Support for systemd

[jariq]

IPwatchD 1.2.1 released back in 2011 was designed with "System V" init system in mind. As of 2018, the majority of Linux distributions (including Debian, Ubuntu, Fedora, CentOS and RHEL) have adopted systemd as their default init system so adapting IPwatchD to systemd seems to be inevitable.

Fedora package already includes following patch which adds basic systemd support:

diff -uNr ipwatchd-1.2.1/src/daemonize.c ipwatchd-1.2.1-systemd/src/daemonize.c
--- ipwatchd-1.2.1/src/daemonize.c	2011-07-24 16:39:03.000000000 +0200
+++ ipwatchd-1.2.1-systemd/src/daemonize.c	2013-10-09 14:17:19.381133164 +0200
@@ -41,12 +41,13 @@
 		return (IPWD_RV_ERROR);
 	}
 
-	/* If parent of this process is init we are already in daemon mode */
-	if (getppid () == 1)
-	{
-		ipwd_message (IPWD_MSG_TYPE_INFO, "Already running as daemon");
-		return (IPWD_RV_SUCCESS);
-	}
+	// Commented out so systemd can treat ipwatchd as "forking" service
+	///* If parent of this process is init we are already in daemon mode */
+	//if (getppid () == 1)
+	//{
+	//	ipwd_message (IPWD_MSG_TYPE_INFO, "Already running as daemon");
+	//	return (IPWD_RV_SUCCESS);
+	//}
 
 	/* Fork child process */
 	pid_t pid = fork ();
diff -uNr ipwatchd-1.2.1/src/ipwatchd.service ipwatchd-1.2.1-systemd/src/ipwatchd.service
--- ipwatchd-1.2.1/src/ipwatchd.service	1970-01-01 01:00:00.000000000 +0100
+++ ipwatchd-1.2.1-systemd/src/ipwatchd.service	2013-10-09 14:17:41.919028973 +0200
@@ -0,0 +1,10 @@
+[Unit]
+Description=IP conflict detection daemon
+After=syslog.target network.target
+
+[Service]
+Type=forking
+ExecStart=/usr/sbin/ipwatchd -c /etc/ipwatchd.conf
+
+[Install]
+WantedBy=multi-user.target
diff -uNr ipwatchd-1.2.1/src/Makefile ipwatchd-1.2.1-systemd/src/Makefile
--- ipwatchd-1.2.1/src/Makefile	2011-07-24 16:39:03.000000000 +0200
+++ ipwatchd-1.2.1-systemd/src/Makefile	2013-10-09 14:12:29.492616767 +0200
@@ -43,14 +43,15 @@
 
 
 install:
-	mkdir -p $(DESTDIR)/etc/init.d
+	mkdir -p $(DESTDIR)/etc
+	mkdir -p $(DESTDIR)/usr/lib/systemd/system
 	mkdir -p $(DESTDIR)/usr/sbin
 	mkdir -p $(DESTDIR)/usr/share/man/man8
 	mkdir -p $(DESTDIR)/usr/share/man/man5
 	mkdir -p $(DESTDIR)/usr/share/man/man1
 	cp ipwatchd $(DESTDIR)/usr/sbin
 	cp scripts/ipwatchd-script $(DESTDIR)/usr/sbin
-	cp scripts/ipwatchd $(DESTDIR)/etc/init.d
+	cp ipwatchd.service $(DESTDIR)/usr/lib/systemd/system/
 	cp ipwatchd.conf $(DESTDIR)/etc
 	cp ../doc/ipwatchd.8.gz $(DESTDIR)/usr/share/man/man8
 	cp ../doc/ipwatchd.conf.5.gz $(DESTDIR)/usr/share/man/man5
@@ -59,7 +60,7 @@
 uninstall:
 	rm $(DESTDIR)/usr/sbin/ipwatchd
 	rm $(DESTDIR)/usr/sbin/ipwatchd-script
-	rm $(DESTDIR)/etc/init.d/ipwatchd
+	rm $(DESTDIR)/usr/lib/systemd/system/ipwatchd.service
 	rm $(DESTDIR)/etc/ipwatchd.conf
 	rm $(DESTDIR)/usr/share/man/man8/ipwatchd.8.gz
 	rm $(DESTDIR)/usr/share/man/man5/ipwatchd.conf.5.gz

[jariq]

Relevant systemd documentation: daemon, systemd.service