Get UDP/TCP Payload for NWConnections?

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Is it somehow possible to get the transport layer (UDP and TCP) payload amounts for TLS or QUIC connections established via the Network framework? (From within the app itself that establishes the connections.)

I am currently using the ntstat.h kernel socket calls, but I hope there is a simpler solution. With ntstat, I have not yet been able to observe a specific connection. I have to search for the connection I am looking in all (userspace) connections.

Answered by DTS Engineer in 878111022

The droid you’re looking for here is the startDataTransferReport() method. It ultimately delivers a NWConnection.DataTransferReport structure, which includes statistics for each individual path and aggregated across all paths used by the connection.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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Answer 1

DTS Engineer OP

Apple

1d

Recommended

The droid you’re looking for here is the startDataTransferReport() method. It ultimately delivers a NWConnection.DataTransferReport structure, which includes statistics for each individual path and aggregated across all paths used by the connection.

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

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Answer 2

Pelea OP

1d

Yes, I already tested that method. But unfortunately, sentTransportByteCount and receivedTransportByteCount don’t include the Handshake payload even when I call startDataTransferReport before starting the connection.

So I get, for example, 35/31 Bytes instead of 1674/3070 Bytes for a simple "send 'Hello' and cancel" TLS connection.

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Answer 3

DTS Engineer OP

Apple

5h

Yes, I already tested that method.

Cool.

But unfortunately, [they] don’t include the Handshake payload

Bummer.

I actually chatted with the Network framework team about this overnight and they think that it should work the way you want it to work. Given that, my advice is that you file a bug against the data transfer report feature.

Please post your bug number, just for the record.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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