CC      ?= cc

CFLAGS  ?= -O2
CFLAGS  += -Wall -Wextra -Wpedantic
CFLAGS  += -fPIC
CFLAGS  += -fstack-protector-strong
CFLAGS  += -D_FORTIFY_SOURCE=2

LDFLAGS += -Wl,-z,relro,-z,now

PAM_LDLIBS    = -lpam -lm
CREATE_LDLIBS = -lm

PAM_TARGET    = pam_bloom.so
CREATE_TARGET = pam_bloom_create

PREFIX      ?= /usr
BINDIR      ?= $(PREFIX)/bin

MULTIARCH   := $(shell dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null)

ifeq ($(MULTIARCH),)
PAMDIR      ?= $(PREFIX)/lib/security
else
PAMDIR      ?= $(PREFIX)/lib/$(MULTIARCH)/security
endif

FILTERDIR   ?= /etc/security/pam_bloom/filters.d
DESTDIR     ?=

COMMON_OBJS   = bloom.o mmh3.o
PAM_OBJS      = pam_bloom.o $(COMMON_OBJS)
CREATE_OBJS   = pam_bloom_create.o $(COMMON_OBJS)

FILTERS = rockyou.txt.bloom

PAM_CONFIG_DIR ?= /usr/share/pam-configs
PAM_CONFIG     = pam-configs/pam_bloom

.PHONY: all clean install uninstall

all: $(PAM_TARGET) $(CREATE_TARGET)

$(PAM_TARGET): $(PAM_OBJS)
	$(CC) $(LDFLAGS) -shared -o $@ $(PAM_OBJS) $(PAM_LDLIBS)

$(CREATE_TARGET): $(CREATE_OBJS)
	$(CC) $(LDFLAGS) -o $@ $(CREATE_OBJS) $(CREATE_LDLIBS)

pam_bloom.o: pam_bloom.c bloom.h
	$(CC) $(CFLAGS) -c -o $@ $<

pam_bloom_create.o: pam_bloom_create.c bloom.h
	$(CC) $(CFLAGS) -c -o $@ $<

bloom.o: bloom.c bloom.h mmh3.h
	$(CC) $(CFLAGS) -c -o $@ $<

mmh3.o: mmh3.c mmh3.h
	$(CC) $(CFLAGS) -c -o $@ $<

install: all
	install -d "$(DESTDIR)$(BINDIR)"
	install -m 0755 $(CREATE_TARGET) "$(DESTDIR)$(BINDIR)/$(CREATE_TARGET)"

	install -d "$(DESTDIR)$(PAMDIR)"
	install -m 0755 $(PAM_TARGET) "$(DESTDIR)$(PAMDIR)/$(PAM_TARGET)"

	install -d -m 0755 "$(DESTDIR)$(FILTERDIR)"
	install -m 0644 $(FILTERS) "$(DESTDIR)$(FILTERDIR)/"

	install -d "$(DESTDIR)$(PAM_CONFIG_DIR)"
	install -m 0644 $(PAM_CONFIG) \
	    "$(DESTDIR)$(PAM_CONFIG_DIR)/pam_bloom"

uninstall:
	rm -f "$(DESTDIR)$(BINDIR)/$(CREATE_TARGET)"
	rm -f "$(DESTDIR)$(PAMDIR)/$(PAM_TARGET)"
	rm -f "$(DESTDIR)$(PAM_CONFIG_DIR)/pam_bloom"

clean:
	rm -f $(PAM_TARGET) $(CREATE_TARGET) \
	      $(PAM_OBJS) pam_bloom_create.o