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openwrt-packages-dist/net/adblock/files/README.md

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adblock script for openwrt

Description

A lot of people already use adblocker plugins within their desktop browsers,
but what if you are using your (smart) phone, tablet, watch or any other wlan gadget...
...getting rid of annoying ads, trackers and other abuse sites (like facebook ;-) is simple: block them with your router.

When the dns server on your router receives dns requests, you’ll sort out queries that ask for the [A] resource records of ad servers and return the local ip address of your router and the internal web server delivers a transparent pixel instead.

Main Features

  • support of the following domain blocklist sources (free for private usage, for commercial use please check their individual licenses):
  • each blocklist source will be updated and processed separately
  • timestamp check to download and process only updated blocklists
  • overall duplicate removal in separate blocklists (will be automatically disabled on low memory systems)
  • blocklist parsing by fast & flexible regex rulesets
  • additional white- and blacklist support for manual overrides
  • use of dynamic adblock network interface
  • use of dynamic uhttpd instance as pixel server
  • use of quality checks after adblocklist updates to ensure a reliable dnsmasq service
  • optional features (disabled by default):
    • powerful adblock list backup/restore handling
    • wan interface check, useful for rc.local based autostart and (mobile) multiwan setups to update only on pre-defined wan interfaces
    • domain query logging as a background service to easily identify free and already blocked domains (see example output below)
    • adblock statistics (req. query logging)
    • ntp time sync
    • status & error logging to separate file (req. ntp time sync)

Prerequisites

  • openwrt (tested only with trunk > r47025), CC should also work
  • additional software packages:
    • curl
    • wget (due to an openwrt bug still needed for certain https requests - see ticket #19621)
    • optional: busybox find with -mtime support for logfile housekeeping (enabled by default with r47362, will be disabled if not found)
  • the above dependencies and requirements will be checked during package installation & script startup, please check console output or logread -e "adblock" for errors

Usage

  • select & install adblock package (opkg install adblock)
  • configure /etc/config/adblock to your needs, see additional comments in adblock.conf.sample
  • at least configure the ip address of the local adblock interface/uhttpd instance, it needs to be a different subnet from the normal LAN
  • recommendation: there is no need to enable all blacklist sites at once, for normal use one to three lists should be sufficient
  • recommendation: to handle all blacklists at once add an usb stick or any other storage device to supersize your /tmp directory with a swap partition
  • => see openwrt wiki for further details
  • add additional domain white- or blacklist entries, one domain per line (wildcards & regex are not allowed!), both lists are located in /etc/adblock
  • by default openwrts main uhttpd instance is bind to all ports of your router,
  • for a working adblock setup you have to bind uhttpd to the standard LAN port only, please change listen_http accordingly
  • start /usr/bin/adblock-update.sh and check console output or logread -e "adblock" for errors

Distributed samples

  • all sample configuration files stored in /etc/adblock/samples
  • to enable/disable additional domain query logging set the dnsmasq option logqueries accordingly, see dhcp.config.sample
  • to bind uhttpd to standard LAN port only, see uhttpd.config.sample
  • for rc.local based autostart and /tmp resizing on the fly see rc.local.sample
  • for scheduled call of adblock-update.sh see root.crontab.sample
  • to redirect/force all dns queries to your router see firwall.user.sample
  • for further dnsmasq tweaks see dnsmasq.conf.sample

Examples

adblock log file excerpt:

adblock[11780] info : domain adblock processing started (0.40.1, r47929, 20.12.2015 21:59:56)  
adblock[11780] info : backup/restore will be disabled  
adblock[11780] info : wan update check will be disabled  
adblock[11780] info : get ntp time sync (192.168.254.254), after 0 loops  
adblock[11780] info : source doesn't change, no update required (whocares)  
adblock[11780] info : adblocklists with overall 11619 domains loaded, backups disabled  
adblock[11780] info : adblock statistics for query date 20151220 (total: 2495, blocked: 154)  
adblock[11780] info : domain adblock processing finished (0.40.1, r47929, 20.12.2015 22:00:03)

domain blocklist for dnsmasq (disconnect.me after overall duplicate removal):

address=/0000mps.webpreview.dsl.net/192.168.2.1  
address=/0001.2waky.com/192.168.2.1  
address=/001wen.com/192.168.2.1  
address=/002it.com/192.168.2.1  
address=/00game.net/192.168.2.1  
[...]  
address=/zzsgssxh.com/192.168.2.1  
address=/zzshw.net/192.168.2.1  
address=/zztxdown.com/192.168.2.1  
address=/zzxcws.com/192.168.2.1  
#------------------------------------------------------------------  
# adblock-update.sh (0.40.0) - 3710 ad/abuse domains blocked  
# source: https://s3.amazonaws.com/lists.disconnect.me/simple_malvertising.txt  
# last modified: Thu, 17 Dec 2015 09:21:17 GMT

domain query log excerpt:

query[A] www.seenby.de from fe80::6257:18ff:fe6b:4667  
query[A] tarifrechner.heise.de from 192.168.1.131  
query[A] www.mittelstandswiki.de from fe80::6257:18ff:fe6b:4667  
query[A] ad.doubleclick.net from 192.168.1.131  
ad.doubleclick.net is 192.168.2.1

The first three queries are OK (not blocked), the last one has been blocked and answered by local dnsmasq instance.

Have fun!
Dirk