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/route.h>          /* for RTX_IFA */
  37
  38 #include <err.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include <netinet/in.h>
  45 #include <net/if_var.h>         /* for struct ifaddr */
  46 #include <netinet/in_var.h>
  47 #include <arpa/inet.h>
  48 #include <netdb.h>
  49
  50 #include "ifconfig.h"
  51
  52 static struct ifaliasreq in_addreq;
  53 static struct ifreq in_ridreq;
  54
  55 static void
  56 in_status(int s __unused, const struct rt_addrinfo * info)
  57 {
  58         struct sockaddr_in *sin, null_sin;
  59
  60         memset(&null_sin, 0, sizeof(null_sin));
  61
  62         sin = (struct sockaddr_in *)info->rti_info[RTAX_IFA];
  63         if (sin == NULL)
  64                 return;
  65
  66         printf("\tinet %s ", inet_ntoa(sin->sin_addr));
  67
  68         if (flags & IFF_POINTOPOINT) {
  69                 /* note RTAX_BRD overlap with IFF_BROADCAST */
  70                 sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
  71                 if (!sin)
  72                         sin = &null_sin;
  73                 printf("--> %s ", inet_ntoa(sin->sin_addr));
  74         }
  75
  76         sin = (struct sockaddr_in *)info->rti_info[RTAX_NETMASK];
  77         if (!sin)
  78                 sin = &null_sin;
  79         printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr));
  80
  81         if (flags & IFF_BROADCAST) {
  82                 /* note RTAX_BRD overlap with IFF_POINTOPOINT */
  83                 sin = (struct sockaddr_in *)info->rti_info[RTAX_BRD];
  84                 if (sin && sin->sin_addr.s_addr != 0)
  85                         printf("broadcast %s", inet_ntoa(sin->sin_addr));
  86         }
  87         putchar('\n');
  88 }
  89
  90 #define SIN(x) ((struct sockaddr_in *) &(x))
  91 static struct sockaddr_in *sintab[] = {
  92         SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
  93         SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
  94 };
  95
  96 static void
  97 in_getaddr(const char *s, int which)
  98 {
  99         struct sockaddr_in *sin = sintab[which];
 100         struct hostent *hp;
 101         struct netent *np;
 102
 103         sin->sin_len = sizeof(*sin);
 104         if (which != MASK)
 105                 sin->sin_family = AF_INET;
 106
 107         if (which == ADDR) {
 108                 char *p = NULL;
 109
 110                 if((p = strrchr(s, '/')) != NULL) {
 111                         /* address is `name/masklen' */
 112                         int masklen;
 113                         int ret;
 114                         struct sockaddr_in *min = sintab[MASK];
 115                         *p = '\0';
 116                         ret = sscanf(p+1, "%u", &masklen);
 117                         if(ret != 1 || (masklen < 0 || masklen > 32)) {
 118                                 *p = '/';
 119                                 errx(1, "%s: bad value", s);
 120                         }
 121                         min->sin_len = sizeof(*min);
 122                         min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) &
 123                                               0xffffffff);
 124                 }
 125         }
 126
 127         if (inet_aton(s, &sin->sin_addr))
 128                 return;
 129         if ((hp = gethostbyname(s)) != NULL)
 130                 bcopy(hp->h_addr, (char *)&sin->sin_addr,
 131                     MIN(hp->h_length, sizeof(sin->sin_addr)));
 132         else if ((np = getnetbyname(s)) != NULL)
 133                 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
 134         else
 135                 errx(1, "%s: bad value", s);
 136 }
 137
 138 static void
 139 in_status_tunnel(int s)
 140 {
 141         char src[NI_MAXHOST];
 142         char dst[NI_MAXHOST];
 143         struct ifreq ifr;
 144         const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;
 145
 146         memset(&ifr, 0, sizeof(ifr));
 147         strncpy(ifr.ifr_name, name, IFNAMSIZ);
 148
 149         if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0)
 150                 return;
 151         if (sa->sa_family != AF_INET)
 152                 return;
 153         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0)
 154                 src[0] = '\0';
 155
 156         if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0)
 157                 return;
 158         if (sa->sa_family != AF_INET)
 159                 return;
 160         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0)
 161                 dst[0] = '\0';
 162
 163         printf("\ttunnel inet %s --> %s\n", src, dst);
 164 }
 165
 166 static void
 167 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 168 {
 169         struct ifaliasreq addreq;
 170
 171         memset(&addreq, 0, sizeof(addreq));
 172         strncpy(addreq.ifra_name, name, IFNAMSIZ);
 173         memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 174         memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
 175
 176         if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
 177                 warn("SIOCSIFPHYADDR");
 178 }
 179
 180 static struct afswtch af_inet = {
 181         .af_name        = "inet",
 182         .af_af          = AF_INET,
 183         .af_status      = in_status,
 184         .af_getaddr     = in_getaddr,
 185         .af_status_tunnel = in_status_tunnel,
 186         .af_settunnel   = in_set_tunnel,
 187         .af_difaddr     = SIOCDIFADDR,
 188         .af_aifaddr     = SIOCAIFADDR,
 189         .af_ridreq      = &in_ridreq,
 190         .af_addreq      = &in_addreq,
 191 };
 192
 193 static __constructor(101) void
 194 inet_ctor(void)
 195 {
 196         af_register(&af_inet);
 197 }