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| Using echo, netcat(nc) and tr to create an HTTP connection https://forum.ivorde.com/using-echo-netcat-nc-and-tr-to-create-an-http-connection-t62.html |
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| Author: | debuser [ Thu Mar 04, 2010 5:01 am ] |
| Post subject: | Using echo, netcat(nc) and tr to create an HTTP connection |
Fortunately for debugging HTTP connections, there is a very simple way of generating one from command line when elinks or lynx are not available. For this we need the most basic http command and header: GET/POST and Host. Code: # echo 'GET / HTTP/1.1 Host: www.mysite.ro' GET / HTTP/1.1 Host: www.mysite.ro but the above output is not valid for sending it to a web server. We need some new lines added to it: Code: # echo 'GET / HTTP/1.1BHost: www.mysite.roB' | tr "B" "\n" GET / HTTP/1.1 Host: www.mysite.ro Now I'll take the above output (where tr replaced the B (uppercase B) with a new line) and inject it into a webserver using netcat (nc): Code: # echo 'GET / HTTP/1.1BHost: www.mysite.roBB' | tr "B" "\n" | nc localhost 80 HTTP/1.1 200 OK Date: Thu, 04 Mar 2010 08:56:15 GMT Server: Apache/2.2.13 (Unix) DAV/2 mod_ssl/2.2.13 OpenSSL/0.9.8k Set-Cookie: 0b1edb316356a304958c8070b6cd7673=8c2a000573ba9f66fc2379fbcf4b3fda; path=/ P3P: CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM" Expires: Mon, 1 Jan 2001 00:00:00 GMT Last-Modified: Thu, 04 Mar 2010 08:56:15 GMT Cache-Control: post-check=0, pre-check=0 Pragma: no-cache Connection: close ...rest of the output is ommited... What appears below my command is the webserver's output to the http GET command and the HOST header. P.S.: In this case, www.mysite.ro is not hosted and the webserver serves the default vhost. |
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