#!/bin/bash

# For the license, see the LICENSE file in the root directory.
#set -x

ROOT=${abs_top_builddir:-$(pwd)/..}
TESTDIR=${abs_top_testdir:-$(dirname "$0")}

VTPM_NAME="vtpm-test-tpm2-setbuffersize"
SWTPM_DEV_NAME="/dev/${VTPM_NAME}"
TPM_PATH="$(mktemp -d)" || exit 1
STATE_FILE=$TPM_PATH/tpm2-00.permall
OUTFILE=$TPM_PATH/output
VOLATILE_STATE_FILE=$TPM_PATH/tpm2-00.volatilestate
SWTPM_CMD_UNIX_PATH=${TPM_PATH}/unix-cmd.sock
SWTPM_CTRL_UNIX_PATH=${TPM_PATH}/unix-ctrl.sock
SWTPM_INTERFACE=${SWTPM_INTERFACE:-cuse}

function cleanup()
{
	pid=${SWTPM_PID}
	if [ -n "$pid" ]; then
		kill_quiet -9 "$pid"
	fi
	rm -rf "$TPM_PATH"
}

trap "cleanup" EXIT

[ "${SWTPM_INTERFACE}" == cuse ] && source "${TESTDIR}/test_cuse"
source "${TESTDIR}/common"

rm -f "$STATE_FILE" "$VOLATILE_STATE_FILE" 2>/dev/null

TPM_PATH=$TPM_PATH run_swtpm "${SWTPM_INTERFACE}" --tpm2

kill_quiet -0 "${SWTPM_PID}"
if [ $? -ne 0 ]; then
	echo "Error: ${SWTPM_INTERFACE} TPM did not start."
	exit 1
fi

# Check the buffer size
run_swtpm_ioctl "${SWTPM_INTERFACE}" -b 0 > "${OUTFILE}"
if [ $? -ne 0 ]; then
	echo "Error: Could not get the buffersize of the ${SWTPM_INTERFACE} TPM."
	exit 1
fi
cat "${OUTFILE}"

if ! grep "TPM buffersize" "${OUTFILE}" | grep -q 4096; then
	echo "Error: The TPM buffersize of the ${SWTPM_INTERFACE} TPM is not 4096."
	exit 1
fi

# set the buffer size -- it's not going to change but command must not fail
run_swtpm_ioctl "${SWTPM_INTERFACE}" -b 4000 > "${OUTFILE}"
if [ $? -ne 0 ]; then
	echo "Error: Could not set the buffersize of the ${SWTPM_INTERFACE} TPM."
	exit 1
fi
cat "${OUTFILE}"

if ! grep "TPM buffersize" "${OUTFILE}" | grep -q 4000; then
	echo "Error: Could not set the buffersize of the ${SWTPM_INTERFACE} TPM to 4000."
	exit 1
fi

# Init the TPM
run_swtpm_ioctl "${SWTPM_INTERFACE}" -i
if [ $? -ne 0 ]; then
	echo "Error: Could not initialize the ${SWTPM_INTERFACE} TPM."
	exit 1
fi

kill_quiet -0 "${SWTPM_PID}" 2>/dev/null
if [ $? -ne 0 ]; then
	echo "Error: ${SWTPM_INTERFACE} TPM not running anymore after INIT."
	exit 1
fi

# Set the buffer size -- should fail
ERR="$(run_swtpm_ioctl "${SWTPM_INTERFACE}" -b 4096 2>&1)"
if [ $? -eq 0 ]; then
	echo "Error: Could set the buffersize while the ${SWTPM_INTERFACE} TPM is running."
	exit 1
fi
exp="TPM result from PTM_SET_BUFFERSIZE: 0xa"
if [ "$ERR" != "$exp" ]; then
	echo "Error: Unexpected error message"
	echo "Received: $ERR"
	echo "Expected: $exp"
	exit 1
fi

# Startup the TPM2
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x0c\x00\x00\x01\x44\x00\x00')
exp=' 80 01 00 00 00 0a 00 00 00 00'
if [ "$RES" != "$exp" ]; then
	echo "Error: Did not get expected result from TPM2_Startup(SU_Clear)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Read the Buffer sizes; we want to see '4000' (0xfa0) in the buffer sizes now
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x16\x00\x00\x01\x7a\x00\x00\x00\x06\x00\x00\x01\x1e\x00\x00\x00\x02')
exp=' 80 01 00 00 00 23 00 00 00 00 01 00 00 00 06 00 00 00 02 00 00 01 1e 00 00 0f a0 00 00 01 1f 00 00 0f a0'
if [ "$RES" != "$exp" ]; then
	echo "Error: Did not get expected result from TPM2_GetCapability()"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

run_swtpm_ioctl "${SWTPM_INTERFACE}" -s
if [ $? -ne 0 ]; then
	echo "Error: Could not shut down the ${SWTPM_INTERFACE} TPM."
	exit 1
fi

if wait_process_gone "${SWTPM_PID}" 4; then
	echo "Error: ${SWTPM_INTERFACE} TPM should not be running anymore."
	exit 1
fi

if [ ! -e "$STATE_FILE" ]; then
	echo "Error: TPM state file $STATE_FILE does not exist."
	exit 1
fi

echo "OK"

exit 0