usr/src/lib/libinetutil/common/ifaddrlistx.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  *
  21  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  22  * Use is subject to license terms.
  23  */
  24
  25 #include <errno.h>
  26 #include <libinetutil.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/socket.h>
  32 #include <sys/sockio.h>
  33
  34 /*
  35  * Create a list of the addresses on physical interface `ifname' with at least
  36  * one of the flags in `set' set and all of the flags in `clear' clear.
  37  * Return the number of items in the list, or -1 on failure.
  38  */
  39 int
  40 ifaddrlistx(const char *ifname, uint64_t set, uint64_t clear,
  41     ifaddrlistx_t **ifaddrsp)
  42 {
  43         struct lifconf  lifc;
  44         struct lifnum   lifn;
  45         struct lifreq   *lifrp;
  46         ifaddrlistx_t   *ifaddrp, *ifaddrs = NULL;
  47         int             i, nlifr, naddr = 0;
  48         char            *cp;
  49         uint_t          flags;
  50         int             s4, s6 = -1;
  51         boolean_t       isv6;
  52         int             save_errno;
  53         struct sockaddr_storage addr;
  54
  55         (void) memset(&lifc, 0, sizeof (lifc));
  56         flags = LIFC_NOXMIT | LIFC_ALLZONES | LIFC_TEMPORARY | LIFC_UNDER_IPMP;
  57
  58         /*
  59          * We need both IPv4 and IPv6 sockets to query both IPv4 and IPv6
  60          * interfaces below.
  61          */
  62         if ((s4 = socket(AF_INET, SOCK_DGRAM, 0)) == -1 ||
  63             (s6 = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
  64                 goto fail;
  65         }
  66
  67         /*
  68          * Get the number of network interfaces of type `family'.
  69          */
  70         lifn.lifn_family = AF_UNSPEC;
  71         lifn.lifn_flags = flags;
  72 again:
  73         if (ioctl(s4, SIOCGLIFNUM, &lifn) == -1)
  74                 goto fail;
  75
  76         /*
  77          * Pad the interface count to detect when additional interfaces have
  78          * been configured between SIOCGLIFNUM and SIOCGLIFCONF.
  79          */
  80         lifn.lifn_count += 4;
  81
  82         lifc.lifc_flags = flags;
  83         lifc.lifc_family = AF_UNSPEC;
  84         lifc.lifc_len = lifn.lifn_count * sizeof (struct lifreq);
  85         if ((lifc.lifc_buf = realloc(lifc.lifc_buf, lifc.lifc_len)) == NULL)
  86                 goto fail;
  87
  88         if (ioctl(s4, SIOCGLIFCONF, &lifc) == -1)
  89                 goto fail;
  90
  91         /*
  92          * If every lifr_req slot is taken, then additional interfaces must
  93          * have been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF.
  94          * Recalculate to make sure we didn't miss any interfaces.
  95          */
  96         nlifr = lifc.lifc_len / sizeof (struct lifreq);
  97         if (nlifr >= lifn.lifn_count)
  98                 goto again;
  99
 100         /*
 101          * Populate the ifaddrlistx by querying each matching interface.  If a
 102          * query ioctl returns ENXIO, then the interface must have been
 103          * removed after the SIOCGLIFCONF completed -- so we just ignore it.
 104          */
 105         for (lifrp = lifc.lifc_req, i = 0; i < nlifr; i++, lifrp++) {
 106                 if ((cp = strchr(lifrp->lifr_name, ':')) != NULL)
 107                         *cp = '\0';
 108
 109                 if (strcmp(lifrp->lifr_name, ifname) != 0)
 110                         continue;
 111
 112                 if (cp != NULL)
 113                         *cp = ':';
 114
 115                 addr = lifrp->lifr_addr;
 116                 isv6 = addr.ss_family == AF_INET6;
 117                 if (ioctl(isv6 ? s6 : s4, SIOCGLIFFLAGS, lifrp) == -1) {
 118                         if (errno == ENXIO)
 119                                 continue;
 120                         goto fail;
 121                 }
 122
 123                 if (set != 0 && ((lifrp->lifr_flags & set) == 0) ||
 124                     (lifrp->lifr_flags & clear) != 0)
 125                         continue;
 126
 127                 /*
 128                  * We've got a match; allocate a new record.
 129                  */
 130                 if ((ifaddrp = malloc(sizeof (ifaddrlistx_t))) == NULL)
 131                         goto fail;
 132
 133                 (void) strlcpy(ifaddrp->ia_name, lifrp->lifr_name, LIFNAMSIZ);
 134                 ifaddrp->ia_flags = lifrp->lifr_flags;
 135                 ifaddrp->ia_addr = addr;
 136                 ifaddrp->ia_next = ifaddrs;
 137                 ifaddrs = ifaddrp;
 138                 naddr++;
 139         }
 140
 141         (void) close(s4);
 142         (void) close(s6);
 143         free(lifc.lifc_buf);
 144         *ifaddrsp = ifaddrs;
 145         return (naddr);
 146 fail:
 147         save_errno = errno;
 148         (void) close(s4);
 149         (void) close(s6);
 150         free(lifc.lifc_buf);
 151         ifaddrlistx_free(ifaddrs);
 152         errno = save_errno;
 153         return (-1);
 154 }
 155
 156 /*
 157  * Free the provided ifaddrlistx_t.
 158  */
 159 void
 160 ifaddrlistx_free(ifaddrlistx_t *ifaddrp)
 161 {
 162         ifaddrlistx_t *next_ifaddrp;
 163
 164         for (; ifaddrp != NULL; ifaddrp = next_ifaddrp) {
 165                 next_ifaddrp = ifaddrp->ia_next;
 166                 free(ifaddrp);
 167         }
 168 }