#!/bin/sh # # Shorewall interface helper utility - V4.2 # # This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt] # # (c) 2007 - 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 free software; you can redistribute it and/or modify # it under the terms of Version 2 of the GNU General Public License # as published by the Free Software Foundation. # # 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 Street, Fifth Floor, Boston, MA 02110-1301 USA. # # 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