Great Circle Associates Firewalls
(March 1998)
 

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Subject: Re: Monitoring Web Server
From: Roger Books <books @ mail . state . fl . us>
Date: Thu, 26 Feb 1998 10:03:21 -0500 (EST)
To: firewalls @ GreatCircle . COM
In-reply-to: <199802252125 . NAA18372 @ yginsburg . el . nec . com>
Reply-to: Roger Books <books @ mail . state . fl . us>

> > Does anyone know of a program that will monitor a web server (no ping,
> > but an actual access of the URL), and if the access doesn't work, page
> > me...
> > 
> > I would prefer a DOS, Win 3.X or WIN95 solution.  But will go to NT or
> > UNIX if need be.
> > 

You might check into BB (Big Brother).  This is mainly unix though.  If
you want to take a look at my (rewritten version) it's at:

http://www.geocities.com/Area51/Cavern/2371/

My version is all C and TCL/Scotty, I don't really think it will run
on NT without Mods.

The scotty http get pulls the info and stores it into a file, I send
it to /dev/null and just make sure the return value is valid.  You
could send it to a file and then verify the contents.

I do my paging with qpage on my Solaris box, but qpage also (I believe)
runs on Linux.

This is a little heavier duty system than what you are asking for, it
does http, snmp, tacacs, %full on disk, items in mail spool, etc etc.

Also, before anyone flames me, this, like the regular BB, counts on the
client not lieing about who it is.  I do some trivial checks to make
sure it isn't garbage and make sure the message isn't too long.  The
part that accepts the input from the clients runs from inetd, so you
should wrapper it.  It also does a few things like "retry for 10 minutes
before paging me after hours", "don't page me during network maintenance
time", page me if it comes back, etc etc.  The one thing I really need
to do though is not have it page me for everything when the local gateway 
goes down or the MAN in Tallahassee drops.  (Our network is bridged over
the MAN.)

Roger


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