#!/bin/sh
. /usr/share/openclash/log.sh

CLASH="/etc/openclash/clash"
CLASH_CONFIG="/etc/openclash"
LOG_FILE="/tmp/openclash.log"
PROXY_FWMARK="0x162"
PROXY_ROUTE_TABLE="0x162"
enable_redirect_dns=$(uci -q get openclash.config.enable_redirect_dns)
dns_port=$(uci -q get openclash.config.dns_port)
disable_masq_cache=$(uci -q get openclash.config.disable_masq_cache)
cfg_update_interval=$(uci -q get openclash.config.config_update_interval || echo 60)
log_size=$(uci -q get openclash.config.log_size || echo 1024)
core_type=$(uci -q get openclash.config.core_type)
netflix_domains_prefetch_interval=$(uci -q get openclash.config.netflix_domains_prefetch_interval || echo 1440)
NETFLIX_DOMAINS_LIST="/usr/share/openclash/res/Netflix_Domains.list"
NETFLIX_DOMAINS_CUSTOM_LIST="/etc/openclash/custom/openclash_custom_netflix_domains.list"
_koolshare=$(cat /usr/lib/os-release 2>/dev/null |grep OPENWRT_RELEASE 2>/dev/null |grep -i koolshare 2>/dev/null)
CRASH_NUM=0
CFG_UPDATE_INT=1
NETFLIX_DOMAINS_PREFETCH=1
sleep 60

while :;
do
   cfg_update=$(uci -q get openclash.config.auto_update)
   cfg_update_mode=$(uci -q get openclash.config.config_auto_update_mode)
   cfg_update_interval_now=$(uci -q get openclash.config.config_update_interval || echo 60)
   netflix_domains_prefetch=$(uci -q get openclash.config.netflix_domains_prefetch || echo 0)
   netflix_domains_prefetch_interval_now=$(uci -q get openclash.config.netflix_domains_prefetch_interval || echo 1440)
   enable=$(uci -q get openclash.config.enable)

if [ "$enable" -eq 1 ]; then
	clash_pids=$(pidof clash |sed 's/$//g' |wc -l)
	if [ "$clash_pids" -gt 1 ]; then
		 LOG_OUT "Watchdog: Multiple Clash Processes, Kill All..."
		 for clash_pid in $clash_pids; do
	      kill -9 "$clash_pid" 2>/dev/null
		 done >/dev/null 2>&1
		 sleep 1
	fi 2>/dev/null
	if ! pidof clash >/dev/null; then
	   CRASH_NUM=$(expr "$CRASH_NUM" + 1)
	   if [ "$CRASH_NUM" -le 3 ]; then
	      RAW_CONFIG_FILE=$(uci -q get openclash.config.config_path)
	      CONFIG_FILE="/etc/openclash/$(uci -q get openclash.config.config_path |awk -F '/' '{print $5}' 2>/dev/null)"
	      LOG_OUT "Watchdog: Clash Core Problem, Restart..."
	      if [ -z "$_koolshare" ]; then
	         touch /tmp/openclash.log 2>/dev/null
           chmod o+w /etc/openclash/proxy_provider/* 2>/dev/null
           chmod o+w /etc/openclash/rule_provider/* 2>/dev/null
           chmod o+w /tmp/openclash.log 2>/dev/null
           chown nobody:nogroup /etc/openclash/core/* 2>/dev/null
           capabilties="cap_sys_resource,cap_dac_override,cap_net_raw,cap_net_bind_service,cap_net_admin"
           capsh --caps="${capabilties}+eip" -- -c "capsh --user=nobody --addamb='${capabilties}' -- -c 'nohup $CLASH -d $CLASH_CONFIG -f \"$CONFIG_FILE\" >> $LOG_FILE 2>&1 &'" >> $LOG_FILE 2>&1
        else
           nohup $CLASH -d $CLASH_CONFIG -f "$CONFIG_FILE" >> $LOG_FILE 2>&1 &
        fi
	      sleep 3
	      if [ "$core_type" = "TUN" ]; then
	         ip route replace default dev utun table "$PROXY_ROUTE_TABLE" 2>/dev/null
	         ip rule add fwmark "$PROXY_FWMARK" table "$PROXY_ROUTE_TABLE" 2>/dev/null
	      elif [ "$core_type" = "Game" ]; then
	         ip tuntap add user root mode tun clash0 2>/dev/null
           ip link set clash0 up 2>/dev/null
           ip route replace default dev clash0 table "$PROXY_ROUTE_TABLE" 2>/dev/null
           ip rule add fwmark "$PROXY_FWMARK" table "$PROXY_ROUTE_TABLE" 2>/dev/null
	      fi
	   else
	      LOG_OUT "Watchdog: Already Restart 3 Times With Clash Core Problem, Auto-Exit..."
	      /etc/init.d/openclash stop
	      exit 0
	   fi
	else
	   CRASH_NUM=0
  fi
fi

## Porxy history
    /usr/share/openclash/openclash_history_get.sh

## Log File Size Manage:
    LOGSIZE=`ls -l /tmp/openclash.log |awk '{print int($5/1024)}'`
    if [ "$LOGSIZE" -gt "$log_size" ]; then
       : > /tmp/openclash.log
       LOG_OUT "Watchdog: Log Size Limit, Clean Up All Log Records..."
    fi

## 端口转发重启
   last_line=$(iptables -t nat -nL PREROUTING --line-number |awk '{print $1}' 2>/dev/null |awk 'END {print}' |sed -n '$p')
   op_line=$(iptables -t nat -nL PREROUTING --line-number |grep "openclash" 2>/dev/null |awk '{print $1}' 2>/dev/null |head -1)
   if [ "$last_line" != "$op_line" ] && [ -n "$op_line" ]; then
      pre_lines=$(iptables -nvL PREROUTING -t nat |sed 1,2d |sed -n '/openclash/=' 2>/dev/null |sort -rn)
      for pre_line in $pre_lines; do
         iptables -t nat -D PREROUTING "$pre_line" >/dev/null 2>&1
      done >/dev/null 2>&1
      iptables -t nat -A PREROUTING -p tcp -j openclash
      LOG_OUT "Watchdog: Reset Firewall For Enabling Redirect..."
   fi
   
## DNS转发劫持
   if [ "$enable_redirect_dns" -ne 0 ]; then
      if [ -z "$(uci -q get dhcp.@dnsmasq[0].server |grep "$dns_port")" ] || [ ! -z "$(uci -q get dhcp.@dnsmasq[0].server |awk -F ' ' '{print $2}')" ]; then
         LOG_OUT "Watchdog: Force Reset DNS Hijack..."
         uci -q del dhcp.@dnsmasq[-1].server
         uci -q add_list dhcp.@dnsmasq[0].server=127.0.0.1#"$dns_port"
         uci -q delete dhcp.@dnsmasq[0].resolvfile
         uci -q set dhcp.@dnsmasq[0].noresolv=1
         [ "$disable_masq_cache" -eq 1 ] && {
         	uci -q set dhcp.@dnsmasq[0].cachesize=0
         }
         uci -q commit dhcp
         /etc/init.d/dnsmasq restart >/dev/null 2>&1
      fi
   fi

## 配置文件循环更新
   if [ "$cfg_update" -eq 1 ] && [ "$cfg_update_mode" -eq 1 ]; then
      [ "$cfg_update_interval" -ne "$cfg_update_interval_now" ] && CFG_UPDATE_INT=0 && cfg_update_interval="$cfg_update_interval_now"
      if [ "$CFG_UPDATE_INT" -ne 0 ]; then
         [ "$(expr "$CFG_UPDATE_INT" % "$cfg_update_interval_now")" -eq 0 ] && /usr/share/openclash/openclash.sh
      fi
      CFG_UPDATE_INT=$(expr "$CFG_UPDATE_INT" + 1)
   fi

##Dler Cloud Checkin
   /usr/share/openclash/openclash_dler_checkin.lua >/dev/null 2>&1
   
##NETFLIX_DNS_PREFETCH
   if [ "$netflix_domains_prefetch" -eq 1 ]; then
      [ "$netflix_domains_prefetch_interval" -ne "$netflix_domains_prefetch_interval_now" ] && NETFLIX_DOMAINS_PREFETCH=1 && netflix_domains_prefetch_interval="$netflix_domains_prefetch_interval_now"
      if [ "$NETFLIX_DOMAINS_PREFETCH" -ne 0 ]; then
         if [ "$(expr "$NETFLIX_DOMAINS_PREFETCH" % "$netflix_domains_prefetch_interval_now")" -eq 0 ] || [ "$NETFLIX_DOMAINS_PREFETCH" -eq 1 ]; then
            LOG_OUT "Tip: Start Prefetch Netflix Domains..."
            cat "$NETFLIX_DOMAINS_LIST" |while read -r line
            do
               [ -n "$line" ] && nslookup $line
            done >/dev/null 2>&1
            cat "$NETFLIX_DOMAINS_CUSTOM_LIST" |while read -r line
            do
               [ -n "$line" ] && nslookup $line
            done >/dev/null 2>&1
            LOG_OUT "Tip: Netflix Domains Prefetch Finished..."
         fi
      fi
      NETFLIX_DOMAINS_PREFETCH=$(expr "$NETFLIX_DOMAINS_PREFETCH" + 1)
   fi

   SLOG_CLEAN
   sleep 60
done 2>/dev/null
