githubmirror/swtpm

tests/common
913 строк18 KB
Stefan Berger
tests: Support filenames with spaces in some functions
05 ноя 2021, 13:39
05 ноя 2021, 13:3915b9ca6

SWTPM=swtpm
SWTPM_EXE=${SWTPM_EXE:-${ROOT}/src/swtpm/${SWTPM}}
SWTPM_IOCTL=${SWTPM_IOCTL:-${ROOT}/src/swtpm_ioctl/swtpm_ioctl}
SWTPM_BIOS=${SWTPM_BIOS:-${ROOT}/src/swtpm_bios/swtpm_bios}
SWTPM_SETUP=${SWTPM_SETUP:-${ROOT}/src/swtpm_setup/swtpm_setup}
SWTPM_CERT=${SWTPM_CERT:-${ROOT}/src/swtpm_cert/swtpm_cert}
ECHO=$(type -P echo)

case "$(uname -s)" in
Darwin)
	CERTTOOL=gnutls-certtool;;
*)
	CERTTOOL=certtool;;
esac

# Note: Do not use file descriptors above 127 due to OpenBSD.

# Kill a process quietly
# @1: signal, e.g. -9
# @2: pid
function kill_quiet()
{
  local sig="$1"
  local pid="$2"

  bash -c "kill $sig $pid &>/dev/null"
  return $?
}

# Wait for a regular file to appear and for it to have > 0 bytes
#
# @1: filename
# @2: timeout in seconds
function wait_for_file()
{
  local filename="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    [ -f "${filename}" ] && [ $(get_filesize ${filename}) != 0 ] && {
      return 1
    }
    sleep 0.1
  done
  return 0
}

# Wait for a regular file to disappear
#
# @1: filename
# @2: timeout in seconds
function wait_file_gone()
{
  local filename="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    [ -f "${filename}" ] || return 1
    sleep 0.1
  done
  return 0
}

# Wait for a process with given PID to be gone
#
# @1: pid
# @2: timeout in seconds
function wait_process_gone()
{
  local pid="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    kill_quiet -0 ${pid} || return 1
    sleep 0.1
  done
  return 0
}

# Wait for a chardev to appear
#
# @1: filename
# @2: timeout in seconds
function wait_for_chardev()
{
  local filename="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    [ -c "${filename}" ] && return 1
    sleep 0.1
  done
  return 0
}

# Wait for a chardev to disappear
#
# @1: filename
# @2: timeout in seconds
function wait_chardev_gone()
{
  local filename="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    [ -c "${filename}" ] || return 1
    sleep 0.1
  done
  return 0
}

# Wait for a socket file to appear
#
# @1: filename
# @2: timeout in seconds
function wait_for_socketfile()
{
  local filename="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    [ -S "${filename}" ] && return 1
    sleep 0.1
  done
  return 0
}

# Wait for a socket file to disappear
#
# @1: filename
# @2: timeout in seconds
function wait_socketfile_gone()
{
  local filename="$1"
  local timeout="$2"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    [ -S "${filename}" ] || return 1
    sleep 0.1
  done
  return 0
}

# Wait for a server socket to appear
#
# @1: port
# @2: host
# @3: timeout in seconds
function wait_for_serversocket()
{
  local port="$1"
  local host="$2"
  local timeout="$3"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    (exec 127<>/dev/tcp/${host}/${port}) &>/dev/null
    [ $? -eq 0 ] && return 1
    sleep 0.1
  done
  return 0
}

# Wait for a server socket to disappear
#
# @1: port
# @2: host
# @3: timeout in seconds
function wait_serversocket_gone()
{
  local port="$1"
  local host="$2"
  local timeout="$3"

  local loops=$((timeout * 10)) loop

  for ((loop=0; loop<loops; loop++)); do
    (exec 127<>/dev/tcp/${host}/${port}) &>/dev/null
    [ $? -eq 0 ] || return 1
    sleep 0.1
  done
  return 0
}

# Wait for a TCP port to open for listening
# @1: port
# @2: id of process to open port
# @3: timeout in seconds
function wait_port_open()
{
	local port=$1
	local pid=$2
	local timeout=$3

	local loops=$((timeout * 10)) loop
	local NETSTAT=$(type -P netstat)

	for ((loop = 0; loop < loops; loop++)); do
		if [ -n "$NETSTAT" ]; then
			if [ -n "$(netstat -naptl 2>/dev/null |
				   grep "LISTEN" |
				   grep " $pid/" |
				   grep ":$port ")" ]; then
				return 1
			fi
		else
			if [ -n "$(ss -nptl |
				   grep ",pid=${pid}," |
				   grep ":$port ")" ]; then
				return 1
			fi
		fi
		sleep 0.1
	done
	return 0
}

# Wait for a TCP listening port to close
# @1: port
# @2: id of process to close port
# @3: timeout in seconds
function wait_port_closed()
{
	local port=$1
	local pid=$2
	local timeout=$3

	local loops=$((timeout * 10)) loop
	local NETSTAT=$(type -P netstat)

	for ((loop = 0; loop < loops; loop++)); do
		if [ -n "$NETSTAT" ]; then
			if [ -z "$(netstat -naptl 2>/dev/null |
				   grep "LISTEN" |
				   grep " $pid/" |
				   grep ":$port ")" ]; then
				return 1
			fi
		else
			if [ -z "$(ss -nptl |
				   grep ",pid=${pid}," |
				   grep ":$port ")" ]; then
				return 1
			fi
		fi
		sleep 0.1
	done
	return 0
}

# Run the swtpm_ioctl command
#
# @param1: type of interface
function run_swtpm_ioctl()
{
	local iface=$1; shift

	case "${iface}" in
	cuse)
		[ -z "${SWTPM_DEV_NAME}" ] && {
			echo "SWTPM_DEV_NAME not defined"
			exit 1
		}
		${SWTPM_IOCTL} $@ ${SWTPM_DEV_NAME}
		return $?
		;;
	socket+socket|unix+socket)
		[ -z "${SWTPM_SERVER_NAME}" ] && {
			echo "SWTPM_SERVER_NAME not defined"
			exit 1
		}
		[ -z "${SWTPM_SERVER_PORT}" ] && {
			echo "SWTPM_SERVER_PORT not defined"
			exit 1
		}
		${SWTPM_IOCTL} \
			--tcp ${SWTPM_SERVER_NAME}:${SWTPM_CTRL_PORT} \
			$@
		return $?
		;;
	socket+unix|unix+unix)
		[ -z "${SWTPM_CTRL_UNIX_PATH}" ] && {
			echo "SWTPM_CTRL_UNIX_PATH not defined"
			exit 1
		}
		${SWTPM_IOCTL} \
			--unix ${SWTPM_CTRL_UNIX_PATH} \
			$@
		return $?
		;;
	esac
}

# Start the swtpm in the background
#
# @param1: type of interface
# @param2.. : parameters to pass to 'swtpm'
function run_swtpm()
{
	local iface=$1; shift
	local swtpm_server_disconnect=""

	echo "==== Starting swtpm with interfaces ${iface} ===="
	if [ -z "${SWTPM_SERVER_NO_DISCONNECT}" ]; then
		swtpm_server_disconnect=",disconnect"
	fi

	case "${iface}" in
	cuse)
		[ -z "${SWTPM_DEV_NAME}" ] && {
			echo "SWTPM_DEV_NAME not defined"
			exit 1
		}

		if wait_chardev_gone ${SWTPM_DEV_NAME} 2; then
			echo "${SWTPM_DEV_NAME} is still there and may be used."
			exit 1
		fi

		${SWTPM_EXE} cuse "$@" ${SWTPM_TEST_SECCOMP_OPT} \
			-n ${SWTPM_DEV_NAME##*/}
		rc=$?
		if [ $rc -ne 0 ]; then
			echo "Could not run ${SWTPM_EXE} using ${iface}"
			exit 1
		fi
		if wait_for_chardev ${SWTPM_DEV_NAME} 2; then
			echo "$SWTPM_DEV_NAME did not appear"
			exit 1
		fi

		SWTPM_PID=$(ps aux |
		            grep "cuse" |
		            grep -E " ${SWTPM_DEV_NAME##*/}\$" |
		            grep -v grep |
		            gawk '{print $2}')
		return $?
		;;
	socket+socket)
		[ -z "${SWTPM_SERVER_PORT}" ] && {
			echo "SWTPM_SERVER_PORT not defined"
			exit 1
		}
		[ -z "${SWTPM_CTRL_PORT}" ] && {
			echo "SWTPM_CTRL_PORT not defined"
			exit 1
		}

		if wait_serversocket_gone "${SWTPM_SERVER_PORT}" 127.0.0.1 2; then
			echo "Port ${SWTPM_SERVER_PORT} is still used"
			exit 1
		fi
		if wait_serversocket_gone "${SWTPM_CTRL_PORT}" 127.0.0.1 1; then
			echo "Port ${SWTPM_CTRL_PORT} is still used"
			exit 1
		fi

		${SWTPM_EXE} socket "$@" \
			${SWTPM_TEST_SECCOMP_OPT} \
			--server type=tcp,port=${SWTPM_SERVER_PORT}${swtpm_server_disconnect} \
			--ctrl type=tcp,port=${SWTPM_CTRL_PORT} &
		rc=$?
		if [ $rc -ne 0 ]; then
			echo "Could not run ${SWTPM_EXE} using ${iface}"
			exit 1
		fi
		SWTPM_PID=$!
		if wait_for_serversocket "${SWTPM_SERVER_PORT}" 127.0.0.1 2; then
			echo "Server did not open port ${SWTPM_SERVER_PORT}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		if wait_for_serversocket "${SWTPM_CTRL_PORT}" 127.0.0.1 1; then
			echo "Server did not open port ${SWTPM_CTRL_PORT}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		return 0
		;;
	socket+unix)
		[ -z "${SWTPM_SERVER_PORT}" ] && {
			echo "SWTPM_SERVER_PORT not defined"
			exit 1
		}
		[ -z "${SWTPM_CTRL_UNIX_PATH}" ] && {
			echo "SWTPM_CTRL_UNIX_PATH not defined"
			exit 1
		}

		if wait_serversocket_gone "${SWTPM_SERVER_PORT}" 127.0.0.1 2; then
			echo "Port ${SWTPM_SERVER_PORT} is still used"
			exit 1
		fi
		if wait_socketfile_gone "${SWTPM_CTRL_UNIX_PATH}" 2; then
			echo "Unix socket ${SWTPM_CTRL_UNIX_PATH} is still there"
			exit 1
		fi

		${SWTPM_EXE} socket "$@" \
			${SWTPM_TEST_SECCOMP_OPT} \
			--server type=tcp,port=${SWTPM_SERVER_PORT}${swtpm_server_disconnect} \
			--ctrl type=unixio,path=${SWTPM_CTRL_UNIX_PATH} &
		rc=$?
		if [ $rc -ne 0 ]; then
			echo "Could not run ${SWTPM_EXE} using ${iface}"
			exit 1
		fi
		[ $rc -ne 0 ] && return $rc
		SWTPM_PID=$!
		if wait_for_serversocket "${SWTPM_SERVER_PORT}" 127.0.0.1 2; then
			echo "Server did not open port ${SWTPM_SERVER_PORT}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		if wait_for_socketfile ${SWTPM_CTRL_UNIX_PATH} 1; then
			echo "Server did not create UnixIO socket ${SWTPM_CTRL_UNIX_PATH}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		return 0
		;;
	unix+socket)
		[ -z "${SWTPM_CMD_UNIX_PATH}" ] && {
			echo "SWTPM_CMD_UNIX_PATH not defined"
			exit 1
		}
		[ -z "${SWTPM_CTRL_PORT}" ] && {
			echo "SWTPM_CTRL_PORT not defined"
			exit 1
		}

		if wait_socketfile_gone "${SWTPM_CMD_UNIX_PATH}" 2; then
			echo "Unix socket ${SWTPM_CMD_UNIX_PATH} is still there"
			exit 1
		fi
		if wait_serversocket_gone "${SWTPM_CTRL_PORT}" 127.0.0.1 1; then
			echo "Port ${SWTPM_CTRL_PORT} is still used"
			exit 1
		fi

		${SWTPM_EXE} socket "$@" \
			${SWTPM_TEST_SECCOMP_OPT} \
			--server type=unixio,path=${SWTPM_CMD_UNIX_PATH} \
			--ctrl type=tcp,port=${SWTPM_CTRL_PORT} &
		rc=$?
		if [ $rc -ne 0 ]; then
			echo "Could not run ${SWTPM_EXE} using ${iface}"
			exit 1
		fi
		SWTPM_PID=$!
		if wait_for_socketfile ${SWTPM_CMD_UNIX_PATH} 2; then
			echo "Server did not create UnixIO socket ${SWTPM_CMD_UNIX_PATH}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		if wait_for_serversocket "${SWTPM_CTRL_PORT}" 127.0.0.1 1; then
			echo "Server did not open port ${SWTPM_CTRL_PORT}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		return 0
		;;
	unix+unix)
		[ -z "${SWTPM_CMD_UNIX_PATH}" ] && {
			echo "SWTPM_CMD_UNIX_PATH not defined"
			exit 1
		}
		[ -z "${SWTPM_CTRL_UNIX_PATH}" ] && {
			echo "SWTPM_CTRL_UNIX_PATH not defined"
			exit 1
		}

		if wait_socketfile_gone "${SWTPM_CMD_UNIX_PATH}" 2; then
			echo "Unix socket ${SWTPM_CMD_UNIX_PATH} is still there"
			exit 1
		fi
		if wait_socketfile_gone "${SWTPM_CTRL_UNIX_PATH}" 2; then
			echo "Unix socket ${SWTPM_CTRL_UNIX_PATH} is still there"
			exit 1
		fi

		${SWTPM_EXE} socket "$@" \
			${SWTPM_TEST_SECCOMP_OPT} \
			--server type=unixio,path=${SWTPM_CMD_UNIX_PATH} \
			--ctrl type=unixio,path=${SWTPM_CTRL_UNIX_PATH} &
		rc=$?
		if [ $rc -ne 0 ]; then
			echo "Could not run ${SWTPM_EXE} using ${iface}"
			exit 1
		fi
		SWTPM_PID=$!
		if wait_for_socketfile ${SWTPM_CMD_UNIX_PATH} 2; then
			echo "Server did not create UnixIO socket ${SWTPM_CMD_UNIX_PATH}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		if wait_for_socketfile ${SWTPM_CTRL_UNIX_PATH} 1; then
			echo "Server did not create UnixIO socket ${SWTPM_CTRL_UNIX_PATH}"
			kill -9 ${SWTPM_PID}
			exit 1
		fi
		return 0
		;;
	esac
}

# Open the command channel/device on fd 100
#
# @param1: type of interface
# @param2: must be '100'
function swtpm_open_cmddev()
{
	local iface=$1; shift

	[ "$1" != "100" ] && {
		echo "swtpm_opendev: Filedescriptor must be 100"
		exit 1
	}

	case "${iface}" in
	cuse)
		[ -z "${SWTPM_DEV_NAME}" ] && {
			echo "SWTPM_DEV_NAME not defined"
			exit 1
		}
		exec 100<>${SWTPM_DEV_NAME}
		return $?
		;;
	socket+socket|socket+unix)
		[ -z "${SWTPM_SERVER_NAME}" ] && {
			echo "SWTPM_SERVER_NAME not defined"
			exit 1
		}
		[ -z "${SWTPM_SERVER_PORT}" ] && {
			echo "SWTPM_SERVER_PORT not defined"
			exit 1
		}
		# Must first close on OS/X
		exec 100>&-
		exec 100<>/dev/tcp/${SWTPM_SERVER_NAME}/${SWTPM_SERVER_PORT}
		return $?
		;;
	unix+socket|unix+unix)
		;;
	*)
		echo "swtpm_opendev: unsupported interface $iface"
		exit 1
	esac
}

# Transmit a command on fd 100
#
# @param1: type of interface
function swtpm_cmd_tx()
{
	local iface=$1
	local cmd_path resp_path

	cmd_path=$(mktemp)

	case "${iface}" in
	cuse)
		echo -en "$2" > ${cmd_path}
		cat ${cmd_path} >&100
		dd if=/proc/self/fd/100 2>/dev/null | \
		    od -t x1 -A n | \
		    tr -s ' ' | \
		    tr -d '\n' | \
		    sed 's/ $//g'
		;;
	socket+socket|socket+unix)
		echo -en "$2" > ${cmd_path}
		cat ${cmd_path} >&100
		cat <&100 | od -t x1 -A n | \
                   tr -s ' ' | \
                   tr -d '\n' | \
                   sed 's/ $//g'
		;;
	unix+socket|unix+unix)
		echo -en "$2" > ${cmd_path}
		socat -x -t50 \
			FILE:${cmd_path},rdonly \
			UNIX-CLIENT:${SWTPM_CMD_UNIX_PATH} 2>&1 | \
		  sed -n '/^ /p' | \
		  tail -n1
		;;
	*)
		echo "swtpm_opendev: unsupported interface $iface"
		rm -f ${cmd_path}
		exit 1
	esac

	rm -f ${cmd_path}
}

# Transmit a control command on fd 101
#
# @param1: type of interface
function swtpm_ctrl_tx()
{
	local iface=$1
	local ctrl_path resp_path

	case "${iface}" in
	socket+socket|unix+socket)
		$ECHO -en "$2" >&101
		cat <&101 | od -t x1 -A n -w128
		;;
	socket+unix|unix+unix)
		ctrl_path=$(mktemp)
		echo -en "$2" > ${ctrl_path}
		socat -x -t50 \
			FILE:${ctrl_path},rdonly \
			UNIX-CLIENT:${SWTPM_CTRL_UNIX_PATH} 2>&1 | \
		  sed -n '/^ /p' | \
		  tail -n1
		rm -f ${ctrl_path}
		;;
	*)
		echo "swtpm_opendev: unsupported interface $iface"
		exit 1
	esac
}


# Run swtpm_bios
#
# @param1: type of interface
# @param2 ...: parameters to pass to swtpm_bios
function run_swtpm_bios()
{
	local iface=$1

	shift

	case "${iface}" in
	cuse)
		[ -z "${SWTPM_DEV_NAME}" ] && {
			echo "SWTPM_DEV_NAME not defined"
			exit 1
		}
		${SWTPM_BIOS} --tpm-device ${SWTPM_DEV_NAME} $@
		return $?
		;;
	unix+unix|unix+socket)
		[ -z "${SWTPM_CMD_UNIX_PATH}" ] && {
			echo "SWTPM_CMD_UNIX_PATH not defined"
			exit 1
		}
		${SWTPM_BIOS} --unix ${SWTPM_CMD_UNIX_PATH} $@
		return $?
		;;
	socket+unix|socket+socket)
		[ -z "${SWTPM_SERVER_PORT}" ] && {
			echo "SWTPM_SERVER_PORT not defined"
			exit 1
		}
		${SWTPM_BIOS} --tcp ${SWTPM_SERVER_NAME}:${SWTPM_SERVER_PORT} $@
		return $?
		;;
	*)
		echo "run_swtpm_bios: unsupported interface $iface"
		exit 1
	esac
}

# Get the size of a file in bytes
#
# @1: filename
function get_filesize()
{
	if [[ "$(uname -s)" =~ (Linux|CYGWIN_NT-) ]]; then
		stat -c%s "$1"
	else
		# OpenBSD
		stat -f%z "$1"
	fi
}

# Get the file mode bits in octal format
#
# @1: filename
function get_filemode()
{
	if [[ "$(uname -s)" =~ (Linux|CYGWIN_NT-) ]]; then
		stat -c%a "$1"
	else
		# BSDs
		stat -f%Lp "$1"
	fi
}

# Get the file owner uid and gid
#
# @1: filename
function get_fileowner()
{
	if [[ "$(uname -s)" =~ (Linux|CYGWIN_NT-) ]]; then
		stat -c"%u %g" "$1"
	else
		# BSDs
		stat -f"%u %g" "$1"
	fi
}

# Get the file owner user name and group name
#
# @1: filename
function get_fileowner_names()
{
	if [[ "$(uname -s)" =~ (Linux|CYGWIN_NT-) ]]; then
		stat -c"%U %G" "$1"
	else
		# BSDs
		stat -f"%Su %Sg" "$1"
	fi
}

# Get the SHA1 of a file
#
# @1: filename
function get_sha1_file()
{
	if ! [ -r "$1" ]; then
		echo "[file $1 does not exist]"
		return
	fi
	case "$(uname -s)" in
	Linux|CYGWIN*)
		sha1sum "$1" | cut -f1 -d" "
		;;
	Darwin)
		shasum "$1" | cut -f1 -d" "
		;;
	*)
		# OpenBSD
		sha1 "$1" | cut -d "=" -f2 | tr -d " "
	esac
}

# Display process that have the same name
#
# @1: process name to match
function display_processes_by_name()
{
	local name="$1"

	if [ 1 -eq 0 ]; then
		ps aux | grep "${name}" | grep -v grep
	fi
}

# Check whether seccomp support is compiled in
#
# @1: path to swtpm
#
# Returns 0 if seccomp is supported, 1 otherwise
function has_seccomp_support()
{
	local swtpm_exe="$1"

	local tmp=$(${swtpm_exe} socket --help | grep -E "\-\-seccomp")

	[ -n "${tmp}" ] && return 0
	return 1
}

# Check whether the given process runs with the given seccomp
# profile type IF the given swtpm executable has seccomp support
#
# @1: Path to swtpm executable from which process was started
# @2: The process ID
# @3: The expected seccomp profile type
function check_seccomp_profile()
{
	local swtpm_exe="$1"
	local swtpm_pid="$2"
	local profile="$3"

	local tmp

	if ! has_seccomp_support "${swtpm_exe}"; then
		return 0
	fi
	if [ -n "${SWTPM_TEST_SECCOMP_OPT}" ]; then
		return 0
	fi

	tmp=$(grep -E "^Seccomp" /proc/self/status |
		cut -d":" -f2 |
		tr -d '\t')
	if [ "${tmp}" != "0" ]; then
		echo "check_seccomp_profile: skipping check since test env." \
		"runs with in a seccomp profile overriding --seccomp"
		return 0
	fi

	tmp=$(grep -E "^Seccomp" /proc/${swtpm_pid}/status |
		cut -d":" -f2 |
		tr -d '\t')
	if [ "${tmp}" != ${profile} ]; then
		echo "Process ${swtpm_pid} has wrong seccomp profile type"
		echo "Expected: ${profile}"
		echo "Actual  : ${tmp}"
		return 1
	fi
	return 0
}

# Validate the content of the pid file
# @1: Expected PID
# @2: pid file filename
function validate_pidfile()
{
	local pid="$1"
	local pidfile="$2"
	local rpid="$(cat $pidfile)"

	if [ -z "$rpid" ]; then
		sleep 0.1
		rpid="$(cat $pidfile)"
	fi

	if [ "$pid" != "$rpid" ]; then
		echo "Error: pid file contains unexpected PID value."
		echo "expected: $pid"
		echo "actual  : $(cat $pidfile)"
		exit 1
	fi
}

# Check whether swtpm can use a TPM 1.2
function skip_test_no_tpm12()
{
	local swtpm_exe="$1"

	local res=$(${swtpm_exe} socket --print-capabilities | grep '"tpm-1.2"')
	if [ -z "${res}" ]; then
		echo "${swtpm_exe} does not provide a TPM 1.2"
		exit 77
	fi
}

# Check whether swtpm can use a TPM 2.0
function skip_test_no_tpm20()
{
	local swtpm_exe="$1"

	local res=$(${swtpm_exe} socket --print-capabilities | grep '"tpm-2.0"')
	if [ -z "${res}" ]; then
		echo "${swtpm_exe} does not provide a TPM 2.0"
		exit 77
	fi
}

# Test whether swtpm has a chardev interface; Returns 0 if true, 1 otherwise
function test_swtpm_has_chardev()
{
	local swtpm_exe="$1"

	local res=$(${swtpm_exe} chardev --help 2>&1 |
		    grep "Unsupported TPM interface")
	if [ -z "${res}" ]; then
		return 0
	fi
	return 1
}

# Skip test if swtpm does not support chardev interface
function skip_test_no_chardev()
{
	local swtpm_exe="$1"

	if ! test_swtpm_has_chardev "${swtpm_exe}"; then
		echo "${swtpm_exe} does not support chardev interface"
		exit 77
	fi
}

# Check whether swtpm links with ASAN
function skip_test_linked_with_asan()
{
	local swtpm_exe="$1"

	local act_exe

	if [[ "$(uname -s)" =~ Linux ]]; then
		if [ -z "$(file "${swtpm_exe}" | grep ELF)" ]; then
			act_exe="$(dirname "${swtpm_exe}")"/.libs/"$(basename "${swtpm_exe}")"
		else
			act_exe="${swtpm_exe}"
		fi
		if [ -n "$(nm "${act_exe}" | grep __asan_)" ]; then
			echo "${act_exe} is built with ASAN"
			exit 77
		fi
	fi
}