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/*
* Copyright (C) 2010-2024 Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <stdint.h>
#include <ostream>
#ifndef OPCODE_H
#define OPCODE_H
namespace isc {
namespace dns {
/// \brief The \c Opcode class objects represent standard OPCODEs
/// of the header section of DNS messages as defined in RFC1035.
///
/// This is a straightforward value class encapsulating the OPCODE code
/// values. Since OPCODEs are 4-bit integers that are used in limited
/// places and it's unlikely that new code values will be assigned, we could
/// represent them as simple integers (via constant variables or enums).
/// However, we define a separate class so that we can benefit from C++
/// type safety as much as possible. For convenience we also provide
/// an enum type for standard OPCDE values, but it is generally advisable
/// to handle OPCODEs through this class. In fact, public interfaces of
/// this library uses this class to pass or return OPCODEs instead of the
/// bare code values.
class Opcode {
public:
/// Constants for standard OPCODE values.
enum CodeValue {
QUERY_CODE = 0, ///< 0: Standard query (RFC1035)
IQUERY_CODE = 1, ///< 1: Inverse query (RFC1035)
STATUS_CODE = 2, ///< 2: Server status request (RFC1035)
RESERVED3_CODE = 3, ///< 3: Reserved for future use (RFC1035)
NOTIFY_CODE = 4, ///< 4: Notify (RFC1996)
UPDATE_CODE = 5, ///< 5: Dynamic update (RFC2136)
RESERVED6_CODE = 6, ///< 6: Reserved for future use (RFC1035)
RESERVED7_CODE = 7, ///< 7: Reserved for future use (RFC1035)
RESERVED8_CODE = 8, ///< 8: Reserved for future use (RFC1035)
RESERVED9_CODE = 9, ///< 9: Reserved for future use (RFC1035)
RESERVED10_CODE = 10, ///< 10: Reserved for future use (RFC1035)
RESERVED11_CODE = 11, ///< 11: Reserved for future use (RFC1035)
RESERVED12_CODE = 12, ///< 12: Reserved for future use (RFC1035)
RESERVED13_CODE = 13, ///< 13: Reserved for future use (RFC1035)
RESERVED14_CODE = 14, ///< 14: Reserved for future use (RFC1035)
RESERVED15_CODE = 15 ///< 15: Reserved for future use (RFC1035)
};
/// \name 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
/// \c Opcode object to be constructed with an invalid state.
//@{
/// \brief Constructor from the code value.
///
/// Since OPCODEs are 4-bit values, parameters larger than 15 are invalid.
/// If \c code is larger than 15 an exception of class \c isc::OutOfRange
/// will be thrown.
///
/// \param code The underlying code value of the \c Opcode.
explicit Opcode(const uint8_t code);
//@}
/// \brief Returns the \c Opcode code value.
///
/// This method never throws an exception.
///
/// \return The underlying code value corresponding to the \c Opcode.
CodeValue getCode() const {
return (code_);
}
/// \brief Return true iff two Opcodes are equal.
///
/// Two Opcodes are equal iff their type codes are equal.
///
/// This method never throws an exception.
///
/// \param other the \c Opcode object to compare against.
/// \return true if the two Opcodes are equal; otherwise false.
bool equals(const Opcode& other) const {
return (code_ == other.code_);
}
/// \brief Same as \c equals().
bool operator==(const Opcode& other) const {
return (equals(other));
}
/// \brief Return true iff two Opcodes are not equal.
///
/// This method never throws an exception.
///
/// \param other the \c Opcode object to compare against.
/// \return true if the two Opcodes are not equal; otherwise false.
bool nequals(const Opcode& other) const {
return (code_ != other.code_);
}
/// \brief Same as \c nequals().
bool operator!=(const Opcode& other) const {
return (nequals(other));
}
/// \brief Convert the \c Opcode to a string.
///
/// 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 "QUERY", etc.
///
/// If resource allocation for the string fails, a corresponding standard
/// exception will be thrown.
///
/// \return A string representation of the \c Opcode.
std::string toText() const;
/// A constant object for the QUERY Opcode.
static const Opcode& QUERY();
/// A constant object for the IQUERY Opcode.
static const Opcode& IQUERY();
/// A constant object for the STATUS Opcode.
static const Opcode& STATUS();
/// A constant object for a reserved (code 3) Opcode.
static const Opcode& RESERVED3();
/// A constant object for the NOTIFY Opcode.
static const Opcode& NOTIFY();
/// A constant object for the UPDATE Opcode.
static const Opcode& UPDATE();
/// A constant object for a reserved (code 6) Opcode.
static const Opcode& RESERVED6();
/// A constant object for a reserved (code 7) Opcode.
static const Opcode& RESERVED7();
/// A constant object for a reserved (code 8) Opcode.
static const Opcode& RESERVED8();
/// A constant object for a reserved (code 9) Opcode.
static const Opcode& RESERVED9();
/// A constant object for a reserved (code 10) Opcode.
static const Opcode& RESERVED10();
/// A constant object for a reserved (code 11) Opcode.
static const Opcode& RESERVED11();
/// A constant object for a reserved (code 12) Opcode.
static const Opcode& RESERVED12();
/// A constant object for a reserved (code 13) Opcode.
static const Opcode& RESERVED13();
/// A constant object for a reserved (code 14) Opcode.
static const Opcode& RESERVED14();
/// A constant object for a reserved (code 15) Opcode.
static const Opcode& RESERVED15();
private:
CodeValue code_;
};
inline const Opcode&
Opcode::QUERY() {
static Opcode c(0);
return (c);
}
inline const Opcode&
Opcode::IQUERY() {
static Opcode c(1);
return (c);
}
inline const Opcode&
Opcode::STATUS() {
static Opcode c(2);
return (c);
}
inline const Opcode&
Opcode::RESERVED3() {
static Opcode c(3);
return (c);
}
inline const Opcode&
Opcode::NOTIFY() {
static Opcode c(4);
return (c);
}
inline const Opcode&
Opcode::UPDATE() {
static Opcode c(5);
return (c);
}
inline const Opcode&
Opcode::RESERVED6() {
static Opcode c(6);
return (c);
}
inline const Opcode&
Opcode::RESERVED7() {
static Opcode c(7);
return (c);
}
inline const Opcode&
Opcode::RESERVED8() {
static Opcode c(8);
return (c);
}
inline const Opcode&
Opcode::RESERVED9() {
static Opcode c(9);
return (c);
}
inline const Opcode&
Opcode::RESERVED10() {
static Opcode c(10);
return (c);
}
inline const Opcode&
Opcode::RESERVED11() {
static Opcode c(11);
return (c);
}
inline const Opcode&
Opcode::RESERVED12() {
static Opcode c(12);
return (c);
}
inline const Opcode&
Opcode::RESERVED13() {
static Opcode c(13);
return (c);
}
inline const Opcode&
Opcode::RESERVED14() {
static Opcode c(14);
return (c);
}
inline const Opcode&
Opcode::RESERVED15() {
static Opcode c(15);
return (c);
}
/// \brief Insert the \c Opcode as a string into stream.
///
/// This method convert \c opcode into a string and inserts it into the
/// output stream \c os.
///
/// \param os A \c std::ostream object on which the insertion operation is
/// performed.
/// \param opcode A reference to an \c Opcode object output by the operation.
/// \return A reference to the same \c std::ostream object referenced by
/// parameter \c os after the insertion operation.
std::ostream& operator<<(std::ostream& os, const Opcode& opcode);
}
}
#endif // OPCODE_H
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