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    <p>If your application is being run by the user (i.e., double-clicked in the Finder), any attempt by your application to create a socket listener will prompt the user to allow/deny that listener - and subsequently adjust the firewall settings accordingly - without any programmatic intervention on the part of your application.</p> <p>If the firewall in question is your router (a problem I recently had to deal with), you have a few options. The best supported option is Bonjour/mDNSResponder (as long as you don't want to support a double-nat'ed situation). Apple provides an Objective-C wrapper application around the rather obtuse dns_sd.h:</p> <p><a href="http://developer.apple.com/library/mac/#samplecode/PortMapper/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007879-Intro-DontLinkElementID_2" rel="nofollow">http://developer.apple.com/library/mac/#samplecode/PortMapper/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007879-Intro-DontLinkElementID_2</a></p> <p>Going the 3rd party route, take a look at TCM Port Mapper. It uses some deprecated features and it'll take a bit of effort to get it running with ARC support (if that's important to you).</p> <p><a href="http://code.google.com/p/tcmportmapper/" rel="nofollow">http://code.google.com/p/tcmportmapper/</a></p> <p>Both support UPnP and NAT-PMP.</p> <p>Finally, if your application is running as a daemon (without a user interface), you're going to have to become acquainted with ipfw. Brace yourself. Google for "ipfw os x". StackOverflow is preventing me from posting more than two links. Brilliant.</p> <p>Hope this helps....</p>
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