mirror of https://gitee.com/IrisVega/frp.git
71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
// Copyright 2024 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 system
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import (
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"context"
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"net"
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"os/exec"
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"strings"
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"time"
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)
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func EnableCompatibilityMode() {
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fixTimezone()
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fixDNSResolver()
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}
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// fixTimezone is used to try our best to fix timezone issue on some Android devices.
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func fixTimezone() {
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out, err := exec.Command("/system/bin/getprop", "persist.sys.timezone").Output()
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if err != nil {
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return
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}
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loc, err := time.LoadLocation(strings.TrimSpace(string(out)))
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if err != nil {
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return
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}
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time.Local = loc
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}
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// fixDNSResolver will first attempt to resolve google.com to check if the current DNS is available.
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// If it is not available, it will default to using 8.8.8.8 as the DNS server.
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// This is a workaround for the issue that golang can't get the default DNS servers on Android.
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func fixDNSResolver() {
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// First, we attempt to resolve a domain. If resolution is successful, no modifications are necessary.
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// In real-world scenarios, users may have already configured /etc/resolv.conf, or compiled directly
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// in the Android environment instead of using cross-platform compilation, so this issue does not arise.
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if net.DefaultResolver != nil {
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timeoutCtx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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_, err := net.DefaultResolver.LookupHost(timeoutCtx, "google.com")
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if err == nil {
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return
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}
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}
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// If the resolution fails, use 8.8.8.8 as the DNS server.
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// Note: If there are other methods to obtain the default DNS servers, the default DNS servers should be used preferentially.
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net.DefaultResolver = &net.Resolver{
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PreferGo: true,
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Dial: func(ctx context.Context, network, addr string) (net.Conn, error) {
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if addr == "127.0.0.1:53" || addr == "[::1]:53" {
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addr = "8.8.8.8:53"
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}
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var d net.Dialer
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return d.DialContext(ctx, network, addr)
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},
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}
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}
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