########################################

#

# Macros for switching between source policy

# and loadable policy module support

#

##############################

#

# For adding the module statement

#

define(`policy_module',`

	ifdef(`self_contained_policy',`',`

		module $1 $2;

		require {

			role system_r;

			all_kernel_class_perms

		}

	')

')

##############################

#

# For use in interfaces, to optionally insert a require block

#

define(`gen_require',`

	ifdef(`self_contained_policy',`

		ifdef(`__in_optional_policy',`

			require {

				$1

			} # end require

		')

	',`

		require {

			$1

		} # end require

	')

')

# helper function, since m4 wont expand macros

# if a line is a comment (#):

define(`policy_m4_comment',`

##### $2 depth: $1

')dnl

##############################

#

# In the future interfaces should be in loadable modules

#

# template(name,rules)

#

define(`template',` dnl

	ifdef(`$1',`errprint(__file__:__line__`: duplicate definition of $1(). Original definition on '$1. __endline__) define(`__if_error')',`define(`$1',__line__)') dnl

	`define(`$1',` dnl

	define(`policy_temp',incr(policy_call_depth)) dnl

	pushdef(`policy_call_depth',policy_temp) dnl

	undefine(`policy_temp') dnl

	policy_m4_comment(policy_call_depth,begin `$1'(dollarsstar)) dnl

	$2 dnl

	define(`policy_temp',decr(policy_call_depth)) dnl

	pushdef(`policy_call_depth',policy_temp) dnl

	undefine(`policy_temp') dnl

	policy_m4_comment(policy_call_depth,end `$1'(dollarsstar)) dnl

	'')

')

##############################

#

# In the future interfaces should be in loadable modules

#

# interface(name,rules)

#

define(`interface',` dnl

	ifdef(`$1',`errprint(__file__:__line__`: duplicate definition of $1(). Original definition on '$1. __endline__) define(`__if_error')',`define(`$1',__line__)') dnl

	`define(`$1',` dnl

	define(`policy_temp',incr(policy_call_depth)) dnl

	pushdef(`policy_call_depth',policy_temp) dnl

	undefine(`policy_temp') dnl

	policy_m4_comment(policy_call_depth,begin `$1'(dollarsstar)) dnl

	$2

	define(`policy_temp',decr(policy_call_depth)) dnl

	pushdef(`policy_call_depth',policy_temp) dnl

	undefine(`policy_temp') dnl

	policy_m4_comment(policy_call_depth,end `$1'(dollarsstar)) dnl

	'')

')

define(`policy_call_depth',0)

##############################

#

# Optional policy handling

#

define(`optional_policy',`

	ifelse(regexp(`$1',`\W'),`-1',`

		errprint(__file__:__line__`: deprecated use of module name ($1) as first parameter of optional_policy() block.' __endline__)

		optional {

			pushdef(`__in_optional_policy') dnl

			$2

			popdef(`__in_optional_policy') dnl

		ifelse(`$3',`',`',`

		} else {

			$3

		')

		}

	',`

		optional {

			pushdef(`__in_optional_policy') dnl

			$1

			popdef(`__in_optional_policy') dnl

		ifelse(`$2',`',`',`

		} else {

			$2

		')

		}

	')

')

##############################

#

# Determine if we should use the default

# tunable value as specified by the policy

# or if the override value should be used

#

define(`dflt_or_overr',`ifdef(`$1',$1,$2)')

##############################

#

# Extract booleans out of an expression.

# This needs to be reworked so expressions

# with parentheses can work.

define(`delcare_required_symbols',`

ifelse(regexp($1, `\w'), -1, `', `dnl

bool regexp($1, `\(\w+\)', `\1');

delcare_required_symbols(regexp($1, `\w+\(.*\)', `\1'))dnl

') dnl

')

##############################

#

# Tunable declaration

#

define(`gen_tunable',`

	ifdef(`self_contained_policy',`

		bool $1 dflt_or_overr(`$1'_conf,$2);

	',`

		# loadable module tunable

		# declaration will go here

		# instead of bool when

		# loadable modules support

		# tunables

		bool $1 dflt_or_overr(`$1'_conf,$2);

	')

')

##############################

#

# Tunable policy handling

#

define(`tunable_policy',`

	ifdef(`self_contained_policy',`

		if (`$1') {

			$2

		ifelse(`$3',`',`',`

		} else {

			$3

		')

		}

	',`

		# structure for tunables

		# will go here instead of a

		# conditional when loadable

		# modules support tunables

		gen_require(`

			delcare_required_symbols(`$1')

		')

		if (`$1') {

			$2

		ifelse(`$3',`',`',`

		} else {

			$3

		')

		}

	')

')