Convert sbin and usr.bin to check for imsgbuf_init failure and add
imsgbuf_allow_fdpass where needed.

OK tb@

Convert the common imsgbuf_read calls to the post EAGAIN world.

OK tb@

Use imsgbuf_clear() where appropriate instead of msgbuf_clear().

OK tb@

Rename imsg_init, imsg_clear, imsg_read, imsg_write and imsg_flush to
imsgbuf_init, imsgbuf_clear, imsgbuf_read, imsgbuf_write and imsgbuf_flush.

This separates the imsgbuf API from the per-imsg API

Rename imsg_init, imsg_clear, imsg_read, imsg_write and imsg_flush to
imsgbuf_init, imsgbuf_clear, imsgbuf_read, imsgbuf_write and imsgbuf_flush.

This separates the imsgbuf API from the per-imsg API.

OK tb@

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Convert imsg_write() callers to the new simplified return logic.

OK tb@

Introduce imsg_write() and use it instead of msgbuf_write().

imsg_write() is just a thin wrapper around msgbuf_write(). So this is
mostly search and replace.

OK tb@

Implement lease files.

DHCPv6 is not concerned with link layer addresses.
pointed out by martijn

Import dhcp6leased(8)

dhcp6leased is a daemon to manage IPv6 prefix delegations. It requests
a prefix from an upstream DHCPv6 server and configures downstream
network interfaces. rad(8) can be used

Import dhcp6leased(8)

dhcp6leased is a daemon to manage IPv6 prefix delegations. It requests
a prefix from an upstream DHCPv6 server and configures downstream
network interfaces. rad(8) can be used to advertise available prefixes
to clients.

It's a transmogrified dhcpleased(8), so it's a bit rough around the
edges. But it can already request and renew prefixes and configure
interfaces. It's time to hack on it in-tree.

OK deraadt

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