From f4cb387adc12f3d19e01d251b0417ac5cdfcd78b Mon Sep 17 00:00:00 2001
From: onefang
Date: Tue, 18 Oct 2022 10:39:36 +1000
Subject: Work around broken DNS by trying again @9.9.9.11.

---
 apt-panopticon.lua | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/apt-panopticon.lua b/apt-panopticon.lua
index bf9d9a7..93eca85 100755
--- a/apt-panopticon.lua
+++ b/apt-panopticon.lua
@@ -173,7 +173,8 @@ local repoExists = function (r)
 end
 
 local IP = {}
-gatherIPs = function (host)
+gatherIPs = function (host, again)
+    if nil == again then again = '' end
     if nil == IP[host] then
         local IPs
         -- Takes about 30 seconds to look up the lot.
@@ -188,10 +189,24 @@ gatherIPs = function (host)
 		IP[k][v] = t
 		D("  DNS record " .. host .. " == " .. k .. " type " .. t .. " -> " .. v)
 		if t == "CNAME" then
-		    gatherIPs(v)
-		    IP[k][v] = IP[v]
+		    if "" == v then
+			if '' ~= again then
+			    print("Empty host name!  DNS record " .. host .. " == " .. k .. " type " .. t .. " -> " .. v)
+			else
+			    return gatherIPs(host, '@9.9.9.11')
+			end
+		    else
+			gatherIPs(v)
+			IP[k][v] = IP[v]
+		    end
 		elseif v == "SRV" then
 		    print("SVR record found, now what do we do?")
+		elseif "" == v then
+		    if '' ~= again then
+			print("Empty host name!  DNS record " .. host .. " == " .. k .. " type " .. t .. " -> " .. v)
+		    else
+			return gatherIPs(host, '@9.9.9.11')
+		    end
 		end
 	    end
 	end
@@ -201,6 +216,9 @@ gatherIPs = function (host)
     if host == APT.options.roundRobin.value then
 	for k, m in pairs(APT.mirrors) do
 	    if ("yes" == m.DNSRR) or ("maybe" == m.DNSRR) then
+		if "" == m.FQDN then
+		    print("Empty FQDN name! " .. host)
+		end
 		gatherIPs(m.FQDN)
 		IP[host][m.FQDN] = IP[m.FQDN]
 		-- Strip them out so we don't test them twice.
@@ -778,6 +796,7 @@ local parsePackages = function(host)
 			local Pp, e = io.open('results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages.parsed', "w+")
 			if nil == Pp then W('opening results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages.parsed' .. ' file - ' .. e) else
 			    local pp = {}
+-- TODO - FIX - check if this file exists first.
 			    for l in io.lines('results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages') do
 				if "Package: "	== l:sub(1, 9) then
 				    if 0 ~= #pp then
@@ -1090,7 +1109,12 @@ if 0 < #arg then
     I("Starting tests for " .. arg[1] .. " with these tests - " .. table.concat(APT.options.tests.value, ", "))
     APT.mirrors = loadfile("results/mirrors.lua")()
     APT.results = APT.padResults(APT.results)
-    if APT.origin or APT.redir then APT.results["IPs"] = gatherIPs(pu.host) end
+    if APT.origin or APT.redir then
+	if "" == pu.host then
+	    print("Empty pu.host name! " .. pu.host)
+	end
+	APT.results["IPs"] = gatherIPs(pu.host)
+    end
     if nil ~= arg[2] then I(" &nbsp; Using IP " .. arg[2]); ip = arg[2] end
     if nil ~= arg[3] then I(" &nbsp; Using file " .. arg[3]); end
 
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