1 files changed, 50 insertions, 0 deletions
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index 43fa906..a2eb04d 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -1538,4 +1538,54 @@ void SetExplicitlyAllowedPorts(const std::wstring& allowed_ports) {
   explicitly_allowed_ports = ports;
 }
 
+enum IPv6SupportStatus {
+  IPV6_CANNOT_CREATE_SOCKETS,
+  IPV6_CAN_CREATE_SOCKETS,
+  IPV6_SUPPORT_MAX  // Bounding values for enumeration.
+};
+
+static void IPv6SupportResults(IPv6SupportStatus result) {
+  static bool run_once = false;
+  if (run_once)
+    return;
+  run_once = true;
+  UMA_HISTOGRAM_ENUMERATION("Net.IPv6Status", result, IPV6_SUPPORT_MAX);
+}
+
+// TODO(jar): The following is a simple estimate of IPv6 support.  We may need
+// to do a test resolution, and a test connection, to REALLY verify support.
+// static
+bool IPv6Supported() {
+#if defined(OS_POSIX)
+  int test_socket;
+
+  test_socket = socket(AF_INET6, SOCK_STREAM, 0);
+  if (test_socket == -1) {
+    IPv6SupportResults(IPV6_CANNOT_CREATE_SOCKETS);
+    return false;
+  }
+
+  close(test_socket);
+  IPv6SupportResults(IPV6_CAN_CREATE_SOCKETS);
+  return true;
+#elif defined(OS_WIN)
+  EnsureWinsockInit();
+  SOCKET test_socket;
+
+  test_socket = socket(AF_INET6, SOCK_STREAM, 0);
+  if (test_socket == INVALID_SOCKET) {
+    IPv6SupportResults(IPV6_CANNOT_CREATE_SOCKETS);
+    return false;
+  }
+
+  closesocket(test_socket);
+  IPv6SupportResults(IPV6_CAN_CREATE_SOCKETS);
+  return true;
+#else
+  NOTIMPLEMENTED();
+  return true;
+#endif  // defined(various platforms)
+}
+
+
 }  // namespace net