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- /*
- This file is part of GNUnet
- Copyright (C) 2008--2013 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet 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
- Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file testbed/test_testbed_api_3peers_3controllers.c
- * @brief testcases for the testbed api: 3 peers are configured, started and
- * connected together. Each peer resides on its own controller.
- * @author Sree Harsha Totakura
- */
- /**
- * The testing architecture is:
- * A
- * / \
- * / \
- * B === C
- * A is the master controller and B, C are slave controllers. B links to C
- * laterally.
- * Peers are mapped to controllers in the following relations:
- * Peer Controller
- * 1 A
- * 2 B
- * 3 C
- *
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_testing_lib.h"
- #include "gnunet_testbed_service.h"
- /**
- * Generic logging shortcut
- */
- #define LOG(kind,...) \
- GNUNET_log (kind, __VA_ARGS__)
- /**
- * Relative time seconds shorthand
- */
- #define TIME_REL_SECS(sec) \
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, sec)
- /**
- * Peer context
- */
- struct PeerContext
- {
- /**
- * The peer handle
- */
- struct GNUNET_TESTBED_Peer *peer;
- /**
- * Operations involving this peer
- */
- struct GNUNET_TESTBED_Operation *operation;
- /**
- * set to GNUNET_YES when peer is started
- */
- int is_running;
- };
- /**
- * Our localhost
- */
- static struct GNUNET_TESTBED_Host *host;
- /**
- * The controller process of one controller
- */
- static struct GNUNET_TESTBED_ControllerProc *cp1;
- /**
- * A neighbouring host
- */
- static struct GNUNET_TESTBED_Host *neighbour1;
- /**
- * Another neighbouring host
- */
- static struct GNUNET_TESTBED_Host *neighbour2;
- /**
- * Handle for neighbour registration
- */
- static struct GNUNET_TESTBED_HostRegistrationHandle *reg_handle;
- /**
- * The controller handle of one controller
- */
- static struct GNUNET_TESTBED_Controller *controller1;
- /**
- * peer 1
- */
- static struct PeerContext peer1;
- /**
- * peer2
- */
- static struct PeerContext peer2;
- /**
- * peer3
- */
- static struct PeerContext peer3;
- /**
- * Handle to starting configuration
- */
- static struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Handle to slave controller C's configuration, used to establish lateral link from
- * master controller
- */
- static struct GNUNET_CONFIGURATION_Handle *cfg2;
- /**
- * Handle to operations involving both peers
- */
- static struct GNUNET_TESTBED_Operation *common_operation;
- /**
- * The handle for whether a host is habitable or not
- */
- struct GNUNET_TESTBED_HostHabitableCheckHandle *hc_handle;
- /**
- * Abort task identifier
- */
- static struct GNUNET_SCHEDULER_Task * abort_task;
- /**
- * Delayed connect job identifier
- */
- static struct GNUNET_SCHEDULER_Task * delayed_connect_task;
- /**
- * Different stages in testing
- */
- enum Stage
- {
- /**
- * Initial stage
- */
- INIT,
- /**
- * Controller 1 has started
- */
- CONTROLLER1_UP,
- /**
- * peer1 is created
- */
- PEER1_CREATED,
- /**
- * peer1 is started
- */
- PEER1_STARTED,
- /**
- * Controller 2 has started
- */
- CONTROLLER2_UP,
- /**
- * peer2 is created
- */
- PEER2_CREATED,
- /**
- * peer2 is started
- */
- PEER2_STARTED,
- /**
- * Controller 3 has started
- */
- CONTROLLER3_UP,
- /**
- * Peer3 is created
- */
- PEER3_CREATED,
- /**
- * Peer3 started
- */
- PEER3_STARTED,
- /**
- * peer1 and peer2 are connected
- */
- PEERS_1_2_CONNECTED,
- /**
- * peer2 and peer3 are connected
- */
- PEERS_2_3_CONNECTED,
- /**
- * Peers are connected once again (this should not fail as they are already connected)
- */
- PEERS_CONNECTED_2,
- /**
- * peers are stopped
- */
- PEERS_STOPPED,
- /**
- * Final success stage
- */
- SUCCESS,
- /**
- * Optional stage for marking test to be skipped
- */
- SKIP
- };
- /**
- * The testing result
- */
- static enum Stage result;
- /**
- * Shutdown nicely
- *
- * @param cls NULL
- */
- static void
- do_shutdown (void *cls)
- {
- if (NULL != abort_task)
- GNUNET_SCHEDULER_cancel (abort_task);
- if (NULL != hc_handle)
- GNUNET_TESTBED_is_host_habitable_cancel (hc_handle);
- GNUNET_assert (NULL == delayed_connect_task);
- if (NULL != common_operation)
- GNUNET_TESTBED_operation_done (common_operation);
- if (NULL != reg_handle)
- GNUNET_TESTBED_cancel_registration (reg_handle);
- if (NULL != controller1)
- GNUNET_TESTBED_controller_disconnect (controller1);
- GNUNET_CONFIGURATION_destroy (cfg);
- if (NULL != cfg2)
- GNUNET_CONFIGURATION_destroy (cfg2);
- if (NULL != cp1)
- GNUNET_TESTBED_controller_stop (cp1);
- if (NULL != host)
- GNUNET_TESTBED_host_destroy (host);
- if (NULL != neighbour1)
- GNUNET_TESTBED_host_destroy (neighbour1);
- if (NULL != neighbour2)
- GNUNET_TESTBED_host_destroy (neighbour2);
- }
- /**
- * abort task to run on test timed out
- *
- * @param cls NULL
- */
- static void
- do_abort (void *cls)
- {
- LOG (GNUNET_ERROR_TYPE_WARNING, "Test timedout -- Aborting\n");
- abort_task = NULL;
- if (NULL != delayed_connect_task)
- {
- GNUNET_SCHEDULER_cancel (delayed_connect_task);
- delayed_connect_task = NULL;
- }
- do_shutdown (cls);
- }
- static void
- abort_test ()
- {
- if (NULL != abort_task)
- GNUNET_SCHEDULER_cancel (abort_task);
- abort_task = GNUNET_SCHEDULER_add_now (&do_abort, NULL);
- }
- /**
- * Callback to be called when an operation is completed
- *
- * @param cls the callback closure from functions generating an operation
- * @param op the operation that has been finished
- * @param emsg error message in case the operation has failed; will be NULL if
- * operation has executed successfully.
- */
- static void
- op_comp_cb (void *cls, struct GNUNET_TESTBED_Operation *op, const char *emsg);
- /**
- * task for delaying a connect
- *
- * @param cls NULL
- */
- static void
- do_delayed_connect (void *cls)
- {
- delayed_connect_task = NULL;
- if (NULL != common_operation)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- common_operation =
- GNUNET_TESTBED_overlay_connect (NULL, &op_comp_cb, NULL, peer1.peer,
- peer2.peer);
- }
- /**
- * Callback to be called when an operation is completed
- *
- * @param cls the callback closure from functions generating an operation
- * @param op the operation that has been finished
- * @param emsg error message in case the operation has failed; will be NULL if
- * operation has executed successfully.
- */
- static void
- op_comp_cb (void *cls, struct GNUNET_TESTBED_Operation *op, const char *emsg)
- {
- if (common_operation != op)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- switch (result)
- {
- case PEER3_STARTED:
- case PEERS_2_3_CONNECTED:
- case PEERS_1_2_CONNECTED:
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- if ((NULL != peer1.operation) || (NULL != peer2.operation) ||
- (NULL != peer3.operation))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- }
- /**
- * Functions of this signature are called when a peer has been successfully
- * created
- *
- * @param cls NULL
- * @param peer the handle for the created peer; NULL on any error during
- * creation
- * @param emsg NULL if peer is not NULL; else MAY contain the error description
- */
- static void
- peer_create_cb (void *cls, struct GNUNET_TESTBED_Peer *peer, const char *emsg)
- {
- switch (result)
- {
- case CONTROLLER1_UP:
- if ((NULL == peer1.operation) || (NULL == peer) || (NULL != peer1.peer))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer1.peer = peer;
- GNUNET_TESTBED_operation_done (peer1.operation);
- result = PEER1_CREATED;
- peer1.operation = GNUNET_TESTBED_peer_start (NULL, peer, NULL, NULL);
- break;
- case CONTROLLER2_UP:
- if ((NULL == peer2.operation) || (NULL == peer) || (NULL != peer2.peer))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer2.peer = peer;
- GNUNET_TESTBED_operation_done (peer2.operation);
- result = PEER2_CREATED;
- peer2.operation = GNUNET_TESTBED_peer_start (NULL, peer, NULL, NULL);
- break;
- case CONTROLLER3_UP:
- if ((NULL == peer3.operation) || (NULL == peer) || (NULL != peer3.peer))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer3.peer = peer;
- GNUNET_TESTBED_operation_done (peer3.operation);
- result = PEER3_CREATED;
- peer3.operation = GNUNET_TESTBED_peer_start (NULL, peer, NULL, NULL);
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- }
- /**
- * Signature of the event handler function called by the
- * respective event controller.
- *
- * @param cls closure
- * @param event information about the event
- */
- static void
- controller_cb (void *cls, const struct GNUNET_TESTBED_EventInformation *event)
- {
- switch (event->type)
- {
- case GNUNET_TESTBED_ET_OPERATION_FINISHED:
- if ((NULL != event->op_cls) ||
- (NULL != event->details.operation_finished.emsg))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- switch (result)
- {
- case PEERS_STOPPED:
- if (NULL != event->details.operation_finished.generic)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- if (event->op == peer1.operation)
- {
- GNUNET_TESTBED_operation_done (peer1.operation);
- peer1.operation = NULL;
- peer1.peer = NULL;
- }
- else if (event->op == peer2.operation)
- {
- GNUNET_TESTBED_operation_done (peer2.operation);
- peer2.operation = NULL;
- peer2.peer = NULL;
- }
- else if (event->op == peer3.operation)
- {
- GNUNET_TESTBED_operation_done (peer3.operation);
- peer3.operation = NULL;
- peer3.peer = NULL;
- }
- else
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- if ((NULL == peer1.peer) && (NULL == peer2.peer) && (NULL == peer3.peer))
- {
- result = SUCCESS;
- GNUNET_SCHEDULER_add_now (&do_shutdown, NULL);
- }
- break;
- case PEER1_STARTED:
- if ((NULL != event->details.operation_finished.generic) ||
- (NULL == common_operation))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- GNUNET_TESTBED_operation_done (common_operation);
- common_operation = NULL;
- result = CONTROLLER2_UP;
- peer2.operation =
- GNUNET_TESTBED_peer_create (controller1, neighbour1, cfg,
- &peer_create_cb, NULL);
- if (NULL == peer2.operation)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- case PEER2_STARTED:
- if ((NULL != event->details.operation_finished.generic) ||
- (NULL == common_operation))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- GNUNET_TESTBED_operation_done (common_operation);
- common_operation = NULL;
- result = CONTROLLER3_UP;
- peer3.operation =
- GNUNET_TESTBED_peer_create (controller1, neighbour2, cfg,
- &peer_create_cb, NULL);
- if (NULL == peer3.operation)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- case GNUNET_TESTBED_ET_PEER_START:
- switch (result)
- {
- case PEER1_CREATED:
- if (event->details.peer_start.host != host)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer1.is_running = GNUNET_YES;
- GNUNET_TESTBED_operation_done (peer1.operation);
- peer1.operation = NULL;
- result = PEER1_STARTED;
- common_operation =
- GNUNET_TESTBED_controller_link (NULL, controller1, neighbour1, NULL,
- GNUNET_YES);
- break;
- case PEER2_CREATED:
- if (event->details.peer_start.host != neighbour1)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer2.is_running = GNUNET_YES;
- GNUNET_TESTBED_operation_done (peer2.operation);
- peer2.operation = NULL;
- result = PEER2_STARTED;
- if (NULL != common_operation)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- common_operation =
- GNUNET_TESTBED_controller_link (NULL, controller1, neighbour2, NULL,
- GNUNET_YES);
- if (NULL == common_operation)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- case PEER3_CREATED:
- if (event->details.peer_start.host != neighbour2)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer3.is_running = GNUNET_YES;
- GNUNET_TESTBED_operation_done (peer3.operation);
- peer3.operation = NULL;
- result = PEER3_STARTED;
- common_operation =
- GNUNET_TESTBED_overlay_connect (NULL, &op_comp_cb, NULL, peer2.peer,
- peer1.peer);
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- case GNUNET_TESTBED_ET_PEER_STOP:
- if (PEERS_CONNECTED_2 != result)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- if (event->details.peer_stop.peer == peer1.peer)
- {
- peer1.is_running = GNUNET_NO;
- GNUNET_TESTBED_operation_done (peer1.operation);
- }
- else if (event->details.peer_stop.peer == peer2.peer)
- {
- peer2.is_running = GNUNET_NO;
- GNUNET_TESTBED_operation_done (peer2.operation);
- }
- else if (event->details.peer_stop.peer == peer3.peer)
- {
- peer3.is_running = GNUNET_NO;
- GNUNET_TESTBED_operation_done (peer3.operation);
- }
- else
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- if ((GNUNET_NO == peer1.is_running) && (GNUNET_NO == peer2.is_running) &&
- (GNUNET_NO == peer3.is_running))
- {
- result = PEERS_STOPPED;
- peer1.operation = GNUNET_TESTBED_peer_destroy (peer1.peer);
- peer2.operation = GNUNET_TESTBED_peer_destroy (peer2.peer);
- peer3.operation = GNUNET_TESTBED_peer_destroy (peer3.peer);
- }
- break;
- case GNUNET_TESTBED_ET_CONNECT:
- if ((NULL != peer1.operation) || (NULL != peer2.operation) ||
- (NULL != peer3.operation) || (NULL == common_operation))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- switch (result)
- {
- case PEER3_STARTED:
- if ((event->details.peer_connect.peer1 != peer2.peer) ||
- (event->details.peer_connect.peer2 != peer1.peer))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- GNUNET_TESTBED_operation_done (common_operation);
- common_operation = NULL;
- result = PEERS_1_2_CONNECTED;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Peers connected\n");
- common_operation =
- GNUNET_TESTBED_overlay_connect (NULL, &op_comp_cb, NULL, peer2.peer,
- peer3.peer);
- break;
- case PEERS_1_2_CONNECTED:
- if ((event->details.peer_connect.peer1 != peer2.peer) ||
- (event->details.peer_connect.peer2 != peer3.peer))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- GNUNET_TESTBED_operation_done (common_operation);
- common_operation = NULL;
- result = PEERS_2_3_CONNECTED;
- delayed_connect_task =
- GNUNET_SCHEDULER_add_delayed (TIME_REL_SECS (3), &do_delayed_connect,
- NULL);
- break;
- case PEERS_2_3_CONNECTED:
- if ((event->details.peer_connect.peer1 != peer1.peer) ||
- (event->details.peer_connect.peer2 != peer2.peer))
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- GNUNET_TESTBED_operation_done (common_operation);
- common_operation = NULL;
- result = PEERS_CONNECTED_2;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Peers connected again\n");
- peer1.operation = GNUNET_TESTBED_peer_stop (NULL, peer1.peer, NULL, NULL);
- peer2.operation = GNUNET_TESTBED_peer_stop (NULL, peer2.peer, NULL, NULL);
- peer3.operation = GNUNET_TESTBED_peer_stop (NULL, peer3.peer, NULL, NULL);
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- }
- /**
- * Callback which will be called to after a host registration succeeded or failed
- *
- * @param cls the host which has been registered
- * @param emsg the error message; NULL if host registration is successful
- */
- static void
- registration_comp (void *cls, const char *emsg)
- {
- reg_handle = NULL;
- if (cls == neighbour1)
- {
- neighbour2 = GNUNET_TESTBED_host_create ("127.0.0.1", NULL, cfg, 0);
- if (NULL == neighbour2)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- reg_handle =
- GNUNET_TESTBED_register_host (controller1, neighbour2,
- ®istration_comp, neighbour2);
- if (NULL == reg_handle)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- return;
- }
- if (cls != neighbour2)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- peer1.operation =
- GNUNET_TESTBED_peer_create (controller1, host, cfg, &peer_create_cb,
- &peer1);
- if (NULL == peer1.operation)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- }
- /**
- * Callback to signal successfull startup of the controller process
- *
- * @param cls the closure from GNUNET_TESTBED_controller_start()
- * @param cfg the configuration with which the controller has been started;
- * NULL if status is not GNUNET_OK
- * @param status GNUNET_OK if the startup is successfull; GNUNET_SYSERR if not,
- * GNUNET_TESTBED_controller_stop() shouldn't be called in this case
- */
- static void
- status_cb (void *cls, const struct GNUNET_CONFIGURATION_Handle *config,
- int status)
- {
- uint64_t event_mask;
- if (GNUNET_OK != status)
- {
- GNUNET_break (0);
- cp1 = NULL;
- abort_test ();
- return;
- }
- event_mask = 0;
- event_mask |= (1L << GNUNET_TESTBED_ET_PEER_START);
- event_mask |= (1L << GNUNET_TESTBED_ET_PEER_STOP);
- event_mask |= (1L << GNUNET_TESTBED_ET_CONNECT);
- event_mask |= (1L << GNUNET_TESTBED_ET_OPERATION_FINISHED);
- switch (result)
- {
- case INIT:
- controller1 =
- GNUNET_TESTBED_controller_connect (host, event_mask,
- &controller_cb, NULL);
- if (NULL == controller1)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- result = CONTROLLER1_UP;
- neighbour1 = GNUNET_TESTBED_host_create ("127.0.0.1", NULL, cfg, 0);
- if (NULL == neighbour1)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- reg_handle =
- GNUNET_TESTBED_register_host (controller1, neighbour1,
- ®istration_comp, neighbour1);
- if (NULL == reg_handle)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- break;
- default:
- GNUNET_break (0);
- abort_test ();
- return;
- }
- }
- /**
- * Callbacks of this type are called by GNUNET_TESTBED_is_host_habitable to
- * inform whether the given host is habitable or not. The Handle returned by
- * GNUNET_TESTBED_is_host_habitable() is invalid after this callback is called
- *
- * @param cls NULL
- * @param host the host whose status is being reported; will be NULL if the host
- * given to GNUNET_TESTBED_is_host_habitable() is NULL
- * @param status #GNUNET_YES if it is habitable; #GNUNET_NO if not
- */
- static void
- host_habitable_cb (void *cls,
- const struct GNUNET_TESTBED_Host *_host,
- int status)
- {
- hc_handle = NULL;
- if (GNUNET_NO == status)
- {
- (void) PRINTF ("%s",
- "Unable to run the test as this system is not configured "
- "to use password less SSH logins to localhost.\n"
- "Skipping test\n");
- GNUNET_SCHEDULER_cancel (abort_task);
- abort_task = NULL;
- GNUNET_SCHEDULER_add_now (&do_shutdown, NULL);
- result = SKIP;
- return;
- }
- cp1 =
- GNUNET_TESTBED_controller_start ("127.0.0.1", host, status_cb, NULL);
- }
- /**
- * Main run function.
- *
- * @param cls NULL
- * @param args arguments passed to GNUNET_PROGRAM_run
- * @param cfgfile the path to configuration file
- * @param cfg the configuration file handle
- */
- static void
- run (void *cls, char *const *args, const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *config)
- {
- cfg = GNUNET_CONFIGURATION_dup (config);
- host = GNUNET_TESTBED_host_create (NULL, NULL, cfg, 0);
- if (NULL == host)
- {
- GNUNET_break (0);
- abort_test ();
- return;
- }
- if (NULL ==
- (hc_handle =
- GNUNET_TESTBED_is_host_habitable (host, config, &host_habitable_cb,
- NULL)))
- {
- GNUNET_TESTBED_host_destroy (host);
- host = NULL;
- (void) PRINTF ("%s",
- "Unable to run the test as this system is not configured "
- "to use password less SSH logins to localhost.\n"
- "Skipping test\n");
- result = SKIP;
- return;
- }
- abort_task =
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
- (GNUNET_TIME_UNIT_MINUTES, 3), &do_abort,
- NULL);
- }
- /**
- * Main function
- */
- int
- main (int argc, char **argv)
- {
- char *const argv2[] = { "test_testbed_api_3peers_3controllers",
- "-c", "test_testbed_api.conf",
- NULL
- };
- struct GNUNET_GETOPT_CommandLineOption options[] = {
- GNUNET_GETOPT_OPTION_END
- };
- int ret;
- result = INIT;
- ret =
- GNUNET_PROGRAM_run ((sizeof (argv2) / sizeof (char *)) - 1, argv2,
- "test_testbed_api_3peers_3controllers", "nohelp",
- options, &run, NULL);
- if (GNUNET_OK != ret)
- return 1;
- switch (result)
- {
- case SUCCESS:
- return 0;
- case SKIP:
- return 77; /* Mark test as skipped */
- default:
- return 1;
- }
- }
- /* end of test_testbed_api_3peers_3controllers.c */
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