isc::perfdhcp::PerfPkt4 Class Reference

PerfPkt4 (DHCPv4 packet) More...

#include <perf_pkt4.h>

Inheritance diagram for isc::perfdhcp::PerfPkt4:

Public Types
typedef boost::shared_ptr< LocalizedOption >	LocalizedOptionPtr
	Localized option pointer type.

Public Member Functions
	PerfPkt4 (const uint8_t *buf, size_t len, size_t transid_offset=1, uint32_t transid=0)
	Constructor, used to create messages from packet template files.
size_t	getTransidOffset () const
	Returns transaction id offset in packet buffer.
bool	rawPack ()
	Prepares on-wire format from raw buffer.
bool	rawUnpack ()
	Handles limited binary packet parsing for packets with custom offsets of options and transaction ID.
void	writeAt (size_t dest_pos, std::vector< uint8_t >::iterator first, std::vector< uint8_t >::iterator last)
	Replace contents of buffer with data.
template<typename T >
void	writeValueAt (size_t dest_pos, T val)
	Replace contents of buffer with value.
Public Member Functions inherited from isc::dhcp::Pkt4
	Pkt4 (const uint8_t *data, size_t len)
	Constructor, used in message reception.
	Pkt4 (uint8_t msg_type, uint32_t transid)
	Constructor, used in replying to a message.
virtual void	addOption (const OptionPtr &opt)
	Add an option.
const isc::asiolink::IOAddress &	getCiaddr () const
	Returns ciaddr field.
std::list< uint16_t > &	getDeferredOptions ()
	Returns a reference to option codes which unpacking will be deferred.
const OptionBuffer	getFile () const
	Returns file field.
uint16_t	getFlags () const
	Returns flags field.
const isc::asiolink::IOAddress &	getGiaddr () const
	Returns giaddr field.
uint8_t	getHlen () const
	Returns hlen field.
uint8_t	getHops () const
	Returns hops field.
uint8_t	getHtype () const
	Returns htype field.
HWAddrPtr	getHWAddr () const
	returns hardware address information
std::string	getHWAddrLabel () const
	Returns text representation of the hardware address.
std::string	getLabel () const
	Returns text representation of the primary packet identifiers.
HWAddrPtr	getLocalHWAddr () const
	Returns local HW address.
const char *	getName () const
	Returns name of the DHCP message.
uint8_t	getOp () const
	Returns op field.
uint16_t	getSecs () const
	Returns secs field.
const isc::asiolink::IOAddress &	getSiaddr () const
	Returns siaddr field.
const OptionBuffer	getSname () const
	Returns sname field.
uint8_t	getType () const
	Returns DHCP message type (e.g.
const isc::asiolink::IOAddress &	getYiaddr () const
	Returns yiaddr field.
virtual bool	isDhcp4o6 () const
	Checks if a DHCPv4 message has been transported over DHCPv6.
bool	isRelayed () const
	Checks if a DHCPv4 message has been relayed.
size_t	len ()
	Returns the size of the required buffer to build the packet.
virtual void	pack ()
	Prepares on-wire format of DHCPv4 packet.
void	setCiaddr (const isc::asiolink::IOAddress &ciaddr)
	Sets ciaddr field.
void	setFile (const uint8_t *file, size_t file_len)
	Sets file field.
void	setFlags (uint16_t flags)
	Sets flags field.
void	setGiaddr (const isc::asiolink::IOAddress &giaddr)
	Sets giaddr field.
void	setHops (uint8_t hops)
	Sets hops field.
void	setHWAddr (const HWAddrPtr &addr)
	Sets hardware address.
void	setHWAddr (uint8_t htype, uint8_t hlen, const std::vector< uint8_t > &mac_addr)
	Sets hardware address.
void	setLocalHWAddr (const HWAddrPtr &addr)
	Sets local HW address.
void	setLocalHWAddr (const uint8_t htype, const uint8_t hlen, const std::vector< uint8_t > &mac_addr)
	Sets local HW address.
void	setSecs (uint16_t secs)
	Sets secs field.
void	setSiaddr (const isc::asiolink::IOAddress &siaddr)
	Sets siaddr field.
void	setSname (const uint8_t *sname, size_t sname_len)
	Sets sname field.
void	setType (uint8_t type)
	Sets DHCP message type (e.g.
void	setYiaddr (const isc::asiolink::IOAddress &yiaddr)
	Sets yiaddr field.
std::string	toText () const
	Returns text representation of the packet.
virtual void	unpack ()
	Parses on-wire form of DHCPv4 packet.
Public Member Functions inherited from isc::dhcp::Pkt
virtual	~Pkt ()
	Virtual destructor.
void	addAdditionalClass (const isc::dhcp::ClientClass &client_class)
	Adds a specified class to the packet's additional class list.
void	addClass (const isc::dhcp::ClientClass &client_class)
	Adds a specified class to the packet.
void	addPktEvent (const std::string &label, const boost::posix_time::ptime &timestamp=PktEvent::now())
	Adds an event to the end of the event stack.
void	addPktEvent (const std::string &label, const struct timeval &timestamp)
	Adds an event to the end of the event stack with the timestamp specified as a struct timeval.
void	addSubClass (const isc::dhcp::ClientClass &class_def, const isc::dhcp::ClientClass &subclass)
	Adds a specified subclass to the packet.
void	clearPktEvents ()
	Discards contents of the packet event stack.
OptionCollection	cloneOptions ()
	Clones all options so that they can be safely modified.
bool	delOption (uint16_t type)
	Attempts to delete first suboption of requested type.
std::string	dumpPktEvents (bool verbose=false) const
	Creates a dump of the stack contents to a string for logging.
const ClientClasses &	getAdditionalClasses () const
	Returns the additional class list.
isc::util::OutputBuffer &	getBuffer ()
	Returns reference to output buffer.
const ClientClasses &	getClasses () const
	Returns the class set.
std::string	getIface () const
	Returns interface name.
int	getIndex () const
	Returns interface index.
const isc::asiolink::IOAddress &	getLocalAddr () const
	Returns local IP address.
uint16_t	getLocalPort () const
	Returns local UDP (and soon TCP) port.
HWAddrPtr	getMAC (uint32_t hw_addr_src)
	Returns MAC address.
OptionPtr	getOption (const uint16_t type)
	Returns the first option of specified type.
isc::dhcp::OptionCollection	getOptions (const uint16_t type)
	Returns all instances of specified type.
const std::list< PktEvent > &	getPktEvents ()
	Fetches the current event stack contents.
boost::posix_time::ptime	getPktEventTime (const std::string &label) const
	Fetches the timestamp for a given event in the stack.
const isc::asiolink::IOAddress &	getRemoteAddr () const
	Returns remote IP address.
HWAddrPtr	getRemoteHWAddr () const
	Returns the remote HW address obtained from raw sockets.
uint16_t	getRemotePort () const
	Returns remote port.
const SubClassRelationContainer &	getSubClassesRelations () const
	Returns the class set including template classes associated with subclasses.
const boost::posix_time::ptime &	getTimestamp () const
	Returns packet timestamp.
uint32_t	getTransid () const
	Returns value of transaction-id field.
bool	inClass (const isc::dhcp::ClientClass &client_class)
	Checks whether a client belongs to a given class.
bool	indexSet () const
	Checks if interface index has been set.
bool	isCopyRetrievedOptions () const
	Returns whether the copying of retrieved options is enabled.
void	repack ()
	Copies content of input buffer to output buffer.
void	resetIndex ()
	Resets interface index to negative value.
virtual void	setCopyRetrievedOptions (const bool copy)
	Controls whether the option retrieved by the Pkt::getOption should be copied before being returned.
void	setIface (const std::string &iface)
	Sets interface name.
void	setIndex (const unsigned int ifindex)
	Sets interface index.
void	setLocalAddr (const isc::asiolink::IOAddress &local)
	Sets local IP address.
void	setLocalPort (uint16_t local)
	Sets local UDP (and soon TCP) port.
void	setPktEvent (const std::string &label, const boost::posix_time::ptime &timestamp=PktEvent::now())
	Updates (or adds) an event in the event stack.
void	setRemoteAddr (const isc::asiolink::IOAddress &remote)
	Sets remote IP address.
void	setRemoteHWAddr (const HWAddrPtr &hw_addr)
	Sets remote hardware address.
void	setRemoteHWAddr (const uint8_t htype, const uint8_t hlen, const std::vector< uint8_t > &hw_addr)
	Sets remote hardware address.
void	setRemotePort (uint16_t remote)
	Sets remote UDP (and soon TCP) port.
void	setTimestamp (boost::posix_time::ptime &timestamp)
	Set socket receive timestamp.
void	setTransid (uint32_t transid)
	Sets transaction-id value.
void	updateTimestamp ()
	Update packet timestamp.
Public Member Functions inherited from isc::hooks::CalloutHandleAssociate
	CalloutHandleAssociate ()
	Constructor.
CalloutHandlePtr	getCalloutHandle ()
	Returns callout handle.
void	resetCalloutHandle ()
	Reset callout handle.

Additional Inherited Members
Static Public Member Functions inherited from isc::dhcp::Pkt4
static const char *	getName (const uint8_t type)
	Returns name of the DHCP message for a given type number.
static std::string	makeLabel (const HWAddrPtr &hwaddr, const ClientIdPtr &client_id)
	Returns text representation of the given packet identifiers.
static std::string	makeLabel (const HWAddrPtr &hwaddr, const ClientIdPtr &client_id, const uint32_t transid)
	Returns text representation of the given packet identifiers.
Public Attributes inherited from isc::dhcp::Pkt
ClientClasses	additional_classes_
	Classes to be evaluated during additional class evaluation.
ClientClasses	classes_
	Classes this packet belongs to.
OptionBuffer	data_
	Unparsed data (in received packets).
isc::dhcp::OptionCollection	options_
	Collection of options present in this message.
SubClassRelationContainer	subclasses_
	SubClasses this packet belongs to.
Static Public Attributes inherited from isc::dhcp::Pkt4
static const size_t	DHCPV4_PKT_HDR_LEN = 236
	specifies DHCPv4 packet header length (fixed part)
static const uint16_t	FLAG_BROADCAST_MASK = 0x8000
	Mask for the value of flags field in the DHCPv4 message to check whether client requested broadcast response.
static const size_t	MAX_CHADDR_LEN = 16
	length of the CHADDR field in DHCPv4 message
static const size_t	MAX_FILE_LEN = 128
	length of the FILE field in DHCPv4 message
static const size_t	MAX_SNAME_LEN = 64
	length of the SNAME field in DHCPv4 message
Protected Member Functions inherited from isc::dhcp::Pkt4
uint8_t	DHCPTypeToBootpType (uint8_t dhcpType)
	converts DHCP message type to BOOTP op type
virtual HWAddrPtr	getMACFromDocsisCMTS ()
	No-op.
virtual HWAddrPtr	getMACFromDocsisModem ()
	No-op.
virtual HWAddrPtr	getMACFromDUID ()
	No-op.
virtual HWAddrPtr	getMACFromIPv6RelayOpt ()
	No-op.
virtual HWAddrPtr	getMACFromRemoteIdRelayOption ()
	No-op.
virtual HWAddrPtr	getMACFromSrcLinkLocalAddr ()
	No-op.
Protected Member Functions inherited from isc::dhcp::Pkt
	Pkt (const uint8_t *buf, uint32_t len, const isc::asiolink::IOAddress &local_addr, const isc::asiolink::IOAddress &remote_addr, uint16_t local_port, uint16_t remote_port)
	Constructor.
	Pkt (uint32_t transid, const isc::asiolink::IOAddress &local_addr, const isc::asiolink::IOAddress &remote_addr, uint16_t local_port, uint16_t remote_port)
	Constructor.
HWAddrPtr	getMACFromIPv6 (const isc::asiolink::IOAddress &addr)
	Attempts to convert IPv6 address into MAC.
OptionPtr	getNonCopiedOption (const uint16_t type) const
	Returns the first option of specified type without copying.
OptionCollection	getNonCopiedOptions (const uint16_t opt_type) const
	Returns all option instances of specified type without copying.
Protected Attributes inherited from isc::dhcp::Pkt4
isc::asiolink::IOAddress	ciaddr_
	ciaddr field (32 bits): Client's IP address
std::list< uint16_t >	deferred_options_
uint8_t	file_ [MAX_FILE_LEN]
	file field (128 bytes)
uint16_t	flags_
	flags
isc::asiolink::IOAddress	giaddr_
	giaddr field (32 bits): Gateway IP address
uint8_t	hops_
	Number of relay agents traversed.
HWAddrPtr	hwaddr_
	link-layer address and hardware information represents 3 fields: htype (hardware type, 1 byte), hlen (length of the hardware address, up to 16) and chaddr (hardware address field, 16 bytes)
HWAddrPtr	local_hwaddr_
	local HW address (dst if receiving packet, src if sending packet)
uint8_t	op_
	message operation code
uint16_t	secs_
	elapsed (number of seconds since beginning of transmission)
isc::asiolink::IOAddress	siaddr_
	siaddr field (32 bits): next server IP address in boot process(e.g.TFTP)
uint8_t	sname_ [MAX_SNAME_LEN]
	sname field (64 bytes)
isc::asiolink::IOAddress	yiaddr_
	yiaddr field (32 bits): Client's IP address ("your"), set by server
Protected Attributes inherited from isc::dhcp::Pkt
isc::util::OutputBuffer	buffer_out_
	Output buffer (used during message transmission)
bool	copy_retrieved_options_
	Indicates if a copy of the retrieved option should be returned when Pkt::getOption is called.
std::string	iface_
	Name of the network interface the packet was received/to be sent over.
unsigned int	ifindex_
	Interface index.
isc::asiolink::IOAddress	local_addr_
	Local IP (v4 or v6) address.
uint16_t	local_port_
	local TDP or UDP port
isc::asiolink::IOAddress	remote_addr_
	Remote IP address.
HWAddrPtr	remote_hwaddr_
uint16_t	remote_port_
	remote TCP or UDP port
boost::posix_time::ptime	timestamp_
	packet timestamp
uint32_t	transid_
	Transaction-id (32 bits for v4, 24 bits for v6)
Protected Attributes inherited from isc::hooks::CalloutHandleAssociate
CalloutHandlePtr	callout_handle_
	Callout handle stored.

Detailed Description

PerfPkt4 (DHCPv4 packet)

This class extends the functionality of isc::dhcp::Pkt4 by adding the ability to specify an options offset in the DHCP message and to override options' contents. This is particularly useful when we create a packet object using a template file (i.e. do not build it dynamically). The client class should read data from the template file and pass it to this class in a buffer.

The contents of such a packet can be later partially replaced, notably the selected options and the transaction ID. (The transaction ID and its offset in the template file are passed via the constructor.)

In order to replace contents of the options, the client class has to create a collection of LocalizedOption, adding them using dhcp::Pkt4::addOption.

Note

If you don't use template files simply use constructors inherited from parent class and isc::dhcp::Option type instead

Definition at line 42 of file perf_pkt4.h.

Member Typedef Documentation

LocalizedOptionPtr

typedef boost::shared_ptr<LocalizedOption> isc::perfdhcp::PerfPkt4::LocalizedOptionPtr

Localized option pointer type.

Definition at line 46 of file perf_pkt4.h.

Constructor & Destructor Documentation

PerfPkt4()

isc::perfdhcp::PerfPkt4::PerfPkt4	(	const uint8_t *	buf,
		size_t	len,
		size_t	transid_offset = 1,
		uint32_t	transid = 0 )

Constructor, used to create messages from packet template files.

Creates a new DHCPv4 message using the provided buffer. The transaction ID and its offset are specified via this constructor. The transaction ID is stored in outgoing message when client class calls PerfPkt4::rawPack. Transaction id offset value is used for incoming and outgoing messages to identify transaction ID field's position in incoming and outgoing messages.

Parameters

buf	buffer holding contents of the message (this can be directly read from template file).
len	length of the data in the buffer.
transid_offset	transaction id offset in a message.
transid	transaction id to be stored in outgoing message.

Definition at line 21 of file perf_pkt4.cc.

References isc::dhcp::Pkt::setTransid().

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Member Function Documentation

getTransidOffset()

size_t isc::perfdhcp::PerfPkt4::getTransidOffset ( ) const

inline

Returns transaction id offset in packet buffer.

Returns

Transaction ID offset in packet buffer

Definition at line 72 of file perf_pkt4.h.

Referenced by rawPack(), and rawUnpack().

rawPack()

bool isc::perfdhcp::PerfPkt4::rawPack

(

)

Prepares on-wire format from raw buffer.

The method copies the buffer provided in the constructor to the output buffer and replaces the transaction ID and selected options with new data.

Note

Use this method to prepare an on-wire DHCPv4 message when you use template packets that require replacement of selected options' contents before sending.

Returns

false ID pack operation failed.

Definition at line 31 of file perf_pkt4.cc.

References isc::dhcp::Pkt::buffer_out_, isc::dhcp::Pkt::data_, isc::dhcp::Pkt::getTransid(), getTransidOffset(), isc::dhcp::Pkt::options_, isc::perfdhcp::PktTransform::pack(), and isc::dhcp::Option::V4.

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rawUnpack()

bool isc::perfdhcp::PerfPkt4::rawUnpack

(

)

Handles limited binary packet parsing for packets with custom offsets of options and transaction ID.

This method handles the parsing of packets that have custom offsets of options or transaction ID. Use isc::dhcp::Pkt4::addOption to specify which options to parse. Options should be of the isc::perfdhcp::LocalizedOption type with offset values provided. Each added option will be updated with actual data read from the binary packet buffer.

Returns

false If unpack operation failed.

Definition at line 41 of file perf_pkt4.cc.

References isc::dhcp::Pkt::data_, isc::dhcp::Pkt::getTransid(), getTransidOffset(), isc::dhcp::Pkt::options_, isc::dhcp::Pkt::setTransid(), isc::perfdhcp::PktTransform::unpack(), and isc::dhcp::Option::V4.

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writeAt()

void isc::perfdhcp::PerfPkt4::writeAt	(	size_t	dest_pos,
		std::vector< uint8_t >::iterator	first,
		std::vector< uint8_t >::iterator	last )

Replace contents of buffer with data.

Function replaces part of the buffer with data from vector.

Parameters

dest_pos	position in buffer where data is replaced.
first	beginning of data range in source vector.
last	end of data range in source vector.

Definition at line 55 of file perf_pkt4.cc.

References isc::dhcp::Pkt::data_, and isc::perfdhcp::PktTransform::writeAt().

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writeValueAt()

template<typename T >

void isc::perfdhcp::PerfPkt4::writeValueAt ( size_t dest_pos, T val )

inline

Replace contents of buffer with value.

Function replaces part of buffer with value.

Parameters

dest_pos	position in buffer where value is to be written.
val	value to be written.

Definition at line 119 of file perf_pkt4.h.

References isc::dhcp::Pkt::data_.

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

• perf_pkt4.h
• perf_pkt4.cc