/// <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>
protected ResourceRecord(Pointer pointer)
{
// 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)pointer.ReadShort())
{
case DnsType.NS:
this._record = new NSRecord(pointer);
break;
case DnsType.MX:
this._record = new MXRecord(pointer);
break;
case DnsType.ANAME:
this._record = new ANameRecord(pointer);
break;
case DnsType.SOA:
this._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>
public Question(Pointer pointer)
{
// extract from the message
this._domain = pointer.ReadDomain();
this._dnsType = (DnsType)pointer.ReadShort();
this._dnsClass = (DnsClass)pointer.ReadShort();
}
/// <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>
protected ResourceRecord(Pointer pointer)
{
// 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)pointer.ReadShort())
{
case DnsType.NS:
this._record = new NSRecord(pointer);
break;
case DnsType.MX:
this._record = new MXRecord(pointer);
break;
case DnsType.ANAME:
this._record = new ANameRecord(pointer);
break;
case DnsType.SOA:
this._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>
public Question(Pointer pointer)
{
// extract from the message
this._domain = pointer.ReadDomain();
this._dnsType = (DnsType) pointer.ReadShort();
this._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>
public MXRecord(Pointer pointer)
{
this._preference = pointer.ReadShort();
this._domainName = pointer.ReadDomain();
}
/// <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>
public MXRecord(Pointer pointer)
{
this._preference = pointer.ReadShort();
this._domainName = pointer.ReadDomain();
}