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Old 01-09-2009, 06:18 AM   #1
helptonewbie
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How to use tcpdump to be able to see http requests sent to the server?


Hi All,
Is it possible using tcpdump to display roughly the urls, or POST or GET data. I've got this command so far:-
tcpdump src host [ipaddress] and dst port http -XX

Which get output of:-
Code:
12:33:17.040750 IP [ipaddress].60667 > [hostname].http: P 5323:5952(629) ack 171139 win 65535 <nop,nop,timestamp 1016490840 153398489>
	0x0000:  0016 3e3e 19e7 0016 cbc9 b7ec 0800 4500  ..>>..........E.
	0x0010:  02a9 a308 4000 4006 39d7 ac16 0074 ac16  ....@.@.9....t..
	0x0020:  02cf ecfb 0050 fb7d f5d1 a513 528c 8018  .....P.}....R...
	0x0030:  ffff 3f52 0000 0101 080a 3c96 6b58 0924  ..?R......<.kX.$
	0x0040:  acd9 504f 5354 202f 6e61 6769 6f73 2f63  ..POST./nagios/c
	0x0050:  6769 2d62 696e 2f63 6d64 2e63 6769 2048  gi-bin/cmd.cgi.H
As you can see it displays part of the nagios URL there... what i'm trying to do is find out what POST/GET/URL nagios executes form the nagios web management when say clicking on the button in nagios that disables notifications for a specific host and service, etc. so unless there is another way to find this out, i'm trying to find the data i need by dumping the packet data. But not sure how i can get all the packet data i need from it. I can see small amount of the request but not all of it?

Cheers,
MJ

EDIT:- Well obviously i can see the PHP code page when clicking on the submit button is sending a POST, but i can't see all the entire request?

Last edited by helptonewbie; 01-09-2009 at 06:20 AM.
 
Old 01-09-2009, 06:36 AM   #2
acid_kewpie
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Well it says right there that it was a POST to that uri... isn't that *exactly* what you want? I think a -v should make it prettier, printing some level of formal decode compared to a dump. In general wireshark is a better option for elegantly pulling stuff like that apart.
 
Old 01-09-2009, 06:36 AM   #3
helptonewbie
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I've managed to get more data using the '-s' of tcpdump to not truncate output to 62 bytes as default but to capture whole packet. But this still didn't really give me the exact POST request that was sent. Perhaps i can't do what i want with this method?

Because at the end of the day i want to be able to in a script, run something like:-
curl --connect-timeout 4 --basic -u USER:PASSWORD http://NAGIOS/URL -d 'POST DATA'

To be able to start and stop notifications or checks using the nagios web page but via a script.

Last edited by helptonewbie; 01-09-2009 at 06:40 AM.
 
Old 01-11-2009, 04:27 PM   #4
acid_kewpie
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Something like a firefox extension may well be a simpler way to actually get the data in a useable form. plenty of developer extensions to track this sort of stuff.
 
Old 01-12-2009, 09:33 AM   #5
helptonewbie
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yes, perhaps that is a better method. I'll see what i can find. Cheers for the idea
 
  


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