C語言獲取本機Mac地址的代碼

C語言獲取本機Mac地址的代碼

//linux
int GetLocalMacAddr(char szMac,int pnMacLen)
{
  int   sock;

  struct   sockaddr_in   sin;

  struct   sockaddr   sa;

  struct   ifreq   ifr;

  unsigned   char   mac[6];

sock=socket(AF_INET,SOCK_DGRAM,0);

  if (sock==-1)

  {

    perror("socket");

    return 1;

  }
strncpy(ifr.ifr_name,"eth0",sizeof(ifr.ifr_name));

  ifr.ifr_name[IFNAMSIZ-1]   =   0;
memset(mac,0,sizeof(mac));

  if (ioctl(sock,SIOCGIFHWADDR,&ifr)< 0)

  {

    perror("ioctl");

    return 2;

  }
memcpy(&sa,&ifr.ifr_addr,sizeof(sin));

  memcpy(mac,sa.sa_data,sizeof(mac));

  char curmacstr[64];
  memset(curmacstr,0,sizeof(curmacstr));
  //sprintf(curmacstr,"%.2X-%.2X-%.2X-%.2X-%.2X-%.2X",mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);
  sprintf(curmacstr,"%.2X:%.2X:%.2X:%.2X:%.2X:%.2X",mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);
  strcpy(szMac,curmacstr);
  return 0;
}
// windows
int CUtil::GetOtherMacAddr(char szIP,char szBuf,int *pnBufLen)
{
    HRESULT hr;
    IPAddr  ipAddr;
    ULONG   pulMac[2];
    ULONG   ulLen;
    char strMacAddr[100]={0};
    ipAddr = inet_addr (szIP);
    memset (pulMac, 0xff, sizeof (pulMac));
    ulLen = 6;
    hr = SendARP (ipAddr, 0, pulMac, &ulLen);
    if(hr!=NO_ERROR)
        return 1;

unsigned char * mac_addr=(unsigned char*)pulMac;
//sprintf(strMacAddr,"%02X-%02X-%02X-%02X-%02X-%02X",mac_addr[0],mac_addr[1],
//    mac_addr[2],mac_addr[3],mac_addr[4],mac_addr[5]);
sprintf(strMacAddr,"%02X:%02X:%02X:%02X:%02X:%02X",mac_addr[0],mac_addr[1],
    mac_addr[2],mac_addr[3],mac_addr[4],mac_addr[5]);
if ( *pnBufLen <= (int)strlen(strMacAddr) )
    return 2;
strcpy(szBuf,strMacAddr);
*pnBufLen = strlen(szBuf);

return 0;

}
int CUtil::GetLocalMacAddr(char szMac,int pnMacLen,char szIP /=NULL */)
{
    //如果指定了IP，則直接按IP獲取MAC
    //否則，需要先獲取本機名稱，再獲取IP，再獲取MAC
    if ( szIP != NULL )
        return GetOtherMacAddr(szIP,szMac,pnMacLen);

char szHostName[256] = {0};
int nRet = gethostname(szHostName,256);
if ( nRet == SOCKET_ERROR )
    return 1;

//獲取本機名稱
struct hostent* hHost = gethostbyname(szHostName);
if ( hHost == NULL ||  hHost->h_addr_list[0] == NULL )
    return 2;

//獲取IP地址
memset(szHostName,0,256);
strcpy(szHostName,inet_ntoa(*(struct in_addr *)hHost->h_addr_list[0]));

//獲取MAC
return  GetOtherMacAddr(szHostName,szMac,pnMacLen);

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