[tpm2] sending commands to simulator

[tpm2] sending commands to simulator

[Roberts, William C]

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Just thought this might be valuable to others. To be more thorough in a test, we needed a way to send platform commands to the simulator, ideally through bash so we don't need to carry any other C programs.
I threw this little bash function together and thought I would share it for others.

mssim_command() {

  local raw="no"
  local port="2322"
  local ip="127.0.0.1"
  
  while getopts "a:p:rh" opt; do
    case ${opt} in
      h)
        echo "Send a command to the simulator"
        echo "mssim_command [option] <command>"
        echo "Valid commands are: "
        echo "  on, off, reset, phys_on, phys_off, nv_on, nv_off and failure_mode"
        echo "Additionally any other string can be passed and is interpreted as is"
        echo ""
        echo "Valid Options are:"
        echo " -p: Setting port number, defaults to 2321"
        echo " -a: Setting the IP Address, defaults to 127.0.0.1"
        echo " -r: For raw mode, do not interpret the string as a 4 byte u32 via xxd -p -r first"
 		echo " -h: Show this help message"
      ;;
      p )
        port=$OPTARG
      ;;
      a )
        ip=$OPTARG
      ;;
      r )
        raw="yes"
      ;;
      \? )
        echo "Invalid option: $OPTARG" 1>&2
      ;;
      : )
        echo "Invalid option: $OPTARG requires an argument" 1>&2
      ;;
    esac
    shift
  done

  local arg1="$1"
  if [ -z "$arg1" ]; then
    echo "Expected command as argument"
    return 1
  fi
  
  local cmd;

  case "$arg1" in

    on)
      cmd="0000001"
      ;;

    off)
      cmd="0000002"
      ;;

    reset)
      cmd="00000011"
      ;;
    
    phys_on)
      cmd="00000003"
      ;;

    phys_off)
      cmd="00000004"
      ;;
    
    cancel_on)
      cmd="00000009"
      ;;

    cancel_off)
      cmd="0000000a"
      ;;

    nv_on)
      cmd="0000000b"
      ;;

    nv_off)
      cmd="0000000c"
      ;;
    
    failure_mode)
      cmd="0000001e"
      ;;

    *)
      cmd="$1"
      ;;
  esac

  if [ "$raw" == "yes" ]; then
    echo -n "$cmd" | nc -N "$ip" "$port"
  else
    echo -n "$cmd" | xxd -p -r | nc -N "$ip" "$port"
  fi
}