[Bug 3979] udhcpc should filter out malicious hostnames passed in option 0x0c

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3979

--- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com>  ---
We don't need to be particularly anal. For example, allowing _, hyphen at the
end, or leading and trailing dots would be ok, since it can't be used for
attacks. (Leading hyphen can be, if someone uses

cmd "$hostname"

in the script: then hostname may be treated as an option)

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