Make the NTS-KE retry interval exponentially increasing, using a factor
provided by the NKE session. Use shorter intervals when the server is
refusing TCP connections or the connection is closed or timing out
before the TLS handshake.
The server session instances are reused for different clients. Separate
the server name from the label used in log messages and set it on each
start of the session.
When a source was replaced and the new source had the same slot as the
old source, a wrong message was logged. Fix the condition to distinguish
correctly between changed address and port.
Fixes: 9468fd4aa6 ("ntp: allow changing port of source")
Improve the check to work with the actual timestamp of the leap second
instead of the closest midnight and don't turn it off on the leap
timeout. Also allow sample times to be checked in addition to the system
time and NTP time to avoid accumulation of samples mixing pre-leap and
post-leap timestamps (causing error of +/-0.5 or +/-1.0 seconds).
Don't require the caller to provide a SCK_Message (on stack). Modify the
SCK_ReceiveMessage*() functions to return a pointer to static buffers,
as the message buffer which SCK_Message points to already is.
On Linux, enable the SO_REUSEPORT option on sockets bound to a port in
order to support load balancing with multiple chronyd instances
(configured to not adjust the system clock).
The IP_FREEBIND option already allowed different instances to bind to
the same address and port, but only one was actually receiving packets.
As the instances don't share their state, sharing the NTP port doesn't
work well with the interleaved mode, symmetric mode, and rate limiting.
Sharing the NTS-KE port will not work until the server keys can be
derived from a shared key.
Earlier versions of macOS do not provide clock_gettime(). This patch
checks for clock_gettime() at run-time and falls back to gettimeofday()
if the symbol is not present.
Update the local clock errors with each update of the leap status to
avoid the kernel marking the clock as unsynchronized when a large
number of NTP samples is dropped.
When a leap second status is updated by a source, don't wait for the
next source selection and full update of the reference. Count votes from
sources that passed the previous selection and update the reference leap
status directly.
This should allow leap seconds to spread quickly even when the
samples are dropped or delayed by the filters.
Remove leap status from the NTP sample and set it independently from
the sample accumulation in order to accept a leap second sooner when
samples are filtered.
The reset command drops all measurements and switches the reference to
the unsynchronised state. This command can help chronyd with recovery
when the measurements are known to be no longer valid or accurate, e.g.
due to moving the computer to a different network, or resuming the
computer from a low-power state (which resets the system clock).
The source handler resets SST instances on an unknown step, which
makes the sources unselectable, but SRC_SelectSource() doesn't call
REF_SetUnsynchronised() when no source is selectable.
Handle the step in the reference handler.
Fixes: 049eae661a ("sources: keep synchronized status with unreachable/unselectable sources")
Measure the interval since the start in order to provide a monotonic
time for periodical tasks not using timers like driftfile updates, key
refresh, etc. Return the interval in the double format, but keep an
integer remainder limiting the precision to 0.01 second to avoid issues
with very small increments in a long-running process.
Before enabling NTS, check for more gnutls functions (some added in
3.6.3) to avoid build failures with older gnutls versions. Also, make
sure that nettle supports the new AES interface (added in 3.0).
The onoffline command switches an unresolved source to the offline
status, even when the network is already up.
Ignore the onoffline command for unresolved sources to prevent sources
unexpectedly staying in the offline status, e.g. when the command is
issued from a network dispatcher script (and no other call is expected
later when the name is resolved).
Allow the nts and ntsport options to be specified for sources added from
chronyc. This is an incompatible change in the request, but there was no
release using the new REQ_ADD_SOURCE command yet.
Add an option to enable NTS for an NTP source. Check for NTS-specific
extension fields and pass the packets to the NTS-NTP code in order to
enable the NTS client and server.
