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From: Markus Armbruster <armbru@redhat.com>
References: <20170428121553.22408-1-berrange@redhat.com>
	<6f1ae51f-5336-7789-66b0-c4f984b5c0cc@redhat.com>
	<20170428145921.GG11415@redhat.com>
Date: Fri, 28 Apr 2017 17:31:42 +0200
In-Reply-To: <20170428145921.GG11415@redhat.com> (Daniel P. Berrange's message
	of "Fri, 28 Apr 2017 15:59:21 +0100")
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Subject: Re: [Qemu-devel] [PATCH] sockets: ensure we can bind to both ipv4 &
 ipv6 separately
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Eric Blake <eblake@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>

"Daniel P. Berrange" <berrange@redhat.com> writes:

> On Fri, Apr 28, 2017 at 09:57:24AM -0500, Eric Blake wrote:
>> On 04/28/2017 07:15 AM, Daniel P. Berrange wrote:
>> > When binding to an IPv6 socket we currently force the
>> > IPV6_V6ONLY flag to off. This means that the IPv6 socket
>> > will accept both IPv4 & IPv6 sockets when QEMU is launched
>> > with something like
>> > 
>> >   -vnc :::1
>> 
>> At first glance, I thought that was too many :.  But I guess it is
>> parsed as host:screen, with host of '::', and port offset of '1'...
>
> Yeah, I was amazed when it actually worked in fact :-) I thought
> I was going to have to use {::}:1, but it seems we reverse search
> for the last ':'.

I would've expected we need ":[::1]".  Too many ad hoc parsers...

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