Defines lease4_select and lease4_renew callout functions. More...

#include <config.h>
#include <cc/command_interpreter.h>
#include <cc/data.h>
#include <cc/simple_parser.h>
#include <dhcpsrv/cfgmgr.h>
#include <dhcpsrv/cfg_subnets4.h>
#include <dhcpsrv/cfg_subnets6.h>
#include <dhcpsrv/subnet.h>
#include <hooks/callout_manager.h>
#include <hooks/hooks.h>
#include <util/str.h>
#include <legal_log_log.h>
#include <dhcpsrv/legal_log_mgr_factory.h>
#include <subnets_user_context.h>
#include <sstream>
#include <unordered_set>

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Functions
void	addContext (ostringstream &os, ConstElementPtr &arguments)
	Outputs text describing lease optional user context to a stream.

void	addDuration (CalloutHandle &handle, ostringstream &os, ConstElementPtr &arguments)
	Outputs text describing lease duration to a stream.

bool	checkLoggingEnabledSubnet4 (ConstElementPtr &arguments)
	Check if command has optional subnet-id parameter and if it does, check that the respective subnet has logging enabled.

bool	checkLoggingEnabledSubnet6 (ConstElementPtr &arguments)
	Check if command has optional subnet-id parameter and if it does, check that the respective subnet has logging enabled.

int	command_processed (CalloutHandle &handle)
	This callout is called at the "command_processed" hook point.

bool	getOptionalInt (ConstElementPtr &arguments, const string &name, int64_t &value)
	Fetch value for a integer element if it is an element scope.

bool	getOptionalString (ConstElementPtr &arguments, const string &name, string &value)
	Fetch value for a string element if it is an element scope.

int	handleLease4Cmds (CalloutHandle &handle, string &name, ConstElementPtr &arguments, ConstElementPtr &)
	Handle lease4 related commands.

int	handleLease6Cmds (CalloutHandle &handle, string &name, ConstElementPtr &arguments, ConstElementPtr &response)
	Handle lease6 related commands.

bool	isPrefix (ConstElementPtr arguments)
	Returns true if an element scope describes a prefix delegation.

Detailed Description

Defines lease4_select and lease4_renew callout functions.

Definition in file command_callouts.cc.

Function Documentation

◆ addContext()

void addContext	(	ostringstream &	os,
		ConstElementPtr &	arguments )

Outputs text describing lease optional user context to a stream.

Looks for an user context or a comment and display it

Parameters

os	output stream to which the text is output
arguments	element scope which may contain user context or comment

Definition at line 138 of file command_callouts.cc.

References isc::data::copy(), and Element::createMap().

Referenced by handleLease4Cmds(), and handleLease6Cmds().

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◆ addDuration()

void addDuration	(	CalloutHandle &	handle,
		ostringstream &	os,
		ConstElementPtr &	arguments )

Outputs text describing lease duration to a stream.

Looks for either a lease valid lifetime or expiry from which to generate the duration text using isc::dhcp::LegalLogMgr::genDurationString().

Parameters

handle	CalloutHandle which provides access to context.
os	output stream to which the text is output
arguments	element scope which may contain duration values

Definition at line 117 of file command_callouts.cc.

References isc::dhcp::LegalLogMgr::genDurationString(), isc::hooks::CalloutHandle::getCurrentLibrary(), getOptionalInt(), and isc::dhcp::LegalLogMgrFactory::instance().

Referenced by handleLease4Cmds(), and handleLease6Cmds().

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◆ checkLoggingEnabledSubnet4()

bool checkLoggingEnabledSubnet4 ( ConstElementPtr & arguments )

Check if command has optional subnet-id parameter and if it does, check that the respective subnet has logging enabled.

Parameters

arguments The command arguments.

Returns: true if logging is enabled (default), false otherwise.

Definition at line 163 of file command_callouts.cc.

References isc::dhcp::CfgMgr::getCurrentCfg(), getOptionalInt(), isc::dhcp::CfgMgr::instance(), and isc::legal_log::isLoggingDisabled().

Referenced by handleLease4Cmds().

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◆ checkLoggingEnabledSubnet6()

bool checkLoggingEnabledSubnet6 ( ConstElementPtr & arguments )

Check if command has optional subnet-id parameter and if it does, check that the respective subnet has logging enabled.

Parameters

arguments The command arguments.

Returns: true if logging is enabled (default), false otherwise.

Definition at line 264 of file command_callouts.cc.

References isc::dhcp::CfgMgr::getCurrentCfg(), getOptionalInt(), isc::dhcp::CfgMgr::instance(), and isc::legal_log::isLoggingDisabled().

Referenced by handleLease6Cmds().

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◆ command_processed()

int command_processed ( CalloutHandle & handle )

This callout is called at the "command_processed" hook point.

Generates an entry in the legal log for the given control channel command.

It is possible to disable logging for selected subnets by specifying a "legal-logging" boolean parameter within the subnet's user context. If this parameter is not specified it defaults to 'true', in which case the logging is performed. When this value is set to 'false' the log is not produced and the function returns.

Parameters

handle CalloutHandle which provides access to context.

Returns: 0 upon success, non-zero otherwise.

Definition at line 485 of file command_callouts.cc.

References isc::hooks::CalloutHandle::getArgument(), isc::hooks::CalloutHandle::getCurrentLibrary(), isc::data::SimpleParser::getInteger(), handleLease4Cmds(), handleLease6Cmds(), isc::dhcp::LegalLogMgrFactory::instance(), LEGAL_LOG_COMMAND_NO_LEGAL_STORE, LEGAL_LOG_COMMAND_WRITE_ERROR, isc::legal_log::legal_log_logger, and LOG_ERROR.

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◆ getOptionalInt()

bool getOptionalInt	(	ConstElementPtr &	arguments,
		const string &	name,
		int64_t &	value )

Fetch value for a integer element if it is an element scope.

Exception safe fetcher which looks for an integer element with the given name within an given element scope. Rather than throw if the element is not found, it returns true if found, false if not.

Parameters

	arguments	element scope to search, assumed to be a map
	name	name of the desired element
[out]	value	reference to an integer in which the found value is returned. Will be set to 0 if the element is not found.

Returns: true if the element was found, false if not

Definition at line 78 of file command_callouts.cc.

References isc::data::SimpleParser::getInteger().

Referenced by addDuration(), checkLoggingEnabledSubnet4(), and checkLoggingEnabledSubnet6().

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◆ getOptionalString()

bool getOptionalString	(	ConstElementPtr &	arguments,
		const string &	name,
		string &	value )

Fetch value for a string element if it is an element scope.

Exception safe fetcher which looks for a string element with the given name within an given element scope. Rather than throw if the element is not found, it returns true if found, false if not.

Parameters

	arguments	element scope to search, assumed to be a map
	name	name of the desired element
[out]	value	reference to a string in which the found value is returned. Will be set to "" if the element is not found.