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From: "manuel at mozilla dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/31413] New: getaddrinfo: DNS resolution fails if a CNAME target begins with a hyphen
Date: Mon, 26 Feb 2024 10:42:29 +0000 [thread overview]
Message-ID: <bug-31413-131@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=31413
Bug ID: 31413
Summary: getaddrinfo: DNS resolution fails if a CNAME target
begins with a hyphen
Product: glibc
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: network
Assignee: unassigned at sourceware dot org
Reporter: manuel at mozilla dot com
Target Milestone: ---
Clone of Firefox Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1870497
> User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0
>
> Steps to reproduce:
>
> Set up the following DNS records:
>
> www1.test A 192.0.2.1
> _www2.test A 192.0.2.1
> www3._www3.test A 192.0.2.1
> www_4.test A 192.0.2.1
> -www5.test A 192.0.2.1
> www6.-www6.test A 192.0.2.1
>
> cname1.test CNAME www1.test
> cname2.test CNAME _www2.test
> cname3.test CNAME www3._www3.test
> cname4.test CNAME www_4.test
> cname5.test CNAME -www5.test
> cname6.test CNAME www6.-www6.test
>
> Open all of the "cname1" to "cname6" hostnames as URLs in Firefox.
>
> Actual results:
>
> The "cname5" hostname returns "Server Not Found".
>
> The other names can be resolved and Firefox will connect to them.
>
> Expected results:
>
> All of "cname1" to "cname6" can be resolved and Firefox will connect to them.
>
> The hostnames used in CNAME targets (or chains of CNAME targets) should not be subject to the same validation as the hostname in the URL.
In Firefox on Linux we use glibc getaddrinfo to resolve hostnames. I think
fixing this in glibc would be best.
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next reply other threads:[~2024-02-26 10:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-26 10:42 manuel at mozilla dot com [this message]
2024-02-26 10:43 ` [Bug network/31413] " manuel at mozilla dot com
2024-02-26 21:31 ` fw at deneb dot enyo.de
2024-02-27 11:07 ` fw at deneb dot enyo.de
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