anticensority/runet-censorship-bypass
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# Антизапрет PAC-скрипт
# Anti-Censorship Solution based on PAC-Script
## Censorship in Russia vs. Right of Being Crazy w/ Information
Censorship in Russia plagues the Freedoms of
[Information](https://en.wikipedia.org/wiki/Freedom_of_information) and [Speech](https://en.wikipedia.org/wiki/Freedom_of_speech),
slowly building analogue of [China Golden Shield](https://en.wikipedia.org/wiki/Golden_Shield_Project).
For good or bad, it blocks
[Main Kampf](https://en.wikipedia.org/wiki/Mein_Kampf),
[lolicon](https://en.wikipedia.org/wiki/Lolicon) (rearly distinguishing from hentai) and
[critics of Putin](http://www.reuters.com/article/2014/03/13/us-russia-internet-idUSBREA2C21L20140313).
Looking at how Russian government [distorts TV](https://therussianreader.wordpress.com/2015/11/22/russian-truckers-strike-dagestan/) and blocks Internet, I decided to write an Anti-Censorship extension for Chomium.
I believe the freedom of information is a virtue and that everyone can go insane with all the sites on the Internets.
## Task Technical Formulation
You have a list of blocked domains.
Per each outcoming request you have to check whether host is a subdomain of the blocked domains.
If host is blocked, you have serve it via proxy.
[PAC (proxy auto-config)](https://en.wikipedia.org/wiki/Proxy_auto-config) is executed on each request.
If it returns `PROXY address` to the browser then proxy is used, otherwise it returns `DIRECT`.
## `Is_subdomain_of( host, blocked_hosts )`
You have check `host belongs to subdomains of the blocked hosts` very fast.
This check is executed on each request. You should watch memeory consumption also.
The naive solution is to keep array of blocked ips and check if the host resolves to one of the ips.
You may do it with `indexOf`, binary search, etc.
The shortcoming of every ip solution is that some providers resolve blocked hosts to wrong ips, so we eventually need list of hosts.
![Host Lookup Chart: Time-Memory, Hits-Misses](./chart/host-lookup-chart.png)