回退dns使用tcp查询
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陈国伟
parent
052eedaf10
commit
8adbacc16e
@ -86,7 +86,7 @@ disabled_server_names = []
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## (dnscrypt-proxy will always encrypt everything even using UDP), and can
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## only increase latency.
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force_tcp = false
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force_tcp = true
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## SOCKS proxy
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@ -223,7 +223,7 @@ cert_refresh_delay = 240
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##
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## If more than one resolver is specified, they will be tried in sequence.
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fallback_resolvers = []
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fallback_resolvers = ['9.9.9.9:53', '8.8.8.8:53']
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## Always use the fallback resolver before the system DNS settings.
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@ -1,5 +1,6 @@
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using DNS.Client;
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using DNS.Client.RequestResolver;
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using DNS.Protocol;
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using DNS.Protocol.ResourceRecords;
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using FastGithub.Configuration;
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using Microsoft.Extensions.Caching.Memory;
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using Microsoft.Extensions.Logging;
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@ -23,30 +24,29 @@ namespace FastGithub.DomainResolve
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private readonly IMemoryCache domainResolveCache = new MemoryCache(Options.Create(new MemoryCacheOptions()));
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private readonly IMemoryCache disableIPAddressCache = new MemoryCache(Options.Create(new MemoryCacheOptions()));
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private readonly FastGithubConfig fastGithubConfig;
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private readonly DnscryptProxy dnscryptProxy;
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private readonly ILogger<DomainResolver> logger;
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private readonly TimeSpan lookupTimeout = TimeSpan.FromSeconds(5d);
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private readonly TimeSpan connectTimeout = TimeSpan.FromSeconds(5d);
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private readonly TimeSpan disableIPExpiration = TimeSpan.FromMinutes(2d);
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private readonly TimeSpan dnscryptExpiration = TimeSpan.FromMinutes(10d);
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private readonly TimeSpan systemExpiration = TimeSpan.FromMinutes(2d);
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private readonly TimeSpan fallbackExpiration = TimeSpan.FromMinutes(2d);
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private readonly TimeSpan loopbackExpiration = TimeSpan.FromSeconds(5d);
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private readonly IPEndPoint fallbackDns = new(IPAddress.Parse("114.114.114.114"), 53);
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private readonly ConcurrentDictionary<DnsEndPoint, SemaphoreSlim> semaphoreSlims = new();
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/// <summary>
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/// 域名解析器
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/// </summary>
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/// <param name="fastGithubConfig"></param>
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/// <param name="dnscryptProxy"></param>
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/// <param name="logger"></param>
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public DomainResolver(
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FastGithubConfig fastGithubConfig,
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DnscryptProxy dnscryptProxy,
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ILogger<DomainResolver> logger)
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{
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this.fastGithubConfig = fastGithubConfig;
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this.dnscryptProxy = dnscryptProxy;
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this.logger = logger;
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}
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@ -114,10 +114,10 @@ namespace FastGithub.DomainResolve
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address = await this.LookupByDnscryptAsync(domain, cancellationToken);
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}
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if (address == null && OperatingSystem.IsWindows() == false)
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if (address == null)
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{
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expiration = this.systemExpiration;
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address = await this.LookupByDnsSystemAsync(domain, cancellationToken);
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expiration = this.fallbackExpiration;
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address = await this.LookupByFallbackAsync(domain, cancellationToken);
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}
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if (address == null)
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@ -150,57 +150,58 @@ namespace FastGithub.DomainResolve
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return null;
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}
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try
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{
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var dnsClient = new DnsClient(dns);
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var addresses = await dnsClient.Lookup(domain.Host, RecordType.A, cancellationToken);
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var address = await this.FindFastValueAsync(addresses, domain.Port, cancellationToken);
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if (address == null)
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{
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this.logger.LogWarning($"dns({dns})解析不到{domain.Host}可用的ip解析");
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}
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else
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{
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this.logger.LogInformation($"dns({dns}): {domain.Host}->{address}");
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}
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return address;
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}
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catch (Exception ex)
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{
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cancellationToken.ThrowIfCancellationRequested();
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this.logger.LogWarning($"dns({dns})无法解析{domain.Host}：{ex.Message}");
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return null;
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}
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var resolver = new RequestResolver(dns, forceTcp: false);
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return await this.LookupAsync(resolver, domain, cancellationToken);
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}
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/// <summary>
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/// 系统DNS查找ip
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/// 回退查找ip
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/// </summary>
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/// <param name="domain"></param>
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/// <param name="cancellationToken"></param>
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/// <exception cref="OperationCanceledException"></exception>
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/// <returns></returns>
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private async Task<IPAddress?> LookupByDnsSystemAsync(DnsEndPoint domain, CancellationToken cancellationToken)
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private async Task<IPAddress?> LookupByFallbackAsync(DnsEndPoint domain, CancellationToken cancellationToken)
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{
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var resolver = new RequestResolver(this.fallbackDns, forceTcp: true);
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return await this.LookupAsync(resolver, domain, cancellationToken);
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}
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/// <summary>
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/// 查找ip
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/// </summary>
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/// <param name="resolver"></param>
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/// <param name="domain"></param>
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/// <param name="cancellationToken"></param>
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/// <returns></returns>
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private async Task<IPAddress?> LookupAsync(IRequestResolver resolver, DnsEndPoint domain, CancellationToken cancellationToken)
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{
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try
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{
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var allAddresses = await Dns.GetHostAddressesAsync(domain.Host);
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var addresses = allAddresses.Where(item => item.AddressFamily == AddressFamily.InterNetwork);
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var request = new Request();
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request.Questions.Add(new Question(new Domain(domain.Host), RecordType.A));
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using var timeoutTokenSource = new CancellationTokenSource(this.lookupTimeout);
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using var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, timeoutTokenSource.Token);
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var response = await resolver.Resolve(request, linkedTokenSource.Token);
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var addresses = response.AnswerRecords.OfType<IPAddressResourceRecord>().Select(item => item.IPAddress).ToArray();
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var address = await this.FindFastValueAsync(addresses, domain.Port, cancellationToken);
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if (address == null)
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{
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this.logger.LogWarning($"dns(系统)解析不到{domain.Host}可用的ip解析");
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this.logger.LogWarning($"dns({resolver})解析不到{domain.Host}可用的ip解析");
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}
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else
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{
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this.logger.LogInformation($"dns(系统): {domain.Host}->{address}");
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this.logger.LogInformation($"dns({resolver}): {domain.Host}->{address}");
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}
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return address;
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}
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catch (Exception ex)
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{
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cancellationToken.ThrowIfCancellationRequested();
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this.logger.LogWarning($"dns(系统)无法解析{domain.Host}：{ex.Message}");
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this.logger.LogWarning($"dns({resolver})无法解析{domain.Host}：{ex.Message}");
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return default;
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}
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}
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@ -268,5 +269,32 @@ namespace FastGithub.DomainResolve
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return default;
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}
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}
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/// <summary>
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/// 请求解析器
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/// </summary>
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private class RequestResolver : IRequestResolver
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{
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private readonly IPEndPoint dns;
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private readonly IRequestResolver resolver;
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public RequestResolver(IPEndPoint dns, bool forceTcp)
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{
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this.dns = dns;
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this.resolver = forceTcp
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? new TcpRequestResolver(dns)
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: new UdpRequestResolver(dns, new TcpRequestResolver(dns));
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}
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public Task<IResponse> Resolve(IRequest request, CancellationToken cancellationToken = default)
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{
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return this.resolver.Resolve(request, cancellationToken);
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}
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public override string ToString()
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{
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return this.dns.ToString();
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}
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}
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}
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}
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