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The web server's root and your OS's root are different. The web server won't look outside it's tree. If you write your image file to a location outside the server's DocumentRoot, your web server can't find it.

You can

  1. use the Alias directive to have a location point to some path outside the DocumentRoot
  2. allow the webserver process to write to some images directory inside the tree rooted at DocumentRoot
  3. use a CGI script to serve the image. Provide e.g. the tag
    <img src="/cgi-bin/$tag.jpg">
    in the page referencing the image, and have it served thusly:
    #!/usr/bin/perl -T use CGI; use strict; my $q = new CGI; if($q->param('img') =~ /^([\w\.\-]+)$/) { # untaint my $file = $1; if(-f "/tmp/$file") { if(open(I,'<',"/tmp/$file")) { print $q->header(-content_type => "image/jpeg"); print while <I>; close I; exit; } } } print $q->header(-status => '404 Not found'); print "<h1>Not found.</h1>\n";
As for 1. and 2. - if you allow your web server to write to some path, you should limit the methods POST, PUT and DELETE for that directory (or location).


_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In reply to Re: CGI-Perl:: Location for saving the GD output by shmem
in thread CGI-Perl:: Location for saving the GD output by cool

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