[Bug 23630] Per-connection resource randomization increases the window in which you lose messages

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23630


Will Thompson <will.thompson at collabora.co.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |will.thompson at collabora.co.u
                   |                            |k
  Status Whiteboard|review-                     |




--- Comment #4 from Will Thompson <will.thompson at collabora.co.uk>  2009-10-22 04:36:37 PST ---
(In reply to comment #3)
> > +  /* 32 bytes of hex. The first 8 should be unique enough... */
> > +  return g_strndup (local_machine_id, 8);
> 
> This assumes that the machine ID is uniformly pseudo-random, and therefore any
> byte is as good as any other, but the D-Bus spec doesn't guarantee that. It
> does note that:
> 
> > To generate a UUID, the current reference implementation concatenates 96
> > bits of random data followed by the 32-bit time in seconds since the UNIX
> > epoch (in big endian byte order). 
> 
> So, in fact your assumption is right for libdbus, but it needn't be. Perhaps we
> should hash the machine ID and use that, in order to mix the pseudo-random and
> deterministic parts; also, perhaps telepathy-glib should grow a utility
> function to do this?

http://dbus.freedesktop.org/doc/dbus-specification.html#uuids:

> Implementations should, however, stick to random data for the first 96 bits of the UUID. 

But okay, whatever, branch updated.


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