how to find MAC address

Hello,
Please tell me how can I find mac adress(physical address of network interface card) with out using any of net bios
protocol or winipcfg or ipconfig commands.That is to get mac address
using c or c++ language program.Is there any interrupt no for it
Please send me any relevent material or any site .

[Derek Viljoen]

If you mean without using command-line utilities then you should refer to MSDN Article Q118623.

It requires that netbios be bound to the adapter in question.

Here's their source code:

#include <windows.h>
#include <wincon.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

typedef struct _ASTAT_
{
ADAPTER_STATUS adapt;
NAME_BUFFER NameBuff [30];
}ASTAT, * PASTAT;

ASTAT Adapter;

void main (void)
{
NCB Ncb;
UCHAR uRetCode;
char NetName[50];
LANA_ENUM lenum;
int i;

memset( &Ncb, 0, sizeof(Ncb) );
Ncb.ncb_command = NCBENUM;
Ncb.ncb_buffer = (UCHAR *)&lenum;
Ncb.ncb_length = sizeof(lenum);
uRetCode = Netbios( &Ncb );
printf( "The NCBENUM return code is: 0x%x \n", uRetCode );

for(i=0; i < lenum.length ;i++)
{
memset( &Ncb, 0, sizeof(Ncb) );
Ncb.ncb_command = NCBRESET;
Ncb.ncb_lana_num = lenum.lana[i];

uRetCode = Netbios( &Ncb );
printf( "The NCBRESET on LANA %d return code is: 0x%x \n",
lenum.lana[i], uRetCode );

memset( &Ncb, 0, sizeof (Ncb) );
Ncb.ncb_command = NCBASTAT;
Ncb.ncb_lana_num = lenum.lana[i];

strcpy( Ncb.ncb_callname, "* " );
Ncb.ncb_buffer = (char *) &Adapter;
Ncb.ncb_length = sizeof(Adapter);

uRetCode = Netbios( &Ncb );
printf( "The NCBASTAT on LANA %d return code is: 0x%x \n",
lenum.lana[i], uRetCode );
if ( uRetCode == 0 )
{
printf( "The Ethernet Number on LANA %d is:
%02x%02x%02x%02x%02x%02x\n",
lenum.lana[i],
Adapter.adapt.adapter_address[0],
Adapter.adapt.adapter_address[1],
Adapter.adapt.adapter_address[2],
Adapter.adapt.adapter_address[3],
Adapter.adapt.adapter_address[4],
Adapter.adapt.adapter_address[5] );
}
}
}




Derek Viljoen
[email protected]

[abrar]

I think you are wel in network programming can you tell me that how to get mac frame comming on default gateway on windows nt network

[Derek Viljoen]

Actually, the only thing this proves is that I know how to search for the keywords "MAC address" on MSDN web site. Sorry, I don't know specifically how to do what you want.

I do know that you need to put your network adapter in "permiscuous" mode, and be on the same subnet as the machine you are interested in tracing.

Actually, Linux has a utility for this called tcpdump which will give you dumps of all packets seen by an adapter on its subnet. You might do a websearch for a windows port of that utility.

Derek Viljoen
[email protected]

derek, how stupit you are and non sense too.you don't know how to deal with an asian boy.I asked you a question .If you don't know the answer just say I don't know.

[Derek Viljoen]

Sorry, but I don't understand how I insulted you. If you'd like to talk about this offline, please send me your email.

This method does not require the netbios protocol to be attached. It is a bit of a hack but after a fair amount of research it is the best I can find.

This works based on the algorithm used to create GUIDs. Microsoft is using unpublished system APIs to retrieve the MAC id. This is used as the last 6 bytes of the GUIDs generated on any machine. So we call UuidCreate (rpcrt4.lib) to generate a guid and read off uuid.Data4[2] - [7].

(Actually in my code I use CoCreateGuid (ole32.lib) which in turn calls UuidCreate so that users of my lib don't need to include libcrt4.lib)

static CString getMACID()
{
// TODO: - find less hacky way of getting MAC

// Ask RPC to create a UUID for us. If this machine has an Ethernet
// adapter, the last six bytes of the UUID (bytes 2-7 inclusive in
// the Data4 element) should be the MAC address of the local
// Ethernet adapter.
UUID uuid;
UuidCreate(&uuid);

CString macID;
macID.Format("%02d:%02:%02d:%02d:%02d:%02d", int(uuid.Data4[2]), int(uuid.Data4[3]), int(uuid.Data4[4]),
int(uuid.Data4[5]), int(uuid.Data4[6]), int(uuid.Data4[7]));


return macID;
}

I'd also used this approach, but there are 2 problems I'd hit:
1) On some windows 95 machines there seems to be a bug which causes random values to be returned rather than the network card address. So need to check for them.
2) When a network card is not installed, the OS provides a random "unique" value. There is a return code which on windows9x & NT which identifies this case.

I use:
if(UuidCreate(&guid) == RPC_S_OK // get network card ID number (if there is one)
&& (memcmp(guid.Data4 + 2, "DEST\0\0", 6)))

But, on Windows 2000 Pro, the UuidCreate() does not seem to return the network card, but a random "unique" value. I've not had time to check into this more, anyone else hit this? Anyone know of any other ways of getting the MAC?

Regards,
Charly