Ipv6 generator

[auerswal]

IPv6 support for -g, --generate with open-coded 128-bit arithmetic as needed.

[auerswal]

Coveralls on macos reports reduced coverage, because it looks at the code with IPv6 generator support (i.e., -DIPV6), but the tests for this new code are skipped, because the tests on macOS are run with SKIP_IPV6.

One IPv6 test on the Ubuntu based test systems fails, because they do not have an IPv6 default route, and Linux only installs fe80::/64 routes, not fe80::/10 routes, when an interface has a link-local IPv6 address. One of the new tests sends to address fe80:0:0:1:: (to test crossing the 64-bit boundary during address generation) which is just outside of fe80::/64. I did not see this on my development system, because my system does have an IPv6 default route.

When adding a blackhole, unreachable, or prohibit route for fe80::/10 to my development system, fping reports errors (Invalid argument for blackhole, No route to host for unreachable, and Permission denied for prohibit). Thus this would not change the test outcome.

I see at least two methods to address this problem:

1. I could remove the test for an empty stderr for this test.
2. I could add another SKIP_… variable, e.g., SKIP_IPV6_DEFAULT_ROUTE.

I think it is OK to not look at stderr for this test, because stdout is tested to contain all addresses that shall be generated, and the test primarily checks if generating addresses works, not if sending packets to the generated addresses works, too. Additionally, other tests do verify an empty stderr when sending to generated link-local addresses.

I'll add a patch to change this test to ignore stderr to this pull request soon.

[coveralls]

Coverage decreased (-8.3%) to 70.305% when pulling 503cb884941f4c9a909446975de284a60261e894 on auerswal:ipv6-generator into ab1ed993badc1a6978b95c9d17a5e8b56fff4598 on schweikert:develop.

[auerswal]

The coverage/coveralls result seems bogus. It reports that test coverage of the files seqmap.c, socket4.c, and socket6.c has changed, but I did not remove any existing tests, and did not change those files.

The Coveralls - macos result is caused by building with IPv6 support on macOS, but not testing it. But building without IPv6 support and skipping IPv6 tests results in existing tests in file test-04-options-a-b.pl to fail, so this does not seem to be a good solution (without adjusting those tests).

[auerswal]

Is there any interest in this work?

[auerswal]

Closing this pull request due to lack of interest in this work.

[xtaran]

Please reopen.