adblock

AdBlockPlus parser, matcher and transparent HTTP/HTTPS proxy

Package documentation can be found at:

http://godoc.org/github.com/pmezard/adblock/adblock

adstop

adstop is an ad-blocking transparent HTTP/HTTPS proxy.

It was designed to run on low power, low memory ARM devices and serve a couple of clients, mostly old smartphones which cannot run adblockers themselves.

Before using it, you have to configure your devices and network to make it accessible as a transparent proxy. One way to achieve this is to install a VPN on the server side and redirect all HTTP/HTTPS traffic to the proxy with routing rules. Then make the client browse through the VPN.

HTTPS filtering requires the proxy to intercept the device traffic and decrypt it. To allow this, you have to generate a certificate and add it to your device.

$ adstop -http localhost:1080 \
	-https localhost:1081     \
	-cache .adstop			  \
	-max-age 24h			  \
	-ca-cert /path/to/ca.cert \
	-ca-key /path/to/ca.key   \
	https://easylist-downloads.adblockplus.org/easylist.txt \
	some_local_list.txt

starts the proxy and makes it listen on HTTP on port 1080, HTTPS on port 1081, fetch and load rules from easylist and a local file, cache easylist in an .adstop/ directory and refresh it every 24 hours.

How does it work?

adstop monitors HTTP/HTTPS requests and responses and if one of these matches a filter, it returns a 404 error to the client. It does not modify response bodies. Rules without options or which options are not based on returned data are applied on requests, the others on responses.

The difficult part is to apply Adblock rules. They were designed to operate in a web browser and were assumed to have access to a lot more of information than a simple web proxy has. adstop supports only a subset of available rules:

Rules without options ("$..." suffix) are completely supported
The following options are supported:
- domain=foo.com|bar.com|~baz.com
- font, image, objects, script, stylesheet are roughly approximated using Content-Type.
- thirdparty is approximated with the Referrer header.
The following options are not-supported, and related rules are discared:
- document
- media
- popup
Element hiding rules are ignored.
Other options are ignored and rules applied without them.

License

pmezard/adblock

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