Applied Fabian Affolter's patch to make generator entry more generic

scripts/http-generator.nse

@@ -4,7 +4,8 @@ local stdnse = require "stdnse"
 local string = require "string"
 
 description = [[
-Displays the contents of the "generator" meta tag of a web page (default: /) if there is one.
+Displays the contents of the "generator" meta tag of a web page (default: /) 
+if there is one.
 ]]
 
 author = "Michael Kohl"
@@ -42,12 +43,10 @@ categories = {"default", "discovery", "safe"}
 --   + improve redirect pattern
 --   + update documentation
 --   + add changelog
+-- 2014-07-29 Fabian Affolter <fabian@affolter-engineering.ch>:
+--   + update generator pattern
 
--- TODO:
--- more generic generator pattern
-
-
--- helper function
+-- Helper function
 local follow_redirects = function(host, port, path, n)
   local pattern = "^[hH][tT][tT][pP]/1.[01] 30[12]"
   local response = http.get(host, port, path)
@@ -69,9 +68,9 @@ action = function(host, port)
   local redirects = tonumber(stdnse.get_script_args('http-generator.redirects')) or 3
 
   -- Worst case: <meta name=Generator content="Microsoft Word 11">
-  local pattern = '<meta name="?generator"? content="([^\"]*)" ?/?>'
+  local pattern = '<meta name=[\"\']?generator[\"\']? content=[\"\']([^\"\']*)[\"\'] ?/?>'
 
-  -- make pattern case-insensitive
+  -- Make pattern case-insensitive
   pattern = pattern:gsub("%a", function (c)
       return string.format("[%s%s]", string.lower(c),
         string.upper(c))