1 // 2 // Mono.Net.Dns.DnsQuery 3 // 4 // Authors: 5 // Gonzalo Paniagua Javier (gonzalo.mono@gmail.com) 6 // 7 // Copyright 2011 Gonzalo Paniagua Javier 8 // 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 12 // 13 // http://www.apache.org/licenses/LICENSE-2.0 14 // 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. 20 // 21 using System; 22 using System.Collections.Generic; 23 using System.IO; 24 using System.Text; 25 26 namespace Mono.Net.Dns { 27 class DnsQuery : DnsPacket { DnsQuery(string name, DnsQType qtype, DnsQClass qclass)28 public DnsQuery (string name, DnsQType qtype, DnsQClass qclass) 29 { 30 if (String.IsNullOrEmpty (name)) 31 throw new ArgumentNullException ("name"); 32 33 int length = DnsUtil.GetEncodedLength (name); 34 if (length == -1) 35 throw new ArgumentException ("Invalid DNS name", "name"); 36 37 length += 12 + 2 + 2; // Header + qtype + qclass 38 packet = new byte [length]; 39 header = new DnsHeader (packet, 0); 40 position = 12; 41 WriteDnsName (name); 42 WriteUInt16 ((ushort) qtype); 43 WriteUInt16 ((ushort) qclass); 44 Header.QuestionCount = 1; 45 Header.IsQuery = true; 46 Header.RecursionDesired = true; 47 } 48 } 49 } 50 51