sbin/ifconfig/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  * 3. 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  * $FreeBSD: src/sbin/ifconfig/af_inet.c,v 1.2 2005/06/16 19:37:09 ume Exp $
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/socket.h>
  35 #include <net/if.h>
  36 #include <net/if_var.h>         /* for struct ifaddr */
  37 #include <net/route.h>          /* for RTX_IFA */
  38 #include <netinet/in.h>
  39 #include <netinet/in_var.h>
  40 #include <arpa/inet.h>
  41 #include <netdb.h>
  42
  43 #include <err.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include "ifconfig.h"
  50
  51 static struct ifaliasreq in_addreq;
  52 static struct ifreq in_ridreq;
  53
  54 static void
  55 in_status(int s __unused, const struct rt_addrinfo * info)
  56 {
  57         struct sockaddr_in *sin, null_sin;
  58
  59         memset(&null_sin, 0, sizeof(null_sin));
  60
  61         sin = (struct sockaddr_in *)info->rti_info[RTAX_IFA];
  62         if (sin == NULL)
  63                 return;
  64
  65         printf("\tinet %s ", inet_ntoa(sin->sin_addr));
  66
  67         if (flags & IFF_POINTOPOINT) {
  68                 /* note RTAX_BRD overlap with IFF_BROADCAST */
  69                 sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
  70                 if (!sin)
  71                         sin = &null_sin;
  72                 printf("--> %s ", inet_ntoa(sin->sin_addr));
  73         }
  74
  75         sin = (struct sockaddr_in *)info->rti_info[RTAX_NETMASK];
  76         if (!sin)
  77                 sin = &null_sin;
  78         printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
  79
  80         if (flags & IFF_BROADCAST) {
  81                 /* note RTAX_BRD overlap with IFF_POINTOPOINT */
  82                 sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
  83                 if (sin && sin->sin_addr.s_addr != 0)
  84                         printf("broadcast %s", inet_ntoa(sin->sin_addr));
  85         }
  86         putchar('\n');
  87 }
  88
  89 #define SIN(x) ((struct sockaddr_in *) &(x))
  90 static struct sockaddr_in *sintab[] = {
  91         SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
  92         SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
  93 };
  94
  95 static void
  96 in_getaddr(const char *s, int which)
  97 {
  98         struct sockaddr_in *sin = sintab[which];
  99         struct hostent *hp;
 100         struct netent *np;
 101
 102         sin->sin_len = sizeof(*sin);
 103         if (which != MASK)
 104                 sin->sin_family = AF_INET;
 105
 106         if (which == ADDR) {
 107                 char *p = NULL;
 108
 109                 if((p = strrchr(s, '/')) != NULL) {
 110                         /* address is `name/masklen' */
 111                         int masklen;
 112                         int ret;
 113                         struct sockaddr_in *min = sintab[MASK];
 114                         *p = '\0';
 115                         ret = sscanf(p+1, "%u", &masklen);
 116                         if(ret != 1 || (masklen < 0 || masklen > 32)) {
 117                                 *p = '/';
 118                                 errx(1, "%s: bad value", s);
 119                         }
 120                         min->sin_len = sizeof(*min);
 121                         min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
 122                                                      0xffffffff);
 123                 }
 124         }
 125
 126         if (inet_aton(s, &sin->sin_addr))
 127                 return;
 128         if ((hp = gethostbyname(s)) != NULL)
 129                 bcopy(hp->h_addr, (char *)&sin->sin_addr,
 130                       MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
 131         else if ((np = getnetbyname(s)) != NULL)
 132                 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
 133         else
 134                 errx(1, "%s: bad value", s);
 135 }
 136
 137 static void
 138 in_status_tunnel(int s)
 139 {
 140         char src[NI_MAXHOST];
 141         char dst[NI_MAXHOST];
 142         struct ifreq ifr;
 143         const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
 144
 145         memset(&ifr, 0, sizeof(ifr));
 146         strlcpy(ifr.ifr_name, name, IFNAMSIZ);
 147
 148         if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
 149                 return;
 150         if (sa->sa_family != AF_INET)
 151                 return;
 152         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
 153                 src[0] = '\0';
 154
 155         if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
 156                 return;
 157         if (sa->sa_family != AF_INET)
 158                 return;
 159         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
 160                 dst[0] = '\0';
 161
 162         printf("\ttunnel inet %s --> %s\n", src, dst);
 163 }
 164
 165 static void
 166 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 167 {
 168         struct ifaliasreq addreq;
 169
 170         memset(&addreq, 0, sizeof(addreq));
 171         strlcpy(addreq.ifra_name, name, IFNAMSIZ);
 172         memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 173         memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
 174
 175         if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
 176                 warn("SIOCSIFPHYADDR");
 177 }
 178
 179 static struct afswtch af_inet = {
 180         .af_name        = "inet",
 181         .af_af          = AF_INET,
 182         .af_status      = in_status,
 183         .af_getaddr     = in_getaddr,
 184         .af_status_tunnel = in_status_tunnel,
 185         .af_settunnel   = in_set_tunnel,
 186         .af_difaddr     = SIOCDIFADDR,
 187         .af_aifaddr     = SIOCAIFADDR,
 188         .af_ridreq      = &in_ridreq,
 189         .af_addreq      = &in_addreq,
 190 };
 191
 192 static __constructor(101) void
 193 inet_ctor(void)
 194 {
 195         af_register(&af_inet);
 196 }