/// <summary>
/// Initializes a new instance of the <see cref="DnsQueryResult"/> class.
/// </summary>
/// <param name="response">The response.</param>
internal DnsQueryResult(DnsClient.IDnsResponse response)
: this()
{
Id = response.Id;
IsAuthoritativeServer = response.IsAuthorativeServer;
IsRecursionAvailable = response.IsRecursionAvailable;
IsTruncated = response.IsTruncated;
OperationCode = response.OperationCode;
ResponseCode = response.ResponseCode;
if (response.AnswerRecords != null)
{
foreach (var record in response.AnswerRecords)
{
AnswerRecords.Add(new DnsRecord(record));
}
}
if (response.AuthorityRecords != null)
{
foreach (var record in response.AuthorityRecords)
{
AuthorityRecords.Add(new DnsRecord(record));
}
}
if (response.AdditionalRecords != null)
{
foreach (var record in response.AdditionalRecords)
{
AdditionalRecords.Add(new DnsRecord(record));
}
}
}
protected override void FinishParsing()
{
Prequisites =
AnswerRecords.ConvertAll <PrequisiteBase>(
record =>
{
if ((record.RecordClass == RecordClass.Any) && (record.RecordDataLength == 0))
{
return(new RecordExistsPrequisite(record.Name, record.RecordType));
}
else if (record.RecordClass == RecordClass.Any)
{
return(new RecordExistsPrequisite(record));
}
else if ((record.RecordClass == RecordClass.None) && (record.RecordDataLength == 0))
{
return(new RecordNotExistsPrequisite(record.Name, record.RecordType));
}
else if ((record.RecordClass == RecordClass.Any) && (record.RecordType == RecordType.Any))
{
return(new NameIsInUsePrequisite(record.Name));
}
else if ((record.RecordClass == RecordClass.None) && (record.RecordType == RecordType.Any))
{
return(new NameIsNotInUsePrequisite(record.Name));
}
else
{
return(null);
}
}).Where(prequisite => (prequisite != null)).ToList();
Updates =
AuthorityRecords.ConvertAll <UpdateBase>(
record =>
{
if (record.TimeToLive != 0)
{
return(new AddRecordUpdate(record));
}
else if ((record.RecordType == RecordType.Any) && (record.RecordClass == RecordClass.Any) && (record.RecordDataLength == 0))
{
return(new DeleteAllRecordsUpdate(record.Name));
}
else if ((record.RecordClass == RecordClass.Any) && (record.RecordDataLength == 0))
{
return(new DeleteRecordUpdate(record.Name, record.RecordType));
}
else if (record.RecordClass == RecordClass.None)
{
return(new DeleteRecordUpdate(record));
}
else
{
return(null);
}
}).Where(update => (update != null)).ToList();
}
/// <inheritdoc />
public override IWireSerialiser Read(WireReader reader)
{
Id = reader.ReadUInt16();
var flags = reader.ReadUInt16();
QR = (flags & 0x8000) == 0x8000;
AA = (flags & 0x0400) == 0x0400;
TC = (flags & 0x0200) == 0x0200;
RD = (flags & 0x0100) == 0x0100;
RA = (flags & 0x0080) == 0x0080;
opcode4 = (byte)((flags & 0x7800) >> 11);
Z = (flags & 0x0040) >> 6;
AD = (flags & 0x0020) == 0x0020;
CD = (flags & 0x0010) == 0x0010;
Status = (MessageStatus)(flags & 0x000F);
var qdcount = reader.ReadUInt16();
var ancount = reader.ReadUInt16();
var nscount = reader.ReadUInt16();
var arcount = reader.ReadUInt16();
for (var i = 0; i < qdcount; ++i)
{
var question = (Question) new Question().Read(reader);
Questions.Add(question);
}
for (var i = 0; i < ancount; ++i)
{
var rr = (ResourceRecord) new ResourceRecord().Read(reader);
Answers.Add(rr);
}
for (var i = 0; i < nscount; ++i)
{
var rr = (ResourceRecord) new ResourceRecord().Read(reader);
AuthorityRecords.Add(rr);
}
for (var i = 0; i < arcount; ++i)
{
var rr = (ResourceRecord) new ResourceRecord().Read(reader);
AdditionalRecords.Add(rr);
}
return(this);
}
/// <summary>
/// Make the message not exceed the specified length.
/// </summary>
/// <param name="length">
/// The maximum number bytes for the message.
/// </param>
/// <remarks>
/// If the message does not fit into <paramref name="length"/> bytes, then <see cref="AdditionalRecords"/>
/// are removed and then <see cref="AuthorityRecords"/> are removed.
/// <para>
/// If it is still too big, then the <see cref="TC"/> bit is set.
/// </para>
/// </remarks>
public void Truncate(int length)
{
while (Length() > length)
{
// Remove records.
if (AdditionalRecords.Count > 0)
{
AdditionalRecords.RemoveAt(AdditionalRecords.Count - 1);
}
else if (AuthorityRecords.Count > 0)
{
AuthorityRecords.RemoveAt(AuthorityRecords.Count - 1);
}
else
{
// Nothing more can be done to reduce the message length.
TC = true;
return;
}
}
}
