On Thu, Feb 23, 2006 at 05:51:24PM -0700, andrew fresh wrote:
> Is it possible to get net-snmp's snmpd to return an interface
> description for ifAlias[1]? If so, how?
Well, nevermind, it got my interest up so here is a way that "works".
It doesn't check for bad input as well as it probably should. But the
stuff that is passed in is never actually used as a shell command so
although it might through some strange errors I don't think it is a
security risk.
However, cfgmaker from MRTG doesn't think that it should check for
ifAlias because there is no Vendor returned by default and so it can't
even attempt to match it. But, change cfgmaker to always query ifAlias
and w00 h00 my configs now have descriptions!
Anyway, mostly for the archives, here is how it ends up:
add something like this into your snmpd.conf
pass .1.3.6.1.2.1.31.1.1.1.18 /usr/local/libexec/ifAlias
and this script in /usr/local/libexec/ifAlias
--- BEGIN ---
#!/bin/sh
# $RedRiver: ifAlias,v 1.3 2006/02/24 03:47:59 andrew Exp $
BASE='.1.3.6.1.2.1.31.1.1.1.18'
# The whitespace here for the grep needs to be a tab
set -A INTERFACES `ifconfig | grep -v "^ " | sed 's/:.*$//'`
if [ "$1" = "-s" ]; then
#echo $* >> /tmp/passtest.log
exit 0
fi
REQ=$2
ID=${REQ##${BASE}.}
if [ "X${REQ}" = "X${BASE}" ]; then
ID=0
fi
if [ "$1" = "-n" ]; then
INDEX=$ID
ID=$(( $ID + 1 ))
else
INDEX=$(( $ID - 1 ))
fi
if [ "X$ID" = "X" ] || [ "X$ID" = "X0" ] || [ "X$ID" = "X-1" ]; then
exit 0
fi
INTERFACE=${INTERFACES[$INDEX]}
echo ${BASE}.${ID}
if [ "X${INTERFACE}" = "X" ]; then
echo noSuchName
exit 0
fi
echo "string"
echo `ifconfig ${INTERFACE} | grep description | \
sed -e 's/^.*description:.//'`
exit 0
--- END ---
l8rZ,
--
andrew - ICQ# 253198 - JID: [EMAIL PROTECTED]
Proud member: http://www.mad-techies.org
BOFH excuse of the day: The file system is full of it
