#!/bin/bash
#
# Copyright (C) 2023 Nikos Mavrogiannopoulos
#
# This file is part of ocserv.
#
# ocserv is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# ocserv is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GnuTLS; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

OCCTL="${OCCTL:-../src/occtl/occtl}"
SERV="${SERV:-../src/ocserv}"
srcdir=${srcdir:-.}
OCCTL_SOCKET=./occtl-ban-$$.socket
PIDFILE=ocserv-pid.$$.tmp
CPIDFILE=openpid.$$.tmp
OUTFILE=ban.$$.tmp

. `dirname $0`/random-net.sh
. `dirname $0`/common.sh
. `dirname $0`/ns.sh

eval "${GETPORT}"

function finish {
  set +e
  echo " * Cleaning up..."
  test -n "${PID}" && kill ${PID} >/dev/null 2>&1
  test -n "${PIDFILE}" && rm -f ${PIDFILE} >/dev/null 2>&1
  test -n "${CPIDFILE}" && rm -f ${CPIDFILE} >/dev/null 2>&1
  test -n "${CONFIG}" && rm -f ${CONFIG} >/dev/null 2>&1
  test -n "${OUTFILE}" && rm -f ${OUTFILE} >/dev/null 2>&1
}
trap finish EXIT

echo "Testing whether session timeout works as expected... "

update_config session-timeout.config
${CMDNS2} ${SERV} -p ${PIDFILE} -f -c ${CONFIG} -d 3 & PID=$!

sleep 5

echo "Connecting to obtain cookie... "
eval `echo "test" | ${CMDNS1} ${OPENCONNECT} --passwd-on-stdin -q ${ADDRESS}:${PORT} -u test --authenticate --servercert=pin-sha256:xp3scfzy3rOQsv9NcOve/8YVVv+pHr4qNCXEXrNl5s8=`

if [ -z "$COOKIE" ];then
	fail $PID "Could not obtain cookie"
fi

#echo "Cookie: $COOKIE"
sleep 10
echo ""
echo "Connecting with cookie... "
${CMDNS1} ${OPENCONNECT} ${ADDRESS}:${PORT} -u test -C "$COOKIE" --servercert=pin-sha256:xp3scfzy3rOQsv9NcOve/8YVVv+pHr4qNCXEXrNl5s8= --background --pid-file "${CPIDFILE}" --verbose >${OUTFILE}

sleep 4

if [ ! -f "${CPIDFILE}" ];then
	fail $PID "It was not possible to establish session!"
fi

TIME_LEFT=$(awk '/X-CSTP-Session-Timeout-Remaining/ {print $2}' ${OUTFILE})
if [ -z "${TIME_LEFT}" ];then
	fail $PID "No session timeout advertised by server!"
fi

# session-timeout is 25 seconds, and we have already waited 10s before reconnecting.
# So the remaining time should be no more than 15 seconds (25 - 10 = 15).
# If it is greater than this, it indicates the timeout was reset
# back to 25 seconds on the new connection (ref: issue #599)

if [ "${TIME_LEFT}" -gt 20 ];then
	fail $PID "Session timeout was reset to ${TIME_LEFT}s after reconnection!"
fi

echo "ping remote address"

set -e
${CMDNS1} ping -c 3 ${VPNADDR}
UPTIME=$(${CMDNS2} ${OCCTL} -s ${OCCTL_SOCKET} -j show user test | jq 'now - .[].raw_session_started_at | floor')
set +e

if [ -z "${UPTIME}" ];then
	fail $PID "Failed to retrieve session start time from occtl show user!"
fi
if [ "${UPTIME}" -lt 10 -o "${UPTIME}" -gt 60 ];then
	fail $PID "Session uptime ${UPTIME}s is outside the expected range (10–60 seconds)!"
fi

# We wait more than the configured time as session timeout is enforced every
# a couple of seconds.
echo "Waiting for session timeout... "
sleep 60

${CMDNS2} ${OCCTL} -s ${OCCTL_SOCKET} show user test
if test $? = 0;then
	fail $PID "Client listed in occtl after timeout!"
fi

${CMDNS1} ping -c 3 ${VPNADDR}
if test $? = 0;then
	fail $PID "Client remains connected after timeout!"
fi

sleep 5

echo "Connecting with cookie... "
rm -f "${CPIDFILE}"
${CMDNS1} ${OPENCONNECT} ${ADDRESS}:${PORT} -u test -C "$COOKIE" --servercert=pin-sha256:xp3scfzy3rOQsv9NcOve/8YVVv+pHr4qNCXEXrNl5s8= --background --pid-file "${CPIDFILE}"

sleep 4

if [ -f "${CPIDFILE}" ];then
	fail $PID "Established session with invalidated cookie!"
fi

exit 0