From 379759d539f61cfbf89e9ad7f78e4d8b0b82badc Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Tue, 23 Sep 2014 05:23:06 +0000
Subject: [PATCH] Avoid __pairs metamethod in stdnse.keys

This allows stdnse.keys to be used in a __pairs metamethod to, for
instance, yield keys in sorted order. Using next() bypasses the __pairs
metamethod that would be called when pairs() was used. Otherwise,
infinite recursion was possible.
---
 nselib/stdnse.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nselib/stdnse.lua b/nselib/stdnse.lua
index 6e586595b..c4e146380 100644
--- a/nselib/stdnse.lua
+++ b/nselib/stdnse.lua
@@ -1416,8 +1416,10 @@ end
 -- @return A table of keys
 function keys(t)
   local ret = {}
-  for k, _ in pairs(t) do
+  local k, v = next(t)
+  while k do
     ret[#ret+1] = k
+    k, v = next(t, k)
   end
   return ret
 end