librelp 1.2.11

librelp 1.2.11 [download]

This new release of librelp is mostly a bugfixing release that fixes several issues, especially a potential segfault. The new version also has an API enhancement that adds a configurable connection timeout.

For more details, please take a look at the changelog below.

———————————————————————-
Version 1.2.11 – 2016-06-22
– bugfix: do not accept more than one “open” verb on a connection
 closes https://github.com/rsyslog/librelp/issues/37
– bugfix: potential segfault when high-numbered fd is used in sender
 When a fd (socket) with value >= 1024 was used by the client sender
 process, the library could segfault in select(). This depended a bit
 on the platform.
 This patch solves the issue by replacing the select() call with
 poll(). Note that we do not changed to epoll(), because
 (a) we only wait on a single fd
 (b) poll() is more portable
 closes https://github.com/rsyslog/librelp/issues/38
– bugfix: make librelp not run in thight loop when out of sockets
 If the process can no longer accept new connections (via accept)
 because it has reached its file handle maximum, librelp runs in
 a thight loop until either the client connection request is aborted
 or a file handle becomes available.
 This happens due to the fact that we get event notifications on
 connection requests. As we can’t satisfy it, we librelp always
 retries. Unfortunately, there is no socket call to cancel a
 connection request, so we cannot push the client request out.
 An alternative solution would be to close and re-open the
 listening socket, but in that case it is uncertain if we ever can
 re-aquire a socket (an easy DoS). So the best thing we can
 probably do is delay retries a bit. We must be careful, however,
 not to use a too long delay, as that would also affect other
 connections. We could address that problem via a dedicated thread
 for the listening process, but librelp is designed so that it can
 be used by callers with any threading library and threading model,
 and that would violate this design principle.
 Judging the alternatives, a slight delay probably is the best
 solution, especially as the situation is uncommon and will hopefully
 not last too long. This patch implements that solution.
 closes https://github.com/rsyslog/librelp/issues/34
– bugfix: flush the current recv frame if it exists if the client
 session is restarting
 Thanks to Nate Brown for the patch.
– API enhancement: add configurable connection timeout
 Thanks to Nate Brown for the patch.

sha256sum: 84de48f46caba0106d8853af572aa7b625c82dfbcf5f7cd13d2e57cce786e929

librelp 1.2.11
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