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In recent macOS releases Apple killed the kernel extension feature which we rely one to configure tun and tap devices. Also an alternative tun driver named utun appeared I never finished implementing it in libtuntap.
Why I got permission denied?
OS
uname -a
Darwin unix 19.4.0 Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64
Step to reproduce
# vim app.c
# gcc app.c -o app -ltuntap
$ brew cask install tuntap
# ./app
Error: Permission denied
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