Similarly to the maxdelaydevratio test, include in the maximum delay
dispersion which accumulated in the interval since the last sample.
Also, enable the test for symmetric associations.
In symmetric mode, don't send a packet in interleaved mode unless it is
the first response to the last valid request received from the peer and
there was just one response to the previous valid request. This prevents
the peer from matching the transmit timestamp with an older response if
it can't detect missed responses.
Add options to allow running the tests in multiple iterations while
allowing a small number of failures per test. Some tests are expected to
fail occasionally as they are basically statistical tests. Improving
their reliability is possible, but it's always a compromise between
sensitivity, reliability, and execution time.
This is an incompatible change in the output of the tracking command,
which may break some scripts, but it's necessary to avoid confusion with
IPv4 addresses when synchronised to an IPv6 server or reference clock.
Use REF_GetReferenceParams() in the tracking command to simplify the
code and report the same values as what NTP clients of the server see.
When the local reference mode is active, this changes the leap status to
synchronised and reference time to one second behind current time. When
not synchronised, the root delay and root dispersion are now 1 second.
Add a new printf-like function to allow printing of all fields at once
and rework all commands which print a report to use it. Add functions
for printing of headers and information fields, and formatting of IP
addresses and reference IDs.
Remove automatic download and compilation of clknetsim. If clknetsim is
not found, skip all simulation tests, but don't fail "make check".
Also, respect the CLKNETSIM_PATH environment variable.
Since commit 8b235297, which changed address hashing, the first packet
is not sent to the first server and doesn't have the extra delay. If the
last packet is sent to the first server, the mean outgoing interval will
be significantly longer than the incoming interval and the check will
fail.
Add maxdistance directive to set the maximum root distance the sources
are allowed to have to be selected. This is useful to reject NTPv4
sources that are no longer synchronized and report large dispersion.
The default value is 3 seconds.
The leaponly option can be used to enable a mode where only leap seconds
are smoothed out and normal offset/frequency changes are ignored. This
is useful to make the interval in which a leap second is smoothed out
constant and allow an NTP client to use multiple leap smearing servers
safely.
The new NTPv4 loop synchronization check fails as clknetsim doesn't
support IP_PKTINFO yet. Use the noselect option to prevent the server to
synchronize to the client.
Add a new change type and use it when an unexpected time jump is
detected in the scheduler to reset reference times, offset and slewing,
NCR instances (with their polling interval), synchronization status, and
drop all sourcestats, manual, refclock and RTC samples.
This should make the recovery more graceful if the estimated jump has a
large error (e.g. select didn't timeout, or after system suspend).
The initstepslew code has its own minimal NTP implementation. Drop the
code, add a new initstepslew mode to the reference updating code and
use regular NTP sources with iburst flag for initstepslew addresses
instead. When an update is made or a source is found unreachable, log a
message, remove the initstepslew sources and switch to normal mode.
This reduces code duplication and makes initstepslew use features
implemented only in the main code like source combining or SO_TIMESTAMP
support.
