2 This file is part of GNUnet.
3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_hello.c
23 * @brief hello management implementation
24 * @author Christian Grothoff
27 #include "gnunet_constants.h"
28 #include "gnunet_hello_lib.h"
29 #include "gnunet_peerinfo_service.h"
30 #include "gnunet_statistics_service.h"
31 #include "gnunet-service-transport_hello.h"
32 #include "gnunet-service-transport.h"
33 #include "gnunet-service-transport_plugins.h"
37 * How often do we refresh our HELLO (due to expiration concerns)?
39 #define HELLO_REFRESH_PERIOD GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
42 * Hello address expiration
44 extern struct GNUNET_TIME_Relative hello_expiration;
48 * Entry in linked list of network addresses for ourselves. Also
49 * includes a cached signature for 'struct TransportPongMessage's.
54 * This is a doubly-linked list.
56 struct OwnAddressList *next;
59 * This is a doubly-linked list.
61 struct OwnAddressList *prev;
66 struct GNUNET_HELLO_Address *address;
69 * How long until the current signature expires? (ZERO if the
70 * signature was never created).
72 struct GNUNET_TIME_Absolute pong_sig_expires;
75 * Signature for a 'struct TransportPongMessage' for this address.
77 struct GNUNET_CRYPTO_RsaSignature pong_signature;
85 static struct GNUNET_HELLO_Message *our_hello;
88 * Function to call on HELLO changes.
90 static GST_HelloCallback hello_cb;
93 * Closure for 'hello_cb'.
95 static void *hello_cb_cls;
98 * Head of my addresses.
100 struct OwnAddressList *oal_head;
103 * Tail of my addresses.
105 struct OwnAddressList *oal_tail;
108 * Identifier of 'refresh_hello' task.
110 static GNUNET_SCHEDULER_TaskIdentifier hello_task;
114 * Closure for 'address_generator'.
116 struct GeneratorContext
119 * Where are we in the DLL?
121 struct OwnAddressList *addr_pos;
124 * When do addresses expire?
126 struct GNUNET_TIME_Absolute expiration;
131 * Add an address from the 'OwnAddressList' to the buffer.
133 * @param cls the 'struct GeneratorContext'
134 * @param max maximum number of bytes left
135 * @param buf where to write the address
138 address_generator (void *cls, size_t max, void *buf)
140 struct GeneratorContext *gc = cls;
143 if (NULL == gc->addr_pos)
146 GNUNET_HELLO_add_address (gc->addr_pos->address, gc->expiration, buf,
148 gc->addr_pos = gc->addr_pos->next;
154 * Construct our HELLO message from all of the addresses of
155 * all of the transports.
158 * @param tc scheduler context
161 refresh_hello_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
163 struct GeneratorContext gc;
165 hello_task = GNUNET_SCHEDULER_NO_TASK;
166 gc.addr_pos = oal_head;
167 gc.expiration = GNUNET_TIME_relative_to_absolute (hello_expiration);
169 GNUNET_free (our_hello);
170 our_hello = GNUNET_HELLO_create (&GST_my_public_key, &address_generator, &gc);
171 GNUNET_assert (NULL != our_hello);
172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
173 "Refreshed my `%s', new size is %d\n", "HELLO",
174 GNUNET_HELLO_size (our_hello));
175 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# refreshed my HELLO"), 1,
177 if (NULL != hello_cb)
178 hello_cb (hello_cb_cls, GST_hello_get ());
179 GNUNET_PEERINFO_add_peer (GST_peerinfo, our_hello, NULL, NULL);
181 GNUNET_SCHEDULER_add_delayed (HELLO_REFRESH_PERIOD, &refresh_hello_task,
188 * Schedule task to refresh hello (unless such a
189 * task exists already).
194 if (hello_task != GNUNET_SCHEDULER_NO_TASK)
195 GNUNET_SCHEDULER_cancel (hello_task);
196 hello_task = GNUNET_SCHEDULER_add_now (&refresh_hello_task, NULL);
201 * Initialize the HELLO module.
203 * @param cb function to call whenever our HELLO changes
204 * @param cb_cls closure for cb
207 GST_hello_start (GST_HelloCallback cb, void *cb_cls)
210 hello_cb_cls = cb_cls;
211 our_hello = GNUNET_HELLO_create (&GST_my_public_key, NULL, NULL);
212 GNUNET_assert (NULL != our_hello);
218 * Shutdown the HELLO module.
225 if (GNUNET_SCHEDULER_NO_TASK != hello_task)
227 GNUNET_SCHEDULER_cancel (hello_task);
228 hello_task = GNUNET_SCHEDULER_NO_TASK;
230 if (NULL != our_hello)
232 GNUNET_free (our_hello);
239 * Obtain this peers HELLO message.
241 * @return our HELLO message
243 const struct GNUNET_MessageHeader *
246 return (struct GNUNET_MessageHeader *) our_hello;
251 * Add or remove an address from this peer's HELLO message.
253 * @param addremove GNUNET_YES to add, GNUNET_NO to remove
254 * @param address address to add or remove
257 GST_hello_modify_addresses (int addremove,
258 const struct GNUNET_HELLO_Address *address)
260 struct OwnAddressList *al;
262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
264 GNUNET_YES) ? "Adding `%s' to the set of our addresses\n" :
265 "Removing `%s' from the set of our addresses\n",
266 GST_plugins_a2s (address));
267 GNUNET_assert (address != NULL);
268 if (GNUNET_NO == addremove)
270 for (al = oal_head; al != NULL; al = al->next)
271 if (0 == GNUNET_HELLO_address_cmp (address, al->address))
273 GNUNET_CONTAINER_DLL_remove (oal_head, oal_tail, al);
274 GNUNET_HELLO_address_free (al->address);
279 /* address to be removed not found!? */
283 al = GNUNET_malloc (sizeof (struct OwnAddressList));
284 GNUNET_CONTAINER_DLL_insert (oal_head, oal_tail, al);
285 al->address = GNUNET_HELLO_address_copy (address);
291 * Test if a particular address is one of ours.
293 * @param address address to test
294 * @param sig location where to cache PONG signatures for this address [set]
295 * @param sig_expiration how long until the current 'sig' expires?
296 * (ZERO if sig was never created) [set]
297 * @return GNUNET_YES if this is one of our addresses,
301 GST_hello_test_address (const struct GNUNET_HELLO_Address *address,
302 struct GNUNET_CRYPTO_RsaSignature **sig,
303 struct GNUNET_TIME_Absolute **sig_expiration)
305 struct OwnAddressList *al;
307 for (al = oal_head; al != NULL; al = al->next)
308 if (0 == GNUNET_HELLO_address_cmp (address, al->address))
310 *sig = &al->pong_signature;
311 *sig_expiration = &al->pong_sig_expires;
315 *sig_expiration = NULL;
320 /* end of file gnunet-service-transport_hello.c */