add custom function which returns all ipaddresses as an array

lib/puppet/parser/functions/ipaddresses.rb

@@ -0,0 +1,40 @@
+module Puppet::Parser::Functions
+    newfunction(:ipaddresses, :type => :rvalue, :doc => <<-EOS
+Returns all ip addresses of network interfaces (except lo) found by facter.
+EOS
+    ) do |args|
+        interfaces = lookupvar('interfaces')
+
+        return false if (interfaces == :undefined)
+
+        result = []
+        if interfaces.count(',') > 0
+            interfaces = interfaces.split(',')
+            interfaces.each do |iface|
+                if ! iface.include?('lo')
+                    ipaddr = lookupvar("ipaddress_#{iface}")
+                    ipaddr6 = lookupvar("ipaddress6_#{iface}")
+                    if ipaddr
+                        result << ipaddr
+                    end
+                    if ipaddr6
+                        result << ipaddr6
+                    end
+                end
+            end
+        else
+            if ! interfaces.include?('lo')
+                ipaddr = lookupvar("ipaddress_#{interfaces}")
+                ipaddr6 = lookupvar("ipaddress6_#{interfaces}")
+                if ipaddr
+                    result << ipaddr
+                end
+                if ipaddr6
+                    result << ipaddr6
+                end
+            end
+        end
+
+        return result
+    end
+end