Looks like I never even tested this. There were two problems:
1) when we asked for the recvmsg and sendmsg functions, we used the
wrong variable (socketDescriptor was still -1)
2) we extracted the destination addresses, but never set them in the
QIpPacketHeader object
The added tests confirm that this works on Windows, Linux, Darwin,
FreeBSD. There also seems to be a problem, obtaining the destination
address on an IPv4 socket with a dual-stack sender (I can reproduce that
on FreeBSD, macOS and Windows, plus an old version of Linux).
Task-number: QTBUG-63605
Change-Id: I638cf58bfa7b4e5fb386fffd14ea732bddbc0c42
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
484a186f50