Resolving MAC of a remote machine C++

[thelonesquirrely]

Hey,

So I am working in an embedded environment (on a virtex 5 for those who care) and I need a way that I can find the MAC address of a computer given its IP/port from C++ code. I need to pass it to a different module.

Is there some standard c++ library that will let me retrieve this as a string/int/etc...I can handle the parsing afterward.

Thanks!

[BobS0327]

One possible solution would be to query the remote machine for the MAC...

#define _WIN32_DCOM
#include <iostream>

#include <comdef.h>
#include <Wbemidl.h>
# pragma comment(lib, "wbemuuid.lib")
# pragma comment(lib, "credui.lib")
#include <wincred.h>

using namespace std;

int main(void)
{
	HRESULT hres;
	hres =  CoInitializeEx(0, COINIT_MULTITHREADED); 
	if (FAILED(hres))
	{
		cout << "Failed to initialize COM library. Error code = 0x" 
			<< hex << hres << endl;
		return 1;                  
	}
	hres =  CoInitializeSecurity(
		NULL, 
		-1,                          
		NULL,                        
		NULL,                        
		RPC_C_AUTHN_LEVEL_DEFAULT,   
		RPC_C_IMP_LEVEL_IMPERSONATE, 
		NULL,                        
		EOAC_NONE,                   
		NULL                         
		);
	if (FAILED(hres))
	{
		cout << "Failed to initialize security. Error code = 0x" 
			<< hex << hres << endl;
		CoUninitialize();
		return 1;                    
	}
	IWbemLocator *pLoc = NULL;
	hres = CoCreateInstance(
		CLSID_WbemLocator,             
		0, 
		CLSCTX_INPROC_SERVER, 
		IID_IWbemLocator, (LPVOID *) &pLoc);
	if (FAILED(hres))
	{
		cout << "Failed to create IWbemLocator object."
			<< " Err code = 0x"
			<< hex << hres << endl;
		CoUninitialize();
		return 1;                 
	}
	IWbemServices *pSvc = NULL;
	hres = pLoc->ConnectServer(
		_bstr_t(L"\\\\Net0\\root\\cimv2"),
		_bstr_t(L"Net0\\Joe"),           // Local Admin User name
		_bstr_t(L"ABC123"),                // Local Admin User password
		_bstr_t(L"MS_409"),                 // Locale             
		NULL,                               // Security flags
		_bstr_t(L""),                       // Authority        
		0,                                  // Context object 
		&pSvc                               // IWbemServices proxy
		);
	if (FAILED(hres))
	{
		cout << "Could not connect. Error code = 0x" 
			<< hex << hres << endl;
		pLoc->Release();     
		CoUninitialize();
		return 1;               
	}
	cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl;
	hres = CoSetProxyBlanket(
		pSvc,                        
		RPC_C_AUTHN_WINNT,           
		RPC_C_AUTHZ_NONE,            
		NULL,                        
		RPC_C_AUTHN_LEVEL_CALL,      
		RPC_C_IMP_LEVEL_IMPERSONATE, 
		NULL,                        
		EOAC_NONE                    
		);
	if (FAILED(hres))
	{
		cout << "Could not set proxy blanket. Error code = 0x" 
			<< hex << hres << endl;
		pSvc->Release();
		pLoc->Release();     
		CoUninitialize();
		return 1;               
	}
	IEnumWbemClassObject* pEnumerator = NULL;
	IWbemClassObject *pclsObj;
	ULONG uReturn = 0;
	BSTR strQuery = (L"SELECT * FROM Win32_NetworkAdapterConfiguration WHERE IPEnabled = True");
	BSTR strQL = (L"WQL");
	hres = pSvc->ExecQuery(strQL, strQuery,
		WBEM_FLAG_RETURN_IMMEDIATELY,NULL,&pEnumerator);

	while (pEnumerator)
	{
		HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
			&pclsObj, &uReturn);

		if(0 == uReturn) break;
		VARIANT vtProp;
		hr = pclsObj->Get(L"MacAddress", 0, &vtProp, 0, 0);
		wcout << " Mac Address : " << vtProp.bstrVal << endl;
		VariantClear(&vtProp);
	}
	pSvc->Release();
	pLoc->Release();
	pEnumerator->Release();
	pclsObj->Release();
	CoUninitialize();
	return 0;   
}

Note that you'll have to use an account with Admin privileges on the targeted computer.