veyron/runtimes/google/ipc: add support for selecting an 'appropriate' IP address to publish on.
In many cases, the Listen call uses an address that does not
specify which network interface/address to use for communicating
with the service - e.g. ":0". In these cases, the address returned
by Listen is 'unspecified' - e.g. 0.0.0.0 or the [] equivalent for
IPv6. This change provides a mechanism for choosing an address to
use from the set of available ones. The default, built-in behaviour
is to prefer any IPv4 address over IPv6 and public/routable over
private/non-routable addresses. This means that a private IPv4
trumps a public IPv6; this is debatable at best.
This default can be overriden by provided an option to the Server
factory that specifies an alternative function to use for choosing
the preferred address. Such functions will be provided by the Profiles.
This is the first CL required to add support for DHCP roaming.
Change-Id: If95a91ea6d95c28f85edfb3312d1207e3b7e1ce1
3 files changed
