#!/bin/bash
# -------
# File:        cap-net
# Description: LliureX-cap dns and network configuration
#              Configures a network alias for each cap node
#              NB: This program works ONLY for the capname defined
#              in the CAP_NET_CAPNAME llxcfg variable, so the
#              server network configuration program must "synchronize"
#              this variable with the school's main capname ("CODIGO_CENTRO'?)
#              In addition, CAP_NET_HOST_IFACE must be defined locally in each host
#              
# Authors:     Luis Antonio 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
# --------


# do some tests
[ "$CAP_VAR_CFG_DIR" ] || exit 0
[ "$CAP_FQDN" ] || exit 0
[ "$CAPNAME" ] || exit 0
[ "$CAP_HOST_ID" ] || exit 0
GLOBAL_CFG_FILE="$CAP_VAR_CFG_DIR/vars.net"
GLOBAL_VARS_FILE="$CAP_VAR_CFG_DIR/dns.vars"
# HOST_CFG_FILE="$CAP_VAR_CFG_DIR/$CAP_FQDN.ip.net"
# read variables from global_file
[ ! -r "$GLOBAL_CFG_FILE" ] || 	read CAP_NET_ADDRESS CAP_NET_MASK CAP_NET_DOMAIN CAP_NET_ALIAS < "$GLOBAL_CFG_FILE"

eval "$(llxcfg-showvars CAP_NET_CAPNAME CAP_ZERO_CAPNAME)"
[ "$CAP_NET_CAPNAME" ] || CAP_NET_CAPNAME="$CAP_ZERO_CAPNAME"
[ "$CAP_NET_CAPNAME" -a "$CAP_NET_CAPNAME" = "$CAPNAME" ] || exit 0


# funcs
net_write_vars(){
	llxcfg-systemvars add CAP_NET_HOST_IP="$CAP_NET_HOST_IP" CAP_NET_HOST_MASK="$CAP_NET_MASK" CAP_NET_HOST_ALIAS="$CAP_NET_ALIAS" CAP_NET_ADDRESS="$CAP_NET_ADDRESS" CAP_NET_CAPNAME="$CAP_NET_CAPNAME" CAP_NET_MASK="$CAP_NET_MASK" CAP_NET_DOMAIN="$CAP_NET_DOMAIN"
}

# net_write_conf(){
#	echo "$CAP_NET_HOST_IP node-$CAP_HOST_ID.$CAPNAME.$CAP_NET_DOMAIN" | llxcfg-install "-" "$HOST_CFG_FILE"
# }

net_write_global(){
	echo "$CAP_NET_ADDRESS $CAP_NET_MASK $CAP_NET_DOMAIN $CAP_NET_ALIAS" | llxcfg-install "-" "$GLOBAL_CFG_FILE"
	echo CAP_NET_ADDRESS=$CAP_NET_ADDRESS > "$GLOBAL_VARS_FILE"
	echo CAP_NET_CAPNAME=$CAP_NET_CAPNAME >> "$GLOBAL_VARS_FILE"
	echo CAP_NET_MASK=$CAP_NET_MASK >> "$GLOBAL_VARS_FILE"
	echo CAP_NET_DOMAIN=$CAP_NET_DOMAIN >> "$GLOBAL_VARS_FILE"
}

net_test_vars(){
	[ "$CAP_NET_ADDRESS" ] || return 1
	[ "$CAP_NET_MASK" ] || return 1
	[ "$CAP_NET_ALIAS" ] || return 1
	[ "$CAP_NET_DOMAIN" ] || return 1
	return 0
}

net_generate_ip(){
	# TODO: may be this trivial algorithm is not sufficient ...
	echo "${CAP_NET_ADDRESS%.*}.$CAP_HOST_ID"

}

case "$1" in
	create|join|reconfigure|request)
		if [ "$1" = "create" ] ; then
			# read "once" CAP_NET variables
			eval "$(llxcfg-showvars CAP_NET_ALIAS CAP_NET_ADDRESS CAP_NET_MASK CAP_NET_DOMAIN)"
			net_test_vars  || exit 0
			# and write global
			net_write_global
		else
			net_test_vars || exit 0
		fi
		# generate address
		CAP_NET_HOST_IP="$(net_generate_ip)"
		# write local
		net_write_vars
		# set the alias
		llxcfg-cap add-alias
		# net_write_conf
		llxcfg-dnsd update
		;;
	post-disconnect)
		llxcfg-systemvars del "CAP_NET_HOST_IP" "CAP_NET_HOST_MASK"
		llxcfg-cap remove-alias eth1
	;;
esac
exit 0