[kwlug-disc] DNS Black Hole server

[Raymond Chen]

When I read a post on the Globe and Mail today, it popped up a layer to
block the content upon detecting ad-blockers. I could only leave or sign in
with subscription account...



On Fri, May 19, 2017 at 7:51 PM, Khalid Baheyeldin <kb at 2bits.com> wrote:

> A couple of years ago, I wanted to implement a network wide ad blocking
> scheme. Since I am using OpenWRT, I came up with the script below, based on
> some recipes online.
>
> The whole idea is to add to dnsmasq a list of domains that are aliased to
> either 0.0.0.0 or 127.0.0.1. You then make the OpenWRT device your only DNS
> server. The script updates the list once a week.
>
> For some reason, I never enabled it. Perhaps because uBlock Origin took
> care of ads on my laptop and my tablet. Or maybe because the list list is
> over 66,500 long and I was concerned that it would slow my router. I don't
> remember.
>
> Maybe someone can find this useful. Please report back if you try it.
>
> #!/bin/sh
>
>
>
> # For OpenWRT,
>
> # Grab and sort a list of adservers and malware hostnames, and block
> them
>
>
> # Install this file in /etc/custom/adblock.sh
>
> # Add it to cron by pasting the following line to System -> Scheduled
> Tasks
> # 0 4 * * 1 sh /etc/adblock.sh
>
> URL_LIST="
>
> pgl.yoyo.org/adservers/serverlist.php?showintro=1;
> hostformat=hosts;mimetype=plaintext
> winhelp2002.mvps.org/hosts.txt
>
> www.malwaredomainlist.com/hostslist/hosts.txt
>
> hosts-file.net/ad_servers.txt "
>
>
>
> BLOCK_LIST=/etc/custom/block.hosts
>
>
>
> TMP_LIST=/tmp/block.list
>
>
> # Check proper DHCP config and, if necessary, update it
> uci get dhcp. at dnsmasq[0].addnhosts > /dev/null 2>&1 ||
>   uci add_list dhcp. at dnsmasq[0].addnhosts=$BLOCK_LIST &&
>   uci commit
>
> CUSTOM_LIST=$(uci get dhcp. at dnsmasq[0].addnhosts)
>
> # Delete the old blocked hosts to make room for the updates
> rm -f $BLOCK_LIST
>
> # Empty the temp file
> > $TMP_LIST
>
> # Download and process the files needed to make the lists
> for URL in "$URL_LIST"
> do
>   wget -qO- "http://$URL" >> $TMP_LIST
> done
>
> # If we have a custom file, then include it too
> if [ -s "$CUSTOM_LIST" ]; then
>   cat $CUSTOM_LIST >> $TMP_LIST
> fi
>
> # Sort the lists, and remove the Microsoft Carriage Return ^M
> sort -u $TMP_LIST |
>   sed -e "s/\r//g" > $BLOCK_LIST
>
> # Delete files used to build list to free up the limited space
> rm -f $TMP_LIST
>
> # Tell dnsmasq to re-read its configuration
> killall -HUP dnsmasq
>
> exit 0
>
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>
>
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