获取系统网络MAC地址的三种方法

#include <snmp.h>
#include <conio.h>
#include <stdio.h>

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);

void main()
{
  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};
  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, j = 0;
  bool found = false;
  char TempEthernet[13];
  m_Init = NULL;
  m_InitEx = NULL;
  m_Query = NULL;
  m_Trap = NULL;

  /* 加载SNMP动态链接库并得到所需函数的地址 */
  m_hInst = LoadLibrary("inetmib1.dll");
  if (m_hInst < (HINSTANCE) HINSTANCE_ERROR)
  {
    m_hInst = NULL;
    return;
  }
  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);

  /* 初始化m_Query将传回的变量列表 */
  varBindList.list = varBind;
  varBind[0].name = MIB_NULL;
  varBind[1].name = MIB_NULL;

  /* 拷贝OID以在接口表中查找到表目（适配器）数量 */
  varBindList.len = 1;        /* 仅处理一条记录 */
  SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryNum);
  ret =
    m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
            &errorIndex);
  printf("# of adapters in this system : %in",
       varBind[0].value.asnValue.number);
  varBindList.len = 2;

  /* 拷贝入OID接口类型ifType */
  SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryType);

  /* 拷贝入OID地址ifPhysAddress */
  SNMP_oidcpy(&varBind[1].name, &MIB_ifMACEntAddr);

  do
  {

    /* 提交查询。应答将被填入varBindList。 Submit the query.  Responses will be loaded into varBindList.
       我们可以认为后续调用的执行次数与系统所报告的适配器数目相同。 */
    ret =
      m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
              &errorIndex);
    if (!ret)
      ret = 1;
    else
        /* 确认已经返回正确的类型 */
      ret =
          SNMP_oidncmp(&varBind[0].name, &MIB_ifEntryType,
                       MIB_ifEntryType.idLength); if (!ret) {
    j++;
    dtmp = varBind[0].value.asnValue.number;
    printf("Interface #%i type : %in", j, dtmp);

    /* 类型6标识以太网接口 */
    if (dtmp == 6)
    {

      /* 这里确认我们有了一个地址 */
      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))
        {
          /* 忽略所有的拨号网络适配器 */
          printf("Interface #%i is a DUN adaptern", j);
          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))
        {
          /* 忽略其他网络接口返回的NULL地址 */
          printf("Interface #%i is a NULL addressn", j);
          continue;
        }
        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]);
        printf("MAC Address of interface #%i: %sn", j,
               TempEthernet);}
      }
    }
  } while (!ret);         /* 遇到错误时停止。当我们遍历完所有需被测试的接口后会产生一个错误。 */
  getch();

  FreeLibrary(m_hInst);
  /* 释放邦定 */
  SNMP_FreeVarBind(&varBind[0]);
  SNMP_FreeVarBind(&varBind[1]);
}