UDP multicast on iOS with WWAN turned on

[Sebastian Dröge]

On Fri, 2016-12-09 at 07:52 +0200, Sebastian Dröge wrote:
> On Thu, 2016-12-08 at 12:54 +0100, Dries Langsweirdt wrote:
> > 
> > When I compare this with the socket creation code in Glib, I see a
> > few differences:
> > 
> > > > - https://github.com/GNOME/glib/blob/master/gio/gsocket.c#L2280 =>
> > GlIb is using the group join operation IP_ADD_SOURCE_MEMBERSHIP,
> > while the above code uses MCAST_JOIN_GROUP.
> > > > - https://github.com/GNOME/glib/blob/master/gio/gsocket.c#L2236 =>
> > GLib is only setting if_nametoindex (iface), but not
> > mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY), while in the
> > above code: addr.sin_addr.s_addr = INADDR_ANY; and mreq.gr_interface
> > = if_nametoindex (iface);
> 
> That would seem like a bug in iOS's network stack then.
> IP_ADD_SOURCE_MEMBERSHIP and MCAST_JOIN_GROUP should have the same
> effect. But we should probably change GLib to switch to the other one
> in that case.
> 
> You said, you talked to an Apple engineer. Maybe ask him about the
> differences between the two sockopts and if they can fix their code so
> they behave the same in the future.
> 
> 
> Please also file a bug about this against GLib:
> https://bugzilla.gnome.org/enter_bug.cgi?product=glib

I did that now, you can find it here:
https://bugzilla.gnome.org/show_bug.cgi?id=775873

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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