#!/bin/bash
# Copyright 2021 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.

HAS_DHCRELAY='@GBMC_NCSI_DHCP_RELAY@'

if [ "$HAS_DHCRELAY" = 1 ]; then
  override=/run/systemd/system/gbmc-ncsi-dhcrelay.service.d/10-nosp.conf
  mkdir -p "$(dirname "$override")"
  echo '[Service]' >"$override"
  echo 'ExecStart=' >>"$override"
  # Remove the source relay port from the relay, bringing it back to run on
  # the default port 547. Our relays don't support the source port option needed
  # to run on 3967 for our legacy NICs.
  grep '^ExecStart=' /lib/systemd/system/gbmc-ncsi-dhcrelay.service | \
    sed 's, -rp 3967,,' >>"$override"
fi

override=/run/systemd/system/gbmc-br-dhcp.service.d/10-direct.conf
mkdir -p "$(dirname "$override")"
echo '[Service]' >"$override"
echo 'ExecStart=' >>"$override"
# Switch the gbmcbr interface for the NCSI one to avoid passing the SOLICIT
# message through the BMC relay.
grep '^ExecStart=' /lib/systemd/system/gbmc-br-dhcp.service | \
  sed 's, -i gbmcbr, -i @NCSI_IF@,' >>"$override"

systemctl daemon-reload
if [ "$HAS_DHCRELAY" = 1 ]; then
  systemctl reset-failed gbmc-ncsi-dhcrelay
  systemctl restart --no-block gbmc-ncsi-dhcrelay
fi
systemctl reset-failed gbmc-br-dhcp
systemctl restart --no-block gbmc-br-dhcp

read -r -d '' contents <<EOF
table inet filter {
  chain ncsi_legacy_input {
      udp dport {546,547} accept
  }
}
EOF
rfile=/run/nftables/60-gbmc-ncsi-ra.rules
mkdir -p "$(dirname "$rfile")"
printf '%s' "$contents" >"$rfile"
systemctl reset-failed nftables
systemctl --no-block reload-or-restart nftables