initial commit

2026-08-27 11:22:16 -06:00
commit 96afff7a83
600 changed files with 29291 additions and 0 deletions
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+using System.Collections.Generic;
+using System.Net;
+using System.Net.Sockets;
+
+namespace Quasar.Common.DNS
+{
+    public class HostsManager
+    {
+        public bool IsEmpty => _hosts.Count == 0;
+
+        private readonly Queue<Host> _hosts = new Queue<Host>();
+
+        public HostsManager(List<Host> hosts)
+        {
+            foreach(var host in hosts)
+                _hosts.Enqueue(host);
+        }
+
+        public Host GetNextHost()
+        {
+            var temp = _hosts.Dequeue();
+            _hosts.Enqueue(temp); // add to the end of the queue
+
+            temp.IpAddress = ResolveHostname(temp);
+            return temp;
+        }
+
+        private static IPAddress ResolveHostname(Host host)
+        {
+            if (string.IsNullOrEmpty(host.Hostname)) return null;
+
+            IPAddress ip;
+            if (IPAddress.TryParse(host.Hostname, out ip))
+            {
+                if (ip.AddressFamily == AddressFamily.InterNetworkV6)
+                {
+                    if (!Socket.OSSupportsIPv6) return null;
+                }
+                return ip;
+            }
+
+            var ipAddresses = Dns.GetHostEntry(host.Hostname).AddressList;
+            foreach (IPAddress ipAddress in ipAddresses)
+            {
+                switch (ipAddress.AddressFamily)
+                {
+                    case AddressFamily.InterNetwork:
+                        return ipAddress;
+                    case AddressFamily.InterNetworkV6:
+                        /* Only use resolved IPv6 if no IPv4 address available,
+                         * otherwise it could be possible that the router the client
+                         * is using to connect to the internet doesn't support IPv6.
+                         */
+                        if (ipAddresses.Length == 1)
+                            return ipAddress;
+                        break;
+                }
+            }
+
+            return ip;
+        }
+    }
+}