Comparing output of a command with expected result during runtime

[Shivansh Rai]

Hi all,

I am currently working on a test script for handling RST from synchronised (established) state in a FreeBSD VM. What I am trying to do is verify whether we transit to CLOSED state after receiving a RST from the other side. Currently I am checking this using the following command -

`sockstat -s -P tcp -p 8080 | grep 'packetdril' | awk '{print $8}' | grep 'CLOSED'`

However, this simply prints CLOSED during the runtime or aborts in case of any discrepancy. I was wondering that is it possible for us to have some sort of assertion like logic where we can directly compare the output of a specific command with the expected result during the runtime. I am not aware of a method to do so in packetdrill.

The test script is available here : https://github.com/shivrai/TCP-IP-Regression-TestSuite/blob/master/reset/rst-synchronized-established.pkt

Any help will be appreciated.

Thank you.

Regards,

Shivansh

[Neal Cardwell]

Yes, you can use arbitrary shell commands within the back-ticks, so
you should be able to construct any arbitrary assertion-like logic you
need.

Hope that helps,
neal

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