#!/bin/sh /etc/rc.common
# Copyright (C) 2015 OpenWrt.org

START=50
STOP=10

USE_PROCD=1
PROG=/usr/lib/gnunet/libexec/gnunet-service-arm

GNUNET_HOME=/var/run/gnunet
# LOGFILE=$GNUNET_HOME/gnunet.log
CONFIGFILE=$GNUNET_HOME/gnunet.conf
SUID_ROOT_HELPERS="exit nat-server nat-client transport-bluetooth transport-wlan vpn"

chmodown_execbin() {
	execname=/usr/lib/gnunet/libexec/gnunet-$1
	if [ -x $execname ]; then
		[ "$3" ] && chown $3 $execname
		chmod $2 $execname
	fi
}

fix_libexec_permissions() {
	[ -e /usr/share/gnunet/.permfix ] && return
	for helper in $SUID_ROOT_HELPERS; do
		chmodown_execbin helper-$helper u+s
	done
	chmodown_execbin helper-dns 4750 root:gnunetdns
	chmodown_execbin service-dns 2750 gnunet:gnunetdns

	touch /usr/share/gnunet/.permfix
}

prepare_config() {
	if [ ! -e "$GNUNET_HOME" ]; then
		mkdir -p $GNUNET_HOME
		chown gnunet:gnunet $GNUNET_HOME
		chmod 0750 $GNUNET_HOME
	fi
	touch $CONFIGFILE
	chown gnunet:gnunet $CONFIGFILE
	chmod 0640 $CONFIGFILE
	gnunet-config -c $CONFIGFILE -s PATHS -o GNUNET_HOME -V $GNUNET_HOME

	# minimal persistency in /etc/gnunet
	[ ! -d /etc/gnunet ] && {
		mkdir -p /etc/gnunet
		chown gnunet:gnunet /etc/gnunet
	}

	# defaults paths for persistent files
	gnunet-config -c $CONFIGFILE -s PATHS -o GNUNET_CONFIG_HOME -V /etc/gnunet
	gnunet-config -c $CONFIGFILE -s PEER -o PRIVATE_KEY -V /etc/gnunet/private_key.ecc
	gnunet-config -c $CONFIGFILE -s identity -o EGODIR -V /etc/gnunet/identity/egos
	gnunet-config -c $CONFIGFILE -s revocation -o DATABASE -V /etc/gnunet/revocation.dat
	gnunet-config -c $CONFIGFILE -s nse -o PROOFFILE -V /etc/gnunet/proof.dat

	# enable all installed transport plugins
	transport_plugins=$(gnunet-config -c $CONFIGFILE -s transport -o PLUGINS)
	for transplug in /usr/lib/gnunet/libgnunet_plugin_transport_*.so; do
		transplug=$( echo $transplug |
			sed -ne 's!^.*_transport_\(.*\)\.so$!\1!p' )
		[ -n "$( echo $transport_plugins | grep $transplug )" ] ||
			transport_plugins="$transport_plugins $transplug"
	done
	gnunet-config -c $CONFIGFILE -s transport -o PLUGINS -V "$transport_plugins"

	# do not touch sysctl, iptables and routing
	gnunet-config -c $CONFIGFILE -s dns -o SKIP_ROUTING_SETUP -V YES
	gnunet-config -c $CONFIGFILE -s exit -o EXIT_IFNAME -V ''

	# apply config from UCI
	_gnunet_section=""
	config_cb()
	{
		# $1    "Type"
		# $2    "Name"
		local __TYPE="$1"
		local __NAME="${2/_/-}"
		[ "${__TYPE}" = "gnunet-config" ] && _gnunet_section="${__NAME}"
		[ "${__TYPE}" = "gnunet-exit-service" ] && _gnunet_section="${__NAME}.gnunet."
	}
	option_cb() {
		# $1    name of variable
		# $2    value
		local __OPT="$1"
		local __VAL="$2"
		gnunet-config -c $CONFIGFILE -s ${_gnunet_section} -o ${__OPT} -V "${__VAL}"
	}
	config_load gnunet

	return 0
}

start_service() {
	fix_libexec_permissions
	prepare_config

	procd_open_instance
	procd_set_param user gnunet
	procd_set_param command $PROG -c $CONFIGFILE
	[ "$LOGFILE" ] && procd_append_param command -l $LOGFILE
	procd_set_param respawn
	procd_close_instance
}