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[glib-networking/wip/pwithnall/dtls: 5/12] tests: Add unit tests for DTLS support

commit 63b88738090baf792d027e68a377f89ba0b540dd
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Fri Jul 10 16:09:33 2015 +0100

    tests: Add unit tests for DTLS support
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697908

 .gitignore                  |    1 +
 tls/tests/Makefile.am       |    4 +
 tls/tests/dtls-connection.c |  505 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 510 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 6977528..da9d288 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,6 +45,7 @@ proxy/tests/libproxy
 /tls/tests/certificate
 /tls/tests/file-database
 /tls/tests/connection
+/tls/tests/dtls-connection
 /tls/tests/pkcs11
 /tls/tests/pkcs11-array
 /tls/tests/pkcs11-pin
diff --git a/tls/tests/Makefile.am b/tls/tests/Makefile.am
index 55e5032..f3bdb79 100644
--- a/tls/tests/Makefile.am
+++ b/tls/tests/Makefile.am
@@ -15,11 +15,15 @@ test_programs =       \
        certificate   \
        file-database \
        connection    \
+       dtls-connection \
        $(NULL)
 
 connection_SOURCES = connection.c \
        mock-interaction.c mock-interaction.h
 
+dtls_connection_SOURCES = dtls-connection.c \
+       mock-interaction.c mock-interaction.h
+
 if HAVE_PKCS11
 
 test_programs +=           \
diff --git a/tls/tests/dtls-connection.c b/tls/tests/dtls-connection.c
new file mode 100644
index 0000000..6549de2
--- /dev/null
+++ b/tls/tests/dtls-connection.c
@@ -0,0 +1,505 @@
+/* GIO TLS tests
+ *
+ * Copyright 2011, 2015 Collabora, Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * In addition, when the library is used with OpenSSL, a special
+ * exception applies. Refer to the LICENSE_EXCEPTION file for details.
+ *
+ * Author: Stef Walter <stefw collabora co uk>
+ *         Philip Withnall <philip withnall collabora co uk>
+ */
+
+#include "config.h"
+
+#include "mock-interaction.h"
+
+#include <gio/gio.h>
+#include <gnutls/gnutls.h>
+
+#include <sys/types.h>
+#include <string.h>
+
+static const gchar *
+tls_test_file_path (const char *name)
+{
+  const gchar *const_path;
+  gchar *path;
+
+  path = g_test_build_filename (G_TEST_DIST, "files", name, NULL);
+  if (!g_path_is_absolute (path))
+    {
+      gchar *cwd, *abs;
+
+      cwd = g_get_current_dir ();
+      abs = g_build_filename (cwd, path, NULL);
+      g_free (cwd);
+      g_free (path);
+      path = abs;
+    }
+
+  const_path = g_intern_string (path);
+  g_free (path);
+  return const_path;
+}
+
+#define TEST_DATA "You win again, gravity!\n"
+#define TEST_DATA_LENGTH 24
+
+typedef struct {
+  GMainContext *context;
+  gboolean loop_finished;
+  GSocket *server_socket;
+  GSource *server_source;
+  GTlsDatabase *database;
+  GDatagramBased *server_connection;
+  GDatagramBased *client_connection;
+  GSocketConnectable *identity;
+  GSocketAddress *address;
+  GTlsAuthenticationMode auth_mode;
+  gboolean rehandshake;
+  GTlsCertificateFlags accept_flags;
+  GError *read_error;
+  gboolean expect_server_error;
+  GError *server_error;
+  gboolean server_should_close;
+  gboolean server_running;
+
+  char buf[128];
+  gssize nread, nwrote;
+} TestConnection;
+
+static void
+setup_connection (TestConnection *test, gconstpointer data)
+{
+  test->context = g_main_context_default ();
+  test->loop_finished = FALSE;
+  test->auth_mode = G_TLS_AUTHENTICATION_NONE;
+}
+
+/* Waits about 10 seconds for @var to be NULL/FALSE */
+#define WAIT_UNTIL_UNSET(var)                          \
+  if (var)                                             \
+    {                                                  \
+      int i;                                           \
+                                                       \
+      for (i = 0; i < 13 && (var); i++)                        \
+       {                                               \
+         g_usleep (1000 * (1 << i));                   \
+         g_main_context_iteration (NULL, FALSE);       \
+       }                                               \
+                                                       \
+      g_assert (!(var));                               \
+    }
+
+static void
+teardown_connection (TestConnection *test, gconstpointer data)
+{
+  GError *error = NULL;
+
+  if (test->server_source)
+    {
+      g_source_destroy (test->server_source);
+      g_source_unref (test->server_source);
+      test->server_source = NULL;
+    }
+
+  if (test->server_connection)
+    {
+      WAIT_UNTIL_UNSET (test->server_running);
+
+      g_object_add_weak_pointer (G_OBJECT (test->server_connection),
+                                (gpointer *)&test->server_connection);
+      g_object_unref (test->server_connection);
+      WAIT_UNTIL_UNSET (test->server_connection);
+    }
+
+  if (test->server_socket)
+    {
+      g_socket_close (test->server_socket, &error);
+      g_assert_no_error (error);
+
+      /* The outstanding accept_async will hold a ref on test->server_socket,
+       * which we want to wait for it to release if we're valgrinding.
+       */
+      g_object_add_weak_pointer (G_OBJECT (test->server_socket), (gpointer *)&test->server_socket);
+      g_object_unref (test->server_socket);
+      WAIT_UNTIL_UNSET (test->server_socket);
+    }
+
+  if (test->client_connection)
+    {
+      g_object_add_weak_pointer (G_OBJECT (test->client_connection),
+                                (gpointer *)&test->client_connection);
+      g_object_unref (test->client_connection);
+      WAIT_UNTIL_UNSET (test->client_connection);
+    }
+
+  if (test->database)
+    {
+      g_object_add_weak_pointer (G_OBJECT (test->database),
+                                (gpointer *)&test->database);
+      g_object_unref (test->database);
+      WAIT_UNTIL_UNSET (test->database);
+    }
+
+  g_clear_object (&test->address);
+  g_clear_object (&test->identity);
+  g_clear_error (&test->read_error);
+  g_clear_error (&test->server_error);
+}
+
+static void
+start_server (TestConnection *test)
+{
+  GInetAddress *inet;
+  GSocketAddress *addr;
+  GInetSocketAddress *iaddr;
+  GSocket *socket = NULL;
+  GError *error = NULL;
+
+  inet = g_inet_address_new_from_string ("127.0.0.1");
+  addr = g_inet_socket_address_new (inet, 0);
+  g_object_unref (inet);
+
+  socket = g_socket_new (G_SOCKET_FAMILY_IPV4, G_SOCKET_TYPE_DATAGRAM,
+                         G_SOCKET_PROTOCOL_UDP, &error);
+  g_assert_no_error (error);
+
+  g_socket_bind (socket, addr, FALSE, &error);
+  g_assert_no_error (error);
+
+  test->address = g_socket_get_local_address (socket, &error);
+  g_assert_no_error (error);
+
+  g_object_unref (addr);
+
+  /* The hostname in test->identity matches the server certificate. */
+  iaddr = G_INET_SOCKET_ADDRESS (test->address);
+  test->identity = g_network_address_new ("server.example.com",
+                                         g_inet_socket_address_get_port (iaddr));
+
+  test->server_socket = socket;
+  test->server_running = TRUE;
+}
+
+static gboolean
+on_accept_certificate (GTlsClientConnection *conn, GTlsCertificate *cert,
+                       GTlsCertificateFlags errors, gpointer user_data)
+{
+  TestConnection *test = user_data;
+  return errors == test->accept_flags;
+}
+
+static void
+close_server_connection (TestConnection *test);
+
+static void
+on_rehandshake_finish (GObject        *object,
+                      GAsyncResult   *res,
+                      gpointer        user_data)
+{
+  TestConnection *test = user_data;
+  GError *error = NULL;
+  GOutputVector vector = {
+    TEST_DATA + TEST_DATA_LENGTH / 2,
+    TEST_DATA_LENGTH / 2
+  };
+  GOutputMessage message = { NULL, &vector, 1, 0, NULL, 0 };
+  gint n_sent;
+
+  g_dtls_connection_handshake_finish (G_DTLS_CONNECTION (object), res, &error);
+  g_assert_no_error (error);
+
+  do
+    {
+      g_clear_error (&test->server_error);
+      n_sent = g_datagram_based_send_messages (test->server_connection,
+                                               &message, 1,
+                                               G_SOCKET_MSG_NONE, FALSE, NULL,
+                                               &test->server_error);
+      g_main_context_iteration (NULL, FALSE);
+    }
+  while (g_error_matches (test->server_error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK));
+
+  if (!test->server_error)
+    {
+      g_assert_cmpint (n_sent, ==, 1);
+      g_assert_cmpuint (message.bytes_sent, ==, TEST_DATA_LENGTH / 2);
+    }
+
+  if (!test->server_error && test->rehandshake)
+    {
+      test->rehandshake = FALSE;
+      g_dtls_connection_handshake_async (G_DTLS_CONNECTION (test->server_connection),
+                                         G_PRIORITY_DEFAULT, NULL,
+                                         on_rehandshake_finish, test);
+      return;
+    }
+
+  if (test->server_should_close)
+    close_server_connection (test);
+}
+
+static void
+close_server_connection (TestConnection *test)
+{
+  GError *error = NULL;
+
+  g_dtls_connection_close (G_DTLS_CONNECTION (test->server_connection),
+                           NULL, &error);
+
+  if (test->expect_server_error)
+    g_assert (error != NULL);
+  else
+    g_assert_no_error (error);
+  test->server_running = FALSE;
+}
+
+static gboolean
+on_incoming_connection (GSocket       *socket,
+                        GIOCondition   condition,
+                        gpointer       user_data)
+{
+  TestConnection *test = user_data;
+  GTlsCertificate *cert;
+  GError *error = NULL;
+  GOutputVector vector = {
+    TEST_DATA,
+    test->rehandshake ? TEST_DATA_LENGTH / 2 : TEST_DATA_LENGTH
+  };
+  GOutputMessage message = { NULL, &vector, 1, 0, NULL, 0 };
+  gint n_sent;
+  GSocketAddress *addr = NULL;  /* owned */
+  guint8 databuf[65536];
+  GInputVector vec = {databuf, sizeof (databuf)};
+  gint flags = G_SOCKET_MSG_PEEK;
+  gssize ret;
+
+  /* Ignore this if the source has already been destroyed. */
+  if (g_source_is_destroyed (test->server_source))
+    return G_SOURCE_REMOVE;
+
+  /* Remove the source as the first thing. */
+  g_source_destroy (test->server_source);
+  g_source_unref (test->server_source);
+  test->server_source = NULL;
+
+  /* Peek at the incoming packet to get the peer’s address. */
+  ret = g_socket_receive_message (socket, &addr, &vec, 1, NULL, NULL,
+                                  &flags, NULL, NULL);
+
+  if (ret <= 0)
+    return G_SOURCE_REMOVE;
+
+  if (!g_socket_connect (socket, addr, NULL, NULL))
+    {
+      g_object_unref (addr);
+      return G_SOURCE_CONTINUE;
+    }
+
+  g_clear_object (&addr);
+
+  /* Wrap the socket in a GDtlsServerConnection. */
+  cert = g_tls_certificate_new_from_file (tls_test_file_path ("server-and-key.pem"), &error);
+  g_assert_no_error (error);
+
+  test->server_connection = g_dtls_server_connection_new (G_DATAGRAM_BASED (socket),
+                                                          cert, &error);
+  g_debug ("%s: Server connection %p on socket %p", G_STRFUNC, test->server_connection, socket);
+  g_assert_no_error (error);
+  g_object_unref (cert);
+
+  g_object_set (test->server_connection, "authentication-mode", test->auth_mode, NULL);
+  g_signal_connect (test->server_connection, "accept-certificate",
+                    G_CALLBACK (on_accept_certificate), test);
+
+  if (test->database)
+    g_dtls_connection_set_database (G_DTLS_CONNECTION (test->server_connection), test->database);
+
+  do
+    {
+      g_clear_error (&test->server_error);
+      n_sent = g_datagram_based_send_messages (test->server_connection,
+                                               &message, 1,
+                                               G_SOCKET_MSG_NONE, FALSE, NULL,
+                                               &test->server_error);
+      g_main_context_iteration (NULL, FALSE);
+    }
+  while (g_error_matches (test->server_error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK));
+
+  if (!test->server_error)
+    {
+      g_assert_cmpint (n_sent, ==, 1);
+      g_assert_cmpuint (message.bytes_sent, ==, vector.size);
+    }
+
+  if (!test->server_error && test->rehandshake)
+    {
+      test->rehandshake = FALSE;
+      g_dtls_connection_handshake_async (G_DTLS_CONNECTION (test->server_connection),
+                                         G_PRIORITY_DEFAULT, NULL,
+                                         on_rehandshake_finish, test);
+      return G_SOURCE_REMOVE;
+    }
+
+  if (test->server_should_close)
+    close_server_connection (test);
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+start_async_server_service (TestConnection *test, GTlsAuthenticationMode auth_mode,
+                            gboolean should_close)
+{
+  start_server (test);
+
+  test->auth_mode = auth_mode;
+  test->server_source = g_socket_create_source (test->server_socket, G_IO_IN,
+                                                NULL);
+  g_source_set_callback (test->server_source,
+                         (GSourceFunc) on_incoming_connection, test, NULL);
+  g_source_attach (test->server_source, NULL);
+
+  test->server_should_close = should_close;
+}
+
+static GDatagramBased *
+start_async_server_and_connect_to_it (TestConnection *test,
+                                      GTlsAuthenticationMode auth_mode,
+                                      gboolean should_close)
+{
+  GError *error = NULL;
+  GSocket *socket;
+
+  start_async_server_service (test, auth_mode, should_close);
+
+  socket = g_socket_new (G_SOCKET_FAMILY_IPV4, G_SOCKET_TYPE_DATAGRAM,
+                         G_SOCKET_PROTOCOL_UDP, &error);
+  g_assert_no_error (error);
+
+  g_socket_connect (socket, test->address, NULL, &error);
+  g_assert_no_error (error);
+
+  return G_DATAGRAM_BASED (socket);
+}
+
+static void
+read_test_data_async (TestConnection *test)
+{
+  gchar *check;
+  GError *error = NULL;
+  guint8 buf[TEST_DATA_LENGTH * 2];
+  GInputVector vector = { &buf, sizeof (buf) };
+  GInputMessage message = { NULL, &vector, 1, 0, 0, NULL, NULL };
+  gint n_read;
+
+  do
+    {
+      g_clear_error (&test->read_error);
+      n_read = g_datagram_based_receive_messages (test->client_connection,
+                                                  &message, 1,
+                                                  G_SOCKET_MSG_NONE, FALSE,
+                                                  NULL, &test->read_error);
+      g_main_context_iteration (NULL, FALSE);
+    }
+  while (g_error_matches (test->read_error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK));
+
+  if (!test->read_error)
+    {
+      g_assert_cmpint (n_read, ==, 1);
+
+      check = g_strdup (TEST_DATA);
+      g_assert_cmpuint (strlen (check), ==, message.bytes_received);
+      g_assert (strncmp (check, (const char *) buf, message.bytes_received) == 0);
+      g_free (check);
+    }
+
+  g_dtls_connection_close (G_DTLS_CONNECTION (test->client_connection),
+                           NULL, &error);
+  g_assert_no_error (error);
+
+  test->loop_finished = TRUE;
+}
+
+static void
+test_basic_connection (TestConnection *test,
+                       gconstpointer   data)
+{
+  GDatagramBased *connection;
+  GError *error = NULL;
+
+  connection = start_async_server_and_connect_to_it (test, G_TLS_AUTHENTICATION_NONE, TRUE);
+  test->client_connection = g_dtls_client_connection_new (connection, test->identity, &error);
+  g_debug ("%s: Client connection %p on socket %p", G_STRFUNC, test->client_connection, connection);
+  g_assert_no_error (error);
+  g_object_unref (connection);
+
+  /* No validation at all in this test */
+  g_dtls_client_connection_set_validation_flags (G_DTLS_CLIENT_CONNECTION (test->client_connection),
+                                                 0);
+
+  read_test_data_async (test);
+  while (!test->loop_finished)
+    g_main_context_iteration (test->context, TRUE);
+
+  g_assert_no_error (test->server_error);
+  g_assert_no_error (test->read_error);
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  int ret;
+  int i;
+
+  /* Check if this is a subprocess, and set G_TLS_GNUTLS_PRIORITY
+   * appropriately if so.
+   */
+  for (i = 1; i < argc - 1; i++)
+    {
+      if (!strcmp (argv[i], "-p"))
+       {
+         const char *priority = argv[i + 1];
+
+         priority = strrchr (priority, '/');
+         if (priority++ &&
+             (g_str_has_prefix (priority, "NORMAL:") ||
+              g_str_has_prefix (priority, "NONE:")))
+           g_setenv ("G_TLS_GNUTLS_PRIORITY", priority, TRUE);
+         break;
+       }
+    }
+
+  g_test_init (&argc, &argv, NULL);
+  g_test_bug_base ("http://bugzilla.gnome.org/";);
+
+  g_setenv ("GSETTINGS_BACKEND", "memory", TRUE);
+  g_setenv ("GIO_EXTRA_MODULES", TOP_BUILDDIR "/tls/gnutls/.libs", TRUE);
+  g_setenv ("GIO_USE_TLS", "gnutls", TRUE);
+
+  g_test_add ("/dtls/connection/basic", TestConnection, NULL,
+              setup_connection, test_basic_connection, teardown_connection);
+
+  ret = g_test_run();
+
+  /* for valgrinding */
+  g_main_context_unref (g_main_context_default ());
+
+  return ret;
+}
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