Aurelien DARRAGON bc3cdd6151 BUG/MINOR: log: fix lf_text() behavior with empty string
As reported by Baptiste in GH #2797, if a logformat alias leveraging
lf_text() ends up printing nothing (empty string), the whole logformat
evaluation stops, leading garbage log message.

This bug was introduced during 3.0 cycle in fcb7e4b ("MINOR: log: add
lf_rawtext{_len}() functions"). At that time I genuinely thought that
if strlcpy2() returned 0, it was due to a lack of space, actually
forgetting that the function may simply be called with an empty string.

Because of that, lf_text() would return NULL if called with an empty
string, and since all lf_*() helpers are expected to return NULL on
error, this explains why the logformat evaluation immediately stops in
this case.

To fix the issue, let's simply consider that strlcpy2() returning 0 is
not an error, like it was already the case before.

It should be backported in 3.1 and 3.0 with fcb7e4b.

(cherry picked from commit 3e470471b7e0ec113807f6981699fda9538e7ffc)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit ef8324f124f1ba0a98648edd49723ee2b8819bbe)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
2024-12-11 14:42:35 +01:00
2021-09-16 09:14:14 +02:00
2024-11-07 17:32:22 +01:00
2024-11-07 17:32:22 +01:00
2024-11-07 17:32:22 +01:00

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)
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