support for systemd

Makefile

 CC      := gcc
-CCFLAGS := -Wall -g
+CCFLAGS := -Wall -O2
 LDFLAGS := -lnetfilter_queue
 
 TARGETS:= dhcp_protect
 OBJ    := dhcp_protect.o $(MAINS)
 DEPS   := dhcp_protect.h
 
-.PHONY: all clean
+.PHONY: all clean install uninstall
+
+help:
+	@echo "make <all|clean|install|uninstall>"
 
 all: $(TARGETS)
 
 clean:
 	rm -f $(TARGETS) $(OBJ)
 
+install:
+	systemctl stop dhcp_protect
+	cp dhcp_protect /usr/local/bin/
+	cp dhcp_protect.conf /usr/local/etc/
+	cp dhcp_protect.service /etc/systemd/system/
+	chmod 644 /etc/systemd/system/dhcp_protect.service
+	systemctl enable dhcp_protect
+	systemctl start dhcp_protect
+
+uninstall:
+	systemctl stop dhcp_protect
+	systemctl disable dhcp_protect
+	rm -f /usr/local/bin/dhcp_protect
+	rm -f /usr/local/etc/dhcp_protect.conf
+	rm -f /etc/systemd/system/dhcp_protect.service
+
+
 $(OBJ): %.o : %.c $(DEPS)
 	$(CC) -c -o $@ $< $(CCFLAGS)
 

dhcp_protect.service

+[Unit]
+Description=DHCP Protect system service.
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/dhcp_protect /usr/local/etc/dhcp_protect.conf
+
+[Install]
+WantedBy=multi-user.target