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I am building a basic captive portal script, with support for idle timeout. I managed to create iptables rules on authentication in the browser.

However, I'm not sure how to detect users that are active, and users that are idle for a certain amount of time. e.g When a user is not active for 30 minutes, he needs to be logged out.

What could be a good way to know if a user is idle?

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You can check out the inactivity time (idle time) with command w -hfs along with a bunch of other info.

  • This command shows the activity of users logged in on the local system, however captive portals don't use local logins. A user is just connected by the network. – Christophe B. Jan 2 '12 at 11:23

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