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The IPv4 code did not take into account that the header value might not contain the trailing NUL byte, possibly reading stray data after the header value, failing the parse and testing the IPv6 branch. That one adds the missing NUL, but fails to parse IPv4 addresses. Fix this issue by always adding the trailing NUL. The bug was reported on GitHub as issue #715. It's not entirely clear when this bug started appearing, possibly earlier versions of smp_fetch_hdr guaranteed the NUL termination. However the addition of the NUL in the IPv6 case was added together with IPv6 support, hinting that at that point in time the NUL was not guaranteed. The commit that added IPv6 support was 69fa99292e689e355080d83ab19db4698b7c502b which first appeared in HAProxy 1.5. This patch should be backported to 1.5+, taking into account the various buffer / chunk changes and the movement across different files.
The HAProxy documentation has been split into a number of different files for ease of use. 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)