DomainSearchOption: added support for option 119.

DnsServerCore/Dhcp/Options/DomainSearchOption.cs

@@ -0,0 +1,80 @@
+/*
+Technitium DNS Server
+Copyright (C) 2022  Shreyas Zare (shreyas@technitium.com)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+using System.Collections.Generic;
+using System.IO;
+using TechnitiumLibrary.Net.Dns;
+
+namespace DnsServerCore.Dhcp.Options
+{
+    class DomainSearchOption : DhcpOption
+    {
+        #region variables
+
+        IReadOnlyCollection<string> _searchStrings;
+
+        #endregion
+
+        #region constructor
+
+        public DomainSearchOption(IReadOnlyCollection<string> searchStrings)
+            : base(DhcpOptionCode.DomainSearch)
+        {
+            _searchStrings = searchStrings;
+        }
+
+        public DomainSearchOption(Stream s)
+            : base(DhcpOptionCode.DomainSearch, s)
+        { }
+
+        #endregion
+
+        #region protected
+
+        protected override void ParseOptionValue(Stream s)
+        {
+            if (s.Length < 1)
+                throw new InvalidDataException();
+
+            List<string> searchStrings = new List<string>();
+
+            while (s.Length > 0)
+                searchStrings.Add(DnsDatagram.DeserializeDomainName(s));
+
+            _searchStrings = searchStrings;
+        }
+
+        protected override void WriteOptionValue(Stream s)
+        {
+            List<DnsDomainOffset> domainEntries = new List<DnsDomainOffset>(1);
+
+            foreach (string searchString in _searchStrings)
+                DnsDatagram.SerializeDomainName(searchString, s, domainEntries);
+        }
+
+        #endregion
+
+        #region properties
+
+        public IReadOnlyCollection<string> SearchStrings
+        { get { return _searchStrings; } }
+
+        #endregion
+    }
+}