contrib/bind-9.5.2/lib/isc/unix/interfaceiter.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: interfaceiter.c,v 1.42 2007/06/19 23:47:18 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <sys/types.h>
  25 #include <sys/ioctl.h>
  26 #ifdef HAVE_SYS_SOCKIO_H
  27 #include <sys/sockio.h>         /* Required for ifiter_ioctl.c. */
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <errno.h>
  34
  35 #include <isc/interfaceiter.h>
  36 #include <isc/log.h>
  37 #include <isc/magic.h>
  38 #include <isc/mem.h>
  39 #include <isc/msgs.h>
  40 #include <isc/net.h>
  41 #include <isc/print.h>
  42 #include <isc/result.h>
  43 #include <isc/strerror.h>
  44 #include <isc/string.h>
  45 #include <isc/types.h>
  46 #include <isc/util.h>
  47
  48 /* Must follow <isc/net.h>. */
  49 #ifdef HAVE_NET_IF6_H
  50 #include <net/if6.h>
  51 #endif
  52 #include <net/if.h>
  53
  54 /* Common utility functions */
  55
  56 /*%
  57  * Extract the network address part from a "struct sockaddr".
  58  * \brief
  59  * The address family is given explicitly
  60  * instead of using src->sa_family, because the latter does not work
  61  * for copying a network mask obtained by SIOCGIFNETMASK (it does
  62  * not have a valid address family).
  63  */
  64
  65 static void
  66 get_addr(unsigned int family, isc_netaddr_t *dst, struct sockaddr *src,
  67          char *ifname)
  68 {
  69         struct sockaddr_in6 *sa6;
  70
  71 #if !defined(ISC_PLATFORM_HAVEIFNAMETOINDEX) || \
  72     !defined(ISC_PLATFORM_HAVESCOPEID)
  73         UNUSED(ifname);
  74 #endif
  75
  76         /* clear any remaining value for safety */
  77         memset(dst, 0, sizeof(*dst));
  78
  79         dst->family = family;
  80         switch (family) {
  81         case AF_INET:
  82                 memcpy(&dst->type.in,
  83                        &((struct sockaddr_in *) src)->sin_addr,
  84                        sizeof(struct in_addr));
  85                 break;
  86         case AF_INET6:
  87                 sa6 = (struct sockaddr_in6 *)src;
  88                 memcpy(&dst->type.in6, &sa6->sin6_addr,
  89                        sizeof(struct in6_addr));
  90 #ifdef ISC_PLATFORM_HAVESCOPEID
  91                 if (sa6->sin6_scope_id != 0)
  92                         isc_netaddr_setzone(dst, sa6->sin6_scope_id);
  93                 else {
  94                         /*
  95                          * BSD variants embed scope zone IDs in the 128bit
  96                          * address as a kernel internal form.  Unfortunately,
  97                          * the embedded IDs are not hidden from applications
  98                          * when getting access to them by sysctl or ioctl.
  99                          * We convert the internal format to the pure address
 100                          * part and the zone ID part.
 101                          * Since multicast addresses should not appear here
 102                          * and they cannot be distinguished from netmasks,
 103                          * we only consider unicast link-local addresses.
 104                          */
 105                         if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
 106                                 isc_uint16_t zone16;
 107
 108                                 memcpy(&zone16, &sa6->sin6_addr.s6_addr[2],
 109                                        sizeof(zone16));
 110                                 zone16 = ntohs(zone16);
 111                                 if (zone16 != 0) {
 112                                         /* the zone ID is embedded */
 113                                         isc_netaddr_setzone(dst,
 114                                                             (isc_uint32_t)zone16);
 115                                         dst->type.in6.s6_addr[2] = 0;
 116                                         dst->type.in6.s6_addr[3] = 0;
 117 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
 118                                 } else if (ifname != NULL) {
 119                                         unsigned int zone;
 120
 121                                         /*
 122                                          * sin6_scope_id is still not provided,
 123                                          * but the corresponding interface name
 124                                          * is know.  Use the interface ID as
 125                                          * the link ID.
 126                                          */
 127                                         zone = if_nametoindex(ifname);
 128                                         if (zone != 0) {
 129                                                 isc_netaddr_setzone(dst,
 130                                                                     (isc_uint32_t)zone);
 131                                         }
 132 #endif
 133                                 }
 134                         }
 135                 }
 136 #endif
 137                 break;
 138         default:
 139                 INSIST(0);
 140                 break;
 141         }
 142 }
 143
 144 /*
 145  * Include system-dependent code.
 146  */
 147
 148 #if HAVE_GETIFADDRS
 149 #include "ifiter_getifaddrs.c"
 150 #elif HAVE_IFLIST_SYSCTL
 151 #include "ifiter_sysctl.c"
 152 #else
 153 #include "ifiter_ioctl.c"
 154 #endif
 155
 156 /*
 157  * The remaining code is common to the sysctl and ioctl case.
 158  */
 159
 160 isc_result_t
 161 isc_interfaceiter_current(isc_interfaceiter_t *iter,
 162                           isc_interface_t *ifdata)
 163 {
 164         REQUIRE(iter->result == ISC_R_SUCCESS);
 165         memcpy(ifdata, &iter->current, sizeof(*ifdata));
 166         return (ISC_R_SUCCESS);
 167 }
 168
 169 isc_result_t
 170 isc_interfaceiter_first(isc_interfaceiter_t *iter) {
 171         isc_result_t result;
 172
 173         REQUIRE(VALID_IFITER(iter));
 174
 175         internal_first(iter);
 176         for (;;) {
 177                 result = internal_current(iter);
 178                 if (result != ISC_R_IGNORE)
 179                         break;
 180                 result = internal_next(iter);
 181                 if (result != ISC_R_SUCCESS)
 182                         break;
 183         }
 184         iter->result = result;
 185         return (result);
 186 }
 187
 188 isc_result_t
 189 isc_interfaceiter_next(isc_interfaceiter_t *iter) {
 190         isc_result_t result;
 191
 192         REQUIRE(VALID_IFITER(iter));
 193         REQUIRE(iter->result == ISC_R_SUCCESS);
 194
 195         for (;;) {
 196                 result = internal_next(iter);
 197                 if (result != ISC_R_SUCCESS)
 198                         break;
 199                 result = internal_current(iter);
 200                 if (result != ISC_R_IGNORE)
 201                         break;
 202         }
 203         iter->result = result;
 204         return (result);
 205 }
 206
 207 void
 208 isc_interfaceiter_destroy(isc_interfaceiter_t **iterp)
 209 {
 210         isc_interfaceiter_t *iter;
 211         REQUIRE(iterp != NULL);
 212         iter = *iterp;
 213         REQUIRE(VALID_IFITER(iter));
 214
 215         internal_destroy(iter);
 216         if (iter->buf != NULL)
 217                 isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
 218
 219         iter->magic = 0;
 220         isc_mem_put(iter->mctx, iter, sizeof(*iter));
 221         *iterp = NULL;
 222 }