DVA-5592 autostart script

!README.md

root@dlinkrouter:~# cp /tmp/smx.sh /etc/init.d/smx.sh
root@dlinkrouter:~# cd /etc/rc.d
root@dlinkrouter:/etc/rc.d# ln -s ../init.d/smx.sh S50smx.sh

init.sh

#!/bin/sh
dnat_tcp(){
        iptables -I SmxIn -p tcp -m tcp --dport $1 -j ACCEPT
        iptables -t nat -I PREROUTING -p tcp -m tcp ! -s 192.168.0.0/23 --dport $1 -j DNAT --to=$2
}
dnat_udp(){
        iptables -I SmxIn -p udp -m udp --dport $1 -j ACCEPT
        iptables -t nat -I PREROUTING -p udp -m udp ! -s 192.168.0.0/23 --dport $1 -j DNAT --to=$2
}
mount_ifnot(){
        local src="$1"
        local dst="$2"
        local opts="$3"

        grep -q "$dst" /proc/mounts || (
                echo "mounting $dst ..."
                mount $opts "$src" "$dst"
        )
}
init_chroot(){
        mount_ifnot /dev $root/dev "-o bind"
        mount_ifnot devpts $root/dev/pts "-t devpts"
        mount_ifnot proc $root/proc "-t proc"
        mount_ifnot sysfs $root/sys "-t sysfs"

        #mount_ifnot /tmp $root/yaps-tmp "-o bind"
}
fake_fwver(){
        cmclient SET Device.DeviceInfo.SoftwareVersion DVA-5592_A1_WI_20180823
}

setup_firewall(){
        ## Short circuit INPUT
        iptables -P INPUT DROP
        iptables -I INPUT -j DROP

        iptables -N SmxIn
        iptables -I INPUT -j SmxIn

        ## Allowance
        iptables -A SmxIn -i lo -j ACCEPT
        iptables -A SmxIn -m state --state RELATED,ESTABLISHED -j ACCEPT
        #iptables -A SmxIn -m iprange --dst-range 224.0.0.0-239.255.255.255 -j ACCEPT
        iptables -A SmxIn -s 127.0.0.1/8 ! -i lo -j DROP
        iptables -A SmxIn -i br0 -j ACCEPT
        
        # DLink Voip Stack
        iptables -A SmxIn -p udp -m udp --dport 5060 -j ACCEPT
        # Asterisk
        iptables -A SmxIn -p udp -m udp --dport 5062 -j ACCEPT
        # Asterisk RTP
        iptables -A SmxIn -p udp -m udp --dport 10000:10100 -j ACCEPT

        # StrongSwan forwarding
        iptables -A SmxIn -p esp -j ACCEPT
}

export TERM=linux
root=$PWD
init_chroot
fake_fwver
setup_firewall
# continue without blocking boot
nohup ./init_post.sh &>/dev/null 2>&1 &

init_local.sh

#!/bin/sh
/usr/sbin/sshd -f /etc/ssh/sshd_config

init_post.sh

#!/bin/sh
ROOT=$PWD
export LD_LIBRARY_PATH="${ROOT}/lib:${ROOT}/usr/lib"

wait_xdsl_link(){
        while true; do
                local status=`xdslctl info --state | grep ^Status: | cut -d ' ' -f2`
                if [ "$status" == "Showtime" ]; then
                        break
                fi
                sleep 2
        done
}

run_ddns_monitor(){
        cd "${ROOT}/ipchange"
        nohup ./monitor &>/dev/null 2>&1 &
}

# a bug in cm resets the EWAN port status to disabled on each reboot
# since i use it as a normal ethernet port, it must be manually re-enabled
enable_eth5(){
        cmclient SET Device.Ethernet.Interface.5.Enable true
}

sleep 5
chroot $ROOT /bin/sh -c '/init_local.sh'

wait_xdsl_link
run_ddns_monitor
sleep 20
enable_eth5

smx.sh

#!/bin/sh /etc/rc.common
START=50

init_chroot(){
        local root="$1"

        [ -f "$root/init.sh" ] && [ -x "$root/init.sh" ] && (
                echo "running init.sh on $root ..."
                cd $root
                sh init.sh
        )
}

mount_usbdevs(){
        for sysdev in `ls -1d /sys/block/sd*`; do
                # safety check
                [ ! -e "$sysdev/queue" ] && continue

                dev=$(basename "$sysdev")
                echo "probing $dev ..."
                for syspart in `ls -1d $sysdev/sd*`; do
                        # safety check
                        [ ! -e "$syspart/partition" ] && continue

                        part=$(basename "$syspart")

                        [ ! -d /mnt/$part ] && mkdir /mnt/$part
                        grep -q /mnt/$part /proc/mounts || (
                                echo "mounting $part ..."
                                mount /dev/$part /mnt/$part
                                [ -d /mnt/$part/yaps-rootfs ] && init_chroot /mnt/$part/yaps-rootfs
                        )
                done
        done
}

boot(){
        mount_usbdevs
}