DNS Response Codes (RCODEs) class. More...

#include <rcode.h>

Public Types
enum	CodeValue { NOERROR_CODE = 0 , FORMERR_CODE = 1 , SERVFAIL_CODE = 2 , NXDOMAIN_CODE = 3 , NOTIMP_CODE = 4 , REFUSED_CODE = 5 , YXDOMAIN_CODE = 6 , YXRRSET_CODE = 7 , NXRRSET_CODE = 8 , NOTAUTH_CODE = 9 , NOTZONE_CODE = 10 , RESERVED11_CODE = 11 , RESERVED12_CODE = 12 , RESERVED13_CODE = 13 , RESERVED14_CODE = 14 , RESERVED15_CODE = 15 , BADVERS_CODE = 16 }
	Constants for pre-defined RCODE values. More...

Constructors and Destructor
We use the default versions of destructor, copy constructor, and assignment operator. The default constructor is hidden as a result of defining the other constructors. This is intentional; we don't want to allow an `Rcode` object to be constructed with an invalid state.
	Rcode (const uint16_t code)
	Constructor from the code value.

	Rcode (const uint8_t code, const uint8_t extended_code)
	Constructor from a pair of base and extended parts of code.

uint16_t	getCode () const
	Returns the `Rcode` code value.

uint8_t	getExtendedCode () const
	Returns the upper 8-bit of the `Rcode` code value.

bool	equals (const Rcode &other) const
	Return true iff two Rcodes are equal.

bool	operator== (const Rcode &other) const
	Same as `equals()`.

bool	nequals (const Rcode &other) const
	Return true iff two Rcodes are not equal.

bool	operator!= (const Rcode &other) const
	Same as `nequals()`.

std::string	toText () const
	Convert the `Rcode` to a string.

static const Rcode &	NOERROR ()
	A constant object for the NOERROR Rcode (see `Rcode::NOERROR_CODE`).

static const Rcode &	FORMERR ()
	A constant object for the FORMERR Rcode (see `Rcode::FORMERR_CODE`).

static const Rcode &	SERVFAIL ()
	A constant object for the SERVFAIL Rcode (see `Rcode::SERVFAIL_CODE`).

static const Rcode &	NXDOMAIN ()
	A constant object for the NXDOMAIN Rcode (see `Rcode::NXDOMAIN_CODE`).

static const Rcode &	NOTIMP ()
	A constant object for the NOTIMP Rcode (see `Rcode::NOTIMP_CODE`).

static const Rcode &	REFUSED ()
	A constant object for the REFUSED Rcode (see `Rcode::REFUSED_CODE`).

static const Rcode &	YXDOMAIN ()
	A constant object for the YXDOMAIN Rcode (see `Rcode::YXDOMAIN_CODE`).

static const Rcode &	YXRRSET ()
	A constant object for the YXRRSET Rcode (see `Rcode::YXRRSET_CODE`).

static const Rcode &	NXRRSET ()
	A constant object for the NXRRSET Rcode (see `Rcode::NXRRSET_CODE`).

static const Rcode &	NOTAUTH ()
	A constant object for the NOTAUTH Rcode (see `Rcode::NOTAUTH_CODE`).

static const Rcode &	NOTZONE ()
	A constant object for the NOTZONE Rcode (see `Rcode::NOTZONE_CODE`).

static const Rcode &	RESERVED11 ()
	A constant object for a reserved (code 11) Rcode.

static const Rcode &	RESERVED12 ()
	A constant object for a reserved (code 12) Rcode.

static const Rcode &	RESERVED13 ()
	A constant object for a reserved (code 13) Rcode.

static const Rcode &	RESERVED14 ()
	A constant object for a reserved (code 14) Rcode.

static const Rcode &	RESERVED15 ()
	A constant object for a reserved (code 15) Rcode.

static const Rcode &	BADVERS ()
	A constant object for the BADVERS Rcode (see `Rcode::BADVERS_CODE`).

Detailed Description

DNS Response Codes (RCODEs) class.

The Rcode class objects represent standard Response Codes (RCODEs) of the header section of DNS messages, and extended response codes as defined in the EDNS specification.

Originally RCODEs were defined as 4-bit integers (RFC1035), and then extended to 12 bits as part of the EDNS specification (RFC2671). This API uses the 12-bit version of the definition from the beginning; applications don't have to aware of the original definition except when dealing with the wire-format representation of the EDNS OPT RR (which is rare).

Like the Opcode class, Rcodes could be represented as bare integers, but we define a separate class to benefit from C++ type safety.

For convenience we also provide an enum type for pre-defined RCODE values, but it is generally advisable to handle RCODEs through this class. In fact, public interfaces of this library uses this class to pass or return RCODEs instead of the bare code values.

Definition at line 40 of file rcode.h.

Member Enumeration Documentation

◆ CodeValue

enum isc::dns::Rcode::CodeValue

Constants for pre-defined RCODE values.

Enumerator
NOERROR_CODE	0: No error (RFC1035)
FORMERR_CODE	1: Format error (RFC1035)
SERVFAIL_CODE	2: Server failure (RFC1035)
NXDOMAIN_CODE	3: Name Error (RFC1035)
NOTIMP_CODE	4: Not Implemented (RFC1035)
REFUSED_CODE	5: Refused (RFC1035)
YXDOMAIN_CODE	6: Name unexpectedly exists (RFC2136)
YXRRSET_CODE	7: RRset unexpectedly exists (RFC2136)
NXRRSET_CODE	8: RRset should exist but not (RFC2136)
NOTAUTH_CODE	9: Server isn't authoritative (RFC2136)
NOTZONE_CODE	10: Name is not within the zone (RFC2136)
RESERVED11_CODE	11: Reserved for future use (RFC1035)
RESERVED12_CODE	12: Reserved for future use (RFC1035)
RESERVED13_CODE	13: Reserved for future use (RFC1035)
RESERVED14_CODE	14: Reserved for future use (RFC1035)
RESERVED15_CODE	15: Reserved for future use (RFC1035)
BADVERS_CODE	16: EDNS version not implemented (RFC2671)

Definition at line 43 of file rcode.h.

Constructor & Destructor Documentation

◆ Rcode() [1/2]

isc::dns::Rcode::Rcode ( const uint16_t code )

explicit

Constructor from the code value.

Since RCODEs are 12-bit values, parameters larger than 0xfff are invalid. If code is larger than 0xfff an exception of class isc::OutOfRange will be thrown.

Parameters

code	The underlying 12-bit code value of the `Rcode`.

Definition at line 58 of file rcode.cc.

References isc_throw.

◆ Rcode() [2/2]

isc::dns::Rcode::Rcode	(	const uint8_t	code,
		const uint8_t	extended_code )

Constructor from a pair of base and extended parts of code.

This constructor takes two parameters, one for the lower 4 bits of the code value, the other for the upper 8 bits, and combines them to build a complete 12-bit code value.

The first parameter, code, is the lower 4 bits, and therefore must not exceed 15. Otherwise, an exception of class isc::OutOfRange will be thrown.

This version of constructor is provided specifically for constructing an Rcode from a DNS header and an EDNS OPT RR. Normal applications won't have to use this constructor.

Parameters

code	The lower 4 bits of the underlying code value.
extended_code	The upper 8 bits of the underlying code value.

Definition at line 64 of file rcode.cc.

References isc_throw.

Member Function Documentation

◆ BADVERS()

const Rcode & isc::dns::Rcode::BADVERS ( )

inlinestatic

A constant object for the BADVERS Rcode (see Rcode::BADVERS_CODE).

Definition at line 324 of file rcode.h.

Referenced by isc::dns::DNSMessageBADVERS::getRcode().

◆ equals()

bool isc::dns::Rcode::equals ( const Rcode & other ) const

inline

Return true iff two Rcodes are equal.

Two Rcodes are equal iff their type codes are equal.

This method never throws an exception.

Parameters

other the Rcode object to compare against.

Returns: true if the two Rcodes are equal; otherwise false.

Definition at line 129 of file rcode.h.

Referenced by operator==().

◆ FORMERR()

const Rcode & isc::dns::Rcode::FORMERR ( )

inlinestatic

A constant object for the FORMERR Rcode (see Rcode::FORMERR_CODE).

Definition at line 234 of file rcode.h.

Referenced by isc::dns::TSIGError::FORMERR(), and isc::dns::DNSMessageFORMERR::getRcode().

◆ getCode()

uint16_t isc::dns::Rcode::getCode ( ) const

inline

Returns the Rcode code value.

This method never throws an exception.

Returns: The underlying code value corresponding to the Rcode.

Definition at line 106 of file rcode.h.

◆ getExtendedCode()

uint8_t isc::dns::Rcode::getExtendedCode ( ) const

Returns the upper 8-bit of the Rcode code value.

Normal applications won't have to use this method. This is provided in case the upper 8 bits are necessary for the EDNS protocol processing.

This method never throws an exception.

Returns: The upper 8-bit of the underlying code value.

Definition at line 75 of file rcode.cc.

◆ nequals()

bool isc::dns::Rcode::nequals ( const Rcode & other ) const

inline

Return true iff two Rcodes are not equal.

This method never throws an exception.

Parameters

other the Rcode object to compare against.

Returns: true if the two Rcodes are not equal; otherwise false.

Definition at line 144 of file rcode.h.

Referenced by operator!=().

◆ NOERROR()

const Rcode & isc::dns::Rcode::NOERROR ( )

inlinestatic

A constant object for the NOERROR Rcode (see Rcode::NOERROR_CODE).

Definition at line 228 of file rcode.h.

◆ NOTAUTH()

const Rcode & isc::dns::Rcode::NOTAUTH ( )

inlinestatic

A constant object for the NOTAUTH Rcode (see Rcode::NOTAUTH_CODE).

Definition at line 282 of file rcode.h.

Referenced by isc::dns::TSIGError::NOTAUTH(), and isc::dns::TSIGError::toRcode().

◆ NOTIMP()

const Rcode & isc::dns::Rcode::NOTIMP ( )

inlinestatic

A constant object for the NOTIMP Rcode (see Rcode::NOTIMP_CODE).

Definition at line 252 of file rcode.h.

Referenced by isc::dns::TSIGError::NOTIMP().

◆ NOTZONE()

const Rcode & isc::dns::Rcode::NOTZONE ( )

inlinestatic

A constant object for the NOTZONE Rcode (see Rcode::NOTZONE_CODE).

Definition at line 288 of file rcode.h.

Referenced by isc::dns::TSIGError::NOTZONE().

◆ NXDOMAIN()

const Rcode & isc::dns::Rcode::NXDOMAIN ( )

inlinestatic

A constant object for the NXDOMAIN Rcode (see Rcode::NXDOMAIN_CODE).

Definition at line 246 of file rcode.h.

Referenced by isc::dns::TSIGError::NXDOMAIN(), isc::d2::CheckExistsAddTransaction::replacingFwdAddrsHandler(), and isc::d2::NameAddTransaction::replacingFwdAddrsHandler().

◆ NXRRSET()

const Rcode & isc::dns::Rcode::NXRRSET ( )

inlinestatic

A constant object for the NXRRSET Rcode (see Rcode::NXRRSET_CODE).

Definition at line 276 of file rcode.h.

◆ operator!=()

bool isc::dns::Rcode::operator!= ( const Rcode & other ) const

inline

Same as nequals().

Definition at line 149 of file rcode.h.

References nequals().

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◆ operator==()

bool isc::dns::Rcode::operator== ( const Rcode & other ) const

inline

Same as equals().

Definition at line 134 of file rcode.h.

References equals().

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◆ REFUSED()

const Rcode & isc::dns::Rcode::REFUSED ( )

inlinestatic

A constant object for the REFUSED Rcode (see Rcode::REFUSED_CODE).

Definition at line 258 of file rcode.h.

Referenced by isc::dns::TSIGError::REFUSED().

◆ RESERVED11()

const Rcode & isc::dns::Rcode::RESERVED11 ( )

inlinestatic

A constant object for a reserved (code 11) Rcode.

(see Rcode::RESERVED11_CODE).

Definition at line 294 of file rcode.h.

Referenced by isc::dns::TSIGError::RESERVED11().

◆ RESERVED12()

const Rcode & isc::dns::Rcode::RESERVED12 ( )

inlinestatic

A constant object for a reserved (code 12) Rcode.

(see Rcode::RESERVED12_CODE).

Definition at line 300 of file rcode.h.

Referenced by isc::dns::TSIGError::RESERVED12().

◆ RESERVED13()

const Rcode & isc::dns::Rcode::RESERVED13 ( )

inlinestatic

A constant object for a reserved (code 13) Rcode.

(see Rcode::RESERVED13_CODE).

Definition at line 306 of file rcode.h.

Referenced by isc::dns::TSIGError::RESERVED13().

◆ RESERVED14()

const Rcode & isc::dns::Rcode::RESERVED14 ( )

inlinestatic

A constant object for a reserved (code 14) Rcode.

(see Rcode::RESERVED14_CODE).

Definition at line 312 of file rcode.h.

Referenced by isc::dns::TSIGError::RESERVED14().

◆ RESERVED15()

const Rcode & isc::dns::Rcode::RESERVED15 ( )

inlinestatic

A constant object for a reserved (code 15) Rcode.

(see Rcode::RESERVED15_CODE).

Definition at line 318 of file rcode.h.

Referenced by isc::dns::TSIGError::RESERVED15().

◆ SERVFAIL()

const Rcode & isc::dns::Rcode::SERVFAIL ( )

inlinestatic

A constant object for the SERVFAIL Rcode (see Rcode::SERVFAIL_CODE).

Definition at line 240 of file rcode.h.

Referenced by isc::dns::TSIGError::SERVFAIL(), and isc::dns::TSIGError::toRcode().

◆ toText()

string isc::dns::Rcode::toText ( ) const

Convert the Rcode to a string.

For pre-defined code values (see Rcode::CodeValue), this method returns a string representation of the "mnemonic' used for the enum and constant objects. For example, the string for code value 0 is "NOERROR", etc. For other code values it returns a string representation of the decimal number of the value, e.g. "32", "100", etc.

If resource allocation for the string fails, a corresponding standard exception will be thrown.

Returns: A string representation of the Rcode.

Definition at line 80 of file rcode.cc.

◆ YXDOMAIN()

const Rcode & isc::dns::Rcode::YXDOMAIN ( )

inlinestatic

A constant object for the YXDOMAIN Rcode (see Rcode::YXDOMAIN_CODE).

Definition at line 264 of file rcode.h.

Referenced by isc::d2::CheckExistsAddTransaction::addingFwdAddrsHandler(), isc::d2::NameAddTransaction::addingFwdAddrsHandler(), and isc::dns::TSIGError::YXDOMAIN().

◆ YXRRSET()

const Rcode & isc::dns::Rcode::YXRRSET ( )

inlinestatic

A constant object for the YXRRSET Rcode (see Rcode::YXRRSET_CODE).

Definition at line 270 of file rcode.h.

Referenced by isc::dns::TSIGError::YXRRSET().

The documentation for this class was generated from the following files:

Public Types

Constructors and Destructor

Detailed Description

Member Enumeration Documentation

◆ CodeValue

Constructor & Destructor Documentation

◆ Rcode() [1/2]

◆ Rcode() [2/2]

Member Function Documentation

◆ BADVERS()

◆ equals()

◆ FORMERR()

◆ getCode()

◆ getExtendedCode()

◆ nequals()

◆ NOERROR()

◆ NOTAUTH()

◆ NOTIMP()

◆ NOTZONE()

◆ NXDOMAIN()

◆ NXRRSET()

◆ operator!=()

◆ operator==()

◆ REFUSED()

◆ RESERVED11()

◆ RESERVED12()

◆ RESERVED13()

◆ RESERVED14()

◆ RESERVED15()

◆ SERVFAIL()

◆ toText()

◆ YXDOMAIN()

◆ YXRRSET()