GNUnet  0.10.x
cadet_api_list_peers.c
Go to the documentation of this file.
1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2011, 2017, 2019 GNUnet e.V.
4 
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.
9 
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.
14 
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/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19 */
26 #include "platform.h"
27 #include "gnunet_util_lib.h"
28 #include "gnunet_constants.h"
29 #include "gnunet_cadet_service.h"
30 #include "cadet.h"
31 #include "cadet_protocol.h"
32 
33 
38 {
39 
44 
48  void *peers_cb_cls;
49 
54 
59 
64 
69 
70 };
71 
72 
79 static void
80 handle_get_peers (void *cls,
81  const struct GNUNET_CADET_LocalInfoPeers *info)
82 {
83  struct GNUNET_CADET_PeersLister *pl = cls;
84  struct GNUNET_CADET_PeerListEntry ple;
85 
86  ple.peer = info->destination;
87  ple.have_tunnel = (int) ntohs (info->tunnel);
88  ple.n_paths = (unsigned int) ntohs (info->paths);
89  ple.best_path_length = (unsigned int) ntohl (info->best_path_length);
90  pl->peers_cb (pl->peers_cb_cls,
91  &ple);
92 }
93 
94 
101 static void
103  const struct GNUNET_MessageHeader *msg)
104 {
105  struct GNUNET_CADET_PeersLister *pl = cls;
106  (void) msg;
107 
108  pl->peers_cb (pl->peers_cb_cls,
109  NULL);
111 }
112 
113 
119 static void
120 reconnect (void *cls);
121 
122 
129 static void
130 error_handler (void *cls,
131  enum GNUNET_MQ_Error error)
132 {
133  struct GNUNET_CADET_PeersLister *pl = cls;
134 
135  GNUNET_MQ_destroy (pl->mq);
136  pl->mq = NULL;
140  &reconnect,
141  pl);
142 }
143 
144 
150 static void
151 reconnect (void *cls)
152 {
153  struct GNUNET_CADET_PeersLister *pl = cls;
154  struct GNUNET_MQ_MessageHandler handlers[] = {
158  pl),
159  GNUNET_MQ_hd_fixed_size (get_peers_end,
161  struct GNUNET_MessageHeader,
162  pl),
164  };
165  struct GNUNET_MessageHeader *msg;
166  struct GNUNET_MQ_Envelope *env;
167 
168  pl->reconnect_task = NULL;
169  pl->mq = GNUNET_CLIENT_connect (pl->cfg,
170  "cadet",
171  handlers,
172  &error_handler,
173  pl);
174  if (NULL == pl->mq)
175  return;
176  env = GNUNET_MQ_msg (msg,
178  GNUNET_MQ_send (pl->mq,
179  env);
180 }
181 
182 
195  GNUNET_CADET_PeersCB callback,
196  void *callback_cls)
197 {
198  struct GNUNET_CADET_PeersLister *pl;
199 
200  if (NULL == callback)
201  {
202  GNUNET_break (0);
203  return NULL;
204  }
205  pl = GNUNET_new (struct GNUNET_CADET_PeersLister);
206  pl->peers_cb = callback;
207  pl->peers_cb_cls = callback_cls;
208  pl->cfg = cfg;
209  reconnect (pl);
210  if (NULL == pl->mq)
211  {
212  GNUNET_free (pl);
213  return NULL;
214  }
215  return pl;
216 }
217 
218 
225 void *
227 {
228  void *ret = pl->peers_cb_cls;
229 
230  if (NULL != pl->mq)
231  GNUNET_MQ_destroy (pl->mq);
232  if (NULL != pl->reconnect_task)
234  GNUNET_free (pl);
235  return ret;
236 }
237 
238 /* end of cadet_api_list_peers.c */
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we use.
static void error_handler(void *cls, enum GNUNET_MQ_Error error)
Function called on connection trouble.
struct GNUNET_SCHEDULER_Task * reconnect_task
Task to reconnect.
struct GNUNET_MQ_Handle * GNUNET_CLIENT_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *service_name, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *error_handler_cls)
Create a message queue to connect to a GNUnet service.
Definition: client.c:901
static void handle_get_peers(void *cls, const struct GNUNET_CADET_LocalInfoPeers *info)
Process a local reply about info on all tunnels, pass info to the user.
void * peers_cb_cls
Info callback closure for info_cb.
GNUNET_MQ_Error
Error codes for the queue.
#define GNUNET_TIME_UNIT_MINUTES
One minute.
static void handle_get_peers_end(void *cls, const struct GNUNET_MessageHeader *msg)
Process a end of list reply about info on all peers.
uint32_t best_path_length
Shortest known path.
Definition: cadet.h:359
struct GNUNET_MQ_Handle * mq
Message queue to talk to CADET service.
#define GNUNET_MQ_hd_fixed_size(name, code, str, ctx)
#define GNUNET_MQ_msg(mvar, type)
Allocate a GNUNET_MQ_Envelope.
Definition: gnunet_mq_lib.h:67
#define GNUNET_new(type)
Allocate a struct or union of the given type.
uint16_t paths
Number of paths.
Definition: cadet.h:349
struct GNUNET_CADET_PeersLister * GNUNET_CADET_list_peers(const struct GNUNET_CONFIGURATION_Handle *cfg, GNUNET_CADET_PeersCB callback, void *callback_cls)
Request information about peers known to the running cadet service.
static int ret
Final status code.
Definition: gnunet-arm.c:89
void * GNUNET_CADET_list_peers_cancel(struct GNUNET_CADET_PeersLister *pl)
Cancel a peer info request.
int16_t tunnel
Do we have a tunnel toward this peer?
Definition: cadet.h:354
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
unsigned int best_path_length
Length of the shortest path (0 = unknown, 1 = ourselves, 2 = direct neighbour).
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1246
struct GNUNET_TIME_Relative backoff
Backoff for reconnect attempts.
#define GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS_END
End of local information about all peers known to the service.
Message to inform the client about one of the peers in the service.
Definition: cadet.h:339
static void get_peers(void *cls)
Call CADET&#39;s meta API, get all peers known to a peer.
Definition: gnunet-cadet.c:605
struct GNUNET_PeerIdentity peer
Which peer is the information about?
Message handler for a specific message type.
#define GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_PEERS
Request local information about all peers known to the service.
int have_tunnel
Do we have a tunnel to this peer?
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
P2P messages used by CADET.
Handle to a message queue.
Definition: mq.c:85
static void reconnect(void *cls)
Reconnect to the service and try again.
configuration data
Definition: configuration.c:85
void(* GNUNET_CADET_PeersCB)(void *cls, const struct GNUNET_CADET_PeerListEntry *ple)
Method called to retrieve information about all peers in CADET, called once per peer.
#define GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS
Local information about all peers known to the service.
Information we return per peer.
Entry in list of pending tasks.
Definition: scheduler.c:134
unsigned int n_paths
Number of disjoint known paths to peer.
struct GNUNET_PeerIdentity destination
ID of the peer (can be local peer).
Definition: cadet.h:364
Header for all communications.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:824
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:353
GNUNET_CADET_PeersCB peers_cb
Monitor callback.
struct GNUNET_TIME_Relative GNUNET_TIME_randomized_backoff(struct GNUNET_TIME_Relative rt, struct GNUNET_TIME_Relative threshold)
Randomized exponential back-off, starting at 1 ms and going up by a factor of 2+r, where 0 <= r <= 0.5, up to a maximum of the given threshold.
Definition: time.c:759
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
#define GNUNET_free(ptr)
Wrapper around free.
Time for relative time used by GNUnet, in microseconds.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:965