#!/bin/bash

#
#!F:isdn.dial
#
#!P:/usr/local/sbin
#
#!D:ISDN Dial trigger
#
#!C:Copyright 1997-1998 Peter Bieringer <pb@bieringer.de>
#
#!V:Version 2.26 11.05.1998

# Changes to
#  2.11: Deleting default route at stop is switched to delete all routes 
#         through ISDN device to preserve automatic dial-up
#  2.20: Changes for DLD 5.3, switching of resolver config files improved
#  2.21: Named-config-changer
#  2.22: Check online before hangup
#  2.23: Info display, minor changes
#  2.24: Now compatible to bind8
#  2.25: Displays BIND version
#  2.26: 'Stop' independed from being online to presere auto-dial-up, undo of 2.22
#         Also delete routes first, than hangup.


# Script file to delete all IPv4 routes through a specified interface
DELALLIP4ROUTES="/usr/local/sbin/delip4routes"

## Info for switching configuration files
# Switching named enabled?
NAMEDB_SWITCH=yes

# Get path of named
NAMEDPATH=`which named`

# Get major version number of named (4 or 8)
NAMEDMAJORVERSION=`strings $NAMEDPATH | grep "^@(#)named" | cut -d " " -f2 | cut -d "." -f1`


# Switching resolver enabled?
RESOLV_SWITCH=yes
RESOLV_ONLINE=/etc/resolv.conf.online
RESOLV_OFFLINE=/etc/resolv.conf

HOST_SWITCH=yes
HOST_ONLINE=/etc/host.conf.online
HOST_OFFLINE=/etc/host.conf

## Functions

# Display information
info() {
  grep "^#!D" $0 | awk -F: '{ print $2}'
  grep "^#!C" $0 | awk -F: '{ print " " $2}'
  grep "^#!V" $0 | awk -F: '{ print " " $2}'
  echo
}
    
# Check online
checkonline()
{
  if imontty | grep -i "outgoing" >/dev/null ; then
    # Online
    return 0
  else
    # Offline
    return 1
  fi 
}

showdialup()
{
  echo -n " Dial-up info:"
  imontty | grep -i "outgoing"
}

## Start

info

# Resource files
if [ "$NAMEDMAJORVERSION" = "4" ]; then
    NAMEDB_ONLINE=/etc/namedb/named.boot.online
    NAMEDB_OFFLINE=/etc/namedb/named.boot
    NAMEDB_ROOT=/etc/named.boot
    echo " Running BIND is version 4"
elif [ "$NAMEDMAJORVERSION" = "8" ]; then
    NAMEDB_ONLINE=/etc/namedb/named.conf.online
    NAMEDB_OFFLINE=/etc/namedb/named.conf
    NAMEDB_ROOT=/etc/named.conf
    echo " Running BIND is version 8"
fi


# Get options
OPTION_DEBUG=`echo $* | grep "\ -d" >/dev/null && echo 1`
OPTION_DEVICE=`echo $* | awk -F "-i " '{ print $2 }' | awk '{ print $1 }'`

if [ "$OPTION_DEBUG" = "1" ]; then
  echo " You choosed the DEBUG option - no real isdnctrl is done!"
fi

# Source function library.
[ -f /etc/init.d/functions ] || exit 0
. /etc/init.d/functions

# Source networking configuration.
[ -f /etc/sysconfig/network ] || exit 0
. /etc/sysconfig/network

# Source daemon configuration.
[ -f /etc/sysconfig/runservices ] || exit 0
. /etc/sysconfig/runservices

# Check that networking is up.
[ "$NETWORKING" = "yes" ] || exit 0

# Check that ISDN is up.
[ "$ISDN" = "yes" -o "$ISDN" = "YES" ] || exit 0

# Source ISDN 
[ -f /etc/sysconfig/isdn ] || exit 0
. /etc/sysconfig/isdn

[ -x /usr/sbin/isdnctrl ] || exit 0

# Check if ISDN is configured (isdn.init start)
if ! [ -f /var/lock/subsys/isdn ] ; then
	echo -e "\aNo ISDN Is Configured And Initialized Well!"
	exit 1
fi

# Choose Dial Device
if [ "$OPTION_DEVICE" = "" ] ; then
	DIALDEVICE=$ISDNDEV
else
	DIALDEVICE=$OPTION_DEVICE
fi

# Set dial tries
ISDNDIALMAX=$DIALMAX

# Reset in ipppd configuration
if ! [ "$OPTION_DEBUG" = "1" ]; then
  isdnctrl dialmax ${ISDNDEV} 1 >/dev/null 2>&1
fi

case "$1" in
  start)
	echo "Dial ISDN Device $DIALDEVICE"

	START=0
       	TRIES=0        
	DIALWAIT=10 # seconds     
	
	echo -n " Dial Up With $ISDNDIALMAX Tries:"

	while ! [ $TRIES = $ISDNDIALMAX ] ; do
    		# Trigger DialUp
                if ! [ "$OPTION_DEBUG" = "1" ]; then
		  isdnctrl dial $DIALDEVICE
                fi

		echo -n " Wait $DIALWAIT seconds"
		TRIES=$[ TRIES + 1 ]
		WAIT=0
		while ! [ $WAIT = $DIALWAIT ] ; do
			sleep 1
			WAIT=$[ WAIT + 1 ]
			echo -n "."

			# Check if online
			if checkonline; then 
				START=1
				if [ $START = 1 ] ; then break; fi; 	
			fi;
		done
		if [ $START = 1 ] ; then break; fi; 	
		echo "[$TRIES/$ISDNDIALMAX]"
	done

	if ! [ $START = 1 ] ; then 	
		echo -e "\a Dial Up Without Success!"
                if ! [ "$OPTION_DEBUG" = "1" ]; then
    		  isdnctrl hangup $DIALDEVICE
		  exit 1; 
                fi
	fi;

	echo -e "\n Dial Up Succeeded!"
   
	if [ $DIALDEVICE = $ISDNDEV ] ; then 
	    echo " Set Default-Route to ISDN"
	    route add default netmask 0.0.0.0 dev $DIALDEVICE

	    # Change software link to another resolv.conf,         	
	    # which has other DNS entries             	
	   
            if [ -f $RESOLV_ONLINE -a "$RESOLV_SWITCH" = "yes" ]; then
              # Make backup of the existing file
	      if [ -f /etc/resolv.conf ]; then
                mv /etc/resolv.conf /etc/resolv.conf.bak
              fi
					 	
	      echo "  Change 'resolv.conf' to PPP usage"
	      
              # Create new link	
              ln -f -s $RESOLV_ONLINE /etc/resolv.conf
            fi

	    # Change software link to another host.conf,         	
	    # which has other settings             	
	   
            if [ -f $HOST_ONLINE -a "$HOST_SWITCH" = "yes" ]; then
              # Make backup of the existing file
	      if [ -f /etc/host.conf ]; then
                mv /etc/host.conf /etc/host.conf.bak
              fi
					 	
	      echo "  Change 'host.conf' to PPP usage"
	      
              # Create new link	
              ln -f -s $HOST_ONLINE /etc/host.conf
            fi

	    # Change software link to another named.boot,         	
	    # which has other settings and reload named            	
   
            if [ "$NAMEDB_SWITCH" = "yes" ]; then
	      if [ -f $NAMEDB_ONLINE ]; then
                # Make backup of the existing file
	        if [ -f $NAMEDB_ROOT ]; then
                  mv $NAMEDB_ROOT $NAMEDB_ROOT.bak1
                fi
					 	
	        echo "  Change '$NAMEDB_ONLINE' to PPP usage"
	      
                # Create new link	
                ln -f -s $NAMEDB_ONLINE $NAMEDB_ROOT
	      fi
	      
              # Reload named
	      echo " Reload BIND:"
              ndc reload
            fi

	fi

        showdialup        
	
	echo "ISDN Device $DIALDEVICE Is Dialed Up"
	;;
  stop)
	echo "Hang Up ISDN Device $DIALDEVICE"

	if [ $DIALDEVICE = $ISDNDEV ] ; then 
	  echo " Delete all routes to ISDN device"
    	  $DELALLIP4ROUTES $DIALDEVICE
	fi

	echo -n " Hangup:"
	# HangUp
        if ! [ "$OPTION_DEBUG" = "1" ]; then
    	  isdnctrl hangup $DIALDEVICE
        fi
	
	echo -e "\n"

	if [ $DIALDEVICE = $ISDNDEV ] ; then 
	   
	  # Change software link to another resolv.conf,         	
	  # which has other DNS entries             	
	  if [ "$RESOLV_SWITCH" = "yes" ]; then 
            if [ -f $RESOLV_OFFLINE -a ! "$RESOLV_OFFLINE" = "/etc/resolv.conf" ]; then
              echo "  Change 'resolv.conf' to non-PPP usage"
	      if [ -L /etc/resolv.conf ]; then
	      
                # Create new link	
                ln -f -s $RESOLV_OFFLINE /etc/resolv.conf
              fi
            else
              # Copy backup back
              if [ -f /etc/resolv.conf.bak ]; then
		rm /etc/resolv.conf
                cp /etc/resolv.conf.bak /etc/resolv.conf
              fi
            fi
          fi

	  # Change software link to another host.conf,         	
	  # which has other settings             	
	  if [ "$HOST_SWITCH" = "yes" ]; then 
            if [ -f $HOST_OFFLINE -a ! "$HOST_OFFLINE" = "/etc/host.conf" ]; then
	      echo "  Change 'host.conf' to non-PPP usage"
	      if [ -L /etc/host.conf ]; then
	      
                # Create new link	
                ln -f -s $HOST_OFFLINE /etc/host.conf
              fi
	    else
              # Copy backup back
              if [ -f /etc/host.conf.bak ]; then
		rm /etc/host.conf
                cp /etc/host.conf.bak /etc/host.conf
              fi
            fi
          fi
	  
	  # Change software link to another named.boot,         	
	  # which has other settings             	
	    if [ "$NAMEDB_SWITCH" = "yes" ]; then
	      if [ -f $NAMEDB_OFFLINE ]; then
                # Make backup of the existing file
	        if [ -f $NAMEDB_ROOT ]; then
                  mv $NAMEDB_ROOT $NAMEDB_ROOT.bak2
                fi
					 	
       	        echo "  Change '$NAMEDB_ROOT' to non-PPP usage"
		
                # Create new link	
                ln -f -s $NAMEDB_OFFLINE $NAMEDB_ROOT
	      fi	
	      
            # Reload named
	    echo " Reload BIND"
            ndc reload
          fi

	fi

	echo "ISDN Device $DIALDEVICE Is Hanged Up"
	;;
  sleep)
	echo "Hang Up ISDN Device $DIALDEVICE, but route to ISDN is up (autodial)"
	
	# HangUp
        if ! [ "$OPTION_DEBUG" = "1" ]; then
	  isdnctrl hangup $DIALDEVICE
        fi

	echo "ISDN Device $DIALDEVICE Is Sleeping"
	
	;;
  *)
	echo "Syntax: isdn.dial {start|stop|sleep} <-i isdn-device> -d"
	exit 1
esac

exit 0