ResourceRecord.cs

using System.IO;
using Waher.Networking.DNS.Communication;
using Waher.Networking.DNS.Enumerations;
using Waher.Persistence.Attributes;
 
namespace Waher.Networking.DNS.ResourceRecords
{
    [TypeName(TypeNameSerialization.LocalName)]
    public abstract class ResourceRecord
    {
        private string name;
        private TYPE type;
        private CLASS _class;
        private uint ttl;
 
        public ResourceRecord()
        {
            this.name = string.Empty;
            this.type = TYPE.A;
            this._class = CLASS.IN;
            this.ttl = 0;
        }
 
        public ResourceRecord(string Name, TYPE Type, CLASS Class, uint Ttl)
        {
            this.name = Name;
            this.type = Type;
            this._class = Class;
            this.ttl = Ttl;
        }
 
        [DefaultValueStringEmpty]
        public string Name
        {
            get => this.name;
            set => this.name = value;
        }
 
        [DefaultValue(TYPE.A)]
        public TYPE Type
        {
            get => this.type;
            set => this.type = value;
        }
 
        [DefaultValue(CLASS.IN)]
        public CLASS Class
        {
            get => this._class;
            set => this._class = value;
        }
 
        [DefaultValue(0)]
        public uint Ttl
        {
            get => this.ttl;
            set => this.ttl = value;
        }
 
        internal static ResourceRecord Create(Stream Data)
        {
            string NAME = DnsClient.ReadName(Data);
            TYPE TYPE = (TYPE)DnsClient.ReadUInt16(Data);
            CLASS CLASS = (CLASS)DnsClient.ReadUInt16(Data);
            uint TTL = DnsClient.ReadUInt32(Data);
            ushort RDLENGTH = DnsClient.ReadUInt16(Data);
            long EndPos = Data.Position + RDLENGTH;
            ResourceRecord Response;
 
            switch (TYPE)
            {
                case TYPE.A: Response = new A(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.NS: Response = new NS(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MD: Response = new MD(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MF: Response = new MF(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.CNAME: Response = new CNAME(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.SOA: Response = new SOA(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MB: Response = new MB(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MG: Response = new MG(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MR: Response = new MR(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.NULL: Response = new NULL(NAME, TYPE, CLASS, TTL, Data, EndPos); break;
                case TYPE.WKS: Response = new WKS(NAME, TYPE, CLASS, TTL, Data, EndPos); break;
                case TYPE.PTR: Response = new PTR(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.HINFO: Response = new HINFO(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MINFO: Response = new MINFO(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.MX: Response = new MX(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.TXT: Response = new TXT(NAME, TYPE, CLASS, TTL, Data, EndPos); break;
                case TYPE.AAAA: Response = new AAAA(NAME, TYPE, CLASS, TTL, Data); break;
                case TYPE.SRV: Response = new SRV(NAME, TYPE, CLASS, TTL, Data); break;
 
                default:
                    Response = null;    // Unrecognized Resource Record.
                    break;
            }
 
            Data.Position = EndPos;
 
            return Response;
        }
 
        public override string ToString()
        {
            return this.name + "\t" + this.type.ToString() + "\t" + this._class.ToString() +
                "\t" + this.ttl.ToString();
        }
 
    }
}