mirror of
https://github.com/fatedier/frp.git
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110 lines
2.3 KiB
Go
110 lines
2.3 KiB
Go
// Copyright 2025 The frp Authors
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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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package vnet
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import (
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"context"
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"io"
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"github.com/fatedier/golib/pool"
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"golang.zx2c4.com/wireguard/tun"
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)
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const (
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offset = 16
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defaultPacketSize = 1420
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)
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type TunDevice interface {
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io.ReadWriteCloser
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}
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func OpenTun(ctx context.Context, addr string) (TunDevice, error) {
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td, err := openTun(ctx, addr)
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if err != nil {
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return nil, err
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}
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mtu, err := td.MTU()
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if err != nil {
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mtu = defaultPacketSize
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}
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bufferSize := max(mtu, defaultPacketSize)
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batchSize := td.BatchSize()
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device := &tunDeviceWrapper{
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dev: td,
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bufferSize: bufferSize,
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readBuffers: make([][]byte, batchSize),
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sizeBuffer: make([]int, batchSize),
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}
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for i := range device.readBuffers {
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device.readBuffers[i] = make([]byte, offset+bufferSize)
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}
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return device, nil
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}
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type tunDeviceWrapper struct {
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dev tun.Device
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bufferSize int
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readBuffers [][]byte
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packetBuffers [][]byte
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sizeBuffer []int
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}
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func (d *tunDeviceWrapper) Read(p []byte) (int, error) {
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if len(d.packetBuffers) > 0 {
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n := copy(p, d.packetBuffers[0])
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d.packetBuffers = d.packetBuffers[1:]
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return n, nil
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}
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n, err := d.dev.Read(d.readBuffers, d.sizeBuffer, offset)
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if err != nil {
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return 0, err
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}
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if n == 0 {
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return 0, io.EOF
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}
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for i := range n {
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if d.sizeBuffer[i] <= 0 {
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continue
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}
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d.packetBuffers = append(d.packetBuffers, d.readBuffers[i][offset:offset+d.sizeBuffer[i]])
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}
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dataSize := copy(p, d.packetBuffers[0])
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d.packetBuffers = d.packetBuffers[1:]
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return dataSize, nil
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}
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func (d *tunDeviceWrapper) Write(p []byte) (int, error) {
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buf := pool.GetBuf(offset + d.bufferSize)
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defer pool.PutBuf(buf)
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n := copy(buf[offset:], p)
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_, err := d.dev.Write([][]byte{buf[:offset+n]}, offset)
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return n, err
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}
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func (d *tunDeviceWrapper) Close() error {
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return d.dev.Close()
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}
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