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Joe_Erchul_4263's avatar
Joe_Erchul_4263
Icon for Nimbostratus rankNimbostratus
Nov 16, 2015

Search a URI for ~ followed by a number?

Gang,

 

Running 11.5.3 on my LTMs, and I'm trying to find an iRule that will block access to any URI that begins with "/this_is_where_I_start/", then contains "~any_number" within the URI. For instance, I'd like to block "http://thisismysite.com/this_is_where_I_start/lots_of_directories/filename~1.fileextension" The key here is the ~1. Is the recommendation going with a regex variable, or a string variable?

 

Thanks in advance.

 

Joe

 

application delivery
iRules

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  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Nov 16, 2015

    is scan useful?

    e.g.

    % set u1 /this_is_where_I_start/lots_of_directories/filename~1.fileextension
/this_is_where_I_start/lots_of_directories/filename~1.fileextension
%
% set u2 /this_is_where_I_start/lots_of_directories/filename.fileextension
/this_is_where_I_start/lots_of_directories/filename.fileextension
%
% scan $u1 {%*[^~]~%d} num1
1
% put $num1
1
%
% scan $u2 {%*[^~]~%d} num2
0
  • Joe_Erchul_4263's avatar
    Joe_Erchul_4263
    Icon for Nimbostratus rankNimbostratus
    Nov 16, 2015

    Nitass,

     

    That looked pretty crazy. Here's what I came up with:

     

    when HTTP_REQUEST { if { [string tolower [HTTP::path]] starts_with "/this_is_where_I_start/" and [HTTP::uri] matches_regex {/~[0-9]}} { reject } }

     

    The iRule didn't bomb on me, so I'm going to apply it in my test environment. Do you see any potential gotchas there?

     

    Joe