[ale] ISC DHCPD configuration and logging

[james.sumners at gmail.com (James Sumners)]

I really, _really_, wish there were an alternative to this software. But
even their own Kea is a long way from production ready. Anyway...

There seems to be a way to craft custom log messages along with some sort
of scripting language:

```
if not exists host-name {
 set hostline = "DHCPNone";
} else {
 set hostline = option host-name;
}
on commit { log(info, concat("DHCP-commit", " ", binary-to-ascii(10, 8,
".", leased-address)," ",hwprint," ", hostline)); }
```

I can't find one mention of this stuff in the dhcpd.conf man page. Does
anyone know where I could find documentation on it? I'm primarily concerned
with generating parseable messages (really, JSON structures) for lease
issues, releases, and expirations.

-- 
James Sumners
http://james.sumners.info/ (technical profile)
http://jrfom.com/ (personal site)
http://haplo.bandcamp.com/ (band page)
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