/// <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; } } }
/// <summary> /// Construct the question reading from a DNS Server response. Consult RFC1035 4.1.2 /// for byte-wise details of this structure in byte array form /// </summary> /// <param name="pointer">a logical pointer to the Question in byte array form</param> internal Question(Pointer pointer) { // extract from the message _domain = pointer.ReadDomain(); _dnsType = (DnsType)pointer.ReadShort(); _dnsClass = (DnsClass)pointer.ReadShort(); }
/// <summary> /// Constructs an MX record by reading bytes from a return message /// </summary> /// <param name="pointer">A logical pointer to the bytes holding the record</param> internal MXRecord(Pointer pointer) { _preference = pointer.ReadShort(); _domainName = pointer.ReadDomain(); }