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A library for blocking access to network on-the-fly
LibNetBlock is a library that on-the-fly (by preloading) prevents a program under its control to use the network, to help to keep the user's privacy, prevent data leakage and virus spreading.
You can think of LibNetBlock as a simple layer-7 (L7) firewall that simply blocks the network access for the program it controls.
There is NO NEED to rebuild your software, because LibNetBlock is a pre-loadable library, meaning you just need to RUN the software with LibNetBlock loaded.
LibNetBlock is also a development library.
See the project homepage https://libnetblock.sourceforge.io and the project Wiki in the menu above.
Integrated packet generator and sniffer for Ethernet, but also works with blocks of data over TCP connection. Enables you to use scripts for automated testing, monitoring, imitating of various network objects, creating custom network tools.