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WIP: add some network diagnostics #589

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WIP: add some network diagnostics #589

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Commits on Jul 13, 2022

  1. dune: add missing dependency on result 

    Signed-off-by: David Scott <[email protected]>
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    djs55 committed Jul 13, 2022
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  2. Move RST handling into intercept_tcp 

    Previously we had
- Endpoint.input_tcp: which handled RST and then called
  intercept_tcp_syn with a default forwarding option (connect to (ip,
  port))
- Endpoint.intercept_tcp_syn: also used by services like the HTTP proxy

The RST handling wasn't clear for the HTTP proxy etc, so rename
intercept_tcp_syn to intercept_tcp and ensure it handles RST packets
too.

Signed-off-by: David Scott <[email protected]>
    @djs55
    djs55 committed Jul 13, 2022
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  3. extract a function which forwards to a TCP socket 

    We will have a future function which forwards to a Unix socket.

Signed-off-by: David Scott <[email protected]>
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  4. Tcp.Flow: prepare to support other socket types 

    For now we only track connected TCP sockets, but in a future patch
we will add Unix sockets.

Prepare by tagging the socket with `Tcp socket and move the close
logic into the module.

Signed-off-by: David Scott <[email protected]>
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    djs55 committed Jul 13, 2022
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  5. add a table of TCP -> Unix domain socket forwards 

    This is modelled on the existing "Gateway_forwards"

Signed-off-by: David Scott <[email protected]>
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    djs55 committed Jul 13, 2022
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  6. add command-line --forwards <json path> 

    This reads and watches the <json path> for configuration updates,
modelled on the existing `--gateway-forwards`

Signed-off-by: David Scott <[email protected]>
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  7. add transparent TCP -> Unix domain socket forwarding 

    Define a simple handshake with a .json-formatted request and response.

Signed-off-by: David Scott <[email protected]>
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  8. add a test for the TCP forwarder 

    Signed-off-by: David Scott <[email protected]>
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    djs55 committed Jul 13, 2022
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  9. debug: add a vpnkit.exe curl <url> command 

    This will allow testing of the I/O system.

Signed-off-by: David Scott <[email protected]>
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  10. Add verbose debug printing around connect 

    Signed-off-by: David Scott <[email protected]>
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  11. HACK: HTTP server always uses the forwarder 

    Signed-off-by: David Scott <[email protected]>
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    djs55 committed Jul 13, 2022
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