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POsearch a php string for two substrings
 

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  1. POsearch a php string for two substrings
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    <p>I am programming a php program that will allow users to download audio from my website.<br/> To do this they go to <i>www.mysite.com/downloadit.php?file=myfile.mp3</i> and the download of <i>myfile.mp3</i> will begin immediately. <br/><br/>There is a problem though: I don't want people to be able to download system files. I am going to solve this by checking if <code>$_GET['file']</code> contains the substrings <code>.mp3</code> or <code>.wav</code>. I am trying to do this with the <code>strpos</code> command, but can't get it working. How would I check for more than one substring (.mp3 and .wav) in a string with <code>strpos</code>? Or maybe I should use a different command? Please let me know! <br/> Here is my code so far:<br/></p> <pre><code>$haystack=$_GET['file']; $resulting = strpos($haystack, ".mp3"); //if found $resulting will equal 1 //if not found $resulting will equal 0 //if $resulting is less than one then it must be 0 if($resulting &lt; 1){ //security breach! die("Unauthorized"); } //assuming we passed the last test, everything went well, we will then continue else{ //code here } </code></pre> <p>Thanks to @DoubleSharp i now have this completed code!!! <pre><code>//if it is found $resulting will not equal 0 //if it is not found $resulting will equal 0 //echo the result //echo $resulting; //add a line break echo "&lt;br/&gt;"; //if $resulting is less than one then it must be 0 //since it is 0 it must mean that it is a breach! if (preg_match("~\.(mp3|wav)$~i", $haystack)) { echo "hi nice file"; } else { die("bad file"); } ?&gt; </code></pre>
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    1. CO`substr_count()` and there you goooo. Though I have high doubts about the security ...
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      1. USHamZa
    2. COFor better security, consider maintaining a list of files that may be downloaded and comparing the input to that list. At the very least, limit accessible files to a particular directory or set of directories.
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      1. USGeorge Cummins
    3. COPeople are uploading audio onto my website all the time, mantaing that list would require a whole new set of code. This way would be much easier. This is just a backup security system really.... I have one in front of this that makes sure they don't download outside of the /audio/ directory. Thx though
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