101 lines
2.2 KiB
Bash
101 lines
2.2 KiB
Bash
#!/bin/sh
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#
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# Copyright (C) 2012 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Backchannel control script - sets up and tears down backchannel network
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# interfaces. Backchannel interfaces are hidden from flimflam and will never be
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# the default route.
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#
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# A backchannel interface can also be used to simulate a cellular
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# modem used by fake-cromo if the new interface name is set to
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# pseudo-modem0
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#
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test_if=eth_test
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usage () {
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echo "Usage: $0 <command> [args...]"
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echo " setup <iface> [new_iface_name] Set <iface> as backchannel device"
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echo " teardown <iface> [new_iface_name] Return backchannel device to normal"
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echo " reach <ip> <gw> [new_iface_name] Route <ip> via gateway <gw>"
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}
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macaddr() {
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ip addr show "$1" | awk '/link\/ether/ { print $2 }'
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}
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ipaddr_with_subnet_mask() {
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ip addr show "$1" | awk '/inet / { print $2 }'
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}
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# We need to down the interface (and therefore stop flimflam) across the
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# invocation of nameif, according to nameif(1).
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renameif() {
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old="$1" ; shift
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new="$1" ; shift
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initctl stop shill
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ip link set "$old" down
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nameif "$new" $(macaddr "$old")
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ip link set "$new" up
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initctl start shill
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}
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setup() {
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oldip=$(ipaddr_with_subnet_mask "$1")
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if [ ! -z $2 ] ; then
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test_if="$2"
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fi
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renameif "$1" "$test_if"
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ip addr add "$oldip" dev "$test_if"
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}
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teardown() {
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if [ ! -z $2 ] ; then
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test_if="$2"
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fi
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renameif "$test_if" "$1"
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}
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reach() {
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ip="$1" ; shift
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gw="$1" ; shift
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if [ ! -z $1 ] ; then
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test_if="$1"
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fi
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ip route add "$ip" via "$gw" dev "$test_if"
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}
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if [ -z "$1" ]; then
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usage
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exit 1
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fi
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command="$1" ; shift
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case "$command" in
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setup)
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setup "$@"
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;;
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teardown)
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teardown "$@"
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;;
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reach)
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reach "$@"
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;;
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*)
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usage
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;;
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esac
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