/// <summary>
/// Parses Bytes from DNS to IDnsPacket Object
/// </summary>
/// <param name="data"></param>
/// <param name="sendDnsPacket"></param>
/// <returns></returns>
public static IDnsPacket Parse(byte[] data, SendDnsPacket sendDnsPacket)
{
IDnsHeader header = DnsHeader.Parse(data.Take(12).ToArray()); //Take First 12x Bytes which should always equal to DNS header
if (header.Parameters.Response != ResponseCode.Ok) //If other response to OK, then return.
{
return(new ReceiveDnsPacket(header, sendDnsPacket.Questions, null));
}
int byteCount = 12; //Amount of bytes before answer (Start with header)
sendDnsPacket.Questions.ToList().ForEach(n => byteCount += n.ToBytes().Length); //Question Byte Count
byte[] answerArr = data.TakeLast(data.Length - byteCount).ToArray(); //Extracts answers from data
IEnumerable <IResource> answers = Resource.Parse(data, new ReceiveDnsPacket(header, sendDnsPacket.Questions, null));
return(new ReceiveDnsPacket(header, sendDnsPacket.Questions, answers));
}
/// <summary>
/// Construction of a Receive DNS Packet
/// </summary>
/// <param name="header"></param>
/// <param name="questions"></param>
/// <param name="resource"></param>
protected DnsPacket(IDnsHeader header, IEnumerable <IQuestion> questions, IEnumerable <IResource> resource)
{
Header = header;
Questions = questions;
Resources = resource;
}
/// <inheritdoc />
/// <summary>
/// Construction of a Send DNS Packet
/// </summary>
/// <param name="header"></param>
/// <param name="question"></param>
public SendDnsPacket(IDnsHeader header, IQuestion question) : base(header, new [] { question })
{
}
/// <summary>
/// Construction of a Send DNS Packet
/// </summary>
/// <param name="header"></param>
/// <param name="questions"></param>
protected DnsPacket(IDnsHeader header, IEnumerable <IQuestion> questions) : this(header, questions, null)
{
}
public ReceiveDnsPacket(IDnsHeader header, IEnumerable <IQuestion> questions, IEnumerable <IResource> resource) : base(header, questions, resource)
{
}
