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91 lines
2.5 KiB
91 lines
2.5 KiB
#!/bin/bash
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#
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# Copyright 2016 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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set -euo pipefail
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function set_route {
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local mode="${1}"
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local ip="${2}"
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local host="${3}"
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local gw="${4}"
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if [ "${mode}" = "ethernet" ]; then
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${ip} route del "${host}" via "${gw}"
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else
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# FIXME: This *should* work for IPv6, but it returns EINVAL.
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${ip} route add "${host}" via "${gw}"
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dbus-send --system --dest=org.chromium.flimflam --print-reply / \
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org.chromium.flimflam.Manager.SetServiceOrder \
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string:"vpn,wifi,ethernet,cellular"
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fi
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}
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function find_route {
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local mode="${1}"
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local host="${2}"
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local ip="ip -4"
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if [[ "${host}" = *:* ]]; then
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ip="ip -6"
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fi
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set_route "${mode}" "${ip}" "${host}" 192.168.231.254
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exit 0
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}
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function parse_netstat {
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local mode="${1}"
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while read -r proto recv_q send_q local foreign state; do
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if [[ "${proto}" = tcp* && \
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("${local}" = *:22 || "${local}" = *:2222) && \
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"${state}" == ESTABLISHED ]]; then
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find_route "${mode}" "${foreign%:*}"
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exit 0
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fi
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done
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echo "Could not find ssh connection in netstat"
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exit 1
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}
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mode="${1:-}"
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if [ "${mode}" != "wifi" -a "${mode}" != "ethernet" ]; then
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echo "Tells shill to prioritize ethernet or wifi, and adds a route"
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echo "back to the ssh/adb host so that the device can still be controlled"
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echo "remotely."
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echo ""
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echo "usage: ${0} { ethernet | wifi }"
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exit 1
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fi
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if [ "${mode}" = "ethernet" ]; then
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# Switch the service order first, because the IP lookup might fail.
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dbus-send --system --dest=org.chromium.flimflam --print-reply / \
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org.chromium.flimflam.Manager.SetServiceOrder \
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string:"vpn,ethernet,wifi,cellular"
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fi
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# Find the first connection to our local port 22 (ssh), then use it to
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# set a static route via eth0.
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# This should ideally use $SSH_CLIENT instead, but that will require enabling
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# transparent mode in sslh because $SSH_CLIENT currently points to
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# 127.0.0.1.
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netstat --tcp --numeric --wide | parse_netstat "${mode}"
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exit 0
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