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#!/bin/sh
#
# Shorewall interface helper utility - V4.2
#
# (c) 2007,2014 - Tom Eastep (teastep@shorewall.net)
#
# This file is installed in /usr/share/shorewall/wait4ifup
#
# Shorewall documentation is available at http://www.shorewall.net
#
# This program is part of Shorewall.
#
# 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, see <http://www.gnu.org/licenses/>.
#
# If an error occurs while starting or restarting the firewall, the
# firewall is automatically stopped.
#
# The firewall uses configuration files in /etc/shorewall/ - skeleton
# files is included with the firewall.
#
# wait4ifup <interface> [ <seconds to wait> ]
#
interface_is_up() {
[ -n "$(/sbin/ip link list dev $1 2> /dev/null | /bin/grep -e '[<,]UP[,>]')" ]
}
case $# in
1)
timeout=60
;;
2)
timeout=$2
;;
*)
echo "usage: $(basename $0) <interface> [ <timeout> ]"
exit 2
;;
esac
while [ $timeout -gt 0 ]; do
interface_is_up $1 && exit 0
/bin/sleep 1
timeout=$(( $timeout - 1 ))
done
exit 1
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