|
#!/bin/sh
|
|
|
|
# Replicant USB Networking
|
|
# ========================
|
|
#
|
|
# Copyright (C) 2011 Paul Kocialkowski, GPLv3+
|
|
#
|
|
# This program 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.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
IPTABLES_CLEAN_RULES=true
|
|
|
|
USB_IFACE="usb0"
|
|
INTERNET_IFACE="eth0"
|
|
|
|
USB_IFACE_IP="192.168.4.200"
|
|
|
|
# Clean iptables rules
|
|
|
|
iptables_rules_clean () {
|
|
if [ $IPTABLES_CLEAN_RULES = false ]
|
|
then
|
|
return
|
|
fi
|
|
|
|
iptables --flush
|
|
iptables --table nat --flush
|
|
iptables --delete-chain
|
|
iptables --table nat --delete-chain
|
|
}
|
|
|
|
# Inject iptables forwarding rules
|
|
|
|
iptables_forward_rules_apply () {
|
|
iptables --table nat --append POSTROUTING --out-interface $INTERNET_IFACE -j MASQUERADE
|
|
iptables --append FORWARD --in-interface $USB_IFACE -j ACCEPT
|
|
echo 1 > /proc/sys/net/ipv4/ip_forward
|
|
}
|
|
|
|
# Configure network link
|
|
|
|
usb_networking_configure () {
|
|
ifconfig $USB_IFACE up
|
|
ifconfig $USB_IFACE $USB_IFACE_IP
|
|
}
|
|
|
|
usb_networking_disable () {
|
|
ifconfig $USB_IFACE down
|
|
echo 0 > /proc/sys/net/ipv4/ip_forward
|
|
}
|
|
|
|
case $1 in
|
|
"start")
|
|
echo "Starting Replicant USB Networking"
|
|
iptables_rules_clean
|
|
usb_networking_configure
|
|
iptables_forward_rules_apply
|
|
;;
|
|
"stop")
|
|
echo "Stopping Replicant USB Networking"
|
|
usb_networking_disable
|
|
iptables_rules_clean
|
|
;;
|
|
*)
|
|
echo "Usage: sh $0 {start|stop}"
|
|
;;
|
|
esac
|