New script to manage VPN
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#!/bin/sh
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#
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# Purpose {{{
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# This script will try to manage VPN with forticlient
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# 1. Start a VPN will
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# a. Ensure forticlient systemd unit is started.
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# b. Try to connect to VPN with profile name.
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# 2. Stop a VPN will
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# a. Disconnect from the VPN.
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# b. Stop and disable forticlient systemd unit.
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# c. Restart systemd-resolved to ensure to have correct DNS resolvers.
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#
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# 2023-01-24
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# }}}
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# Flags {{{
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## Exit on error
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set -o errexit
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# }}}
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# Vars {{{
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PROGNAME=$(basename "${0}"); readonly PROGNAME
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PROGDIR=$(readlink -m $(dirname "${0}")); readonly PROGDIR
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ARGS="${*}"; readonly ARGS
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readonly NBARGS="${#}"
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[ -z "${DEBUG}" ] && DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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## Default values for some vars
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readonly REQUEST_STATUS_DEFAULT="start"
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readonly VPN_PROFILE_NAME_DEFAULT="Universite Rennes 1"
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VPN_USER_DEFAULT=$(whoami) ; readonly VPN_USER_DEFAULT
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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usage() { # {{{
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cat <<- HELP
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usage: $PROGNAME [-d|-h|-p|-u]
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Try to easily manage VPN with forticlient.
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EXAMPLES :
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- Start VPN with default profife name and default user
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${PROGNAME}
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- Stop the VPN
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${PROGNAME} stop
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- Start VPN with specific VPN user
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${PROGNAME} --user my_lambda_username start
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- Start VPN with specific VPN profile name
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${PROGNAME} --profile "My University name" start
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OPTIONS :
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-d,--debug
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Enable debug messages.
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-h,--help
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Print this help message.
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-p,--profile
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Define VPN profile name to use.
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Default : ${VPN_PROFILE_NAME_DEFAULT}
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-u,--user
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Define VPN user name to use.
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Default : ${VPN_USER_DEFAULT}
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For a first connection, try to start `forticlient gui` first to configure EMS
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and to check profile name.
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HELP
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}
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# }}}
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debug_message() { # {{{
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local_debug_message="${1}"
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## Print message if DEBUG is enable (=0)
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
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unset local_debug_message
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return 0
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}
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# }}}
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error_message() { # {{{
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local_error_message="${1}"
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local_error_code="${2}"
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## Print message
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printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
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unset local_error_message
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exit "${local_error_code:=66}"
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}
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# }}}
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define_vars() { # {{{
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## If request_status wasn't defined (argument) {{{
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if [ -z "${request_status}" ]; then
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## Use default value
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readonly request_status="${REQUEST_STATUS_DEFAULT}"
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fi
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## }}}
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## If vpn_profile_name wasn't defined (argument) {{{
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if [ -z "${vpn_profile_name}" ]; then
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## Use default value
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readonly vpn_profile_name="${VPN_PROFILE_NAME_DEFAULT}"
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fi
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## }}}
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## If vpn_user wasn't defined (argument) {{{
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if [ -z "${vpn_user}" ]; then
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## Use default value
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readonly vpn_user="${VPN_USER_DEFAULT}"
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fi
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## }}}
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}
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# }}}
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is_command_available() { # {{{
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local_command_available_cmd="${1}"
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debug_prefix="${2:-}"
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## Return False by default
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return_command_available="1"
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if [ "$(command -v ${local_command_available_cmd})" ]; then
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debug_message "${debug_prefix}is_command_available − \
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${RED}${local_command_available_cmd}${COLOR_DEBUG} seems present on this host."
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return_command_available="0"
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else
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debug_message "${debug_prefix}is_command_available − \
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${RED}${local_command_available_cmd}${COLOR_DEBUG} is not available on this host."
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return_command_available="1"
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fi
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unset local_command_available_cmd
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unset debug_prefix
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return "${return_command_available}"
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}
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# }}}
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main() { # {{{
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debug_message "--- MAIN BEGIN"
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## If forticlient command is not available {{{
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### Exit with error
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is_command_available "forticlient" "| " \
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|| error_message "forticlient is not in PATH, ensure the package is installed." 01
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## }}}
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## Define all vars
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define_vars
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debug_message "| Define vars"
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## If the VPN must be stopped {{{
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if [ "${request_status}" = "stop" ]; then
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debug_message "-- Disconnect VPN BEGIN"
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### If the VPN is still connected {{{
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forticlient_status=$(forticlient vpn status | head --lines=1 | sed 's/Status: \(.*\)/\1/' || error_message "Error while requesting current VPN status." 22)
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if [ "${forticlient_status}" = "Connected" ]; then
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debug_message "| VPN is ${RED}${forticlient_status}${COLOR_DEBUG}, try to disconnect it…"
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### Try to discconnect
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forticlient vpn disconnect > /dev/null \
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|| error_message "Error when disconnecting VPN." 11
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fi
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### }}}
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### Stop the systemd service {{{
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debug_message "| Try to stop and disable forticlient.service unit"
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sudo systemctl stop forticlient.service \
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|| error_message "Error while stopping forticlient.service unit" 12
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### Ensure to disable it
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sudo systemctl disable forticlient.service \
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|| error_message "Error while disabling forticlient.service unit" 13
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### }}}
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### Ensure to restart DNS resolver {{{
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debug_message "| Try to restart systemd-resolved.service unit to have correct DNS resolvers."
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sudo systemctl restart systemd-resolved.service \
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|| error_message "Error while restart systemd-resolved.service unit" 14
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### }}}
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debug_message "-- Disconnect VPN END"
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fi
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## }}}
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## If the VPN must be started {{{
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if [ "${request_status}" = "start" ]; then
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debug_message "-- Connect VPN BEGIN"
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#systemd_forticlient_status=$(sudo systemctl status forticlient.service | grep --word-regexp "Active:" | sed 's/Active: \(.*\)/\1/' || error_message "Error while requesting current VPN status." 22)
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### If forticlient.service unit is not started {{{
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systemd_forticlient_status=$(systemctl show forticlient.service | grep "^ActiveStat" | sed 's/.*=\(.*\)/\1/' || error_message "Error while requesting forticlient.service unit status." 21)
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if [ "${systemd_forticlient_status}" = "failed" ]; then
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debug_message "| Try to start forticlient.service unit."
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sudo systemctl restart forticlient.service \
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|| error_message "Error while (re)starting forticlient.service unit" 22
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fi
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### }}}
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### If forticlient.service unit is started {{{
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systemd_forticlient_status=$(systemctl show forticlient.service | grep "^ActiveStat" | sed 's/.*=\(.*\)/\1/' || error_message "Error while requesting forticlient.service unit status." 21)
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if [ "${systemd_forticlient_status}" = "active" ]; then
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debug_message "| forticlient.service unit is ${RED}started${COLOR_DEBUG}."
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fi
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### }}}
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### If the VPN is not connected {{{
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forticlient_status=$(forticlient vpn status | head --lines=1 | sed 's/Status: \(.*\)/\1/' || error_message "Error while requesting current VPN status." 23)
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if [ "${forticlient_status}" = "Not Running" ]; then
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### If script was started from a launcher {{{
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if [ -n "${DISPLAY}" ] && [ "${TERM}" = "linux" ]; then
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### Try to launch a new TERM_EMULATOR to ask the password
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"${TERM_EMULATOR}" -e forticlient vpn connect "${vpn_profile_name}" --password --user="${vpn_user}" \
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|| error_message "Error when connecting to VPN profile (${vpn_profile_name})." 24
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### }}}
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### Else we consider it was started from CLI {{{
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else
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### Try to connect
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forticlient vpn connect "${vpn_profile_name}" --password --user="${vpn_user}" \
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|| error_message "Error when connecting to VPN profile (${vpn_profile_name})." 25
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fi
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### }}}
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fi
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### }}}
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### If the VPN is connected {{{
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forticlient_status=$(forticlient vpn status | head --lines=1 | sed 's/Status: \(.*\)/\1/' || error_message "Error while requesting current VPN status." 25)
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if [ "${forticlient_status}" = "Connected" ]; then
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debug_message "| VPN is ${RED}${forticlient_status}${COLOR_DEBUG}."
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fi
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### }}}
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debug_message "-- Connect VPN END"
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fi
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## }}}
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debug_message "--- MAIN END"
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}
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# }}}
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true > /tmp/vpn.env
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env | sort >> /tmp/vpn.env
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# Manage arguments # {{{
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# This code can't be in a function due to argument management
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if [ ! "${NBARGS}" -eq "0" ]; then
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manage_arg="0"
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# Parse all argument one by one
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while printf -- '%s' "${1}" | grep -q -- "."; do
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case "${1}" in
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-d|--debug ) ## debug
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DEBUG=0
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debug_message "--- Manage argument BEGIN"
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;;
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-h|--help ) ## help
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usage
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## Exit after help informations
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exit 0
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;;
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--start|start ) ## Define request_status to start
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## Define var
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readonly request_status="start"
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;;
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--stop|stop ) ## Define request_status to stop
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## Define var
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readonly request_status="stop"
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;;
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-p|--profile ) ## Define vpn_profile_name with given arg
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## Move to the next argument
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shift
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## Define var
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readonly vpn_profile_name="${1}"
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;;
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-u|--user ) ## Define vpn_user with given arg
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## Move to the next argument
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shift
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## Define var
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readonly vpn_user="${1}"
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;;
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* ) ## unknow option
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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;;
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esac
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debug_message "| ${RED}${1}${COLOR_DEBUG} option managed."
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## Move to the next argument
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shift
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manage_arg=$((manage_arg+1))
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done
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debug_message "| ${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
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else
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debug_message "| No arguments/options to manage."
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fi
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debug_message "--- Manage argument END"
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# }}}
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main
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exit 0
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