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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* Windows interface name to interface index 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
*/
#ifdef _WIN32
# include <ws2tcpip.h>
# include <iphlpapi.h>
#endif
#include <impl/i18n.h>
#include <impl/framework.h>
//#define NAMETOINDEX_DEBUG
#define MAX_TRIES 3
#define DEFAULT_BUFFER_SIZE 4096
#ifdef _WIN32
static inline
void*
_pgm_heap_alloc (
const size_t n_bytes
)
{
# ifdef CONFIG_USE_HEAPALLOC
return HeapAlloc (GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS, n_bytes);
# else
return pgm_malloc (n_bytes);
# endif
}
static inline
void
_pgm_heap_free (
void* mem
)
{
# ifdef CONFIG_USE_HEAPALLOC
HeapFree (GetProcessHeap(), 0, mem);
# else
pgm_free (mem);
# endif
}
/* Retrieve adapter index via name.
* Wine edition: First try GetAdapterIndex() then fallback to enumerating
* adapters via GetAdaptersInfo().
*
* On error returns zero, no errors are defined.
*/
static
unsigned /* type matching if_nametoindex() */
_pgm_getadaptersinfo_nametoindex (
const sa_family_t iffamily,
const char* ifname
)
{
pgm_return_val_if_fail (NULL != ifname, 0);
pgm_assert (AF_INET6 != iffamily);
DWORD dwRet, ifIndex;
ULONG ulOutBufLen = DEFAULT_BUFFER_SIZE;
PIP_ADAPTER_INFO pAdapterInfo = NULL;
PIP_ADAPTER_INFO pAdapter = NULL;
/* loop to handle interfaces coming online causing a buffer overflow
* between first call to list buffer length and second call to enumerate.
*/
for (unsigned i = MAX_TRIES; i; i--)
{
pgm_debug ("IP_ADAPTER_INFO buffer length %lu bytes.", ulOutBufLen);
pAdapterInfo = (IP_ADAPTER_INFO*)_pgm_heap_alloc (ulOutBufLen);
dwRet = GetAdaptersInfo (pAdapterInfo, &ulOutBufLen);
if (ERROR_BUFFER_OVERFLOW == dwRet) {
_pgm_heap_free (pAdapterInfo);
pAdapterInfo = NULL;
} else {
break;
}
}
switch (dwRet) {
case ERROR_SUCCESS: /* NO_ERROR */
break;
case ERROR_BUFFER_OVERFLOW:
pgm_warn (_("GetAdaptersInfo repeatedly failed with ERROR_BUFFER_OVERFLOW."));
if (pAdapterInfo)
_pgm_heap_free (pAdapterInfo);
return 0;
default:
pgm_warn (_("GetAdaptersInfo failed"));
if (pAdapterInfo)
_pgm_heap_free (pAdapterInfo);
return 0;
}
for (pAdapter = pAdapterInfo;
pAdapter;
pAdapter = pAdapter->Next)
{
for (IP_ADDR_STRING *pIPAddr = &pAdapter->IpAddressList;
pIPAddr;
pIPAddr = pIPAddr->Next)
{
/* skip null adapters */
if (strlen (pIPAddr->IpAddress.String) == 0)
continue;
if (0 == strncmp (ifname, pAdapter->AdapterName, IF_NAMESIZE)) {
ifIndex = pAdapter->Index;
_pgm_heap_free (pAdapterInfo);
return ifIndex;
}
}
}
if (pAdapterInfo)
_pgm_heap_free (pAdapterInfo);
return 0;
}
/* Retrieve adapter index via name.
* Windows edition: First try GetAdapterIndex() then fallback to enumerating
* adapters via GetAdaptersAddresses().
*
* On error returns zero, no errors are defined.
*/
static
unsigned /* type matching if_nametoindex() */
_pgm_getadaptersaddresses_nametoindex (
const sa_family_t iffamily,
const char* ifname
)
{
pgm_return_val_if_fail (NULL != ifname, 0);
ULONG ifIndex;
DWORD dwSize = DEFAULT_BUFFER_SIZE, dwRet;
IP_ADAPTER_ADDRESSES *pAdapterAddresses = NULL, *adapter;
/* first see if GetAdapterIndex is working
*/
dwRet = GetAdapterIndex ((const LPWSTR)ifname, &ifIndex);
if (NO_ERROR == dwRet)
return ifIndex;
/* fallback to finding index via iterating adapter list */
/* loop to handle interfaces coming online causing a buffer overflow
* between first call to list buffer length and second call to enumerate.
*/
for (unsigned i = MAX_TRIES; i; i--)
{
pAdapterAddresses = (IP_ADAPTER_ADDRESSES*)_pgm_heap_alloc (dwSize);
dwRet = GetAdaptersAddresses (AF_UNSPEC,
GAA_FLAG_SKIP_ANYCAST |
GAA_FLAG_SKIP_DNS_SERVER |
GAA_FLAG_SKIP_FRIENDLY_NAME |
GAA_FLAG_SKIP_MULTICAST,
NULL,
pAdapterAddresses,
&dwSize);
if (ERROR_BUFFER_OVERFLOW == dwRet) {
_pgm_heap_free (pAdapterAddresses);
pAdapterAddresses = NULL;
} else {
break;
}
}
switch (dwRet) {
case ERROR_SUCCESS:
break;
case ERROR_BUFFER_OVERFLOW:
pgm_warn (_("GetAdaptersAddresses repeatedly failed with ERROR_BUFFER_OVERFLOW"));
if (pAdapterAddresses)
_pgm_heap_free (pAdapterAddresses);
return 0;
default:
pgm_warn (_("GetAdaptersAddresses failed"));
if (pAdapterAddresses)
_pgm_heap_free (pAdapterAddresses);
return 0;
}
for (adapter = pAdapterAddresses;
adapter;
adapter = adapter->Next)
{
if (0 == strcmp (ifname, adapter->AdapterName)) {
ifIndex = AF_INET6 == iffamily ? adapter->Ipv6IfIndex : adapter->IfIndex;
_pgm_heap_free (pAdapterAddresses);
return ifIndex;
}
}
if (pAdapterAddresses)
_pgm_heap_free (pAdapterAddresses);
return 0;
}
#endif /* _WIN32 */
/* Retrieve interface index for a specified adapter name.
* On error returns zero, no errors are defined.
*/
unsigned /* type matching if_nametoindex() */
pgm_if_nametoindex (
#ifndef _WIN32
PGM_GNUC_UNUSED const sa_family_t iffamily,
#else
const sa_family_t iffamily,
#endif
const char* ifname
)
{
pgm_return_val_if_fail (NULL != ifname, 0);
#ifndef _WIN32
return if_nametoindex (ifname);
#elif defined(CONFIG_TARGET_WINE)
return _pgm_getadaptersinfo_nametoindex (iffamily, ifname);
#else
return _pgm_getadaptersaddresses_nametoindex (iffamily, ifname);
#endif
}
/* eof */
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