#!/bin/bash

# this is a script which is executed after connecting the ppp interface.
# look at man pppd for details

# the followings parameters are available:
# $1 = interface-name
# $2 = tty-device
# $3 = speed
# $4 = local-IP-address
# $5 = remote-IP-address
# $6 = ipparam

if [ "$USEPEERDNS" ]; then

	if [ -x /sbin/resolvconf ]; then
		conf="# Generated by ppp for $1\n"
		[ -n "$DNS1" ] && conf="${conf}nameserver $DNS1\n"
		[ -n "$DNS2" ] && conf="${conf}nameserver $DNS2\n"
		echo -e "$conf" | resolvconf -a "$1"
	else
		# add the server supplied DNS entries to /etc/resolv.conf
		# (taken from debian's 0000usepeerdns)

		# follow any symlink to find the real file
		REALRESOLVCONF=$(readlink --canonicalize /etc/resolv.conf)
	
		if [ "$REALRESOLVCONF" != "/etc/ppp/resolv.conf" ]; then

			# merge the new nameservers with the other options from the old configuration
			{
			grep --invert-match '^nameserver[[:space:]]' $REALRESOLVCONF
			cat /etc/ppp/resolv.conf
			} > $REALRESOLVCONF.tmp

			# backup the old configuration and install the new one
			cp -dpP $REALRESOLVCONF $REALRESOLVCONF.pppd-backup
			mv $REALRESOLVCONF.tmp $REALRESOLVCONF
	
			# correct permissions
			chmod 0644 /etc/resolv.conf
			chown root:root /etc/resolv.conf
		fi
	fi

fi

if [ -x /etc/init.d/net.$1 ]; then
	if ! /etc/init.d/net.$1 --quiet status ; then
		export IN_BACKGROUND="true"
		/etc/init.d/net.$1 --quiet start
	fi
fi

[ -f /etc/ppp/ip-up.local ] && . /etc/ppp/ip-up.local "$@"

#######################################"
############ MODIFICATIONS################
#######################################

# Ajout de la route automatique vers le PPTP
# Gamez
# makeperl@gmail.com


# Parse de l'adresse ip
#
# parse_ip adresseip
# renvoie OCTET1 
#######################################
function parse_ip () {

local IP=$1

if [ -n "$IP" ]
then
	OCTET1IP=$(echo "$IP" | cut -d "." -f 1)
fi
}

# Detecte le masque reseau
# suivant OCTET1IP
# 
# renvoie IPROUTE // renvoie l'adresse réseau par defaut
# renvoie MASKROUTE //masque par defaut de la classe
######################################
function detect_mask() {

RETURNACTION="FALSE";

if [ -n "$OCTET1IP" ]
then
	case "$OCTET1IP" in
		10)
			IPROUTE="10.0.0.0";
			MASKROUTE="255.0.0.0";
			CIDR="8";
			RETURNACTION="TRUE";
			;;
		172)
			IPROUTE="172.16.0.0";
			MASKROUTE="255.255.0.0";
			CIDR="16";
			RETURNACTION="TRUE";
			;;
		192)
			IPROUTE="192.168.0.0";
			MASKROUTE="255.255.255.0";
			CIDR="24";
			RETURNACTION="TRUE";
			;;
		*)
			RETURNACTION="FALSE";
			;;
	esac
fi
}

DEV=$1;
LOCALIP=$4;
LOGFILE='/var/log/logRoute';
FORMATDATE='%d/%m/%Y-%T';

if [ -n "$LOCALIP" ] # if the local ip address is present
then
	parse_ip $LOCALIP;
	if [ -n "$OCTET1IP" ] # if we have the first octet
	then
		detect_mask $OCTET1IP ;
		if [ -n "$RETURNACTION" ] && [ "$RETURNACTION" != "FALSE" ] # if we have the mask
		then
			route add -net $IPROUTE netmask $MASKROUTE dev $DEV
			echo "`date +$FORMATDATE` Routing $IPROUTE/$CIDR via $DEV" >> $LOGFILE;
		else
			echo "`date +$FORMATDATE` Searching mask failled" >> $LOGFILE;
		fi
	else
		echo "`date +$FORMATDATE` The first octet is not found" >> $LOGFILE;
	fi
else
	echo "`date +$FORMATDATE` Local ip of the VPN connection is not found" >> "$LOGFILE";
fi