Add a new type of address for NTP sources that don't have a resolved
address yet. This will allow the sources to be displayed, modified and
deleted by chronyc.
Update utility functions to support the new addresses.
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.
Currently, on multihomed host, when chrony is not bound to a specific
IP address, a query is sent to an interface and the default source IP
hint for the back route differs, the reply will have a source IP
different than where the query was destinied to. This will cause
problems because connection tracking firewalls will drop the replies
and most likely the client program will get confused too.
This patch uses the IP_PKTINFO mechanism to get the IP address where
received packets where targetted to and use that IP address as source
hint when sending a reply.
This is a verbatim copy of the files at that stage of the repository that was
built from the CVS import. It allows future development to see a bit of recent
history, but without carrying around the baggage going back to 1997. If that
is really required, git grafts can be used.
