[hobbit] Testing external web through a proxy

Tue Nov 25 04:05:18 CET 2008

Of course it wasn't the whole script, but it still worked. :-)
I then tweaked it a little to make it work better for our environment, and added a few features, like the time_total.
I haven't implemented a timeout value though, although that's probably a good idea.

What you gave me was a skeleton, and after I added a bit of flesh, I ended up with something quite workable.
Which worked great. Thanks :-)

Here's one that Henrik might need to address though.

If I use curl to replace the standard http test, then I can't get it to graph unless I use the NCV feature.
However, I am reluctant to try this, because it might break other HTTP tests that are working well (on internal sites)

Is it OK to start graphing this using NCV, or is there a way to get the custom curl-based http test to inject the data points into the standard http graphing system?

Cheers
     Vernon

________________________________
From: Ralph Mitchell [mailto:ralphmitchell at gmail.com]
Sent: Tuesday, 25 November 2008 1:04 AM
To: hobbit at hswn.dk
Subject: Re: [hobbit] Testing external web through a proxy

Heh - dude, that wasn't supposed to be the *whole* script...  :)

If that one was useful, here's something that may be a bit better.  I added a timeout for curl, otherwise it'll wait for a long time if the server doesn't respond.  Also, this format produces a message formatted just like Xymon's internal http test, including the time taken to grab the headers.  You could extract the "Seconds" line to determine if the response is a bit slow.  With a bit more magic in Xymon's configs, you could even graph it...

Ralph Mitchell

============= cut here ============
#!/bin/sh

TESTHOST=www.google.com<http://www.google.com>
TESTURL=http://$TESTHOST/

TIMEOUT=30

# Grab *just* the headers, simulating Xymon's builtin http check
MESSAGE=`curl -x http://ourproxy.ourdomain.com:8080 \
     --proxy-anyauth -U hobbituser:hobbitpassword \
     -m $TIMEOUT \
     -w 'Seconds:     %{time_total}\n' \
     -s -S -L -I $TESTURL | $GREP -v Set-Cookie`

if [ "$?" -eq "0" ]; then
  COLOR=green
else
  COLOR=red
fi

# convert dots to commas in the hostname
MACHINE=`echo $TESTHOST | $SED -e 's/\./\,/g'

$BB $BBDISP "status $MACHINE.home $COLOR `date`

$MESSAGE"
============= cut here ============

On Sun, Nov 23, 2008 at 9:04 PM, Everett, Vernon <Vernon.Everett at woodside.com.au<mailto:Vernon.Everett at woodside.com.au>> wrote:
Hi Ralph

This script works a treat.

Thanks
    Vernon

________________________________
From: Ralph Mitchell [mailto:ralphmitchell at gmail.com<mailto:ralphmitchell at gmail.com>]
Sent: Saturday, 22 November 2008 12:23 AM
To: hobbit at hswn.dk<mailto:hobbit at hswn.dk>
Subject: Re: [hobbit] Testing external web through a proxy

Looks like your proxy requires authentication via Kerberos or NTLM or GSS-Negotiate.  Dunno if Xymon can do those.  Luckily the curl tool (httpp://curl.haxx.se<http://curl.haxx.se>) *can* do those...  I haven't had to use them, but it should not be too hard to bang out an ext script to do the check.  Something along these lines:

     #!/bin/sh
     curl -x http://ourproxy.ourdomain.com:8080 \
           --proxy-anyauth -U hobbituser:hobbitpassword \
           -s -S -L -o /dev/null http://www.google.com/
     if [ "$?" -eq "0" ]; then
       COLOR=green
       MESSAGE="Pinged Google OK"
     else
       COLOR=RED
       MESSAGE="Failed to reach Google"
     fi
     $BB $BBDISP "status www,google,com.home $COLOR `date`
$MESSAGE"

Obviously that can be expanded quite a lot...  :)  Drop it somewhere on your Xymon server (maybe in server/ext) and set up a block in server/etc/hobbitlaunch.cfg to fire it off as often as you want.  You may need to give the full path for curl, which is probably /usr/bin/curl.

Ralph Mitchell

On Fri, Nov 21, 2008 at 1:30 AM, Everett, Vernon <Vernon.Everett at woodside.com.au<mailto:Vernon.Everett at woodside.com.au>> wrote:
Hi all

I am trying to test our interent connectivity by checking Google through our proxy.
(Once I get this right, I want to start testing some of our external web pages in the same manner)

I have configured this in bb-hosts
0.0.0.0<http://0.0.0.0>         www.google.com<http://www.google.com>          # noconn http://hobbituser:hobbitpassword@ourproxy.ourdomain.com:8080/http://www.google.com

And I get this.
yellow<http://hobbit/hobbit/gifs/yellow.gif> http://www.google.com.au/ - Proxy Authentication Required

HTTP/1.1 407 Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  )
Via: 1.1 PXYHOSTNAME
Proxy-Authenticate: Negotiate
Proxy-Authenticate: Kerberos
Proxy-Authenticate: NTLM
Connection: Keep-Alive
Proxy-Connection: Keep-Alive
Pragma: no-cache
Cache-Control: no-cache
Content-Type: text/html
Content-Length: 4118

Seconds:     0.02

Any assistance appreciated.

Regards
    Vernon

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