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#!/bin/bash
set -e
die() {
printf '%s\n' "$*"
exit 1
}
cleanup() {
local IDX="$1"
pkill -F "/tmp/nm-dnsmasq-d_$IDX.pid" dnsmasq &>/dev/null || :
: > "/tmp/nm-dnsmasq-d_$IDX.pid"
ip link del "d_$IDX" &>/dev/null || :
}
setup() {
local IDX="$1"
cleanup "$IDX"
ip link add "net$IDX" type veth peer "d_$IDX"
ip link set "d_$IDX" up
ip addr add "192.168.$((120 + $IDX)).1/23" dev "d_$IDX"
dnsmasq \
--conf-file=/dev/null \
--pid-file="/tmp/nm-dnsmasq-d_$IDX.pid" \
--no-hosts \
--keep-in-foreground \
--bind-interfaces \
--except-interface=lo \
--clear-on-reload \
--listen-address="192.168.$((120 + $IDX)).1" \
--dhcp-range="192.168.$((120 + $IDX)).100,192.168.$((120 + $IDX)).150" \
--no-ping \
&
}
IDX=1
CMD=
for (( i=1 ; i<="$#" ; )) ; do
c="${@:$i:1}"
i=$((i+1))
case "$c" in
setup|cleanup)
CMD="$c"
;;
--idx|-i)
test $i -le "$#" || die "missing argument to --idx"
IDX="${@:$i:1}"
i=$((i+1))
;;
*)
die "invalid argument"
;;
esac
done
test "$CMD" != "" || die "missing command (setup|cleanup)"
$CMD "$IDX"
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