ddwrt-adblocker's Introduction

ddwrt-adblocker

Blocks ads on router level using DD-WRT

based on discussions found on this forum thread: https://www.dd-wrt.com/forum/viewtopic.php?t=313987

Why this?

The simple answer: I have a cheap TP-Link TL-WR841ND router with no jffs, no USB port and limited (volatile) storage. This method:

works even after rebooting
keeps an up-to-date block list
has limited overhead
works on my cheap router

Other alternatives are the pixelserv method and using jffs to store the host list.

Usage

Copy the startup code below to your Administration -> Commands and Save Startup. This will create a custom script to download a blacklist and add the domains to the dnsmasq.
In Services -> Services -> Enable DNSMasq
In Setup -> Basic Setup -> Enable Forced DNS Redirection
To enable weekly updates, in Administration -> Management -> Cron -> Additional Cron Jobs add:

0 11 * * 3 root /tmp/custom.sh

Startup code

# wait for the rest of the services to startup
sleep 20 

# Create script to download blacklist
echo '#!/bin/sh

logger Starting blockads scripts

# clean up old list
rm /tmp/adhosts

# get new list
wget -qO- http://sbc.io/hosts/hosts | grep "^0.0.0.0" > /tmp/adhosts;
 
# restart service
killall dnsmasq
dnsmasq -u root -g root --conf-file=/tmp/dnsmasq.conf

logger Finished executing blockads script' >> /tmp/custom.sh;

# add executable right 
chmod +x /tmp/custom.sh

# add blacklist to dnsmasq
grep "addn-hosts=/tmp/adhosts" /tmp/dnsmasq.conf || echo "addn-hosts=/tmp/adhosts" >> /tmp/dnsmasq.conf;

# execute script
/tmp/custom.sh

Notes

Tested with Firmware: DD-WRT v3.0-r45767 std (02/17/21) on a TP-Link TL-WR841ND v10
The script print to Syslog. Enable it in Services -> Syslog to see if the scripts started. Alternatively Telnet into the router and check if /tmp/custom.sh exists.

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