2 This file is part of GNUnet
3 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file dv/plugin_transport_dv.c
23 * @brief DV transport service, takes incoming DV requests and deals with
25 * @author Christian Grothoff
31 * As a start, the dv plugin needs to listen for information from the dv
32 * service. The plugin (?) will be notified by core (?) when a tcp/udp/whatever
33 * message comes in that should be for dv. The plugin will then hand off the message
34 * to the dv service which will decrypt/validate the message (?) and then send the
35 * result back to us (the transport) which will then send the message to the transport
38 * Or, core will notify the dv service directly which will validate,
39 * etc. and then just send a message to us.
41 * For starters, this plugin needs to have a client which will listen for messages from
42 * the dv service that need to be sent up to the gnunet-transport-service.
44 * Messages sent from the dv transport get passed to the dv service which deals
45 * with the actual sending (how much state does this transport need? should it know
46 * which peers it is currently connected to and their distances, or just assume that
47 * anything should be passed along to the dv service?).
50 #include "gnunet_protocols.h"
51 #include "gnunet_connection_lib.h"
52 #include "gnunet_server_lib.h"
53 #include "gnunet_service_lib.h"
54 #include "gnunet_statistics_service.h"
55 #include "gnunet_dv_service.h"
56 #include "gnunet_transport_service.h"
57 #include "../transport/plugin_transport.h"
60 #define DEBUG_TEMPLATE GNUNET_NO
63 * Encapsulation of all of the state of the plugin.
69 * Session handle for connections.
75 * Stored in a linked list.
80 * Pointer to the global plugin struct.
82 struct Plugin *plugin;
85 * The client (used to identify this connection)
90 * Continuation function to call once the transmission buffer
91 * has again space available. NULL if there is no
92 * continuation to call.
94 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
97 * Closure for transmit_cont.
99 void *transmit_cont_cls;
102 * To whom are we talking to (set to our identity
103 * if we are still waiting for the welcome message)
105 struct GNUNET_PeerIdentity sender;
108 * At what time did we reset last_received last?
110 struct GNUNET_TIME_Absolute last_quota_update;
113 * How many bytes have we received since the "last_quota_update"
116 uint64_t last_received;
119 * Number of bytes per ms that this peer is allowed
127 * Encapsulation of all of the state of the plugin.
134 struct GNUNET_TRANSPORT_PluginEnvironment *env;
137 * List of open sessions.
139 struct Session *sessions;
142 * Handle for the statistics service.
144 struct GNUNET_STATISTICS_Handle *statistics;
149 //struct GNUNET_SERVER_Handle *server;
152 * Handle to the running service.
154 //struct GNUNET_SERVICE_Context *service;
157 * Copy of the handler array where the closures are
158 * set to this struct's instance.
160 struct GNUNET_SERVER_MessageHandler *handlers;
163 * Handle to the DV service
165 struct GNUNET_DV_Handle *dv_handle;
170 * Handler for messages received from the DV service.
172 void handle_dv_message_received (void *cls,
173 struct GNUNET_PeerIdentity *sender,
176 unsigned int distance,
177 char *sender_address,
178 size_t sender_address_len)
180 struct Plugin *plugin = cls;
182 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
183 "plugin_transport_dv",
184 _("Received message from %s of type %d!\n"),
185 "DV SERVICE", ntohs(((struct GNUNET_MessageHeader *)msg)->type));
186 plugin->env->receive(plugin->env->cls,
188 (struct GNUNET_MessageHeader *)msg,
196 /* Question: how does the transport service learn of a newly connected (gossipped about)
197 * DV peer? Should the plugin (here) create a HELLO for that peer and send it along,
198 * or should the DV service create a HELLO and send it to us via the other part?
202 * Function that can be used by the transport service to transmit
203 * a message using the plugin.
206 * @param target who should receive this message
207 * @param priority how important is the message
208 * @param msgbuf the message to transmit
209 * @param msgbuf_size number of bytes in 'msgbuf'
210 * @param timeout when should we time out
211 * @param addr the address to use (can be NULL if the plugin
212 * is "on its own" (i.e. re-use existing TCP connection))
213 * @param addrlen length of the address in bytes
214 * @param force_address GNUNET_YES if the plugin MUST use the given address,
215 * otherwise the plugin may use other addresses or
216 * existing connections (if available)
217 * @param cont continuation to call once the message has
218 * been transmitted (or if the transport is ready
219 * for the next transmission call; or if the
220 * peer disconnected...)
221 * @param cont_cls closure for cont
222 * @return number of bytes used (on the physical network, with overheads);
223 * -1 on hard errors (i.e. address invalid); 0 is a legal value
224 * and does NOT mean that the message was not transmitted (DV)
227 dv_plugin_send (void *cls,
228 const struct GNUNET_PeerIdentity *target,
231 unsigned int priority,
232 struct GNUNET_TIME_Relative timeout,
236 GNUNET_TRANSPORT_TransmitContinuation
237 cont, void *cont_cls)
240 struct Plugin *plugin = cls;
242 /* FIXME: do we want the dv plugin to remember sent messages to call continuation once message actually goes out?
243 * Or do we just call the continuation once we've notified the plugin?
246 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "DV API: Received send request from transport, calling GNUNET_DV_send\n");
248 ret = GNUNET_DV_send(plugin->dv_handle,
258 cont(cont_cls, target, GNUNET_OK);
260 cont(cont_cls, target, GNUNET_SYSERR);
268 * Function that can be used to force the plugin to disconnect
269 * from the given peer and cancel all previous transmissions
270 * (and their continuations).
273 * @param target peer from which to disconnect
276 dv_plugin_disconnect (void *cls,
277 const struct GNUNET_PeerIdentity *target)
279 // struct Plugin *plugin = cls;
280 // TODO: Add message type to send to dv service to "disconnect" a peer
285 * Convert the transports address to a nice, human-readable
289 * @param type name of the transport that generated the address
290 * @param addr one of the addresses of the host, NULL for the last address
291 * the specific address format depends on the transport
292 * @param addrlen length of the address
293 * @param numeric should (IP) addresses be displayed in numeric form?
294 * @param timeout after how long should we give up?
295 * @param asc function to call on each string
296 * @param asc_cls closure for asc
299 dv_plugin_address_pretty_printer (void *cls,
304 struct GNUNET_TIME_Relative timeout,
305 GNUNET_TRANSPORT_AddressStringCallback
314 * Another peer has suggested an address for this
315 * peer and transport plugin. Check that this could be a valid
316 * address. If so, consider adding it to the list
320 * @param addr pointer to the address
321 * @param addrlen length of addr
322 * @return GNUNET_OK if this is a plausible address for this peer
325 * FIXME: does this mean anything for the DV plugin?
328 dv_plugin_address_suggested (void *cls,
329 void *addr, size_t addrlen)
331 /* struct Plugin *plugin = cls; */
333 /* check if the address is plausible; if so,
334 add it to our list! */
340 * Entry point for the plugin.
343 libgnunet_plugin_transport_dv_init (void *cls)
345 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
346 struct GNUNET_TRANSPORT_PluginFunctions *api;
347 struct Plugin *plugin;
349 plugin = GNUNET_malloc (sizeof (struct Plugin));
351 plugin->statistics = NULL;
352 //plugin->service = service;
353 //plugin->server = GNUNET_SERVICE_get_server (service);
355 plugin->dv_handle = GNUNET_DV_connect(env->sched, env->cfg, &handle_dv_message_received, plugin);
357 if (plugin->dv_handle == NULL)
363 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
365 api->send = &dv_plugin_send;
366 api->disconnect = &dv_plugin_disconnect;
367 api->address_pretty_printer = &dv_plugin_address_pretty_printer;
368 api->check_address = &dv_plugin_address_suggested;
374 * Exit point from the plugin.
377 libgnunet_plugin_transport_dv_done (void *cls)
379 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
380 struct Plugin *plugin = api->cls;
382 GNUNET_free (plugin);
387 /* end of plugin_transport_template.c */