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-*- outline -*-
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* What characters may be used for host name?
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As say RFC 952 hostname is a text string up to 24 characters drawn from the alphabet
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(A-Z), digits (0-9), minus sign (-), and period (.).
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As say RFC 1035:
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<domain> ::= <subdomain> | " "
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<subdomain> ::= <label> | <subdomain> "." <label>
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<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]
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<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
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<let-dig-hyp> ::= <let-dig> | "-"
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<let-dig> ::= <letter> | <digit>
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<letter> ::= any one of the 52 alphabetic characters A through Z in
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upper case and a through z in lower case
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<digit> ::= any one of the ten digits 0 through 9
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