Re: Help on retrieving Machine ID

"Sachin Bhave" <sachinbhave@rediffmail.com> wrote in message
news:e3$U2XjiGHA.3408@TK2MSFTNGP05.phx.gbl...


Sachin

Here is a VC++ function to get the MAC Address

Dave Hart

// GetMacAddress.cpp
//

#include "stdafx.h"
#include <Winsock2.h>
#include <snmp.h>
#include <stdio.h>

#pragma comment(lib, "Snmpapi.lib")
#pragma comment(lib, "Ws2_32.lib")

typedef BOOL(WINAPI * pSnmpExtensionInit) (
  IN DWORD dwTimeZeroReference,
  OUT HANDLE * hPollForTrapEvent,
  OUT AsnObjectIdentifier * supportedView);

typedef BOOL(WINAPI * pSnmpExtensionTrap) (
  OUT AsnObjectIdentifier * enterprise,
  OUT AsnInteger * genericTrap,
  OUT AsnInteger * specificTrap,
  OUT AsnTimeticks * timeStamp,
  OUT RFC1157VarBindList * variableBindings);

typedef BOOL(WINAPI * pSnmpExtensionQuery) (
  IN BYTE requestType,
  IN OUT RFC1157VarBindList * variableBindings,
  OUT AsnInteger * errorStatus,
  OUT AsnInteger * errorIndex);

typedef BOOL(WINAPI * pSnmpExtensionInitEx) (
  OUT AsnObjectIdentifier * supportedView);

CString GetMACAddress()
{
 CString address;
 WSADATA WinsockData;

 if (WSAStartup(MAKEWORD(2, 0), &WinsockData) != 0) {
  return address;
 }

 HINSTANCE m_hInst;
 pSnmpExtensionInit m_Init;
 pSnmpExtensionInitEx m_InitEx;
 pSnmpExtensionQuery m_Query;
 pSnmpExtensionTrap m_Trap;
 HANDLE PollForTrapEvent;
 AsnObjectIdentifier SupportedView;
 UINT OID_ifEntryType[] = {
  1, 3, 6, 1, 2, 1, 2, 2, 1, 3
 };
 UINT OID_ifEntryNum[] = {
  1, 3, 6, 1, 2, 1, 2, 1
 };
 UINT OID_ipMACEntAddr[] = {
  1, 3, 6, 1, 2, 1, 2, 2, 1, 6
 }; //, 1 ,6 };
 AsnObjectIdentifier MIB_ifMACEntAddr =
  { sizeof(OID_ipMACEntAddr) / sizeof(UINT), OID_ipMACEntAddr };
 AsnObjectIdentifier MIB_ifEntryType = {
  sizeof(OID_ifEntryType) / sizeof(UINT), OID_ifEntryType
 };
 AsnObjectIdentifier MIB_ifEntryNum = {
  sizeof(OID_ifEntryNum) / sizeof(UINT), OID_ifEntryNum
 };

 RFC1157VarBindList varBindList;
 RFC1157VarBind varBind[2];
 AsnInteger errorStatus;
 AsnInteger errorIndex;
 AsnObjectIdentifier MIB_NULL = {
  0, 0
 };

 int ret;
 int dtmp;
 int i = 0;
 int j = 0;
 BOOL found = FALSE;
 char TempEthernet[13];
 m_Init = NULL;
 m_InitEx = NULL;
 m_Query = NULL;
 m_Trap = NULL;

 // Load the SNMP dll and get the addresses of the functions necessary
 m_hInst = LoadLibrary("inetmib1.dll");
 if (m_hInst < (HINSTANCE) HINSTANCE_ERROR) {
  m_hInst = NULL;
  return address;
 }

 m_Init = (pSnmpExtensionInit) GetProcAddress(m_hInst, "SnmpExtensionInit");
 m_InitEx = (pSnmpExtensionInitEx) GetProcAddress(m_hInst,
"SnmpExtensionInitEx");
 m_Query = (pSnmpExtensionQuery) GetProcAddress(m_hInst,
"SnmpExtensionQuery");
 m_Trap = (pSnmpExtensionTrap) GetProcAddress(m_hInst, "SnmpExtensionTrap");
 m_Init(GetTickCount(), &PollForTrapEvent, &SupportedView);

 // Initialize the variable list to be retrieved by m_Query
 varBindList.list = varBind;
 varBind[0].name = MIB_NULL;
 varBind[1].name = MIB_NULL;

 // Copy in the OID to find the number of entries in the Inteface table
 varBindList.len = 1; // Only retrieving one item
 SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryNum);
 ret = m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex);
 varBindList.len = 2; // Now retrieve two items

 // Copy in the OID of ifType, the type of interface
 SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryType);

 // Copy in the OID of ifPhysAddress, the address
 SNMP_oidcpy(&varBind[1].name, &MIB_ifMACEntAddr);

 do {
  // Submit the query. Responses will be loaded into varBindList.
  // We can expect this call to succeed a # of times corresponding
  // to the # of adapters reported to be in the system
  ret = m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex);
  if (!ret)
   ret = 1;
  else
   // Confirm that the proper type has been returned
   ret = SNMP_oidncmp(&varBind[0].name, &MIB_ifEntryType,
MIB_ifEntryType.idLength);
  if (!ret) {
   j++;
   dtmp = varBind[0].value.asnValue.number;

   // Type 6 describes ethernet interfaces
   if (dtmp == 6) {
    // Confirm that we have an address here
    ret = SNMP_oidncmp(&varBind[1].name, &MIB_ifMACEntAddr,
MIB_ifMACEntAddr.idLength);
    if ((!ret) && (varBind[1].value.asnValue.address.stream != NULL)) {
     if ((varBind[1].value.asnValue.address.stream[0] == 0x44) &&
      (varBind[1].value.asnValue.address.stream[1] == 0x45) &&
      (varBind[1].value.asnValue.address.stream[2] == 0x53) &&
      (varBind[1].value.asnValue.address.stream[3] == 0x54) &&
      (varBind[1].value.asnValue.address.stream[4] == 0x00)) {

      // Ignore all dial-up networking adapters
      continue;
     }
     if ((varBind[1].value.asnValue.address.stream[0] == 0x00) &&
      (varBind[1].value.asnValue.address.stream[1] == 0x00) &&
      (varBind[1].value.asnValue.address.stream[2] == 0x00) &&
      (varBind[1].value.asnValue.address.stream[3] == 0x00) &&
      (varBind[1].value.asnValue.address.stream[4] == 0x00) &&
      (varBind[1].value.asnValue.address.stream[5] == 0x00)) {

      // Ignore NULL addresses returned by other network interfaces
      continue;
     }
     // OK its an ethernet interface
     sprintf(TempEthernet, "%02X-%02X-%02X-%02X-%02X-%02X",
       varBind[1].value.asnValue.address.stream[0],
       varBind[1].value.asnValue.address.stream[1],
       varBind[1].value.asnValue.address.stream[2],
       varBind[1].value.asnValue.address.stream[3],
       varBind[1].value.asnValue.address.stream[4],
       varBind[1].value.asnValue.address.stream[5]);
     address = TempEthernet;
     break; // finish
    }
   }
  }
 } while (!ret);

 // Free the bindings
 SNMP_FreeVarBind(&varBind[0]);
 SNMP_FreeVarBind(&varBind[1]);

 return address;
}