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|
#!/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
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