ZNC

ZNC is an open-source IRC bouncer that maintains a persistent connection to IRC networks. It acts as a proxy between the user and the IRC server, ensuring that the user remains connected to their channels and conversations even when their local client is offline. This prevents the user from appearing as disconnected and ensures they do not miss important communications during periods of inactivity.

Deployed as a server application, ZNC buffers messages from channels and private conversations. When a user connects via a compatible IRC client, the software replays the buffered history to bring the user up to speed. It is configured via a command line tool, a configuration file, or a web-based administration interface, allowing for flexible management of network settings and user accounts.

Key features

• Buffers messages per channel for offline replay
• Supports SSL/TLS for encrypted connections
• Provides a web-based administration interface
• Allows multiple clients to connect to the same account
• Supports custom module development in C++, Python, and Perl
• Includes a configuration generator via the makeconf command
• Integrates with Cyrus SASL for authentication
• Manages per-user data and network configurations

The software is built using the CMake toolchain and requires a C++ compiler such as GCC or Clang. It supports various character encodings through ICU and provides internationalization via Boost.Locale to support multiple languages. Users can extend the functionality of the server by loading global modules or writing their own using ModPerl or ModPython. The system stores data in a dedicated directory, separating global module settings from per-user network configurations and certificates.

ZNC is designed for IRC users who require a permanent presence on a network and the ability to retrieve missed messages across different devices. It serves as a middle layer that stabilizes the connection between the end user and the IRC infrastructure.