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3 Copyright (C) 2008--2013, 2016 GNUnet e.V.
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7 by the Free Software Foundation, either version 3 of the License,
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 Affero General Public License for more details.
17 * @file testbed/gnunet-helper-testbed.c
18 * @brief Helper binary that is started from a remote controller to start
19 * gnunet-service-testbed. This binary also receives configuration
20 * from the remove controller which is put in a temporary location
21 * with ports and paths fixed so that gnunet-service-testbed runs
22 * without any hurdles.
24 * This helper monitors for three termination events. They are: (1)The
25 * stdin of the helper is closed for reading; (2)the helper received
26 * SIGTERM/SIGINT; (3)the testbed crashed. In case of events 1 and 2
27 * the helper kills the testbed service. When testbed crashed (event
28 * 3), the helper should send a SIGTERM to its own process group; this
29 * behaviour will help terminate any child processes (peers) testbed
30 * has started and prevents them from leaking and running forever.
32 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
37 #include "gnunet_util_lib.h"
38 #include "gnunet_testing_lib.h"
39 #include "gnunet_testbed_service.h"
40 #include "testbed_helper.h"
41 #include "testbed_api.h"
45 * Generic logging shortcut
47 #define LOG(kind, ...) \
48 GNUNET_log (kind, __VA_ARGS__)
51 * Debug logging shorthand
53 #define LOG_DEBUG(...) \
54 LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
58 * We need pipe control only on WINDOWS
61 #define PIPE_CONTROL GNUNET_YES
63 #define PIPE_CONTROL GNUNET_NO
68 * Context for a single write on a chunk of memory
78 * The length of the data
83 * The current position from where the write operation should begin
90 * Handle to the testing system
92 static struct GNUNET_TESTING_System *test_system;
95 * Our message stream tokenizer
97 struct GNUNET_MessageStreamTokenizer *tokenizer;
100 * Disk handle from stdin
102 static struct GNUNET_DISK_FileHandle *stdin_fd;
105 * Disk handle for stdout
107 static struct GNUNET_DISK_FileHandle *stdout_fd;
110 * The process handle to the testbed service
112 static struct GNUNET_OS_Process *testbed;
115 * Pipe used to communicate shutdown via signal.
117 static struct GNUNET_DISK_PipeHandle *sigpipe;
120 * Task identifier for the read task
122 static struct GNUNET_SCHEDULER_Task *read_task_id;
125 * Task identifier for the write task
127 static struct GNUNET_SCHEDULER_Task *write_task_id;
130 * Task to kill the child
132 static struct GNUNET_SCHEDULER_Task *child_death_task_id;
135 * Are we done reading messages from stdin?
137 static int done_reading;
140 * Result to return in case we fail
146 * Task to shut down cleanly
151 shutdown_task (void *cls)
153 LOG_DEBUG ("Shutting down\n");
156 LOG_DEBUG ("Killing testbed\n");
157 GNUNET_break (0 == GNUNET_OS_process_kill (testbed, GNUNET_TERM_SIG));
159 if (NULL != read_task_id)
161 GNUNET_SCHEDULER_cancel (read_task_id);
164 if (NULL != write_task_id)
166 struct WriteContext *wc;
168 wc = GNUNET_SCHEDULER_cancel (write_task_id);
169 write_task_id = NULL;
170 GNUNET_free (wc->data);
173 if (NULL != child_death_task_id)
175 GNUNET_SCHEDULER_cancel (child_death_task_id);
176 child_death_task_id = NULL;
178 if (NULL != stdin_fd)
179 (void) GNUNET_DISK_file_close (stdin_fd);
180 if (NULL != stdout_fd)
181 (void) GNUNET_DISK_file_close (stdout_fd);
182 GNUNET_MST_destroy (tokenizer);
186 GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (testbed));
187 GNUNET_OS_process_destroy (testbed);
190 if (NULL != test_system)
192 GNUNET_TESTING_system_destroy (test_system, GNUNET_YES);
199 * Task to write to the standard out
201 * @param cls the WriteContext
204 write_task (void *cls)
206 struct WriteContext *wc = cls;
209 GNUNET_assert (NULL != wc);
210 write_task_id = NULL;
212 GNUNET_DISK_file_write (stdout_fd, wc->data + wc->pos,
213 wc->length - wc->pos);
214 if (GNUNET_SYSERR == bytes_wrote)
216 LOG (GNUNET_ERROR_TYPE_WARNING,
217 "Cannot reply back configuration\n");
218 GNUNET_free (wc->data);
222 wc->pos += bytes_wrote;
223 if (wc->pos == wc->length)
225 GNUNET_free (wc->data);
230 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
237 * Task triggered whenever we receive a SIGCHLD (child
240 * @param cls closure, NULL if we need to self-restart
243 child_death_task (void *cls)
245 const struct GNUNET_DISK_FileHandle *pr;
247 enum GNUNET_OS_ProcessStatusType type;
251 pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
252 child_death_task_id = NULL;
253 /* consume the signal */
254 GNUNET_break (0 < GNUNET_DISK_file_read (pr, &c, sizeof (c)));
255 LOG_DEBUG ("Got SIGCHLD\n");
261 GNUNET_break (GNUNET_SYSERR !=
262 (ret = GNUNET_OS_process_status (testbed, &type, &code)));
263 if (GNUNET_NO != ret)
265 GNUNET_OS_process_destroy (testbed);
267 /* Send SIGTERM to our process group */
268 if (0 != PLIBC_KILL (0, GNUNET_TERM_SIG))
270 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "signal");
271 GNUNET_SCHEDULER_shutdown (); /* Couldn't send the signal, we shutdown frowning */
275 LOG_DEBUG ("Child hasn't died. Resuming to monitor its status\n");
276 child_death_task_id =
277 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
278 pr, &child_death_task, NULL);
283 * Functions with this signature are called whenever a
284 * complete message is received by the tokenizer.
286 * Do not call #GNUNET_mst_destroy() in this callback
288 * @param cls identification of the client
289 * @param message the actual message
290 * @return #GNUNET_OK on success,
291 * #GNUNET_NO to stop further processing (no error)
292 * #GNUNET_SYSERR to stop further processing with error
295 tokenizer_cb (void *cls,
296 const struct GNUNET_MessageHeader *message)
298 const struct GNUNET_TESTBED_HelperInit *msg;
299 struct GNUNET_TESTBED_HelperReply *reply;
300 struct GNUNET_CONFIGURATION_Handle *cfg;
301 struct WriteContext *wc;
310 uLongf ul_config_size;
312 uint16_t trusted_ip_size;
313 uint16_t hostname_size;
316 msize = ntohs (message->size);
317 if ((sizeof (struct GNUNET_TESTBED_HelperInit) >= msize) ||
318 (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_INIT != ntohs (message->type)))
320 LOG (GNUNET_ERROR_TYPE_WARNING,
321 "Received unexpected message -- exiting\n");
324 msg = (const struct GNUNET_TESTBED_HelperInit *) message;
325 trusted_ip_size = ntohs (msg->trusted_ip_size);
326 trusted_ip = (char *) &msg[1];
327 if ('\0' != trusted_ip[trusted_ip_size])
329 LOG (GNUNET_ERROR_TYPE_WARNING, "Trusted IP cannot be empty -- exiting\n");
332 hostname_size = ntohs (msg->hostname_size);
333 if ((sizeof (struct GNUNET_TESTBED_HelperInit) + trusted_ip_size + 1 +
334 hostname_size) >= msize)
337 LOG (GNUNET_ERROR_TYPE_WARNING, "Received unexpected message -- exiting\n");
340 ul_config_size = (uLongf) ntohs (msg->config_size);
341 config = GNUNET_malloc (ul_config_size);
343 ntohs (message->size) - (trusted_ip_size + 1 +
344 sizeof (struct GNUNET_TESTBED_HelperInit));
346 uncompress ((Bytef *) config, &ul_config_size,
347 (const Bytef *) (trusted_ip + trusted_ip_size + 1 +
348 hostname_size), (uLongf) xconfig_size))
350 LOG (GNUNET_ERROR_TYPE_WARNING,
351 "Error while uncompressing config -- exiting\n");
352 GNUNET_free (config);
355 cfg = GNUNET_CONFIGURATION_create ();
357 GNUNET_CONFIGURATION_deserialize (cfg,
362 LOG (GNUNET_ERROR_TYPE_WARNING,
363 "Unable to deserialize config -- exiting\n");
364 GNUNET_free (config);
367 GNUNET_free (config);
369 if (0 != hostname_size)
371 hostname = GNUNET_malloc (hostname_size + 1);
372 (void) strncpy (hostname, ((char *) &msg[1]) + trusted_ip_size + 1,
374 hostname[hostname_size] = '\0';
376 /* unset GNUNET_TESTING_PREFIX if present as it is more relevant for testbed */
377 evstr = getenv (GNUNET_TESTING_PREFIX);
380 /* unsetting the variable will invalidate the pointer! */
381 evstr = GNUNET_strdup (evstr);
383 GNUNET_break (0 != SetEnvironmentVariable (GNUNET_TESTING_PREFIX, NULL));
385 GNUNET_break (0 == unsetenv (GNUNET_TESTING_PREFIX));
389 GNUNET_TESTING_system_create ("testbed-helper", trusted_ip, hostname,
394 GNUNET_assert (0 != SetEnvironmentVariable (GNUNET_TESTING_PREFIX,
399 GNUNET_asprintf (&evar,
400 GNUNET_TESTING_PREFIX "=%s",
402 GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
403 see putenv(): becomes part of envrionment! */
408 GNUNET_free_non_null (hostname);
410 GNUNET_assert (NULL != test_system);
411 GNUNET_assert (GNUNET_OK ==
412 GNUNET_TESTING_configuration_create (test_system, cfg));
413 GNUNET_assert (GNUNET_OK ==
414 GNUNET_CONFIGURATION_get_value_filename (cfg, "PATHS",
417 if (GNUNET_OK != GNUNET_CONFIGURATION_write (cfg, config))
419 LOG (GNUNET_ERROR_TYPE_WARNING,
420 "Unable to write config file: %s -- exiting\n", config);
421 GNUNET_CONFIGURATION_destroy (cfg);
422 GNUNET_free (config);
425 LOG_DEBUG ("Staring testbed with config: %s\n", config);
426 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-service-testbed");
430 /* expose testbed configuration through env variable */
431 GNUNET_asprintf (&evar,
435 GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
436 see putenv(): becomes part of envrionment! */
440 GNUNET_OS_start_process (PIPE_CONTROL,
441 GNUNET_OS_INHERIT_STD_ERR /*verbose? */ ,
444 "gnunet-service-testbed",
447 GNUNET_free (binary);
448 GNUNET_free (config);
451 LOG (GNUNET_ERROR_TYPE_WARNING,
452 "Error starting gnunet-service-testbed -- exiting\n");
453 GNUNET_CONFIGURATION_destroy (cfg);
456 done_reading = GNUNET_YES;
457 config = GNUNET_CONFIGURATION_serialize (cfg, &config_size);
458 GNUNET_CONFIGURATION_destroy (cfg);
461 GNUNET_TESTBED_compress_config_ (config, config_size, &xconfig);
462 GNUNET_free (config);
463 wc = GNUNET_new (struct WriteContext);
464 wc->length = xconfig_size + sizeof (struct GNUNET_TESTBED_HelperReply);
465 reply = GNUNET_realloc (xconfig, wc->length);
466 memmove (&reply[1], reply, xconfig_size);
467 reply->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_REPLY);
468 reply->header.size = htons ((uint16_t) wc->length);
469 reply->config_size = htons ((uint16_t) config_size);
472 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
475 child_death_task_id =
476 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
477 GNUNET_DISK_pipe_handle (sigpipe,
478 GNUNET_DISK_PIPE_END_READ),
479 &child_death_task, NULL);
483 status = GNUNET_SYSERR;
484 GNUNET_SCHEDULER_shutdown ();
485 return GNUNET_SYSERR;
490 * Task to read from stdin
495 read_task (void *cls)
497 char buf[GNUNET_MAX_MESSAGE_SIZE];
501 sread = GNUNET_DISK_file_read (stdin_fd,
504 if ( (GNUNET_SYSERR == sread) ||
507 LOG_DEBUG ("STDIN closed\n");
508 GNUNET_SCHEDULER_shutdown ();
511 if (GNUNET_YES == done_reading)
513 /* didn't expect any more data! */
515 GNUNET_SCHEDULER_shutdown ();
518 LOG_DEBUG ("Read %u bytes\n",
519 (unsigned int) sread);
520 /* FIXME: could introduce a GNUNET_MST_read2 to read
521 directly from 'stdin_fd' and save a memcpy() here */
523 GNUNET_MST_from_buffer (tokenizer,
530 GNUNET_SCHEDULER_shutdown ();
533 read_task_id /* No timeout while reading */
534 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
542 * Main function that will be run.
545 * @param args remaining command-line arguments
546 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
547 * @param cfg configuration
553 const struct GNUNET_CONFIGURATION_Handle *cfg)
555 LOG_DEBUG ("Starting testbed helper...\n");
556 tokenizer = GNUNET_MST_create (&tokenizer_cb, NULL);
557 stdin_fd = GNUNET_DISK_get_handle_from_native (stdin);
558 stdout_fd = GNUNET_DISK_get_handle_from_native (stdout);
560 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
563 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
569 * Signal handler called for SIGCHLD.
572 sighandler_child_death ()
575 int old_errno; /* back-up errno */
579 GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
580 (sigpipe, GNUNET_DISK_PIPE_END_WRITE),
589 * @param argc the number of command line arguments
590 * @param argv command line arg array
591 * @return return code
597 struct GNUNET_SIGNAL_Context *shc_chld;
598 struct GNUNET_GETOPT_CommandLineOption options[] = {
599 GNUNET_GETOPT_OPTION_END
604 if (NULL == (sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO,
605 GNUNET_NO, GNUNET_NO)))
610 shc_chld = GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD,
611 &sighandler_child_death);
612 ret = GNUNET_PROGRAM_run (argc, argv,
613 "gnunet-helper-testbed",
614 "Helper for starting gnunet-service-testbed",
618 GNUNET_SIGNAL_handler_uninstall (shc_chld);
620 GNUNET_DISK_pipe_close (sigpipe);
621 if (GNUNET_OK != ret)
623 return (GNUNET_OK == status) ? 0 : 1;
626 /* end of gnunet-helper-testbed.c */