Support Darwin's native utun device #2
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Apple's XNU kernel supports native TUN interface called
utunfrom iOS 4.1 and OS X 10.7 Lion. It is a bit different from the standard TUN interface, which is similar with the OpenBSD one.This patch adds necessary code to build up the utun interface and set
session->use_pi = 2for manipulating TUN devices just like OpenBSD. It is tested to work on OS X 10.9 Mavericks.References:
OpenVPN
utunpatch: http://thread.gmane.org/gmane.network.openvpn.devel/7464/focus=7739Mac OS X and iOS Internals: http://newosxbook.com/src.jl?tree=listings&file=17-15-utun.c