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Walter_Kacynski's avatar
Walter_Kacynski
Icon for Cirrostratus rankCirrostratus
Feb 25, 2016

ASCII LF (0a) in STREAM

Is there a way to represent the hex 0a in the target of a STREAM::expression? Everything I try causes the literal "0a" or "\n" to be inserted instead of the representation of LF. STREAM::expressi...
application delivery
iRules
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Walter_Kacynski's avatar
Walter_Kacynski
Icon for Cirrostratus rankCirrostratus
Feb 25, 2016

In case someone else needs to perform a substitution on something not as simple as "\r" or "\n"... I just came up with this explanation...

With some guidance from https://devcentral.f5.com/wiki/iRules.TCP__payload.ashx and some confusion over when to use decimal or hex, I came up with the following solution

when CLIENT_ACCEPTED {
     Store hex 0a (Decimal of 10) as a binary format 
    set replacement [binary format c* {10}]
    STREAM::expression @\r@$replacement@
    STREAM::enable
}