tree 1a6ae499ae0c8e6d7883e086803b8868c0a680b9
parent 619a6ae8ced395ccc2933220540b21738132a0cb
author Willy Tarreau <w@1wt.eu> 1418037088 +0100
committer Willy Tarreau <w@1wt.eu> 1418037298 +0100
encoding latin1

BUG/MEDIUM: tcp-checks: disable quick-ack unless next rule is an expect

Using "option tcp-checks" without any rule is different from not using
it at all in that checks are sent with the TCP quick ack mode enabled,
causing servers to log incoming port probes.

This commit fixes this behaviour by disabling quick-ack on tcp-checks
unless the next rule exists and is an expect. All combinations were
tested and now the behaviour is as expected : basic port probes are
now doing a SYN-SYN/ACK-RST sequence.

This fix must be backported to 1.5.
(cherry picked from commit f3d3482c984593b21a6d3de6d66a83a338316b85)