UDP is giving errors

[Ibtisam Tariq]

Hello, 

I have been trying to write a UDP testing script, but it is giving an error at the UDP packet line.
My script is (Took ref from: https://groups.google.com/g/packetdrill/c/ukcu93Y8LK8/m/-cYw3jh2AgAJ)
    0 socket(..., SOCK_DGRAM, IPPROTO_UDP) = 3
 +.01 sendto(3, ..., 500, 0, ..., ...) = 500
  +0 > udp (500)

But it is giving an error: (Both sides)
./udp2.pkt:3: error handling packet: no matching socket for script packet

I have been running it using a wire server and client framework.
Command at the client side is:
sudo ../../packetdrill/packetdrill  --local_ip=11.0.0.21 --gateway_ip=11.0.0.1 --netmask_ip=255.0.0.0 --remote_ip=11.0.0.15/24 --wire_client --wire_client_dev="eno8" --wire_server_ip=192.168.3.120  ./udp2.pkt

Command at the server side:
sudo ./packetdrill --wire_server --wire_server_dev=enp1s0f0

Please let me know the possible steps to test UDP.

Thanks, 

- Ibtisam

[Neal Cardwell]

Thanks for the report!

I'm able to reproduce the problem you report with UDP packets in remote/"wire" tests.

I have some proposed patches that may fix this, but have not had a chance to test them much. Would you be able to test by applying the attached patches with "git am *patch", recompiling, and re-running your tests?

Thanks!

neal

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[Ibtisam Tariq]

Hello Neal,

I have tried your provided patches. Now I am not getting any error, seems like a socket has been created. But it stuck at the packet line. 

I am attaching the logs of both the wire server and wire client, and the script too for you to review. (by setting the DEBUG_LOGGING to 1).

Please have a look at it. 

Thanks

- Ibtisam

[Neal Cardwell]

Hi,

Sorry for the delay. I have pushed a commit to the packetdrill repo that should hopefully fix the handling of UDP packets in remote mode. Can you please fetch the latest code from https://github.com/google/packetdrill and see if this fixes your issue? If it does not, then can you please share the script you are using and any output you see? 

Thanks!

neal