#!/bin/bash
# -------
# File:        lliurex-srv-netfix
# Description: Server /etc/network/interfaces configuration tool
# Author:      Luis Garcia Gisbert <garcia_luigis@gva.es>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston MA 02110-1301 USA
# --------

####################
#  DEFAULT VALUES  #
####################

NEW_IP=""
NEW_NETMASK=""
NEW_GATEWAY=""
NEW_NAMESERVER=""
NEW_EXTRADOMAIN=""
EXTERNAL=""
INTERNAL=""

#####################
#  BASIC FUNCTIONS  #
#####################


usage(){
	echo "lliurex-srv-netfix ETH [--internal|--external] -ip|-netmask|-gateway|-extra-ns|-extra-domain"
	exit 1
}

die(){

	echo "ERROR $1"
	exit 1

}



###############
#   FUNCTIONS #
###############

do_basic_fix(){

	llxcfg-setvars "SRV_NIC=$1" &>/dev/null 
	fix_interfaces "$1"

}

set_ip_netmask(){

	echo ""


}


is_valid_gw(){

	# If in the future this script fails, check the output format of the ipcalc.
	IP_NET=$(ipcalc_value Network "$NEW_IP" "$NEW_NETMASK" )
	GW_NET=$(ipcalc_value Network "$NEW_GATEWAY" "$NEW_NETMASK" )
	
	if [ "$IP_NET" = "$GW_NET" ] ;then
		return 0
	fi 
	return 1

}


#
# MAIN
#


[ "$1" ] || usage

LIB_FILE="/usr/share/lliurex/lliurex-srv-common/server-netfuncs.sh"
   [ -r "$LIB_FILE" ] || die "$LIB_FILE not found"
   source $LIB_FILE

[ $(id -u) -eq 0 ] || die "You mas be root, my friend"

# The first parameter is Ethernet?
ETH="$1"
shift

# If no more parameters than ETH is passed 
# we make a basic configuration of ETH

if [ -z "$1" ] ; then

        do_basic_fix "$ETH"
        exit 0
fi


is_ethernet_card "$ETH" || die "The first parameter must be a Ethernet Device"


# Now we must decide if ETH is Internal or External

if [ "$1" = "--external" ] ; then
	
	EXTERNAL="True"

elif [ "$1" = "--internal" ] ; then

	INTERNAL="True"

else  
	die "The Device must be internal or external"

fi

shift
# The others parameters 

while [ $# -ge 1 ] ; do
        case $1 in
		dhcp)
			DHCP="True"
			shift
			;;
	 	-ip)
			[ -z "$2" ] && usage 
	                NEW_IP=$2
        	        shift 2
			;;
		-netmask)[ -z "$2" ] && usage
	                NEW_NETMASK=$2
        	        shift 2
			;;
		-gateway)
			[ -z "$2" ] && usage
	                NEW_GATEWAY=$2
        	        shift 2
			;;
		-extra-ns)
			[ -z "$2" ] && usage
	                NEW_NAMESERVER=$2
        	        shift 2
			;;
		-extra-domain)
			[ -z "$2" ] && usage 
			NEW_EXTRADOMAIN=$2
			shift 2
			;;
		*)
			usage
			;;
	esac

done

	
# If the ETHERNET is the Internal Device: 

if [ "$INTERNAL" = "True" ] ; then

	# Is a Valid IP/NETMASK?
	check_ipcalc_arg "$NEW_IP" "$NEW_NETMASK" || die "Please give me a IP NETMASK"
	
	# Yes, now We must assign it
	set_interfaces $ETH $NEW_IP $NEW_NETMASK
fi

if [ "$EXTERNAL" = "True" ] ; then


	if [ "$DHCP" = "True" ] ; then

        	set_interfaces $ETH dhcp
	
		# Is a Valid IP/NETMASK?
	else
		if check_ipcalc_arg "$NEW_IP" "$NEW_NETMASK" ; then
			[ -z "$NEW_GATEWAY" ] || is_valid_gw || die "Gateway not valid, please check it"
		 	# Yes, now We must assign it
	        	set_interfaces $ETH $NEW_IP $NEW_NETMASK $NEW_GATEWAY
		
		else 
			die "Please give me a IP/NETMASK or Check DHCP Option"
		
	     	fi 

	fi

fi 


if [ ! -z "$NEW_EXTRADOMAIN" ] ; then

	llxcfg-setvars DNS_EXTRA_DOMAINS="$NEW_EXTRADOMAIN"

fi

if [ ! -z "$NEW_NAMESERVER" ] ; then

	llxcfg-setvars DNS_EXTRA_NS="$NEW_NAMESERVER"

fi