generate_204 is not accepted by all Android devices.

[MaStr]

Official answer to /generate_204

curl -v http://connectivitycheck.gstatic.com/generate_204

• Trying 2a00:1450:4001:80b::2003...
• TCP_NODELAY set
• Connected to connectivitycheck.gstatic.com (2a00:1450:4001:80b::2003) port 80 (#0) GET /generate_204 HTTP/1.1 Host: connectivitycheck.gstatic.com User-Agent: curl/7.60.0 Accept: /

HTTP/1.1 204 No Content Content-Length: 0 Date: Tue, 17 Jul 2018 18:59:28 GMT

What the conversation looks on PirateBox:

GET /generate_204 HTTP/1.1 User-Agent: Dalvik/2.1.0 (Linux; U; Android 7.0; Moto G (4) Build/NPJS25.93-14.7-8) Host: connectivitycheck.gstatic.com Connection: Keep-Alive Accept-Encoding: gzip

HTTP/1.1 204 No Content X-Powered-By: PHP/7.2.5 Content-type: text/html; charset=UTF-8 Cache-Control: max-age=60, must-revalidate, no-store, no-cache, public Date: Tue, 24 Apr 2018 00:39:16 GMT Server: lighttpd/1.4.49

I guess we need to avoid:

X-Powered-By: PHP/7.2.5 Content-type: text/html; charset=UTF-8 Cache-Control: max-age=60, must-revalidate, no-store, no-cache, public Server: lighttpd/1.4.49

[MaStr]

Ok, I am getting pretty close, but only on the latest lighttpd version.

1. change /etc/php/php.ini expose option to Off

   sudo sed -i -e 's|expose_php = On|expose_php = Off|g' /etc/php/php.ini

2. Change /opt/piratebox/www/generate_204 to:

   <?php
   // Return an empty page to fake a working internet connection for
   // android
   ini_set("expose_php","off");
   header('Content-Type:', true);
   http_response_code(204);
   ?>

3. Change /opt/piratebox/conf/lighttpd/fastcgi-php-generate203.conf to

   $HTTP["url"] =~ "^/generate_204$" {
       fastcgi.server = (
               "" => ((
                               "bin-path" => "/usr/bin/php-cgi",
                               "socket" => "/tmp/php.socket",
                               "max-procs" => 1
                       ))
       )
       setenv.set-response-header  = ( "Content-Length" =>  "0" )
       server.tag =""
       mimetype.use-xattr = "disable"
   }

The result renders "only"

$ curl -i http://127.0.0.1:8001/generate_204
HTTP/1.1 204 No Content
Date: Tue, 17 Jul 2018 19:40:16 GMT