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README.md: minor improvements

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Slightly improved the description and build instructions, added required library package name on RPM-based distributions like Fedora/Red Hat.
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Lenz Grimmer 2022-08-22 16:38:34 +00:00 committed by GitHub
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@ -1,26 +1,35 @@
# googerteller # googerteller
audible feedback on just how much your browsing feeds into google
Audible feedback on just how much your browsing feeds into Google.
By bert@hubertnet.nl / https://berthub.eu/ By bert@hubertnet.nl / https://berthub.eu/
## How to compile ## How to compile
First install libpcaudio (libpcaudio-dev), then:
You need a C++ compiler like `gcc-c++` and CMake for compiling the binary.
You also need to install `libpcaudio` (`libpcaudio-dev` on Debian/Ubuntu, `pcaudiolib-devel` on Fedora/Red Hat).
Then run:
``` ```
cmake . cmake .
make make
``` ```
## How to run: ## How to run
``` ```
sudo tcpdump -n -l dst net 192.0.2.1/32 $(for a in $(cat goog-prefixes.txt); do echo or dst net $a; done) | ./teller sudo tcpdump -n -l dst net 192.0.2.1/32 $(for a in $(cat goog-prefixes.txt); do echo or dst net $a; done) | ./teller
``` ```
Replace `192.0.2.1` with the IP address of your default gateway (e.g. your Internet router).
And then cry. And then cry.
## Problems ## Problems
If tcpdump complains about `Warning: Kernel filter failed: Cannot allocate memory`, try
If `tcpdump` complains about `Warning: Kernel filter failed: Cannot allocate memory`, try
this first: this first:
``` ```
@ -28,6 +37,7 @@ sudo sysctl net.core.optmem_max=204800
``` ```
## Data source ## Data source
The list of Google services IP addresses can be found on [this Google The list of Google services IP addresses can be found on [this Google
support page](https://support.google.com/a/answer/10026322?hl=en). support page](https://support.google.com/a/answer/10026322?hl=en).