# helper tools
AWK ?= gawk
INSTALL ?= install
M4 ?= m4
SED ?= sed
EINFO ?= echo
PYTHON ?= python

NAME ?= $(shell $(AWK) -F= '/^SELINUXTYPE/{ print $$2 }' /etc/selinux/config)
SHAREDIR ?= /usr/share/selinux
HEADERDIR ?= $(SHAREDIR)/$(NAME)/include

include $(HEADERDIR)/build.conf

# executables
PREFIX := /usr
BINDIR := $(PREFIX)/bin
SBINDIR := $(PREFIX)/sbin
CHECKMODULE := $(BINDIR)/checkmodule
SEMODULE := $(SBINDIR)/semodule
SEMOD_PKG := $(BINDIR)/semodule_package
XMLLINT := $(BINDIR)/xmllint

# set default build options if missing
TYPE ?= strict
DIRECT_INITRC ?= n
POLY ?= n
QUIET ?= y

genxml := $(PYTHON) $(HEADERDIR)/support/segenxml.py

docs = doc
polxml = $(docs)/policy.xml
xmldtd = $(HEADERDIR)/support/policy.dtd
layerxml = metadata.xml

globaltun = $(HEADERDIR)/global_tunables.xml
globalbool = $(HEADERDIR)/global_booleans.xml

# compile strict policy if requested.
ifneq ($(findstring strict,$(TYPE)),)
	M4PARAM += -D strict_policy
endif

# compile targeted policy if requested.
ifneq ($(findstring targeted,$(TYPE)),)
	M4PARAM += -D targeted_policy
endif

# enable MLS if requested.
ifneq ($(findstring -mls,$(TYPE)),)
	M4PARAM += -D enable_mls
	CHECKPOLICY += -M
	CHECKMODULE += -M
endif

# enable MLS if MCS requested.
ifneq ($(findstring -mcs,$(TYPE)),)
	M4PARAM += -D enable_mcs
	CHECKPOLICY += -M
	CHECKMODULE += -M
endif

# enable distribution-specific policy
ifneq ($(DISTRO),)
	M4PARAM += -D distro_$(DISTRO)
endif

# enable polyinstantiation
ifeq ($(POLY),y)
	M4PARAM += -D enable_polyinstantiation
endif

ifeq ($(DIRECT_INITRC),y)
	M4PARAM += -D direct_sysadm_daemon
endif

# default MLS/MCS sensitivity and category settings.
MLS_SENS ?= 16
MLS_CATS ?= 256
MCS_CATS ?= 256

ifeq ($(QUIET),y)
	verbose := @
endif

M4PARAM += -D hide_broken_symptoms -D mls_num_sens=$(MLS_SENS) -D mls_num_cats=$(MLS_CATS) -D mcs_num_cats=$(MCS_CATS)

# policy headers
m4support = $(wildcard $(HEADERDIR)/support/*.spt)
all_layers = $(filter-out $(HEADERDIR)/support,$(shell find $(wildcard $(HEADERDIR)/*) -maxdepth 0 -type d))
all_interfaces = $(foreach layer,$(all_layers),$(wildcard $(layer)/*.if))
rolemap = $(HEADERDIR)/rolemap

detected_layers =  $(filter-out CVS tmp $(docs),$(shell find $(wildcard *) -maxdepth 0 -type d))
3rd_party_mods = $(wildcard *.te)
detected_mods = $(3rd_party_mods) $(foreach layer,$(detected_layers),$(wildcard $(layer)/*.te))
detected_ifs = $(detected_mods:.te=.if)
detected_fcs = $(detected_mods:.te=.fc)
all_packages = $(notdir $(detected_mods:.te=.pp))

vpath %.te $(detected_layers)
vpath %.if $(detected_layers)
vpath %.fc $(detected_layers)

# if there are modules in the current directory, add them into the third party layer
ifneq "$(3rd_party_mods)" ""
        genxml += -3 .
endif

########################################
#
# Functions
#

# parse-rolemap-compat modulename,outputfile
define parse-rolemap-compat
	$(verbose) $(M4) $(M4PARAM) $(rolemap) | \
		$(AWK) '/^[[:blank:]]*[A-Za-z]/{ print "gen_require(type " $$3 "; role " $$1 ";)\n$1_per_userdomain_template(" $$2 "," $$3 "," $$1 ")" }' >> $2
endef

# parse-rolemap modulename,outputfile
define parse-rolemap
	$(verbose) $(M4) $(M4PARAM) $(rolemap) | \
		$(AWK) '/^[[:blank:]]*[A-Za-z]/{ print "gen_require(type " $$3 "; role " $$1 ";)\n$1_per_role_template(" $$2 "," $$3 "," $$1 ")" }' >> $2
endef

# peruser-expansion modulename,outputfile
define peruser-expansion
	$(verbose) echo "ifdef(\`""$1""_per_role_template',\`" > $2
	$(call parse-rolemap,$1,$2)
	$(verbose) echo "')" >> $2

	$(verbose) echo "ifdef(\`""$1""_per_userdomain_template',\`" >> $2
	$(verbose) echo "errprint(\`Warning: per_userdomain_templates have been renamed to per_role_templates (""$1""_per_userdomain_template)'__endline__)" >> $2
	$(call parse-rolemap-compat,$1,$2)
	$(verbose) echo "')" >> $2
endef

.PHONY: clean all xml load
.SUFFIXES:
.SUFFIXES: .pp
# broken in make 3.81:
#.SECONDARY:

########################################
#
# Main targets
#

all: $(all_packages)

xml: $(polxml)

########################################
#
# Load module packages
#

load: tmp/loaded

tmp/loaded reload: $(all_packages)
	@$(EINFO) "Loading $(NAME) modules: $(basename $(notdir $(all_packages)))"
	$(verbose) $(SEMODULE) $(foreach mod,$^,-i $(mod))
	@mkdir -p tmp
	@touch tmp/loaded

########################################
#
# Build module packages
#
tmp/%.mod: $(m4support) tmp/all_interfaces.conf %.te
	@$(EINFO) "Compiling $(NAME) $(basename $(@F)) module"
	@test -d tmp || mkdir -p tmp
	$(call peruser-expansion,$(basename $(@F)),$@.role)
	$(verbose) $(M4) $(M4PARAM) -s $^ $@.role > $(@:.mod=.tmp)
	$(verbose) $(CHECKMODULE) -m $(@:.mod=.tmp) -o $@

tmp/%.mod.fc: $(m4support) %.fc
	$(verbose) $(M4) $(M4PARAM) $^ > $@

%.pp: tmp/%.mod tmp/%.mod.fc
	@echo "Creating $(NAME) $(@F) policy package"
	$(verbose) $(SEMOD_PKG) -o $@ -m $< -f $<.fc

tmp/all_interfaces.conf: $(m4support) $(all_interfaces) $(detected_ifs)
	@test -d tmp || mkdir -p tmp
	$(verbose) m4 $^ | sed -e s/dollarsstar/\$$\*/g > $@

# so users dont have to make empty .fc and .if files
$(detected_ifs) $(detected_fcs):
	@touch $@

########################################
#
# Documentation generation
#

# minimal dependencies here, because we don't want to rebuild
# this and its dependents every time the dependencies
# change.  Also use all .if files here, rather then just the
# enabled modules.
$(polxml): $(detected_ifs) $(foreach dir,$(all_layers),$(dir)/$(layerxml))
	@echo "Creating $@"
	@mkdir -p doc
	$(verbose) echo '<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>' > $@
	$(verbose) echo '<!DOCTYPE policy SYSTEM "$(xmldtd)">' >> $@
	$(verbose) $(genxml) -m $(layerxml) --tunables-xml $(globaltun) --booleans-xml $(globalbool) $(all_layers) $(detected_layers) >> $@
	$(verbose) if test -x $(XMLLINT) && test -f $(xmldtd); then \
		$(XMLLINT) --noout --dtdvalid $(xmldtd) $@ ;\
	fi

########################################
#
# Clean the environment
#

clean:
	rm -fR tmp
	rm -f *.pp