74 lines
2.0 KiB
Markdown
74 lines
2.0 KiB
Markdown
# googerteller
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Audible feedback on just how much your browsing feeds into Google.
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By bert@hubertnet.nl / https://berthub.eu/
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Makes a little bit of noise any time your computer sends a packet to a
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Google service, which excludes Google Cloud users.
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Demo video [in this tweet](https://twitter.com/bert_hu_bert/status/1561466204602220544)
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## How to compile
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You need a C++ compiler like `gcc-c++` and CMake for compiling the binary.
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You also need to install `libpcaudio` (`libpcaudio-dev` on Debian/Ubuntu, `pcaudiolib-devel` on Fedora/Red Hat).
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Then run:
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```
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cmake .
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make
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```
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## How to run
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Google is so large its IPv4 and IPv6 footprint can't be handled by tcpdump,
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or at least not efficiently. Therefore we need to define an ip(6)tables
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`ipset`. This will first exclude Google Cloud, and then include all the
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other Google IP addresses.
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Install iptables 'ipset', and run (as root) the `ipset-setup.sh` script, or
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execute:
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```
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ipset create google-services hash:net
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for a in $(cat goog-cloud-prefixes.txt)
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do
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echo $a
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ipset add google-services $a nomatch
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done
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for a in $(cat goog-prefixes.txt)
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do
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ipset add google-services $a
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done
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ipset create google-services6 hash:net family inet6
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for a in $(cat goog-cloud-prefixes6.txt)
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do
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ipset add google-services6 $a nomatch
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done
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for a in $(cat goog-prefixes6.txt)
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do
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ipset add google-services6 $a
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done
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iptables -I OUTPUT -m set --match-set google-services dst -j NFLOG --nflog-group 20
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ip6tables -I OUTPUT -m set --match-set google-services6 dst -j NFLOG --nflog-group 20
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```
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Then start as:
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```
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sudo tcpdump -i nflog:20 -ln | ./teller
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```
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And cry.
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## Data source
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The list of Google services IP addresses can be found on [this Google
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support page](https://support.google.com/a/answer/10026322?hl=en).
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Note that this splits out Google services and Google cloud user IP
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addresses. However, it appears the Google services set includes the cloud IP
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addresses, so you must check both sets before determining something is in
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fact a Google service and not a Google customer.
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