Add a new file implementing support for opening sockets, sending and
receiving messages with control messages (e.g. addresses, timestamps),
and related operations, which should be simpler to use than the system
functions and allow their features to be reused between different parts
of the chrony code.
It is based on the ntp_io.c and ntp_io_linux.c files. It will be used by
the NTP client/server, cmdmon server, client, and others.
Rename NTP_Remote_Address to IPSockAddr to make it usable in non-NTP
context and provide NTP_Remote_Address for compatibility. Also, change
the type of port to uint16_t.
Don't abort on start when no UDP socket could be opened/bound for
cmdmon. The Unix socket is more important and with the IP_FREEBIND
option this case was not caught anyway.
Reorder the LOGS_Severity enum in order of severity and change the code
to not log/print messages with severity below the specified minimum
instead of having a separate debug level.
Specify SOCK_DGRAM socktype instead of SOCK_STREAM in hints for
getaddrinfo() as chronyd is (and will mainly be) using the returned
addresses to open UDP sockets. This shouldn't make a difference in
practice, but it might avoid some confusion.
In NIO_Linux_RequestTxTimestamp(), check the returned pointer and the
length of the buffer before adding the control message. This fixes an
issue reported by the Clang static analyzer.
With future kernels it may be possible to get, but not set, the HW
timestamping configuration on some specific interfaces like macvlan in
containers. This would require the admin to configure the timestamping
before starting chronyd.
If SIOCSHWTSTAMP failed on an interface, try SIOCGHWTSTAMP to check if
the current configuration matches the expected configuration and allow
the interface to be used for HW timestamping.
Stop trying to maintain a list of individual contributions. Just list
the contributors. For tracking individual changes in the source code
there is git.
Real-time scheduling and memory locking is available on posix compliant
OSs. This patch centralizes this functionality and brings support to
FreeBSD, NetBSD, and Solaris.
[ML: updated coding style]
Add a new set of tests for testing basic functionality, starting chronyd
with root privileges on the actual system instead of the simulator.
Tests numbered in the 100-199 range are considered destructive and
intended to be used only on machines dedicated for development or
testing. They are started by the run script only with the -d option.
They may adjust/step the system clock and other clocks, block the RTC,
enable HW timestamping, create SHM segments, etc.
Other tests should not interfere with the system and should work even
when another NTP server/client is running.
Fix an issue with Linux and musl libc where sched_setscheduler is not
implemented. It seems that pthread_setschedparam is more widely
supported across different C libraries and OSs. For our use case, it
should make no difference which call is used.
On FreeBSD, sendmsg() fails when IP_SENDSRCADDR specifies a source
address on a socket that is bound to the address. This prevents a server
configured with the bindaddress directive from responding to clients.
Add a new variable to check whether the server IPv4 socket is not bound
before setting the source address.
A new ioctl will probably be added in Linux 4.21. It should enable a
significantly more accurate measurement of the offset between PHC and
system clock.
