2 This file is part of GNUnet
3 (C) 2008--2012 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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22 * @file testbed/testbed_api_hosts.c
23 * @brief API for manipulating 'hosts' controlled by the GNUnet testing service;
24 * allows parsing hosts files, starting, stopping and communicating (via
25 * SSH/stdin/stdout) with the remote (or local) processes
26 * @author Christian Grothoff
29 #include "gnunet_util_lib.h"
30 #include "gnunet_testbed_service.h"
31 #include "gnunet_core_service.h"
32 #include "gnunet_transport_service.h"
34 #include "testbed_api.h"
35 #include "testbed_api_hosts.h"
38 * Generic logging shorthand
40 #define LOG(kind, ...) \
41 GNUNET_log_from (kind, "testbed-api-hosts", __VA_ARGS__);
44 * Number of extra elements we create space for when we grow host list
46 #define HOST_LIST_GROW_STEP 10
50 * A list entry for registered controllers list
52 struct RegisteredController
55 * The controller at which this host is registered
57 const struct GNUNET_TESTBED_Controller *controller;
60 * The next ptr for DLL
62 struct RegisteredController *next;
65 * The prev ptr for DLL
67 struct RegisteredController *prev;
72 * Opaque handle to a host running experiments managed by the testing framework.
73 * The master process must be able to SSH to this host without password (via
76 struct GNUNET_TESTBED_Host
80 * The next pointer for DLL
82 struct GNUNET_TESTBED_Host *next;
85 * The prev pointer for DLL
87 struct GNUNET_TESTBED_Host *prev;
90 * The hostname of the host; NULL for localhost
95 * The username to be used for SSH login
100 * The head for the list of controllers where this host is registered
102 struct RegisteredController *rc_head;
105 * The tail for the list of controllers where this host is registered
107 struct RegisteredController *rc_tail;
110 * Global ID we use to refer to a host on the network
115 * The port which is to be used for SSH
123 * Array of available hosts
125 static struct GNUNET_TESTBED_Host **host_list;
128 * The size of the available hosts list
130 static uint32_t host_list_size;
134 * Lookup a host by ID.
136 * @param id global host ID assigned to the host; 0 is
137 * reserved to always mean 'localhost'
138 * @return handle to the host, NULL if host not found
140 struct GNUNET_TESTBED_Host *
141 GNUNET_TESTBED_host_lookup_by_id_ (uint32_t id)
143 if (host_list_size <= id)
145 return host_list[id];
150 * Create a host by ID; given this host handle, we could not
151 * run peers at the host, but we can talk about the host
154 * @param id global host ID assigned to the host; 0 is
155 * reserved to always mean 'localhost'
156 * @return handle to the host, NULL on error
158 struct GNUNET_TESTBED_Host *
159 GNUNET_TESTBED_host_create_by_id_ (uint32_t id)
161 return GNUNET_TESTBED_host_create_with_id (id, NULL, NULL, 0);
166 * Obtain the host's unique global ID.
168 * @param host handle to the host, NULL means 'localhost'
169 * @return id global host ID assigned to the host (0 is
170 * 'localhost', but then obviously not globally unique)
173 GNUNET_TESTBED_host_get_id_ (const struct GNUNET_TESTBED_Host * host)
180 * Obtain the host's hostname.
182 * @param host handle to the host, NULL means 'localhost'
183 * @return hostname of the host
186 GNUNET_TESTBED_host_get_hostname_ (const struct GNUNET_TESTBED_Host *host)
188 return host->hostname;
193 * Obtain the host's username
195 * @param host handle to the host, NULL means 'localhost'
196 * @return username to login to the host
199 GNUNET_TESTBED_host_get_username_ (const struct GNUNET_TESTBED_Host *host)
201 return host->username;
206 * Obtain the host's ssh port
208 * @param host handle to the host, NULL means 'localhost'
209 * @return username to login to the host
212 GNUNET_TESTBED_host_get_ssh_port_ (const struct GNUNET_TESTBED_Host * host)
219 * Create a host to run peers and controllers on.
221 * @param id global host ID assigned to the host; 0 is
222 * reserved to always mean 'localhost'
223 * @param hostname name of the host, use "NULL" for localhost
224 * @param username username to use for the login; may be NULL
225 * @param port port number to use for ssh; use 0 to let ssh decide
226 * @return handle to the host, NULL on error
228 struct GNUNET_TESTBED_Host *
229 GNUNET_TESTBED_host_create_with_id (uint32_t id, const char *hostname,
230 const char *username, uint16_t port)
232 struct GNUNET_TESTBED_Host *host;
235 if ((id < host_list_size) && (NULL != host_list[id]))
237 LOG (GNUNET_ERROR_TYPE_WARNING, "Host with id: %u already created\n", id);
240 host = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Host));
241 host->hostname = (NULL != hostname) ? GNUNET_strdup (hostname) : NULL;
242 host->username = (NULL != username) ? GNUNET_strdup (username) : NULL;
244 host->port = (0 == port) ? 22 : port;
245 new_size = host_list_size;
246 while (id >= new_size)
247 new_size += HOST_LIST_GROW_STEP;
248 if (new_size != host_list_size)
251 GNUNET_realloc (host_list,
252 sizeof (struct GNUNET_TESTBED_Host *) * new_size);
253 (void) memset (&host_list[host_list_size], 0,
254 sizeof (struct GNUNET_TESTBED_Host *) * (new_size -
256 host_list_size = new_size;
258 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding host with id: %u\n", host->id);
259 host_list[id] = host;
265 * Create a host to run peers and controllers on.
267 * @param hostname name of the host, use "NULL" for localhost
268 * @param username username to use for the login; may be NULL
269 * @param port port number to use for ssh; use 0 to let ssh decide
270 * @return handle to the host, NULL on error
272 struct GNUNET_TESTBED_Host *
273 GNUNET_TESTBED_host_create (const char *hostname, const char *username,
276 static uint32_t uid_generator;
278 if (NULL == hostname)
279 return GNUNET_TESTBED_host_create_with_id (0, hostname, username, port);
280 return GNUNET_TESTBED_host_create_with_id (++uid_generator, hostname,
286 * Load a set of hosts from a configuration file.
288 * @param filename file with the host specification
289 * @param hosts set to the hosts found in the file; caller must free this if
290 * number of hosts returned is greater than 0
291 * @return number of hosts returned in 'hosts', 0 on error
294 GNUNET_TESTBED_hosts_load_from_file (const char *filename,
295 struct GNUNET_TESTBED_Host ***hosts)
297 //struct GNUNET_TESTBED_Host **host_array;
298 struct GNUNET_TESTBED_Host *starting_host;
310 GNUNET_assert (NULL != filename);
311 if (GNUNET_YES != GNUNET_DISK_file_test (filename))
313 LOG (GNUNET_ERROR_TYPE_WARNING, _("Hosts file %s not found\n"), filename);
317 GNUNET_DISK_file_size (filename, &fs, GNUNET_YES, GNUNET_YES))
321 LOG (GNUNET_ERROR_TYPE_WARNING, _("Hosts file %s has no data\n"), filename);
324 data = GNUNET_malloc (fs);
325 if (fs != GNUNET_DISK_fn_read (filename, data, fs))
328 LOG (GNUNET_ERROR_TYPE_WARNING, _("Hosts file %s cannot be read\n"),
334 starting_host = NULL;
336 while (offset < (fs - 1))
339 if (((data[offset] == '\n')) && (buf != &data[offset]))
344 ret = SSCANF (buf, "%a[a-zA-Z0-9_]@%a[a-zA-Z0-9.]:%hd",
345 &username, &hostname, &port);
348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
349 "Successfully read host %s, port %d and user %s from file\n",
350 hostname, port, username);
351 /* We store hosts in a static list; hence we only require the starting
352 host pointer in that list to access the newly created list of hosts */
353 if (NULL == starting_host)
354 starting_host = GNUNET_TESTBED_host_create (hostname, username,
357 (void) GNUNET_TESTBED_host_create (hostname, username, port);
361 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
362 "Error reading line `%s' in hostfile\n", buf);
363 GNUNET_free_non_null (hostname);
364 GNUNET_free_non_null (username);
365 buf = &data[offset + 1];
367 else if ((data[offset] == '\n') || (data[offset] == '\0'))
368 buf = &data[offset + 1];
371 if (NULL == starting_host)
373 *hosts = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Host *) * count);
375 &host_list[GNUNET_TESTBED_host_get_id_ (starting_host)],
376 sizeof (struct GNUNET_TESTBED_Host *) * count);
382 * Destroy a host handle. Must only be called once everything
383 * running on that host has been stopped.
385 * @param host handle to destroy
388 GNUNET_TESTBED_host_destroy (struct GNUNET_TESTBED_Host *host)
390 struct RegisteredController *rc;
393 GNUNET_assert (host->id < host_list_size);
394 GNUNET_assert (host_list[host->id] == host);
395 host_list[host->id] = NULL;
396 /* clear registered controllers list */
397 for (rc = host->rc_head; NULL != rc; rc = host->rc_head)
399 GNUNET_CONTAINER_DLL_remove (host->rc_head, host->rc_tail, rc);
402 GNUNET_free_non_null ((char *) host->username);
403 GNUNET_free_non_null ((char *) host->hostname);
405 while (host_list_size >= HOST_LIST_GROW_STEP)
407 for (id = host_list_size - 1; id > host_list_size - HOST_LIST_GROW_STEP;
409 if (NULL != host_list[id])
411 if (id != host_list_size - HOST_LIST_GROW_STEP)
413 if (NULL != host_list[id])
415 host_list_size -= HOST_LIST_GROW_STEP;
418 GNUNET_realloc (host_list,
419 sizeof (struct GNUNET_TESTBED_Host *) * host_list_size);
424 * Marks a host as registered with a controller
426 * @param host the host to mark
427 * @param controller the controller at which this host is registered
430 GNUNET_TESTBED_mark_host_registered_at_ (struct GNUNET_TESTBED_Host *host,
431 const struct GNUNET_TESTBED_Controller
434 struct RegisteredController *rc;
436 for (rc = host->rc_head; NULL != rc; rc = rc->next)
438 if (controller == rc->controller) /* already registered at controller */
444 rc = GNUNET_malloc (sizeof (struct RegisteredController));
445 rc->controller = controller;
446 //host->controller = controller;
447 GNUNET_CONTAINER_DLL_insert_tail (host->rc_head, host->rc_tail, rc);
452 * Checks whether a host has been registered
454 * @param host the host to check
455 * @param controller the controller at which host's registration is checked
456 * @return GNUNET_YES if registered; GNUNET_NO if not
459 GNUNET_TESTBED_is_host_registered_ (const struct GNUNET_TESTBED_Host *host,
460 const struct GNUNET_TESTBED_Controller
463 struct RegisteredController *rc;
465 for (rc = host->rc_head; NULL != rc; rc = rc->next)
467 if (controller == rc->controller) /* already registered at controller */
477 * Checks whether a host can be used to start testbed service
479 * @param host the host to check
480 * @return GNUNET_YES if testbed service can be started on the given host
481 * remotely; GNUNET_NO if not
484 GNUNET_TESTBED_is_host_habitable (const struct GNUNET_TESTBED_Host *host)
486 char *remote_args[11];
489 const char *hostname;
490 struct GNUNET_OS_Process *auxp;
492 enum GNUNET_OS_ProcessStatusType type;
498 hostname = (NULL == host->hostname) ? "127.0.0.1" : host->hostname;
499 if (NULL == host->username)
500 ssh_addr = GNUNET_strdup (hostname);
502 GNUNET_asprintf (&ssh_addr, "%s@%s", host->username, hostname);
504 remote_args[argp++] = "ssh";
505 GNUNET_asprintf (&portstr, "%u", host->port);
506 remote_args[argp++] = "-p";
507 remote_args[argp++] = portstr;
508 remote_args[argp++] = "-o";
509 remote_args[argp++] = "BatchMode=yes";
510 remote_args[argp++] = "-o";
511 remote_args[argp++] = "NoHostAuthenticationForLocalhost=yes";
512 remote_args[argp++] = ssh_addr;
513 remote_args[argp++] = "which";
514 remote_args[argp++] = "gnunet-helper-testbed";
515 remote_args[argp++] = NULL;
516 GNUNET_assert (argp == 11);
518 GNUNET_OS_start_process_vap (GNUNET_NO, GNUNET_OS_INHERIT_STD_ALL, NULL,
519 NULL, "ssh", remote_args);
522 GNUNET_free (ssh_addr);
523 GNUNET_free (portstr);
528 ret = GNUNET_OS_process_status (auxp, &type, &code);
529 GNUNET_assert (GNUNET_SYSERR != ret);
532 while (GNUNET_NO == ret);
533 //(void) GNUNET_OS_process_wait (auxp);
534 GNUNET_OS_process_destroy (auxp);
535 GNUNET_free (ssh_addr);
536 GNUNET_free (portstr);
537 return (0 != code) ? GNUNET_NO : GNUNET_YES;
540 /* end of testbed_api_hosts.c */