A simple DNS forwarder that only allows hosts from a whitelist to proceed. This currently blocks all domains except those used by netflix/disney+.
Reason for this is the content monitoring and built in ads on my samsung TV.
How it looks
- Pico wireless connection might seem unstable
Ping works on and off (10 seconds yes, 10 seconds no), requests sometimes time out. Avoided on my setup by setting "DTIM Interval", "Delivery Traffic Indication Message Interval" to 1 on my router. This was an issue with micropython, did not check if it's solved or if it even appears on C++ variant, so note might be out of date.
On Windows you can use docker, WSL is also great with 'ubuntu' from store.
- Install pico dependencies
sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi
- Fetch submodules
git submodule update --init --recursive
- Configure wifi in example (otherwise it won't connect):
pico_hole/config/wifi.h
- Compile
from main folder:
mkdir build
cd build
cmake ..
make
for release build use this instead of cmake ..
cmake -DCMAKE_BUILD_TYPE=Release ../
- Simple one line to always connect when pico starts up:
while true; do minicom -b 115200 -o -D /dev/ttyACM0; done
2.2. If you want udp logs
pico_hole/config/lwipopts_common.h
#define LWIP_DEBUG 1
#define UDP_DEBUG LWIP_DBG_ON
Bootup raspberry pi pico in bootsel mode and mount it. Copy 'build/pico_hole/pico_hole.uf2' to it. Start it up and let it connect to local wifi.
Inside your router you should configure:
-
Static IP address for the pico AND the TV (should be under DHCP).
-
Firewall rules so all DNS traffic from TV is dropped except for target Pico.
The smart TV bypasses configured DNS server if it cannot connect and fetch ads. To prevent that from happening which would defeat this.
Example rules on openwrt -> Network -> Firewall:
In example above (replace with your own):
- TV: 192.168.100.159
- Raspberry Pico: 192.168.100.216
For samsung
