Listen on both IPv4 and IPv6 in grpc examples

Use "localhost" instead of "[::1]", as it resolves to IPv4 and/or IPv6
addresses depending on what the system supports.

PiperOrigin-RevId: 290139289
Change-Id: I5c289a7e30699a8798a792863b728e11da687f2e

Author: KeithMoyer

asylo/examples/grpc_server/README.md

@@ -289,11 +289,11 @@ ABSL_FLAG(int32_t, server_max_lifetime, 300,
 
 ABSL_FLAG(int32_t, port, 0, "Port that the server listens to");
 
-constexpr char kServerAddress[] = "[::1]";
+constexpr char kServerAddress[] = "localhost";
 ```
 
-The address `[::1]` indicates that the server should run locally. Default port
-value 0 indicates that the port will be chosen by the operating system.
+The `localhost` address indicates that the server should run locally. Default
+port value 0 indicates that the port will be chosen by the operating system.
 
 #### gRPC server util module
 

asylo/examples/grpc_server/grpc_server_test.cc

@@ -74,8 +74,8 @@ class GrpcServerTest : public ::testing::Test {
   // returns the translated word, else returns a non-OK status.
   asylo::StatusOr<std::string> MakeRpc(const std::string &input_word) {
     std::unique_ptr<TranslatorClient> client;
-    ASYLO_ASSIGN_OR_RETURN(
-        client, TranslatorClient::Create(absl::StrCat("[::1]:", server_port_)));
+    ASYLO_ASSIGN_OR_RETURN(client, TranslatorClient::Create(absl::StrCat(
+                                       "localhost:", server_port_)));
     return client->GrpcGetTranslation(input_word);
   }
 

asylo/examples/grpc_server/grpc_server_util.cc

@@ -31,7 +31,7 @@ namespace examples {
 namespace grpc_server {
 namespace {
 
-constexpr char kServerAddress[] = "[::1]";
+constexpr char kServerAddress[] = "localhost";
 constexpr char kEnclaveName[] = "grpc_server";
 
 }  // namespace

asylo/examples/secure_grpc/grpc_client_main.cc

@@ -27,7 +27,7 @@
 #include "asylo/util/logging.h"
 #include "asylo/util/status.h"
 
-constexpr char kServerAddress[] = "[::1]";
+constexpr char kServerAddress[] = "localhost";
 
 ABSL_FLAG(std::string, enclave_path, "", "Path to enclave to load");
 ABSL_FLAG(int32_t, port, 0, "Port that the server listens to");

asylo/examples/secure_grpc/grpc_server_util.cc

@@ -36,7 +36,7 @@ namespace examples {
 namespace secure_grpc {
 namespace {
 
-constexpr char kServerAddress[] = "[::1]";
+constexpr char kServerAddress[] = "localhost";
 constexpr char kEnclaveName[] = "secure_grpc_server";
 
 }  // namespace

asylo/examples/secure_grpc/secure_grpc_test.cc

@@ -111,8 +111,8 @@ class GrpcServerTest : public ::testing::Test {
   // the same grpc::Status as the stub function call. If the RPC is successful,
   // returns the translated word, else returns a non-OK status.
   asylo::StatusOr<std::string> MakeRpc(const std::string &input_word) {
-    return GrpcClientEnclaveGetTranslation(absl::StrCat("[::1]:", server_port_),
-                                           input_word);
+    return GrpcClientEnclaveGetTranslation(
+        absl::StrCat("localhost:", server_port_), input_word);
   }
 
  private: