X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:reply-to:message-id:to:subject
	:in-reply-to:references:mime-version:content-type
	:content-transfer-encoding; q=dns; s=default; b=lslpz6y8vaQxlw7u
	/v/NErZhqTAMRo7x9IH5CGOi/1hSMzCfDRvlwzyRFJ7U+GzlZvVYFVT5sJACjvyG
	a7A2q5qyHUJEWMJWssQqESlvRA0M6lK3ucZfQBFt114H8iC85Pr1YpiBT3yAt+WD
	0/9C9YxFmpZnKgNN4U8/IzcAhA0=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:reply-to:message-id:to:subject
	:in-reply-to:references:mime-version:content-type
	:content-transfer-encoding; s=default; bh=ZiEBpYuEIN8vNbjwynmsYK
	dekDY=; b=j9kR9wboljG7tycF0M9if3HUEg1IifxxoBveC5eUghYzN1x9cexgMh
	J67TUplxjn49VPf/kRaj2OLF8XeFeJTDxu3+8lk7l0ejyHx9VYO8/HA6KNLeBjwv
	jroyP6raUpaTis4sAQHThdP3/3EzaznhH409XOBY6k/ZOiLogvQhk=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=4.0 required=5.0 tests=AWL,BAYES_50,FREEMAIL_FROM,KAM_THEBAT,SPF_SOFTFAIL autolearn=no version=3.3.2 spammy=H*UA:Bat!, H*x:Bat!, H*r:4.80.1, H*F:D*yandex.ru
X-HELO:	smtp.ht-systems.ru
Date:	Fri, 25 Mar 2016 02:16:34 +0300
From:	Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To:	cygwin AT cygwin DOT com
Message-ID:	<1023719672.20160325021634@yandex.ru>
To:	cyg Simple <cygsimple AT gmail DOT com>, cygwin AT cygwin DOT com
Subject:	Re: Possible bug: ssh-host-config - getent when computer name is "-" (dash)
In-Reply-To:	<56F46003.2060704@gmail.com>
References:	<trinity-e5b0769d-61d9-4ca8-9820-6997056dc6a2-1458828746171 AT 3capp-mailcom-lxa02> <56F40B07 DOT 2020400 AT arcor DOT de> <56F46003 DOT 2060704 AT gmail DOT com>
MIME-Version:	1.0
X-IsSubscribed:	yes

Greetings, cyg Simple!

> On 3/24/2016 11:43 AM, Dirk Fassbender wrote:
>> Am 24.03.2016 um 15:12 schrieb Unknown Sender:
>>> I noticed this bug for the first time today on a computer that has the
>>> computer name "-" (dash).
>>>
>>> During ssh-host-config:
>>> *** Query: Do you want to use a different name? (yes/no) no
>>> /usr/bin/getent: invalid option -- '+'
>>> Try `getent --help' or `getent --usage' for more information.
>>> *** Query: Create new privileged user account '-\cyg_server' (Cygwin
>>> name: 'cyg_server')? (yes/no) yes
>>>
>>> I suspect this has to do with the computer name because getent &
>>> ssh-host-config have never failed this way for me before. Moreover
>>> getent seems to be able to query the computer name, and the error
>>> message makes me think that it may be connected.
>>>
>>> I included the 2nd query just to show that it continued the process
>>> after the error occurred. I'm not sure if this error is going to cause
>>> problems down the line.
>>>
>>> Will I be encountering tons of problems with a computer name of "-"?
>>> It seems to only be a problem right here & right now.
>>>
>> Hello,
>> 
>> the computer name "-" (dash) is illegal in the internet.

> Uh, that isn't true.

>> So many network utilities will have problems with this name.
>> 

> This might be true but doesn't invalidate the use of the hyphen.

>> See
>> https://en.wikipedia.org/wiki/Hostname
>> for a start about host name definitions.
>> 

> From this reference:
> "The Internet standards (Requests for Comments) for protocols mandate
> that component hostname labels may contain only the ASCII letters 'a'
> through 'z' (in a case-insensitive manner), the digits '0' through '9',
> and the hyphen ('-'). The original specification of hostnames in RFC
> 952, mandated that labels could not start with a digit or with a hyphen,
> and must not end with a hyphen."

> Note that hyphen (a.k.a. dash) is permitted.

http://tools.ietf.org/html/rfc1034#section-3.5

<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]

<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>

<let-dig-hyp> ::= <let-dig> | "-"

<let-dig> ::= <letter> | <digit>

<letter> ::= any one of the 52 alphabetic characters A through Z in
upper case and a through z in lower case

<digit> ::= any one of the ten digits 0 through 9

Even if http://tools.ietf.org/html/rfc2181#section-11 somewhat contradicts to
it, it still makes a strong case for interoperability.


-- 
With best regards,
Andrey Repin
Friday, March 25, 2016 02:04:28

Sorry for my terrible english...


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -