[Zrouter-src] ZRouter.org: push to ZRouter profiles/lua_web_ui/files/etc/www/l...

[zrouter-src at zrouter.org]

details:   http://zrouter.org/hg/zrouter//rev/f533387b0dd6
changeset: 468:f533387b0dd6
user:      Aleksandr Rybalko <ray at ddteam.net>
date:      Mon Sep 24 14:20:43 2012 +0300
description:
Helper to do link test.
Currently implement most correct way:
1. Install route for ISP DNSs to link associated to that ISP.
2. query some domain that well known as Not Existent.
3. a) NX Domain - link works
   b) Serv Fail - ISP have problem with their uplinks.
   c) Timeout - no link to ISP

diffstat:

 profiles/lua_web_ui/files/etc/www/lib/linktest.lua |  75 ++++++++++++++++++++++
 1 files changed, 75 insertions(+), 0 deletions(-)

diffs (79 lines):

diff -r 2b4ab6b5816c -r f533387b0dd6 profiles/lua_web_ui/files/etc/www/lib/linktest.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/profiles/lua_web_ui/files/etc/www/lib/linktest.lua	Mon Sep 24 14:20:43 2012 +0300
@@ -0,0 +1,75 @@
+LinkTest = {};
+mtLinkTest = {};
+
+function LinkTest:new(name)
+    ltest = {};
+
+    ltest.name = name;
+
+    return (setmetatable(ltest, mtLinkTest));
+end
+
+function LinkTest:NXDomainInit()
+	self.dns = require "dns";
+	self.ns = {};
+	self.iface = "wan0"; -- XXX: test only
+--	table.insert(self.ns, "192.168.10.10");
+	table.insert(self.ns, "192.168.10.15");
+
+	function setup_ns_route(ns, iface)
+		local routecmd = string.format(
+		    "/sbin/route add %s -iface %s", ns, iface);
+		print("LinkTest: exec", routecmd);
+		os.execute(routecmd);
+	end
+
+	for i,ns in ipairs(self.ns) do
+		setup_ns_route(ns, self.iface);
+	end
+end
+
+function LinkTest:NXDomain()
+	local function query(dns, server, host)
+		local e = dns.encode {
+  			id       = math.random(),
+  			query    = true,
+  			rd       = true,
+  			opcode   = 'query',
+  			question = {
+  				name  = host,
+  				type  = 'a',
+  				class = 'in'
+  			}
+  		}
+
+		local r,err = dns.query(server, e);
+
+		if r == nil then
+			print("error:",err)
+			return nil
+		end
+
+		return dns.decode(r)
+	end
+	for i,ns in ipairs(self.ns) do
+		local nxhost = os.time() .. "nxdom.com.";
+		print("LinkTest: Ask " .. ns .. " for \"" .. nxhost ..
+		    "\" via " .. self.iface);
+		local result = query(self.dns, ns, nxhost);
+		if (result.rcode == 3) then
+			return (true);
+		end
+	end
+
+	return (false);
+end
+
+mtLinkTest.__index = LinkTest;
+
+--[[
+How to test:
+
+lt = LinkTest:new("test");
+lt:NXDomainInit();
+lt:NXDomain();
+]]