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tests: add --dev null test suite
This PR adds a --dev null test suite. The implementation has been described in doc/t_server_null.rst. In addition the scripts themselves include plenty of documentation on what is happening.
This particular incarnation of --dev null has been stress-tested for ~2000 rounds with zero failure rate. Currently tested platforms are Fedora Linux 38 and FreeBSD 14. Any changes to the test suite, in particular its logic, will need to be exposed to a fairly comprehensive tests to avoid subtle issues; for example, in one case a small bug caused ~1% test failure rate - a rate which is impossible to notice without hundreds or so rounds of stress-testing.
Made changes based on openvpn-devel IRC discussions:
- Used the same privilege escalation mechanism as in t_client.sh
- Kill server instances using the info in their pid files instead of netcat
- Fix some documentation/comment issues
@flichtenheld I applied your suggestions and ran in-tree and out-of-tree builds and did some stress testing just in case. Everything seemed to work fine. Perhaps we're close to the point where these changes could be wrapped into a patch (series) and sent to openvpn-devel?
@flichtenheld I believe the parallel make issue is now gone, see latest commit.
@flichtenheld I believe the parallel make issue is now gone, see latest commit.
Note that t_client.sh seems to fail if the host "make check" runs on does not have IPv6. That caught me by surprise yesterday.