Fix #25: Save mrouted.genid in /var/lib instead of /run

Saving in /var/lib means we could inspect the genid across reboots if
the system preserves /var/lib.  The /run is always cleared on reboot.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

configure.ac

@@ -95,6 +95,7 @@ cat <<EOF
   prefix................: $prefix
   sysconfdir............: `eval echo $sysconfdir`
   runstatedir...........: `eval echo $runstatedir`
+  localstatedir.........: `eval echo $localstatedir`
   C Compiler............: $CC $CFLAGS $CPPFLAGS $LDFLAGS $LIBS
 
 Optional features:

man/mrouted.8

@@ -408,10 +408,10 @@ writes its process ID to
 .Pa /var/run/mrouted.pid
 when it has completed its start up and is ready to receive signals.
 .Sh FILES
-.Bl -tag -width /var/run/mrouted.genid -compact
+.Bl -tag -width /var/lib/mrouted.genid -compact
 .It Pa /etc/mrouted.conf
 Main configuration file.
-.It Pa /var/run/mrouted.genid
+.It Pa /var/lib/mrouted.genid
 DVMRP generation ID.  Used by neighboring DVRMP routers to detect when a
 router is restarted.
 .It Pa /var/run/mrouted.pid

src/Makefile.am

@@ -6,7 +6,7 @@ AUTOMAKE_OPTIONS = subdir-objects
 #               In GLIBC >= v2.20 this is replaced with -D_DEFAULT_SOURCE,
 #               but to build on older GLIBC systems we now need both ...
 AM_CPPFLAGS      = -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_GNU_SOURCE -I$(top_srcdir)/include
-AM_CPPFLAGS     += -DSYSCONFDIR=\"@sysconfdir@\" -DRUNSTATEDIR=\"@runstatedir@\"
+AM_CPPFLAGS     += -DSYSCONFDIR=\"@sysconfdir@\" -DRUNSTATEDIR=\"@runstatedir@\" -DPRESERVEDIR=\"@localstatedir@/lib\"
 if LINUX
 AM_CPPFLAGS     += -DIOCTL_OK_ON_RAW_SOCKET
 endif

src/pathnames.h

@@ -12,7 +12,7 @@
 #include <paths.h>
 
 #define _PATH_MROUTED_CONF	SYSCONFDIR   "/mrouted.conf"
-#define _PATH_MROUTED_GENID	RUNSTATEDIR  "/mrouted.genid"
+#define _PATH_MROUTED_GENID	PRESERVEDIR  "/mrouted.genid"
 #define _PATH_MROUTED_SOCK	RUNSTATEDIR  "/mrouted.sock"
 
 #endif /* MROUTED_PATHNAMES_H_ */