From owner-freebsd-ipfw  Tue Mar 27  0:22: 6 2001
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From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>
Message-Id: <200103270821.AAA90749@gndrsh.dnsmgr.net>
Subject: Re: Scripting with IPFW
In-Reply-To: <3ABFB6CB.4A876CC2@ocsinternet.com> from Mikel at "Mar 26, 2001 04:38:19 pm"
To: mikel@ocsinternet.com (Mikel)
Date: Tue, 27 Mar 2001 00:21:51 -0800 (PST)
Cc: johnny.dang@johnnydang.net (Johnny Dang),
	FREEBSD-IPFW@FreeBSD.ORG (FreeBSD IpFW)
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> Hey man cool, hope you don't mind I had to try your script out and well I came
> up with this...thanks for sending back the code byte...
> 
> #!/bin/sh
> 
> oif=`ifconfig fxp0 |grep inet | head -1 | awk '{print $2}'`

Obviosly people have totally forgotten how to program in the
language of awk, so instead use 2 other tools to do what could
be done much cleaner:

	oif=`ifconfig fxp0 | awk '/inet/ {print $2; exit}'`

Remeber, that grep X | awk 'foo' can almost always be rewritten
in a cleaner style as simply awk '/X/ foo'.

> omask=`ifconfig fxp0 |grep inet | head -1 | awk '{print $4}'`
> iif=`ifconfig rl0 |grep inet | head -1 | awk '{print $2}'`
> imask=`ifconfig rl0 |grep inet | head -1 | awk '{print $4}'`

The also seemed to have forgotten about doing common value
replacement by variables (fxp0 and rl0 should be replaced
by $something, which I would have called $iif, but that is
in use for something I would have called $iip).

New code:
oif=fxp0
iif=rl0
oip=`ifconfig ${oif} | awk '/inet/ {print $2; exit}'`
omask=`ifconfig ${oif} | awk '/inet/ {print $4; exit}'`
iip=`ifconfig ${iif} | awk '/inet/ {print $2; exit}'`
imask=`ifconfig ${iif} | awk '/inet/ {print $4; exit}'`

onet=`cidr -q ${oif} -h ${omask} | awk '/network/ {print $3}'`
inet=`cidr -q ${iif} -h ${imask} | awk '/network/ {print $3}'`

> 
> onet=`cidr -q ${oif} -h ${omask} | grep network | awk '{print $3}'`
> inet=`cidr -q ${iif} -h ${imask} | grep network | awk '{print $3}'`
> 
> echo "onet=\"${onet}\""
> echo "oif=\"${oif}\""
> echo "omask=\"${omask}\""
> echo
> echo "inet=\"${inet}\""
> echo "iif=\"${iif}\""
> echo "imask=\"${imask}\""
> 
> 
> Cheers,
> Mikel
> 
> PS: cidr is a neat little util found in /usr/ports/net/cidr
> 
> 
> Johnny Dang wrote:
> 
> > Thanks you all (especially UNIX, SCANNER, Mikel, and Scott)... That is why
> > this FreeBSD is great... This line will do it (I can now base on this and
> > change to fix my need)...
> >
> > ifconfig de0 | grep "inet" | head -1 | awk '{print $2}'
> >
> > Thanks to you all... But why the orginal commands from Linux won't work on
> > FreeBSD?
> >
> > ifconfig de0 | grep "inet" | cut -d -f2 | cut -d " " -f1  ?
> >
> > Just for curiosity? Btw, I download the new RedHAT Wolverines and Mandrake
> > 8.0 and those GUI look like Lindows now. But my boss likes it !!!!!
> >
> > ++++++++++++++++++++++++++++++++++++++++++++++++++
> > "The instructions said to use Windows 98 or better,
> > so I installed FreeBSD...It is working now!..."
> > ++++++++++++++++++++++++++++++++++++++++++++++++++
> > Johnny Dang <Johnny.Dang@johnnydang.net>
> > Senior Network Engineer/MCSE + Internet
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-ipfw" in the body of the message
> 
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-ipfw" in the body of the message
> 


-- 
Rod Grimes - KD7CAX @ CN85sl - (RWG25)               rgrimes@gndrsh.dnsmgr.net

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