Curl will try IPv4 as a backup if IPv6 fails, and we don't want that.

Tell it not to.

Also detect if IPv6 is even available.

2 files changed, 13 insertions, 3 deletions

diff --git a/apt-panopticommon.lua b/apt-panopticommon.lua
index e40ec0a..7664297 100644
--- a/apt-panopticommon.lua
+++ b/apt-panopticommon.lua
@@ -23,6 +23,7 @@ APT.verbosity = -1
 APT.origin = false
 APT.redir = false
 APT.keep = false
+APT.IPv46 = ''
 
 APT.options =
 {
@@ -119,6 +120,10 @@ APT.parseArgs = function(args)
     APT.args = args
     local arg = {}
     local sendArgs = ""
+    -- A special test to disable IPv6 tests if IPv6 isn't available.
+    if 1 == APT.exe('ip -6 addr | grep inet6 | grep " global"'):Do().status then
+        table.insert(args, '--tests=-IPv6')
+    end
     if 0 ~= #(args) then
         local option = ""
         for i, a in pairs(args) do
@@ -132,6 +137,9 @@ APT.parseArgs = function(args)
             elseif "-q" == a then
                 APT.verbosity = -1
                 sendArgs = sendArgs .. a .. " "
+            elseif ("-4" == a) or ("-6" == a) then
+                APT.IPv46 = a
+                sendArgs = sendArgs .. a .. " "
             elseif "-k" == a then
                 APT.keep = true
                 sendArgs = sendArgs .. a .. " "
diff --git a/apt-panopticon.lua b/apt-panopticon.lua
index aa089b1..057fc40 100755
--- a/apt-panopticon.lua
+++ b/apt-panopticon.lua
@@ -265,6 +265,7 @@ checkHEAD = function (host, URL, r, retry, sanity)
         -header "" - add extra headers.
         -L - DO follow redirects.
         --max-redirs n - set maximum redirects, default is 50, -1 = unlimited.
+        -4 or -6 - Only use IPv4 or IPv6
         --retry n - maximum retries, default is 0, no retries.
         -o file - write to file instead of stdout.
         --path-as-is - https://curl.haxx.se/libcurl/c/CURLOPT_PATH_AS_IS.html might be useful for URLSanity.
@@ -274,7 +275,7 @@ checkHEAD = function (host, URL, r, retry, sanity)
         -D file - write the received headers to a file.  This includes the status code and string.
     ]]
     local status = APT.exe(
-        'curl -I --retry 0 -s --path-as-is --connect-timeout ' .. APT.options.timeout.value .. ' --max-redirs 0 ' ..
+        'curl -I --retry 0 -s --path-as-is --connect-timeout ' .. APT.options.timeout.value .. ' --max-redirs 0 ' .. APT.IPv46 .. ' ' ..
         IP .. ' ' .. '-o /dev/null -D results/"HEADERS_' .. fname .. '" ' ..
         hdr .. ' -w "#%{http_code} %{ssl_verify_result} %{url_effective}\\n" ' .. PU.scheme .. '://' .. host .. PU.path .. ' >>results/"STATUS_' .. fname .. '"'
     ):Nice():log():Do().status
@@ -519,6 +520,7 @@ local download = "curl" ..
                  " --create-dirs -f -L" ..
                  " --fail-early" ..
                  " --max-time " .. APT.options.maxtime.value ..
+                 APT.IPv46 .. ' ' ..
                  " --retry " .. APT.options.retries.value ..
                  " -R -v -z 'results/stamp.old'  --stderr results/"
 local downloads = function(host, URL, meta, release, list)
@@ -1025,9 +1027,9 @@ if 0 < #arg then
             APT.allpairs(ips,
                 function(k, v)
                     if v == "A" then
-                        if APT.testing("IPv4") then APT.exe("./apt-panopticon.lua " .. sendArgs .. " " .. pu.host .. path .. " " .. k .. " " .. file):Nice():log():fork() end
+                        if APT.testing("IPv4") then APT.exe('./apt-panopticon.lua ' .. sendArgs .. ' -4 ' .. pu.host .. path .. ' ' .. k .. ' ' .. file):Nice():log():fork() end
                     elseif v == "AAAA" then
-                        if APT.testing("IPv6") then APT.exe("./apt-panopticon.lua " .. sendArgs .. " " .. pu.host .. path .. " " .. k .. " " .. file):Nice():log():fork() end
+                        if APT.testing("IPv6") then APT.exe('./apt-panopticon.lua ' .. sendArgs .. ' -6 ' .. APT.IPv46 .. ' ' .. pu.host .. path .. ' ' .. k .. ' ' .. file):Nice():log():fork() end
                     end
                     D('logging to ' .. APT.logName(pu.host, k, file)[2])
                 end