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#!/bin/bash
# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# If we don't have a saved IP, we keep running indefinitely
if ! srcip="$(cat /var/google/gbmc-br-ip 2>/dev/null)"; then
echo 'Missing saved gbmc-br IP' >&2
exit 0
fi
# Wait until a well known service is network available
echo "Waiting for network reachability" >&2
while ! ping -I "$srcip" -c 1 -W 1 2001:4860:4860::8888 >/dev/null 2>&1; do
sleep 1
done
# We need to guarantee we wait at least 5 minutes from reachable in
# case networking just came up
wait_min=5
echo "Network is reachable, waiting $wait_min min" >&2
sleep $((60 * wait_min))
get_dhcp_unit_json() {
busctl -j call \
org.freedesktop.systemd1 \
/org/freedesktop/systemd1/unit/gbmc_2dbr_2ddhcp_2eservice \
org.freedesktop.DBus.Properties \
GetAll s org.freedesktop.systemd1.Unit
}
# Follow the process and make sure it idles for at least 5 minutes before
# shutting down. This allows for failures and retries to happen.
while true; do
json="$(get_dhcp_unit_json)" || exit
last_ms="$(echo "$json" | jq -r '.data[0].StateChangeTimestampMonotonic.data')"
if pid="$(cat /run/gbmc-br-dhcp.pid 2>/dev/null)"; then
# If the DHCP configuration process is running, wait for it to finish
echo "DHCP still running ($pid), waiting" >&2
while [[ -e /proc/$pid ]]; do
sleep 1
done
# Wait for systemd to detect the process state change
while true; do
json="$(get_dhcp_unit_json)" || exit
ms="$(echo "$json" | jq -r '.data[0].StateChangeTimestampMonotonic.data')"
(( ms != last_ms )) && break
sleep 1
done
fi
echo 'Checking DHCP Active State' >&2
json="$(get_dhcp_unit_json)" || exit
activestr="$(echo "$json" | jq -r '.data[0].ActiveState.data')"
# The process is already stopped, we are done
[[ "$activestr" == 'inactive' ]] && exit
# If the process is running, give it at least 5 minutes from when it started
cur_s="$(cut -d' ' -f1 /proc/uptime)"
# Remove floating point if applied since bash can't perform float arithmetic
cur_s="${cur_s%.*}"
if [[ "$activestr" == 'active' ]]; then
active_ms="$(echo "$json" | jq -r '.data[0].ActiveEnterTimestampMonotonic.data')"
else
active_ms=$((cur_s*1000*1000))
fi
w=$((active_ms/1000/1000 + (wait_min*60) - cur_s))
[ "$w" -lt 0 ] && break
echo "Waiting ${w}s for DHCP process" >&2
sleep $w
done
echo "Stopping DHCP processing" >&2
systemctl stop --no-block gbmc-br-dhcp
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