sbin/ifconfig/af_inet.c

   1 /*      $NetBSD: af_inet.c,v 1.13 2009/08/07 19:35:55 dyoung Exp $      */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __RCSID("$NetBSD: af_inet.c,v 1.13 2009/08/07 19:35:55 dyoung Exp $");
  35 #endif /* not lint */
  36
  37 #include <sys/param.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/socket.h>
  40
  41 #include <net/if.h>
  42 #include <netinet/in.h>
  43 #include <netinet/in_var.h>
  44
  45 #include <arpa/inet.h>
  46
  47 #include <assert.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <ifaddrs.h>
  51 #include <netdb.h>
  52 #include <string.h>
  53 #include <stdlib.h>
  54 #include <stdio.h>
  55 #include <util.h>
  56
  57 #include "env.h"
  58 #include "extern.h"
  59 #include "af_inetany.h"
  60
  61 static void in_constructor(void) __attribute__((constructor));
  62 static void in_status(prop_dictionary_t, prop_dictionary_t, bool);
  63 static void in_commit_address(prop_dictionary_t, prop_dictionary_t);
  64 static void in_alias(const char *, prop_dictionary_t, prop_dictionary_t,
  65     struct in_aliasreq *);
  66
  67 static struct afswtch af = {
  68         .af_name = "inet", .af_af = AF_INET, .af_status = in_status,
  69         .af_addr_commit = in_commit_address
  70 };
  71
  72 static void
  73 in_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
  74     struct in_aliasreq *creq)
  75 {
  76         struct ifreq ifr;
  77         bool alias;
  78         int s;
  79         unsigned short flags;
  80         struct in_aliasreq in_addreq;
  81         const struct sockaddr_in * const asin = &in_addreq.ifra_addr;
  82         const struct sockaddr_in * const dsin = &in_addreq.ifra_dstaddr;
  83         const struct sockaddr_in * const bsin = &in_addreq.ifra_broadaddr;
  84         char hbuf[NI_MAXHOST];
  85         const int niflag = Nflag ? 0 : NI_NUMERICHOST;
  86
  87         if (lflag)
  88                 return;
  89
  90         alias = true;
  91
  92         /* Get the non-alias address for this interface. */
  93         if ((s = getsock(AF_INET)) == -1) {
  94                 if (errno == EAFNOSUPPORT)
  95                         return;
  96                 err(EXIT_FAILURE, "socket");
  97         }
  98         memset(&ifr, 0, sizeof(ifr));
  99         estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 100         if (ioctl(s, SIOCGIFADDR, &ifr) == -1) {
 101                 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
 102                         return;
 103                 warn("SIOCGIFADDR");
 104         }
 105         /* If creq and ifr are the same address, this is not an alias. */
 106         if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0)
 107                 alias = false;
 108         in_addreq = *creq;
 109         if (ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) {
 110                 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
 111                         return;
 112                 } else
 113                         warn("SIOCGIFALIAS");
 114         }
 115
 116         if (getnameinfo((const struct sockaddr *)asin, asin->sin_len,
 117                         hbuf, sizeof(hbuf), NULL, 0, niflag))
 118                 strlcpy(hbuf, "", sizeof(hbuf));        /* some message? */
 119         printf("\tinet %s%s", alias ? "alias " : "", hbuf);
 120
 121         if (getifflags(env, oenv, &flags) == -1)
 122                 err(EXIT_FAILURE, "%s: getifflags", __func__);
 123
 124         if (flags & IFF_POINTOPOINT) {
 125                 if (getnameinfo((const struct sockaddr *)dsin, dsin->sin_len,
 126                                 hbuf, sizeof(hbuf), NULL, 0, niflag))
 127                         strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
 128                 printf(" -> %s", hbuf);
 129         }
 130
 131         printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr));
 132
 133         if (flags & IFF_BROADCAST) {
 134                 if (getnameinfo((const struct sockaddr *)bsin, bsin->sin_len,
 135                                 hbuf, sizeof(hbuf), NULL, 0, niflag))
 136                         strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
 137                 printf(" broadcast %s", hbuf);
 138         }
 139 }
 140
 141 static void
 142 in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
 143 {
 144         struct ifaddrs *ifap, *ifa;
 145         struct in_aliasreq ifra;
 146         bool printprefs = false;
 147         const char *ifname;
 148
 149         if ((ifname = getifname(env)) == NULL)
 150                 err(EXIT_FAILURE, "%s: getifname", __func__);
 151
 152         if (getifaddrs(&ifap) != 0)
 153                 err(EXIT_FAILURE, "getifaddrs");
 154
 155         printprefs = ifa_any_preferences(ifname, ifap, AF_INET);
 156
 157         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
 158                 if (strcmp(ifname, ifa->ifa_name) != 0)
 159                         continue;
 160                 if (ifa->ifa_addr->sa_family != AF_INET)
 161                         continue;
 162                 if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len)
 163                         continue;
 164
 165                 memset(&ifra, 0, sizeof(ifra));
 166                 estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name));
 167                 memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
 168                 in_alias(ifa->ifa_name, env, oenv, &ifra);
 169                 if (printprefs)
 170                         ifa_print_preference(ifa->ifa_name, ifa->ifa_addr);
 171                 printf("\n");
 172         }
 173         freeifaddrs(ifap);
 174 }
 175
 176 static void
 177 in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
 178 {
 179         struct ifreq in_ifr;
 180         struct in_aliasreq in_ifra;
 181         struct afparam inparam = {
 182                   .req = BUFPARAM(in_ifra)
 183                 , .dgreq = BUFPARAM(in_ifr)
 184                 , .name = {
 185                           {.buf = in_ifr.ifr_name,
 186                            .buflen = sizeof(in_ifr.ifr_name)}
 187                         , {.buf = in_ifra.ifra_name,
 188                            .buflen = sizeof(in_ifra.ifra_name)}
 189                   }
 190                 , .dgaddr = BUFPARAM(in_ifr.ifr_addr)
 191                 , .addr = BUFPARAM(in_ifra.ifra_addr)
 192                 , .dst = BUFPARAM(in_ifra.ifra_dstaddr)
 193                 , .brd = BUFPARAM(in_ifra.ifra_broadaddr)
 194                 , .mask = BUFPARAM(in_ifra.ifra_mask)
 195                 , .aifaddr = IFADDR_PARAM(SIOCAIFADDR)
 196                 , .difaddr = IFADDR_PARAM(SIOCDIFADDR)
 197                 , .gifaddr = IFADDR_PARAM(SIOCGIFADDR)
 198                 , .defmask = {.buf = NULL, .buflen = 0}
 199         };
 200         memset(&in_ifr, 0, sizeof(in_ifr));
 201         memset(&in_ifra, 0, sizeof(in_ifra));
 202         commit_address(env, oenv, &inparam);
 203 }
 204
 205 static void
 206 in_constructor(void)
 207 {
 208         register_family(&af);
 209 }