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I know about SelfControl app, but it has to be started everytime and the block hours to be set.

I want for example to forbid loading certain sites during work hours, but make it possible during the rest. I want to set it once and forget. It has to do the switch automatically everyday.

What would be the easier way to do this, considering that i'm a super newbie.

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I would recommend you looking at something like Dansguardian:

http://dansguardian.org/

The documentation is quite good and there some resources on time based browsing restrictions.

  • Thanks, that will do but it kinda looks like a overkill for my super simple needs. Infact i need to block just 1-2 sites from 9 to 5 that's it :) – user240891 Jan 31 '14 at 17:19
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We'll use a combination of Iptables, Bash Scripting and Cron to achieve this.

Iptables

Iptables command to block a domain looks like this:

iptables -I INPUT -p tcp --dport 80 -m string --string "Host: yourdomain.com" --algo bm -j DROP

Similarly, unblock command looks like:

iptables -I INPUT -p tcp --dport 80 -m string --string "Host: yourdomain.com" --algo bm -j ACCEPT

Bash Scripts

Make a file, say, block.sh, in which you define Iptables rules to block outgoing connections the domains you want to block, and a reverse script to unblock them.

#! /usr/bin/env bash
iptables -I INPUT -p tcp --dport 80 -m string --string "Host: yourdomain.com" --algo bm -j DROP
# other stuff you want to do when you block a domain
# add blocking commands for each domain here

Run chmod +x block.sh to make the script executable. Now you can run it as /path/to/file/block.sh.

Thus, you'll have two scripts like:

  1. /path/to/block.sh
  2. /path/to/unblock.sh

Cron

Now, add a crontab entry to run your scripts like this:

Run crontab-e. In first run, it'll ask you to configure a text editor. Use nano, if you are not sure.

Add these lines to the end of the file:

0 9 * * * /path/to/block.sh
0 17 * * * /path/to/unblock.sh

Save the file with CTRL+O, press ENTER and then, CTRL+X to exit.

Now, at 9 am everyday, the first script will block all the domains, and at 5 pm, the second script will unblock them back.

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