Bash/Port/Forward
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Forward Script
#!/bin/bash
: '
@author "Chorke Academia"<devs.academia@chorke.org>
@web http://chorke.org/academia
@vendor Chorke Academia, Inc.
@version 1.0.00.GA
@since 1.0.00.GA
'
# pre initialized data for iptables port forwarding
CKI_ALL_PORT='22210 22211 22212 22213 22214 22215'
CKI_ALL_ADDR='100.83.0.20 100.83.0.21 100.83.0.22'
CKI_ALL_ADDR="$CKI_ALL_ADDR 100.83.0.23"
CKI_ALL_ADDR="$CKI_ALL_ADDR 100.83.0.24"
CKI_ALL_ADDR="$CKI_ALL_ADDR 100.83.0.25"
CKI_WAN_ADDR=139.59.51.80
# set source port
choose_wan_port(){
printf "\n\033[0;33mchoose wan port:\033[0m\n";
select CKI_WAN_PORT in '22200' '22299';do
case $CKI_WAN_PORT in
'22200') break;;
'22299') break;;
esac
done
}
# set target port
choose_lan_port(){
printf "\n\033[0;33mchoose lan port:\033[0m\n";
select CKI_LAN_PORT in $CKI_ALL_PORT;do
case $CKI_LAN_PORT in
'22210') break;;
'22211') break;;
'22212') break;;
'22213') break;;
'22214') break;;
'22215') break;;
esac
done
}
# set target addrress/ip
choose_lan_addr(){
printf "\n\033[0;33mchoose lan addr:\033[0m\n";
select CKI_LAN_ADDR in $CKI_ALL_ADDR;do
case $CKI_LAN_ADDR in
'100.83.0.20') break;;
'100.83.0.21') break;;
'100.83.0.22') break;;
'100.83.0.23') break;;
'100.83.0.24') break;;
'100.83.0.25') break;;
esac
done
}
# set action/operation
choose_action(){
printf "\n\033[0;33mchoose operation:\033[0m\n";
select CKI_ACTION in 'add' 'del';do
case $CKI_ACTION in
'add') break;;
'del') break;;
esac
done
printf '\n\033[0;33mconfirm operation:\033[0m\n';
CKI_MESSAGE='\033[0;31m%s\033[0m \033[0;33m%s:%s';
CKI_MESSAGE="$CKI_MESSAGE\033[0m => \033[0;33m%s:%s\033[0m\n";
printf "$CKI_MESSAGE" "$CKI_ACTION" "$CKI_WAN_ADDR" "$CKI_WAN_PORT" "$CKI_LAN_ADDR" "$CKI_LAN_PORT";
select CKI_CONFIRM in 'yes' 'no';do
case $CKI_CONFIRM in
'yes') break;;
'no') break;;
esac
done
}
# add rules to iptables
operation_add(){
iptables -t nat -A PREROUTING -p tcp -m tcp -d $CKI_WAN_ADDR --dport $CKI_WAN_PORT -j DNAT --to-destination $CKI_LAN_ADDR:$CKI_LAN_PORT
iptables -A FORWARD -m state -p tcp -d $CKI_LAN_ADDR --dport $CKI_LAN_PORT --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -p tcp -m tcp -s $CKI_LAN_ADDR --sport $CKI_LAN_PORT -j SNAT --to-source $CKI_WAN_ADDR
printf '\n\033[0;32msuccess operation:\033[0m\n';
printf "$CKI_MESSAGE\n" "$CKI_ACTION" "$CKI_WAN_ADDR" "$CKI_WAN_PORT" "$CKI_LAN_ADDR" "$CKI_LAN_PORT";
}
# delete from iptables
operation_del(){
iptables -t nat -D PREROUTING -p tcp -m tcp -d $CKI_WAN_ADDR --dport $CKI_WAN_PORT -j DNAT --to-destination $CKI_LAN_ADDR:$CKI_LAN_PORT
iptables -D FORWARD -m state -p tcp -d $CKI_LAN_ADDR --dport $CKI_LAN_PORT --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -D POSTROUTING -p tcp -m tcp -s $CKI_LAN_ADDR --sport $CKI_LAN_PORT -j SNAT --to-source $CKI_WAN_ADDR
printf '\n\033[0;32msuccess operation:\033[0m\n';
printf "$CKI_MESSAGE\n" "$CKI_ACTION" "$CKI_WAN_ADDR" "$CKI_WAN_PORT" "$CKI_LAN_ADDR" "$CKI_LAN_PORT";
}
# execute options
choose_wan_port &&
choose_lan_port &&
choose_lan_addr &&
choose_action;
# exectue action
if [ "$CKI_CONFIRM" == 'yes' ];then
if [ "$CKI_ACTION" == 'add' ];then operation_add;
elif [ "$CKI_ACTION" == 'del' ];then operation_del;fi
else
printf '\n\033[0;31mcanceled operation:\033[0m\n';
printf "$CKI_MESSAGE\n" "$CKI_ACTION" "$CKI_WAN_ADDR" "$CKI_WAN_PORT" "$CKI_LAN_ADDR" "$CKI_LAN_PORT";
fi
# safe exit
exit $?
Good to Know
# enable series of port
firewall-cmd --zone=public --permanent --add-port=22200-22299/tcp
# enable specific port
firewall-cmd --zone=public --permanent --add-port=22200/tcp
# check port 22200
fuser 22200/tcp
# wan & lan ip config
CKI_WAN_ADDR=139.59.51.80
CKI_LAN_ADDR=100.43.0.20
# wan & lan port config
CKI_WAN_PORT=22200
CKI_LAN_PORT=22211
# add forwarding rule
iptables -t nat -A PREROUTING -p tcp -m tcp -d $CKI_WAN_ADDR --dport $CKI_WAN_PORT -j DNAT --to-destination $CKI_LAN_ADDR:$CKI_LAN_PORT
iptables -A FORWARD -m state -p tcp -d $CKI_LAN_ADDR --dport $CKI_LAN_PORT --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -p tcp -m tcp -s $CKI_LAN_ADDR --sport $CKI_LAN_PORT -j SNAT --to-source $CKI_WAN_ADDR
# remove forwarding rule
iptables -t nat -D PREROUTING -p tcp -m tcp -d $CKI_WAN_ADDR --dport $CKI_WAN_PORT -j DNAT --to-destination $CKI_LAN_ADDR:$CKI_LAN_PORT
iptables -D FORWARD -m state -p tcp -d $CKI_LAN_ADDR --dport $CKI_LAN_PORT --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -D POSTROUTING -p tcp -m tcp -s $CKI_LAN_ADDR --sport $CKI_LAN_PORT -j SNAT --to-source $CKI_WAN_ADDR