#!/bin/bash -x
# Small daemon to identify this machine to the OpenVPN server

# SEE /usr/bin/iiab-support for local_vars.yml var extraction explanation

# EMULATE ANSIBLE: but additionally Force Empty String Where Nec, e.g. whether
# local_vars.yml sets openvpn_handle to "" (or worst case null, or not at all!)
HANDLE=$(grep "^openvpn_handle:\s" /etc/iiab/local_vars.yml | tail -1 | sed "s/^openvpn_handle:\s\+//; s/#.*//; s/\s*$//; s/^\(['\"]\)\(.*\)\1$/\2/")

# ALSO GO 1 STEP FURTHER THAN ANSIBLE: convert remaining spaces to underscores,
# for OpenVPN server.  iiab-support emulates this, to help folks understand.
HANDLE=${HANDLE// /_}    # Same as "s/ /_/g"

# Likewise empty string is the worst case, e.g. if file doesn't exist.
# If $HANDLE is "", OpenVPN server tries to use the 1st 6 chars of UUID,
# e.g. e1a3d4 from e1a3d4e2-2d1a-4f37-9ba0-e836d7c8e3ca
# SEE "AUGUST 2018 - AUGUST 2021" RECAP ON TOP OF: roles/openvpn/tasks/main.yml
UUID=$(cat /etc/iiab/uuid)

/usr/bin/ncat -l -k -p1705 --exec "/bin/echo HANDLE = $HANDLE|UUID = $UUID" &



# 2021-08-18: Let's finally do it 3 years lster, simplifying from 4 places to 1
# at long last.  Per SSOT (single source of truth).

# #HANDLE=
# #UUID=
# #if [ -f /etc/iiab/openvpn_handle ]; then
#     # Option #1: Source directly from /etc/iiab/local_vars.yml in future?
#     # Option #2
#     HANDLE=$(cat /etc/iiab/openvpn_handle)    # Sets to "" if file doesn't exist (error is ok!)

# # Sourcing a variable from ~4 different places is a recipe for total confusion
# # (or worse!)  Far better to make variable openvpn_handle and file
# # /etc/iiab/openvpn_handle "obligatory" (EMPTY STRING "" IS TOLERATED, IN WHICH
# # CASE OPENVPN SERVER TRIES TO USE /etc/iiab/uuid BELOW, IN LIEU OF HANDLE...)

# # CLARIF: "systemctl restart openvpn" still works tolerably even if the above
# # is defied, auto-starting child service openvpn@xscenet per usual
# # (e.g. if /etc/iiab/openvpn_handle is deleted by accident!)

# #else
# #    # Option #3: Dangerous to invoke hypothetical variables :(
# #    source {{ iiab_env_file }}
# #    # Option #4: CAUSED FAILURES IN AUGUST 2018, invoking stale variable from {{ iiab_ini_file }}, but safer now that relegated to #4 ?
# #    if [ -z "$HANDLE" ]; then
# #        HANDLE=`cat {{ iiab_ini_file }} | gawk \
# #        '{ if((toupper($1) == "HANDLE") && ($2 == "=")) { print $3;}}'`
# #    fi
# #fi
# HANDLE=${HANDLE// /_}    # Change all spaces to underscores
# #if [ -f /etc/iiab/uuid ]; then
#     UUID=$(cat /etc/iiab/uuid)    # Sets to "" if file doesn't exist (error is ok!)
# #fi

# SERVER=/usr/bin/ncat
# #ID=$(printf "HANDLE = %s|UUID = %s" $HANDLE $UUID)
# #ID=$(echo "HANDLE = ${HANDLE}|UUID = ${UUID}")
# ID=$(echo "HANDLE = $HANDLE|UUID = $UUID")
# # August 2018: Removal of trailing '|' tested on Raspbian, Ubuntu 18.04 & Ubuntu 16.04
# #ID=`printf "HANDLE = %s|UUID = %s|" $HANDLE $UUID`

# # Start the daemon which will serve the handle on demand
# {% if is_debuntu %}
# $SERVER -l -k -p1705 --exec "/bin/echo $ID" &
# # 2020-11-23: USE 1 LINE INSTEAD OF 9 LINES, IF WE MANDATE debuntu:
# #/usr/bin/ncat -l -k -p1705 --exec "/bin/echo HANDLE = $HANDLE|UUID = $UUID" &
# {% else %}
# source /etc/init.d/functions
# PID_FILE=/var/run/openvpn/announce.pid
# daemon --pidfile=${PID_FILE} $SERVER "-l -k -p1705 --exec \"/usr/bin/echo $ID\"" &
# #daemon --pidfile=${PID_FILE} $SERVER "-l -k -p1705 --exec \"/usr/bin/echo $(printf 'HANDLE = %s|UUID = %s' $HANDLE $UUID)\"" &
# {% endif %}