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Fixed: Don't disable IPv6 in IPv6-only Environment 

Closes #6545
This commit is contained in:
Louis R 2024-03-03 06:20:36 +01:00 committed by GitHub
parent 71c2c0570b
commit 13af6f5779
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GPG Key ID: B5690EEEBB952194
1 changed files with 16 additions and 4 deletions
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20
src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs
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@ -1,7 +1,9 @@
using System;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.NetworkInformation;
using System.Net.Security;
using System.Net.Sockets;
using System.Text;
@ -247,6 +249,18 @@ namespace NzbDrone.Common.Http.Dispatchers
return _credentialCache.Get("credentialCache", () => new CredentialCache());
}
private static bool HasRoutableIPv4Address()
{
// Get all IPv4 addresses from all interfaces and return true if there are any with non-loopback addresses
var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
return networkInterfaces.Any(ni =>
ni.OperationalStatus == OperationalStatus.Up &&
ni.GetIPProperties().UnicastAddresses.Any(ip =>
ip.Address.AddressFamily == AddressFamily.InterNetwork &&
!IPAddress.IsLoopback(ip.Address)));
}
private static async ValueTask<Stream> onConnect(SocketsHttpConnectionContext context, CancellationToken cancellationToken)
{
// 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.
@ -270,10 +284,8 @@ namespace NzbDrone.Common.Http.Dispatchers
}
catch
{
// very naively fallback to ipv4 permanently for this execution based on the response of the first connection attempt.
// note that this may cause users to eventually get switched to ipv4 (on a random failure when they are switching networks, for instance)
// but in the interest of keeping this implementation simple, this is acceptable.
useIPv6 = false;
// Do not retry IPv6 if a routable IPv4 address is available, otherwise continue to attempt IPv6 connections.
useIPv6 = !HasRoutableIPv4Address();
}
finally
{