#!/bin/sh /etc/rc.common

USE_PROCD=1
START=30
EXTRA_COMMANDS="get_key probeid log create_backup load_backup create_key"
EXTRA_HELP="	get_key	print probe public key (used for probe registration)
	probeid	print probe id
	log	print probe status log
	create_backup 	backup ssh key to tar.gz
	load_backup 'backup.tar.gz' 	load backup ssh key from tar.gz
	create_key create probe priv/pub key 
"

SCRIPTS_DIR="/usr/libexec/atlas-probe-scripts"
TMP_BASE_DIR="/tmp/ripe_atlas_probe"
PUB_KEY_FILE="$SCRIPTS_DIR/etc/probe_key.pub"
PRIV_KEY_FILE="$SCRIPTS_DIR/etc/probe_key"
PROBE_ID_FILE="$TMP_BASE_DIR/status/reg_init_reply.txt"
LOG_FILE="/tmp/log/ripe_sw_probe"
STATE_CONFIG="$SCRIPTS_DIR/state/config.txt"

load_backup() {
	local backup_arch
	local tmp_dir

	backup_arch="$1"
	tmp_dir="$(mktemp -u -p /var/run/atlas)"
	if [ -f "$backup_arch" ]; then
		safe_mkdir "$tmp_dir"
		tar -xzf "$backup_arch" -C "$tmp_dir/"
		if [ -f "$tmp_dir/probe_key.pub" ] && [ -f "$tmp_dir/probe_key" ]; then
			mv "$tmp_dir/probe_key.pub" "$PUB_KEY_FILE"
			mv "$tmp_dir/probe_key" "$PRIV_KEY_FILE"
			rm -rf "$tmp_dir"
			print_msg "Info: public and private key loaded from backup"
		else
			print_msg "Error: Could not extract probe_key or probe_key form backup archive"
			rm -rf "$tmp_dir"
			exit 1
		fi
	else
		print_msg "Error: Provided backup file $backup_arch does not exists"
		exit 1
	fi
}

create_backup() {
	local back_dir

	back_dir="$(pwd)"

	if [ -f "$PUB_KEY_FILE" -a -f "$PRIV_KEY_FILE" ]; then
		print_msg "Info: Creating backup arch in $back_dir"
		tar -czf "$back_dir/atlas-key-backup.tar.gz" -C "$SCRIPTS_DIR/etc" probe_key probe_key.pub
	else
		print_msg "Error: private or public key does not exists."
		exit 1
	fi
}

create_key() {
	local username
	local probe_key=/etc/atlas/probe_key
	local probe_pub_key=/etc/atlas/probe_key.pub

	config_load atlas

	config_get username "common" username

	if [ -f "$PRIV_KEY_FILE" ]; then
		if [ ! -f $probe_key ]; then
			print_msg "Missing probe_key in /etc/atlas"
			print_msg "The key will be lost on sysupgrade. Cosider moving the keys in /etc/atlas and create a link in the $SCRIPTS_DIR/etc/ dir."
		fi

		print_msg "probe_key already present. Exiting..."
		exit 1
	fi

	if [ -z "$username" ]; then
		print_msg "Username not set in atlas config file. Enter your ripe-atlas username."
		exit 1
	fi

	if [ -n "$(which ssh-keygen)" ]; then
		ssh-keygen -t rsa -b 2048 -f $probe_key -N ""
		sed -i "s/ \S*$/ "$username"/" $probe_pub_key
	elif [ -n "$(which dropbearkey)" ] && [ -n "$(which dropbearconvert)" ]; then
		local public_key

		public_key="$(dropbearkey -t rsa -f /etc/atlas/probe_key_dropbear -s 2048 | sed -n 2p)"
		public_key="$(echo "$public_key" | sed "s/ \S*$/ "$username"/")"
		echo $public_key > $probe_pub_key
		dropbearconvert dropbear openssh /etc/atlas/probe_key_dropbear $probe_key
		rm /etc/atlas/probe_key_dropbear
	else
		print_msg "Can't find a way to generate key."
		exit 1
	fi

	#Link priv/pub key
	[ -f $PRIV_KEY_FILE ] || ln -s $probe_key $PRIV_KEY_FILE
	[ -f $PUB_KEY_FILE ] || ln -s $probe_pub_key $PUB_KEY_FILE

	#Fix permission
	chown atlas $probe_key $probe_pub_key
	chgrp atlas $probe_key $probe_pub_key
	chmod 644 $probe_key $probe_pub_key

	print_msg "Key generated successfully. Use the get_key command to show the public key and get instruction on how to register your probe."
}

log() {
	if [ -f "$LOG_FILE" ];then
		tail "$LOG_FILE"
	else
		print_msg "Error. No log file found. Probe isn't probably running"
		exit 1
	fi
}

get_key() {
	if [ -f "$PUB_KEY_FILE" ]; then
		echo "Probe public key (use for registration)"
		echo "URL with registration form https://atlas.ripe.net/apply/swprobe/"
		echo "=========================================="
		cat "$PUB_KEY_FILE"
	else
		print_msg "Error! Pub. key not found"
		exit 1
	fi
}

probeid() {
	local probe_id

	if [ -f "$PROBE_ID_FILE" ]; then
		probe_id="$(awk '/PROBE_ID/ {print $2}' "$PROBE_ID_FILE")"
		if [ -z "$probe_id" ]; then
			print_msg "Probe ID not found SW probe isn't probably registered yet"
			exit 1
		else
			print_msg "Probe ID is $probe_id"
		fi
	else
		print_msg "Probe ID not found. SW probe is not running or probe_key isn't registered yet"
		exit 1
	fi
}

print_msg() {
	echo "$1" >&2
	logger -t atlas-sw-probe "$1"
}

stop_service() {
	local atlas_pid
	local tunnel_pid
	local pid_file

	print_msg "Stopping atlas sw probe"
	print_msg "Kill all atlas processes"

	for pid_file in "$SCRIPTS_DIR/run/"*.vol; do
		[ -f "$pid_file" ] || continue
		# test if proccess is still running
		atlas_pid="$(cat "$pid_file")"
		if kill -0 "$atlas_pid" 2>/dev/null; then
			kill "$atlas_pid"
		fi
	done

	if [ -f "$SCRIPTS_DIR/status/con_keep_pid.vol" ]; then
		print_msg "Kill ssh tunnel"
		tunnel_pid="$(cat "$SCRIPTS_DIR/status/con_keep_pid.vol")"
		if kill -0 "$tunnel_pid" 2>/dev/null; then
			kill "$tunnel_pid"
		fi
	fi

	# Clean run dir
	rm -r $TMP_BASE_DIR
}

safe_mkdir() {
    local dir="$1"
    if [ -e "$dir" ] && [ ! -d "$dir" -o -L "$dir" ]; then
        rm -rf "$dir"
    fi
    mkdir -p "$dir"
    chmod 700 "$dir"
    chown root:root "$dir"
}

create_tmp_dirs() {
	local dirs

	chown -R atlas:atlas "$SCRIPTS_DIR/bin"
	chmod 755 "$SCRIPTS_DIR/bin"
	dirs='crons data run status'

	safe_mkdir "$TMP_BASE_DIR"
	for i in $dirs;	do
		safe_mkdir "$TMP_BASE_DIR/$i"
	done
}

start_service() {
	local log_stderr
	local log_stdout
	local rxtxrpt
	local test_setting
	local probe_key=/etc/atlas/probe_key
	local probe_pub_key=/etc/atlas/probe_key.pub

	# The link is not saved across sysupgrade, recreate if missing
	if [ ! -f $PRIV_KEY_FILE ]; then
		[ -f $probe_key ] && ln -s $probe_key $PRIV_KEY_FILE
		[ -f $probe_pub_key ] && ln -s $probe_pub_key $PUB_KEY_FILE
	fi

	# With the precheck done, check if the priv key is actually present
	if [ ! -f $PRIV_KEY_FILE ]; then
		print_msg "Missing probe_key. To init the key follow instruction in /etc/atlas/atlas.readme"
		print_msg "Assuming atlas-sw-probe not init. Exiting..."
		exit 1
	fi

	create_tmp_dirs

	config_load atlas
	config_get_bool log_stderr "common" log_stderr "0"
	config_get_bool log_stdout "common" log_stdout "0"
	config_get_bool rxtxrpt "common" rxtxrpt "1"
	test_setting=$(grep "^[ 	]*RXTXRPT=yes" "$STATE_CONFIG")

	# Decide if we should write to permanent storage
	if [ "$rxtxrpt" == "1" ] &&  [ -z "$test_setting" ]; then
		echo "RXTXRPT=yes">$STATE_CONFIG
	elif [ "$rxtxrpt" == "0" ] &&  [ ! -z "$test_setting" ]; then
		echo "RXTXRPT=no">$STATE_CONFIG
	fi

	procd_open_instance
	procd_set_param command "$SCRIPTS_DIR/bin/ATLAS"
	procd_set_param stdout "$log_stdout"
	procd_set_param stderr "$log_stderr"
	procd_close_instance
}