Bind to specific IP addresses if provided with any

This still only applies to IPv4.

#98

src/Microsoft.AspNet.Server.Kestrel/Http/TcpListener.cs

@@ -25,7 +25,7 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
         {
             var socket = new UvTcpHandle(Log);
             socket.Init(Thread.Loop, Thread.QueueCloseHandle);
-            socket.Bind(new IPEndPoint(IPAddress.Any, port));
+            socket.Bind(host, port);
             socket.Listen(Constants.ListenBacklog, ConnectionCallback, this);
             return socket;
         }

src/Microsoft.AspNet.Server.Kestrel/Http/TcpListenerPrimary.cs

@@ -25,7 +25,7 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
         {
             var socket = new UvTcpHandle(Log);
             socket.Init(Thread.Loop, Thread.QueueCloseHandle);
-            socket.Bind(new IPEndPoint(IPAddress.Any, port));
+            socket.Bind(host, port);
             socket.Listen(Constants.ListenBacklog, ConnectionCallback, this);
             return socket;
         }

src/Microsoft.AspNet.Server.Kestrel/Networking/UvTcpHandle.cs

@@ -33,8 +33,10 @@ namespace Microsoft.AspNet.Server.Kestrel.Networking
             _uv.tcp_init(loop, this);
         }
 
-        public void Bind(IPEndPoint endpoint)
+        public void Bind(string host, int port)
         {
+            var endpoint = CreateIPEndpoint(host, port);
+
             Libuv.sockaddr addr;
             var addressText = endpoint.Address.ToString();
 
@@ -58,5 +60,29 @@ namespace Microsoft.AspNet.Server.Kestrel.Networking
         {
             _uv.tcp_open(this, hSocket);
         }
+
+        /// <summary>
+        /// Returns an <see cref="IPEndPoint"/> for the given host an port.
+        /// If the host parameter isn't "localhost" or an IP address, use IPAddress.Any.
+        /// </summary>
+        public static IPEndPoint CreateIPEndpoint(string host, int port)
+        {
+            // TODO: IPv6 support
+            IPAddress ip;
+
+            if (!IPAddress.TryParse(host, out ip))
+            {
+                if (string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase))
+                {
+                    ip = IPAddress.Loopback;
+                }
+                else
+                {
+                    ip = IPAddress.Any;
+                }
+            }
+
+            return new IPEndPoint(ip, port);
+        }
     }
 }

test/Microsoft.AspNet.Server.KestrelTests/CreateIPEndpointTests.cs

@@ -0,0 +1,25 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Net;
+using Microsoft.AspNet.Server.Kestrel.Networking;
+using Xunit;
+
+namespace Microsoft.AspNet.Server.KestrelTests
+{
+    public class CreateIPEndpointTests
+    {
+        [Theory]
+        [InlineData("localhost", "127.0.0.1")]
+        [InlineData("10.10.10.10", "10.10.10.10")]
+        [InlineData("randomhost", "0.0.0.0")]
+        public void CorrectIPEndpointsAreCreated(string host, string expectedAddress)
+        {
+            // "0.0.0.0" is IPAddress.Any
+            var endpoint = UvTcpHandle.CreateIPEndpoint(host, 5000);
+            Assert.NotNull(endpoint);
+            Assert.Equal(IPAddress.Parse(expectedAddress), endpoint.Address);
+            Assert.Equal(5000, endpoint.Port);
+        }
+    }
+}

test/Microsoft.AspNet.Server.KestrelTests/MultipleLoopTests.cs

@@ -166,7 +166,7 @@ namespace Microsoft.AspNet.Server.KestrelTests
 
             var serverListenTcp = new UvTcpHandle(_logger);
             serverListenTcp.Init(loop);
-            serverListenTcp.Bind(new IPEndPoint(0, 54321));
+            serverListenTcp.Bind("0.0.0.0", 54321);
             serverListenTcp.Listen(128, (_1, status, error, _2) =>
             {
                 var serverConnectionTcp = new UvTcpHandle(_logger);

test/Microsoft.AspNet.Server.KestrelTests/NetworkingTests.cs

@@ -81,7 +81,7 @@ namespace Microsoft.AspNet.Server.KestrelTests
             loop.Init(_uv);
             var tcp = new UvTcpHandle(_logger);
             tcp.Init(loop);
-            tcp.Bind(new IPEndPoint(IPAddress.Loopback, 0));
+            tcp.Bind("localhost", 0);
             tcp.Dispose();
             loop.Run();
             loop.Dispose();
@@ -95,7 +95,7 @@ namespace Microsoft.AspNet.Server.KestrelTests
             loop.Init(_uv);
             var tcp = new UvTcpHandle(_logger);
             tcp.Init(loop);
-            tcp.Bind(new IPEndPoint(IPAddress.Loopback, 54321));
+            tcp.Bind("localhost", 54321);
             tcp.Listen(10, (stream, status, error, state) =>
             {
                 var tcp2 = new UvTcpHandle(_logger);
@@ -132,7 +132,7 @@ namespace Microsoft.AspNet.Server.KestrelTests
             loop.Init(_uv);
             var tcp = new UvTcpHandle(_logger);
             tcp.Init(loop);
-            tcp.Bind(new IPEndPoint(IPAddress.Loopback, 54321));
+            tcp.Bind("localhost", 54321);
             tcp.Listen(10, (_, status, error, state) =>
             {
                 Console.WriteLine("Connected");
@@ -188,7 +188,7 @@ namespace Microsoft.AspNet.Server.KestrelTests
             loop.Init(_uv);
             var tcp = new UvTcpHandle(_logger);
             tcp.Init(loop);
-            tcp.Bind(new IPEndPoint(IPAddress.Loopback, 54321));
+            tcp.Bind("localhost", 54321);
             tcp.Listen(10, (_, status, error, state) =>
             {
                 Console.WriteLine("Connected");