Added dns::nsupdate class to be used for ddns updates.

dns/manifests/init.pp

@@ -68,3 +68,46 @@ class dns::server {
     }
 
 }
+
+
+# Install dynamic DNS update script
+#
+# === Global variables
+#
+#   $dns_nsupdate_name:
+#       FQDN to update into DNS.
+#
+#   $dns_nsupdate_key:
+#       DNS key to use when updating entry. Usually in format:
+#         <keyname> <secret>
+#       for example:
+#         gw1.example.com. sZ6GgTZLBX83LXCoo
+#
+#   $dns_nsupdate_server:
+#       DNS server address where to update entry.
+#
+#   $dns_nsupdate_zone:
+#       Zone name to update. Defaults to domain part of
+#       $dns_nsupdate_name variable.
+#
+class dns::nsupdate {
+
+    file { "/usr/local/sbin/nsupdate.sh":
+        ensure  => present,
+        content => template("dns/nsupdate.sh.erb"),
+        mode    => 0700,
+        owner   => root,
+        group   => $operatingsystem ? {
+            openbsd => wheel,
+            default => root,
+        },
+    }
+
+    cron { "nsupdate":
+        ensure  => present,
+        command => "/usr/local/sbin/nsupdate.sh",
+        minute  => "*/5",
+        require => File["/usr/local/sbin/nsupdate.sh"],
+    }
+      
+}

dns/templates/nsupdate.sh.erb

@@ -0,0 +1,49 @@
+#!/bin/sh
+
+DNSSERVER="<%= dns_nsupdate_server -%>"
+DNSZONE="<% if defined?(dns_nsupdate_zone) -%><%= dns_nsupdate_zone -%><% end %>"
+MYNAME="<%= dns_nsupdate_name -%>"
+MYKEY="<%= dns_nsupdate_key -%>"
+
+# if zone is not defined take it from fqdn
+if [ "${DNSZONE}" = "" ]; then
+    DNSZONE=`echo ${MYNAME} | cut -d . -f 2-`
+fi
+
+
+# determine our current address
+case `uname` in
+    Linux)
+	MYIF="`route -n | awk '/^0.0.0.0/ { print $8 }'`"
+	MYADDR="`ifconfig ${MYIF} | sed -n '/inet/s/.*addr:\([0-9.]*\).*/\1/p'`"
+	;;
+    OpenBSD)
+	MYADDR="`route -n get default | awk '/if address/ { print $3 }'`"
+	;;
+esac
+
+
+# try to get current addr/name from dns
+CURADDR=`dig +noall +answer @${DNSSERVER} ${MYNAME} A | awk '{ print $5 }'`
+if [ $? -ne 0 ]; then
+    # we should get this only in dns errors so exit quietly
+    exit 1
+fi
+
+
+# exit now if we are up to date
+if [ ${CURADDR} = ${MYADDR} ]; then
+    exit 0
+fi
+
+
+# update record
+nsupdate -v <<EOF
+server ${DNSSERVER}
+zone ${DNSZONE}
+key ${MYKEY}
+update delete ${MYNAME}
+update add ${MYNAME} 60 A ${MYADDR}
+show
+send
+EOF