2 // Mono.Net.Dns.DnsQuery
5 // Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
7 // Copyright 2011 Gonzalo Paniagua Javier
9 // Licensed under the Apache License, Version 2.0 (the "License");
10 // you may not use this file except in compliance with the License.
11 // You may obtain a copy of the License at
13 // http://www.apache.org/licenses/LICENSE-2.0
15 // Unless required by applicable law or agreed to in writing, software
16 // distributed under the License is distributed on an "AS IS" BASIS,
17 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 // See the License for the specific language governing permissions and
19 // limitations under the License.
22 using System.Collections.Generic;
26 namespace Mono.Net.Dns {
27 class DnsQuery : DnsPacket {
28 public DnsQuery (string name, DnsQType qtype, DnsQClass qclass)
30 if (String.IsNullOrEmpty (name))
31 throw new ArgumentNullException ("name");
33 int length = DnsUtil.GetEncodedLength (name);
35 throw new ArgumentException ("Invalid DNS name", "name");
37 length += 12 + 2 + 2; // Header + qtype + qclass
38 packet = new byte [length];
39 header = new DnsHeader (packet, 0);
42 WriteUInt16 ((ushort) qtype);
43 WriteUInt16 ((ushort) qclass);
44 Header.QuestionCount = 1;
45 Header.IsQuery = true;
46 Header.RecursionDesired = true;