87 lines
1.9 KiB
C#
87 lines
1.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace skyscraper5.DNS.Protocol
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{
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public class Question
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{
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public static IList<Question> GetAllFromArray(byte[] message, int offset, int questionCount)
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{
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return GetAllFromArray(message, offset, questionCount, out offset);
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}
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public static IList<Question> GetAllFromArray(byte[] message, int offset, int questionCount, out int endOffset)
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{
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IList<Question> questions = new List<Question>(questionCount);
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for (int i = 0; i < questionCount; i++)
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{
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try
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{
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questions.Add(FromArray(message, offset, out offset));
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}
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catch (IndexOutOfRangeException ioore)
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{
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endOffset = offset;
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return questions;
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}
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catch (ArgumentException ae)
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{
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endOffset = offset;
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return questions;
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}
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}
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endOffset = offset;
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return questions;
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}
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public static Question FromArray(byte[] message, int offset, out int endOffset)
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{
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Domain domain = Domain.FromArray(message, offset, out offset);
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Tail tail = Marshalling.Struct.GetStruct<Tail>(message, offset, Tail.SIZE);
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endOffset = offset + Tail.SIZE;
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return new Question(domain, tail.Type, tail.Class);
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}
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[Marshalling.Endian(Marshalling.Endianness.Big)]
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[StructLayout(LayoutKind.Sequential, Pack = 2)]
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private struct Tail
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{
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public const int SIZE = 4;
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private ushort type;
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private ushort klass;
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public RecordType Type
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{
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get { return (RecordType)type; }
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set { type = (ushort)value; }
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}
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public RecordClass Class
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{
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get { return (RecordClass)klass; }
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set { klass = (ushort)value; }
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}
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}
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private Domain domain;
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private RecordType type;
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private RecordClass klass;
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public Question(Domain domain, RecordType type = RecordType.A, RecordClass klass = RecordClass.IN)
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{
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this.domain = domain;
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this.type = type;
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this.klass = klass;
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}
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}
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}
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