconfig/af_inet.c,v 1.3.6.1 2008/11/25 02:59:29 kensmith Exp $";
  33 #endif /* not lint */
  34
  35 #include <sys/types.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/socket.h>
  38 #include <net/if.h>
  39
  40 #include <err.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <ifaddrs.h>
  46
  47 #include <netinet/in.h>
  48 #include <net/if_var.h>         /* for struct ifaddr */
  49 #include <netinet/in_var.h>
  50 #include <arpa/inet.h>
  51 #include <netdb.h>
  52
  53 #include "ifconfig.h"
  54
  55 static struct ifaliasreq in_addreq;
  56 static struct ifreq in_ridreq;
  57
  58 static void
  59 in_status(int s __unused, const struct ifaddrs *ifa)
  60 {
  61         struct sockaddr_in *sin, null_sin;
  62
  63         memset(&null_sin, 0, sizeof(null_sin));
  64
  65         sin = (struct sockaddr_in *)ifa->ifa_addr;
  66         if (sin == NULL)
  67                 return;
  68
  69         printf("\tinet %s ", inet_ntoa(sin->sin_addr));
  70
  71         if (ifa->ifa_flags & IFF_POINTOPOINT) {
  72                 sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
  73                 if (sin == NULL)
  74                         sin = &null_sin;
  75                 printf("--> %s ", inet_ntoa(sin->sin_addr));
  76         }
  77
  78         sin = (struct sockaddr_in *)ifa->ifa_netmask;
  79         if (sin == NULL)
  80                 sin = &null_sin;
  81         printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
  82
  83         if (ifa->ifa_flags & IFF_BROADCAST) {
  84                 sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
  85                 if (sin != NULL && sin->sin_addr.s_addr != 0)
  86                         printf("broadcast %s", inet_ntoa(sin->sin_addr));
  87         }
  88         putchar('\n');
  89 }
  90
  91 #define SIN(x) ((struct sockaddr_in *) &(x))
  92 static struct sockaddr_in *sintab[] = {
  93         SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
  94         SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
  95 };
  96
  97 static void
  98 in_getaddr(const char *s, int which)
  99 {
 100 #ifndef MIN
 101 #define MIN(a,b)        ((a)<(b)?(a):(b))
 102 #endif /* MIN */
 103         struct sockaddr_in *sin = sintab[which];
 104         struct hostent *hp;
 105         struct netent *np;
 106
 107         sin->sin_len = sizeof(*sin);
 108         if (which != MASK)
 109                 sin->sin_family = AF_INET;
 110
 111         if (which == ADDR) {
 112                 char *p = NULL;
 113
 114                 if((p = strrchr(s, '/')) != NULL) {
 115                         /* address is `name/masklen' */
 116                         int masklen;
 117                         int ret;
 118                         struct sockaddr_in *min = sintab[MASK];
 119                         *p = '\0';
 120                         ret = sscanf(p+1, "%u", &masklen);
 121                         if(ret != 1 || (masklen < 0 || masklen > 32)) {
 122                                 *p = '/';
 123                                 errx(1, "%s: bad value", s);
 124                         }
 125                         min->sin_len = sizeof(*min);
 126                         min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
 127                                               0xffffffff);
 128                 }
 129         }
 130
 131         if (inet_aton(s, &sin->sin_addr))
 132                 return;
 133         if ((hp = gethostbyname(s)) != 0)
 134                 bcopy(hp->h_addr, (char *)&sin->sin_addr,
 135                     MIN(hp->h_length, sizeof(sin->sin_addr)));
 136         else if ((np = getnetbyname(s)) != 0)
 137                 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
 138         else
 139                 errx(1, "%s: bad value", s);
 140 #undef MIN
 141 }
 142
 143 static void
 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
 172 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 173 {
 174         struct ifaliasreq 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
 199 inet_ctor(void)
 200 {
 201         af_register(&af_inet);
 202 }