[NCLUG] regex for snmp

[Charles Clarke]

Sounds like you want to split on \n's followed by system. (or whatever
is the base of what you are walking)

Not sure about php, but in perl it would be something like:
@array = split(/^system\./mis, $string);

You could even do a:
$base = 'community'; (or whatever)
@array = split(/^$base\./mis, $string);

charles

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On Wed, 21 Nov 2001, mike cullerton wrote:

> hey folks,
> 
> a couple of clarifications about all this.
> 
> i am using php, not perl. (php allows either perl or posix regex's)
> 
> other comments inline...
> 
> on 11/21/01 9:59 AM, Mike Loseke at mike at verinet.com wrote:
> > Thus spake mike cullerton:
> 
> >> so, i would like to break up
> >> 
> >> system.sysName.0 = gw system.sysLocation.0 = fort collins
> > 
> > How are you getting all your info on one line? snmpwalk for me dumps one
> > entry per line (to STDOUT anyway).
> 
> the results are all on one line because i'm a dork and forgot that my web
> browser doesn't care about \n's, oops! :)
> 
> they are all on separate lines!
> 
> i still can't split on the \n though, because stuff 'on the right' can have
> any number of \n's. splitting on \n was my original attempt at solving this
> problem. oh well, back to the drawing board. atleast now, i can anchor the
> beginning of line. maybe it'll all fall in place.
> 
> > 
> > Ideers: you could (assuming reading one line at a time) dump everything
> > into a hash then loop around inside the hash.
> 
> this is the idea i was trying to reach.
> 
> > 
> > You sould also use the SNMP module for perl to do queries on a particular
> > string - much faster to grab a few known strings than to do an snmpwalk.
> > Dumping the whole MIB can take time on busy routers whereas queries are
> > much faster. I have several jobs that query machines and routers (average 2
> > queries per machine, up to 200 machines per job, average run is under a
> > minute).
> 
> dude, give me some credit ;)
> 
> i'm not walking the whole MIB. walking parts of the MIB can be useful
> though. like 
> 
>  snmpwalk router community interfaces.ifTable.ifEntry.ifDescr
> 
> instead of something like
> 
>  $num_interfaces = `snmpget router community interfaces.ifNumber.0`;
> 
>  for ($i=1;$i<= $num_interfaces;$i++) {
>   snmpget router community interfaces.ifTable.ifEntry.ifDescr.$i
>  }
> 
> both of these give me a list of interface descriptions, just in a different
> way. ultimately though, one must loop thru the responses some time.
> 
> > 
> > Whatya doin? huh? huh? :-) Pre-turkey day at work, looking for something
> > to do to pass the time.
> 
>  pre turkey day at home actually. i'm avoiding my day before turkey day
> responsibilities and feeding my hacking jones instead.
> 
>  been thinking about snmp a bunch lately, moving some of my home network
> monitoring from my linux box to my macosx box and decided to create a couple
> functions to help me out. back in the day when my local perl guru was just a
> spitwad away, i used perl for all this stuff and now i'm trying to relearn
> it...
> 
>  besides, i love regexes (and yes evelyn, i have my Mastering Regular
> Expressions book handy :)
> 
> y'all have a day,
> mike
> 
>  -- mike cullerton   michaelc at cullerton dot com
> 
> 
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