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Bug#595779: unblock: cvsd/1.0.20

On Tue, Sep  7, 2010 at 21:50:14 +0200, Arthur de Jong wrote:

> On Mon, 2010-09-06 at 23:37 +0200, Julien Cristau wrote:
> > On Mon, Sep  6, 2010 at 18:13:59 +0200, Arthur de Jong wrote:
> > > Please unblock package cvsd. The 1.0.20 contains a fix for mixing IPv4
> > > and IPv6 sockets regardless of the order of addresses returned by
> > > getaddrinfo() (which changed between lenny and squeeze) and the
> > > net.ipv6.bindv6only sysctl.
> > 
> > Ignoring failure from bind(2) seems like a pretty bad idea.
> The daemon does a call to getaddrinfo() to figure out which addresses it
> should listen on and tries each one. Currently at least one bind() of
> the returned addresses should succeed, other failures are ignored.
I can't see any reason for bind() failure to not be fatal...

> Ignoring bind() failures used to be necessary when not using
> IPV6_V6ONLY. Without it both IPv6 and IPv4 addresses were returned and
> the bind on the IPv4 address would always fail if the IPv6 one
> succeeded. cvsd 1.0.20 only changes which failures are ignored.
They should both succeed if done in the right order, iirc (meaning the
order they're returned from getaddrinfo() with AI_PASSIVE).  And in any
case they should both succeed with IPV6_V6ONLY set.


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