How to get socket options from NEAppProxyFlow?

Question

Created Oct ’22

Replies 2

Boosts 0

Participants 2

Hello. I'm developing a transparent proxy network extension by extending NETransparentProxyProvider. How can I get the original socket's options, i.e. what the app set using setsockopt() calls, from an NEAppProxyFlow? I'm particularly interested in the value of SO_KEEPALIVE, so I can enable keep-alives on my proxy's outgoing socket if they were enabled on the socket being proxied.

I got as far as -[NEAppProxyFlow setMetadata:] -> nw_parameters_copy_default_protocol_stack(nw_parameters_t) -> nw_protocol_stack_copy_transport_protocol(nw_protocol_stack_t), which returns an object of type nw_protocol_options_t, but there are no accessor functions to retrieve the actual values from it.

Boost

Answer 1

DTS Engineer OP

Apple

Oct ’22

I'm particularly interested in the value of SO_KEEPALIVE, so I can enable keep-alives on my proxy's outgoing socket if they were enabled on the socket being proxied.

There is no way to do that, but it seems like a perfectly reasonable enhancement request.

Please post your bug number, just for the record.

I got as far as -[NEAppProxyFlow setMetadata:]

That approach won’t work. It’s only sets the metadata on the parameters, that is, the info need to identify its originator. It leaves all the other parameters unchanged.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 2

ngorskikh OP

Oct ’22

There is no way to do that, but it seems like a perfectly reasonable enhancement request.

Please post your bug number, just for the record.

Thanks for the suggestion! I've filed FB11655901.

0