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#!/bin/sh
# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public Licens
has() {
local desired=$1 x
shift
for x in "$@"; do
[ "$desired" = "$x" ] && return 0;
done
return 1
}
find_available_node() {
local val=$(ifconfig -a | grep -i ^qtap | cut -d ' ' -f1)
# Strip off ifconfig appended ':'
val="${val%:}"
local pos=0
while has qtap${pos} $val; do
pos=$(( $pos + 1 ))
done
echo qtap${pos}
}
create_node() {
local qtap="$1"
shift
tunctl -b -t "${qtap}" "$@" > /dev/null || die "tunctl failed"
brctl addif br0 "${qtap}" || die "brctl failed"
ifconfig "${qtap}" up 0.0.0.0 promisc || die "ifconfig failed"
}
destroy_node() {
issue=
ifconfig ${1} down || { echo "ifconfig failed";issue=1; }
brctl delif br0 ${1} || { echo "brctl failed";issue=2; }
tunctl -d ${1} > /dev/null || { echo "tunctl failed";issue=3;}
[ -n "${issue}" ] && exit $(( $issue ))
}
die() {
echo "$@" >&2
exit 1
}
usage() {
echo "commands available:"
echo "create-specific qtap-name [ -u user ] [ -g group ]"
echo "create [ -u user ] [ -g group ]"
echo "destroy qtap-name"
echo
}
usage_die() {
usage
die "$@"
}
create_user=
create_group=
parse_create_options() {
while [ $# -ne 0 ]; do
local x="$1"
case "$x" in
-u=*)
shift
set -- "-u" "${x#-u=}" "$@"
;&
-u)
shift
[ -z "$1" ] && die "-u requires an argument"
create_user="$1"
shift
;;
-g=*)
shift
set -- "-g" "${x#-u=}" "$@"
;&
-g)
shift
[ -z "$1" ] && die "-g requires an argument"
create_group="$2"
shift
;;
*)
die "unknown option $1"
esac
done
}
output_qtap=false
case "$1" in
destroy)
shift
[ $# -eq 0 ] && usage_die "destroy requires a second argument"
[ $# -gt 1 ] && usage_die "no idea what to do with args: $@"
destroy_node "$1"
;;
create)
output_qtap=true
qtap=$(find_available_node)
[ -z "$qtap" ] && die "failed to find a qtap node to use"
shift
set -- create_specific "${qtap}" "$@"
;&
create_specific)
shift
qtap="$1"; shift
parse_create_options "$@"
create_node "$qtap"
$output_qtap && echo "$qtap"
;;
*)
usage_die "Unknown command $1"
;;
esac
exit 0
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