2018-05-13 20:32:29 -04:00
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Android needs to be able to determine if there is a captive portal on the network or if a network has Internet connectivity at all
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To do so it polls a server on every connection and also periodically
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This is a privacy issue.
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There are multiple solutions:
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- Use the default Google gen204 endpoint
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- Google is not the most privacy friendly
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- Disable the checks
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- Would confuse users when behind a captive portal
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+ Would potentially save a small amount of battery
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- Use our own gen204 endpoint
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- Not everyone will trust us (even if they're running our code)
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- Randomly choose between many different endpoints
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- We'd need permission
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+ Would be the best
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+ Would limit one actor from knowing all
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- If a maintainer wants us to stop using theirs it'd take a while since not everyone updates instantly
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- If a maintainer blocked it, it'd cause issues (no Internet symbol when there is)
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List of known connectivity check endpoints
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2019-05-23 11:34:26 -04:00
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+ DivestOS - 204 - http://divestos.org/gen204.php
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2018-05-13 20:32:29 -04:00
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- Google - 204 - https://www.google.com/generate_204
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- Google - 204 - http://connectivitycheck.gstatic.com/generate_204
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- Google - 204 - http://www.google.com/gen_204
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- Google - 204 - http://play.googleapis.com/generate_204
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+ openSUSE - 204 - http://conncheck.opensuse.org
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+ Ubuntu - 204 - http://connectivity-check.ubuntu.com
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Non 204
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- Apple - Success - http://captive.apple.com
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+ Arch - 404 - http://www.archlinux.org/check_network_status.txt
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+ Fedora - OK - http://fedoraproject.org/static/hotspot.txt
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+ Gnome - "NetworkManager is online" - http://nmcheck.gnome.org/check_network_status.txt
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+ Mozilla - success - http://detectportal.firefox.com/success.txt
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2019-04-03 19:04:37 -04:00
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export DOS_CONNECTIVITY_CHECK_HTTP="http://connectivitycheck.gstatic.com/generate_204"; #Options: Any endpoint that returns HTTP 204 repsonse
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export DOS_CONNECTIVITY_CHECK_HTTPS="https://www.google.com/generate_204";
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export DOS_CONNECTIVITY_CHECK_FALLBACK="http://www.google.com/gen_204";
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export DOS_CONNECTIVITY_CHECK_FALLBACK_ALT="http://play.googleapis.com/generate_204";
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export DOS_CONNECTIVITY_CHECK_USERAGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.32 Safari/537.36";
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