isc::dhcp::TokenPkt4 Class Reference

Token that represents fields of a DHCPv4 packet. More...

#include <token.h>

Inheritance diagram for isc::dhcp::TokenPkt4:

Public Types
enum	FieldType {   CHADDR , GIADDR , CIADDR , YIADDR ,   SIADDR , HLEN , HTYPE , MSGTYPE ,   TRANSID }
	enum value that determines the field. More...

Public Member Functions
	TokenPkt4 (const FieldType type)
	Constructor (does nothing)
void	evaluate (Pkt &pkt, ValueStack &values)
	Gets a value from the specified packet.
FieldType	getType ()
	Returns field type.
Public Member Functions inherited from isc::dhcp::Token
virtual	~Token ()
	Virtual destructor.
virtual void	evaluate (Pkt &pkt, ValueStack &values)=0
	This is a generic method for evaluating a packet.

Additional Inherited Members
Static Public Member Functions inherited from isc::dhcp::Token
static bool	toBool (std::string value)
	Coverts a (string) value to a boolean.

Detailed Description

Token that represents fields of a DHCPv4 packet.

For example in the expression pkt4.chaddr == 0x0102030405 this token represents the pkt4.chaddr expression.

Currently supported fields are:

• chaddr (client hardware address, hlen [0..16] octets)
• giaddr (relay agent IP address, 4 octets)
• ciaddr (client IP address, 4 octets)
• yiaddr ('your' (client) IP address, 4 octets)
• siaddr (next server IP address, 4 octets)
• hlen (hardware address length, padded to 4 octets)
• htype (hardware address type, padded to 4 octets)

Definition at line 589 of file token.h.

Member Enumeration Documentation

FieldType

enum isc::dhcp::TokenPkt4::FieldType

enum value that determines the field.

Enumerator
CHADDR	chaddr field (up to 16 bytes link-layer address)
GIADDR	giaddr (IPv4 address)
CIADDR	ciaddr (IPv4 address)
YIADDR	yiaddr (IPv4 address)
SIADDR	siaddr (IPv4 address)
HLEN	hlen (hardware address length)
HTYPE	htype (hardware address type)
MSGTYPE	message type (not really a field, content of option 53)
TRANSID	transaction-id (xid)

Definition at line 593 of file token.h.

Constructor & Destructor Documentation

TokenPkt4()

isc::dhcp::TokenPkt4::TokenPkt4 ( const FieldType  type )

inline

Constructor (does nothing)

Definition at line 606 of file token.h.

Member Function Documentation

evaluate()

void TokenPkt4::evaluate ( Pkt &  pkt, ValueStack &  values  )

virtual

Gets a value from the specified packet.

Evaluation uses fields available in the packet. It does not require any values to be present on the stack.

Exceptions

EvalTypeError

when called for DHCPv6 packet

Parameters

pkt	- fields will be extracted from here
values	- stack of values (1 result will be pushed)

Implements isc::dhcp::Token.

Definition at line 515 of file token.cc.

References CHADDR, CIADDR, isc::dhcp::EVAL_DBG_STACK, isc::dhcp::EVAL_DEBUG_PKT4, isc::dhcp::eval_logger, isc::eval::EvalContext::fromUint32(), isc::dhcp::Pkt4::getCiaddr(), isc::dhcp::Pkt4::getGiaddr(), isc::dhcp::Pkt4::getHlen(), isc::dhcp::Pkt4::getHtype(), isc::dhcp::Pkt4::getHWAddr(), isc::dhcp::Pkt4::getSiaddr(), isc::dhcp::Pkt::getTransid(), isc::dhcp::Pkt4::getType(), isc::dhcp::Pkt4::getYiaddr(), GIADDR, HLEN, HTYPE, isc_throw, LOG_DEBUG, MSGTYPE, SIADDR, isc::asiolink::IOAddress::toBytes(), TRANSID, and YIADDR.

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getType()

FieldType isc::dhcp::TokenPkt4::getType ( )

inline

Returns field type.

This method is used only in tests.

Returns

type of the field.

Definition at line 624 of file token.h.

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

• token.h
• token.cc