#!/bin/sh
#
#  ncf-ppp-2.4   *   Feb 1999   *   Jeff East (an972)
#
#	- bash script to install basic PPP files on a Linux system for
#	  connecting to the National Capital Freenet (NCF)
#	- this script is self-contained, and creates files in directories
#	  /etc and /etc/ppp
#
# Changes:
#	- text adjusted for easier reading
#	- slight change testing for ppp/chat installation
#	- link to ppp-ncf placed in /usr/local/bin
#	- setuid pppd in case your distribution needs it
#	- phone numbers now reflect changes made late February 1999

######################   install portion   ############################
echo ""

# test for running as root - else give error and quit
if [ "$UID" != "0" ]; then
    echo "** You are not root.  You must run this as root."
    echo "No changes were make to your system."
    exit
fi


# test for the pppd package
if [ ! -f "/usr/sbin/pppd" ]; then
    echo "** You don't have the 'pppd/chat' package installed.  You must"
    echo "   install this."
    echo "No changes were make to your system."
    exit
fi


# prompt for user's values
echo "                    NCF PPP install for Linux systems"
echo "                    ---------------------------------"
echo
echo "** You can abort (control-C) at any prompt, and your system will"
echo "   not be altered."
echo ""
echo "This script will not do any error checking on what you enter, so"
echo "make sure that you're careful.  In any event, you can re-run this"
echo "script later and overwrite your previous entries."
echo

echo -n "-- enter your Freenet login ID: "
read NCF_ID

echo -n "-- enter your Freenet password: "
read NCF_PASSWORD

echo "-- enter your modem device (without the '/dev/')"
echo -n "    (it might be 'modem' or 'ttyS1' or ...) : "
read MODEM_DEVICE

echo "-- enter a speed to operate your modem at"
echo "    (for modern modems, use a speed two or more times faster than its"
echo "    connection speed; ie use 38400 or 57600 for a '14400' modem)"
echo -n "    ?: "
read MODEM_SPEED

echo "-- enter an initialization string for your modem"
echo "    (it should enable hardware handshaking, not software handshaking;"
echo -n "    example: 'AT&F1M1' for a USR Sportster) : "
read MODEM_INIT_STRING

echo -n "-- do you want verbose debugging messages? (y/n) "
read TEMP
    if [ "$TEMP" = "y" ]; then
        DEBUG='-v'
    else
        DEBUG=''
    fi
echo -n "-- do you have call waiting on your phone line? (y/n) "
read TEMP
    if [ "$TEMP" = "y" ]; then
        CALL_WAITING='*70,' 
    else
        CALL_WAITING='' 
    fi

echo
echo "** I am now going to preserve your original files and make the new ones."
echo -n "** Hit <ENTER> to proceed, or <control-C> to abort. "
read TEMP

# rename old files (if they exist) to 'origfilename.orig'
# - WON'T overwrite an existing 'filename.orig' 
mv /etc/ppp/pap-secrets /etc/ppp/pap-secrets.orig 2> /dev/null
mv /etc/ppp/options /etc/ppp/options.orig 2> /dev/null
mv /etc/host.conf /etc/host.conf.orig 2> /dev/null
mv /etc/resolv.conf /etc/resolv.conf.orig 2> /dev/null


##########################   make the files   ##########################

cat - > /etc/ppp/ppp-ncf <<-EOF
	#!/bin/sh
	#  ppp-ncf
	#	- connect/disconnect to Freenet via PPP
	#	- calls the script /etc/ppp/freenet.dialer
	#	- command-line parameter (becomes variable 'LINE') can be: 
	#	  "help"/"-h" or "off"
	#	  or "slow", "fast", or "mitel" (see freenet.dialer), 
	#	- phone numbers reflect NCF changes late February 1999
	#	- password information stored in /etc/ppp/pap-secrets
	#	- user watches the /var/log/messages file for status

	LINE=\$1

	case \$LINE in
        	'help' | '-h' )
                	echo "Usage: \$0 [ slow | fast | mitel | off ]"
                	;;
    		'off' )
                	kill \`pidof -x freenet-dialer\`
                	kill -INT \`/sbin/pidof pppd\`
                	;;
        	* )
                	export LINE
                	insmod ppp 2> /dev/null
                	/usr/sbin/pppd user $NCF_ID connect /etc/ppp/freenet-dialer
                	# watch the connection process with 'tail'
                	# - you can comment this out later if you don't like it
                	tail -f /var/log/messages
                	;;
	esac
	EOF

cat - > /etc/ppp/freenet-dialer <<-EOF
	#!/bin/sh
	#freenet-dialer
	#		- dial using environment variable 'LINE'
	#		- phone numbers reflect NCF changes late February 1999

	MAX_REDIALS=50

	case \$LINE in
	    'slow' ) TELEPHONE=5201130 ;;
	    'fast' ) TELEPHONE=5207835 ;;
	    'mitel' ) TELEPHONE=2719768 ;;
	    * ) TELEPHONE=5207835 ;;		# default to fast modems
	esac

	# initialize modem
	/usr/sbin/chat $DEBUG TIMEOUT 3 '' '$MODEM_INIT_STRING' OK ''
	if [ "\$?" != "0" ]; then
	    exit 1
	fi

	# Dial telephone number until connection is made
	attempt=0
	while : ; do
	    attempt=\`expr \$attempt + 1\`
	    # dial and login
	    /usr/sbin/chat $DEBUG               \\
	        TIMEOUT         4               \\
	        ABORT           'BUSY'          \\
	        ABORT           'NO CARRIER'    \\
	        ABORT           'NO DIALTONE'   \\
	        ABORT           'RING'          \\
	        ABORT           'Command not found' \\
	        ''              'at'            \\
	        'OK'-+++-'OK'   'ath'           \\
	        'ath'           '\c'            \\
	        TIMEOUT         40              \\
	        OK              atdt$CALL_WAITING\$TELEPHONE \\
	        CONNECT         '\c'
	        # leave chat, and let pppd do PAP authentication

	    if [ "\$?" = "0" ]; then
	        # We connected! - exit script - pass '0' to pppd
	        exit 0
	    fi
	
	    if [ "\$attempt" = "\$MAX_REDIALS" ]; then
	        # We failed! - pass '1' to pppd
	        exit 1
	    fi	
	done
	EOF

cat - > /etc/ppp/pap-secrets <<-EOF
	# Secrets for authentication using PAP
	# client   server   secret    		IP addresses
	$NCF_ID	   *        $NCF_PASSWORD
	EOF

cat - > /etc/ppp/options <<-EOF
	/dev/$MODEM_DEVICE $MODEM_SPEED
	modem
	lock
	crtscts
	defaultroute
	asyncmap 0
	mtu 1500
	mru 1500
	ipcp-accept-local
	ipcp-accept-remote
	EOF

cat - > /etc/resolv.conf <<-EOF
	domain localhost
	search ncf.carleton.ca carleton.ca
	# Freenet DNS #1
	nameserver 134.117.137.1
	# Mitel DNS ?
	nameserver 209.89.174.193
	# Freenet DNS #2
	nameserver 134.117.136.24
	EOF

cat - > /etc/host.conf <<-EOF
	order hosts,bind
	multi on
	EOF


# change ownerships/permission on all files we created
chmod 755 /etc/ppp/ppp-ncf
chmod 755 /etc/ppp/freenet-dialer
chmod 600 /etc/ppp/pap-secrets
chmod 644 /etc/ppp/options
chmod 644 /etc/host.conf
chmod 644 /etc/resolv.conf
# make sure pppd has setuid bit set
chmod +s /usr/sbin/pppd
# allow all users to read /var/log/messages
chmod a+r /var/log/messages
# link to ppp-ncf in a common PATH directory
ln -s /etc/ppp/ppp-ncf /usr/local/bin/ppp-ncf

echo ""
echo "** Done.  Did you see any error messages?"