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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 will sort out queries that ask for the 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):
    • adaway
    • => infrequent updates, approx. 400 entries (enabled by default)
    • blacklist
    • => static local blacklist, located by default in '/etc/adblock/adblock.blacklist'
    • disconnect
    • => numerous updates on the same day, approx. 6.500 entries (enabled by default)
    • dshield
    • => daily updates, approx. 4.500 entries
    • feodotracker
    • => daily updates, approx. 0-10 entries
    • malwaredomains
    • => daily updates, approx. 16.000 entries
    • malwaredomainlist
    • => daily updates, approx. 1.500 entries
    • openphish
    • => numerous updates on the same day, approx. 1.800 entries
    • palevo tracker
    • => daily updates, approx. 15 entries
    • ransomware tracker
    • => daily updates, approx. 150 entries
    • rolist/easylist
    • => weekly updates, approx. 600 entries
    • ruadlist/easylist
    • => weekly updates, approx. 2.000 entries
    • shallalist (categories "adv" "costtraps" "spyware" "tracker" "warez" enabled by default)
    • => daily updates, approx. 32.000 entries (a short description of all shallalist categories can be found online)
    • spam404
    • => infrequent updates, approx. 5.000 entries
    • sysctl/cameleon
    • => weekly updates, approx. 21.000 entries
    • whocares
    • => weekly updates, approx. 12.000 entries
    • winhelp
    • => infrequent updates, approx. 15.000 entries
    • winspy
    • => infrequent updates, approx. 120 entries
    • yoyo
    • => weekly updates, approx. 2.500 entries (enabled by default)
    • zeus tracker
    • => daily updates, approx. 440 entries
  • zero-conf like automatic installation & setup, usually no manual changes needed (i.e. ip address, network devices etc.)
  • supports a wide range of router modes, as long as the firewall and the DNS server are enabled
  • full IPv4 and IPv6 support
  • each blocklist source will be updated and processed separately
  • timestamp check to download and process only updated adblock list sources
  • overall duplicate removal in separate adblock lists (will be automatically disabled on low memory systems)
  • adblock source list parsing by fast & flexible regex rulesets
  • additional whitelist for manual overrides, located by default in /etc/adblock/adblock.whitelist
  • quality checks during & after update of adblock lists to ensure a reliable dnsmasq service
  • basic adblock statistics via iptables packet counters
  • list states, (overall) list counts & last update time will be stored in uci config
  • status & error logging to stdout and syslog
  • use a dynamic uhttpd instance as an adblock pixel server
  • use dynamic iptables rulesets for adblock related redirects/rejects
  • openwrt init system support (start/stop/restart/reload)
  • hotplug support, the adblock start will be triggered by wan 'ifup' event
  • optional: adblock list backup/restore (disabled by default)
  • optional: add new adblock sources via uci config (see example below)

Prerequisites

  • openwrt, tested with latest stable release (Chaos Calmer) and with current trunk (Designated Driver)
  • usual openwrt setup with enabled 'iptables', 'dnsmasq' and 'uhttpd' - dump AP modes are not supported!
  • additional required software packages:
    • wget
    • optional: 'kmod-ipt-nat6' for IPv6 support
  • the above dependencies and requirements will be checked during package installation & script runtime

Designated Driver Installation & Usage

  • install 'adblock' (opkg install adblock)
  • adblock starts automatically during boot/wan-ifup event, check logread -e "adblock" for adblock related information
  • optional: start/restart/stop the adblock service manually with /etc/init.d/adblock
  • optional: enable/disable your required adblock list sources in /etc/config/adblock - 'adaway', 'disconnect' and 'yoyo' are enabled by default
  • optional: maintain the adblock service in luci under 'System => Startup'

LuCI adblock companion package

  • for easy management of the various blocklist sources and adblock options there is also a nice & efficient LuCI frontend available
  • install 'luci-app-adblock' (opkg install luci-app-adblock)
  • the application is located in LuCI under 'Services' menu
  • Thanks to Hannu Nyman for this great adblock LuCI frontend!

Chaos Calmer installation notes

  • 'adblock' and 'luci-app-adblock' are not available as .ipk packages in the Chaos Calmer download repository
  • download both packages from a development snapshot package directory:
    • for 'adblock' look here
    • for 'luci-app-adblock' look here
  • manually transfer the packages to your routers temp directory (with tools like sshfs or winscp)
  • install the packages with opkg install <...> as described above

Tweaks

  • to process & store all blocklist sources at once it might helpful to enlarge your temp directory with a swap partition => see openwrt wiki for further details
  • add domain white- or blacklist entries to always-allow or -deny certain (sub) domains, by default both lists are located in /etc/adblock. Please add one domain per line - ip addresses, wildcards & regex are not allowed (see example below)
  • enable the backup/restore feature, to restore automatically the latest stable backup of your adblock lists in case of any (partial) processing error (i.e. a single blocklist source is down). Please use an (external) solid partition and not your volatile router temp directory for this
  • for a scheduled call of the adblock service via /etc/init.d/adblock start add an appropriate crontab entry (see example below)
  • in case of any script runtime errors, you should enable script debugging: for this please change the 'DEBUG' variable in the header of /usr/bin/adblock-update.sh from '0' to '1' and start this script afterwards (without any parameter)
  • you could add new blocklist sources on your own via uci config, all you need is a source url and an awk one-liner (see example below)

Further adblock config options

  • usually the adblock autodetection works quite well and no manual config overrides are needed, all options apply to the 'global' config section:
    • adb_enabled => main switch to enable/disable adblock service (default: '1', enabled)
    • adb_cfgversion => config version string (do not change!) - adblock will check this entry during startup
    • adb_lanif => name of the logical lan interface (default: 'lan')
    • adb_nullport => port of the adblock uhttpd instance (default: '65535')
    • adb_nullipv4 => IPv4 blackhole ip address (default: '192.0.2.1')
    • adb_nullipv6 => IPv6 blackhole ip address (default: '::ffff:c000:0201')
    • adb_forcedns => redirect all DNS queries to local dnsmasq resolver (default: '1', enabled)

Examples

example cronjob for a regular update of the block lists:


# configuration found in /etc/crontabs/root
# start adblock script once a day at 6 a.m.
#
0 06 * * *    /etc/init.d/adblock start

example blacklist entry (/etc/adblock/adblock.blacklist):


ads.example.com

This rule blocks:
http://ads.example.com/foo.gif
http://server1.ads.example.com/foo.gif
https://ads.example.com:8000/

This rule doesn't block:
http://ads.example.com.ua/foo.gif
http://example.com/

example whitelist entry (/etc/adblock/adblock.whitelist):


analytics.com

This rule removes all domains from the blocklists with this string in it, i.e.:
google-analytics.com
ssl.google-analytics.com
api.gameanalytics.com
photos.daily-deals.analoganalytics.com
adblockanalytics.com

example to add a new blocklist sources:


1. the easy way ...
example: https://easylist-downloads.adblockplus.org/rolist+easylist.txt
adblock already supports an easylist source, called 'ruadlist'. To add the additional local easylist
as a new source, copy the existing config source 'ruadlist' section and change only 
the source name, the url and the description - that's all!

config source 'rolist'
  option enabled '0'
  option adb_src 'https://easylist-downloads.adblockplus.org/rolist+easylist.txt'
  option adb_src_rset '{FS=\"[|^]\"} \$0 ~/^\|\|([A-Za-z0-9_-]+\.){1,}[A-Za-z]+\^$/{print tolower(\$3)}'
  option adb_src_desc 'focus on romanian ad related domains plus generic easylist additions, weekly updates, approx. 600 entries'

2. a bit harder ...
to add a really new source with different domain/host format you have to write a suitable
awk one-liner on your own, so basic awk skills are needed. As a starting point check the already
existing awk strings (adb_src_rset) in adblock config, maybe you need only small changes for your individual list.
Download the desired list and test your new awk string locally with:
  cat new.list | awk 'fs__individual search__search core__result'
  'fs' => field separator (optional)
  'individual search' => individual search part to filter out needless list information
  'search core' => always '([A-Za-z0-9_-]+\.){1,}[A-Za-z]+', this is part of all list sources and should be unchanged
  'result' => always '{print tolower(\$n)}', only the output column 'n' may vary
the output result should be a sequential list with one domain/host per line - nothing more.

If your awk one-liner works quite well, add a new source section in adblock config and test your new source

Background

This adblock package is a dns/dnsmasq based adblock solution for openwrt.
Queries to ad/abuse domains are never forwarded and always replied with a local IP address which may be IPv4 or IPv6.
For that purpose adblock uses an ip address from the private 'TEST-NET-1' subnet (192.0.2.1 / ::ffff:c000:0201) by default.
Furthermore all ad/abuse queries will be filtered by ip(6)tables and redirected to internal adblock pixel server (in PREROUTING chain) or rejected (in FORWARD or OUTPUT chain).
All iptables and uhttpd related adblock additions are non-destructive, no hard-coded changes in 'firewall.user', 'uhttpd' config or any other openwrt related config files. There is no adblock background daemon running, the (scheduled) start of the adblock service keeps only the adblock lists up-to-date.

Support

Please join the adblock discussion in this openwrt forum thread or contact me by mail openwrt@brenken.org

Removal

  • stop all adblock related services with /etc/init.d/adblock stop
  • optional: remove the adblock package (opkg remove adblock)

Have fun!
Dirk