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37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
#include "netif.h"
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#include "util/mallocHelper.h"
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#include <ws2tcpip.h> // AF_INET6, IN6_IS_ADDR_UNSPECIFIED
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#include <iphlpapi.h>
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bool ffNetifGetDefaultRouteImpl(FF_MAYBE_UNUSED char iface[IF_NAMESIZE + 1], uint32_t* ifIndex)
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{
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PMIB_IPFORWARD_TABLE2 pIpForwardTable = NULL;
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DWORD result = GetIpForwardTable2(AF_UNSPEC, &pIpForwardTable);
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if (result != NO_ERROR)
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return false;
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bool foundDefault = false;
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for (ULONG i = 0; i < pIpForwardTable->NumEntries; ++i)
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{
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MIB_IPFORWARD_ROW2* row = &pIpForwardTable->Table[i];
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if ((row->DestinationPrefix.PrefixLength == 0) &&
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((row->DestinationPrefix.Prefix.Ipv4.sin_family == AF_INET &&
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row->DestinationPrefix.Prefix.Ipv4.sin_addr.S_un.S_addr == 0) ||
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(row->DestinationPrefix.Prefix.Ipv6.sin6_family == AF_INET6 &&
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IN6_IS_ADDR_UNSPECIFIED(&row->DestinationPrefix.Prefix.Ipv6.sin6_addr))))
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{
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*ifIndex = row->InterfaceIndex;
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foundDefault = true;
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break;
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}
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}
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FreeMibTable(pIpForwardTable);
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return foundDefault;
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}
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