public static DnsResponseMessage Combine(params DnsResponseMessage[] messages)
{
if (messages.Length <= 1)
{
return(messages.FirstOrDefault());
}
var first = messages.First();
var header = new DnsResponseHeader(
first.Header.Id,
(ushort)first.Header.HeaderFlags,
first.Header.QuestionCount,
messages.Sum(p => p.Header.AnswerCount),
messages.Sum(p => p.Header.AdditionalCount),
first.Header.NameServerCount);
var response = new DnsResponseMessage(header, messages.Sum(p => p.MessageSize));
response.Questions.AddRange(first.Questions);
response.Additionals.AddRange(messages.SelectMany(p => p.Additionals));
response.Answers.AddRange(messages.SelectMany(p => p.Answers));
response.Authorities.AddRange(messages.SelectMany(p => p.Authorities));
return(response);
}
public void AuditResponseHeader(DnsResponseHeader header)
{
_auditWriter.AppendLine(";; Got answer:");
_auditWriter.AppendLine(header.ToString());
if (header.RecursionDesired && !header.RecursionAvailable)
{
_auditWriter.AppendLine(";; WARNING: recursion requested but not available");
}
_auditWriter.AppendLine();
}
public DnsResponseMessage(DnsResponseHeader header, int messageSize)
{
if (header == null)
{
throw new ArgumentNullException(nameof(header));
}
Header = header;
MessageSize = messageSize;
}
public DnsResponseMessage GetResponseMessage(ArraySegment <byte> responseData)
{
var reader = new DnsDatagramReader(responseData);
var id = reader.ReadUInt16NetworkOrder();
var flags = reader.ReadUInt16NetworkOrder();
var questionCount = reader.ReadUInt16NetworkOrder();
var answerCount = reader.ReadUInt16NetworkOrder();
var nameServerCount = reader.ReadUInt16NetworkOrder();
var additionalCount = reader.ReadUInt16NetworkOrder();
var header = new DnsResponseHeader(id, flags, questionCount, answerCount, additionalCount, nameServerCount);
var response = new DnsResponseMessage(header, responseData.Count);
for (var questionIndex = 0; questionIndex < questionCount; questionIndex++)
{
var questionQueryString = reader.ReadQuestionQueryString();
var queryTypeValue = reader.ReadUInt16NetworkOrder();
var queryClass = reader.ReadUInt16NetworkOrder();
if (!_queryTypes.TryGetValue(queryTypeValue, out var queryType))
{
queryType = new PseudoResourceRecordType(
abbreviation: "Unknown",
value: queryTypeValue
);
}
var question = new DnsQuestion(questionQueryString, queryType, (QueryClass)queryClass);
response.AddQuestion(question);
}
for (var answerIndex = 0; answerIndex < answerCount; answerIndex++)
{
var info = ReadRecordInfo(reader);
var record = _dnsRecordFactory.GetRecord(info, reader);
response.AddAnswer(record);
}
for (var serverIndex = 0; serverIndex < nameServerCount; serverIndex++)
{
var info = ReadRecordInfo(reader);
var record = _dnsRecordFactory.GetRecord(info, reader);
response.AddAuthority(record);
}
for (var additionalIndex = 0; additionalIndex < additionalCount; additionalIndex++)
{
var info = ReadRecordInfo(reader);
var record = _dnsRecordFactory.GetRecord(info, reader);
response.AddAdditional(record);
}
return(response);
}
public virtual DnsResponseMessage GetResponseMessage(ArraySegment <byte> responseData)
{
var reader = new DnsDatagramReader(responseData);
var factory = new DnsRecordFactory(reader);
var id = reader.ReadUInt16NetworkOrder();
var flags = reader.ReadUInt16NetworkOrder();
var questionCount = reader.ReadUInt16NetworkOrder();
var answerCount = reader.ReadUInt16NetworkOrder();
var nameServerCount = reader.ReadUInt16NetworkOrder();
var additionalCount = reader.ReadUInt16NetworkOrder();
var header = new DnsResponseHeader(id, flags, questionCount, answerCount, additionalCount, nameServerCount);
var response = new DnsResponseMessage(header, responseData.Count);
for (int questionIndex = 0; questionIndex < questionCount; questionIndex++)
{
var question = new DnsQuestion(reader.ReadQuestionQueryString(), (QueryType)reader.ReadUInt16NetworkOrder(), (QueryClass)reader.ReadUInt16NetworkOrder());
response.AddQuestion(question);
}
for (int answerIndex = 0; answerIndex < answerCount; answerIndex++)
{
var info = factory.ReadRecordInfo();
var record = factory.GetRecord(info);
response.AddAnswer(record);
}
for (int serverIndex = 0; serverIndex < nameServerCount; serverIndex++)
{
var info = factory.ReadRecordInfo();
var record = factory.GetRecord(info);
response.AddAuthority(record);
}
for (int additionalIndex = 0; additionalIndex < additionalCount; additionalIndex++)
{
var info = factory.ReadRecordInfo();
var record = factory.GetRecord(info);
response.AddAdditional(record);
}
return(response);
}
