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ROPE Language Reference - "no"

The "no" action terminates the script (or expect_one, or eval block), indicating that the match has failed (ie: no match found).

For example:

lift(4) "HTTP" ne no

This lifts four bytes from the packet at $offset and compares them with the string "HTTP". If they are not the same, then the script terminates, returning a "no match" status to Iptables.

By the way .. the expect_str action can be used to achieve exactly the same goal as this example, as in..

expect_str( "HTTP" )

ROPE Language Reference - "no"

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