sbin/ifconfig/af_inet.c

   1 /*      $NetBSD: af_inet.c,v 1.17 2015/05/12 14:05:29 roy 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 1.17 2015/05/12 14:05:29 roy 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 #include "prog_ops.h"
  61
  62 static void in_constructor(void) __attribute__((constructor));
  63 static void in_status(prop_dictionary_t, prop_dictionary_t, bool);
  64 static void in_commit_address(prop_dictionary_t, prop_dictionary_t);
  65 static bool in_addr_tentative(struct ifaddrs *ifa);
  66 static void in_alias(const char *, prop_dictionary_t, prop_dictionary_t,
  67     struct in_aliasreq *);
  68
  69 static struct afswtch af = {
  70         .af_name = "inet", .af_af = AF_INET, .af_status = in_status,
  71         .af_addr_commit = in_commit_address,
  72         .af_addr_tentative = in_addr_tentative
  73 };
  74
  75 static void
  76 in_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
  77     struct in_aliasreq *creq)
  78 {
  79         struct ifreq ifr;
  80         bool alias;
  81         int s;
  82         unsigned short flags;
  83         struct in_aliasreq in_addreq;
  84         const struct sockaddr_in * const asin = &in_addreq.ifra_addr;
  85         const struct sockaddr_in * const dsin = &in_addreq.ifra_dstaddr;
  86         const struct sockaddr_in * const bsin = &in_addreq.ifra_broadaddr;
  87         char hbuf[NI_MAXHOST];
  88         const int niflag = Nflag ? 0 : NI_NUMERICHOST;
  89
  90         if (lflag)
  91                 return;
  92
  93         alias = true;
  94
  95         /* Get the non-alias address for this interface. */
  96         if ((s = getsock(AF_INET)) == -1) {
  97                 if (errno == EAFNOSUPPORT)
  98                         return;
  99                 err(EXIT_FAILURE, "socket");
 100         }
 101         memset(&ifr, 0, sizeof(ifr));
 102         estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 103         if (prog_ioctl(s, SIOCGIFADDR, &ifr) == -1) {
 104                 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
 105                         return;
 106                 warn("SIOCGIFADDR");
 107         }
 108         /* If creq and ifr are the same address, this is not an alias. */
 109         if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0)
 110                 alias = false;
 111         in_addreq = *creq;
 112         if (prog_ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) {
 113                 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
 114                         return;
 115                 } else
 116                         warn("SIOCGIFALIAS");
 117         }
 118
 119         if (getnameinfo((const struct sockaddr *)asin, asin->sin_len,
 120                         hbuf, sizeof(hbuf), NULL, 0, niflag))
 121                 strlcpy(hbuf, "", sizeof(hbuf));        /* some message? */
 122         printf("\tinet %s%s", alias ? "alias " : "", hbuf);
 123
 124         if (getifflags(env, oenv, &flags) == -1)
 125                 err(EXIT_FAILURE, "%s: getifflags", __func__);
 126
 127         if (flags & IFF_POINTOPOINT) {
 128                 if (getnameinfo((const struct sockaddr *)dsin, dsin->sin_len,
 129                                 hbuf, sizeof(hbuf), NULL, 0, niflag))
 130                         strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
 131                 printf(" -> %s", hbuf);
 132         }
 133
 134         printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr));
 135
 136         if (flags & IFF_BROADCAST) {
 137                 if (getnameinfo((const struct sockaddr *)bsin, bsin->sin_len,
 138                                 hbuf, sizeof(hbuf), NULL, 0, niflag))
 139                         strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
 140                 printf(" broadcast %s", hbuf);
 141         }
 142
 143 #ifdef IN_IFF_TENTATIVE
 144         memcpy(&ifr.ifr_addr, &creq->ifra_addr, creq->ifra_addr.sin_len);
 145         if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1) {
 146                 if (errno != EADDRNOTAVAIL)
 147                         warn("SIOCGIFAFLAG_IN");
 148         } else {
 149                 if (ifr.ifr_addrflags & IN_IFF_TENTATIVE)
 150                         printf(" tentative");
 151                 if (ifr.ifr_addrflags & IN_IFF_DUPLICATED)
 152                         printf(" duplicated");
 153                 if (ifr.ifr_addrflags & IN_IFF_DETACHED)
 154                         printf(" detached");
 155         }
 156 #endif
 157 }
 158
 159 static void
 160 in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
 161 {
 162         struct ifaddrs *ifap, *ifa;
 163         struct in_aliasreq ifra;
 164         bool printprefs = false;
 165         const char *ifname;
 166
 167         if ((ifname = getifname(env)) == NULL)
 168                 err(EXIT_FAILURE, "%s: getifname", __func__);
 169
 170         if (getifaddrs(&ifap) != 0)
 171                 err(EXIT_FAILURE, "getifaddrs");
 172
 173         printprefs = ifa_any_preferences(ifname, ifap, AF_INET);
 174
 175         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
 176                 if (strcmp(ifname, ifa->ifa_name) != 0)
 177                         continue;
 178                 if (ifa->ifa_addr->sa_family != AF_INET)
 179                         continue;
 180                 if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len)
 181                         continue;
 182
 183                 memset(&ifra, 0, sizeof(ifra));
 184                 estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name));
 185                 memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
 186                 in_alias(ifa->ifa_name, env, oenv, &ifra);
 187                 if (printprefs)
 188                         ifa_print_preference(ifa->ifa_name, ifa->ifa_addr);
 189                 printf("\n");
 190         }
 191         freeifaddrs(ifap);
 192 }
 193
 194 static void
 195 in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
 196 {
 197         struct ifreq in_ifr;
 198         struct in_aliasreq in_ifra;
 199         struct afparam inparam = {
 200                   .req = BUFPARAM(in_ifra)
 201                 , .dgreq = BUFPARAM(in_ifr)
 202                 , .name = {
 203                           {.buf = in_ifr.ifr_name,
 204                            .buflen = sizeof(in_ifr.ifr_name)}
 205                         , {.buf = in_ifra.ifra_name,
 206                            .buflen = sizeof(in_ifra.ifra_name)}
 207                   }
 208                 , .dgaddr = BUFPARAM(in_ifr.ifr_addr)
 209                 , .addr = BUFPARAM(in_ifra.ifra_addr)
 210                 , .dst = BUFPARAM(in_ifra.ifra_dstaddr)
 211                 , .brd = BUFPARAM(in_ifra.ifra_broadaddr)
 212                 , .mask = BUFPARAM(in_ifra.ifra_mask)
 213                 , .aifaddr = IFADDR_PARAM(SIOCAIFADDR)
 214                 , .difaddr = IFADDR_PARAM(SIOCDIFADDR)
 215                 , .gifaddr = IFADDR_PARAM(SIOCGIFADDR)
 216                 , .defmask = {.buf = NULL, .buflen = 0}
 217         };
 218         memset(&in_ifr, 0, sizeof(in_ifr));
 219         memset(&in_ifra, 0, sizeof(in_ifra));
 220         commit_address(env, oenv, &inparam);
 221 }
 222
 223 static bool
 224 in_addr_tentative(struct ifaddrs *ifa)
 225 {
 226 #ifdef IN_IFF_TENTATIVE
 227         int s;
 228         struct ifreq ifr;
 229
 230         memset(&ifr, 0, sizeof(ifr));
 231         strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
 232         ifr.ifr_addr = *ifa->ifa_addr;
 233         if ((s = getsock(AF_INET)) == -1)
 234                 err(EXIT_FAILURE, "%s: getsock", __func__);
 235         if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1)
 236                 err(EXIT_FAILURE, "SIOCGIFAFLAG_IN");
 237         return ifr.ifr_addrflags & IN_IFF_TENTATIVE ? true : false;
 238 #else
 239         return false;
 240 #endif
 241 }
 242
 243 static void
 244 in_constructor(void)
 245 {
 246         register_family(&af);
 247 }