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Reuse the same checks two times, make difference minimal.

Silence a Perl warning output by stop.pl

See merge request isc-projects/bind9!1649

On Unix systems, the CYGWIN environment variable is not set at all when
BIND system tests are run.  If a named instance crashes on shutdown or
otherwise fails to clean up its pidfile and the CYGWIN environment
variable is not set, stop.pl will print an uninitialized value warning
on standard error.  Prevent this by using defined().

Allow ifconfig to be called from any directory

See merge request isc-projects/bind9!1563

Petr Menšík authored Feb 25, 2019 and Mark Andrews committed Mar 11, 2019

ifconfig.sh depends on config.guess for platform guessing. It uses it to
choose between ifconfig or ip tools to configure interfaces. If
system-wide automake script is installed and local was not found, use
platform guess. It should work well on mostly any sane platform. Still
prefers local guess, but passes when if cannot find it.

Stabilize "delzsk.example" zone checks

See merge request isc-projects/bind9!1640

When a zone is converted from NSEC to NSEC3, the private record at zone
apex indicating that NSEC3 chain creation is in progress may be removed
during a different (later) zone_nsec3chain() call than the one which
adds the NSEC3PARAM record.  The "delzsk.example" zone check only waits
for the NSEC3PARAM record to start appearing in dig output while private
records at zone apex directly affect "rndc signing -list" output.  This
may trigger false positives for the "autosign" system test as the output
of the "rndc signing -list" command used for checking ZSK deletion
progress may contain extra lines which are not accounted for.  Ensure
the private record is removed from zone apex before triggering ZSK
deletion in the aforementioned check.

Also future-proof the ZSK deletion progress check by making it only look
at lines it should care about.

"dnssec" system test tweaks

Closes #129

See merge request isc-projects/bind9!1545

For checks querying a named instance with "dnssec-accept-expired yes;"
set, authoritative responses have a TTL of 300 seconds.  Assuming empty
resolver cache, TTLs of RRsets in the ANSWER section of the first
response to a given query will always match their authoritative
counterparts.  Also note that for a DNSSEC-validating named resolver,
validated RRsets replace any existing non-validated RRsets with the same
owner name and type, e.g. cached from responses received while resolving
CD=1 queries.  Since TTL capping happens before a validated RRset is
inserted into the cache and RRSIG expiry time does not impose an upper
TTL bound when "dnssec-accept-expired yes;" is set and, as pointed out
above, the original TTLs of the relevant RRsets equal 300 seconds, the
RRsets in the ANSWER section of the responses to expiring.example/SOA
and expired.example/SOA queries sent with CD=0 should always be exactly
120 seconds, never a lower value.  Make the relevant TTL checks stricter
to reflect that.

Always expecting a TTL of exactly 300 seconds for RRsets found in the
ADDITIONAL section of responses received for CD=1 queries sent during
TTL capping checks is too strict since these responses will contain
records cached from multiple DNS messages received during the resolution
process.

In responses to queries sent with CD=1, ns.expiring.example/A in the
ADDITIONAL section will come from a delegation returned by ns2 while the
ANSWER section will come from an authoritative answer returned by ns3.
If the queries to ns2 and ns3 happen at different Unix timestamps,
RRsets cached from the older response will have a different TTL by the
time they are returned to dig, triggering a false positive.

Allow a safety margin of 60 seconds for checks inspecting the ADDITIONAL
section of responses to queries sent with CD=1 to fix the issue.  A
safety margin this large is likely overkill, but it is used nevertheless
for consistency with similar safety margins used in other TTL capping
checks.

Commit c032c54d inadvertently changed
the DNS message section inspected by one of the TTL capping checks from
ADDITIONAL to ANSWER, introducing a discrepancy between that check's
description and its actual meaning.  Revert to inspecting the ADDITIONAL
section in the aforementioned check.

Changes introduced by commit 6b8e4d6e
were incomplete as not all time-sensitive checks were updated to match
revised "nta-lifetime" and "nta-recheck" values.  Prevent rare false
positives by updating all NTA-related checks so that they work reliably
with "nta-lifetime 12s;" and "nta-recheck 9s;".  Update comments as well
to prevent confusion.

Merge branch '803-add-return-code-to-allow-dlz-s-allowzonexfr-to-fall-back-to-to-the-view-s-allow-transfer-setting' into 'master'

Resolve "Add return code to allow dlz's allowzonexfr to fall back to to the view's allow-transfer setting."

Closes #803

See merge request isc-projects/bind9!1292

Restore missing check for flockfile and getc_unlocked

See merge request isc-projects/bind9!1653

autoconf has native support for detecting LFS support

See merge request isc-projects/bind9!1652

Set crlf in all *.vcxproj.* files

See merge request isc-projects/bind9!1651

Use compiler directive to include config.h as a first file

See merge request isc-projects/bind9!1650

Remove explicit '#include <config.h>' from the header files (the include should not have been there in the first place)

Fix regex used for mangling druz/DNSKEY (in the "dlv" system test)

See merge request isc-projects/bind9!1641

During "dlv" system test setup, the "sed" regex used for mangling the
DNSKEY RRset for the "druz" zone does not include the plus sign ("+"),
which may:

  - cause the replacement to happen near the end of DNSKEY RDATA, which
    can cause the latter to become an invalid Base64 string,

  - prevent the replacement from being performed altogether.

Both cases prevent the "dlv" system test from behaving as intended and
may trigger false positives.  Add the missing character to the
aforementioned regex to ensure the replacement is always performed on
bytes 10-25 of DNSKEY RDATA.

Make delv use OS-supplied ephemeral port range

Closes #925

See merge request isc-projects/bind9!1611

5180.	[bug]		delv now honors the operating system's preferred
			ephemeral port range. [GL #925]

Make delv honor the operating system's preferred ephemeral port range
instead of always using the default 1024-65535 range for outgoing
messages.

cleanup: use dns_secalg_t and dns_dsdigest_t where appropriate

See merge request isc-projects/bind9!1498

Tony Finch authored Feb 08, 2019 and Mark Andrews committed Mar 08, 2019

Use them in structs for various rdata types where they are missing.
This doesn't change the structs since we are replacing explicit
uint8_t field types with aliases for uint8_t.

Use dns_dsdigest_t in library function arguments.

Improve dnssec-cds with these more specific types.