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Date:      Tue, 9 Jun 1998 15:02:16 -0600 (MDT)
From:      Atipa <freebsd@atipa.com>
To:        jktheowl@bga.com
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   NIS client maintenance script
Message-ID:  <Pine.BSF.3.96.980609145526.5230B-100000@altrox.atipa.com>
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Everyone,

You may find this script to be of use for NIS clients. It can be run from
crontab every minute or so to make sure NIS connections are up and
running. 

It disables NIS authentication during network failures, and
resets and enables NIS if the connection is restored.

Must be run as root. May work with /bin/sh, but I like bash better.

WARNING!!! This may modify your /etc/master.password file. If you can not
understand what it does, do not use it! :)

Kevin


-----
#!/usr/local/bin/bash

# This script maintains NIS client connections on simple networks
# Rev. 1.0, 05-09-98, Kevin McCarthy (kmcc@atipa.com)

# It disables NIS authentication during network failures, and resets
# and enables NIS if the connection is restored.

# User defined variables
nis_host="host.domain.tld"		# required
nis_domainname="freakazoid"		# required
ypbind_args="-s -ypsetme"		# -s for security
ypset_args="$nis_host"			# "" for no ypset

# Clearspace for readability
echo " "

# Find current state (bool) of NIS
nis_state=`grep + /etc/master.passwd && ps ax |grep yp`
if [ -n "$nis_state" ]; then
	echo NIS authentication is ON
else
	echo NIS authentication is OFF
fi

# Set up NIS conditional functions
function nis_down () {
	echo "Error: $nis_problem"

	if [ -n "$nis_state"]; then
		echo "Disabling NIS authentication"
        	umask 077
        	grep -v + /etc/master.passwd > /root/mp.nonis
        	mv /etc/master.passwd /etc/master.passwd.nis
        	mv /root/mp.nonis /etc/master.passwd
        	pwd_mkdb -p /etc/master.passwd
	else
		echo "NIS remaining disabled"
	fi

	exit 1
}

function nis_reset () {
	if [ -n "$nis_problem"]; then
		echo "Error: $nis_problem"
	fi

	echo -n "Resetting NIS services... "
	   killall ypbind >> /dev/null
	   domainname $nis_domainname
	   ypbind $ypbind_args
	   if [ -n "$ypset_args"]; then
		ypset $ypset_args
	   fi
	echo "Done"

	reset_done="true"
}

function nis_up () {
	if [ -z "$nis_state" ]; then
		echo "NIS services restored. Enabling NIS authentication" 
        	umask 077
        	mv /etc/master.passwd.nis /etc/master.passwd
        	pwd_mkdb -p /etc/master.passwd
	fi

	nis_working="true"
}

echo -n "Network connecion to $nis_host is "
up=`ping -c1 $nis_host | grep transmitted | awk -F, '{print $2}' \
        | awk '{print $1}'`
if [ "$up" = "1" ]; then
        echo ON
else
        echo OFF
	nis_problem="host not reachable (ping failed)"
	nis_down
fi

while [ -z "$nis_working" ]; do
	# Check if NIS is bound
	nis_bound=`ypwhich`

	if [ "$nis_bound" = "$nis_host" ]; then
		echo NIS binding to $nis_bound is ON
		nis_up
	else
		if [ -z "$reset_done" ]; then
			nis_problem="NIS binding to $nis_host is OFF" 
			nis_reset
		else
			echo "Reset Failed; disabling NIS services"
			nis_down
		fi
	fi
done

echo "Exiting"
echo " "


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