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22 * @file testbed/gnunet-helper-testbed.c
23 * @brief Helper binary that is started from a remote controller to start
24 * gnunet-service-testbed. This binary also receives configuration
25 * from the remove controller which is put in a temporary location
26 * with ports and paths fixed so that gnunet-service-testbed runs
27 * without any hurdles.
29 * This helper monitors for three termination events. They are: (1)The
30 * stdin of the helper is closed for reading; (2)the helper received
31 * SIGTERM/SIGINT; (3)the testbed crashed. In case of events 1 and 2
32 * the helper kills the testbed service. When testbed crashed (event
33 * 3), the helper should send a SIGTERM to its own process group; this
34 * behaviour will help terminate any child processes (peers) testbed
35 * has started and prevents them from leaking and running forever.
37 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
42 #include "gnunet_util_lib.h"
43 #include "gnunet_testing_lib.h"
44 #include "gnunet_testbed_service.h"
45 #include "testbed_helper.h"
46 #include "testbed_api.h"
50 * Generic logging shortcut
52 #define LOG(kind, ...) \
53 GNUNET_log (kind, __VA_ARGS__)
56 * Debug logging shorthand
58 #define LOG_DEBUG(...) \
59 LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
63 * We need pipe control only on WINDOWS
66 #define PIPE_CONTROL GNUNET_YES
68 #define PIPE_CONTROL GNUNET_NO
73 * Context for a single write on a chunk of memory
83 * The length of the data
88 * The current position from where the write operation should begin
95 * Handle to the testing system
97 static struct GNUNET_TESTING_System *test_system;
100 * Our message stream tokenizer
102 struct GNUNET_MessageStreamTokenizer *tokenizer;
105 * Disk handle from stdin
107 static struct GNUNET_DISK_FileHandle *stdin_fd;
110 * Disk handle for stdout
112 static struct GNUNET_DISK_FileHandle *stdout_fd;
115 * The process handle to the testbed service
117 static struct GNUNET_OS_Process *testbed;
120 * Pipe used to communicate shutdown via signal.
122 static struct GNUNET_DISK_PipeHandle *sigpipe;
125 * Task identifier for the read task
127 static struct GNUNET_SCHEDULER_Task *read_task_id;
130 * Task identifier for the write task
132 static struct GNUNET_SCHEDULER_Task *write_task_id;
135 * Task to kill the child
137 static struct GNUNET_SCHEDULER_Task *child_death_task_id;
140 * Are we done reading messages from stdin?
142 static int done_reading;
145 * Result to return in case we fail
151 * Task to shut down cleanly
156 shutdown_task (void *cls)
158 LOG_DEBUG ("Shutting down\n");
161 LOG_DEBUG ("Killing testbed\n");
162 GNUNET_break (0 == GNUNET_OS_process_kill (testbed, GNUNET_TERM_SIG));
164 if (NULL != read_task_id)
166 GNUNET_SCHEDULER_cancel (read_task_id);
169 if (NULL != write_task_id)
171 struct WriteContext *wc;
173 wc = GNUNET_SCHEDULER_cancel (write_task_id);
174 write_task_id = NULL;
175 GNUNET_free (wc->data);
178 if (NULL != child_death_task_id)
180 GNUNET_SCHEDULER_cancel (child_death_task_id);
181 child_death_task_id = NULL;
183 if (NULL != stdin_fd)
184 (void) GNUNET_DISK_file_close (stdin_fd);
185 if (NULL != stdout_fd)
186 (void) GNUNET_DISK_file_close (stdout_fd);
187 GNUNET_MST_destroy (tokenizer);
191 GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (testbed));
192 GNUNET_OS_process_destroy (testbed);
195 if (NULL != test_system)
197 GNUNET_TESTING_system_destroy (test_system, GNUNET_YES);
204 * Task to write to the standard out
206 * @param cls the WriteContext
209 write_task (void *cls)
211 struct WriteContext *wc = cls;
214 GNUNET_assert (NULL != wc);
215 write_task_id = NULL;
217 GNUNET_DISK_file_write (stdout_fd, wc->data + wc->pos,
218 wc->length - wc->pos);
219 if (GNUNET_SYSERR == bytes_wrote)
221 LOG (GNUNET_ERROR_TYPE_WARNING,
222 "Cannot reply back configuration\n");
223 GNUNET_free (wc->data);
227 wc->pos += bytes_wrote;
228 if (wc->pos == wc->length)
230 GNUNET_free (wc->data);
235 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
242 * Task triggered whenever we receive a SIGCHLD (child
245 * @param cls closure, NULL if we need to self-restart
248 child_death_task (void *cls)
250 const struct GNUNET_DISK_FileHandle *pr;
252 enum GNUNET_OS_ProcessStatusType type;
256 pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
257 child_death_task_id = NULL;
258 /* consume the signal */
259 GNUNET_break (0 < GNUNET_DISK_file_read (pr, &c, sizeof (c)));
260 LOG_DEBUG ("Got SIGCHLD\n");
266 GNUNET_break (GNUNET_SYSERR !=
267 (ret = GNUNET_OS_process_status (testbed, &type, &code)));
268 if (GNUNET_NO != ret)
270 GNUNET_OS_process_destroy (testbed);
272 /* Send SIGTERM to our process group */
273 if (0 != PLIBC_KILL (0, GNUNET_TERM_SIG))
275 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "signal");
276 GNUNET_SCHEDULER_shutdown (); /* Couldn't send the signal, we shutdown frowning */
280 LOG_DEBUG ("Child hasn't died. Resuming to monitor its status\n");
281 child_death_task_id =
282 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
283 pr, &child_death_task, NULL);
288 * Functions with this signature are called whenever a
289 * complete message is received by the tokenizer.
291 * Do not call #GNUNET_mst_destroy() in this callback
293 * @param cls identification of the client
294 * @param message the actual message
296 * @return #GNUNET_OK on success, #GNUNET_SYSERR to stop further processing
299 tokenizer_cb (void *cls,
300 const struct GNUNET_MessageHeader *message)
302 const struct GNUNET_TESTBED_HelperInit *msg;
303 struct GNUNET_TESTBED_HelperReply *reply;
304 struct GNUNET_CONFIGURATION_Handle *cfg;
305 struct WriteContext *wc;
314 uLongf ul_config_size;
316 uint16_t trusted_ip_size;
317 uint16_t hostname_size;
320 msize = ntohs (message->size);
321 if ((sizeof (struct GNUNET_TESTBED_HelperInit) >= msize) ||
322 (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_INIT != ntohs (message->type)))
324 LOG (GNUNET_ERROR_TYPE_WARNING,
325 "Received unexpected message -- exiting\n");
328 msg = (const struct GNUNET_TESTBED_HelperInit *) message;
329 trusted_ip_size = ntohs (msg->trusted_ip_size);
330 trusted_ip = (char *) &msg[1];
331 if ('\0' != trusted_ip[trusted_ip_size])
333 LOG (GNUNET_ERROR_TYPE_WARNING, "Trusted IP cannot be empty -- exiting\n");
336 hostname_size = ntohs (msg->hostname_size);
337 if ((sizeof (struct GNUNET_TESTBED_HelperInit) + trusted_ip_size + 1 +
338 hostname_size) >= msize)
341 LOG (GNUNET_ERROR_TYPE_WARNING, "Received unexpected message -- exiting\n");
344 ul_config_size = (uLongf) ntohs (msg->config_size);
345 config = GNUNET_malloc (ul_config_size);
347 ntohs (message->size) - (trusted_ip_size + 1 +
348 sizeof (struct GNUNET_TESTBED_HelperInit));
350 uncompress ((Bytef *) config, &ul_config_size,
351 (const Bytef *) (trusted_ip + trusted_ip_size + 1 +
352 hostname_size), (uLongf) xconfig_size))
354 LOG (GNUNET_ERROR_TYPE_WARNING,
355 "Error while uncompressing config -- exiting\n");
356 GNUNET_free (config);
359 cfg = GNUNET_CONFIGURATION_create ();
361 GNUNET_CONFIGURATION_deserialize (cfg, config, ul_config_size, GNUNET_NO))
363 LOG (GNUNET_ERROR_TYPE_WARNING,
364 "Unable to deserialize config -- exiting\n");
365 GNUNET_free (config);
368 GNUNET_free (config);
370 if (0 != hostname_size)
372 hostname = GNUNET_malloc (hostname_size + 1);
373 (void) strncpy (hostname, ((char *) &msg[1]) + trusted_ip_size + 1,
375 hostname[hostname_size] = '\0';
377 /* unset GNUNET_TESTING_PREFIX if present as it is more relevant for testbed */
378 evstr = getenv (GNUNET_TESTING_PREFIX);
381 /* unsetting the variable will invalidate the pointer! */
382 evstr = GNUNET_strdup (evstr);
384 GNUNET_break (0 != SetEnvironmentVariable (GNUNET_TESTING_PREFIX, NULL));
386 GNUNET_break (0 == unsetenv (GNUNET_TESTING_PREFIX));
390 GNUNET_TESTING_system_create ("testbed-helper", trusted_ip, hostname,
395 GNUNET_assert (0 != SetEnvironmentVariable (GNUNET_TESTING_PREFIX,
400 GNUNET_asprintf (&evar,
401 GNUNET_TESTING_PREFIX "=%s",
403 GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
404 see putenv(): becomes part of envrionment! */
409 GNUNET_free_non_null (hostname);
411 GNUNET_assert (NULL != test_system);
412 GNUNET_assert (GNUNET_OK ==
413 GNUNET_TESTING_configuration_create (test_system, cfg));
414 GNUNET_assert (GNUNET_OK ==
415 GNUNET_CONFIGURATION_get_value_filename (cfg, "PATHS",
418 if (GNUNET_OK != GNUNET_CONFIGURATION_write (cfg, config))
420 LOG (GNUNET_ERROR_TYPE_WARNING,
421 "Unable to write config file: %s -- exiting\n", config);
422 GNUNET_CONFIGURATION_destroy (cfg);
423 GNUNET_free (config);
426 LOG_DEBUG ("Staring testbed with config: %s\n", config);
427 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-service-testbed");
431 /* expose testbed configuration through env variable */
432 GNUNET_asprintf (&evar,
436 GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
437 see putenv(): becomes part of envrionment! */
441 GNUNET_OS_start_process (PIPE_CONTROL,
442 GNUNET_OS_INHERIT_STD_ERR /*verbose? */ ,
445 "gnunet-service-testbed",
448 GNUNET_free (binary);
449 GNUNET_free (config);
452 LOG (GNUNET_ERROR_TYPE_WARNING,
453 "Error starting gnunet-service-testbed -- exiting\n");
454 GNUNET_CONFIGURATION_destroy (cfg);
457 done_reading = GNUNET_YES;
458 config = GNUNET_CONFIGURATION_serialize (cfg, &config_size);
459 GNUNET_CONFIGURATION_destroy (cfg);
462 GNUNET_TESTBED_compress_config_ (config, config_size, &xconfig);
463 GNUNET_free (config);
464 wc = GNUNET_new (struct WriteContext);
465 wc->length = xconfig_size + sizeof (struct GNUNET_TESTBED_HelperReply);
466 reply = GNUNET_realloc (xconfig, wc->length);
467 memmove (&reply[1], reply, xconfig_size);
468 reply->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_REPLY);
469 reply->header.size = htons ((uint16_t) wc->length);
470 reply->config_size = htons ((uint16_t) config_size);
473 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
476 child_death_task_id =
477 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
478 GNUNET_DISK_pipe_handle (sigpipe,
479 GNUNET_DISK_PIPE_END_READ),
480 &child_death_task, NULL);
484 status = GNUNET_SYSERR;
485 GNUNET_SCHEDULER_shutdown ();
486 return GNUNET_SYSERR;
491 * Task to read from stdin
496 read_task (void *cls)
498 char buf[GNUNET_MAX_MESSAGE_SIZE];
502 sread = GNUNET_DISK_file_read (stdin_fd,
505 if ( (GNUNET_SYSERR == sread) ||
508 LOG_DEBUG ("STDIN closed\n");
509 GNUNET_SCHEDULER_shutdown ();
512 if (GNUNET_YES == done_reading)
514 /* didn't expect any more data! */
516 GNUNET_SCHEDULER_shutdown ();
519 LOG_DEBUG ("Read %u bytes\n",
520 (unsigned int) sread);
521 /* FIXME: could introduce a GNUNET_MST_read2 to read
522 directly from 'stdin_fd' and save a memcpy() here */
524 GNUNET_MST_from_buffer (tokenizer,
531 GNUNET_SCHEDULER_shutdown ();
534 read_task_id /* No timeout while reading */
535 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
543 * Main function that will be run.
546 * @param args remaining command-line arguments
547 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
548 * @param cfg configuration
554 const struct GNUNET_CONFIGURATION_Handle *cfg)
556 LOG_DEBUG ("Starting testbed helper...\n");
557 tokenizer = GNUNET_MST_create (&tokenizer_cb, NULL);
558 stdin_fd = GNUNET_DISK_get_handle_from_native (stdin);
559 stdout_fd = GNUNET_DISK_get_handle_from_native (stdout);
561 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
564 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
570 * Signal handler called for SIGCHLD.
573 sighandler_child_death ()
576 int old_errno; /* back-up errno */
580 GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
581 (sigpipe, GNUNET_DISK_PIPE_END_WRITE),
590 * @param argc the number of command line arguments
591 * @param argv command line arg array
592 * @return return code
598 struct GNUNET_SIGNAL_Context *shc_chld;
599 struct GNUNET_GETOPT_CommandLineOption options[] = {
600 GNUNET_GETOPT_OPTION_END
605 if (NULL == (sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO,
606 GNUNET_NO, GNUNET_NO)))
611 shc_chld = GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD,
612 &sighandler_child_death);
613 ret = GNUNET_PROGRAM_run (argc, argv,
614 "gnunet-helper-testbed",
615 "Helper for starting gnunet-service-testbed",
619 GNUNET_SIGNAL_handler_uninstall (shc_chld);
621 GNUNET_DISK_pipe_close (sigpipe);
622 if (GNUNET_OK != ret)
624 return (GNUNET_OK == status) ? 0 : 1;
627 /* end of gnunet-helper-testbed.c */