internal static DnsEntry Create(Win32.DNS_RECORD record, IntPtr ptr)
{
switch (record.Type)
{
case (ushort)DnsRecordType.A:
case (ushort)DnsRecordType.AAAA:
return(new DnsHostEntry(record, ptr));
case (ushort)DnsRecordType.NS:
case (ushort)DnsRecordType.PTR:
case (ushort)DnsRecordType.CNAME:
return(new DnsPointerEntry(record, ptr));
case (ushort)DnsRecordType.MX:
return(new DnsMailExchangeEntry(record, ptr));
case (ushort)DnsRecordType.SRV:
return(new DnsServiceEntry(record, ptr));
case (ushort)DnsRecordType.TXT:
return(new DnsTextEntry(record, ptr));
default:
throw new NotSupportedException();
}
}
internal DnsMailExchangeEntry(Win32.DNS_RECORD record, IntPtr ptr) : base(record)
{
var data = record.GetData <Win32.DNS_MX_DATA>(ptr);
Exchanger = Marshal.PtrToStringUni(data.NameExchange);
Preference = data.Preference;
}
internal DnsEntry(Win32.DNS_RECORD record)
{
Type = (DnsRecordType)record.Type;
Name = Marshal.PtrToStringUni(record.Name);
TimeToLive = TimeSpan.FromSeconds(record.TimeToLive);
Expires = DateTime.UtcNow.Add(TimeToLive);
}
internal DnsHostEntry(Win32.DNS_RECORD record, IntPtr ptr) : base(record)
{
var data = record.GetData <Win32.DnsHostUnion>(ptr);
Address = (Type == DnsRecordType.A)
? Win32.ConvertUintToIpAddress(data.A.IpAddress)
: Win32.ConvertAAAAToIpAddress(data.AAAA);
}
internal DnsServiceEntry(Win32.DNS_RECORD record, IntPtr ptr) : base(record)
{
var data = record.GetData <Win32.DNS_SRV_DATA>(ptr);
Host = Marshal.PtrToStringUni(data.NameTarget);
Priority = data.Priority;
Weight = data.Weight;
Port = data.Port;
}
internal DnsTextEntry(Win32.DNS_RECORD record, IntPtr ptr) : base(record)
{
// get TXT DATA block
var txt = record.GetData <Win32.DNS_TXT_DATA>(ptr);
// get pointers to strings
var stringPointers = new IntPtr[txt.Count()];
IntPtr pointer0 = ptr + Marshal.SizeOf(record) + Marshal.SizeOf(txt.StringCount);
Marshal.Copy(pointer0, stringPointers, 0, stringPointers.Length);
// get string values
Text = new string[stringPointers.Length];
for (int i = 0; i < stringPointers.Length; i++)
{
Text[i] = Marshal.PtrToStringUni(stringPointers[i]);
}
}
internal DnsPointerEntry(Win32.DNS_RECORD record, IntPtr ptr) : base(record)
{
var data = record.GetData <Win32.DNS_PTR_DATA>(ptr);
Target = Marshal.PtrToStringUni(data.NameHost);
}
