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#!/bin/bash
show_help() {
echo "usage: network-state get-default-iface"
echo " network-state wait-listen-port <PORT>"
echo " network-state make-network-service <SERVICE_NAME> <PORT>"
}
get_default_iface(){
ip route get 8.8.8.8 | awk '{ print $5; exit }'
}
wait_listen_port(){
local port="$1"
for _ in $(seq 120); do
if ss -lnt | grep -Pq "LISTEN.*?:$port +.*?\\n*"; then
break
fi
sleep 0.5
done
# Ensure we really have the listen port, this will fail with an
# exit code if the port is not available.
ss -lnt | grep -Pq "LISTEN.*?:$port +.*?\\n*"
}
make_network_service() {
local service_name="$1"
local port="$2"
systemd-run --unit "$service_name" sh -c "while true; do printf 'HTTP/1.1 200 OK\\n\\nok\\n' | nc -l -p $port -w 1; done"
wait_listen_port "$port"
}
main() {
if [ $# -eq 0 ]; then
show_help
exit 0
fi
local subcommand=$1
local action=
while [ $# -gt 0 ]; do
case "$1" in
-h|--help)
show_help
exit 0
;;
*)
action=$(echo "$subcommand" | tr '-' '_')
shift
break
;;
esac
done
if [ -z "$(declare -f "$action")" ]; then
echo "network-state: no such command $subcommand" >&2
show_help
exit 1
fi
"$action" "$@"
}
main "$@"
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