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DNS.NET Resolver (C#)

, 11 Mar 2013
A full implementation of a reusable DNS resolver component and a Dig.Net example application.
Article_Demo.zip
Article_Demo
DnsDig.exe
nunit.framework.dll
article_src-noexe.zip
DnsDig
DnsDig.suo
DnsDig
bin
Debug
Article_Demo.zip
DnsDig.vshost.exe.manifest
Dns
Records
NotUsed
Obsolete
Root
DnsDig.csproj.user
Doc
obj
Debug
DnsDig.AboutForm.resources
DnsDig.MainForm.resources
DnsDig.Properties.Resources.resources
Properties
Settings.settings
article_src.zip
DnsDig.suo
Article_Demo.zip
DnsDig.exe
DnsDig.vshost.exe
DnsDig.vshost.exe.manifest
nunit.framework.dll
DnsDig.csproj.user
DnsDig.AboutForm.resources
DnsDig.exe
DnsDig.MainForm.resources
DnsDig.Properties.Resources.resources
TempPE
Properties.Resources.Designer.cs.dll
Settings.settings
article_src.zip.zip
DnsDig.suo
DnsDig.csproj.user
DnsExperiment.AboutForm.resources
DnsExperiment.csproj.GenerateResource.Cache
DnsExperiment.MainForm.resources
DnsExperiment.Properties.Resources.resources
Refactor
Properties.Resources.Designer.cs.dll
Settings.settings
/*
 * http://www.iana.org/assignments/dns-parameters
 * 
 * 
 * 
 */


namespace Heijden.DNS
{
	/*
	 * 3.2.2. TYPE values
	 *
	 * TYPE fields are used in resource records.
	 * Note that these types are a subset of QTYPEs.
	 *
	 *		TYPE		value			meaning
	 */
	public enum Type : ushort
	{
		A = 1,				// a IPV4 host address
		NS = 2,				// an authoritative name server
		MD = 3,				// a mail destination (Obsolete - use MX)
		MF = 4,				// a mail forwarder (Obsolete - use MX)
		CNAME = 5,			// the canonical name for an alias
		SOA = 6,			// marks the start of a zone of authority
		MB = 7,				// a mailbox domain name (EXPERIMENTAL)
		MG = 8,				// a mail group member (EXPERIMENTAL)
		MR = 9,				// a mail rename domain name (EXPERIMENTAL)
		NULL = 10,			// a null RR (EXPERIMENTAL)
		WKS = 11,			// a well known service description
		PTR = 12,			// a domain name pointer
		HINFO = 13,			// host information
		MINFO = 14,			// mailbox or mail list information
		MX = 15,			// mail exchange
		TXT = 16,			// text strings

		RP = 17,			// The Responsible Person rfc1183
		AFSDB = 18,			// AFS Data Base location
		X25 = 19,			// X.25 address rfc1183
		ISDN = 20,			// ISDN address rfc1183 
		RT = 21,			// The Route Through rfc1183

		NSAP = 22,			// Network service access point address rfc1706
		NSAPPTR = 23,		// Obsolete, rfc1348

		SIG = 24,			// Cryptographic public key signature rfc2931 / rfc2535
		KEY = 25,			// Public key as used in DNSSEC rfc2535

		PX = 26,			// Pointer to X.400/RFC822 mail mapping information rfc2163

		GPOS = 27,			// Geographical position rfc1712 (obsolete)

		AAAA = 28,			// a IPV6 host address, rfc3596

		LOC = 29,			// Location information rfc1876

		NXT = 30,			// Next Domain, Obsolete rfc2065 / rfc2535

		EID = 31,			// *** Endpoint Identifier (Patton)
		NIMLOC = 32,		// *** Nimrod Locator (Patton)

		SRV = 33,			// Location of services rfc2782

		ATMA = 34,			// *** ATM Address (Dobrowski)

		NAPTR = 35,			// The Naming Authority Pointer rfc3403

		KX = 36,			// Key Exchange Delegation Record rfc2230

		CERT = 37,			// *** CERT RFC2538

		A6 = 38,			// IPv6 address rfc3363 (rfc2874 rfc3226)
		DNAME = 39,			// A way to provide aliases for a whole domain, not just a single domain name as with CNAME. rfc2672

		SINK = 40,			// *** SINK Eastlake
		OPT = 41,			// *** OPT RFC2671

		APL = 42,			// *** APL [RFC3123]

		DS = 43,			// Delegation Signer rfc3658

		SSHFP = 44,			// SSH Key Fingerprint rfc4255
		IPSECKEY = 45,		// IPSECKEY rfc4025
		RRSIG = 46,			// RRSIG rfc3755
		NSEC = 47,			// NSEC rfc3755
		DNSKEY = 48,		// DNSKEY 3755
		DHCID = 49,			// DHCID rfc4701

		NSEC3 = 50,			// NSEC3 rfc5155
		NSEC3PARAM = 51,	// NSEC3PARAM rfc5155

		HIP = 55,			// Host Identity Protocol  [RFC-ietf-hip-dns-09.txt]

		SPF = 99,			// SPF rfc4408

		UINFO = 100,		// *** IANA-Reserved
		UID = 101,			// *** IANA-Reserved
		GID = 102,			// *** IANA-Reserved
		UNSPEC = 103,		// *** IANA-Reserved

		TKEY = 249,			// Transaction key rfc2930
		TSIG = 250,			// Transaction signature rfc2845

		TA=32768,			// DNSSEC Trust Authorities          [Weiler]  13 December 2005
		DLV=32769			// DNSSEC Lookaside Validation       [RFC4431]
	}

	/*
	 * 3.2.3. QTYPE values
	 *
	 * QTYPE fields appear in the question part of a query.  QTYPES are a
	 * superset of TYPEs, hence all TYPEs are valid QTYPEs.  In addition, the
	 * following QTYPEs are defined:
	 *
	 *		QTYPE		value			meaning
	 */
	public enum QType : ushort
	{
		A = Type.A,			// a IPV4 host address
		NS = Type.NS,		// an authoritative name server
		MD = Type.MD,		// a mail destination (Obsolete - use MX)
		MF = Type.MF,		// a mail forwarder (Obsolete - use MX)
		CNAME = Type.CNAME,	// the canonical name for an alias
		SOA = Type.SOA,		// marks the start of a zone of authority
		MB = Type.MB,		// a mailbox domain name (EXPERIMENTAL)
		MG = Type.MG,		// a mail group member (EXPERIMENTAL)
		MR = Type.MR,		// a mail rename domain name (EXPERIMENTAL)
		NULL = Type.NULL,	// a null RR (EXPERIMENTAL)
		WKS = Type.WKS,		// a well known service description
		PTR = Type.PTR,		// a domain name pointer
		HINFO = Type.HINFO,	// host information
		MINFO = Type.MINFO,	// mailbox or mail list information
		MX = Type.MX,		// mail exchange
		TXT = Type.TXT,		// text strings

		RP = Type.RP,		// The Responsible Person rfc1183
		AFSDB = Type.AFSDB,	// AFS Data Base location
		X25 = Type.X25,		// X.25 address rfc1183
		ISDN = Type.ISDN,	// ISDN address rfc1183
		RT = Type.RT,		// The Route Through rfc1183

		NSAP = Type.NSAP,	// Network service access point address rfc1706
		NSAP_PTR = Type.NSAPPTR, // Obsolete, rfc1348

		SIG = Type.SIG,		// Cryptographic public key signature rfc2931 / rfc2535
		KEY = Type.KEY,		// Public key as used in DNSSEC rfc2535

		PX = Type.PX,		// Pointer to X.400/RFC822 mail mapping information rfc2163

		GPOS = Type.GPOS,	// Geographical position rfc1712 (obsolete)

		AAAA = Type.AAAA,	// a IPV6 host address

		LOC = Type.LOC,		// Location information rfc1876

		NXT = Type.NXT,		// Obsolete rfc2065 / rfc2535

		EID = Type.EID,		// *** Endpoint Identifier (Patton)
		NIMLOC = Type.NIMLOC,// *** Nimrod Locator (Patton)

		SRV = Type.SRV,		// Location of services rfc2782

		ATMA = Type.ATMA,	// *** ATM Address (Dobrowski)

		NAPTR = Type.NAPTR,	// The Naming Authority Pointer rfc3403

		KX = Type.KX,		// Key Exchange Delegation Record rfc2230

		CERT = Type.CERT,	// *** CERT RFC2538

		A6 = Type.A6,		// IPv6 address rfc3363
		DNAME = Type.DNAME,	// A way to provide aliases for a whole domain, not just a single domain name as with CNAME. rfc2672

		SINK = Type.SINK,	// *** SINK Eastlake
		OPT = Type.OPT,		// *** OPT RFC2671

		APL = Type.APL,		// *** APL [RFC3123]

		DS = Type.DS,		// Delegation Signer rfc3658

		SSHFP = Type.SSHFP,	// *** SSH Key Fingerprint RFC-ietf-secsh-dns
		IPSECKEY = Type.IPSECKEY, // rfc4025
		RRSIG = Type.RRSIG,	// *** RRSIG RFC-ietf-dnsext-dnssec-2535
		NSEC = Type.NSEC,	// *** NSEC RFC-ietf-dnsext-dnssec-2535
		DNSKEY = Type.DNSKEY,// *** DNSKEY RFC-ietf-dnsext-dnssec-2535
		DHCID = Type.DHCID,	// rfc4701

		NSEC3 = Type.NSEC3,	// RFC5155
		NSEC3PARAM = Type.NSEC3PARAM, // RFC5155

		HIP = Type.HIP,		// RFC-ietf-hip-dns-09.txt

		SPF = Type.SPF,		// RFC4408
		UINFO = Type.UINFO,	// *** IANA-Reserved
		UID = Type.UID,		// *** IANA-Reserved
		GID = Type.GID,		// *** IANA-Reserved
		UNSPEC = Type.UNSPEC,// *** IANA-Reserved

		TKEY = Type.TKEY,	// Transaction key rfc2930
		TSIG = Type.TSIG,	// Transaction signature rfc2845

		IXFR = 251,			// incremental transfer                  [RFC1995]
		AXFR = 252,			// transfer of an entire zone            [RFC1035]
		MAILB = 253,		// mailbox-related RRs (MB, MG or MR)    [RFC1035]
		MAILA = 254,		// mail agent RRs (Obsolete - see MX)    [RFC1035]
		ANY = 255,			// A request for all records             [RFC1035]

		TA = Type.TA,		// DNSSEC Trust Authorities    [Weiler]  13 December 2005
		DLV = Type.DLV		// DNSSEC Lookaside Validation [RFC4431]
	}
	/*
	 * 3.2.4. CLASS values
	 *
	 * CLASS fields appear in resource records.  The following CLASS mnemonics
	 *and values are defined:
	 *
	 *		CLASS		value			meaning
	 */
	public enum Class : ushort
	{
		IN = 1,				// the Internet
		CS = 2,				// the CSNET class (Obsolete - used only for examples in some obsolete RFCs)
		CH = 3,				// the CHAOS class
		HS = 4				// Hesiod [Dyer 87]
	}
	/*
	 * 3.2.5. QCLASS values
	 *
	 * QCLASS fields appear in the question section of a query.  QCLASS values
	 * are a superset of CLASS values; every CLASS is a valid QCLASS.  In
	 * addition to CLASS values, the following QCLASSes are defined:
	 *
	 *		QCLASS		value			meaning
	 */
	public enum QClass : ushort
	{
		IN = Class.IN,		// the Internet
		CS = Class.CS,		// the CSNET class (Obsolete - used only for examples in some obsolete RFCs)
		CH = Class.CH,		// the CHAOS class
		HS = Class.HS,		// Hesiod [Dyer 87]

		ANY = 255			// any class
	}

	/*
RCODE           Response code - this 4 bit field is set as part of
                responses.  The values have the following
                interpretation:
	 */
	public enum RCode
	{
		NoError = 0,		// No Error                           [RFC1035]
		FormErr = 1,		// Format Error                       [RFC1035]
		ServFail = 2,		// Server Failure                     [RFC1035]
		NXDomain = 3,		// Non-Existent Domain                [RFC1035]
		NotImp = 4,			// Not Implemented                    [RFC1035]
		Refused = 5,		// Query Refused                      [RFC1035]
		YXDomain = 6,		// Name Exists when it should not     [RFC2136]
		YXRRSet = 7,		// RR Set Exists when it should not   [RFC2136]
		NXRRSet = 8,		// RR Set that should exist does not  [RFC2136]
		NotAuth = 9,		// Server Not Authoritative for zone  [RFC2136]
		NotZone = 10,		// Name not contained in zone         [RFC2136]

		RESERVED11 = 11,	// Reserved
		RESERVED12 = 12,	// Reserved
		RESERVED13 = 13,	// Reserved
		RESERVED14 = 14,	// Reserved
		RESERVED15 = 15,	// Reserved

		BADVERSSIG = 16,	// Bad OPT Version                    [RFC2671]
							// TSIG Signature Failure             [RFC2845]
		BADKEY = 17,		// Key not recognized                 [RFC2845]
		BADTIME = 18,		// Signature out of time window       [RFC2845]
		BADMODE = 19,		// Bad TKEY Mode                      [RFC2930]
		BADNAME = 20,		// Duplicate key name                 [RFC2930]
		BADALG = 21,		// Algorithm not supported            [RFC2930]
		BADTRUNC = 22		// Bad Truncation                     [RFC4635]
		/*
			23-3840              available for assignment
				0x0016-0x0F00
			3841-4095            Private Use
				0x0F01-0x0FFF
			4096-65535           available for assignment
				0x1000-0xFFFF
		*/

	}

	/*
OPCODE          A four bit field that specifies kind of query in this
                message.  This value is set by the originator of a query
                and copied into the response.  The values are:

                0               a standard query (QUERY)

                1               an inverse query (IQUERY)

                2               a server status request (STATUS)

                3-15            reserved for future use
	 */
	public enum OPCode
	{
		Query = 0,				// a standard query (QUERY)
		IQUERY = 1,				// OpCode Retired (previously IQUERY - No further [RFC3425]
								// assignment of this code available)
		Status = 2,				// a server status request (STATUS) RFC1035
		RESERVED3 = 3,			// IANA

		Notify = 4,				// RFC1996
		Update = 5,				// RFC2136

		RESERVED6 = 6,
		RESERVED7 = 7,
		RESERVED8 = 8,
		RESERVED9 = 9,
		RESERVED10 = 10,
		RESERVED11 = 11,
		RESERVED12 = 12,
		RESERVED13 = 13,
		RESERVED14 = 14,
		RESERVED15 = 15,
	}

	public enum TransportType
	{
		Udp,
		Tcp
	}
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Alphons van der Heijden
Retired Van der Heijden Holding BV
Netherlands Netherlands
I'm Alphons van der Heijden, living in Lelystad, Netherlands, Europa, Earth. And currently I'm retiring from hard working ( ;- ), owning my own company. Because I'm full of energy, and a little to young to relax ...., I don't sit down, but create and recreate software solutions, that I like. Reinventing the wheel is my second nature. My interest is in the area of Internet technologies, .NET etc. I was there in 1992 when Mosaic came out, and from that point, my life changed dramatically, and so did the world, in fact. (Y)

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