There has been confusion in the IRC channel/Internet forums about online check so this addition tries to clarify how ConnMan does portal detection and online check in more detail. --- README | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)
diff --git a/README b/README index 5846b58..b1367dd 100644 --- a/README +++ b/README @@ -353,6 +353,46 @@ network. While the same setup works well for a WiFi or ethernet uplink. +Online check +============ + +ConnMan tries to detect if it has Internet connection or not when +a service is connected. If the online check succeeds the service +enters Online state, if not it stays in Ready state. The online +check is also used to detect whether ConnMan is behind a captive +portal like when you are in hotel and need to pay for connectivity. + +The online check is done by trying to fetch status.html document +from ipv4.connman.net (for IPv4 connectivity) and ipv6.connman.net +(for IPv6 connectivity). The used URL looks like this +http://ipv{4|6}.connman.net/online/status.html + +During the online check procedure, ConnMan will temporarily install +a host route to both the ipv4.connman.net and ipv6.connman.net so that +the online check query can be directed via the correct network +interface which the connected service is using. This host route is +automatically removed when the online check is done. + +ConnMan sends this very minimal information in http header when doing +the online check request (example): + Host: ipv4.connman.net + User-Agent: ConnMan/1.23 wispr + Connection: close + +Currently following information is returned from connman.net if +the connection is successfull (200 OK http response code is returned): + Server: nginx + Date: Mon, 09 Jun 2014 09:25:42 GMT + Content-Type: text/html + Connection: close + X-ConnMan-Status: online + +The X-ConnMan-Status field is used in portal detection, if it is missing +ConnMan will call RequestBrowser method in net.connman.Agent dbus +interface to handle the portal login if the portal does not support WISPr. +See doc/agent-api.txt for more details. + + Information =========== -- 1.8.3.1 _______________________________________________ connman mailing list connman@connman.net https://lists.connman.net/mailman/listinfo/connman
