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#include "common/netif.h"
#include <ws2tcpip.h> // AF_INET6, IN6_IS_ADDR_UNSPECIFIED
#include <iphlpapi.h>
bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result) {
PMIB_IPFORWARD_TABLE2 pIpForwardTable = NULL;
if (!NETIO_SUCCESS(GetIpForwardTable2(AF_INET, &pIpForwardTable))) {
return false;
}
bool foundDefault = false;
uint32_t smallestMetric = UINT32_MAX;
for (ULONG i = 0; i < pIpForwardTable->NumEntries; ++i) {
MIB_IPFORWARD_ROW2* row = &pIpForwardTable->Table[i];
if (row->DestinationPrefix.PrefixLength == 0 &&
row->DestinationPrefix.Prefix.Ipv4.sin_addr.S_un.S_addr == 0) {
MIB_IF_ROW2 ifRow = {
.InterfaceIndex = row->InterfaceIndex,
};
if (NETIO_SUCCESS(GetIfEntry2(&ifRow)) && ifRow.OperStatus == IfOperStatusUp) {
MIB_IPINTERFACE_ROW ipInterfaceRow = {
.Family = AF_INET,
.InterfaceIndex = row->InterfaceIndex,
};
uint32_t realMetric = row->Metric /* Metric offset */;
if (NETIO_SUCCESS(GetIpInterfaceEntry(&ipInterfaceRow))) {
realMetric += ipInterfaceRow.Metric /* Interface metric */;
}
if (realMetric < smallestMetric) {
smallestMetric = realMetric;
result->ifIndex = row->InterfaceIndex;
foundDefault = true;
}
}
}
}
FreeMibTable(pIpForwardTable);
return foundDefault;
}
bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result) {
PMIB_IPFORWARD_TABLE2 pIpForwardTable = NULL;
if (!NETIO_SUCCESS(GetIpForwardTable2(AF_INET6, &pIpForwardTable))) {
return false;
}
bool foundDefault = false;
uint32_t smallestMetric = UINT32_MAX;
for (ULONG i = 0; i < pIpForwardTable->NumEntries; ++i) {
MIB_IPFORWARD_ROW2* row = &pIpForwardTable->Table[i];
if (row->DestinationPrefix.PrefixLength == 0 &&
IN6_IS_ADDR_UNSPECIFIED(&row->DestinationPrefix.Prefix.Ipv6.sin6_addr)) {
MIB_IF_ROW2 ifRow = {
.InterfaceIndex = row->InterfaceIndex,
};
if (NETIO_SUCCESS(GetIfEntry2(&ifRow)) && ifRow.OperStatus == IfOperStatusUp) {
MIB_IPINTERFACE_ROW ipInterfaceRow = {
.Family = AF_INET6,
.InterfaceIndex = row->InterfaceIndex,
};
uint32_t realMetric = row->Metric /* Metric offset */;
if (NETIO_SUCCESS(GetIpInterfaceEntry(&ipInterfaceRow))) {
realMetric += ipInterfaceRow.Metric /* Interface metric */;
}
if (realMetric < smallestMetric) {
smallestMetric = realMetric;
result->ifIndex = row->InterfaceIndex;
foundDefault = true;
}
}
}
}
FreeMibTable(pIpForwardTable);
return foundDefault;
}
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