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If I set up an HTML page with the following form:
<html>
<body>
<form action="upload_file.php"
method="post"
enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" />
<br />
<input type="submit" name="submit" value="Submit" />
</form>
</body>
</html>
I can upload a file to upload_file.php where I can handle it using a PHP script.
For testing purposes, I need to do the same using raw HTTP via a PuTTY session.
I can do a normal POST (just sending text data) this way:
POST /test_post.php HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 11
name=myname
How can I send a file this way?
609
If you paste the request from the clipboard into the PuTTY session (right mouse click does this in my configuration), then press enter, the entire request gets sent. You can use any text editor (Notepad, Vim, emacs, Kedit, etc.) to create the request and copy it to the clip board.
You have to use multipart content-type and encode the file data into hex/binary
Try the following in telnet:
POST /the_url HTTP/1.1
User-Agent: Mozilla
Host: www.example.com
Content-Length: xxxx
Content-Type: multipart/form-data; boundary=--------------------31063722920652
------------------------------31063722920652
Content-Disposition: form-data; name="a"
value_for_a
------------------------------31063722920652
Content-Disposition: form-data; name="b"
value_for_b
------------------------------31063722920652
Content-Disposition: form-data; name="c"; filename="myfile.txt"
Content-Type: text/plain
This is a test
and more
-----------------------------31063722920652
Content-Disposition: form-data; name="submit"
Submit
-----------------------------31063722920652--
Remember that an extra newline is necessary between field name and its data. Also, update the Content-Length value.
85
Open a port with netcat and save the incoming request:
nc -l -p 1090 > income-http.txt
Then modify your form to send the data to the netcat:
<form action="http://localhost:1090/upload_file.php"
method="post" enctype="multipart/form-data">
Submit the form from your browser. You can find the full raw request with the contents of the file in the income-http.txt file.
Saving the income-http.txt is an one-time activity. Later you can send the saved request out any times. Please note that you should edit the Host: header in the saved txt.
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