#!/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="${VTPM_NAME:-vtpm-test-save-load-state}"
SWTPM_DEV_NAME="/dev/${VTPM_NAME}"
TPM_PATH="$(mktemp -d)" || exit 1
STATE_FILE=$TPM_PATH/tpm-00.permall
VOLATILE_STATE_FILE=$TPM_PATH/tpm-00.volatilestate
MY_VOLATILE_STATE_FILE=$TPM_PATH/my.volatilestate
MY_PERMANENT_STATE_FILE=$TPM_PATH/my.permanent
MY_SAVESTATE_STATE_FILE=$TPM_PATH/my.savestate
SWTPM_CMD_UNIX_PATH=${TPM_PATH}/unix-cmd.sock
SWTPM_CTRL_UNIX_PATH=${TPM_PATH}/unix-ctrl.sock
SWTPM_INTERFACE=${SWTPM_INTERFACE:-cuse}
LINEAR_STATE_FILE=$TPM_PATH/linear-state
BACKEND_PARAM=""

if [ "${SWTPM_TEST_LINEAR_FILE:-0}" -ne 0 ]; then
	BACKEND_PARAM="--tpmstate backend-uri=file://$LINEAR_STATE_FILE"
fi

logfile="$(mktemp)" || exit 1

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

trap "cleanup" EXIT

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

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

TPM_PATH=$TPM_PATH run_swtpm "${SWTPM_INTERFACE}" \
	${BACKEND_PARAM:+${BACKEND_PARAM}} \
	--log "file=$logfile"

display_processes_by_name "swtpm"

if ! kill_quiet -0 "${SWTPM_PID}"; then
	echo "Error: ${SWTPM_INTERFACE} TPM did not start."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Init the TPM
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -i; then
	echo "Error: Could not initialize the ${SWTPM_INTERFACE} TPM."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

if ! kill_quiet -0 "${SWTPM_PID}" 2>/dev/null; then
	echo "Error: ${SWTPM_INTERFACE} TPM not running anymore after INIT."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Startup the TPM
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x00\xC1\x00\x00\x00\x0C\x00\x00\x00\x99\x00\x01')
exp=' 00 c4 00 00 00 0a 00 00 00 00'
if [ "$RES" != "$exp" ]; then
	echo "Error: Did not get expected result from TPM_Startup(ST_Clear)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -h 1234; then
	echo "Error: Hash command did not work."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Read PCR 17
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x00\xC1\x00\x00\x00\x0E\x00\x00\x00\x15\x00\x00\x00\x11')
exp=' 00 c4 00 00 00 1e 00 00 00 00 97 e9 76 e4 f2 2c d6 d2 4a fd 21 20 85 ad 7a 86 64 7f 2a e5'
if [ "$RES" != "$exp" ]; then
	echo "Error: (1) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Assert physical presence
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x00\xC1\x00\x00\x00\x0C\x40\x00\x00\x0A\x00\x20')
exp=' 00 c4 00 00 00 0a 00 00 00 00'
if [ "$RES" != "$exp" ]; then
	echo "Error: (1) Did not get expected result from TSC_PhysicalPresence(ENABLE)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Create a big NVRAM Area with 4000 bytes (0xfa0)
tmp='\x00\xC1\x00\x00\x00\x65\x00\x00\x00\xcc\x00\x18\x00\x00\x00\x01'
tmp+='\x00\x03\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
tmp+='\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x01'
tmp+='\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
tmp+='\x00\x00\x00\x00\x00\x17\x00\x01\x00\x01\x00\x00\x00\x00\x00\x0f'
tmp+='\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
tmp+='\x00\x00\x00\x00\x00'
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" $tmp)
exp=' 00 c4 00 00 00 0a 00 00 00 00'
if [ "$RES" != "$exp" ]; then
	echo "Error: (1) Did not get expected result from TPM_NVDefineSpace()"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Send SaveState command
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x00\xC1\x00\x00\x00\x0a\x00\x00\x00\x98')
exp=' 00 c4 00 00 00 0a 00 00 00 00'
if [ "$RES" != "$exp" ]; then
	echo "Error: (1) Did not get expected result from TPM_SaveState()"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --save permanent "$MY_PERMANENT_STATE_FILE"; then
	echo "Error: Could not write permanent state file $MY_PERMANENT_STATE_FILE."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
if [ ! -r "$MY_PERMANENT_STATE_FILE" ]; then
	echo "Error: Permanent state file $MY_PERMANENT_STATE_FILE does not exist."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Saved permanent state."

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --save volatile "$MY_VOLATILE_STATE_FILE"; then
	echo "Error: Could not write volatile state file $MY_VOLATILE_STATE_FILE."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
if [ ! -r "$MY_VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $MY_VOLATILE_STATE_FILE does not exist."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Saved volatile state."

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --save savestate "$MY_SAVESTATE_STATE_FILE"; then
	echo "Error: Could not write savestate state file $MY_SAVESTATE_STATE_FILE."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
if [ ! -r "$MY_SAVESTATE_STATE_FILE" ]; then
	echo "Error: Savestate state file $MY_SAVESTATE_STATE_FILE does not exist."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Saved savestate state."

#ls -l $(dirname $MY_VOLATILE_STATE_FILE)/*
#sha1sum $(dirname $MY_VOLATILE_STATE_FILE)/*

# we will use our own volatile state
rm -f "$VOLATILE_STATE_FILE" "$STATE_FILE"

# Stop the TPM; this will not shut it down
exec 100>&-
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --stop; then
	echo "Error: Could not stop the ${SWTPM_INTERFACE} TPM."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

if ! kill_quiet -0 "${SWTPM_PID}"; then
	echo "Error (2): ${SWTPM_INTERFACE} TPM is not running anymore."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# load state into the TPM
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --load permanent "$MY_PERMANENT_STATE_FILE"; then
	echo "Could not load permanent state into vTPM"
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Loaded permanent state."

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --load volatile "$MY_VOLATILE_STATE_FILE"; then
	echo "Could not load volatile state into vTPM"
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Loaded volatile state."

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --load savestate "$MY_SAVESTATE_STATE_FILE"; then
	echo "Could not load savestate state into vTPM"
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Loaded savestate state."

#ls -l $(dirname $MY_VOLATILE_STATE_FILE)/*
#sha1sum $(dirname $MY_VOLATILE_STATE_FILE)/*

# Init the TPM
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -i; then
	echo "TPM Init failed."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Volatile state must have been removed by TPM now
if [ -r "$VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $VOLATILE_STATE_FILE still exists."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Read the PCR again ...
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x00\xC1\x00\x00\x00\x0E\x00\x00\x00\x15\x00\x00\x00\x11')
exp=' 00 c4 00 00 00 1e 00 00 00 00 97 e9 76 e4 f2 2c d6 d2 4a fd 21 20 85 ad 7a 86 64 7f 2a e5'
if [ "$RES" != "$exp" ]; then
	echo "Error: (2) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Save the volatile state again
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -v; then
	echo "Error: Could not have the ${SWTPM_INTERFACE} TPM store the volatile state to a file."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

if [ "${SWTPM_TEST_LINEAR_FILE:-0}" -eq 0 ] && [ ! -r "$VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $VOLATILE_STATE_FILE does not exist."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Send a new TPM_Init
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -i; then
	echo "Error: Could not initialize the ${SWTPM_INTERFACE} TPM."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Volatile state must have been removed by TPM now
if [ -r "$VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $VOLATILE_STATE_FILE still exists."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Read the PCR again ...
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x00\xC1\x00\x00\x00\x0E\x00\x00\x00\x15\x00\x00\x00\x11')
exp=' 00 c4 00 00 00 1e 00 00 00 00 97 e9 76 e4 f2 2c d6 d2 4a fd 21 20 85 ad 7a 86 64 7f 2a e5'
if [ "$RES" != "$exp" ]; then
	echo "Error: (2) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Final shut down
exec 100>&-
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -s; then
	echo "Error: Could not shut down the ${SWTPM_INTERFACE} TPM."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

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

if [ "${SWTPM_TEST_LINEAR_FILE:-0}" -ne 0 ]; then
	if [ ! -e "$LINEAR_STATE_FILE" ]; then
		echo "Error: TPM state file $LINEAR_STATE_FILE does not exist."
		echo "TPM Logfile:"
		cat "$logfile"
		exit 1
	fi
else
	if [ ! -e "$STATE_FILE" ]; then
		echo "Error: TPM state file $STATE_FILE does not exist."
		echo "TPM Logfile:"
		cat "$logfile"
		exit 1
	fi
fi

echo "OK"

exit 0