Windows 根据IP地址获得MAC地址

getMACByIPWindows.c

/*
 * For Windows Only
 * Find the network interface whose IP address is "ipstr", return the MAC address of this interface in output parameter (macstr), 
 * and the interface name (ifname)
 *
 * Input parameters:
 * ----ipstr: IP address
 * ----ipsize: the buffer size of ipstr
 *
 * Output parameters:
 * ----macstr: MAC address
 * ----macsize: the buffer size of macstr
 * ----ifname: interface name
 * ----ifnsize: the buffer size of ifname
 *
 * Return value:
 * ----  0 => Get MAC address Succeessfully
 * ---- -1 => Fail to get MAC address  
 */
static int
getMACByIPWindows(char *macstr, int macsize, char *ifname, int ifnsize, const char *ipstr, int ipsize)
{
    static char fname[] = "getMACByIPWindows()";
    int rc = -1;

    PIP_ADAPTER_INFO pAdapterInfo;
    PIP_ADAPTER_INFO pAdapter = NULL;
    DWORD dwRetVal = 0;

    char buffer[32];
    memset(buffer, 0, sizeof(buffer));

    ULONG ulOutBufLen = sizeof(IP_ADAPTER_INFO);
    pAdapterInfo = (IP_ADAPTER_INFO *)HeapAlloc(GetProcessHeap(), 0, (sizeof(IP_ADAPTER_INFO)));
    if (pAdapterInfo == NULL) {
        ls_syslog(LOG_ERR,"%s: Error allocating memory needed to call GetAdaptersinfo", fname);
        return -1;
    }

    if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
        HeapFree(GetProcessHeap(), 0, (pAdapterInfo));
        pAdapterInfo = (IP_ADAPTER_INFO *)HeapAlloc(GetProcessHeap(), 0, (ulOutBufLen));
        if (pAdapterInfo == NULL) {
            ls_syslog(LOG_ERR,"%s: Error allocating memory needed to call GetAdaptersinfo", fname);
            return -1;
        }
    }

    if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR) {
        pAdapter = pAdapterInfo;
        while (pAdapter) {

            if ( 0 == strncmp(pAdapter->IpAddressList.IpAddress.String, ipstr, ipsize)) {
                if ( MAC_ADDRESS_LENGTH == pAdapter->AddressLength) {
                    sprintf(macstr, "%02x:%02x:%02x:%02x:%02x:%02x", 
                        pAdapter->Address[0],
                        pAdapter->Address[1],
                        pAdapter->Address[2],
                        pAdapter->Address[3],
                        pAdapter->Address[4],
                        pAdapter->Address[5]
                        );
                    strncpy(ifname, pAdapter->Description, ifnsize-1);
                    rc = 0; //succeed!
                }
            }

            pAdapter = pAdapter->Next;
        }
    } else {
        ls_syslog(LOG_ERR,"%s: GetAdaptersInfo failed with error: %d", fname, dwRetVal);
        return -1;
    }

    return rc;
}