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- some minor cleanup (syscall return codes, dead code, use strlcpy,
etc)
- sanity check dhcp option values recieved by dhclient
so that things that should look like a hostname look like a
hostname, and things that should look like an ip address look
like an ip address, if they don't ignore the lease
offer because it's bogus.
- Make the dhcp server attempt to ping an address when it recieves
a RELEASE from it. If the address answers a ping, ignore the
release offer. This helps make spoofing releases to liberate
addresses more difficult.
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