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From: Mark on 8 Jul 2010 04:35
Hello,

I need to implement a firmware upgrade from user-level application on an
embedded system. Currently it's done by means of embedded web server 'httpd'
with modifications by a chip maker, whose hardware we use. So below is
request sequence sent to a server by a web browser:

POST /upgrade.cgi HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/x-shockwave-flash, application/msword,
application/vnd.ms-powerpoint, application/vnd.ms-excel, */*
Referer: http://192.168.2.1/firmware.asp
Accept-Language: en
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;
InfoPath.2)
Host: 192.168.2.1
Content-Length: 341
Connection: Keep-Alive
Cache-Control: no-cache
Authorization: Basic OmFkbWlu

-----------------------------7da271f502f4
Content-Disposition: form-data; name="page"

firmware.asp
-----------------------------7da271f502f4
Content-Disposition: form-data; name="file"; filename="C:\test.txt"
Content-Type: text/plain

test file

-----------------------------7da271f502f4--

'test.txt' is supposed to be a binary image file to be sent over the board
for upgrade.


'httpd' has a handler registered to process upgrade.cgi, it looks up input
stream for "Content-Disposition" and then retrieves "name=file". As I
understand all the strings til "-----------------------------7da271f502f4"
are always invariable, but how to generate
"-----------------------------7da271f502f4" like strings ?

And at last: is my assumption right that it'd be sufficient to just make a
connection to a localhost web server, send the above displayed strings and
wait for some answers from http server?

--
Mark

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