#! /bin/bash
#***********************************************************************
#
# adsl-setup
#
# All-purpose slicing/dicing shell script to configure rp-pppoe.
#
# Copyright (C) 2000 Roaring Penguin Software Inc.
#
# $Id: adsl-setup.in,v 1.3 2001/04/02 13:59:14 dfs Exp $
#***********************************************************************

# Paths to programs and config files
IP=/sbin/ip
PPPD=/usr/sbin/pppd
PPPOE=/sbin/pppoe
ECHO=/bin/echo
LS=/bin/ls
ID=/usr/bin/id
NETWORKDIR=/etc/sysconfig/network-scripts
PAPFILE=/etc/ppp/chap-secrets
CHAPFILE=/etc/ppp/pap-secrets
RESOLVFILE=/etc/resolv.conf

# Set to "C" locale so we can parse messages from commands
LANG=C
export LANG

# Protect created files
umask 077

copy() {
    cp $1 $2
    if [ "$?" != 0 ] ; then
	$ECHO "*** Error copying $1 to $2"
	$ECHO "*** Quitting."
	exit 1
    fi
}

get_device() {
    if [ ! -d $NETWORKDIR ] ; then
        $ECHO "** $NETWORKDIR not found"
        $ECHO "** Quitting"
        exit 1
    fi

    cd $NETWORKDIR
    interfaces=$($LS ifcfg-ppp* 2>/dev/null | egrep -v '(~|\.bak)$' | \
                 egrep -v '(rpmsave|rpmorig|rpmnew)' | sed 's/^ifcfg-//g')

    for i in $interfaces ; do
        test -f ifcfg-$i && . ifcfg-$i 2>/dev/null
        if [ "$TYPE" = "xDSL" ] ; then
            device_count=$[$device_count+1]
            devices="$devices $DEVICE"
        fi
    done
}

clear_env() {
    unset USERCTL BOOTPROTO NAME DEVICE TYPE ONBOOT FIREWALL PING \
          PPPOE_TIMEOUT LCP_FAILURE LCP_INTERVAL CLAMPMSS CONNECT_POLL \
	  CONNECT_TIMEOUT DEFROUTE SYNCHRONOUS ETH PROVIDER USER PEERDNS \
	  DNS1 DNS2
}


clear

$ECHO "Welcome to the ADSL client setup.  First, I will run some checks on"
$ECHO "your system to make sure the PPPoE client is installed properly..."
$ECHO ""

# Must be root
if [ "`$ID -u`" != 0 ] ; then
    $ECHO "$0: Sorry, you must be root to run this script"
    exit 1
fi

# Must have pppd
if [ ! -x $PPPD ] ; then
    $ECHO "Oops, I can't execute the program '$PPPD'.  You"
    $ECHO "must install the PPP software suite, version 2.3.10 or later."
    exit 1
fi

# get the DSL config files in /etc/sysconfig/network-scripts
devices=""
device_count=0
get_device

if [ $device_count -gt 0 ] ; then
    $ECHO "The following DSL config was found on your system:"
    $ECHO ""
    $ECHO "  Device:      Name:"

    for i in $devices ; do
	. $NETWORKDIR/ifcfg-$i
	$ECHO "  $i         $NAME"
    done

    $ECHO ""

    for i in $devices ; do
	default_device=$i
	break
    done

    clear_env

    while [ true ] ; do
	$ECHO "Please enter the device if you want to configure the present DSL config"
	$ECHO -n "(default $default_device) or enter 'n' if you want to create a new one: "

	read dev

	if [ "$dev" = "n" ] ; then
	    i=0
	    while true; do
		found=0
		for j in $interfaces ; do
		    if [ "$j" = "ppp$i" ] ; then
			found=1
			break
		    fi
		done
		if [ $found -eq 0 ] ; then
		    dsl_device="ppp$i"
		    break
		fi
		i=$[$i+1]
	    done
            if [ -z "$dsl_device" ]; then
                dev=0
                while [ -e $NETWORKDIR/ifcfg-ppp$dev ]; do
                    dev=`expr $dev + 1`
                done
                dsl_device="ppp$dev"
            fi
	    break
	else
	    if [ -n "$default_device" ] ; then
		if [ -n "$dev" ] ; then
		    dsl_device="$dev"
		else
		    dsl_device="$default_device"
		fi
	    fi
	    for i in $devices ; do
		[ "$dsl_device" = "$i" ] && break
	    done
	    if [ "$dsl_device" = "$i" ] ; then
		break
	    fi
	    $ECHO "Device '$dsl_device' is not found in the list, please choose the correct one"
	fi
    done
else
    dev=0
    while [ -e $NETWORKDIR/ifcfg-ppp$dev ]; do
        dev=`expr $dev + 1`
    done
    dsl_device="ppp$dev"
fi

CONFIG="$NETWORKDIR/ifcfg-$dsl_device"
DEVICE=$dsl_device
[ "$dev" = "n" ] || . $CONFIG 2>/dev/null
[ "$DEMAND" = "" ] &&  DEMAND=no

while [ true ] ; do
    $ECHO ""
    $ECHO "LOGIN NAME"
    $ECHO ""
    if [ -z "$USER" ] ; then
	$ECHO -n "Enter your Login Name: "
    else
	$ECHO -n "Enter your Login Name (default $USER): "
    fi

    read U

    if [ -z "$U" ] ; then
	if [ -z "$USER" ] ; then
	    continue
	fi
    else
	USER="$U"
    fi


    # Under Linux, "fix" the default interface if eth1 is not available
    [ -n "$ETH" ] || ETH=eth0
    if test `uname -s` = "Linux" ; then
       $IP link show $ETH > /dev/null 2>&1 || ETH=eth0
    fi
    $ECHO ""
    $ECHO "INTERFACE"
    $ECHO ""
    $ECHO "Enter the Ethernet interface connected to the ADSL modem"
    $ECHO "For Solaris, this is likely to be something like /dev/hme0."
    $ECHO "For Linux, it will be ethX, where 'X' is a number."
    $ECHO -n "(default $ETH): "
    read E

    if [ -n "$E" ] ; then
	ETH="$E"
    fi

    $ECHO ""
    $ECHO "Do you want the link to come up on demand, or stay up continuously?"
    $ECHO "If you want it to come up on demand, enter the idle time in seconds"
    $ECHO "after which the link should be dropped.  If you want the link to"
    $ECHO "stay up permanently, enter 'no' (two letters, lower-case.)"
    $ECHO "NOTE: Demand-activated links do not interact well with dynamic IP"
    $ECHO "addresses.  You may have some problems with demand-activated links."
    $ECHO -n "Enter the demand value (default $DEMAND): "
    read D
    if [ -n "$D" ] ; then
	DEMAND="$D"
    fi

    $ECHO ""
    $ECHO "DNS"
    $ECHO ""
    $ECHO "Please enter the IP address of your ISP's primary DNS server."
    $ECHO "If your ISP claims that 'the server will provide dynamic DNS addresses',"
    $ECHO "enter 'server' (all lower-case) here."
    $ECHO "If you just press enter, I will assume you know what you are"
    $ECHO "doing and not modify your DNS setup."
    $ECHO -n "Enter the DNS information here: "

    read DNS1


    if [ -n "$DNS1" ] ; then
        if [ "$DNS1" != "server" ] ; then
	    $ECHO "Please enter the IP address of your ISP's secondary DNS server."
	    $ECHO "If you just press enter, I will assume there is only one DNS server."
	    $ECHO -n "Enter the secondary DNS server address here: "
	    read DNS2
	fi
    fi

    while [ true ] ; do
	$ECHO ""
	$ECHO "PASSWORD"
	$ECHO ""
	stty -echo
	$ECHO -n "Please enter your Password: "
	read PWD1
	$ECHO ""
	$ECHO -n "Please re-enter your Password: "
	read PWD2
	$ECHO ""
	stty echo
	if [ "$PWD1" = "$PWD2" ] ; then
	    break
	fi

	$ECHO -n "Sorry, the passwords do not match.  Try again? (y/n)"
	read ANS
	case "$ANS" in
	    N|No|NO|Non|n|no|non)
		$ECHO "OK, quitting.  Bye."
		exit 1
	esac
    done

    # Usercontrol
    $ECHO ""
    $ECHO "USERCTRL"
    $ECHO
    $ECHO "Please enter 'yes' (three letters, lower-case.) if you want to allow"
    $ECHO -n "normal user to start or stop DSL connection (default yes): "

    read USERCTL

    if [ -z "$USERCTL" ] ; then
	USERCTL="yes"
    fi

    # Firewalling
    $ECHO ""
    $ECHO "FIREWALLING"
    $ECHO ""
    if test `uname -s` != "Linux" ; then
	$ECHO "Sorry, firewalling is only supported under Linux.  Consult"
	$ECHO "your operating system manuals for details on setting up"
	$ECHO "packet filters for your system."
	FIREWALL=NONE
    else
	$ECHO "Please choose the firewall rules to use.  Note that these rules are"
	$ECHO "very basic.  You are strongly encouraged to use a more sophisticated"
	$ECHO "firewall setup; however, these will provide basic security.  If you"
	$ECHO "are running any servers on your machine, you must choose 'NONE' and"
	$ECHO "set up firewalling yourself.  Otherwise, the firewall rules will deny"
	$ECHO "access to all standard servers like Web, e-mail, ftp, etc.  If you"
	$ECHO "are using SSH, the rules will block outgoing SSH connections which"
	$ECHO "allocate a privileged source port."
	$ECHO ""
	while [ true ] ; do
	    $ECHO "The firewall choices are:"
	    $ECHO "0 - NONE: This script will not set any firewall rules.  You are responsible"
	    $ECHO "          for ensuring the security of your machine.  You are STRONGLY"
	    $ECHO "          recommended to use some kind of firewall rules."
	    $ECHO "1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation"
	    $ECHO "2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway"
	    $ECHO "                for a LAN"
	    $ECHO -n "Choose a type of firewall (0-2): "
	    read a
	    if [ "$a" = 0 -o "$a" = 1 -o "$a" = 2 ] ; then
		break
	    fi
	    $ECHO "Please enter a number from 0 to 2"
	done

	case "$a" in
	    0)
		FIREWALL=NONE
		;;
	    1)
		FIREWALL=STANDALONE
		;;
	    2)
		FIREWALL=MASQUERADE
		;;
	esac
    fi

    $ECHO ""
    $ECHO "Start this connection at boot time"
    $ECHO ""
    $ECHO "Do you want to start this connection at boot time?"
    $ECHO -n "Please enter no or yes (default no):"
    read boot
    case "$boot" in
      yes|YES) ONBOOT="yes";;
      *) ONBOOT="no";;
    esac

    $ECHO ""
    $ECHO "** Summary of what you entered **"
    $ECHO ""
    $ECHO "Ethernet Interface: $ETH"
    $ECHO "User name:          $USER"
    if [ "$DEMAND" = "no" ] ; then
	$ECHO "Activate-on-demand: No"
    else
	$ECHO "Activate-on-demand: Yes; idle timeout = $DEMAND seconds"
    fi

    if [ -n "$DNS1" ] ; then
        if [ "$DNS1" = "server" ] ; then
	    $ECHO "DNS addresses:      Supplied by ISP's server"
        else
	    $ECHO "Primary DNS:        $DNS1"
	    if [ -n "$DNS2" ] ; then
		$ECHO "Secondary DNS:      $DNS2"
	    fi
        fi
    else
	$ECHO "DNS:                Do not adjust"
    fi
    $ECHO "Firewalling:        $FIREWALL"
    $ECHO "User Control:       $USERCTL"
    while [ true ] ; do
        $ECHO -n 'Accept these settings and adjust configuration files (y/n)? '
        read ANS
	case "ANS" in
	    Y|y|yes|Yes|oui|Oui)
		ANS=y
		;;
            N|n|no|No|non|Non)
		ANS=n
		;;
	esac
	if [ "$ANS" = "y" -o "$ANS" = "n" ] ; then
	    break
        fi
    done
    if [ "$ANS" = "y" ] ; then
	break
    fi
done

# Adjust configuration files.  First to $CONFIG

$ECHO "Adjusting $CONFIG"

test -f $CONFIG && copy $CONFIG $CONFIG.bak
if [ "$DNS1" = "server" ] ; then
    DNS1=""
    DNS2=""
    PEERDNS=yes
else
    PEERDNS=no
fi

# Where is pppd likely to put its pid?
if [ -d /var/run ] ; then
    VARRUN=/var/run
else
    VARRUN=/etc/ppp
fi

$ECHO "USERCTL=$USERCTL" >$CONFIG
$ECHO "BOOTPROTO=dialup" >>$CONFIG
[ -z "$NAME" ] && NAME="DSL$DEVICE"
$ECHO "NAME=DSL$DEVICE" >>$CONFIG
$ECHO "DEVICE=$DEVICE" >>$CONFIG
$ECHO "TYPE=xDSL" >>$CONFIG
$ECHO "ONBOOT=$ONBOOT" >>$CONFIG
$ECHO "PIDFILE=/var/run/pppoe-adsl.pid" >>$CONFIG
$ECHO "FIREWALL=$FIREWALL" >>$CONFIG
[ -z "$PING" ] && PING="."
$ECHO "PING=$PING" >>$CONFIG
[ -z "$PPPOE_TIMEOUT" ] && PPPOE_TIMEOUT=80
$ECHO "PPPOE_TIMEOUT=$PPPOE_TIMEOUT" >>$CONFIG
[ -z "$LCP_FAILURE" ] && LCP_FAILURE=3
$ECHO "LCP_FAILURE=$LCP_FAILURE" >>$CONFIG
[ -z "$LCP_INTERVAL" ] && LCP_INTERVAL=20
$ECHO "LCP_INTERVAL=$LCP_INTERVAL" >>$CONFIG
[ -z "$CLAMPMSS" ] && CLAMPMSS=1412
$ECHO "CLAMPMSS=$CLAMPMSS" >>$CONFIG
[ -z "$CONNECT_POLL" ] && CONNECT_POLL=6
$ECHO "CONNECT_POLL=$CONNECT_POLL" >>$CONFIG
[ -z "$CONNECT_TIMEOUT" ] && CONNECT_TIMEOUT=60
$ECHO "CONNECT_TIMEOUT=$CONNECT_TIMEOUT" >>$CONFIG
[ -z "$DEFROUTE" ] && DEFROUTE=yes
$ECHO "DEFROUTE=$DEFROUTE" >>$CONFIG
[ -z "$SYNCHRONOUS" ] && SYNCHRONOUS=no
$ECHO "SYNCHRONOUS=$SYNCHRONOUS" >>$CONFIG
$ECHO "ETH=$ETH" >> $CONFIG
[ -z "$PROVIDER" ] && PROVIDER="$NAME"
$ECHO "PROVIDER=$PROVIDER" >>$CONFIG
$ECHO "USER=$USER" >>$CONFIG
$ECHO "PEERDNS=$PEERDNS" >>$CONFIG
$ECHO "DEMAND=$DEMAND" >>$CONFIG

if [ -n "$DNS1" ] ; then
    if [ "$DNS1" != "server" ] ; then
	$ECHO "Adjusting $RESOLVFILE"
	if [ -r $RESOLVFILE ] ; then
	    grep -s "MADE-BY-RP-PPPOE" $RESOLVFILE > /dev/null 2>&1
	    if [ "$?" != 0 ] ; then
		$ECHO "  (But first backing it up to $RESOLVFILE.bak)"
		test -f $$RESOLVFILE && copy $RESOLVFILE $RESOLVFILE.bak
	    fi
	fi
	$ECHO "# MADE-BY-RP-PPPOE" > $RESOLVFILE
	$ECHO "nameserver $DNS1" >> $RESOLVFILE
	if [ -n "$DNS2" ] ; then
	    $ECHO "nameserver $DNS2" >> $RESOLVFILE
	fi
    fi
fi

$ECHO "Adjusting $PAPFILE and $CHAPFILE"
if [ -r $PAPFILE ] ; then
    $ECHO "  (But first backing it up to $PAPFILE.bak)"
    test -f $PAPFILE && copy $PAPFILE $PAPFILE.bak
else
    cp /dev/null $PAPFILE.bak
fi
if [ -r $CHAPFILE ] ; then
    $ECHO "  (But first backing it up to $CHAPFILE.bak)"
    test -f $CHAPFILE && copy $CHAPFILE $CHAPFILE.bak
else
    cp /dev/null $CHAPFILE.bak
fi

egrep -v "^$USER|^\"$USER\"" $PAPFILE.bak > $PAPFILE
$ECHO "\"$USER\"	*	\"$PWD1\"" >> $PAPFILE
egrep -v "^$USER|^\"$USER\"" $CHAPFILE.bak > $CHAPFILE
$ECHO "\"$USER\"	*	\"$PWD1\"" >> $CHAPFILE

$ECHO ""
$ECHO ""
$ECHO ""
$ECHO "Congratulations, it should be all set up!"
$ECHO ""
$ECHO "Type '/sbin/ifup $dsl_device' to bring up your xDSL link and '/sbin/ifdown $dsl_device'"
$ECHO "to bring it down."
$ECHO "Type '/sbin/adsl-status $NETWORKDIR/ifcfg-$dsl_device'"
$ECHO "to see the link status."
$ECHO ""

exit 0