Added port autodiscovery for avahi services.

avahi/plugins/puppet/parser/functions/avahi_service_port.rb

@@ -0,0 +1,26 @@
+
+module Puppet::Parser::Functions
+    newfunction(:avahi_service_port, :type => :rvalue) do |args|
+
+	type, name, proto =  /^_([^\.]*)\._([^\.]*)$/.match(args[0]).to_a
+
+	port = nil
+
+	File.open('/etc/services', 'r') do |fd|
+	    while (line = fd.gets)
+		begin
+		    port = /^#{name}[ \t]+(\d+)\/#{proto}.*/.match(line)[1]
+		    break
+		rescue
+		    nil
+		end
+	    end
+	end
+
+	if not port
+	    raise Puppet::ParseError, 'Failed to get port for service %s' % type
+	end
+	port
+
+    end
+end