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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <errno.h>
#include <libinetutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/sockio.h>
/*
* Create a list of the addresses on physical interface `ifname' with at least
* one of the flags in `set' set and all of the flags in `clear' clear.
* Return the number of items in the list, or -1 on failure.
*/
int
ifaddrlistx(const char *ifname, uint64_t set, uint64_t clear,
ifaddrlistx_t **ifaddrsp)
{
struct lifconf lifc;
struct lifnum lifn;
struct lifreq *lifrp;
ifaddrlistx_t *ifaddrp, *ifaddrs = NULL;
int i, nlifr, naddr = 0;
char *cp;
uint_t flags;
int s4, s6 = -1;
boolean_t isv6;
int save_errno;
struct sockaddr_storage addr;
(void) memset(&lifc, 0, sizeof (lifc));
flags = LIFC_NOXMIT | LIFC_ALLZONES | LIFC_TEMPORARY | LIFC_UNDER_IPMP;
/*
* We need both IPv4 and IPv6 sockets to query both IPv4 and IPv6
* interfaces below.
*/
if ((s4 = socket(AF_INET, SOCK_DGRAM, 0)) == -1 ||
(s6 = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
goto fail;
}
/*
* Get the number of network interfaces of type `family'.
*/
lifn.lifn_family = AF_UNSPEC;
lifn.lifn_flags = flags;
again:
if (ioctl(s4, SIOCGLIFNUM, &lifn) == -1)
goto fail;
/*
* Pad the interface count to detect when additional interfaces have
* been configured between SIOCGLIFNUM and SIOCGLIFCONF.
*/
lifn.lifn_count += 4;
lifc.lifc_flags = flags;
lifc.lifc_family = AF_UNSPEC;
lifc.lifc_len = lifn.lifn_count * sizeof (struct lifreq);
if ((lifc.lifc_buf = realloc(lifc.lifc_buf, lifc.lifc_len)) == NULL)
goto fail;
if (ioctl(s4, SIOCGLIFCONF, &lifc) == -1)
goto fail;
/*
* If every lifr_req slot is taken, then additional interfaces must
* have been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF.
* Recalculate to make sure we didn't miss any interfaces.
*/
nlifr = lifc.lifc_len / sizeof (struct lifreq);
if (nlifr >= lifn.lifn_count)
goto again;
/*
* Populate the ifaddrlistx by querying each matching interface. If a
* query ioctl returns ENXIO, then the interface must have been
* removed after the SIOCGLIFCONF completed -- so we just ignore it.
*/
for (lifrp = lifc.lifc_req, i = 0; i < nlifr; i++, lifrp++) {
if ((cp = strchr(lifrp->lifr_name, ':')) != NULL)
*cp = '\0';
if (strcmp(lifrp->lifr_name, ifname) != 0)
continue;
if (cp != NULL)
*cp = ':';
addr = lifrp->lifr_addr;
isv6 = addr.ss_family == AF_INET6;
if (ioctl(isv6 ? s6 : s4, SIOCGLIFFLAGS, lifrp) == -1) {
if (errno == ENXIO)
continue;
goto fail;
}
if (set != 0 && ((lifrp->lifr_flags & set) == 0) ||
(lifrp->lifr_flags & clear) != 0)
continue;
/*
* We've got a match; allocate a new record.
*/
if ((ifaddrp = malloc(sizeof (ifaddrlistx_t))) == NULL)
goto fail;
(void) strlcpy(ifaddrp->ia_name, lifrp->lifr_name, LIFNAMSIZ);
ifaddrp->ia_flags = lifrp->lifr_flags;
ifaddrp->ia_addr = addr;
ifaddrp->ia_next = ifaddrs;
ifaddrs = ifaddrp;
naddr++;
}
(void) close(s4);
(void) close(s6);
free(lifc.lifc_buf);
*ifaddrsp = ifaddrs;
return (naddr);
fail:
save_errno = errno;
(void) close(s4);
(void) close(s6);
free(lifc.lifc_buf);
ifaddrlistx_free(ifaddrs);
errno = save_errno;
return (-1);
}
/*
* Free the provided ifaddrlistx_t.
*/
void
ifaddrlistx_free(ifaddrlistx_t *ifaddrp)
{
ifaddrlistx_t *next_ifaddrp;
for (; ifaddrp != NULL; ifaddrp = next_ifaddrp) {
next_ifaddrp = ifaddrp->ia_next;
free(ifaddrp);
}
}
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