1 files changed, 33 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/socket_windows.cc b/src/core/lib/iomgr/socket_windows.cc
index 2e23409582..999c6646ad 100644
--- a/src/core/lib/iomgr/socket_windows.cc
+++ b/src/core/lib/iomgr/socket_windows.cc
@@ -36,6 +36,7 @@
 #include "src/core/lib/iomgr/iomgr_internal.h"
 #include "src/core/lib/iomgr/pollset.h"
 #include "src/core/lib/iomgr/pollset_windows.h"
+#include "src/core/lib/iomgr/sockaddr_windows.h"
 #include "src/core/lib/iomgr/socket_windows.h"
 
 grpc_winsocket* grpc_winsocket_create(SOCKET socket, const char* name) {
@@ -51,6 +52,10 @@ grpc_winsocket* grpc_winsocket_create(SOCKET socket, const char* name) {
   return r;
 }
 
+SOCKET grpc_winsocket_wrapped_socket(grpc_winsocket* socket) {
+  return socket->socket;
+}
+
 /* Schedule a shutdown of the socket operations. Will call the pending
    operations to abort them. We need to do that this way because of the
    various callsites of that function, which happens to be in various
@@ -148,4 +153,32 @@ void grpc_socket_become_ready(grpc_winsocket* socket,
   if (should_destroy) destroy(socket);
 }
 
+static gpr_once g_probe_ipv6_once = GPR_ONCE_INIT;
+static bool g_ipv6_loopback_available = false;
+
+static void probe_ipv6_once(void) {
+  SOCKET s = socket(AF_INET6, SOCK_STREAM, 0);
+  g_ipv6_loopback_available = 0;
+  if (s == INVALID_SOCKET) {
+    gpr_log(GPR_INFO, "Disabling AF_INET6 sockets because socket() failed.");
+  } else {
+    grpc_sockaddr_in6 addr;
+    memset(&addr, 0, sizeof(addr));
+    addr.sin6_family = AF_INET6;
+    addr.sin6_addr.s6_addr[15] = 1; /* [::1]:0 */
+    if (bind(s, reinterpret_cast<grpc_sockaddr*>(&addr), sizeof(addr)) == 0) {
+      g_ipv6_loopback_available = 1;
+    } else {
+      gpr_log(GPR_INFO,
+              "Disabling AF_INET6 sockets because ::1 is not available.");
+    }
+    closesocket(s);
+  }
+}
+
+int grpc_ipv6_loopback_available(void) {
+  gpr_once_init(&g_probe_ipv6_once, probe_ipv6_once);
+  return g_ipv6_loopback_available;
+}
+
 #endif /* GRPC_WINSOCK_SOCKET */