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#!/bin/bash
#
# network-wait-online
#
# Copyright (c) 2013 Benjamin Robin <benjarobin>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; either version 2, 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/>.
#
VERSION="1.0"
###################################
### OPTIONS ###
###################################
VERBOSE=0
QUIET=0
TIMEOUT_WAIT=30
ADDR_WAIT=""
METHOD_WAIT="ping"
###################################
### General functions ###
###################################
# -ab --long -> -a -b --long
# set $OPTS
explode_args() {
unset OPTS
local arg=$1
while [[ $arg ]]; do
[[ $arg = "--" ]] && OPTS+=("$@") && break;
if [[ ${arg:0:1} = "-" && ${arg:1:1} != "-" ]]; then
OPTS+=("-${arg:1:1}")
(( ${#arg} > 2 )) && arg="-${arg:2}" || { shift; arg=$1; }
else
OPTS+=("$arg"); shift; arg=$1
fi
done
}
usage() {
cat << EOF
usage: $0 [options] address
This is a utility to find out whether we are online.
It is done by pinging or checking that the address passed to this script can be accessed.
Waits until the specified address can be accessed, or that the specified timeout expires.
On exit, the returned status code should be checked.
OPTIONS:
-h, --help Show this message
-q, --quiet Do not show any message
-v, --verbose Display every error message
-m, --method Select the method to wait on the specified address: "ping", "ping6" or "route"
-t, --timeout Set the maximum time to wait in second
-V, --version Display the version
ADDRESS: An IP address in case of routing, for ping can be a domain...
EOF
}
version() {
echo "network-wait-online $VERSION"
}
###################################
### Argument parsing ###
###################################
# Explode arguments
explode_args "$@"
set -- "${OPTS[@]}"
unset OPTS
while [[ $1 ]]; do
case "$1" in
-h|--help) usage; exit 0;;
-q|--quiet) QUIET=1; VERBOSE=0;;
-v|--verbose) QUIET=0; VERBOSE=1;;
-m|--method) shift; METHOD_WAIT="$1";;
-t|--timeout) shift; TIMEOUT_WAIT="$1";;
-V|--version) version; exit 0;;
*) if [ -z "$ADDR_WAIT" ] ; then ADDR_WAIT="$1"; else usage; exit 10; fi ;;
esac
shift
done
# Check that the address is specified
if [ -z "$ADDR_WAIT" ] ; then
usage
exit 10
fi
###################################
### Wait functions ###
###################################
wait_addr_ping() {
local retCode=12
local timeEnd=$(( $(date +%s) + TIMEOUT_WAIT ))
local timeLeft=$TIMEOUT_WAIT
while [ $timeLeft -gt 0 ] ; do
$METHOD_WAIT -c1 -W1 $ADDR_WAIT
retCode=$?
if [ $retCode -eq 0 ] ; then
break
else
sleep 0.3
timeLeft=$(( timeEnd - $(date +%s) ))
fi
done
return $retCode
}
wait_addr_route() {
local retCode=13
local nbStepLeft=$(( TIMEOUT_WAIT * 3 ))
while [ $nbStepLeft -gt 0 ] ; do
ip route get $ADDR_WAIT
retCode=$?
if [ $retCode -eq 0 ] ; then
break
else
sleep 0.33
nbStepLeft=$(( nbStepLeft - 1 ))
fi
done
return $retCode
}
###################################
### Program ###
###################################
exitCode=11
if [ "$METHOD_WAIT" == "ping" ] || [ "$METHOD_WAIT" == "ping6" ] ; then
if [ $VERBOSE -eq 1 ] ; then
wait_addr_ping
else
wait_addr_ping &>/dev/null
fi
exitCode=$?
elif [ "$METHOD_WAIT" == "route" ] ; then
if [ $VERBOSE -eq 1 ] ; then
wait_addr_route
else
wait_addr_route &>/dev/null
fi
exitCode=$?
else
usage
exit 10
fi
# Display result if not quiet
if [ $QUIET -eq 0 ]; then
if [ $exitCode -ne 0 ] ; then
echo "Failed to $METHOD_WAIT $ADDR_WAIT" 1>&2
else
echo "Successfully $METHOD_WAIT $ADDR_WAIT"
fi
fi
exit $exitCode
|