Welcome to evalpark!

evalpark is an AJAX service which runs a given shell script. The result is returned in JSON with Access-Control-Allow-Origin: *.

http://eval.dan.co.jp/park.cgi?s=source
https://eval.dan.co.jp/park.cgi?s=source

Your script is run in a fully-featured FreeBSD 13 jail with resources capped by RACCT/RCTL. Unlike many web services like this, Evalpark lets you run fully-featured shell scripts with pipe(), fork() and exec(). Thanks to RACCT which now comes standard with FreeBSD 9, This degree of freedom was made possible safely and securely.

Your script has 8.0 seconds to finish all tasks. If unfinished all processes are unconditionally killed.
Currently your script must be self-contained. No arguments. No STDIN (but you can still use <<HERE_DOCUMENT).
So long as your script behaves within the limits above, you are free to explore. You are even allowed to retrieve remote resources like so:
```
#!/bin/sh
fetch -o - https://example.com
```

To run other languages than /bin/sh, Just use shebang.

#!/usr/local/bin/perl
use strict;
use warnings;
use Data::Dumper;    
print Dumper \%ENV;

Since this is FreeBSD most programming languages are installed installed in /usr/local, not /usr. You can use which mylang to find the path. #!/usr/bin/env mylang also works.
most goodies are installed via pkg. You can easily check installed packages via pkg info.

Script Archive

Available in /friends/. You can also rerun the script by prepending /park.cgi. For example:

/friends/sample/boilerplate.sh: Gives you its source.
/park.cgi/friends/sample/boilerplate.sh: Gives you the executed result.

In fact, any submitted scripts are stored in /friends/yyyy/mm/dd/${sha256_hash_of_the_content}. You can get the path via path field of the JSON.

jQuery Plugin

jQuery plugin is available so you can easily run your scripts in your web page like so:

<script src="//ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="//eval.dan.co.jp/jquery-runpark.js"></script>
<div>
<textarea id="src" rows="4">
#!/bin/sh -v
pkg info | awk '{print $1}'
</textarea>
  <div>
    <input type="submit" value="run" onclick="$('#src').runPark('#dst')">
    <input type="submit" value="rerun" onclick="$('#dst').rerunPark('/friends/sample/pkg.sh')">
    <input type="submit" value="clear" onclick="$('#dst').html('')">
  </div>
  <div id="dst"></div>
</div>

jquery-runpark.js source is as follows:

NO WARRANTY

Whatsoever.

Enjoy!

Dan the Park Ranger

Acknowledgements

The FreeBSD Project for making the sandbox possible. Without jail and racct it would not be this easy.
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