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parent
71c2c0570b
commit
13af6f5779
@ -1,7 +1,9 @@
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using System;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Http;
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using System.Net.NetworkInformation;
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using System.Net.Security;
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using System.Net.Sockets;
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using System.Text;
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@ -247,6 +249,18 @@ private CredentialCache GetCredentialCache()
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return _credentialCache.Get("credentialCache", () => new CredentialCache());
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}
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private static bool HasRoutableIPv4Address()
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{
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// Get all IPv4 addresses from all interfaces and return true if there are any with non-loopback addresses
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var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
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return networkInterfaces.Any(ni =>
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ni.OperationalStatus == OperationalStatus.Up &&
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ni.GetIPProperties().UnicastAddresses.Any(ip =>
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ip.Address.AddressFamily == AddressFamily.InterNetwork &&
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!IPAddress.IsLoopback(ip.Address)));
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}
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private static async ValueTask<Stream> onConnect(SocketsHttpConnectionContext context, CancellationToken cancellationToken)
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{
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// Until .NET supports an implementation of Happy Eyeballs (https://tools.ietf.org/html/rfc8305#section-2), let's make IPv4 fallback work in a simple way.
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@ -270,10 +284,8 @@ private static async ValueTask<Stream> onConnect(SocketsHttpConnectionContext co
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}
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catch
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{
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// very naively fallback to ipv4 permanently for this execution based on the response of the first connection attempt.
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// note that this may cause users to eventually get switched to ipv4 (on a random failure when they are switching networks, for instance)
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// but in the interest of keeping this implementation simple, this is acceptable.
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useIPv6 = false;
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// Do not retry IPv6 if a routable IPv4 address is available, otherwise continue to attempt IPv6 connections.
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useIPv6 = !HasRoutableIPv4Address();
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}
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finally
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{
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