The functions related to dynamic loading of shared objects are a part
of the standard libc library on FreeBSD, while in Linux it is in libdl.
However, the linker on Linux seems to add the libdl linking automatically
when needed, so no need to explicitly link this library.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>
(cherry picked from commit 1b333949479e504017c7dffb6d70eecb53adb34a)

Make use of the iptables conntrack module instead of the older state module
for stateful firewalling.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>
(Backported commit f22b7bb5529b816eef840a1180b677e4ea31b124)

This memory leak got introduced with commit 525d75316848f79208101e48a54e2
which moves the daemonisation of the firewall thread.  Two environment
variables was not freed after usage.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>
(cherry picked from commit f4805d70cc4514b2569f8864ac138b5b21409cbc)

The eurephia plug-in would daemonize the OpenVPN process by calling
daemonize() too early.  This patch renames daemoinze() to efw_daemonize()
and calls it only in the firewall child process.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>
(cherry picked from commit 525d75316848f79208101e48a54e21396464c98b)

On Fedora 13 and Rawhide, the sem_wait(), sem_timedwait() and sem_post() functions
is no longer available in librt, only in libpthread.  Added extra CMake checks to
check if the functions are in libpthread if not found in librt.
(cherry picked from commit 6f8aaceabb37e350765bb1f2f895242cbf3e7521)

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>

This is related to the changes done in commit c6621d108bb8beb97ca61.