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  * 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  * $FreeBSD: src/sbin/ifconfig/af_inet.c,v 1.2 2005/06/16 19:37:09 ume Exp $
  30  * $DragonFly: src/sbin/ifconfig/af_inet.c,v 1.2 2006/06/24 07:51:37 sephe Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/ioctl.h>
  35 #include <sys/socket.h>
  36 #include <net/if.h>
  37 #include <net/route.h>          /* for RTX_IFA */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include <netinet/in.h>
  46 #include <net/if_var.h>         /* for struct ifaddr */
  47 #include <netinet/in_var.h>
  48 #include <arpa/inet.h>
  49 #include <netdb.h>
  50
  51 #include "ifconfig.h"
  52
  53 static struct ifaliasreq in_addreq;
  54 static struct ifreq in_ridreq;
  55
  56 static void
  57 in_status(int s __unused, const struct rt_addrinfo * info)
  58 {
  59         struct sockaddr_in *sin, null_sin;
  60
  61         memset(&null_sin, 0, sizeof(null_sin));
  62
  63         sin = (struct sockaddr_in *)info->rti_info[RTAX_IFA];
  64         if (sin == NULL)
  65                 return;
  66
  67         printf("\tinet %s ", inet_ntoa(sin->sin_addr));
  68
  69         if (flags & IFF_POINTOPOINT) {
  70                 /* note RTAX_BRD overlap with IFF_BROADCAST */
  71                 sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
  72                 if (!sin)
  73                         sin = &null_sin;
  74                 printf("--> %s ", inet_ntoa(sin->sin_addr));
  75         }
  76
  77         sin = (struct sockaddr_in *)info->rti_info[RTAX_NETMASK];
  78         if (!sin)
  79                 sin = &null_sin;
  80         printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
  81
  82         if (flags & IFF_BROADCAST) {
  83                 /* note RTAX_BRD overlap with IFF_POINTOPOINT */
  84                 sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
  85                 if (sin && 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         struct sockaddr_in *sin = sintab[which];
 101         struct hostent *hp;
 102         struct netent *np;
 103
 104         sin->sin_len = sizeof(*sin);
 105         if (which != MASK)
 106                 sin->sin_family = AF_INET;
 107
 108         if (which == ADDR) {
 109                 char *p = NULL;
 110
 111                 if((p = strrchr(s, '/')) != NULL) {
 112                         /* address is `name/masklen' */
 113                         int masklen;
 114                         int ret;
 115                         struct sockaddr_in *min = sintab[MASK];
 116                         *p = '\0';
 117                         ret = sscanf(p+1, "%u", &masklen);
 118                         if(ret != 1 || (masklen < 0 || masklen > 32)) {
 119                                 *p = '/';
 120                                 errx(1, "%s: bad value", s);
 121                         }
 122                         min->sin_len = sizeof(*min);
 123                         min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
 124                                               0xffffffff);
 125                 }
 126         }
 127
 128         if (inet_aton(s, &sin->sin_addr))
 129                 return;
 130         if ((hp = gethostbyname(s)) != 0)
 131                 bcopy(hp->h_addr, (char *)&sin->sin_addr,
 132                     MIN(hp->h_length, sizeof(sin->sin_addr)));
 133         else if ((np = getnetbyname(s)) != 0)
 134                 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
 135         else
 136                 errx(1, "%s: bad value", s);
 137 }
 138
 139 static void
 140 in_status_tunnel(int s)
 141 {
 142         char src[NI_MAXHOST];
 143         char dst[NI_MAXHOST];
 144         struct ifreq ifr;
 145         const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
 146
 147         memset(&ifr, 0, sizeof(ifr));
 148         strncpy(ifr.ifr_name, name, IFNAMSIZ);
 149
 150         if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
 151                 return;
 152         if (sa->sa_family != AF_INET)
 153                 return;
 154         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
 155                 src[0] = '\0';
 156
 157         if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
 158                 return;
 159         if (sa->sa_family != AF_INET)
 160                 return;
 161         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
 162                 dst[0] = '\0';
 163
 164         printf("\ttunnel inet %s --> %s\n", src, dst);
 165 }
 166
 167 static void
 168 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 169 {
 170         struct ifaliasreq addreq;
 171
 172         memset(&addreq, 0, sizeof(addreq));
 173         strncpy(addreq.ifra_name, name, IFNAMSIZ);
 174         memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 175         memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
 176
 177         if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
 178                 warn("SIOCSIFPHYADDR");
 179 }
 180
 181 static struct afswtch af_inet = {
 182         .af_name        = "inet",
 183         .af_af          = AF_INET,
 184         .af_status      = in_status,
 185         .af_getaddr     = in_getaddr,
 186         .af_status_tunnel = in_status_tunnel,
 187         .af_settunnel   = in_set_tunnel,
 188         .af_difaddr     = SIOCDIFADDR,
 189         .af_aifaddr     = SIOCAIFADDR,
 190         .af_ridreq      = &in_ridreq,
 191         .af_addreq      = &in_addreq,
 192 };
 193
 194 static __constructor void
 195 inet_ctor(void)
 196 {
 197         af_register(&af_inet);
 198 }