288 lines
11 KiB
C#
288 lines
11 KiB
C#
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/**********************************************************************
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* Copyright (c) 2010, j. montgomery *
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* All rights reserved. *
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* *
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* Redistribution and use in source and binary forms, with or without *
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* modification, are permitted provided that the following conditions *
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* are met: *
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* *
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* + Redistributions of source code must retain the above copyright *
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* notice, this list of conditions and the following disclaimer. *
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* *
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* + Redistributions in binary form must reproduce the above copyright*
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* notice, this list of conditions and the following disclaimer *
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* in the documentation and/or other materials provided with the *
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* distribution. *
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* *
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* + Neither the name of j. montgomery's employer nor the names of *
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* its contributors may be used to endorse or promote products *
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* derived from this software without specific prior written *
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* permission. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS*
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS *
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE *
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,*
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES *
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR *
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) *
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,*
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) *
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED*
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* OF THE POSSIBILITY OF SUCH DAMAGE. *
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**********************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using DnDns.Enums;
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using DnDns.Records;
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namespace DnDns.Query
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{
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/// <summary>
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/// DnsQueryBase maintains the common state of DNS Queries (both responses and requests)
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/// </summary>
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public abstract class DnsQueryBase
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{
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#region Fields
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// RFC 1034
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//
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// 4.1.1. Header section format
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//
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// 1 1 1 1 1 1
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | ID |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// |QR| Opcode |AA|TC|RD|RA| Z | RCODE |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | QDCOUNT |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | ANCOUNT |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | NSCOUNT |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | ARCOUNT |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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/// <summary>
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/// ID - A 16 bit identifier. This identifier is copied
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/// the corresponding reply and can be used by the requester
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/// to match up replies to outstanding queries.
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/// </summary>
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protected ushort _transactionId;
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/// <summary>
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/// _flags will store a combination of the enums that make up the 16 bits after the
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/// TransactionID in the DNS protocol header
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/// </summary>
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protected ushort _flags;
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/// <summary>
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/// A one bit field that specifies whether this message is a
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/// query (0), or a response (1).
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/// </summary>
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protected QueryResponse _queryResponse;
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/// <summary>
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/// OPCODE - A four bit field that specifies kind of query in this
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/// message. This value is set by the originator of a query
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/// and copied into the response.
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/// </summary>
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protected OpCode _opCode;
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/// <summary>
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/// - A combination of flag fields in the DNS header (|AA|TC|RD|RA|)
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/// </summary>
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protected NsFlags _nsFlags;
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/// <summary>
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/// Response code - this 4 bit field is set as part of
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/// responses only.
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/// </summary>
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protected RCode _rCode;
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/// <summary>
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/// QDCOUNT - an unsigned 16 bit integer specifying the number of
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/// entries in the question section.
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/// </summary>
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protected ushort _questions;
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/// <summary>
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/// ANCOUNT - an unsigned 16 bit integer specifying the number of
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/// resource records in the answer section.
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/// </summary>
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protected ushort _answerRRs;
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/// <summary>
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/// NSCOUNT - an unsigned 16 bit integer specifying the number of name
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/// server resource records in the authority records
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/// section.
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/// </summary>
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protected ushort _authorityRRs;
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// RFC 1034
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// 4.1.2. Question section format
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// 1 1 1 1 1 1
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | |
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// / QNAME /
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// / /
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | QTYPE |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// | QCLASS |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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/// <summary>
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/// QNAME - a domain name represented as a sequence of labels, where
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/// each label consists of a length octet followed by that
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/// number of octets. The domain name terminates with the
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/// zero length octet for the null label of the root. Note
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/// that this field may be an odd number of octets; no
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/// padding is used
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/// </summary>
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protected string _name;
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/// <summary>
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/// QTYPE - a two octet code which specifies the type of the query.
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/// The values for this field include all codes valid for a
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/// TYPE field, together with some more general codes which
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/// can match more than one type of RR.
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/// </summary>
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protected NsType _nsType;
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/// <summary>
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/// QCLASS - a two octet code that specifies the class of the query.
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/// For example, the QCLASS field is IN for the Internet.
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/// </summary>
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protected NsClass _nsClass;
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/// <summary>
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/// The additional records for the DNS Query
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/// </summary>
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protected List<IDnsRecord> _additionalRecords = new List<IDnsRecord>();
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#endregion Fields
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#region Properties
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/// ID - A 16 bit identifier. This identifier is copied
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/// the corresponding reply and can be used by the requester
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/// to match up replies to outstanding queries.
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/// </summary>
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public ushort TransactionID
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{
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get { return _transactionId; }
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}
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/// <summary>
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/// A one bit field that specifies whether this message is a
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/// query (0), or a response (1).
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/// </summary>
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public QueryResponse QueryResponse
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{
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get { return _queryResponse; }
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}
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/// <summary>
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/// OPCODE - A four bit field that specifies kind of query in this
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/// message. This value is set by the originator of a query
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/// and copied into the response.
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/// </summary>
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public OpCode OpCode
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{
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get { return _opCode; }
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}
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/// <summary>
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/// NsFlags - A combination of flag fields in the DNS header (|AA|TC|RD|RA|)
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/// </summary>
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public NsFlags NsFlags
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{
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get { return _nsFlags; }
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}
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/// <summary>
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/// Response code - this 4 bit field is set as part of
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/// responses only.
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/// </summary>
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public RCode RCode
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{
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get { return _rCode; }
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}
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/// <summary>
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/// QDCOUNT - an unsigned 16 bit integer specifying the number of
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/// entries in the question section.
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/// </summary>
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public ushort Questions
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{
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get { return _questions; }
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}
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/// <summary>
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/// ANCOUNT - an unsigned 16 bit integer specifying the number of
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/// resource records in the answer section.
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/// </summary>
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public ushort AnswerRRs
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{
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get { return _answerRRs; }
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}
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/// <summary>
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/// NSCOUNT - an unsigned 16 bit integer specifying the number of name
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/// server resource records in the authority records
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/// section.
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/// </summary>
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public ushort AuthorityRRs
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{
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get { return _authorityRRs; }
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}
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/// <summary>
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/// ARCOUNT - an unsigned 16 bit integer specifying the number of
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/// resource records in the additional records section.
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/// </summary>
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public ushort AdditionalRRs
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{
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get { return (ushort) _additionalRecords.Count; }
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}
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/// <summary>
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/// QNAME - a domain name represented as a sequence of labels, where
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/// each label consists of a length octet followed by that
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/// number of octets. The domain name terminates with the
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/// zero length octet for the null label of the root. Note
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/// that this field may be an odd number of octets; no
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/// padding is used
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/// </summary>
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public string Name
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{
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get { return _name; }
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set { _name = value; }
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}
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/// <summary>
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/// QTYPE - a two octet code which specifies the type of the query.
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/// The values for this field include all codes valid for a
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/// TYPE field, together with some more general codes which
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/// can match more than one type of RR.
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/// </summary>
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public NsType NsType
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{
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get { return _nsType; }
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set { _nsType = value; }
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}
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/// <summary>
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/// QCLASS - a two octet code that specifies the class of the query.
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/// For example, the QCLASS field is IN for the Internet.
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/// </summary>
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public NsClass NsClass
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{
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get { return _nsClass; }
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set { _nsClass = value; }
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}
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public List<IDnsRecord> AdditionalRRecords
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{
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get { return _additionalRecords; }
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}
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#endregion
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}
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}
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