From 0fa89e6a22c699d1bb3133e8cc998fa981d1daf6 Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Fri, 17 May 2013 14:53:51 +0100
Subject: util.ip: Add 'private' method/property to determine whether an IP
 address is generally expected to be internet-routeable (YMMV)

---
 util/ip.lua | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/util/ip.lua b/util/ip.lua
index 9e668d1b..6ebc023b 100644
--- a/util/ip.lua
+++ b/util/ip.lua
@@ -193,5 +193,20 @@ function ip_methods:scope()
 	return value;
 end
 
+function ip_methods:private()
+	local private = self.scope ~= 0xE;
+	if not private and self.proto == "IPv4" then
+		local ip = self.addr;
+		local fields = {};
+		ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
+		if fields[1] == 127 or fields[1] == 10 or (fields[1] == 192 and fields[2] == 168)
+		or (fields[1] == 172 and (fields[2] >= 16 or fields[2] <= 32)) then
+			private = true;
+		end
+	end
+	self.private = private;
+	return private;
+end
+
 return {new_ip = new_ip,
 	commonPrefixLength = commonPrefixLength};
-- 
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