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dong
2025-06-30 22:09:09 +08:00
parent 8c808def16
commit 2de793ebf5
47 changed files with 2974 additions and 212 deletions
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.vs/Ntpsync/v17/DocumentLayout.backup.json
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.vs/Ntpsync/v17/DocumentLayout.json
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DnsResolver.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using DnsClient;
using DnsClient.Protocol;
using RestSharp;
namespace Ntpsync
{
/// <summary>
/// 使用 DoH/DoT 安全解析 DNS，绕过本地系统 DNS
/// </summary>
internal static class DnsResolver
{
#region 服务器列表
private static readonly List<string> _dohServers = new List<string>
{
"https://dns.alidns.com/resolve", // AliDNS
"https://doh.pub/dns-query", // Tencent DoH
"https://dns.google/resolve", // Google DoH
"https://cloudflare-dns.com/dns-query" // Cloudflare DoH
};
private static readonly List<NameServer> _dotServers = new List<NameServer>
{
new NameServer(IPAddress.Parse("223.5.5.5"), 853), // AliDNS
new NameServer(IPAddress.Parse("1.12.12.12"), 853),// Tencent DoT
new NameServer(IPAddress.Parse("8.8.8.8"), 853), // Google DoT
new NameServer(IPAddress.Parse("1.1.1.1"), 853) // Cloudflare DoT
};
#endregion
public static async Task<string> AdvancedDnsResolveAsync(string domain, CancellationToken parentToken)
{
if (string.IsNullOrWhiteSpace(domain)) return string.Empty;
string resolvedIp = await ResolveWithDoHAsync(domain, parentToken);
if (!string.IsNullOrEmpty(resolvedIp))
{
Logger.Log($"DoH 成功解析 {domain} -> {resolvedIp}");
return resolvedIp;
}
resolvedIp = await ResolveWithDoTAsync(domain, parentToken);
if (!string.IsNullOrEmpty(resolvedIp))
{
Logger.Log($"DoT 成功解析 {domain} -> {resolvedIp}");
return resolvedIp;
}
Logger.Log($"所有 DoH/DoT 方法均无法解析域名: {domain}");
return string.Empty;
}
#region DoH 实现
private static async Task<string> ResolveWithDoHAsync(string domain, CancellationToken parentToken)
{
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(parentToken))
{
var tasks = _dohServers.Select(server => ResolveSingleDoHAsync(server, domain, cts.Token)).ToList();
while (tasks.Any())
{
var finishedTask = await Task.WhenAny(tasks);
tasks.Remove(finishedTask);
string result = await finishedTask;
if (!string.IsNullOrEmpty(result))
{
cts.Cancel();
return result;
}
}
}
return string.Empty;
}
private static async Task<string> ResolveSingleDoHAsync(string server, string domain, CancellationToken token)
{
try
{
token.ThrowIfCancellationRequested();
string url = server.Contains("?") ? $"{server}&name={domain}&type=A" : $"{server}?name={domain}&type=A";
var options = new RestClientOptions(url) { UserAgent = "Ntpsync/1.0" };
var client = new RestClient(options);
var request = new RestRequest().AddHeader("Accept", "application/dns-json");
using (var requestCts = CancellationTokenSource.CreateLinkedTokenSource(token))
{
requestCts.CancelAfter(TimeSpan.FromSeconds(2));
var response = await client.ExecuteAsync(request, requestCts.Token);
if (response.IsSuccessful && !string.IsNullOrEmpty(response.Content))
{
return ExtractIpFromDohResponse(response.Content);
}
}
}
catch (OperationCanceledException) { /* Timeout or parent cancellation is expected */ }
catch (Exception ex) { Logger.Log($"DoH 服务器 {server} 查询失败: {ex.Message}"); }
return null;
}
private static string ExtractIpFromDohResponse(string jsonContent)
{
try
{
using (JsonDocument doc = JsonDocument.Parse(jsonContent))
{
if (doc.RootElement.TryGetProperty("Answer", out var answers))
{
foreach (var answer in answers.EnumerateArray())
{
if (answer.TryGetProperty("type", out var type) && type.GetInt32() == 1 && // A record
answer.TryGetProperty("data", out var data))
{
return data.GetString();
}
}
}
}
}
catch (Exception ex)
{
Logger.Log($"解析 DoH JSON 失败: {ex.Message}");
}
return string.Empty;
}
#endregion
#region DoT 实现
private static async Task<string> ResolveWithDoTAsync(string domain, CancellationToken parentToken)
{
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(parentToken))
{
var tasks = _dotServers.Select(server => ResolveSingleDoTAsync(server, domain, cts.Token)).ToList();
while (tasks.Any())
{
var finishedTask = await Task.WhenAny(tasks);
tasks.Remove(finishedTask);
string result = await finishedTask;
if (!string.IsNullOrEmpty(result))
{
cts.Cancel();
return result;
}
}
}
return string.Empty;
}
private static async Task<string> ResolveSingleDoTAsync(NameServer server, string domain, CancellationToken token)
{
try
{
token.ThrowIfCancellationRequested();
var options = new LookupClientOptions(server) { UseCache = false, Timeout = TimeSpan.FromSeconds(2) };
var client = new LookupClient(options);
var result = await client.QueryAsync(domain, QueryType.A, QueryClass.IN, token);
return result.Answers.ARecords().FirstOrDefault()?.Address.ToString();
}
catch (OperationCanceledException) { /* Expected */ }
catch (DnsResponseException ex) when (ex.Code == DnsResponseCode.ConnectionTimeout || ex.Code == DnsResponseCode.ServerFailure) { /* Expected */ }
catch (Exception ex) { Logger.Log($"DoT 服务器 {server.Address} 查询失败: {ex.Message}"); }
return null;
}
#endregion
}
}

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FodyWeavers.xml Normal file
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@@ -0,0 +1,3 @@
<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
<Costura />
</Weavers>

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FodyWeavers.xsd Normal file
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@@ -0,0 +1,176 @@
<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<!-- This file was generated by Fody. Manual changes to this file will be lost when your project is rebuilt. -->
<xs:element name="Weavers">
<xs:complexType>
<xs:all>
<xs:element name="Costura" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:all>
<xs:element minOccurs="0" maxOccurs="1" name="ExcludeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of assembly names to exclude from the default action of "embed all Copy Local references", delimited with line breaks</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="IncludeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of assembly names to include from the default action of "embed all Copy Local references", delimited with line breaks.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="ExcludeRuntimeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of runtime assembly names to exclude from the default action of "embed all Copy Local references", delimited with line breaks</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="IncludeRuntimeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of runtime assembly names to include from the default action of "embed all Copy Local references", delimited with line breaks.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="Unmanaged32Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>Obsolete, use UnmanagedWinX86Assemblies instead</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="UnmanagedWinX86Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of unmanaged X86 (32 bit) assembly names to include, delimited with line breaks.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="Unmanaged64Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>Obsolete, use UnmanagedWinX64Assemblies instead.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="UnmanagedWinX64Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of unmanaged X64 (64 bit) assembly names to include, delimited with line breaks.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="UnmanagedWinArm64Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of unmanaged Arm64 (64 bit) assembly names to include, delimited with line breaks.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" maxOccurs="1" name="PreloadOrder" type="xs:string">
<xs:annotation>
<xs:documentation>The order of preloaded assemblies, delimited with line breaks.</xs:documentation>
</xs:annotation>
</xs:element>
</xs:all>
<xs:attribute name="CreateTemporaryAssemblies" type="xs:boolean">
<xs:annotation>
<xs:documentation>This will copy embedded files to disk before loading them into memory. This is helpful for some scenarios that expected an assembly to be loaded from a physical file.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="IncludeDebugSymbols" type="xs:boolean">
<xs:annotation>
<xs:documentation>Controls if .pdbs for reference assemblies are also embedded.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="IncludeRuntimeReferences" type="xs:boolean">
<xs:annotation>
<xs:documentation>Controls if runtime assemblies are also embedded.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="UseRuntimeReferencePaths" type="xs:boolean">
<xs:annotation>
<xs:documentation>Controls whether the runtime assemblies are embedded with their full path or only with their assembly name.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="DisableCompression" type="xs:boolean">
<xs:annotation>
<xs:documentation>Embedded assemblies are compressed by default, and uncompressed when they are loaded. You can turn compression off with this option.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="DisableCleanup" type="xs:boolean">
<xs:annotation>
<xs:documentation>As part of Costura, embedded assemblies are no longer included as part of the build. This cleanup can be turned off.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="DisableEventSubscription" type="xs:boolean">
<xs:annotation>
<xs:documentation>The attach method no longer subscribes to the `AppDomain.AssemblyResolve` (.NET 4.x) and `AssemblyLoadContext.Resolving` (.NET 6.0+) events.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="LoadAtModuleInit" type="xs:boolean">
<xs:annotation>
<xs:documentation>Costura by default will load as part of the module initialization. This flag disables that behavior. Make sure you call CosturaUtility.Initialize() somewhere in your code.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="IgnoreSatelliteAssemblies" type="xs:boolean">
<xs:annotation>
<xs:documentation>Costura will by default use assemblies with a name like 'resources.dll' as a satellite resource and prepend the output path. This flag disables that behavior.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="ExcludeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of assembly names to exclude from the default action of "embed all Copy Local references", delimited with |</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="IncludeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of assembly names to include from the default action of "embed all Copy Local references", delimited with |.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="ExcludeRuntimeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of runtime assembly names to exclude from the default action of "embed all Copy Local references", delimited with |</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="IncludeRuntimeAssemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of runtime assembly names to include from the default action of "embed all Copy Local references", delimited with |.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="Unmanaged32Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>Obsolete, use UnmanagedWinX86Assemblies instead</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="UnmanagedWinX86Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of unmanaged X86 (32 bit) assembly names to include, delimited with |.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="Unmanaged64Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>Obsolete, use UnmanagedWinX64Assemblies instead</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="UnmanagedWinX64Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of unmanaged X64 (64 bit) assembly names to include, delimited with |.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="UnmanagedWinArm64Assemblies" type="xs:string">
<xs:annotation>
<xs:documentation>A list of unmanaged Arm64 (64 bit) assembly names to include, delimited with |.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="PreloadOrder" type="xs:string">
<xs:annotation>
<xs:documentation>The order of preloaded assemblies, delimited with |.</xs:documentation>
</xs:annotation>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:all>
<xs:attribute name="VerifyAssembly" type="xs:boolean">
<xs:annotation>
<xs:documentation>'true' to run assembly verification (PEVerify) on the target assembly after all weavers have been executed.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="VerifyIgnoreCodes" type="xs:string">
<xs:annotation>
<xs:documentation>A comma-separated list of error codes that can be safely ignored in assembly verification.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="GenerateXsd" type="xs:boolean">
<xs:annotation>
<xs:documentation>'false' to turn off automatic generation of the XML Schema file.</xs:documentation>
</xs:annotation>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:schema>

8
Form1.cs
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@@ -8,7 +8,6 @@ using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Threading;
using System.Net.Sockets;
@@ -135,10 +134,9 @@ namespace Ntpsync
byte[] ntpData = new byte[48];
ntpData[0] = 0x1B; // LI = 0 (no warning), VN = 3, Mode = 3 (Client)
// 解析 IPv4 地址
var ipList = await Task.Run(() => Dns.GetHostAddresses(host));
var ipv4 = ipList.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);
if (ipv4 == null)
// 使用 DoH/DoT 解析 IPv4 地址
string ipv4String = await DnsResolver.AdvancedDnsResolveAsync(host, token);
if (string.IsNullOrEmpty(ipv4String) || !IPAddress.TryParse(ipv4String, out var ipv4))
{
return (DateTime.Now, false, $"{host} 无可用 IPv4 地址");
}

190
Ntpsync.csproj
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@@ -1,85 +1,107 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{D0DA1BA3-F3AF-4E6F-A697-FBA31CC7BE6D}</ProjectGuid>
<OutputType>WinExe</OutputType>
<RootNamespace>Ntpsync</RootNamespace>
<AssemblyName>Ntpsync</AssemblyName>
<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
<Deterministic>true</Deterministic>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
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@@ -1,12 +1,13 @@
# NTP时间同步工具
这是一个用C#开发的NTP时间同步工具，能够从多个NTP服务器同时获取时间并自动同步系统时间。
这是一个用C#开发的高可靠性NTP时间同步工具，具备**安全DNS解析**功能，能够在DNS污染或劫持环境下依然正常工作。
## 主要功能
### ✨ 新增功能
### ✨ 核心特性
- **多服务器并发同步**：一次性并发向 12 个 NTP 服务器请求，首个成功即同步
- **抢先成功算法**：首台服务器返回即使用其时间，并取消其余请求
- **安全DNS解析**：集成 DoH (DNS-over-HTTPS) 和 DoT (DNS-over-TLS)，完全绕过本地系统DNS
- **IPv4 专用**：解析并只使用 IPv4 地址，避免 IPv6 导致的连接问题
- **隐藏界面**：程序启动后自动隐藏窗口和任务栏图标，在后台运行
- **管理员权限检查**：自动检测是否以管理员权限运行
@@ -27,34 +28,70 @@ time1.google.com (Google)
time.cloudflare.com (Cloudflare)
```
### 🔒 安全DNS服务器列表
**DoH (DNS-over-HTTPS) 服务器：**
```
dns.alidns.com (阿里云 DoH)
doh.pub (腾讯 DoH)
dns.google (Google DoH)
cloudflare-dns.com (Cloudflare DoH)
```
**DoT (DNS-over-TLS) 服务器：**
```
223.5.5.5:853 (阿里云 DoT)
1.12.12.12:853 (腾讯 DoT)
8.8.8.8:853 (Google DoT)
1.1.1.1:853 (Cloudflare DoT)
```
### 📊 同步算法
1. 同时向所有服务器发送 NTP 请求（UDP/123）
2. **首个成功返回** → 立即设置系统时间，并通过 `CancellationToken` 取消其余请求
3. 其余请求在后台迅速结束（3 秒超时或取消）
4. 同步完成后程序立即退出
1. **安全DNS解析**：优先使用 DoH，失败后尝试 DoT，完全绕过本地DNS设置
2. **并行NTP查询**：同时向所有服务器发送 NTP 请求（UDP/123）
3. **首个成功返回** → 立即设置系统时间，并通过 `CancellationToken` 取消其余请求
4. **快速释放资源**：其余请求在后台迅速结束（2 秒超时或取消）
5. **程序自动退出**：同步完成后程序立即退出
> 说明：旧版"取平均值"逻辑已移除，以提升速度并减少时区差异影响。
### 🔧 技术亮点
- `.NET Framework 4.7.2 / C# 7.3`，纯托管实现
- 强制 IPv4 (`AddressFamily.InterNetwork`) ⇢ 避免 IPv6 Unsupported/Firewall 问题
- `CancellationToken` + `UdpClient.Dispose()` ⇢ 首个成功后快速释放其他套接字
- **零磁盘 I/O**：`Logger` 仅在 DEBUG 输出到 VS"输出"窗口；Release 完全静默
- 单次运行<1 KB 流量，CPU/内存占用可忽略
### 日志示例 (DEBUG 模式)
```
21:05:19.639 开始从多个NTP服务器同步时间 (抢先成功即用)...
21:05:19.693 ntp.aliyun.com 返回时间 2025-06-27 21:05:19
21:05:19.738 使用 从 ntp.aliyun.com 成功获取时间
21:05:19.846 系统时间已同步到 2025-06-27 21:05:19
```
> 说明：采用"抢先成功"模式，以提升同步速度并减少网络负载。
## 运行要求
- Windows 7 或更高版本
- .NET Framework 4.7.2 或更高版本
- **必须以管理员权限运行**（修改系统时间需要管理员权限）
- **网络要求**：支持 HTTPS 和 TLS 连接（用于安全DNS解析）
## 技术架构
### 🔧 核心技术栈
- `.NET Framework 4.7.2 / C# 7.3`，纯托管实现
- **异步并发架构**：`async/await` + `Task.WhenAny` 实现高效并行查询
- **安全DNS解析**：`DnsClient` + `RestSharp` + `System.Text.Json`
- **超时控制**：`CancellationToken` 提供精确的 2 秒超时控制
- **IPv4 强制**：`AddressFamily.InterNetwork` ⇢ 避免 IPv6 相关问题
### 🛡️ 安全特性
- **DNS劫持防护**：DoH/DoT 协议加密DNS查询，防止DNS污染和劫持
- **多重冗余**：4个DoH + 4个DoT服务器，确保DNS解析高可用
- **零磁盘 I/O**：Release模式下完全静默运行，无日志文件
- **资源优化**：首个成功后立即取消其余操作，最小化网络和CPU占用
### 📈 性能指标
- **单次运行流量**：< 2 KB（DNS查询 + NTP同步）
- **内存占用**：< 20 MB
- **同步耗时**：通常 1-3 秒完成
- **DNS解析**：支持并行查询，平均 500ms 内完成
### 日志示例 (DEBUG 模式)
```
21:05:19.639 开始从多个NTP服务器同步时间 (抢先成功即用)...
21:05:19.641 开始访问 ntp.aliyun.com
21:05:19.675 DoH 成功解析 ntp.aliyun.com -> 203.107.6.88
21:05:19.693 ntp.aliyun.com 返回时间 2025-06-27 21:05:19
21:05:19.738 使用 从 ntp.aliyun.com 成功获取时间
21:05:19.846 系统时间已同步到 2025-06-27 21:05:19
21:05:19.847 同步完成，程序即将退出
```
## 使用方法
@@ -68,45 +105,6 @@ time.cloudflare.com (Cloudflare)
2. 设置快捷方式以管理员权限运行
3. 每次开机时程序会自动运行并同步时间
## 程序特性
### 🔒 安全性
- 使用标准NTP协议（RFC 2030）
- 仅读取时间信息，不发送敏感数据
- 本地计算时间平均值，避免单点故障
### 💻 用户体验
- **完全隐藏**：没有可见窗口或任务栏图标
- **自动运行**：启动即同步，无需用户干预
- **详细日志**：控制台显示同步过程和结果
- **错误处理**：友好的错误提示和故障恢复
### 🔧 技术特点
- **异步并发**：并行访问多个NTP服务器
- **超时控制**：3秒连接超时，避免程序卡死
- **内存优化**：自动释放网络资源
- **异常处理**：完善的错误捕获和处理机制
## 日志输出示例
```
程序正在以管理员权限运行。
开始从多个NTP服务器同步时间...
同步前本地时间：2024-01-15 14:30:25
成功从 5/6 个服务器获取时间
✓ 从 ntp.aliyun.com 成功获取时间: 2024-01-15 14:30:27
✓ 从 time.windows.com 成功获取时间: 2024-01-15 14:30:27
✓ 从 pool.ntp.org 成功获取时间: 2024-01-15 14:30:28
✗ 从 time.nist.gov 获取时间失败: 连接超时
✓ 从 ntp1.aliyun.com 成功获取时间: 2024-01-15 14:30:27
✓ 从 ntp2.aliyun.com 成功获取时间: 2024-01-15 14:30:27
计算得出的平均时间：2024-01-15 14:30:27
系统时间同步成功
同步后本地时间：2024-01-15 14:30:27
时间调整：2.13 秒
```
## 故障排除
### ❌ 常见问题
@@ -117,28 +115,59 @@ time.cloudflare.com (Cloudflare)
**问题2：所有NTP服务器都无法连接**
- 检查网络连接
- 检查防火墙设置是否阻止了UDP 123端口
- 尝试手动ping ntp.aliyun.com测试网络
- 检查企业网络是否禁用了NTP协议
**问题3：程序启动后看不到界面**
**问题3：DNS解析失败**
- 检查网络是否支持 HTTPS 连接（DoH需要）
- 检查防火墙是否阻止了 853 端口（DoT需要）
- 检查是否在受限的企业网络环境中
**问题4：程序启动后看不到界面**
- 这是正常现象，程序设计为隐藏运行
- 可以在控制台查看同步日志
- 可以在 Visual Studio 调试模式查看同步日志
- 程序会在后台完成时间同步后自动退出
**问题5：同步速度较慢**
- 正常情况下 1-3 秒内完成，如果超过 5 秒可能是网络问题
- DoH/DoT 解析需要额外时间，但提供了更高的可靠性
- 可通过调试日志查看具体耗时分布
## 依赖项
### NuGet 包
- `DnsClient 1.7.0` - DNS-over-TLS 支持
- `RestSharp 111.4.0` - DNS-over-HTTPS 支持
- `System.Text.Json 8.0.5` - JSON 解析
### 系统要求
- .NET Framework 4.7.2 或更高版本
- Windows 7 或更高版本
- 管理员权限（修改系统时间）
## 开发信息
- 开发语言：C#
- 开发语言：C# 7.3
- 框架：.NET Framework 4.7.2
- UI框架：Windows Forms
- 网络协议：UDP/NTP
- 网络协议：UDP/NTP + HTTPS/DoH + TLS/DoT
## 更新日志
### v3.0 - 安全DNS版本 (最新)
- ✅ **重大升级**：集成 DoH/DoT 安全DNS解析，彻底解决DNS劫持问题
- ✅ 新增多个备用DNS服务器（阿里云、腾讯、Google、Cloudflare）
- ✅ 重构为完全异步架构，提升并发性能
- ✅ 新增 CancellationToken 超时控制机制
- ✅ 新增 NuGet 包依赖管理
- ✅ 修复已知安全漏洞，升级核心依赖
- ✅ 增强网络环境适应性，支持受限网络环境
### v2.0 - 多服务器支持版本
- ✅ 新增多服务器并发同步功能
- ✅ 新增程序隐藏功能
- ✅ 新增自动管理员权限检查
- ✅ 改进错误处理和日志输出
- ✅ 优化同步算法，使用时间平均值
- ✅ 优化同步算法，使用"抢先成功"模式
### v1.0 - 初始版本
- 基础NTP时间同步功能

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2025-06-27 20:21:23.845 程序启动
2025-06-27 20:21:23.846 程序正在以管理员权限运行。
2025-06-27 20:21:23.896 开始从多个NTP服务器同步时间...
2025-06-27 20:21:23.896 同步前本地时间：2025-06-27 20:21:23
2025-06-27 20:25:22.614 程序启动
2025-06-27 20:25:22.615 程序正在以管理员权限运行。
2025-06-27 20:25:22.665 开始从多个NTP服务器同步时间...
2025-06-27 20:25:22.666 同步前本地时间：2025-06-27 20:25:22
2025-06-27 20:25:22.667 开始访问 ntp.aliyun.com
2025-06-27 20:25:27.680 开始访问 time.windows.com
2025-06-27 20:25:30.698 从 ntp.aliyun.com 获取时间失败: NTP 响应超时
2025-06-27 20:25:32.689 开始访问 pool.ntp.org
2025-06-27 20:25:32.696 开始访问 time.nist.gov
2025-06-27 20:25:32.700 开始访问 ntp1.aliyun.com
2025-06-27 20:25:32.702 开始访问 ntp2.aliyun.com
2025-06-27 20:25:35.704 从 pool.ntp.org 获取时间失败: NTP 响应超时
2025-06-27 20:25:35.713 从 time.windows.com 获取时间失败: NTP 响应超时
2025-06-27 20:25:35.751 从 ntp2.aliyun.com 获取时间失败: NTP 响应超时
2025-06-27 20:25:35.755 从 time.nist.gov 获取时间失败: NTP 响应超时
2025-06-27 20:25:35.767 从 ntp1.aliyun.com 获取时间失败: NTP 响应超时
2025-06-27 20:25:35.770 所有NTP服务器都无法连接
2025-06-27 20:29:00.804 程序启动
2025-06-27 20:29:00.805 程序正在以管理员权限运行。
2025-06-27 20:29:00.848 开始从多个NTP服务器同步时间 (抢先成功即用)...
2025-06-27 20:29:00.849 开始访问 ntp.aliyun.com
2025-06-27 20:29:05.860 开始访问 time.windows.com
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