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"rndc dumpdb" works asynchronously, i.e. the requested dump may not yet
be fully written to disk by the time "rndc" returns.  Prevent false
positives for the "serve-stale" system test by only checking dump
contents after the line indicating that it is complete is written.

Reduce the software entropy in the BIND source code by removing unused bin/tests/virtual-time/ directory.

This tests both the cases when the DLV trust anchor is of an
unsupported or disabled algorithm, as well as if the DLV zone
contains a key with an unsupported or disabled algorithm.

Michał Kępień authored Jan 24, 2019 and Matthijs Mekking committed Mar 19, 2019

Some values returned by dstkey_fromconfig() indicate that key loading
should be interrupted, others do not.  There are also certain subsequent
checks to be made after parsing a key from configuration and the results
of these checks also affect the key loading process.  All of this
complicates the key loading logic.

In order to make the relevant parts of the code easier to follow, reduce
the body of the inner for loop in load_view_keys() to a single call to a
new function, process_key().  Move dstkey_fromconfig() error handling to
process_key() as well and add comments to clearly describe the effects
of various key loading errors.

More specifically: ignore configured trusted and managed keys that
match a disabled algorithm.  The behavioral change is that
associated responses no longer SERVFAIL, but return insecure.

Move from conf.sh.in to conf.sh.common as they will also need to be
added to conf.sh.win32.  Add variables for testing disabled
algorithms.

bin/tests/system/stop.pl only waits for the PID file to be cleaned up
while named cleans up the lock file after the PID file.  Thus, the
aforementioned script may consider a named instance to be fully shut
down when in fact it is not.

Fix by also checking whether the lock file exists when determining a
given instance's shutdown status.  This change assumes that if a named
instance uses a lock file, it is called "named.lock".

Also rename clean_pid_file() to pid_file_exists(), so that it is called
more appropriately (it does not clean up the PID file itself, it only
returns the server's identifier if its PID file is not yet cleaned up).

MR !1141 broke the way stop.pl is invoked when start.pl fails:

  - start.pl changes the working directory to $testdir/$server before
    attempting to start $server,

  - commit 27ee629e causes the $testdir
    variable in stop.pl to be determined using the $SYSTEMTESTTOP
    environment variable, which is set to ".." by all tests.sh scripts,

  - commit e227815a makes start.pl pass
    $test (the test's name) rather than $testdir (the path to the test's
    directory) to stop.pl when a given server fails to start.

Thus, when a server is restarted from within a tests.sh script and such
a restart fails, stop.pl attempts to look for the server directory in a
nonexistent location ($testdir/$server/../$test, i.e. $testdir/$test,
instead of $testdir/../$test).  Fix the issue by changing the working
directory before stop.pl is invoked in the scenario described above.

Joey Salazar authored Jan 10, 2019 and Evan Hunt committed Mar 14, 2019

Test named logs control characters, special characters and large cmd line respectively as octal escaped, special escaped and elipsis

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().

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.

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.

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.

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.

Michał Kępień authored Mar 01, 2019 and Evan Hunt committed Mar 05, 2019

The "check key refreshes are resumed after root servers become
available" check may trigger a false positive for the "mkeys" system
test if the second example/TXT query sent by dig is received by ns5 less
than a second after it receives a REFUSED response to the upstream query
it sends to ns1 in order to resolve the first example/TXT query sent by
dig.  Since that REFUSED response from ns1 causes ns5 to return a
SERVFAIL answer to dig, example/TXT is added to the SERVFAIL cache,
which is enabled by default with a TTL of 1 second.  This in turn may
cause ns5 to return a cached SERVFAIL response to the second example/TXT
query sent by dig, i.e. make ns5 not perform full query processing as
expected by the check.

Since the primary purpose of the check in question is to ensure that key
refreshes are resumed once initially unavailable root servers become
available, the optimal solution appears to be disabling SERVFAIL cache
for ns5 as doing that still allows the check to fulfill its purpose and
it is arguably more prudent than always sleeping for 1 second.

For consistency between all system tests, add missing setup.sh scripts
for tests which do not have one yet and ensure every setup.sh script
calls its respective clean.sh script.

Temporary files created by a given system test should be removed by its
clean.sh script, not its setup.sh script.  Remove redundant "rm"
invocations from setup.sh scripts.  Move required "rm" invocations from
setup.sh scripts to their corresponding clean.sh scripts.

Do not use variable from configure to detect the feature.

Michał Kępień authored Feb 26, 2019 and Mark Andrews committed Mar 01, 2019

If dots are not escaped in the "1.2.3.4" regular expressions used for
checking whether IP address 1.2.3.4 is present in the tested resolver's
answers, a COOKIE that matches such a regular expression will trigger a
false positive for the "resolver" system test.  Properly escape dots in
the aforementioned regular expressions to prevent that from happening.