php - use cUrl to upload a file to a form

Question

I need to send a file to a form using cUrl. The Site im sending this to, provided a cUrl command to upload the file, which works from the commandline but i cant get it to work with php curl.

Here is the cUrl command:

curl -x [<proxy_url>:<proxy_port>] -k -v --key key-<id>_nopw.pem --cacert ./ca_Zertifikat-<id>.pem --cert client_Zertifikat-<id>.pem -F upload=@C:\pathto\file.XML https://url.com/upload.php

And here is my php Code:

$ch = curl_init($url); curl_setopt($ch, CURLOPT_SSLKEY, $keyFile); curl_setopt($ch, CURLOPT_CAINFO, $caFile); curl_setopt($ch, CURLOPT_SSLCERT, $certFile); curl_setopt($ch, CURLOPT_VERBOSE, TRUE); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13'); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); $postdata = array(); $postdata['upload'] = realpath($filename); curl_setopt($ch, CURLOPT_POST, sizeof($postdata)); curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $result = curl_exec($ch); $error = curl_error($ch); curl_close($ch);

The response i'm getting from the Server amounts to:

"Error in transmission, no file has been uploaded"

I checked the message by manually trying the form and it means that no file has been chosen in the file dialog. What am i missing?

EDIT: This works, but i've been told this won't work on servers, since the probably block this:

exec('curl -k -v --key '.$keyFile.' --cacert '.$caFile.' --cert '.$certFile.' -F upload=@'.realpath($filename).' https://url.com/upload.php', $result);

Have you asked the "site" why this error occurs? In their documentation they might have error codes that match to your error — B001ᛦ
– B001ᛦ, Commented Sep 6, 2016 at 14:06
yeah, they said that that means i provided no file to be uploaded — Sebastian Rüttger
– Sebastian Rüttger, Commented Sep 6, 2016 at 14:09
Does your script work for uploading any image to another server? — B001ᛦ
– B001ᛦ, Commented Sep 6, 2016 at 14:11
i havn't tried that yet, but that form would be different, wouldn't it? — Sebastian Rüttger
– Sebastian Rüttger, Commented Sep 6, 2016 at 14:13
Possible duplicate of how to upload file using curl with php — gre_gor
– gre_gor, Commented Sep 6, 2016 at 14:15

Sebastian Rüttger · Accepted Answer · 2016-09-06 14:36:30Z

I found the solution. I had to change this:

$postdata['upload'] = realpath($filename);

to this line:

$postdata['upload'] = new CURLFile(realpath($filename), 'text/xml');

this changes from the old way to upload to the new. I had tried this approach before but i set the wrong MIME type, which ended up not working.

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