298 lines
11 KiB
C#
298 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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namespace DnDns.Enums
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{
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// DNS HEADER: http://www.faqs.org/rfcs/rfc1035.html
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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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// | Query Identifier |
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// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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// |QR| Opcode |AA|TC|RD|RA| Z|AD|CD| RCODE | <-- The Enums below are combined to create this 16 bit (2 byte) field
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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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/// FlagMasks are used as a bitmask to isolate bits 16 through 31 of the DNS header to convert
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/// them to their appropriate Enum types
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/// </summary>
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internal enum FlagMasks : ushort
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{
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QueryResponseMask = 0x8000,
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OpCodeMask = 0x7800,
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NsFlagMask = 0x07F0,
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RCodeMask = 0x000F
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}
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/// <summary>
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/// |QR| - Starts at bit 16 of DNS Header, size: 1 bit
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///
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/// RFC 1035:
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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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///
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/// </summary>
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[Flags()]
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public enum QueryResponse : ushort
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{
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/// <summary>
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/// // QR Query or Response [RFC1035] ( 0 = Query )
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/// </summary>
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Query = 0x0,
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/// <summary>
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/// // QR Query or Response [RFC1035] ( 1 = Response )
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/// </summary>
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Response = 0x8000
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}
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/// <summary>
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/// | OpCode | - 4 bits of Dns header, Bit 17 - 20, see RFC 1035
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///
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/// RFC 1035:
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///
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/// 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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///
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/// The values are:
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///
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/// 0 a standard query (QUERY)
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///
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/// 1 an inverse query (IQUERY)
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///
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/// 2 a server status request (STATUS)
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///
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/// 3-15 reserved for future
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/// </summary>
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[Flags()]
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public enum OpCode : ushort
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{
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/// <summary>
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/// Standard query
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/// [RFC1035] (QUERY)
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/// </summary>
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QUERY = 0x0000,
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/// <summary>
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/// Inverse query
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/// [RFC1035] (IQUERY)
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/// </summary>
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IQUERY = 0x0800,
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/// <summary>
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/// Server status request
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/// [RFC1035] (STATUS)
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/// </summary>
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STATUS = 0x1000,
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}
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/// <summary>
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/// |AA|TC|RD|RA| Z|AD|CD| - 8 bits (1 byte) flag fields
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///
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/// reference: http://www.networksorcery.com/enp/protocol/dns.htm
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/// </summary>
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[Flags()]
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public enum NsFlags : ushort
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{
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/// <summary>
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/// AA - Authorative Answer [RFC1035] ( 0 = Not authoritative, 1 = Is authoritative )
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/// Authoritative Answer - this bit is valid in responses,
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/// and specifies that the responding name server is an
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/// authority for the domain name in question section.
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///
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/// Note that the contents of the answer section may have
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/// multiple owner names because of aliases. The AA bit
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/// corresponds to the name which matches the query name, or
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/// the first owner name in the answer section.
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/// </summary>
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AA = 0x0400,
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/// <summary>
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/// TC - Truncated Response [RFC1035] ( 0 = Not truncated, 1 = Message truncated )
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///
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/// TrunCation - specifies that this message was truncated
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/// due to length greater than that permitted on the
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/// transmission channel.
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/// </summary>
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TC = 0x0200,
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/// <summary>
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/// RD - Recursion Desired [RFC1035] ( 0 = Recursion not desired, 1 = Recursion desired )
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///
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/// Recursion Desired - this bit may be set in a query and
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/// is copied into the response. If RD is set, it directs
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/// the name server to pursue the query recursively.
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/// Recursive query support is optional.
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/// </summary>
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RD = 0x0100,
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/// <summary>
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/// RA - Recursion Allowed [RFC1035] ( 0 = Recursive query support not available, 1 = Recursive query support available )
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///
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/// Recursion Available - this be is set or cleared in a
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/// response, and denotes whether recursive query support is
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/// available in the name server.
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/// </summary>
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RA = 0x0080,
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/// <summary>
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/// AD - Authentic Data [RFC4035] ( Authenticated data. 1 bit ) [NOT IMPLEMENTED]
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///
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/// Indicates in a response that all data included in the answer and authority
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/// sections of the response have been authenticated by the server according to
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/// the policies of that server. It should be set only if all data in the response
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/// has been cryptographically verified or otherwise meets the server's local security
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/// policy.
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/// </summary>
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AD = 0x0020,
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/// <summary>
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/// CD - Checking Disabled [RFC4035] ( Checking Disabled. 1 bit ) [NOT IMPLEMENTED]
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/// </summary>
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CD = 0x0010
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}
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/// <summary>
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/// | RCODE | - 4 bits error codes
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///
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/// Response code - this 4 bit field is set as part of
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/// responses. The values have the following interpretation:
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///
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/// Fields 6-15 Reserved for future use.
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///
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/// reference: http://www.networksorcery.com/enp/protocol/dns.htm
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/// </summary>
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[Flags()]
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public enum RCode : ushort
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{
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/// <summary>
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/// No error condition
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/// </summary>
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NoError = 0,
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/// <summary>
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/// Format error - The name server was unable to
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/// interpret the query.
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/// </summary>
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FormatError = 1,
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/// <summary>
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/// Server failure - The name server was unable to process
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/// this query due to a problem with the name server.
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/// </summary>
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ServerFailure = 2,
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/// <summary>
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/// Name Error - Meaningful only for responses from an
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/// authoritative name server, this code signifies that
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/// the domain name referenced in the query does not
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/// exist.
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/// </summary>
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NameError = 3,
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/// <summary>
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/// Not Implemented - The name server does not support
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/// the requested kind of query.
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/// </summary>
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NotImplemented = 4,
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/// <summary>
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/// Refused - The name server refuses to perform the
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/// specified operation for policy reasons. For example,
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/// a name server may not wish to provide the information
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/// to the particular requester, or a name server may not
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/// wish to perform a particular operation (e.g., zone
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/// transfer) for particular data.
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/// </summary>
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Refused = 5,
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/// <summary>
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/// RFC 2136
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/// Name Exists when it should not.
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/// </summary>
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YXDomain = 6,
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/// <summary>
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/// RFC 2136
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/// RR Set Exists when it should not.
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/// </summary>
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YXRRSet = 7,
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/// <summary>
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/// RFC 2136
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/// RR Set that should exist does not.
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/// </summary>
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NXRRSet = 8,
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/// <summary>
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/// RFC 2136
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/// Server Not Authoritative for zone.
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/// </summary>
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NotAuth = 9,
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/// <summary>
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/// RFC 2136
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/// Name not contained in zone.
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/// </summary>
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NotZone = 10,
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/// <summary>
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/// RFC 2671
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/// RFC 2845
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///
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/// BADVERS Bad OPT Version.
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/// BADSIG TSIG Signature Failure.
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/// </summary>
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BADVERS_BADSIG = 16,
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/// <summary>
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/// RFC 2845
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/// Key not recognized.
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/// </summary>
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BADKEY = 17,
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/// <summary>
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/// RFC 2845
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/// Signature out of time window.
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/// </summary>
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BADTIME = 18,
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/// <summary>
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/// RFC 2930
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/// Bad TKEY Mode.
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/// </summary>
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BADMODE = 19,
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/// <summary>
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/// RFC 2930
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/// Duplicate key name.
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/// </summary>
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BADNAME = 20,
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/// <summary>
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/// RFC 2930
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/// Algorithm not supported.
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/// </summary>
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BADALG = 21
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}
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}
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