rconfig

#!/bin/bash
#
# Copyright (c) 2020 by Thomas A. Early N7TAE
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

SetBooleanValue ()
{
	local dvname
	local cv
	if [ -z $2 ]; then
		if [ -z ${!1+x} ]; then
			if [[ "$1" == module_[abc]_* ]]; then
				echo matches
				dvname=${1//_[abc]_/_x_}
			else
				echo does not match
				dvname=${1}_d
			fi
			cv=${!dvname}
		else
			cv=${!1}
		fi
		if [[ $cv == [tT]* ]]; then
			eval ${1}=false
		else
			eval ${1}=true
		fi
	elif [[ "$2" == [tT]* ]]; then
		eval ${1}=true
	else
		eval ${1}=false
	fi
}

EvaluateVar ()
{
	if [ -z ${!1+x} ]; then
		if [ -z "${!2}" ]; then
			echo "'' <DEFAULT>"
		else
			echo "${!2} <DEFAULT>"
		fi
	else
		if [ -z "${!1}" ]; then
			echo "''"
		else
			echo "${!1}"
		fi
	fi
}

WriteMemFile ()
{
	local file
	file="$rcfg"
	echo "# created on `date`"                                  > $file
	[ -z ${callsign+x}    ] || echo    "callsign='$callsign'"  >> $file
	[ -z ${nummod+x}      ] || echo      "nummod=$nummod"      >> $file
	[ -z ${ip4addr+x}     ] || echo     "ip4addr='$ip4addr'"   >> $file
	[ -z ${ip6addr+x}     ] || echo     "ip6addr='$ip6addr'"   >> $file
	[ -z ${dbsupport+x}   ] || echo   "dbsupport=$dbsupport"   >> $file
}

WriteSRCHFile ()
{
	local file m
	file="$srch"
	echo "// Created on `date`" > $file
	echo "#define CALLSIGN \"${callsign}\"" >> $file
	if [ -z ${nummod+x} ]; then
		echo "#define NB_OF_MODULES ${nummod_d}" >> $file
	else
		echo "#define NB_OF_MODULES ${nummod}" >> $file
	fi
	if [ ! -z ${ip4addr+x} ]; then
		echo "#define LISTEN_IPV4 \"${ip4addr}\"" >> $file
	fi
	if [ ! -z ${ip6addr+x} ]; then
		echo "#define LISTEN_IPV6 \"${ip6addr}\"" >> $file
	fi
}

WriteSRCMKFile ()
{
	local file
	file="$srcm"
	echo "# Created on `date`" > $file
	if [ -z ${dbsupport+x} ]; then
		echo "debug = $dbsupport_d" >> $file
	else
		echo "debug = $dbsupport" >> $file
	fi
}

WriteCFGFiles ()
{
	WriteMemFile
	WriteSRCHFile
	WriteSRCMKFile
}

ListCFGFiles ()
{
	echo "===========${rcfg}============="
	cat $rcfg
	echo "===========${srch}============="
	cat $srch
	echo "===========${srcm}============="
	cat $srcm
}

# Execution starts here!
# file locations
rcfg='reflector.cfg'
srch='configure.h'
srcm='configure.mk'
mrefserv='/etc/systemd/system/mrefd.service'
# default values
callsign_d='CHNGME'
nummod_d=26
ip4addr_d='none'
ip6addr_d='none'
dbsupport_d=false

if [ -e reflector.cfg ]; then
	source reflector.cfg
else
	echo 'No configuration file found...'
	sleep 1
fi

if [ -z ${expertmode+x} ]; then
	if [ -e $mrefserv ]; then
		echo -n "You cannot change the configuration right now beacuse there is an m17 server running."
		echo "===========${rcfg}============="
		cat $rcfg
		echo
		echo "Please uninstall the running server before attempting to modify the configuration."
		exit 1
	fi
fi

key='x'
# main loop
while [[ "$key" != q* ]]
do
	clear
	echo
	echo "        Reflector Configuration, Version #200821"
	echo
	echo    "     ******* REFLECTOR ********"
	echo -n "cs : Reflector Callsign     = "; EvaluateVar callsign{,_d}
	echo -n "nm : Number of Modules      = "; EvaluateVar nummod{,_d}
	echo    "     ******* ADDRESSES ********"
	echo -n "i4 : IPv4 Listen Address    = "; EvaluateVar ip4addr{,_d}
	echo -n "i6 : IPv6 Listen Address    = "; EvaluateVar ip6addr{,_d}
	echo    "     ******* DEBUGGING ********"
	echo -n "db : Debugging Support      = "; EvaluateVar dbsupport{,_d}
	echo
	if [[ "$callsign" == M17-* ]]; then
		echo    "w  : Write configuration files (overwrites any existing files) and quit"
	fi
	echo    "q  : Quit without saving"
	echo    "u  : Unset the value of <key> (revert to the default value)."
	echo
	read -p "Please input <key> <value> - omit value to toggle a true/false : " key value garbage
	if [[ "$key" == cs*  && ${value^^} == M17-* ]]; then
		callsign="${value^^}"
		callsign="${callsign:0:7}"
	elif [[ "$key" == nm* ]]; then nummod="$value"
	elif [[ "$key" == i4* ]]; then ip4addr="$value"
	elif [[ "$key" == i6* ]]; then ip6addr="$value"
	elif [[ "$key" == db* ]]; then SetBooleanValue dbsupport "$value"
	elif [[ "$key" == w* ]]; then
		WriteCFGFiles
		ListCFGFiles
		exit 0
	elif [[ "$key" == u* ]]; then
		if   [[ "$value" == cs* ]]; then unset callsign
		elif [[ "$value" == nm* ]]; then unset nummod
		elif [[ "$value" == i4* ]]; then unset ip4addr
		elif [[ "$value" == i6* ]]; then unset ip6addr
		elif [[ "$value" == db* ]]; then unset dbsupport
		fi
	fi
done
exit 0