Make redirects to localhost via /etc/hosts more interesting

sudo socat TCP4-LISTEN:80,bind=127.0.0.1,fork EXEC:'echo "HTTP/1.1 503 Service Unavailable";'
Normally when a site is blocked through /etc/hosts, traffic is just being redirected to a non-existent server that isn't going to respond. This helps get your point across a little more clearly than a browser timeout. Of course you could use any number of codes: http://en.wikipedia.org/wiki/List_of_HTTP_status_codes Obviously, this command can be added to init-rc.d, and more sophisticated responses can be given. Seems noteworthy to mention that the information sent from the browser can be parsed using the bash READ builtin (such as 'while read -t 1 statement; do parsing'), and the connection stays open until the script exits. Take care that you must use EXEC:'bash -c foo.sh', as 'execvp' (socat's method for executing scripts) invokes 'sh', not 'bash'.
Sample Output
$ lynx 127.0.0.1:81
Making HTTP connection to 127.0.0.1:81
Sending HTTP request.
HTTP request sent; waiting for response.
Alert!: HTTP/1.1 503 Service Unavailable;
Data transfer complete

9
By: adelie42
2011-05-02 19:31:56

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