2 This file is part of GNUnet
3 Copyright (C) 2008--2013, 2016 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 * @file testbed/gnunet-helper-testbed.c
21 * @brief Helper binary that is started from a remote controller to start
22 * gnunet-service-testbed. This binary also receives configuration
23 * from the remove controller which is put in a temporary location
24 * with ports and paths fixed so that gnunet-service-testbed runs
25 * without any hurdles.
27 * This helper monitors for three termination events. They are: (1)The
28 * stdin of the helper is closed for reading; (2)the helper received
29 * SIGTERM/SIGINT; (3)the testbed crashed. In case of events 1 and 2
30 * the helper kills the testbed service. When testbed crashed (event
31 * 3), the helper should send a SIGTERM to its own process group; this
32 * behaviour will help terminate any child processes (peers) testbed
33 * has started and prevents them from leaking and running forever.
35 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
40 #include "gnunet_util_lib.h"
41 #include "gnunet_testing_lib.h"
42 #include "gnunet_testbed_service.h"
43 #include "testbed_helper.h"
44 #include "testbed_api.h"
48 * Generic logging shortcut
50 #define LOG(kind, ...) \
51 GNUNET_log (kind, __VA_ARGS__)
54 * Debug logging shorthand
56 #define LOG_DEBUG(...) \
57 LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
61 * We need pipe control only on WINDOWS
64 #define PIPE_CONTROL GNUNET_YES
66 #define PIPE_CONTROL GNUNET_NO
71 * Context for a single write on a chunk of memory
81 * The length of the data
86 * The current position from where the write operation should begin
93 * Handle to the testing system
95 static struct GNUNET_TESTING_System *test_system;
98 * Our message stream tokenizer
100 struct GNUNET_MessageStreamTokenizer *tokenizer;
103 * Disk handle from stdin
105 static struct GNUNET_DISK_FileHandle *stdin_fd;
108 * Disk handle for stdout
110 static struct GNUNET_DISK_FileHandle *stdout_fd;
113 * The process handle to the testbed service
115 static struct GNUNET_OS_Process *testbed;
118 * Pipe used to communicate shutdown via signal.
120 static struct GNUNET_DISK_PipeHandle *sigpipe;
123 * Task identifier for the read task
125 static struct GNUNET_SCHEDULER_Task *read_task_id;
128 * Task identifier for the write task
130 static struct GNUNET_SCHEDULER_Task *write_task_id;
133 * Task to kill the child
135 static struct GNUNET_SCHEDULER_Task *child_death_task_id;
138 * Are we done reading messages from stdin?
140 static int done_reading;
143 * Result to return in case we fail
149 * Task to shut down cleanly
154 shutdown_task (void *cls)
156 LOG_DEBUG ("Shutting down\n");
159 LOG_DEBUG ("Killing testbed\n");
160 GNUNET_break (0 == GNUNET_OS_process_kill (testbed, GNUNET_TERM_SIG));
162 if (NULL != read_task_id)
164 GNUNET_SCHEDULER_cancel (read_task_id);
167 if (NULL != write_task_id)
169 struct WriteContext *wc;
171 wc = GNUNET_SCHEDULER_cancel (write_task_id);
172 write_task_id = NULL;
173 GNUNET_free (wc->data);
176 if (NULL != child_death_task_id)
178 GNUNET_SCHEDULER_cancel (child_death_task_id);
179 child_death_task_id = NULL;
181 if (NULL != stdin_fd)
182 (void) GNUNET_DISK_file_close (stdin_fd);
183 if (NULL != stdout_fd)
184 (void) GNUNET_DISK_file_close (stdout_fd);
185 GNUNET_MST_destroy (tokenizer);
189 GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (testbed));
190 GNUNET_OS_process_destroy (testbed);
193 if (NULL != test_system)
195 GNUNET_TESTING_system_destroy (test_system, GNUNET_YES);
202 * Task to write to the standard out
204 * @param cls the WriteContext
207 write_task (void *cls)
209 struct WriteContext *wc = cls;
212 GNUNET_assert (NULL != wc);
213 write_task_id = NULL;
215 GNUNET_DISK_file_write (stdout_fd, wc->data + wc->pos,
216 wc->length - wc->pos);
217 if (GNUNET_SYSERR == bytes_wrote)
219 LOG (GNUNET_ERROR_TYPE_WARNING,
220 "Cannot reply back configuration\n");
221 GNUNET_free (wc->data);
225 wc->pos += bytes_wrote;
226 if (wc->pos == wc->length)
228 GNUNET_free (wc->data);
233 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
240 * Task triggered whenever we receive a SIGCHLD (child
243 * @param cls closure, NULL if we need to self-restart
246 child_death_task (void *cls)
248 const struct GNUNET_DISK_FileHandle *pr;
250 enum GNUNET_OS_ProcessStatusType type;
254 pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
255 child_death_task_id = NULL;
256 /* consume the signal */
257 GNUNET_break (0 < GNUNET_DISK_file_read (pr, &c, sizeof (c)));
258 LOG_DEBUG ("Got SIGCHLD\n");
264 GNUNET_break (GNUNET_SYSERR !=
265 (ret = GNUNET_OS_process_status (testbed, &type, &code)));
266 if (GNUNET_NO != ret)
268 GNUNET_OS_process_destroy (testbed);
270 /* Send SIGTERM to our process group */
271 if (0 != PLIBC_KILL (0, GNUNET_TERM_SIG))
273 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "signal");
274 GNUNET_SCHEDULER_shutdown (); /* Couldn't send the signal, we shutdown frowning */
278 LOG_DEBUG ("Child hasn't died. Resuming to monitor its status\n");
279 child_death_task_id =
280 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
281 pr, &child_death_task, NULL);
286 * Functions with this signature are called whenever a
287 * complete message is received by the tokenizer.
289 * Do not call #GNUNET_mst_destroy() in this callback
291 * @param cls identification of the client
292 * @param message the actual message
293 * @return #GNUNET_OK on success,
294 * #GNUNET_NO to stop further processing (no error)
295 * #GNUNET_SYSERR to stop further processing with error
298 tokenizer_cb (void *cls,
299 const struct GNUNET_MessageHeader *message)
301 const struct GNUNET_TESTBED_HelperInit *msg;
302 struct GNUNET_TESTBED_HelperReply *reply;
303 struct GNUNET_CONFIGURATION_Handle *cfg;
304 struct WriteContext *wc;
313 uLongf ul_config_size;
315 uint16_t trusted_ip_size;
316 uint16_t hostname_size;
319 msize = ntohs (message->size);
320 if ((sizeof (struct GNUNET_TESTBED_HelperInit) >= msize) ||
321 (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_INIT != ntohs (message->type)))
323 LOG (GNUNET_ERROR_TYPE_WARNING,
324 "Received unexpected message -- exiting\n");
327 msg = (const struct GNUNET_TESTBED_HelperInit *) message;
328 trusted_ip_size = ntohs (msg->trusted_ip_size);
329 trusted_ip = (char *) &msg[1];
330 if ('\0' != trusted_ip[trusted_ip_size])
332 LOG (GNUNET_ERROR_TYPE_WARNING, "Trusted IP cannot be empty -- exiting\n");
335 hostname_size = ntohs (msg->hostname_size);
336 if ((sizeof (struct GNUNET_TESTBED_HelperInit) + trusted_ip_size + 1 +
337 hostname_size) >= msize)
340 LOG (GNUNET_ERROR_TYPE_WARNING, "Received unexpected message -- exiting\n");
343 ul_config_size = (uLongf) ntohs (msg->config_size);
344 config = GNUNET_malloc (ul_config_size);
346 ntohs (message->size) - (trusted_ip_size + 1 +
347 sizeof (struct GNUNET_TESTBED_HelperInit));
349 uncompress ((Bytef *) config, &ul_config_size,
350 (const Bytef *) (trusted_ip + trusted_ip_size + 1 +
351 hostname_size), (uLongf) xconfig_size))
353 LOG (GNUNET_ERROR_TYPE_WARNING,
354 "Error while uncompressing config -- exiting\n");
355 GNUNET_free (config);
358 cfg = GNUNET_CONFIGURATION_create ();
360 GNUNET_CONFIGURATION_deserialize (cfg,
365 LOG (GNUNET_ERROR_TYPE_WARNING,
366 "Unable to deserialize config -- exiting\n");
367 GNUNET_free (config);
370 GNUNET_free (config);
372 if (0 != hostname_size)
374 hostname = GNUNET_malloc (hostname_size + 1);
375 (void) strncpy (hostname, ((char *) &msg[1]) + trusted_ip_size + 1,
377 hostname[hostname_size] = '\0';
379 /* unset GNUNET_TESTING_PREFIX if present as it is more relevant for testbed */
380 evstr = getenv (GNUNET_TESTING_PREFIX);
383 /* unsetting the variable will invalidate the pointer! */
384 evstr = GNUNET_strdup (evstr);
386 GNUNET_break (0 != SetEnvironmentVariable (GNUNET_TESTING_PREFIX, NULL));
388 GNUNET_break (0 == unsetenv (GNUNET_TESTING_PREFIX));
392 GNUNET_TESTING_system_create ("testbed-helper", trusted_ip, hostname,
397 GNUNET_assert (0 != SetEnvironmentVariable (GNUNET_TESTING_PREFIX,
402 GNUNET_asprintf (&evar,
403 GNUNET_TESTING_PREFIX "=%s",
405 GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
406 see putenv(): becomes part of envrionment! */
411 GNUNET_free_non_null (hostname);
413 GNUNET_assert (NULL != test_system);
414 GNUNET_assert (GNUNET_OK ==
415 GNUNET_TESTING_configuration_create (test_system, cfg));
416 GNUNET_assert (GNUNET_OK ==
417 GNUNET_CONFIGURATION_get_value_filename (cfg, "PATHS",
420 if (GNUNET_OK != GNUNET_CONFIGURATION_write (cfg, config))
422 LOG (GNUNET_ERROR_TYPE_WARNING,
423 "Unable to write config file: %s -- exiting\n", config);
424 GNUNET_CONFIGURATION_destroy (cfg);
425 GNUNET_free (config);
428 LOG_DEBUG ("Staring testbed with config: %s\n", config);
429 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-service-testbed");
433 /* expose testbed configuration through env variable */
434 GNUNET_asprintf (&evar,
438 GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
439 see putenv(): becomes part of envrionment! */
443 GNUNET_OS_start_process (PIPE_CONTROL,
444 GNUNET_OS_INHERIT_STD_ERR /*verbose? */ ,
447 "gnunet-service-testbed",
450 GNUNET_free (binary);
451 GNUNET_free (config);
454 LOG (GNUNET_ERROR_TYPE_WARNING,
455 "Error starting gnunet-service-testbed -- exiting\n");
456 GNUNET_CONFIGURATION_destroy (cfg);
459 done_reading = GNUNET_YES;
460 config = GNUNET_CONFIGURATION_serialize (cfg, &config_size);
461 GNUNET_CONFIGURATION_destroy (cfg);
464 GNUNET_TESTBED_compress_config_ (config, config_size, &xconfig);
465 GNUNET_free (config);
466 wc = GNUNET_new (struct WriteContext);
467 wc->length = xconfig_size + sizeof (struct GNUNET_TESTBED_HelperReply);
468 reply = GNUNET_realloc (xconfig, wc->length);
469 memmove (&reply[1], reply, xconfig_size);
470 reply->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_REPLY);
471 reply->header.size = htons ((uint16_t) wc->length);
472 reply->config_size = htons ((uint16_t) config_size);
475 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
478 child_death_task_id =
479 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
480 GNUNET_DISK_pipe_handle (sigpipe,
481 GNUNET_DISK_PIPE_END_READ),
482 &child_death_task, NULL);
486 status = GNUNET_SYSERR;
487 GNUNET_SCHEDULER_shutdown ();
488 return GNUNET_SYSERR;
493 * Task to read from stdin
498 read_task (void *cls)
500 char buf[GNUNET_MAX_MESSAGE_SIZE];
504 sread = GNUNET_DISK_file_read (stdin_fd,
507 if ( (GNUNET_SYSERR == sread) ||
510 LOG_DEBUG ("STDIN closed\n");
511 GNUNET_SCHEDULER_shutdown ();
514 if (GNUNET_YES == done_reading)
516 /* didn't expect any more data! */
518 GNUNET_SCHEDULER_shutdown ();
521 LOG_DEBUG ("Read %u bytes\n",
522 (unsigned int) sread);
523 /* FIXME: could introduce a GNUNET_MST_read2 to read
524 directly from 'stdin_fd' and save a memcpy() here */
526 GNUNET_MST_from_buffer (tokenizer,
533 GNUNET_SCHEDULER_shutdown ();
536 read_task_id /* No timeout while reading */
537 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
545 * Main function that will be run.
548 * @param args remaining command-line arguments
549 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
550 * @param cfg configuration
556 const struct GNUNET_CONFIGURATION_Handle *cfg)
558 LOG_DEBUG ("Starting testbed helper...\n");
559 tokenizer = GNUNET_MST_create (&tokenizer_cb, NULL);
560 stdin_fd = GNUNET_DISK_get_handle_from_native (stdin);
561 stdout_fd = GNUNET_DISK_get_handle_from_native (stdout);
563 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
566 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
572 * Signal handler called for SIGCHLD.
575 sighandler_child_death ()
578 int old_errno; /* back-up errno */
582 GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
583 (sigpipe, GNUNET_DISK_PIPE_END_WRITE),
592 * @param argc the number of command line arguments
593 * @param argv command line arg array
594 * @return return code
600 struct GNUNET_SIGNAL_Context *shc_chld;
601 struct GNUNET_GETOPT_CommandLineOption options[] = {
602 GNUNET_GETOPT_OPTION_END
607 if (NULL == (sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO,
608 GNUNET_NO, GNUNET_NO)))
613 shc_chld = GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD,
614 &sighandler_child_death);
615 ret = GNUNET_PROGRAM_run (argc, argv,
616 "gnunet-helper-testbed",
617 "Helper for starting gnunet-service-testbed",
621 GNUNET_SIGNAL_handler_uninstall (shc_chld);
623 GNUNET_DISK_pipe_close (sigpipe);
624 if (GNUNET_OK != ret)
626 return (GNUNET_OK == status) ? 0 : 1;
629 /* end of gnunet-helper-testbed.c */