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Initially, QUIC-MUX was responsible to reset quic_conn <conn> member to NULL when MUX was released. This was performed via qcc_release(). However, qcc_release() is also used on qmux_init() failure. In this case, connection must be freed via its session, so QCC <conn> member is resetted to NULL prior to qcc_release(), which prevents quic_conn <conn> member to also be resetted. As the connection is freed soon after, quic_conn <conn> is a dangling pointer, which may cause crashes. This bug should be very rare as first it implies that QUIC-MUX initialization has failed (for example due to a memory alloc error). Also, <conn> member is rarely used by quic_conn instance. In fact, the only reproducible crash was done with QUIC traces activated, as in this case connection is accessed via quic_conn under __trace_enabled() function. To fix this, detach connection from quic_conn via the XPRT layer instead of the MUX. More precisely, this is performed via quic_close(). This should ensure that it will always be conducted, either on normal connection closure, but also after special conditions such as MUX init failure. This should be backported up to 2.6.
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.