/// <summary>
/// Mark the DNSRecord as Offline.
/// </summary>
public void SetOffline()
{
IPAddress address = IPAddress.Parse("0.0.0.0");
IPRecord record = new IPRecord
{
IP = address,
IPStatus = "OFFLINE"
};
List <IPRecord> records = new List <IPRecord>
{
record
};
this.IPRecords = records;
this.DNSStatus = "OFFLINE";
}
/// <summary>
/// Preform DNS Query to gather IPV4 IP's.
/// </summary>
/// <param name="capsule"></param>
public static void Execute(IKLog klog, ref Capsule capsule)
{
try
{
// for each DNS Record
foreach (var article in capsule.DNSRecords)
{
try
{
var count = 0;
List <IPRecord> ipRecordQuickList = new List <IPRecord>();
List <IPRecord> ipRecordTransferList = new List <IPRecord>();
// DNS query multiple times
while (count < 3)
{
var ips = Dns.GetHostAddresses(article.DNSName);
klog.Metric($"ipcount-{article.DNSName}", ips.Length);
// DNS query may return more than one ip
foreach (var ip in ips)
{
IPRecord record = new IPRecord();
record.IP = ip;
record.IPStatus = "ONLINE";
ipRecordQuickList.Add(record);
}
Thread.Sleep(5);
count++;
}
var ipRecordDistinctList = ipRecordQuickList.GroupBy(ip => ip.IP).Select(y => y.First());
foreach (var ipRecord in ipRecordDistinctList)
{
var hitCount = ipRecordQuickList.Select(x => x.IP == ipRecord.IP).Count();
ipRecordTransferList.Add(ipRecord);
}
article.IPRecords = ipRecordTransferList;
article.DNSStatus = "ONLINE";
}
catch (Exception ex)
{
if (ex.ToString().Contains("No such host is known"))
{
klog.Error($"Exception: Unknow Host. {article.DNSName}");
}
else
{
klog.Error($"Exception: {ex}");
}
article.SetOffline();
}
}
}
catch (Exception e)
{
klog.Error($"GetIPAddress - Exception: {e}");
}
}