/// <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;
}
}
}
