#!/bin/sh
#    Copyright © 2011 Pau Escrich
#    Contributors Jo-Philipp Wich <xm@subsignal.org>
#		 Roger Pueyo Centelles <roger.pueyo@guifi.net>
#
#    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, write to the Free Software Foundation, Inc.,
#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#    The full GNU General Public License is included in this distribution in
#    the file called "COPYING".
#
#    This script gives information about bmx7
#    Can be executed from a Linux shell: ./bmx7-info -s links
#    Or from web interface (with cgi enabled): http://host/cgi-bin/bmx7-info?links
#    If you ask for a directory you will get the directory contents in JSON format

BMX7_DIR="$(uci get bmx7.general.runtimeDir 2>/dev/null)" || BMX7_DIR="/var/run/bmx7/json"

case "${1:-}" in
	-s)
		QUERY="$2"
		;;
	*)
		QUERY="${QUERY_STRING%%&*}"
		QUERY="${QUERY%%=*}"
		printf 'Content-type: application/json\n\n'
		;;
esac

check_path() {
	target="$1"

	# Resolve real absolute path safely
	resolved="$(cd "$(dirname -- "$target")" 2>/dev/null && pwd -P)/$(basename -- "$target")"

	[ -e "$resolved" ] || return
}
print_mem() {
	pid="$(pidof bmx7 2>/dev/null)" || return
	[ -r "/proc/$pid/status" ] || return

	vm=$(awk '/VmSize:/ {print $2" "$3}' "/proc/$pid/status")

	printf '{ "memory": { "bmx7": "%s" }}' "$vm"
}

print_query() {
	# If the query is a directory
	[ -d "$BMX7_DIR/$1" ] &&
	{
	# If /all has not been specified
		if [ -z "$QALL" ]; then
		first=1
		printf '{ "%s": [ ' "$1"
		for f in "$BMX7_DIR"/$1; do
			[ -e "$f" ] || continue
			printf '{ "name": "%s" }' "$(tr -d '\n' < "$f")"
			[ $first -eq 0 ] && printf ','
			first=0
		done
		printf " ] }"

	# If /all has been specified, print all the files together
		else
		first=1
		printf "[ "
		for entry in "$BMX7_DIR"/$1; do
			[ -f "$entry" ] &&
			{
				[ $first -eq 0 ] && printf ','
				printf "%s" "$(tr -d '\n' < "$entry")"
				first=0
			}
		done
		printf " ]"
		fi
	}

	# If the query is a file, just print the file
	[ -f "$BMX7_DIR/$1" ] && [ -s "$BMX7_DIR/$1" ] && cat "$BMX7_DIR/$1" && return 0 || return 1
}

if [ "${QUERY##*/}" = "all" ]; then
	QUERY="${QUERY%/all}"
	QALL=1
fi

case "$QUERY" in
	neighbours)
		QALL=1
		printf '{ "neighbours": [ '
		printf '{ "originators": '
		print_query originators
		printf '}, '
		printf '{ "descriptions": '
		print_query descriptions
		printf "} ] }"
		exit 0
		;;
	tunnels)
		bmx7 -c --jshow tunnels /r=0
		exit 0
		;;
	originators)
		bmx7 -c --jshow originators /r=0
		exit 0
		;;
	info)
		printf '{ "info": [ '
		print_query status && printf "," || printf '{ "status": "" },'
		print_query interfaces && printf "," || printf '{ "interfaces": "" },'
		print_query links && printf "," || printf '{ "links": "" },'
		print_mem
		printf "] }"
		;;
	*)
		check_path "$BMX7_DIR/$QUERY"
		print_query "$QUERY"
		;;
esac

exit 0