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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* portable interface index to socket address function.
*
* Copyright (c) 2006-2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <impl/i18n.h>
#include <impl/framework.h>
//#define INDEXTOADDR_DEBUG
/* interfaces indexes refer to the link layer, we want to find the internet layer address.
* the big problem is that multiple IPv6 addresses can be bound to one link - called scopes.
* we can just pick the first scope and let IP routing handle the rest.
*/
bool
pgm_if_indextoaddr (
const unsigned ifindex,
const sa_family_t iffamily,
const uint32_t ifscope,
struct sockaddr* restrict ifsa,
pgm_error_t** restrict error
)
{
pgm_return_val_if_fail (NULL != ifsa, FALSE);
if (0 == ifindex) /* any interface or address */
{
ifsa->sa_family = iffamily;
switch (iffamily) {
case AF_INET:
((struct sockaddr_in*)ifsa)->sin_addr.s_addr = INADDR_ANY;
break;
case AF_INET6:
((struct sockaddr_in6*)ifsa)->sin6_addr = in6addr_any;
break;
default:
pgm_return_val_if_reached (FALSE);
break;
}
return TRUE;
}
struct pgm_ifaddrs_t *ifap, *ifa;
if (!pgm_getifaddrs (&ifap, error)) {
pgm_prefix_error (error,
_("Enumerating network interfaces: "));
return FALSE;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next)
{
if (NULL == ifa->ifa_addr ||
ifa->ifa_addr->sa_family != iffamily)
continue;
const unsigned i = pgm_if_nametoindex (iffamily, ifa->ifa_name);
pgm_assert (0 != i);
if (i == ifindex)
{
if (ifscope && ifscope != pgm_sockaddr_scope_id (ifa->ifa_addr))
continue;
memcpy (ifsa, ifa->ifa_addr, pgm_sockaddr_len(ifa->ifa_addr));
pgm_freeifaddrs (ifap);
return TRUE;
}
}
pgm_set_error (error,
PGM_ERROR_DOMAIN_IF,
PGM_ERROR_NODEV,
_("No matching network interface index: %i"),
ifindex);
pgm_freeifaddrs (ifap);
return FALSE;
}
/* eof */
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