Sending HTTP POST with php cURL
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As promised previously, I’m going to show you how to send HTTP POST request using php cURL extension.
The target form
Let’s say you have a html form like this :
And this is the source code of the html file :
You can see that the form will submit the query using HTTP POST to “target.php”. Now let’s say you want to write a php script (bot.php) that will automatically send the query bypassing the html form, this is one way to do it (with php libcurl extension)
< ?php //bot.php $url = "http://localhost/wtf/target.php"; $ch = curl_init(); // set the target url curl_setopt($ch, CURLOPT_URL,$url); // howmany parameter to post curl_setopt($ch, CURLOPT_POST, 1); // the parameter 'username' with its value 'johndoe' curl_setopt($ch, CURLOPT_POSTFIELDS,"username=johndoe"); $result= curl_exec ($ch); curl_close ($ch); print $result; ?>
This script will send a HTTP POST request to “target.php” pretending to be a real person sending the “username” parameter as “john doe”.
However this is not entirely convincing since the server side will automatically know that you are using a http script to send the HTTP POST request by analyzing the browser “user-agent” string. The default script will send “(HTTPRetriever/1.0)” as its user-agent.
With a little add-on, you can spoof the user-agent string inside your script just like this :
< ?php // // test HTTP POST submitter, using libcurl // // the target url which contains scripts that accepts post request $url = "http://localhost/wtf/target.php"; // we are spoofing Yahoo Seeker bot >:) $useragent="YahooSeeker-Testing/v3.9 (compatible; Mozilla 4.0; MSIE 5.5; http://search.yahoo.com/)"; $ch = curl_init(); // set user agent curl_setopt($ch, CURLOPT_USERAGENT, $useragent); // set the target url curl_setopt($ch, CURLOPT_URL,$url); // howmany parameter to post curl_setopt($ch, CURLOPT_POST, 1); // the parameter 'username' with its value 'johndoe' curl_setopt($ch, CURLOPT_POSTFIELDS,"username=johndoe"); // execute curl,fetch the result and close curl connection $result= curl_exec ($ch); curl_close ($ch); // display result print $result; ?>
so when your “bot.php” sends the request, the server logs will record that the query was sent by a “Yahoo Seeker bot” instead of a crudely coded php script.
You can spoof other browser as long as you know their user-agent string, refer to my previous post for a collection of browser user-agent strings.
No PHP cURL support?
In this case, you have a few options
- Use a server that support php cURL extension
- Compile/Install php cURL extension
- Use libcurlemu – php cURL extension written in pure php
Well that should cover the short crash course on how to use php cURL extension.
p/s : Although I won’t tell you how to write one directly, this is the basic of building spam bots and auto-submitter. So use your imagination (and the dark side of the force) to write the rest of the code. *evil*
You can download the source code of this tutorial here : http://mypapit.net/pub/libcurltest.zip
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February 28th, 2006 at 10:27 am
Sending HTTP POST with php cURL Feb 28, 2006 4:40 AM – Mypapit’s blog @ Computers Although I won?t tell you how to write one directly, this is the basic of building spam bots and auto-submitter. So use your imagination (and the dark side of the
February 28th, 2006 at 10:27 am
Sending HTTP POST with php cURL Feb 28, 2006 4:40 AM – Mypapit’s blog @ Computers Although I won?t tell you how to write one directly, this is the basic of building spam bots and auto-submitter. So use your imagination (and the dark side of the
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