Add reverse dns lookup as a method on InternetAddress.

runtime/bin/socket_win.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/builtin.h"
 #include "bin/eventhandler.h"
 #include "bin/file.h"
@@ skipping 236 matching lines @@
     if (c->ai_family == AF_INET || c->ai_family == AF_INET6) {
       addresses->SetAt(i, new SocketAddress(c->ai_addr));
       i++;
     }
   }
   freeaddrinfo(info);
   return addresses;
 }
 
 
+const char* Socket::ReverseLookup(RawAddr addr, OSError** os_error) {
+  char* host = new char[NI_MAXHOST];
+  int status = getnameinfo(&addr.addr,
+                           SocketAddress::GetAddrLength(&addr),
+                           host,
+                           NI_MAXHOST,
+                           NULL,
+                           0,
+                           NI_NAMEREQD);
+  if (status != 0) {
+    ASSERT(*os_error == NULL);
+    DWORD error_code = WSAGetLastError();
+    SetLastError(error_code);
+    *os_error = new OSError();
+    delete host;
+    return NULL;
+  }
+  return host;
+}
+
+
 AddressList<InterfaceSocketAddress>* Socket::ListInterfaces(
     int type,
     OSError** os_error) {
   Initialize();
 
   ULONG size = 0;
   DWORD flags = GAA_FLAG_SKIP_ANYCAST |
                 GAA_FLAG_SKIP_MULTICAST |
                 GAA_FLAG_SKIP_DNS_SERVER;
   // Query the size needed.
@@ skipping 133 matching lines @@
                     IPPROTO_TCP,
                     TCP_NODELAY,
                     reinterpret_cast<char *>(&on),
                     sizeof(on)) == 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)