Dexter retrieve active network interface physical address (MAC) snippet

libsysteminfo.cpp

//https://github.com/twelvesec/dexter
//GNU General Public License v3.0
//@maldevel

//...

std::string libsysteminfo::get_active_netface_mac(void) {
	std::string mac = "";
	DWORD size = 0;
	ULONG result = 0;
	PIP_ADAPTER_ADDRESSES aAddr = NULL;
	PIP_ADAPTER_ADDRESSES aAddrIndex = NULL;
	PIP_ADAPTER_UNICAST_ADDRESS aAddrUnicast = NULL;

	char *buf;
	unsigned long bufSize = 50;

	if ((result = GetAdaptersAddresses(0, 0, 0, 0, &size)) != ERROR_BUFFER_OVERFLOW) {
		return "";
	}

	if ((aAddr = (PIP_ADAPTER_ADDRESSES)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size)) == NULL) {
		return "";
	}

	if (GetAdaptersAddresses(AF_INET, GAA_FLAG_INCLUDE_PREFIX, 0, aAddr, &size) != NO_ERROR) {
		HeapFree(GetProcessHeap(), 0, aAddr);
		aAddr = NULL;
		return "";
	}

	aAddrIndex = aAddr;

	while (aAddrIndex) {
		if ((aAddrIndex->IfType == 6 || aAddrIndex->IfType == 71) && aAddrIndex->OperStatus == 1 &&
			std::wstring(aAddrIndex->Description).find(L"Hyper-V") == std::string::npos &&
			std::wstring(aAddrIndex->Description).find(L"VirtualBox") == std::string::npos &&
			std::wstring(aAddrIndex->Description).find(L"VMware") == std::string::npos) {

			if ((buf = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, bufSize)) == NULL) {
				continue;
			}

			_snprintf_s(buf, bufSize, _TRUNCATE, "%02X-%02X-%02X-%02X-%02X-%02X", aAddrIndex->PhysicalAddress[0], aAddrIndex->PhysicalAddress[1],
				aAddrIndex->PhysicalAddress[2], aAddrIndex->PhysicalAddress[3], aAddrIndex->PhysicalAddress[4], aAddrIndex->PhysicalAddress[5]);
			mac = std::string(buf);
			HeapFree(GetProcessHeap(), 0, buf);
			buf = NULL;
		}
		aAddrIndex = aAddrIndex->Next;
	}

	HeapFree(GetProcessHeap(), 0, aAddr);
	aAddr = NULL;

	return mac;
}