php curl - 发布asp.net viewstate值

Question

I have the following code to login into an external site application (asp.net app) from a local site login form (written in php):

<?php
$curl_connection = curl_init('www.external.com/login.aspx');

curl_setopt($curl_connection, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($curl_connection, CURLOPT_USERAGENT,
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
curl_setopt($curl_connection, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl_connection, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, 1);

// Post data array
$post_data['LoginControl$UserName'] = 'ExampleUName';
$post_data['LoginControl$Password'] = 'ExamplePWord';

// Add form fields into an array to get ready to post
foreach ($post_data as $key => $value) 
  {
$post_items[] = $key . '=' . $value;
  }
$post_string = implode ('&', $post_items);

// Tell cURL which string to post
curl_setopt($curl_connection, CURLOPT_POSTFIELDS, $post_string);

// Execute and post
$result = curl_exec($curl_connection);
?>

I get directed to the login form of the external site instead of being directed to the application logged in. I think the problem is that I need to pass the viewstate values through, but i'm not sure how to go about doing that?

I don't have control over the external application. But we want users to be able to login to the application through our website, to maintain branding etc.

I've posted a couple of other threads recently about the use of php cURL, but I'm at the stage now where I think the viewstate is the problem ...

Thanks, Mark.

Answer 1

Change:

curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, 1);

To:

curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, false);

You also need to set up a cookie file, take a look at CURLOPT_COOKIEFILE

CURLOPT_COOKIEFILE:

The name of the file containing the cookie data. The cookie file can be in Netscape format, or just plain HTTP-style headers dumped into a file.

CURLOPT_COOKIE:

The contents of the "Cookie: " header to be used in the HTTP request. Note that multiple cookies are separated with a semicolon followed by a space (e.g., "fruit=apple; colour=red")

CURLOPT_COOKIEJAR:

he name of a file to save all internal cookies to when the connection closes.

@see http://www.php.net/manual/en/function.curl-setopt.php

curl_setopt($curl_connection, CURLOPT_COOKIEFILE, 'cookiefile.txt'); 
curl_setopt($curl_connection, CURLOPT_COOKIEJAR, 'cookiefile.txt');