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Editorial Team
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Asked: 2026-05-16T01:05:23+00:00

I have a config file that completely describes how to connect to a VPN.

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I have a config file that completely describes how to connect to a VPN. I’d like to write a tool (C or Objective-C) to read in the file and then create a new VPN interface on the system.
I’m guessing the answer will have something to do with SCNetworkServiceCreate and/or SCNetworkInterfaceCreateWithInterface. Both of these want to bind to another interface. What stumps me is that, in theory, the VPN connections should ride on top of any IP interface so I’m at a loss what to use for the base interface.
Any help or pointers would be greatly appreciated.

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1 Answer

  1. Editorial Team

    Answering this for completeness.

    So, the answer is not well documented. However, there is a magical constant interface definition for any protocol that you want to ride on top of the currently connected IPv4 interface, kSCNetworkInterfaceIPv4.

    Therefore the code to create a new VPN builds the VPN stack on top of that interface.

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