Initial commit

meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp.sh

@@ -0,0 +1,80 @@
+#!/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.
+
+# A list of functions which get executed for each bound DHCP lease.
+# These are configured by the files included below.
+# Shellcheck does not understand how this gets referenced
+# shellcheck disable=SC2034
+GBMC_BR_DHCP_HOOKS=()
+
+# A dict of outstanding items that should prevent DHCP completion
+declare -A GBMC_BR_DHCP_OUTSTANDING=()
+
+# SC can't find this path during repotest
+# shellcheck disable=SC1091
+source /usr/share/network/lib.sh || exit
+# SC can't find this path during repotest
+# shellcheck disable=SC1091
+source /usr/share/gbmc-br-lib.sh || exit
+
+# Load configurations from a known location in the filesystem to populate
+# hooks that are executed after each event.
+gbmc_br_source_dir /usr/share/gbmc-br-dhcp || exit
+
+# Write out the current PID and cleanup when complete
+trap 'rm -f /run/gbmc-br-dhcp.pid' EXIT
+echo "$$" >/run/gbmc-br-dhcp.pid
+
+if [ "$1" = bound ]; then
+  # Variable is from the environment via udhcpc6
+  # shellcheck disable=SC2154
+  echo "DHCPv6(gbmcbr): $ipv6/128" >&2
+
+  pfx_bytes=()
+  ip_to_bytes pfx_bytes "$ipv6"
+  # Ensure we are a BMC and have a suffix nibble, the 0th index is reserved
+  if (( pfx_bytes[8] != 0xfd || pfx_bytes[9] & 0xf == 0 )); then
+    echo "Invalid address" >&2
+    exit 1
+  fi
+  # Ensure we don't have more than a /80 address
+  for (( i = 10; i < 16; ++i )); do
+    if (( pfx_bytes[i] != 0 )); then
+      echo "Invalid address" >&2
+      exit 1
+    fi
+  done
+
+  pfx="$(ip_bytes_to_str pfx_bytes)"
+  gbmc_br_set_ip "$pfx" || exit
+
+  if [ -n "${fqdn-}" ]; then
+    echo "Using hostname $fqdn" >&2
+    hostnamectl set-hostname "$fqdn" || true
+  fi
+
+  gbmc_br_run_hooks GBMC_BR_DHCP_HOOKS || exit
+
+  # If any of our hooks had expectations we should fail here
+  if [ "${#GBMC_BR_DHCP_OUTSTANDING[@]}" -gt 0 ]; then
+    echo "Not done with DHCP process: ${!GBMC_BR_DHCP_OUTSTANDING[*]}" >&2
+    exit 1
+  fi
+
+  # Ensure that the installer knows we have completed processing DHCP by
+  # running a service that reports completion
+  echo 'Start DHCP Done' >&2
+  systemctl start dhcp-done@DONE --no-block
+fi