#!/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="${VTPM_NAME:-vtpm-tpm2-test-save-load-state}"
SWTPM_DEV_NAME="/dev/${VTPM_NAME}"
TPM_PATH="$(mktemp -d)" || exit 1
STATE_FILE=$TPM_PATH/tpm2-00.permall
VOLATILE_STATE_FILE=$TPM_PATH/tpm2-00.volatilestate
MY_VOLATILE_STATE_FILE=$TPM_PATH/my.volatilestate
MY_PERMANENT_STATE_FILE=$TPM_PATH/my.permanent
SWTPM_INTERFACE=${SWTPM_INTERFACE:-cuse}
SWTPM_CMD_UNIX_PATH=${TPM_PATH}/unix-cmd.sock
SWTPM_CTRL_UNIX_PATH=${TPM_PATH}/unix-ctrl.sock

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

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

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

TPM_PATH=$TPM_PATH run_swtpm "${SWTPM_INTERFACE}" \
	--log "file=$logfile,level=20" \
	--tpm2

display_processes_by_name "$SWTPM"

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

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

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

# Startup the TPM
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(ST_Clear)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

run_swtpm_ioctl "${SWTPM_INTERFACE}" -h 1234
if [ $? -ne 0 ]; then
	echo "Error: Hash command did not work."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

# Read PCR 17
#                                                  length         CC            count       hashalg         sz
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x14\x00\x00\x01\x7e\x00\x00\x00\x01\x00\x0b\x03\x00\x00\x02')
exp=' 80 01 00 00 00 3e 00 00 00 00 00 00 00 18 00 00 00 01 00 0b 03 00 00 02 00 00 00 01 00 20 fc a5 d6 49 bf b0 c9 22 fd 33 0f 79 b2 00 43 28 9d af d6 0d 01 a4 c4 37 3c f2 8a db 56 c9 b4 54'
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

run_swtpm_ioctl "${SWTPM_INTERFACE}" --save permanent "$MY_PERMANENT_STATE_FILE"
if [ $? -ne 0 ]; 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."

run_swtpm_ioctl "${SWTPM_INTERFACE}" --save volatile "$MY_VOLATILE_STATE_FILE"
if [ $? -ne 0 ]; 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."

#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
run_swtpm_ioctl "${SWTPM_INTERFACE}" --stop
if [ $? -ne 0 ]; then
	echo "Error: Could not stop the ${SWTPM_INTERFACE} TPM."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

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

# load state into the TPM
run_swtpm_ioctl "${SWTPM_INTERFACE}" --load permanent "$MY_PERMANENT_STATE_FILE"
if [ $? -ne 0 ]; then
	echo "Could not load permanent state into vTPM"
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Loaded permanent state."

run_swtpm_ioctl "${SWTPM_INTERFACE}" --load volatile "$MY_VOLATILE_STATE_FILE"
if [ $? -ne 0 ]; then
	echo "Could not load volatile state into vTPM"
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi
echo "Loaded volatile state."

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

# Init the TPM
run_swtpm_ioctl "${SWTPM_INTERFACE}" -i
if [ $? -ne 0 ]; then
	echo "TPM Init failed."
	echo "TPM Logfile:"
	cat "$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}" '\x80\x01\x00\x00\x00\x14\x00\x00\x01\x7e\x00\x00\x00\x01\x00\x0b\x03\x00\x00\x02')
exp=' 80 01 00 00 00 3e 00 00 00 00 00 00 00 18 00 00 00 01 00 0b 03 00 00 02 00 00 00 01 00 20 fc a5 d6 49 bf b0 c9 22 fd 33 0f 79 b2 00 43 28 9d af d6 0d 01 a4 c4 37 3c f2 8a db 56 c9 b4 54'
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
run_swtpm_ioctl "${SWTPM_INTERFACE}" -v
if [ $? -ne 0 ]; 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 [ ! -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
run_swtpm_ioctl "${SWTPM_INTERFACE}" -i
if [ $? -ne 0 ]; 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}" '\x80\x01\x00\x00\x00\x14\x00\x00\x01\x7e\x00\x00\x00\x01\x00\x0b\x03\x00\x00\x02')
exp=' 80 01 00 00 00 3e 00 00 00 00 00 00 00 18 00 00 00 01 00 0b 03 00 00 02 00 00 00 01 00 20 fc a5 d6 49 bf b0 c9 22 fd 33 0f 79 b2 00 43 28 9d af d6 0d 01 a4 c4 37 3c f2 8a db 56 c9 b4 54'
if [ "$RES" != "$exp" ]; then
	echo "Error: (3) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Final shut down
run_swtpm_ioctl "${SWTPM_INTERFACE}" -s
if [ $? -ne 0 ]; 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 [ ! -e "$STATE_FILE" ]; then
	echo "Error: TPM state file $STATE_FILE does not exist."
	echo "TPM Logfile:"
	cat "$logfile"
	exit 1
fi

echo "OK"

exit 0