/// <summary>
/// Constructs an SOA record by reading bytes from a return message
/// </summary>
/// <param name="pointer">A logical pointer to the bytes holding the record</param>
internal SOARecord(Pointer pointer)
{
// read all fields RFC1035 3.3.13
_PrimaryNameServer = pointer.ReadDomain();
_ResponsibleMailAddress = pointer.ReadDomain();
_Serial = pointer.ReadInt();
_Refresh = pointer.ReadInt();
_Retry = pointer.ReadInt();
_Expire = pointer.ReadInt();
_DefaultTTL = pointer.ReadInt();
}
/// <summary>
/// Construct a resource record from a pointer to a byte array
/// </summary>
/// <param name="pointer">the position in the byte array of the record</param>
internal ResourceRecord(Pointer pointer)
{
// extract the domain, question type, question class and Ttl
_Domain = pointer.ReadDomain();
_DnsType = (DnsType)pointer.ReadShort();
_DnsClass = (DnsClass)pointer.ReadShort();
_TTL = pointer.ReadInt();
// the next short is the record length, we only use it for unrecognised record types
int recordLength = pointer.ReadShort();
// and create the appropriate RDATA record based on the dnsType
switch (_DnsType)
{
case DnsType.NS:
_Record = new NSRecord(pointer);
break;
case DnsType.MX:
_Record = new MXRecord(pointer);
break;
case DnsType.ANAME:
_Record = new ANameRecord(pointer);
break;
case DnsType.SOA:
_Record = new SOARecord(pointer);
break;
default:
// move the pointer over this unrecognised record
pointer += recordLength;
break;
}
}
