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POHow to send UDP broadcast packets through all interfaces in Objective-C / OS X 10.8 (DHCP)
 

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  1. POHow to send UDP broadcast packets through all interfaces in Objective-C / OS X 10.8 (DHCP)
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    <p>I am creating a small utillity which has to serve an IP address and parameters over BOOTP on my MacBook Pro.</p> <p>I have used the AsyncUdpSocket library from GitHub (thanks RobbieHanson) and when I have my machine configured with just the wired ethernet connected (Airport Off) then it works. However, as soon as I enable my Wifi as well, all the broadcast replys go down the Wifi interface instead. This causes the wired clients to get no answer.</p> <p><strong>Initialise/Receive Code:</strong></p> <pre><code>if (![socket bindToAddress:@"0.0.0.0" port:67 error:&amp;err]) NSLog(@"Error: unable to bind (%@)", [err localizedDescription]); [socket enableBroadcast:YES error:&amp;err]; [socket receiveWithTimeout:-1 tag:0]; </code></pre> <p><strong>Send Code:</strong></p> <pre><code>[sock sendData:packetData toHost:@"255.255.255.255" port:68 withTimeout:-1 tag:0]; </code></pre> <p>I am sure there must be a way to do this, but this is my first OS X program and I am struggling to master my google-search etiquette to suit the frameworks :)</p> <p><strong>UPDATE</strong></p> <p>I have messed about with my code tonight and inspected what the AsyncUdpSocket is doing when I am calling it. Essentially I have the following situation; if I call <code>bindToAddress</code> and supply <code>10.0.0.1</code> (the address assigned to my ETH NIC) then I neither receive any packets NOR can I send them. However, if I pass <code>nil</code> into the method then I can send a message AND receive the broadcasts - the downside being that the sending goes out over my WIFI NIC (default route)</p> <p>In the background - the <code>AsyncUdpSocket</code> library is calling <code>CFSocketSetAddress</code> with either IFADDR_ANY when supplied a nil value OR a populated IFADDR struct of 10.0.0.1 if that is supplied. No errors are thrown and so it should be expected to work.</p> <p>Any ideas? I am going up the wall and just want this solved. I really like the async nature of teh library so I don't want to throw it out.</p>
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