#!/bin/sh
# Copyright (C) 2019 iopsys Software Solutions AB
# 	Author: IMEN Bhiri <imen.bhiri@pivasoftware.com>
# 	Author: AMIN Ben Ramdhane <amin.benramdhane@pivasoftware.com>


UCI_CONFIG_DIR="/etc/config/"
UCI_GET_VARSTATE="/sbin/uci -q ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} -P /var/state get"
UCI_SET_VARSTATE="/sbin/uci -q ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} -P /var/state set"
UCI_ADD_VARSTATE="/sbin/uci -q ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} -P /var/state add"
UCI_DELETE_VARSTATE="/sbin/uci -q ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} -P /var/state delete"
CAPTURE_FILE="/tmp/download_dump"
DOWNLOAD_DIAGNOSTIC_FILE="/tmp/bbfdm_download_diagnostic"
DOWNLOAD_DIAGNOSTIC_LOG_FILE="/tmp/bbfdm_download_diagnostic_log"
CONNECTION_TIMEOUT=10

download_get() {
	local val=`$UCI_GET_VARSTATE $1`
	echo ${val:-$2}
}

download_launch() {
	local tx_bytes_before rx_bytes_before time1 tx_bytes_after rx_bytes_after time2 res rh ba stc periodtime
	local url=$2
	local interface=$3
	[ "$1" == "cwmp" ] && [ "`$UCI_GET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState`" != "Requested" ] && return
	[ "$url" = "" ] && { $UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=Error_InitConnectionFailed; return; }
	local proto=`download_get cwmp.@downloaddiagnostic[0].ProtocolVersion Any`
	# Disable acceleration on Broadcom devices to capture all packets with tcpdump
	[ -e /usr/sbin/fcctl ] && { fcctl disable >/dev/null 2>&1; fcctl flush >/dev/null 2>&1; }
	tcpdump -i $interface tcp -w ${CAPTURE_FILE} > /dev/null 2>&1 &
	PID=$!
	sleep 1
	if [ ${url:0:7} = http:// -o ${url:0:6} = ftp:// ]; then
		tx_bytes_before=`ubus call network.device status "{'name':'$interface'}" | jsonfilter -e @.statistics.tx_bytes`
		rx_bytes_before=`ubus call network.device status "{'name':'$interface'}" | jsonfilter -e @.statistics.rx_bytes`
		time1=`date +%s`
		[ "$proto" = "Any" ] && res=$(wget -t 1 --timeout=${CONNECTION_TIMEOUT} -O ${DOWNLOAD_DIAGNOSTIC_FILE} -o ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} $url 2>&1)
		[ "$proto" = "IPv4" ] && res=$(wget -4 -t 1 --timeout=${CONNECTION_TIMEOUT} -O ${DOWNLOAD_DIAGNOSTIC_FILE} -o ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} $url 2>&1)
		[ "$proto" = "IPv6" ] && res=$(wget -6 -t 1 --timeout=${CONNECTION_TIMEOUT} -O ${DOWNLOAD_DIAGNOSTIC_FILE} -o ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} $url 2>&1)
		time2=`date +%s`
		tx_bytes_after=`ubus call network.device status "{'name':'$interface'}" | jsonfilter -e @.statistics.tx_bytes`
		rx_bytes_after=`ubus call network.device status "{'name':'$interface'}" | jsonfilter -e @.statistics.rx_bytes`
		rh=`cat ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} | grep "resolve host"`
		[ -n "$ba" ] && { $UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=Error_CannotResolveHostName; kill $PID 2> /dev/null; return; }
		ba=`echo "$res" | grep "bad address"`
		[ -n "$ba" ] && { $UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=Error_InitConnectionFailed; kill $PID 2> /dev/null; return; }
		stc=`cat ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} | grep "404 Not Found"`
		[ -n "$stc" ] && { $UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=Error_NoResponse; kill $PID 2> /dev/null; return; }
		stc=`cat ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} | grep "100%"`
		[ -z "$stc" ] && { $UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=Error_TransferFailed; kill $PID 2> /dev/null; return; }
	fi
	tx_bytes=$((tx_bytes_after-tx_bytes_before))
	rx_bytes=$((rx_bytes_after-rx_bytes_before))
	periodtime=$(($((time2-time1))*1000000))
	$UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=Completed
	$UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].TotalBytesReceived=$rx_bytes
	$UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].TotalBytesSent=$tx_bytes
	$UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].PeriodOfFullLoading=$periodtime
	local perconnection=`$UCI_GET_VARSTATE cwmp.@downloaddiagnostic[0].EnablePerConnection`
	if ([ "$perconnection" == "true" ] || [ "$perconnection" == "1" ]); then
		$UCI_ADD_VARSTATE cwmp DownloadPerConnection
		$UCI_SET_VARSTATE cwmp.@DownloadPerConnection[0].TotalBytesReceived=$rx_bytes
		$UCI_SET_VARSTATE cwmp.@DownloadPerConnection[0].TotalBytesSent=$tx_bytes
	else
		$UCI_DELETE_VARSTATE cwmp.@DownloadPerConnection[0]
	fi
	rm ${DOWNLOAD_DIAGNOSTIC_FILE} 2>/dev/null
	rm ${DOWNLOAD_DIAGNOSTIC_LOG_FILE} 2>/dev/null
	sleep 1
	local pids=`ps | grep $PID`
	kill $PID &>/dev/null
	# Enable acceleration on Broadcom devices after killing the tcpdump pid 
	[ -e /usr/sbin/fcctl ] && { fcctl enable >/dev/null 2>&1; fcctl flush >/dev/null 2>&1; }
}

download_stop_diagnostic() {
	$UCI_DELETE_VARSTATE cwmp.@DownloadPerConnection[0]
	local pids=`ps | grep download_launch.*run | grep -v grep | awk '{print $1}'`
	if [ -n "$pids" ]; then
		kill -9 $pids &>/dev/null
		$UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=None
	fi
	local pids=`ps | grep download_launch.*run | grep -v grep | awk '{print $1}'`                               
    if [ -n "$pids" ]; then
    	kids=$(grep -l "PPid.*$pids" /proc/*/task/*/status | grep -o "[0-9]*")                    
		for kid in $kids; do                                                  
	    	kill -9 $kid &>/dev/null                                                   
	    done
	    kill -9 $pids &>/dev/null                                                               
	    $UCI_SET_VARSTATE cwmp.@downloaddiagnostic[0].DiagnosticState=None      
    fi 
}

if [ "$1" == "run" ] ; then
	download_launch $2 $3 $4
elif [ "$1" == "stop" ]; then
	download_stop_diagnostic
else
	return
fi