iputils.hh: NetmaskTree: Make the node_type key value const.

This prevents changing the key used by the tree, which would otherwise provide
an opportunity to corrupt the tree.

diff --git a/pdns/iputils.hh b/pdns/iputils.hh
index 69c9a9ec8e15cf528515de0292893d01929641fc..97ef03855f266ea0cfddf5af1f2672fd1ba31474 100644 (file)
--- a/pdns/iputils.hh
+++ b/pdns/iputils.hh
@@ -650,7 +650,7 @@ public:
 
   typedef Netmask key_type;
   typedef T value_type;
-  typedef std::pair<key_type,value_type> node_type;
+  typedef std::pair<const key_type,value_type> node_type;
   typedef size_t size_type;
   typedef class Iterator iterator;