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[Qemu-devel] NBD drives with literal IPv6 addresses or hostnames startin

From: Ján Tomko
Subject: [Qemu-devel] NBD drives with literal IPv6 addresses or hostnames starting with a digit
Date: Fri, 31 May 2013 13:38:51 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130521 Thunderbird/17.0.6


since qemu's commit v1.4.0-736-gf17c90b [1]:
    nbd: Keep hostname and port separate

* literal IPv6 addresses no longer work in nbd URIs, because getaddrinfo is
called with the surrounding brackets:
$ qemu-system-x86_64 -drive file=nbd://[::1]:1234/quack
qemu-system-x86_64: -drive file=nbd://[::1]:1234/quack: address resolution
failed for [::1]:1234: Name or service not known

* hostnames starting with a digit now work in nbd URIs.
Before that, or with the non-URI syntax, they fail because inet_parse assumes
them to be literal IPv4 addresses:
$ qemu-system-x86_64 -drive file=nbd:123flour:1234:exportname=gashunk
qemu-system-x86_64: -drive file=nbd:123flour:1234:exportname=gashunk: error
parsing IPv4 address '123flour:1234'

In libvirt, we use the URI format on the command line only if the host
contains ':', so hostnames starting with a digit still don't work.

Migration with NBD and a literal IPv6 address doesn't work either, but that's
purely libvirt's fault, as we don't escape it with brackets. I've just posted
a patch for that. [2]


[1] http://git.qemu.org/?p=qemu.git;a=commitdiff;h=f17c90b
[2] https://www.redhat.com/archives/libvir-list/2013-May/msg02022.html

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