Add initial sample config for ifstated. Syntax will change.

ok deraadt@

src/etc/ifstated.conf

@@ -0,0 +1,77 @@
+# $OpenBSD: ifstated.conf,v 1.1 2004/02/04 23:49:36 mcbride Exp $
+# This is a sample config for a pair of firewalls with two interfaces
+#
+# carp0 and carp1 have ip addresses on 192.168.3.0/24 and 192.168.6.0/24
+# respectively. 
+
+# Uncomment one of the following lines to force primary/backup status.
+# init state primary
+# init-state backup
+
+carp_up = "((carp0 link up) and (carp1 link up))"
+carp_down = "((! carp0 link up) and (! carp1 link up))"
+carp_sync = "((carp0 link up and carp1 link up) or \
+    ((!carp0 link up) and (!carp1 link up)))"
+
+# The "net" addresses are other addresses which can be used to determine
+# whether we have connectivity. Make sure the hosts are always up, or 
+# test multiple ip's, 'or'-ing the tests.
+net = '( "ping -q -c 1 -w 1 192.168.6.8 > /dev/null" every 10 and \
+    "ping -q -c 1 -w 1 192.168.3.8 > /dev/null" every 10)'
+
+# The peer addresses below are the real ip addresses of the OTHER firewall
+peer = '( "ping -q -c 1 -w 1 192.168.6.7 > /dev/null" every 10 and \
+    "ping -q -c 1 -w 1 192.168.3.7 > /dev/null" every 10)'
+
+state auto {
+	if $carp_up {
+		set-state primary
+	}
+	if $carp_down {
+		set-state backup
+	}	
+}
+
+state primary {
+	init {
+		run "ifconfig carp0 advskew 10"
+		run "ifconfig carp1 advskew 10"
+	}
+        if ! $net {
+                set-state demoted
+        }
+}
+
+state demoted {
+	init {
+		run "ifconfig carp0 advskew 254"
+		run "ifconfig carp1 advskew 254"
+	}
+        if $net {
+                set-state primary
+        }
+}
+
+state promoted {
+	init {
+		run "ifconfig carp0 advskew 0"
+		run "ifconfig carp1 advskew 0"
+	}
+	if $peer or ! $net {
+		set-state backup
+	}
+}
+
+state backup {
+	init {
+		run "ifconfig carp0 advskew 100"
+		run "ifconfig carp1 advskew 100"
+	}
+	# The "sleep 5" below is a hack to dampen the $carp_sync when we come
+        # out of promoted state. Thinking about the correct fix...
+	if ! $carp_sync and $net and "sleep 5" every 10 {
+		if (! $carp_sync) and $net {
+			set-state promoted
+		}
+	}
+}