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

#include <token.h>

Inheritance diagram for isc::dhcp::TokenPkt4:

Public Types
enum	FieldType : int { 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)

virtual unsigned	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 unsigned	getLabel () const
	Return the label of this token.

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 619 of file token.h.

Member Enumeration Documentation

◆ FieldType

enum isc::dhcp::TokenPkt4::FieldType : int

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 623 of file token.h.

Constructor & Destructor Documentation

◆ TokenPkt4()

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

inline

Constructor (does nothing)

Definition at line 636 of file token.h.

Member Function Documentation

◆ evaluate()

unsigned 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)

Returns: 0 which means evaluate next token if any.

Implements isc::dhcp::Token.

Definition at line 560 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::getHWAddr(), GIADDR, HLEN, HTYPE, isc_throw, LOG_DEBUG, MSGTYPE, SIADDR, TRANSID, and YIADDR.

Here is the call graph for this function:

◆ 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 655 of file token.h.

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

Public Types

Public Member Functions

Additional Inherited Members