#!/bin/sh

NC='netcat'
NCOPTS='-u -n -b -w 1'
NCPORT='9'
RC='/etc/wolshrc'
METHOD="hex"
HOST=''
HMAC=''
OMAC=''
BCAST=''

display_help() {
  cat << EOF
SYNOPIS

  small wake-on-lan-sript

USAGE

  wolsh [-h] [-c conf] host1 [host2 host3 host4 ...]

OPTIONS

  -h             help
  -c  conf       configfile

  -H             use hex-mac (default)
  -O             use octal-mac

  -hm mac        macaddress (hex)
  -oc mac        macaddress (oct)
  -b  broadcast  broadcast

  -n  ncbinary   path to netcat binary
  -o  opts       netcat options
  -p  port       port

EOF
}

wake_on_lan()
{
  [ -f "$RC" ]   && l=$(grep "$1 " $RC)
  [ -n "$l" ]    && set $l
  [ -z "$HOST" ] && HOST="$1"
  [ -z "$BCAST" ]&& BCAST="$2"
  [ -z "$HMAC" ] && HMAC="$3"
  [ -z "$OMAC" ] && OMAC="$4"

  if [ -n "$HMAC" -o -n "$OMAC" -a -n "$BCAST" ]; then
    echo "try to wakup $HOST at $BCAST with $HMAC|$OMAC"
    case "$METHOD" in
      hex | h )
        echo -en $(
          (
            echo -en ":ff:ff:ff:ff:ff:ff"
            echo -en ":$HMAC:$HMAC:$HMAC:$HMAC:$HMAC:$HMAC:$HMAC:$HMAC"
            echo -en ":$HMAC:$HMAC:$HMAC:$HMAC:$HMAC:$HMAC:$HMAC:$HMAC"
          ) | sed 's/:/\x/g'
        );;
      oct | o )
        echo -en $(
          (
            echo -en ":377:377:377:377:377:377"
            echo -en ":$OMAC:$OMAC:$OMAC:$OMAC:$OMAC:$OMAC:$OMAC:$OMAC"
            echo -en ":$OMAC:$OMAC:$OMAC:$OMAC:$OMAC:$OMAC:$OMAC:$OMAC"
          ) | sed 's/:/\\/g'
        );;
     esac | $NC $NCOPTS $BCAST $NCPORT
  else
    echo "missing config for $1"
  fi

  HOST=''
  HMAC=''
  OMAC=''
  BCAST=''
}

[ -f "$HOME/.wolshrc" ] && RC="$HOME/.wolshrc"

[ -z "$1" ] && { display_help; exit 0; }
while [ $# -gt 0 ]
do
  case $# in
    1)
      case "$1" in
        -h) display_help; exit 0;;
        -c) echo "missing rcfile"; exit 1;;
        -hm) echo "missing hexmac"; exit 1;;
        -om) echo "missing octmac"; exit 1;;
        -b) echo "missing broadcastmask"; exit 1;;
        -n) echo "missing netcat binary"; exit 1;;
        -o) echo "missing opts"; exit 1;;
        -p) echo "missing port"; exit 1;;
        * ) wake_on_lan "$1"; shift 1 ;;
      esac;;

    *)
      case "$1" in
        -c) if [ -f "$2" ]; then RC="$2"; else echo "couldnt read config"; exit 1; fi;shift 1;;
        -O) METHOD="oct";;
        -H) METHOD="hex";;
        -hm) HMAC="$2";shift 1;;
        -om) OMAC="$2";shift 1;;
        -b) BCAST="$2";shift 1;;
        -n) [ -f "$2" -a -x "$2" ] && NC="$2"; shift 1;;
        -o) NCOPTS="$2"; shift 1;;
        -p) NCPORT="$2"; shift 1;;
        * ) wake_on_lan "$1";;
      esac
      shift 1
      ;;
  esac
done