public static Response FromArray(byte[] message)
{
Header header = Header.FromArray(message);
int offset = header.Size;
if (!header.Response || header.QuestionCount == 0)
{
throw new ArgumentException("Invalid response message");
}
if (header.Truncated)
{
return(new Response(header,
Question.GetAllFromArray(message, offset, header.QuestionCount),
new List <IResourceRecord>(),
new List <IResourceRecord>(),
new List <IResourceRecord>()));
}
return(new Response(header,
Question.GetAllFromArray(message, offset, header.QuestionCount, out offset),
ResourceRecordFactory.GetAllFromArray(message, offset, header.AnswerRecordCount, out offset),
ResourceRecordFactory.GetAllFromArray(message, offset, header.AuthorityRecordCount, out offset),
ResourceRecordFactory.GetAllFromArray(message, offset, header.AdditionalRecordCount, out offset)));
}
/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out DNSReply packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return(false);
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
var messageBytes = br.ReadBytes(count);
var header = Header.FromArray(messageBytes);
int offset = header.Size;
if (!header.Response || header.QuestionCount == 0)
{
packet = null;
return(false);
}
if (header.Truncated)
{
packet = new DNSReply(header,
Question.GetAllFromArray(messageBytes, offset, header.QuestionCount),
new List <IResourceRecord>(),
new List <IResourceRecord>(),
new List <IResourceRecord>());
}
else
{
packet = new DNSReply(header,
Question.GetAllFromArray(messageBytes, offset, header.QuestionCount, out offset),
ResourceRecordFactory.GetAllFromArray(messageBytes, offset, header.AnswerRecordCount, out offset),
ResourceRecordFactory.GetAllFromArray(messageBytes, offset, header.AuthorityRecordCount, out offset),
ResourceRecordFactory.GetAllFromArray(messageBytes, offset, header.AdditionalRecordCount, out offset));
}
return(true);
}
}
}
catch (Exception)
{
packet = null;
return(false);
}
}
public static DnsRequestMessage FromArray(byte[] message)
{
Header header = Header.FromArray(message);
int offset = header.Size;
if (header.Response || header.QuestionCount == 0 ||
header.AnswerRecordCount + header.AuthorityRecordCount > 0 ||
header.ResponseCode != ResponseCode.NoError)
{
throw new ArgumentException("Invalid request message");
}
return(new DnsRequestMessage(header,
Question.GetAllFromArray(message, offset, header.QuestionCount, out offset),
ResourceRecordFactory.GetAllFromArray(message, offset, header.AdditionalRecordCount, out offset)));
}