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To emit CONNECTION_CLOSE frame, a special buffer is allocated via qc_txb_store(). This is due to QUIC_FL_CONN_IMMEDIATE_CLOSE flag. However this flag is reset after qc_send_ppkts() invocation to prevent reemission of CONNECTION_CLOSE frame. qc_send() can invoke multiple times a series of qc_prep_pkts() + qc_send_ppkts() to emit several datagrams. However, this may cause a crash if on first loop a CONNECTION_CLOSE is emitted. On the next loop iteration, QUIC_FL_CONN_IMMEDIATE_CLOSE is resetted, thus qc_prep_pkts() will use the wrong buffer size as end delimiter. In some cases, this may cause a BUG_ON() crash due to b_add() outside of buffer. This bug can be reproduced by using a while loop of ngtcp2-client and interrupting them randomly via Ctrl+C. Here is the patch which introduce this regression : cdfceb10ae136b02e51f9bb346321cf0045d58e0 MINOR: quic: refactor qc_prep_pkts() loop
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.