isc::dhcp::TokenRelay4Option Class Reference

Represents a sub-option inserted by the DHCPv4 relay. More...

#include <token.h>

Inheritance diagram for isc::dhcp::TokenRelay4Option:

Public Member Functions
	TokenRelay4Option (const uint16_t option_code, const RepresentationType &rep_type)
	Constructor for extracting sub-option from RAI (option 82)
Public Member Functions inherited from isc::dhcp::TokenOption
	TokenOption (const uint16_t option_code, const RepresentationType &rep_type)
	Constructor that takes an option code as a parameter.
virtual unsigned	evaluate (Pkt &pkt, ValueStack &values)
	Evaluates the values of the option.
uint16_t	getCode () const
	Returns option-code.
RepresentationType	getRepresentation () const
	Returns representation-type.
Public Member Functions inherited from isc::dhcp::Token
virtual	~Token ()
	Virtual destructor.
virtual unsigned	getLabel () const
	Return the label of this token.

Protected Member Functions
virtual OptionPtr	getOption (Pkt &pkt)
	Attempts to obtain specified sub-option of option 82 from the packet.
Protected Member Functions inherited from isc::dhcp::TokenOption
virtual std::string	pushFailure (ValueStack &values)
	Auxiliary method that puts string representing a failure.

Additional Inherited Members
Public Types inherited from isc::dhcp::TokenOption
enum	RepresentationType { TEXTUAL , HEXADECIMAL , EXISTS }
	Token representation type. More...
Static Public Member Functions inherited from isc::dhcp::Token
static bool	toBool (std::string value)
	Coverts a (string) value to a boolean.
Protected Attributes inherited from isc::dhcp::TokenOption
uint16_t	option_code_
	Code of the option to be extracted.
RepresentationType	representation_type_
	Representation type.

Detailed Description

Represents a sub-option inserted by the DHCPv4 relay.

DHCPv4 relays insert sub-options in option 82. This token attempts to extract such sub-options. Note in DHCPv6 it is radically different (possibly many encapsulation levels), thus there are separate classes for v4 and v6.

This token can represent the following expressions: relay[13].text - Textual representation of sub-option 13 in RAI (option 82) relay[13].hex - Binary representation of sub-option 13 in RAI (option 82) relay[vendor-class].text - Text representation of sub-option X in RAI (option 82) relay[vendor-class].hex - Binary representation of sub-option X in RAI (option 82)

Definition at line 495 of file token.h.

Constructor & Destructor Documentation

TokenRelay4Option()

TokenRelay4Option::TokenRelay4Option	(	const uint16_t	option_code,
		const RepresentationType &	rep_type )

Constructor for extracting sub-option from RAI (option 82)

Parameters

option_code	code of the requested sub-option
rep_type	code representation (currently .hex and .text are supported)

Definition at line 453 of file token.cc.

Member Function Documentation

getOption()

OptionPtr TokenRelay4Option::getOption ( Pkt & pkt )

protectedvirtual

Attempts to obtain specified sub-option of option 82 from the packet.

Parameters

pkt	DHCPv4 packet (that hopefully contains option 82)

Returns

found sub-option from option 82

Reimplemented from isc::dhcp::TokenOption.

Definition at line 459 of file token.cc.

References isc::dhcp::DHO_DHCP_AGENT_OPTIONS, isc::dhcp::Pkt::getOption(), and isc::dhcp::TokenOption::option_code_.

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

• token.h
• token.cc