# mv /system/bin/dnsmasq /system/bin/dnsmasq.bin

#!/system/bin/sh

OLD_SUBNET='192.168.43'
NEW_SUBNET='192.168.1'
WIFI_INTERFACE='wlan0'
LOCAL_TABLE='97'

export PATH=/system/bin

# delete old route, add new
ip route del ${OLD_SUBNET}.0/24 dev ${WIFI_INTERFACE} table $LOCAL_TABLE
ip route add ${NEW_SUBNET}.0/24 dev ${WIFI_INTERFACE} table $LOCAL_TABLE

# set new IP address on Wi-Fi interface
ip address add ${NEW_SUBNET}.1/24 dev $WIFI_INTERFACE

# inject new subnet in hard-coded arguments received from netd
set -- $(printf '%s' "$*" | sed 's/'${OLD_SUBNET}'/'${NEW_SUBNET}'/g')
unset OLD_SUBNET NEW_SUBNET

# execute original binary with new arguments
exec dnsmasq.bin $*

~# RULES="$(ip rule | grep -vE 'unreachable|local')"
~# echo "$RULES"
~# for t in $(echo "$RULES" | awk '{print $NF}' | uniq); do ip r s table $t; done

# execute binaries from /system/bin
allow netd system_file dir { read open getattr search }
allow netd system_file file { read gettattr open execute execute_no_trans }

# execute /system/bin/sh
allow netd shell_exec file { read getattr open execute execute_no_trans }

# execute /system/bin/toolbox and its applets
allow netd toolbox_exec file { read gettattr open execute execute_no_trans }

# configure RPDB rules / routing tables
allow netd netd capability { sys_admin }

~# chown 0.0 /system/bin/dnsmasq*
~# chmod 0755 /system/bin/dnsmasq*
~# chcon u:object_r:dnsmasq_exec:s0 /system/bin/dnsmasq*