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smartdns/package/optware/S50smartdns

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#!/bin/sh
#
# Copyright (C) 2018-2023 Ruilin Peng (Nick) <pymumu@gmail.com>.
#
# smartdns 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 3 of the License, or
# (at your option) any later version.
#
# smartdns 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, see <http://www.gnu.org/licenses/>.
SMARTDNS_BIN=/opt/usr/sbin/smartdns
SMARTDNS_CONF=/opt/etc/smartdns/smartdns.conf
DNSMASQ_CONF="/etc/dnsmasq.conf /var/etc/dnsmasq.conf /etc/storage/dnsmasq/dnsmasq.conf"
SMARTDNS_PID=/run/smartdns.pid
if [ ! -d "/run" ]; then
SMARTDNS_PID=/var/run/smartdns.pid
fi
SMARTDNS_PORT=535
SMARTDNS_OPT=/opt/etc/smartdns/smartdns-opt.conf
# workmode
# DO NOT CHANGE THIS, CHANGE MODE IN smartdns-opt.conf
# 0: run as port only
# 1: redirect port
# 2: replace
SMARTDNS_WORKMODE="1"
if [ -f "$SMARTDNS_OPT" ]; then
. "$SMARTDNS_OPT"
fi
set_iptable()
{
local redirect_tcp
redirect_tcp=0
grep ^bind-tcp $SMARTDNS_CONF > /dev/null 2>&1
if [ $? -eq 0 ]; then
redirect_tcp=1;
fi
IPS="$(ifconfig | grep "inet addr" | grep -v ":127" | grep "Bcast" | awk '{print $2}' | awk -F: '{print $2}')"
for IP in $IPS
do
if [ $redirect_tcp -eq 1 ]; then
iptables -t nat -A PREROUTING -p tcp -d "$IP" --dport 53 -j REDIRECT --to-ports "$SMARTDNS_PORT" > /dev/null 2>&1
fi
iptables -t nat -A PREROUTING -p udp -d "$IP" --dport 53 -j REDIRECT --to-ports "$SMARTDNS_PORT" > /dev/null 2>&1
done
}
clear_iptable()
{
IPS="$(ifconfig | grep "inet addr" | grep -v ":127" | grep "Bcast" | awk '{print $2}' | awk -F: '{print $2}')"
for IP in $IPS
do
iptables -t nat -D PREROUTING -p tcp -d "$IP" --dport 53 -j REDIRECT --to-ports "$SMARTDNS_PORT" > /dev/null 2>&1
iptables -t nat -D PREROUTING -p udp -d "$IP" --dport 53 -j REDIRECT --to-ports "$SMARTDNS_PORT" > /dev/null 2>&1
done
}
get_dnsmasq_cmd()
{
CMD="$(ps 2>/dev/null | grep -e '[a-zA-Z]\{0,2\} \{1,\}dnsmasq' | grep -v grep 2>/dev/null)"
if [ ! -z "$CMD" ]; then
return
fi
CMD="$(ps 2>/dev/null | grep '/usr/sbin/dnsmasq' | grep -v grep 2>/dev/null)"
if [ ! -z "$CMD" ]; then
return
fi
CMD="$(ps 2>/dev/null | grep 'dnsmasq' | grep -v grep 2>/dev/null)"
if [ ! -z "$CMD" ]; then
return
fi
CMD="$(ps ax 2>/dev/null | grep -e '[a-zA-Z]\{0,2\} \{1,\}dnsmasq' | grep -v grep 2>/dev/null)"
if [ ! -z "$CMD" ]; then
return
fi
CMD="$(ps ax 2>/dev/null | grep /usr/sbin/dnsmasq | grep -v grep 2>/dev/null)"
if [ ! -z "$CMD" ]; then
return
fi
CMD="$(ps ax 2>/dev/null | grep 'dnsmasq' | grep -v grep 2>/dev/null)"
if [ ! -z "$CMD" ]; then
return
fi
}
restart_dnsmasq()
{
local CMD=""
get_dnsmasq_cmd
if [ -z "$CMD" ]; then
echo "cannot find dnsmasq"
return 1
fi
# check multiple dnsmasq
linecount="$(echo "$CMD" | wc -l)"
if [ $linecount -eq 1 ]; then
PID="$(echo "$CMD" | awk '{print $1}')"
elif [ $linecount -gt 1 ]; then
PID1="$(echo "$CMD" | awk 'NR==1{print $1}')"
PID2="$(echo "$CMD" | awk 'NR==2{print $1}')"
PID2_PPID="$(grep 'PPid:' /proc/$PID2/status | awk '{print $2}' 2>/dev/null)"
if [ "$PID2_PPID" != "$PID1" ]; then
echo "find multiple dnsmasq, but not started by the same process"
return 1
fi
PID=$PID1
else
echo "find multiple dnsmasq, but not started by the same process"
return 1
fi
if [ ! -d "/proc/$PID" ]; then
echo "dnsmasq is not running"
return 1
fi
kill -9 "$PID"
# get dnsmasq command
CMD="$(echo "$CMD" | head -n 1)"
DNSMASQ_CMD="$(echo "$CMD" | awk '{for(i=5; i<=NF;i++)printf $i " "}')"
$DNSMASQ_CMD
}
add_dhcp_options6()
{
CONF_FILE=$1
IPS="$(ifconfig | grep "inet addr" | grep -v ":127" | grep "Bcast" | awk '{print $2}' | awk -F: '{print $2}')"
for IP in $IPS
do
DHCP_OPTION="$(grep "dhcp-option=" "$CONF_FILE" | grep "$IP" | head -n 1)"
if [ -z "$DHCP_OPTION" ]; then
continue
fi
SERVER_TAG="$(echo "$DHCP_OPTION" | awk -F= '{print $2}' | awk -F, '{print $1}')"
LOCAL_SERVER_IP="$IP"
grep "dhcp-option *= *$SERVER_TAG, *6 *, *$LOCAL_SERVER_IP" "$CONF_FILE" 1>/dev/null 2>&1
if [ $? -eq 0 ]; then
continue
fi
DHCP_OPTION="dhcp-option=$SERVER_TAG,6,$LOCAL_SERVER_IP"
echo "$DHCP_OPTION" >> "$CONF_FILE"
RESTART_DNSMASQ=1
done
return 1
}
clear_dhcp_options6()
{
CONF_FILE=$1
IPS="$(ifconfig | grep "inet addr" | grep -v ":127" | grep "Bcast" | awk '{print $2}' | awk -F: '{print $2}')"
for IP in $IPS
do
DHCP_OPTION="$(grep "dhcp-option=" "$CONF_FILE" | grep "$IP" | head -n 1)"
if [ -z "$DHCP_OPTION" ]; then
continue
fi
SERVER_TAG="$(echo "$DHCP_OPTION" | awk -F= '{print $2}' | awk -F, '{print $1}')"
LOCAL_SERVER_IP="$IP"
grep "dhcp-option *= *$SERVER_TAG, *6 *, *$LOCAL_SERVER_IP" "$CONF_FILE" 1>/dev/null 2>&1
if [ $? -ne 0 ]; then
continue
fi
sed -i "/^dhcp-option *=$SERVER_TAG,6,/d" "$CONF_FILE"
RESTART_DNSMASQ=1
done
return 1
}
set_dnsmasq_conf()
{
local LOCAL_SERVER_IP=""
local SERVER_TAG=""
local CONF_FILE=$1
local DHCP_OPTIONS=""
add_dhcp_options6 "$CONF_FILE"
grep "^port *=0" "$CONF_FILE" > /dev/null 2>&1
if [ $? -ne 0 ]; then
sed -i "/^port *=/d" "$CONF_FILE"
echo "port=0" >> "$CONF_FILE"
RESTART_DNSMASQ=1
fi
}
set_dnsmasq()
{
local RESTART_DNSMASQ=0
for conf in $DNSMASQ_CONF
do
if [ ! -e "$conf" ]; then
continue
fi
set_dnsmasq_conf "$conf"
done
if [ $RESTART_DNSMASQ -ne 0 ]; then
restart_dnsmasq
fi
}
clear_dnsmasq_conf()
{
local LOCAL_SERVER_IP=""
local SERVER_TAG=""
local CONF_FILE=$1
clear_dhcp_options6 "$CONF_FILE"
grep "^port *=" "$CONF_FILE" > /dev/null 2>&1
if [ $? -eq 0 ]; then
sed -i "/^port *=/d" "$CONF_FILE"
RESTART_DNSMASQ=1
fi
}
clear_dnsmasq()
{
local RESTART_DNSMASQ=0
for conf in $DNSMASQ_CONF
do
if [ ! -e "$conf" ]; then
continue
fi
clear_dnsmasq_conf "$conf"
done
if [ $RESTART_DNSMASQ -ne 0 ]; then
restart_dnsmasq
fi
}
set_smartdns_port()
{
if [ "$SMARTDNS_WORKMODE" = "0" ]; then
return 0
elif [ "$SMARTDNS_WORKMODE" = "1" ]; then
sed -i "s/^\(bind .*\):53\( .*\)\?$/\1:$SMARTDNS_PORT \2/g" $SMARTDNS_CONF
sed -i "s/^\(bind-tcp .*\):53\( .*\)\?$/\1:$SMARTDNS_PORT \2/g" $SMARTDNS_CONF
elif [ "$SMARTDNS_WORKMODE" = "2" ]; then
sed -i "s/^\(bind .*\):$SMARTDNS_PORT\( .*\)\?$/\1:53 \2/g" $SMARTDNS_CONF
sed -i "s/^\(bind-tcp .*\):$SMARTDNS_PORT\( .*\)\?$/\1:53 \2/g" $SMARTDNS_CONF
else
return 1
fi
return 0
}
set_rule()
{
if [ "$SMARTDNS_WORKMODE" = "0" ]; then
return 0
elif [ "$SMARTDNS_WORKMODE" = "1" ]; then
set_iptable
return $?
elif [ "$SMARTDNS_WORKMODE" = "2" ]; then
set_dnsmasq
return $?
else
return 1
fi
}
clear_rule()
{
if [ "$SMARTDNS_WORKMODE" = "0" ]; then
return 0
elif [ "$SMARTDNS_WORKMODE" = "1" ]; then
clear_iptable
return $?
elif [ "$SMARTDNS_WORKMODE" = "2" ]; then
clear_dnsmasq
return $?
else
return 1
fi
}
get_tz()
{
if [ -e "/etc/localtime" ]; then
return
fi
for tzfile in /etc/TZ /var/etc/TZ
do
if [ ! -e "$tzfile" ]; then
continue
fi
tz="$(cat $tzfile 2>/dev/null)"
done
if [ -z "$tz" ]; then
return
fi
export TZ=$tz
}
case "$1" in
start)
set_rule
if [ $? -ne 0 ]; then
exit 1
fi
set_smartdns_port
get_tz
$SMARTDNS_BIN -c "$SMARTDNS_CONF" -p $SMARTDNS_PID
if [ $? -ne 0 ]; then
clear_rule
exit 1
fi
;;
status)
pid="$(cat $SMARTDNS_PID |head -n 1 2>/dev/null)"
if [ -z "$pid" ]; then
echo "smartdns not running."
exit 0
fi
if [ -d "/proc/$pid" ]; then
echo "smartdns is running"
exit 0
fi
echo "smartdns not running."
exit 0
;;
stop)
pid="$(cat "$SMARTDNS_PID" | head -n 1 2>/dev/null)"
if [ -z "$pid" ]; then
echo "smartdns not running."
exit 0
fi
kill -15 "$pid" 2>/dev/null
SLEEP=$(which usleep 2>/dev/null)
SLEEPTIME=200000
if [ -z "$SLEEP" ]; then
SLEEP="sleep"
SLEEPTIME=0.2
fi
N=300
while [ $N -gt 0 ]
do
pid="$(cat "$SMARTDNS_PID" | head -n 1 2>/dev/null)"
if [ -z "$pid" ]; then
break
fi
if [ ! -d "/proc/$pid" ]; then
break
fi
stat="$(cat /proc/${pid}/stat | awk '{print $3}' 2>/dev/null)"
if [ "$stat" = "Z" ]; then
$SLEEP $SLEEPTIME
break
fi
$SLEEP $SLEEPTIME 2>/dev/null
N=$((N-1))
done
kill -9 "$pid" 2>/dev/null
clear_rule
exit 0
;;
restart)
$0 stop
$0 start
;;
reload)
;;
enable)
nvram set apps_state_enable=2
nvram set apps_state_error=0
nvram set apps_state_install=5
nvram set apps_state_action=install
nvram set apps_u2ec_ex=2
;;
firewall-start|reload|force-reload|reconfigure)
$0 restart
;;
*)
;;
esac