Add cancellable and AddressFamily-specific name resolution.

src/libraries/Common/src/Interop/Unix/System.Native/Interop.HostEntry.cs

@@ -33,7 +33,7 @@ internal unsafe struct HostEntry
         }
 
         [DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_GetHostEntryForName")]
-        internal static extern unsafe int GetHostEntryForName(string address, HostEntry* entry);
+        internal static extern unsafe int GetHostEntryForName(string address, System.Net.Sockets.AddressFamily family, HostEntry* entry);
 
         [DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_FreeHostEntry")]
         internal static extern unsafe void FreeHostEntry(HostEntry* entry);

src/libraries/Common/src/Interop/Windows/WinSock/Interop.GetAddrInfoExW.cs

@@ -11,6 +11,9 @@ internal static partial class Interop
 {
     internal static partial class Winsock
     {
+        internal const int WSA_INVALID_HANDLE = 6;
+        internal const int WSA_E_CANCELLED = 10111;
+
         internal const string GetAddrInfoExCancelFunctionName = "GetAddrInfoExCancel";
 
         internal const int NS_ALL = 0;
@@ -28,6 +31,9 @@ internal static extern unsafe int GetAddrInfoExW(
             [In] delegate* unmanaged<int, int, NativeOverlapped*, void> lpCompletionRoutine,
             [Out] IntPtr* lpNameHandle);
 
+        [DllImport(Libraries.Ws2_32, ExactSpelling = true)]
+        internal static extern unsafe int GetAddrInfoExCancel([In] IntPtr* lpHandle);
+
         [DllImport(Libraries.Ws2_32, ExactSpelling = true)]
         internal static extern unsafe void FreeAddrInfoExW(AddressInfoEx* pAddrInfo);
 

src/libraries/Native/Unix/System.Native/pal_networking.c

@@ -170,6 +170,80 @@ c_static_assert(offsetof(IOVector, Count) == offsetof(iovec, iov_len));
 
 #define Min(left,right) (((left) < (right)) ? (left) : (right))
 
+static bool TryConvertAddressFamilyPlatformToPal(sa_family_t platformAddressFamily, int32_t* palAddressFamily)
+{
+    assert(palAddressFamily != NULL);
+
+    switch (platformAddressFamily)
+    {
+        case AF_UNSPEC:
+            *palAddressFamily = AddressFamily_AF_UNSPEC;
+            return true;
+
+        case AF_UNIX:
+            *palAddressFamily = AddressFamily_AF_UNIX;
+            return true;
+
+        case AF_INET:
+            *palAddressFamily = AddressFamily_AF_INET;
+            return true;
+
+        case AF_INET6:
+            *palAddressFamily = AddressFamily_AF_INET6;
+            return true;
+#ifdef AF_PACKET
+        case AF_PACKET:
+            *palAddressFamily = AddressFamily_AF_PACKET;
+            return true;
+#endif
+#ifdef AF_CAN
+        case AF_CAN:
+            *palAddressFamily = AddressFamily_AF_CAN;
+            return true;
+#endif
+        default:
+            *palAddressFamily = platformAddressFamily;
+            return false;
+    }
+}
+
+static bool TryConvertAddressFamilyPalToPlatform(int32_t palAddressFamily, sa_family_t* platformAddressFamily)
+{
+    assert(platformAddressFamily != NULL);
+
+    switch (palAddressFamily)
+    {
+        case AddressFamily_AF_UNSPEC:
+            *platformAddressFamily = AF_UNSPEC;
+            return true;
+
+        case AddressFamily_AF_UNIX:
+            *platformAddressFamily = AF_UNIX;
+            return true;
+
+        case AddressFamily_AF_INET:
+            *platformAddressFamily = AF_INET;
+            return true;
+
+        case AddressFamily_AF_INET6:
+            *platformAddressFamily = AF_INET6;
+            return true;
+#ifdef AF_PACKET
+        case AddressFamily_AF_PACKET:
+            *platformAddressFamily = AF_PACKET;
+            return true;
+#endif
+#ifdef AF_CAN
+        case AddressFamily_AF_CAN:
+            *platformAddressFamily = AF_CAN;
+            return true;
+#endif
+        default:
+            *platformAddressFamily = (sa_family_t)palAddressFamily;
+            return false;
+    }
+}
+
 static void ConvertByteArrayToIn6Addr(struct in6_addr* addr, const uint8_t* buffer, int32_t bufferLength)
 {
     assert(bufferLength == NUM_BYTES_IN_IPV6_ADDRESS);
@@ -261,7 +335,7 @@ static int32_t CopySockAddrToIPAddress(sockaddr* addr, sa_family_t family, IPAdd
     return -1;
 }
 
-int32_t SystemNative_GetHostEntryForName(const uint8_t* address, HostEntry* entry)
+int32_t SystemNative_GetHostEntryForName(const uint8_t* address, int32_t addressFamily, HostEntry* entry)
 {
     if (address == NULL || entry == NULL)
     {
@@ -275,11 +349,16 @@ int32_t SystemNative_GetHostEntryForName(const uint8_t* address, HostEntry* entr
     struct ifaddrs* addrs = NULL;
 #endif
 
-    // Get all address families and the canonical name
+    sa_family_t platformFamily;
+    if (!TryConvertAddressFamilyPalToPlatform(addressFamily, &platformFamily))
+    {
+        return GetAddrInfoErrorFlags_EAI_FAMILY;
+    }
+
     struct addrinfo hint;
     memset(&hint, 0, sizeof(struct addrinfo));
-    hint.ai_family = AF_UNSPEC;
     hint.ai_flags = AI_CANONNAME;
+    hint.ai_family = platformFamily;
 
     int result = getaddrinfo((const char*)address, NULL, &hint, &info);
     if (result != 0)
@@ -593,80 +672,6 @@ int32_t SystemNative_GetIPSocketAddressSizes(int32_t* ipv4SocketAddressSize, int
     return Error_SUCCESS;
 }
 
-static bool TryConvertAddressFamilyPlatformToPal(sa_family_t platformAddressFamily, int32_t* palAddressFamily)
-{
-    assert(palAddressFamily != NULL);
-
-    switch (platformAddressFamily)
-    {
-        case AF_UNSPEC:
-            *palAddressFamily = AddressFamily_AF_UNSPEC;
-            return true;
-
-        case AF_UNIX:
-            *palAddressFamily = AddressFamily_AF_UNIX;
-            return true;
-
-        case AF_INET:
-            *palAddressFamily = AddressFamily_AF_INET;
-            return true;
-
-        case AF_INET6:
-            *palAddressFamily = AddressFamily_AF_INET6;
-            return true;
-#ifdef AF_PACKET
-        case AF_PACKET:
-            *palAddressFamily = AddressFamily_AF_PACKET;
-            return true;
-#endif
-#ifdef AF_CAN
-        case AF_CAN:
-            *palAddressFamily = AddressFamily_AF_CAN;
-            return true;
-#endif
-        default:
-            *palAddressFamily = platformAddressFamily;
-            return false;
-    }
-}
-
-static bool TryConvertAddressFamilyPalToPlatform(int32_t palAddressFamily, sa_family_t* platformAddressFamily)
-{
-    assert(platformAddressFamily != NULL);
-
-    switch (palAddressFamily)
-    {
-        case AddressFamily_AF_UNSPEC:
-            *platformAddressFamily = AF_UNSPEC;
-            return true;
-
-        case AddressFamily_AF_UNIX:
-            *platformAddressFamily = AF_UNIX;
-            return true;
-
-        case AddressFamily_AF_INET:
-            *platformAddressFamily = AF_INET;
-            return true;
-
-        case AddressFamily_AF_INET6:
-            *platformAddressFamily = AF_INET6;
-            return true;
-#ifdef AF_PACKET
-        case AddressFamily_AF_PACKET:
-            *platformAddressFamily = AF_PACKET;
-            return true;
-#endif
-#ifdef AF_CAN
-        case AddressFamily_AF_CAN:
-            *platformAddressFamily = AF_CAN;
-            return true;
-#endif
-        default:
-            *platformAddressFamily = (sa_family_t)palAddressFamily;
-            return false;
-    }
-}
-
 int32_t SystemNative_GetAddressFamily(const uint8_t* socketAddress, int32_t socketAddressLen, int32_t* addressFamily)
 {
     if (socketAddress == NULL || addressFamily == NULL || socketAddressLen < 0)

src/libraries/Native/Unix/System.Native/pal_networking.h

@@ -301,7 +301,7 @@ typedef struct
     uint32_t Padding;    // Pad out to 8-byte alignment
 } SocketEvent;
 
-PALEXPORT int32_t SystemNative_GetHostEntryForName(const uint8_t* address, HostEntry* entry);
+PALEXPORT int32_t SystemNative_GetHostEntryForName(const uint8_t* address, int32_t addressFamily, HostEntry* entry);
 
 PALEXPORT void SystemNative_FreeHostEntry(HostEntry* entry);
 

src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/AuthenticationHelper.NtAuth.cs

@@ -110,7 +110,7 @@ private static async Task<HttpResponseMessage> SendWithNtAuthAsync(HttpRequestMe
                             }
                             else
                             {
-                                IPHostEntry result = await Dns.GetHostEntryAsync(authUri.IdnHost).ConfigureAwait(false);
+                                IPHostEntry result = await Dns.GetHostEntryAsync(authUri.IdnHost, cancellationToken).ConfigureAwait(false);
                                 hostName = result.HostName;
                             }
 

src/libraries/System.Net.NameResolution/ref/System.Net.NameResolution.cs

@@ -22,7 +22,10 @@ public static partial class Dns
         [System.ObsoleteAttribute("EndResolve is obsoleted for this type, please use EndGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
         public static System.Net.IPHostEntry EndResolve(System.IAsyncResult asyncResult) { throw null; }
         public static System.Net.IPAddress[] GetHostAddresses(string hostNameOrAddress) { throw null; }
+        public static System.Net.IPAddress[] GetHostAddresses(string hostNameOrAddress, System.Net.Sockets.AddressFamily family) { throw null; }
         public static System.Threading.Tasks.Task<System.Net.IPAddress[]> GetHostAddressesAsync(string hostNameOrAddress) { throw null; }
+        public static System.Threading.Tasks.Task<System.Net.IPAddress[]> GetHostAddressesAsync(string hostNameOrAddress, System.Net.Sockets.AddressFamily family, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public static System.Threading.Tasks.Task<System.Net.IPAddress[]> GetHostAddressesAsync(string hostNameOrAddress, System.Threading.CancellationToken cancellationToken) { throw null; }
         [System.ObsoleteAttribute("GetHostByAddress is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
         public static System.Net.IPHostEntry GetHostByAddress(System.Net.IPAddress address) { throw null; }
         [System.ObsoleteAttribute("GetHostByAddress is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
@@ -31,8 +34,11 @@ public static partial class Dns
         public static System.Net.IPHostEntry GetHostByName(string hostName) { throw null; }
         public static System.Net.IPHostEntry GetHostEntry(System.Net.IPAddress address) { throw null; }
         public static System.Net.IPHostEntry GetHostEntry(string hostNameOrAddress) { throw null; }
+        public static System.Net.IPHostEntry GetHostEntry(string hostNameOrAddress, System.Net.Sockets.AddressFamily family) { throw null; }
         public static System.Threading.Tasks.Task<System.Net.IPHostEntry> GetHostEntryAsync(System.Net.IPAddress address) { throw null; }
         public static System.Threading.Tasks.Task<System.Net.IPHostEntry> GetHostEntryAsync(string hostNameOrAddress) { throw null; }
+        public static System.Threading.Tasks.Task<System.Net.IPHostEntry> GetHostEntryAsync(string hostNameOrAddress, System.Net.Sockets.AddressFamily family, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public static System.Threading.Tasks.Task<System.Net.IPHostEntry> GetHostEntryAsync(string hostNameOrAddress, System.Threading.CancellationToken cancellationToken) { throw null; }
         public static string GetHostName() { throw null; }
         [System.ObsoleteAttribute("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
         public static System.Net.IPHostEntry Resolve(string hostName) { throw null; }