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#!/usr/bin/python3
# Copyright (C) 2020 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http:#www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import fcntl
import struct
import sys
TUNSETIFF = 0x400454ca
IFF_TAP = 0x0002
IFF_NO_PI = 0x1000
IFF_VNET_HDR = 0x4000
tun_fd = int(sys.argv[1])
tap_name = sys.argv[2]
ifr = struct.pack('16sH', tap_name.encode('utf-8'), IFF_TAP | IFF_NO_PI | IFF_VNET_HDR)
fcntl.ioctl(tun_fd, TUNSETIFF, ifr)
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