#!/bin/bash
###############################################################################
# This script sets a machine up to be an NIS client.
# Kevin Lister 10.28.98
###############################################################################

# Variables
logfile=/nisclient.log
me=${0##*/}

admin=cll-support@cup.hp.com
nisdomain=cll
domainname=
namesvrs=/etc/rc.config.d/namesvrs
nsswitch=/etc/nsswitch.conf
pwfile=/etc/passwd
lclpwfile=/etc/passwd.loc
nispwfile=/etc/passwd.nis
crontab=/var/spool/cron/crontabs/root
newcrontab=/tmp/root-crontab
null=/dev/null
ypdir=/var/yp

# Functions
function error {
  print -u2 "$me: Error: $1"
  /usr/bin/mailx -s "$(uname -n): NIS setup error: $1" $admin < $null
  #exit 255;
} # error

function warning {
  print -u2 "$me: Warning: $1"
} # warning

function display {
  print "$1"
} # display

function info {
  display "$me: Info: $1"
} # info

##
########## Main
##

##
########## Check the status of the system before proceeding
##

# Must be root to run this
if [ $(id -u) -ne 0 ]; then
        error "Must be root to execute this command... Exiting."
fi

# Check to see if this script has already been ran
if [ -a $logfile ]; then
        error "$me has already been ran on $(uname -n)... Exiting"
fi

# Check to see if domainname has been set
domainname=`/bin/domainname`
if [ "_$domainname" != "_" ]; then
        error "NIS Domain name is already set to -> $domainname... Exiting."
fi

# Are we already running NIS?
/usr/bin/ypwhich >> $logfile 2>&1
if [ $? -eq 0 ]; then
        error "This system is already running NIS... Exiting."
fi

# Check to see if there is a name service switch config file
if [ -a $nsswitch ]; then
        error "This system has a name service switch config file...  Exiting."
fi

# Check to see if /var/yp exists
if [ ! -a $ypdir ]; then
        error "Directory /var/yp does not exist... Exiting"
fi

##
########## System checks out. Set up the files and start NIS.
##

# Set the NIS domain name - This is probably not needed
/bin/domainname $nisdomain >> $logfile 2>&1
if [ $? -ne 0 ]; then
        error "Could not set NIS domain name... Exiting."
fi

# Setup the /etc/rc.config.d/namesvrs file
/usr/sbin/ch_rc -ap NIS_CLIENT=1 \
       -p NIS_DOMAIN=cll \
       -p YPBIND_OPTIONS="-ypsetme"

# Email us if there are local passwd entries other than root
if [ $( /bin/wc -l $lclpwfile | /bin/cut -d " " -f 1) != "1"  ]; then
        /usr/bin/mailx -s "$(uname -n): passwd.loc has more than 1 line" $admin < $lclpwfile
fi

# Create NIS passwd file
if [ -a $lclpwfile ]; then
        /bin/grep "^root" $lclpwfile > $nispwfile
else
        /bin/grep "^root" $pwfile > $nispwfile
fi

/bin/cat >> $nispwfile <<:END
adm:*:4:4::/usr/adm:/usr/bin/sh
anon:*:21:5:placeholder for future:/:/usr/bin/sync
bin:*:2:2::/usr/bin:/bin/sh
daemon:*:1:5::/:/usr/bin/sh
ftp:*:500:10:anonymous ftp:/home/ftp:/usr/bin/false
lp:*:9:7:[Line Printer]:/usr/spool/lp:/usr/bin/sh
nuucp:*:6:1:0000-uucp(0000):/usr/spool/uucppublic:/usr/lib/uucp/uucico
sync:*:20:1::/:/usr/bin/sync
tftp:*:510:1:Trivial FTP user:/usr/tftpdir:/usr/bin/false
uucp:*:5:3::/usr/spool/uucppublic:/usr/lib/uucp/uucico
who:*:90:1::/:/usr/bin/who
:END

/bin/grep -v "^root" $lclpwfile >> $nispwfile

/bin/cat >> $nispwfile <<:END2
-@dangerous-users
+@sysadmin
+@site-ux
+:
:END2

mv $pwfile $pwfile.preNIS
mv $nispwfile $pwfile
chmod 444 $pwfile
chown root:other $pwfile

# Remove MoA from the root crontab
sed -e "/MoA/d" -e "/mkpass/d" < $crontab > $newcrontab
mv $crontab $crontab-preNIS
/usr/bin/crontab $newcrontab
chmod 444 $crontab
chown root:other $crontab

# Start the NIS Client daemons
/sbin/init.d/nis.client start >> $logfile 2>&1
if [ $? -ne 0 ]; then
        error "Problem starting the NIS client daemons... Exiting."
fi

# Email us that a machine was updated
/usr/bin/mailx -s "$(uname -n): NIS setup complete" $admin < $null