#!/bin/sh
#
# echo "ppp-on-dialer gestartet">/dev/console
#
# file: /etc/ppp/redialer
#
# This script is based on the script "redialer" found at
# ftp://sunsite.unc.edu/pub/Linux/system/Network/serial/ppp/ppp-2.2.0f.tar.gz
# It should work with previous versions of chat too
# 
###################################################################
#
# These parameters control the attack dialing sequence.
#
# Maximum number of attempts to reach the telephone number(s)
MAX_ATTEMPTS=2

# Delay between each of the attempts (in seconds).
SLEEP_DELAY=5

# Terminal to echo output, exported from "ppp-on"
if [ "w$TERMINAL" = "w" ]; then
#   TERMINAL=/dev/ttyI0
   TERMINAL=/dev/console
fi

###################################################################
#
# This is a list of telephone numbers.

PHONE1=$TELEPHONE
#PHONE1=006332979290
#PHONE2=31420920
#PHONE3=31420988
#PHONE4=39991099
numbers=1

###################################################################
#
#ACCOUNT=ppp
#PASSWORD=OpenSesame
#
###################################################################
#
# Script to dial a telephone
# You probably have to change the initialization string 
# Check your modem manual

function callnumber
{

#echo "$ACCOUNT">$TERMINAL
#echo "$PASSWORD">$TERMINAL
#echo "$1">$TERMINAL

/usr/sbin/chat -v					\
	TIMEOUT		10				\
	ABORT		'\nBUSY\r'			\
	ABORT		'\nNO CARRIER\r'		\
	ABORT		'\nRING\r\n\r\nRING\r'		\
	ABORT 		'\nNO DIALTONE\r'		\
	ABORT		'\nERROR\r'			\
	''		'+++ATZ'			\
	OK 		'AT&E40'			\
	TIMEOUT		15				\
	OK		ATD$1 	 			\
	'CONNECT 64000/X.75' ''				\
	TIMEOUT		10				\
	ogin:--ogin:	$ACCOUNT			\
	assword:	$PASSWORD			\
	Starting PPP	''
#	assword:	$PASSWORD

#
# decide what to do depending on exitcode of chat
#
case $? in
   0) echo Connection established > $TERMINAL; exit 0;;
   1) echo chat: exit 1, see manpage for details. > $TERMINAL; exit 1;;
   2) echo chat: exit 2, see manpage for details. > $TERMINAL; exit 2;;
   3) echo chat: exit 3, see manpage for details. > $TERMINAL; exit 3;;
   4) echo Line busy. > $TERMINAL;;
   5) echo No Carrier. > $TERMINAL;;
   6) echo A call is coming. Exiting! > $TERMINAL; exit 1;;
   7) echo No dialtone. > $TERMINAL;;
   8) echo An error occured. Exiting! > $TERMINAL; exit 1;;
esac
return
}

###################################################################
#
# Function, that displays the rest of time before the next number 
# is dialed

function sleeping
{
REST=$SLEEP_DELAY
while [ $REST -ne 0 ]; do
   echo -ne Next trial in $REST seconds. "\r" > $TERMINAL
   sleep 1s
   REST=`expr $REST - 1`
done 
echo "Next trial now.         " "\r" > $TERMINAL
return
}

###################################################################
#
# Dial telephone numbers until one answers

attempt=0
while : ; do
   echo -e "\n" > $TERMINAL
   attempt=`expr $attempt + 1`
   echo "Dialing attempt number: $attempt" > $TERMINAL
   n=`expr $attempt % $numbers`
   if [ $n -eq 0 ]; then
      n=$numbers 
   fi
   NUMBER=`eval echo '$PHONE'$n`
   callnumber $NUMBER
   if [ $attempt -eq $MAX_ATTEMPTS ]; then
      exit 1
   fi	
   sleeping
done