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-rw-r--r--lib/puppet/parser/functions/is_domain_name.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/is_domain_name.rb b/lib/puppet/parser/functions/is_domain_name.rb
index 2860ded..90ede32 100644
--- a/lib/puppet/parser/functions/is_domain_name.rb
+++ b/lib/puppet/parser/functions/is_domain_name.rb
@@ -33,6 +33,10 @@ Returns true if the string passed to this function is a syntactically correct do
return false if domain.empty?
return false if domain.length > domain_max_length
+ # The top level domain must be alphabetic if there are multiple labels.
+ # See rfc1123, 2.1
+ return false if domain.include? '.' and not /\.[A-Za-z]+$/.match(domain)
+
# Check each label in the domain
labels = domain.split('.')
vlabels = labels.each do |label|