Resolving MAC of a remote machine C++
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Thread: Resolving MAC of a remote machine C++

  1. #1
    Join Date
    Jan 2009
    Posts
    1

    Resolving MAC of a remote machine C++

    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!

  2. #2
    Join Date
    Apr 2004
    Posts
    100

    Re: Resolving MAC of a remote machine C++

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

    Code:
    #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.

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