host-name.rst
author Oleksandr Gavenko <gavenkoa@gmail.com>
Mon, 16 Sep 2019 22:13:19 +0300
changeset 2376 20b65f046002
parent 1912 8b81a8f0f692
permissions -rw-r--r--
Revoke privileges and drop role.
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.. -*- coding: utf-8; -*-
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============
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 Host names
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============
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.. contents::
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   :local:
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What characters may be used for host name?
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==========================================
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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