/// <summary>
/// Create from an array
/// </summary>
/// <param name="data">The data</param>
/// <returns>The parsed DNS packet</returns>
public static DNSPacket FromArray(byte[] data)
{
DataReader reader = new DataReader(new MemoryStream(data));
DNSPacket ret = new DNSPacket();
ret.Id = reader.ReadUInt16(false);
ushort flags = reader.ReadUInt16(false);
ret.Query = GetBooleanFlag(flags, 0);
ret.Opcode = (DNSOpcode)GetFlagValue(flags, 1);
ret.AuthoritiveAnswer = GetBooleanFlag(flags, 5);
ret.Truncation = GetBooleanFlag(flags, 6);
ret.RecursionDesired = GetBooleanFlag(flags, 7);
ret.RecursionAvailable = GetBooleanFlag(flags, 8);
ret.ResponseCode = (DNSRCode)GetFlagValue(flags, 12);
ushort qdcount = reader.ReadUInt16(false);
ushort ancount = reader.ReadUInt16(false);
ushort nscount = reader.ReadUInt16(false);
ushort arcount = reader.ReadUInt16(false);
if (qdcount > 0)
{
DNSQuestion[] questions = new DNSQuestion[qdcount];
for (int i = 0; i < qdcount; i++)
{
questions[i] = ReadQuestion(data, reader);
}
ret.Questions = questions;
}
if (ancount > 0)
{
ret.Answers = ReadResourceRecords(data, reader, ancount);
}
if (nscount > 0)
{
ret.NameServers = ReadResourceRecords(data, reader, nscount);
}
if (arcount > 0)
{
ret.Additional = ReadResourceRecords(data, reader, arcount);
}
return(ret);
}
/// <summary>
/// Write record to write
/// </summary>
/// <param name="writer">The writer</param>
/// <param name="stringCache">String cache</param>
public void ToWriter(DataWriter writer, Dictionary <string, int> stringCache)
{
DNSPacket.WriteString(Name, writer, stringCache);
writer.WriteUInt16((ushort)Type, false);
writer.WriteUInt16((ushort)Class, false);
writer.WriteUInt32(TimeToLive, false);
long currPos = writer.GetStream().Position;
writer.WriteUInt16(0, false);
WriteData(writer, stringCache);
long endPos = writer.GetStream().Position;
writer.GetStream().Position = currPos;
if ((endPos - currPos - 2) > (long)ushort.MaxValue)
{
throw new ArgumentException(String.Format("RR data cannot be longer than {0}", ushort.MaxValue));
}
writer.WriteUInt16((ushort)(endPos - currPos - 2), false);
writer.GetStream().Position = endPos;
}
/// <summary>
/// Create from an array
/// </summary>
/// <param name="data">The data</param>
/// <returns>The parsed DNS packet</returns>
public static DNSPacket FromArray(byte[] data)
{
DataReader reader = new DataReader(new MemoryStream(data));
DNSPacket ret = new DNSPacket();
ret.Id = reader.ReadUInt16(false);
ushort flags = reader.ReadUInt16(false);
ret.Query = GetBooleanFlag(flags, 0);
ret.Opcode = (DNSOpcode)GetFlagValue(flags, 1);
ret.AuthoritiveAnswer = GetBooleanFlag(flags, 5);
ret.Truncation = GetBooleanFlag(flags, 6);
ret.RecursionDesired = GetBooleanFlag(flags, 7);
ret.RecursionAvailable = GetBooleanFlag(flags, 8);
ret.ResponseCode = (DNSRCode)GetFlagValue(flags, 12);
ushort qdcount = reader.ReadUInt16(false);
ushort ancount = reader.ReadUInt16(false);
ushort nscount = reader.ReadUInt16(false);
ushort arcount = reader.ReadUInt16(false);
if (qdcount > 0)
{
DNSQuestion[] questions = new DNSQuestion[qdcount];
for (int i = 0; i < qdcount; i++)
{
questions[i] = ReadQuestion(data, reader);
}
ret.Questions = questions;
}
if (ancount > 0)
{
ret.Answers = ReadResourceRecords(data, reader, ancount);
}
if (nscount > 0)
{
ret.NameServers = ReadResourceRecords(data, reader, nscount);
}
if (arcount > 0)
{
ret.Additional = ReadResourceRecords(data, reader, arcount);
}
return ret;
}
