On an iPhone I have created a UDP socket and bound it to the WLAN interface. I enabled SO_BROADCAST and I am able to send broadcast packets to the network (confirmed by a client running on my notebook.) But the UDP socket on the iPhone is unable to receive broadcast packets.
In my opinion this is a kernel bug, because not allowing a socket with SO_BROADCAST enabled to receive any broadcast packet, is a bad design decision.
The problem is further described here and here. The most popular solution to this problem is to bind to INADDR_ANY. However, it would be nice to be able to bind an UDP socket to only one interface while still receiving broadcast packets! Is there really no way to achieve this?
(When I bind a socket to 192.168.1.7 on a class C net (/24), it should accept packets sent to 192.168.1.7 and packets sent to 192.168.1.255!)
Thanks!
