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 .

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]

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

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.

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