#!/bin/bash

# ----------------------------------------------
# Test an OpenVPN server setup with a static key
# ----------------------------------------------

set -e

CONFIG_DIR=/etc/openvpn
STATIC_KEY=static.key
DEVICE=tun0
IP_SERVER=10.9.8.1
IP_CLIENT=10.9.8.2
LOG_FILE=$AUTOPKGTEST_TMP/openvpn.log

# Print information message to stdout
info() {
  echo "[I] $1"
}

info "Generate the static key inside the config directory"
cd $CONFIG_DIR
openvpn --genkey --secret $STATIC_KEY

info "Create the config file"
cat << EOF > $CONFIG_DIR/$DEVICE.conf
dev $DEVICE
ifconfig $IP_SERVER $IP_CLIENT
secret $CONFIG_DIR/$STATIC_KEY
EOF

info "Start an OpenVPN process in background and redirect its output to a file"
openvpn --config $CONFIG_DIR/$DEVICE.conf --verb 6 > $LOG_FILE &

info "Give some time to start the process, check if the TUN device is opened"
count=1
until [ -f $LOG_FILE ] && cat $LOG_FILE | grep "TUN/TAP device $DEVICE opened"; do
  [ $count -gt 9 ] && exit 5
  count=$(expr $count + 1)
  sleep 1
done

info "Check if the $DEVICE was created and if the state is UNKNOWN at this point"
ip address show $DEVICE | grep 'state UNKNOWN'

info "Check if OpenVPN is listening on port 1194 (default port)"
ss -lnptu | grep -E '([0-9]{1,3}\.){3}[0-9]{1,3}:1194.*users:\(\(\"openvpn\"'

info "Check if the $STATIC_KEY is used by OpenVPN"
cat $LOG_FILE | grep "shared_secret_file = '$CONFIG_DIR/$STATIC_KEY'"

info "Check if the $DEVICE is linked"
cat $LOG_FILE | grep "/sbin/ip link set dev $DEVICE up"

info "Check if the specified IP addresses were configured"
cat $LOG_FILE | grep "/sbin/ip addr add dev tun0 local $IP_SERVER peer $IP_CLIENT"

# Clean up: kill tha OpenVPN process, remove the $DEVICE created and $STATIC_KEY
cleanup() {
  pkill openvpn
  rm $CONFIG_DIR/$STATIC_KEY
}
trap cleanup INT TERM EXIT