#!/bin/sh
# Controls configuration knobs for ptp devices.

. /etc/utils.sh

CONFIG_DIR="/config/settings"

usage() {
  echo "Usage:"
  echo
  echo "  -h                            This help screen"
  echo "  -g config_option              Get config_option"
  echo "  -i config_option              Do any initialization for config_option"
  echo "  -s config_option value        Set config_option to value"
  echo "  -d config_option value        Set default (set if not set)"
  echo "  -c config_option              Clear config_option"
  echo
  echo "Some example invocations:"
  echo
  echo "  Set the craft port ip address to 192.168.1.1 on subnet 255.255.255.0:"
  echo "    $0 -s craft_ipaddr 192.168.1.1/24"
  echo
  echo "  Get the craft port ip address:"
  echo "    $0 -g craft_ipaddr"
  echo "    192.168.1.1/24"
  echo
  echo "  Initialize the craft port with the provided ip address:"
  echo "    $0 -i craft_ipaddr"
  echo
  echo "  Clear the craft_ipaddr config setting:"
  echo "    $0 -c craft_ipaddr"
  echo
  exit 99
}

die() {
  echo "Fatal: $@" >&2
  exit 1
}

do_get() {
  local config_file="$CONFIG_DIR/$1"
  [ -e "$config_file" ] || exit 2
  read opt <"$config_file"
  [ -n "$opt" ] || exit 2
  echo "$opt"
}

do_vlan() {
  local file="$CONFIG_DIR/$1" if="$2" vname="$3"
  local vif="$if.$vname" vlan
  [ -r "$file" ] || die "Failed to initialize $1: Cannot open $file"
  read vlan <"$file"
  [ -n "$vlan" ] || die "Cannot init $1: Need to set a value first."

  # clear existing
  if [ -e "/sys/class/net/$vif" ]; then
    retval=$(ip link delete "$vif" 2>&1)
    [ "$?" -eq "0" ] || die "Failed to delete $vif: $retval."
  fi

  # add vlan interface, bring up
  retval=$(ip link add link $if name $vif type vlan id $vlan 2>&1)
  [ "$?" -eq "0" ] || die "Failed to add $vif: $retval."
  retval=$(ifup $vif 2>&1)
  [ "$?" -eq "0" ] || die "Failed to ifup $vif: $retval."

  # restart cpss if running to pick up new vlans
  pgrep -x cpss && restart cpss
}

do_ipaddr() {
  local file="$CONFIG_DIR/$1" if="$2"
  local ipaddr
  [ -r "$file" ] || die "Failed to initialize $1: Cannot open $file"
  read ipaddr <"$file"
  [ -n "$ipaddr" ] || die "Cannot init $1: Need to set a value first."

  # Clear any existing values on this interface so we don't get an error.
  retval=$(ip addr flush dev $if 2>&1)
  [ "$?" -eq "0" ] || die "Failed to flush $if: $retval."

  # Set the new ip address from the config file.
  retval=$(ip addr add $ipaddr dev $if 2>&1)
  [ "$?" -eq "0" ] || die "Failed to set $ipaddr on $if: $retval"
}

do_init() {
  case "$1" in
    craft_ipaddr)
      do_ipaddr "$1" craft0
      ;;
    local_ipaddr)
      do_ipaddr "$1" sw0.peer
      ;;
    vlan_inband)
      do_vlan "$1" sw0 inband
      ;;
    vlan_ooband)
      do_vlan "$1" sw0 ooband
      ;;
    vlan_peer)
      do_vlan "$1" sw0 peer
      ;;
    *)
      echo "Nothing to initialize for $1" && exit 2
      ;;
  esac
}

do_set() {
  local file="$CONFIG_DIR/$1"
  local value="$2"
  if [ -z "$file" ] || [ -z "$value" ]; then
    die "Missing 'value' for set command."
  fi
  atomic $file $value || die "Failed to write config value to $file: $retval"
}

do_set_if_not_set() {
  local file="$CONFIG_DIR/$1"
  if [ ! -f "$file" ]; then
    do_set "$1" "$2"
  fi
}

do_clear() {
  rm -f "$CONFIG_DIR/$1"
}

if [ "$#" -eq "0" ]; then
  usage
fi

# If the config settings directory structure does not exist, we need to try to
# create it.
if [ ! -d "$CONFIG_DIR" ]; then
  mkdir -p "$CONFIG_DIR"
fi

while getopts ":cg:hi:s:d:" option
do
  case "$option" in
    g)
      option_found=1 && do_get "$2"
      ;;
    i)
      option_found=1 && do_init "$2"
      ;;
    s)
      option_found=1 && do_set "$2" "$3"
      ;;
    d)
      option_found=1 && do_set_if_not_set "$2" "$3"
      ;;
    c)
      option_found=1 && do_clear "$2"
      ;;
    h)
      usage
      ;;
    \?|:|*)
      echo "$0: Missing option for -$OPTARG" && echo && usage
      ;;
  esac
done

if [ -z "$option_found" ]; then
  echo "$0: Unknown options: $@"
  usage
fi