2 This file is part of GNUnet.
3 (C) 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
8 option) any later version.
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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file fs/gnunet-service-fs.c
23 * @brief program that provides the file-sharing service
24 * @author Christian Grothoff
27 * - fix gazillion of minor FIXME's
28 * - possible major issue: we may queue "gazillions" of (K|S)Blocks for the
29 * core to transmit to another peer; need to make sure this is bounded overall...
30 * - randomly delay processing for improved anonymity (can wait)
31 * - content migration (put in local DS) (can wait)
32 * - handle some special cases when forwarding replies based on tracked requests (can wait)
33 * - tracking of success correlations for hot-path routing (can wait)
34 * - various load-based actions (can wait)
35 * - validation of KSBLOCKS (can wait)
36 * - remove on-demand blocks if they keep failing (can wait)
37 * - check that we decrement PIDs always where necessary (can wait)
38 * - find out how to use core-pulling instead of pushing (at least for some cases)
42 #include "gnunet_core_service.h"
43 #include "gnunet_datastore_service.h"
44 #include "gnunet_peer_lib.h"
45 #include "gnunet_protocols.h"
46 #include "gnunet_signatures.h"
47 #include "gnunet_util_lib.h"
50 #define DEBUG_FS GNUNET_NO
54 * In-memory information about indexed files (also available
61 * This is a linked list.
63 struct IndexInfo *next;
66 * Name of the indexed file. Memory allocated
67 * at the end of this struct (do not free).
72 * Context for transmitting confirmation to client,
73 * NULL if we've done this already.
75 struct GNUNET_SERVER_TransmitContext *tc;
78 * Hash of the contents of the file.
80 GNUNET_HashCode file_id;
86 * Signature of a function that is called whenever a datastore
87 * request can be processed (or an entry put on the queue times out).
90 * @param ok GNUNET_OK if DS is ready, GNUNET_SYSERR on timeout
92 typedef void (*RequestFunction)(void *cls,
97 * Doubly-linked list of our requests for the datastore.
99 struct DatastoreRequestQueue
103 * This is a doubly-linked list.
105 struct DatastoreRequestQueue *next;
108 * This is a doubly-linked list.
110 struct DatastoreRequestQueue *prev;
113 * Function to call (will issue the request).
123 * When should this request time-out because we don't care anymore?
125 struct GNUNET_TIME_Absolute timeout;
128 * ID of task used for signaling timeout.
130 GNUNET_SCHEDULER_TaskIdentifier task;
136 * Closure for processing START_SEARCH messages from a client.
138 struct LocalGetContext
142 * This is a doubly-linked list.
144 struct LocalGetContext *next;
147 * This is a doubly-linked list.
149 struct LocalGetContext *prev;
152 * Client that initiated the search.
154 struct GNUNET_SERVER_Client *client;
157 * Array of results that we've already received
160 GNUNET_HashCode *results;
163 * Bloomfilter over all results (for fast query construction);
164 * NULL if we don't have any results.
166 * FIXME: this member is not used, is that OK? If so, it should
169 struct GNUNET_CONTAINER_BloomFilter *results_bf;
172 * DS request associated with this operation.
174 struct DatastoreRequestQueue *req;
177 * Current result message to transmit to client (or NULL).
179 struct ContentMessage *result;
182 * Type of the content that we're looking for.
188 * Desired anonymity level.
190 uint32_t anonymity_level;
193 * Number of results actually stored in the results array.
195 unsigned int results_used;
198 * Size of the results array in memory.
200 unsigned int results_size;
203 * Size (in bytes) of the 'results_bf' bloomfilter.
205 * FIXME: this member is not used, is that OK? If so, it should
208 size_t results_bf_size;
211 * If the request is for a DBLOCK or IBLOCK, this is the identity of
212 * the peer that is known to have a response. Set to all-zeros if
213 * such a target is not known (note that even if OUR anonymity
214 * level is >0 we may happen to know the responder's identity;
215 * nevertheless, we should probably not use it for a DHT-lookup
216 * or similar blunt actions in order to avoid exposing ourselves).
218 struct GNUNET_PeerIdentity target;
221 * If the request is for an SBLOCK, this is the identity of the
222 * pseudonym to which the SBLOCK belongs.
224 GNUNET_HashCode namespace;
227 * Hash of the keyword (aka query) for KBLOCKs; Hash of
228 * the CHK-encoded block for DBLOCKS and IBLOCKS (aka query)
229 * and hash of the identifier XORed with the target for
230 * SBLOCKS (aka query).
232 GNUNET_HashCode query;
238 * Possible routing policies for an FS-GET request.
243 * Simply drop the request.
245 ROUTING_POLICY_NONE = 0,
248 * Answer it if we can from local datastore.
250 ROUTING_POLICY_ANSWER = 1,
253 * Forward the request to other peers (if possible).
255 ROUTING_POLICY_FORWARD = 2,
258 * Forward to other peers, and ask them to route
259 * the response via ourselves.
261 ROUTING_POLICY_INDIRECT = 6,
264 * Do everything we could possibly do (that would
267 ROUTING_POLICY_ALL = 7
272 * Internal context we use for our initial processing
275 struct ProcessGetContext
278 * The search query (used for datastore lookup).
280 GNUNET_HashCode query;
283 * Which peer we should forward the response to.
285 struct GNUNET_PeerIdentity reply_to;
288 * Namespace for the result (only set for SKS requests)
290 GNUNET_HashCode namespace;
293 * Peer that we should forward the query to if possible
294 * (since that peer likely has the content).
296 struct GNUNET_PeerIdentity prime_target;
299 * When did we receive this request?
301 struct GNUNET_TIME_Absolute start_time;
304 * Our entry in the DRQ (non-NULL while we wait for our
305 * turn to interact with the local database).
307 struct DatastoreRequestQueue *drq;
310 * Filter used to eliminate duplicate results. Can be NULL if we
311 * are not yet filtering any results.
313 struct GNUNET_CONTAINER_BloomFilter *bf;
316 * Bitmap describing which of the optional
317 * hash codes / peer identities were given to us.
322 * Desired block type.
327 * Priority of the request.
332 * Size of the 'bf' (in bytes).
337 * In what ways are we going to process
340 enum RoutingPolicy policy;
343 * Time-to-live for the request (value
349 * Number to mingle hashes for bloom-filter
355 * Number of results that were found so far.
357 unsigned int results_found;
362 * Information we keep for each pending reply.
367 * This is a linked list.
369 struct PendingReply *next;
372 * Size of the reply; actual reply message follows
373 * at the end of this struct.
381 * All requests from a client are kept in a doubly-linked list.
383 struct ClientRequestList;
387 * Information we keep for each pending request. We should try to
388 * keep this struct as small as possible since its memory consumption
389 * is key to how many requests we can have pending at once.
391 struct PendingRequest
395 * ID of a client making a request, NULL if this entry is for a
398 struct GNUNET_SERVER_Client *client;
401 * If this request was made by a client,
402 * this is our entry in the client request
403 * list; otherwise NULL.
405 struct ClientRequestList *crl_entry;
408 * If this is a namespace query, pointer to the hash of the public
409 * key of the namespace; otherwise NULL.
411 GNUNET_HashCode *namespace;
414 * Bloomfilter we use to filter out replies that we don't care about
415 * (anymore). NULL as long as we are interested in all replies.
417 struct GNUNET_CONTAINER_BloomFilter *bf;
420 * Replies that we have received but were unable to forward yet
421 * (typically non-null only if we have a pending transmission
422 * request with the client or the respective peer).
424 struct PendingReply *replies_pending;
427 * Pending transmission request with the core service for the target
428 * peer (for processing of 'replies_pending') or Handle for a
429 * pending query-request for P2P-transmission with the core service.
430 * If non-NULL, this request must be cancelled should this struct be
433 struct GNUNET_CORE_TransmitHandle *cth;
436 * Pending transmission request for the target client (for processing of
437 * 'replies_pending').
439 struct GNUNET_CONNECTION_TransmitHandle *th;
442 * Hash code of all replies that we have seen so far (only valid
443 * if client is not NULL since we only track replies like this for
446 GNUNET_HashCode *replies_seen;
449 * When did we first see this request (form this peer), or, if our
450 * client is initiating, when did we last initiate a search?
452 struct GNUNET_TIME_Absolute start_time;
455 * The query that this request is for.
457 GNUNET_HashCode query;
460 * The task responsible for transmitting queries
463 GNUNET_SCHEDULER_TaskIdentifier task;
466 * (Interned) Peer identifier (only valid if "client" is NULL)
467 * that identifies a peer that gave us this request.
469 GNUNET_PEER_Id source_pid;
472 * (Interned) Peer identifier that identifies a preferred target
475 GNUNET_PEER_Id target_pid;
478 * (Interned) Peer identifiers of peers that have already
479 * received our query for this content.
481 GNUNET_PEER_Id *used_pids;
484 * Size of the 'bf' (in bytes).
489 * Desired anonymity level; only valid for requests from a local client.
491 uint32_t anonymity_level;
494 * How many entries in "used_pids" are actually valid?
496 unsigned int used_pids_off;
499 * How long is the "used_pids" array?
501 unsigned int used_pids_size;
504 * How many entries in "replies_seen" are actually valid?
506 unsigned int replies_seen_off;
509 * How long is the "replies_seen" array?
511 unsigned int replies_seen_size;
514 * Priority with which this request was made. If one of our clients
515 * made the request, then this is the current priority that we are
516 * using when initiating the request. This value is used when
517 * we decide to reward other peers with trust for providing a reply.
522 * Priority points left for us to spend when forwarding this request
525 uint32_t remaining_priority;
528 * Number to mingle hashes for bloom-filter
534 * TTL with which we saw this request (or, if we initiated, TTL that
535 * we used for the request).
540 * Type of the content that this request is for.
548 * All requests from a client are kept in a doubly-linked list.
550 struct ClientRequestList
553 * This is a doubly-linked list.
555 struct ClientRequestList *next;
558 * This is a doubly-linked list.
560 struct ClientRequestList *prev;
563 * A request from this client.
565 struct PendingRequest *req;
568 * Client list with the head and tail of this DLL.
570 struct ClientList *cl;
575 * Linked list of all clients that we are
576 * currently processing requests for.
582 * This is a linked list.
584 struct ClientList *next;
587 * What client is this entry for?
589 struct GNUNET_SERVER_Client* client;
592 * Head of the DLL of requests from this client.
594 struct ClientRequestList *head;
597 * Tail of the DLL of requests from this client.
599 struct ClientRequestList *tail;
605 * Closure for "process_reply" function.
607 struct ProcessReplyClosure
610 * The data for the reply.
615 * When the reply expires.
617 struct GNUNET_TIME_Absolute expiration;
625 * Namespace that this reply belongs to
626 * (if it is of type SBLOCK).
628 GNUNET_HashCode namespace;
636 * How much was this reply worth to us?
643 * Information about a peer that we are connected to.
644 * We track data that is useful for determining which
645 * peers should receive our requests.
651 * List of the last clients for which this peer
652 * successfully answered a query.
654 struct GNUNET_SERVER_Client *last_client_replies[CS2P_SUCCESS_LIST_SIZE];
657 * List of the last PIDs for which
658 * this peer successfully answered a query;
659 * We use 0 to indicate no successful reply.
661 GNUNET_PEER_Id last_p2p_replies[P2P_SUCCESS_LIST_SIZE];
664 * Average delay between sending the peer a request and
665 * getting a reply (only calculated over the requests for
666 * which we actually got a reply). Calculated
667 * as a moving average: new_delay = ((n-1)*last_delay+curr_delay) / n
669 struct GNUNET_TIME_Relative avg_delay;
672 * Average priority of successful replies. Calculated
673 * as a moving average: new_avg = ((n-1)*last_avg+curr_prio) / n
678 * The peer's identity.
683 * Number of requests we have currently pending
684 * with this peer (that is, requests that were
685 * transmitted so recently that we would not retransmit
688 unsigned int pending_requests;
691 * Which offset in "last_p2p_replies" will be updated next?
692 * (we go round-robin).
694 unsigned int last_p2p_replies_woff;
697 * Which offset in "last_client_replies" will be updated next?
698 * (we go round-robin).
700 unsigned int last_client_replies_woff;
706 * Our connection to the datastore.
708 static struct GNUNET_DATASTORE_Handle *dsh;
713 static struct GNUNET_SCHEDULER_Handle *sched;
718 const struct GNUNET_CONFIGURATION_Handle *cfg;
721 * Handle to the core service (NULL until we've connected to it).
723 struct GNUNET_CORE_Handle *core;
726 * Head of doubly-linked LGC list.
728 static struct LocalGetContext *lgc_head;
731 * Tail of doubly-linked LGC list.
733 static struct LocalGetContext *lgc_tail;
736 * Head of request queue for the datastore, sorted by timeout.
738 static struct DatastoreRequestQueue *drq_head;
741 * Tail of request queue for the datastore.
743 static struct DatastoreRequestQueue *drq_tail;
746 * Linked list of indexed files.
748 static struct IndexInfo *indexed_files;
751 * Maps hash over content of indexed files to the respective filename.
752 * The filenames are pointers into the indexed_files linked list and
753 * do not need to be freed.
755 static struct GNUNET_CONTAINER_MultiHashMap *ifm;
758 * Map of query hash codes to requests.
760 static struct GNUNET_CONTAINER_MultiHashMap *requests_by_query;
763 * Map of peer IDs to requests (for those requests coming
766 static struct GNUNET_CONTAINER_MultiHashMap *requests_by_peer;
769 * Linked list of all of our clients and their requests.
771 static struct ClientList *clients;
774 * Heap with the request that will expire next at the top. Contains
775 * pointers of type "struct PendingRequest*"; these will *also* be
776 * aliased from the "requests_by_peer" data structures and the
777 * "requests_by_query" table. Note that requests from our clients
778 * don't expire and are thus NOT in the "requests_by_expiration"
779 * (or the "requests_by_peer" tables).
781 static struct GNUNET_CONTAINER_Heap *requests_by_expiration;
784 * Map of peer identifiers to "struct ConnectedPeer" (for that peer).
786 static struct GNUNET_CONTAINER_MultiHashMap *connected_peers;
789 * Maximum number of requests (from other peers) that we're
790 * willing to have pending at any given point in time.
791 * FIXME: set from configuration (and 32 is a tiny value for testing only).
793 static uint64_t max_pending_requests = 32;
796 * Write the current index information list to disk.
801 struct GNUNET_BIO_WriteHandle *wh;
803 struct IndexInfo *pos;
806 GNUNET_CONFIGURATION_get_value_filename (cfg,
811 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
812 _("Configuration option `%s' in section `%s' missing.\n"),
817 wh = GNUNET_BIO_write_open (fn);
820 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
821 _("Could not open `%s'.\n"),
830 GNUNET_BIO_write (wh,
832 sizeof (GNUNET_HashCode))) ||
834 GNUNET_BIO_write_string (wh,
840 GNUNET_BIO_write_close (wh))
842 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
843 _("Error writing `%s'.\n"),
853 * Read index information from disk.
858 struct GNUNET_BIO_ReadHandle *rh;
860 struct IndexInfo *pos;
867 GNUNET_CONFIGURATION_get_value_filename (cfg,
872 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
873 _("Configuration option `%s' in section `%s' missing.\n"),
878 if (GNUNET_NO == GNUNET_DISK_file_test (fn))
880 /* no index info yet */
884 rh = GNUNET_BIO_read_open (fn);
887 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
888 _("Could not open `%s'.\n"),
894 while ( (GNUNET_OK ==
896 "Hash of indexed file",
898 sizeof (GNUNET_HashCode))) &&
900 GNUNET_BIO_read_string (rh,
901 "Name of indexed file",
905 slen = strlen (fname) + 1;
906 pos = GNUNET_malloc (sizeof (struct IndexInfo) + slen);
908 pos->filename = (const char *) &pos[1];
909 memcpy (&pos[1], fname, slen);
911 GNUNET_CONTAINER_multihashmap_put (ifm,
913 (void*) pos->filename,
914 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
920 pos->next = indexed_files;
926 GNUNET_BIO_read_close (rh, &emsg))
933 * We've validated the hash of the file we're about to
934 * index. Signal success to the client and update
935 * our internal data structures.
937 * @param ii the index info entry for the request
940 signal_index_ok (struct IndexInfo *ii)
943 GNUNET_CONTAINER_multihashmap_put (ifm,
945 (void*) ii->filename,
946 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
948 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
949 _("Index request received for file `%s' is indexed as `%s'. Permitting anyway.\n"),
951 (const char*) GNUNET_CONTAINER_multihashmap_get (ifm,
953 GNUNET_SERVER_transmit_context_append (ii->tc,
955 GNUNET_MESSAGE_TYPE_FS_INDEX_START_OK);
956 GNUNET_SERVER_transmit_context_run (ii->tc,
957 GNUNET_TIME_UNIT_MINUTES);
961 ii->next = indexed_files;
964 GNUNET_SERVER_transmit_context_append (ii->tc,
966 GNUNET_MESSAGE_TYPE_FS_INDEX_START_OK);
967 GNUNET_SERVER_transmit_context_run (ii->tc,
968 GNUNET_TIME_UNIT_MINUTES);
974 * Function called once the hash computation over an
975 * indexed file has completed.
977 * @param cls closure, our publishing context
978 * @param res resulting hash, NULL on error
981 hash_for_index_val (void *cls,
982 const GNUNET_HashCode *
985 struct IndexInfo *ii = cls;
987 if ( (res == NULL) ||
990 sizeof(GNUNET_HashCode))) )
992 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
993 _("Hash mismatch trying to index file `%s' which has hash `%s'\n"),
997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
999 GNUNET_h2s (&ii->file_id));
1001 GNUNET_SERVER_transmit_context_append (ii->tc,
1003 GNUNET_MESSAGE_TYPE_FS_INDEX_START_FAILED);
1004 GNUNET_SERVER_transmit_context_run (ii->tc,
1005 GNUNET_TIME_UNIT_MINUTES);
1009 signal_index_ok (ii);
1014 * Handle INDEX_START-message.
1016 * @param cls closure
1017 * @param client identification of the client
1018 * @param message the actual message
1021 handle_index_start (void *cls,
1022 struct GNUNET_SERVER_Client *client,
1023 const struct GNUNET_MessageHeader *message)
1025 const struct IndexStartMessage *ism;
1028 struct IndexInfo *ii;
1035 msize = ntohs(message->size);
1036 if ( (msize <= sizeof (struct IndexStartMessage)) ||
1037 ( ((const char *)message)[msize-1] != '\0') )
1040 GNUNET_SERVER_receive_done (client,
1044 ism = (const struct IndexStartMessage*) message;
1045 fn = (const char*) &ism[1];
1046 dev = ntohl (ism->device);
1047 ino = GNUNET_ntohll (ism->inode);
1048 ism = (const struct IndexStartMessage*) message;
1049 slen = strlen (fn) + 1;
1050 ii = GNUNET_malloc (sizeof (struct IndexInfo) + slen);
1051 ii->filename = (const char*) &ii[1];
1052 memcpy (&ii[1], fn, slen);
1053 ii->file_id = ism->file_id;
1054 ii->tc = GNUNET_SERVER_transmit_context_create (client);
1055 if ( ( (dev != 0) ||
1057 (GNUNET_OK == GNUNET_DISK_file_get_identifiers (fn,
1063 /* fast validation OK! */
1064 signal_index_ok (ii);
1068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1069 "Mismatch in file identifiers (%llu != %llu or %u != %u), need to hash.\n",
1070 (unsigned long long) ino,
1071 (unsigned long long) myino,
1073 (unsigned int) mydev);
1075 /* slow validation, need to hash full file (again) */
1076 GNUNET_CRYPTO_hash_file (sched,
1077 GNUNET_SCHEDULER_PRIORITY_IDLE,
1080 &hash_for_index_val,
1086 * Handle INDEX_LIST_GET-message.
1088 * @param cls closure
1089 * @param client identification of the client
1090 * @param message the actual message
1093 handle_index_list_get (void *cls,
1094 struct GNUNET_SERVER_Client *client,
1095 const struct GNUNET_MessageHeader *message)
1097 struct GNUNET_SERVER_TransmitContext *tc;
1098 struct IndexInfoMessage *iim;
1099 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1102 struct GNUNET_MessageHeader *msg;
1103 struct IndexInfo *pos;
1105 tc = GNUNET_SERVER_transmit_context_create (client);
1106 iim = (struct IndexInfoMessage*) buf;
1108 pos = indexed_files;
1112 iim->file_id = pos->file_id;
1114 slen = strlen (fn) + 1;
1115 if (slen + sizeof (struct IndexInfoMessage) >
1116 GNUNET_SERVER_MAX_MESSAGE_SIZE)
1121 memcpy (&iim[1], fn, slen);
1122 GNUNET_SERVER_transmit_context_append
1125 sizeof (struct IndexInfoMessage)
1126 - sizeof (struct GNUNET_MessageHeader) + slen,
1127 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY);
1130 GNUNET_SERVER_transmit_context_append (tc,
1132 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_END);
1133 GNUNET_SERVER_transmit_context_run (tc,
1134 GNUNET_TIME_UNIT_MINUTES);
1139 * Handle UNINDEX-message.
1141 * @param cls closure
1142 * @param client identification of the client
1143 * @param message the actual message
1146 handle_unindex (void *cls,
1147 struct GNUNET_SERVER_Client *client,
1148 const struct GNUNET_MessageHeader *message)
1150 const struct UnindexMessage *um;
1151 struct IndexInfo *pos;
1152 struct IndexInfo *prev;
1153 struct IndexInfo *next;
1154 struct GNUNET_SERVER_TransmitContext *tc;
1157 um = (const struct UnindexMessage*) message;
1160 pos = indexed_files;
1164 if (0 == memcmp (&pos->file_id,
1166 sizeof (GNUNET_HashCode)))
1169 indexed_files = pos->next;
1171 prev->next = pos->next;
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Client requested unindexing of file `%s': %s\n",
1184 GNUNET_h2s (&um->file_id),
1185 found ? "found" : "not found");
1187 if (GNUNET_YES == found)
1188 write_index_list ();
1189 tc = GNUNET_SERVER_transmit_context_create (client);
1190 GNUNET_SERVER_transmit_context_append (tc,
1192 GNUNET_MESSAGE_TYPE_FS_UNINDEX_OK);
1193 GNUNET_SERVER_transmit_context_run (tc,
1194 GNUNET_TIME_UNIT_MINUTES);
1199 * Run the next DS request in our
1200 * queue, we're done with the current one.
1205 struct DatastoreRequestQueue *e;
1207 while (NULL != (e = drq_head))
1209 if (0 != GNUNET_TIME_absolute_get_remaining (e->timeout).value)
1211 if (e->task != GNUNET_SCHEDULER_NO_TASK)
1212 GNUNET_SCHEDULER_cancel (sched, e->task);
1213 GNUNET_CONTAINER_DLL_remove (drq_head, drq_tail, e);
1214 e->req (e->req_cls, GNUNET_NO);
1219 if (e->task != GNUNET_SCHEDULER_NO_TASK)
1220 GNUNET_SCHEDULER_cancel (sched, e->task);
1221 e->task = GNUNET_SCHEDULER_NO_TASK;
1222 e->req (e->req_cls, GNUNET_YES);
1223 GNUNET_CONTAINER_DLL_remove (drq_head, drq_tail, e);
1229 * A datastore request had to be timed out.
1231 * @param cls closure (of type "struct DatastoreRequestQueue*")
1232 * @param tc task context, unused
1235 timeout_ds_request (void *cls,
1236 const struct GNUNET_SCHEDULER_TaskContext *tc)
1238 struct DatastoreRequestQueue *e = cls;
1240 e->task = GNUNET_SCHEDULER_NO_TASK;
1241 GNUNET_CONTAINER_DLL_remove (drq_head, drq_tail, e);
1242 e->req (e->req_cls, GNUNET_NO);
1248 * Queue a request for the datastore.
1250 * @param deadline by when the request should run
1251 * @param fun function to call once the request can be run
1252 * @param fun_cls closure for fun
1254 static struct DatastoreRequestQueue *
1255 queue_ds_request (struct GNUNET_TIME_Relative deadline,
1256 RequestFunction fun,
1259 struct DatastoreRequestQueue *e;
1260 struct DatastoreRequestQueue *bef;
1262 if (drq_head == NULL)
1264 /* no other requests pending, run immediately */
1265 fun (fun_cls, GNUNET_OK);
1268 e = GNUNET_malloc (sizeof (struct DatastoreRequestQueue));
1269 e->timeout = GNUNET_TIME_relative_to_absolute (deadline);
1271 e->req_cls = fun_cls;
1272 if (deadline.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
1274 /* local request, highest prio, put at head of queue
1275 regardless of deadline */
1281 while ( (NULL != bef) &&
1282 (e->timeout.value < bef->timeout.value) )
1285 GNUNET_CONTAINER_DLL_insert_after (drq_head, drq_tail, bef, e);
1286 if (deadline.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
1288 e->task = GNUNET_SCHEDULER_add_delayed (sched,
1290 &timeout_ds_request,
1297 * Free the state associated with a local get context.
1299 * @param lgc the lgc to free
1302 local_get_context_free (struct LocalGetContext *lgc)
1304 GNUNET_CONTAINER_DLL_remove (lgc_head, lgc_tail, lgc);
1305 GNUNET_SERVER_client_drop (lgc->client);
1306 GNUNET_free_non_null (lgc->results);
1307 if (lgc->results_bf != NULL)
1308 GNUNET_CONTAINER_bloomfilter_free (lgc->results_bf);
1309 if (lgc->req != NULL)
1311 if (lgc->req->task != GNUNET_SCHEDULER_NO_TASK)
1312 GNUNET_SCHEDULER_cancel (sched, lgc->req->task);
1313 GNUNET_CONTAINER_DLL_remove (lgc_head, lgc_tail, lgc);
1314 GNUNET_free (lgc->req);
1321 * We're able to transmit the next (local) result to the client.
1322 * Do it and ask the datastore for more. Or, on error, tell
1323 * the datastore to stop giving us more.
1325 * @param cls our closure (struct LocalGetContext)
1326 * @param max maximum number of bytes we can transmit
1327 * @param buf where to copy our message
1328 * @return number of bytes copied to buf
1331 transmit_local_result (void *cls,
1335 struct LocalGetContext *lgc = cls;
1341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1342 "Failed to transmit result to local client, aborting datastore iteration.\n");
1345 GNUNET_free (lgc->result);
1347 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
1350 msize = ntohs (lgc->result->header.size);
1352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1353 "Transmitting %u bytes of result to local client.\n",
1356 GNUNET_assert (max >= msize);
1357 memcpy (buf, lgc->result, msize);
1358 GNUNET_free (lgc->result);
1360 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1366 * Continuation called from datastore's remove
1370 * @param success did the deletion work?
1371 * @param msg error message
1374 remove_cont (void *cls,
1378 if (GNUNET_OK != success)
1379 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1380 _("Failed to delete bogus block: %s\n"),
1382 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1387 * Mingle hash with the mingle_number to
1388 * produce different bits.
1391 mingle_hash (const GNUNET_HashCode * in,
1392 int32_t mingle_number,
1393 GNUNET_HashCode * hc)
1397 GNUNET_CRYPTO_hash (&mingle_number,
1400 GNUNET_CRYPTO_hash_xor (&m, in, hc);
1405 * We've received an on-demand encoded block
1406 * from the datastore. Attempt to do on-demand
1407 * encoding and (if successful), call the
1408 * continuation with the resulting block. On
1409 * error, clean up and ask the datastore for
1412 * @param key key for the content
1413 * @param size number of bytes in data
1414 * @param data content stored
1415 * @param type type of the content
1416 * @param priority priority of the content
1417 * @param anonymity anonymity-level for the content
1418 * @param expiration expiration time for the content
1419 * @param uid unique identifier for the datum;
1420 * maybe 0 if no unique identifier is available
1421 * @param cont function to call with the actual block
1422 * @param cont_cls closure for cont
1425 handle_on_demand_block (const GNUNET_HashCode * key,
1431 struct GNUNET_TIME_Absolute
1432 expiration, uint64_t uid,
1433 GNUNET_DATASTORE_Iterator cont,
1436 const struct OnDemandBlock *odb;
1437 GNUNET_HashCode nkey;
1438 struct GNUNET_CRYPTO_AesSessionKey skey;
1439 struct GNUNET_CRYPTO_AesInitializationVector iv;
1440 GNUNET_HashCode query;
1442 char ndata[DBLOCK_SIZE];
1443 char edata[DBLOCK_SIZE];
1445 struct GNUNET_DISK_FileHandle *fh;
1448 if (size != sizeof (struct OnDemandBlock))
1451 GNUNET_DATASTORE_remove (dsh,
1457 GNUNET_TIME_UNIT_FOREVER_REL);
1460 odb = (const struct OnDemandBlock*) data;
1461 off = GNUNET_ntohll (odb->offset);
1462 fn = (const char*) GNUNET_CONTAINER_multihashmap_get (ifm,
1465 if ( (NULL == fn) ||
1466 (NULL == (fh = GNUNET_DISK_file_open (fn,
1467 GNUNET_DISK_OPEN_READ,
1468 GNUNET_DISK_PERM_NONE))) ||
1470 GNUNET_DISK_file_seek (fh,
1472 GNUNET_DISK_SEEK_SET)) ||
1474 (nsize = GNUNET_DISK_file_read (fh,
1478 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1479 _("Could not access indexed file `%s' at offset %llu: %s\n"),
1480 GNUNET_h2s (&odb->file_id),
1481 (unsigned long long) off,
1484 GNUNET_DISK_file_close (fh);
1485 /* FIXME: if this happens often, we need
1486 to remove the OnDemand block from the DS! */
1487 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1490 GNUNET_DISK_file_close (fh);
1491 GNUNET_CRYPTO_hash (ndata,
1494 GNUNET_CRYPTO_hash_to_aes_key (&nkey, &skey, &iv);
1495 GNUNET_CRYPTO_aes_encrypt (ndata,
1500 GNUNET_CRYPTO_hash (edata,
1503 if (0 != memcmp (&query,
1505 sizeof (GNUNET_HashCode)))
1507 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1508 _("Indexed file `%s' changed at offset %llu\n"),
1510 (unsigned long long) off);
1511 /* FIXME: if this happens often, we need
1512 to remove the OnDemand block from the DS! */
1513 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
1520 GNUNET_DATASTORE_BLOCKTYPE_DBLOCK,
1529 * How many bytes should a bloomfilter be if we have already seen
1530 * entry_count responses? Note that BLOOMFILTER_K gives us the number
1531 * of bits set per entry. Furthermore, we should not re-size the
1532 * filter too often (to keep it cheap).
1534 * Since other peers will also add entries but not resize the filter,
1535 * we should generally pick a slightly larger size than what the
1536 * strict math would suggest.
1538 * @return must be a power of two and smaller or equal to 2^15.
1541 compute_bloomfilter_size (unsigned int entry_count)
1544 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
1545 uint16_t max = 1 << 15;
1547 if (entry_count > max)
1550 while ((size < max) && (size < ideal))
1559 * Recalculate our bloom filter for filtering replies.
1561 * @param count number of entries we are filtering right now
1562 * @param mingle set to our new mingling value
1563 * @param bf_size set to the size of the bloomfilter
1564 * @param entries the entries to filter
1565 * @return updated bloomfilter, NULL for none
1567 static struct GNUNET_CONTAINER_BloomFilter *
1568 refresh_bloomfilter (unsigned int count,
1571 const GNUNET_HashCode *entries)
1573 struct GNUNET_CONTAINER_BloomFilter *bf;
1576 GNUNET_HashCode mhash;
1580 nsize = compute_bloomfilter_size (count);
1581 *mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1);
1583 bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
1586 for (i=0;i<count;i++)
1588 mingle_hash (&entries[i], *mingle, &mhash);
1589 GNUNET_CONTAINER_bloomfilter_add (bf, &mhash);
1596 * Closure used for "target_peer_select_cb".
1598 struct PeerSelectionContext
1601 * The request for which we are selecting
1604 struct PendingRequest *pr;
1607 * Current "prime" target.
1609 struct GNUNET_PeerIdentity target;
1612 * How much do we like this target?
1614 double target_score;
1620 * Function called for each connected peer to determine
1621 * which one(s) would make good targets for forwarding.
1623 * @param cls closure (struct PeerSelectionContext)
1624 * @param key current key code (peer identity)
1625 * @param value value in the hash map (struct ConnectedPeer)
1626 * @return GNUNET_YES if we should continue to
1631 target_peer_select_cb (void *cls,
1632 const GNUNET_HashCode * key,
1635 struct PeerSelectionContext *psc = cls;
1636 struct ConnectedPeer *cp = value;
1637 struct PendingRequest *pr = psc->pr;
1641 /* 1) check if we have already (recently) forwarded to this peer */
1642 for (i=0;i<pr->used_pids_off;i++)
1643 if (pr->used_pids[i] == cp->pid)
1644 return GNUNET_YES; /* skip */
1645 // 2) calculate how much we'd like to forward to this peer
1646 score = 0; // FIXME!
1648 /* store best-fit in closure */
1649 if (score > psc->target_score)
1651 psc->target_score = score;
1652 psc->target.hashPubKey = *key;
1659 * We use a random delay to make the timing of requests
1660 * less predictable. This function returns such a random
1663 * @return random delay to use for some request, between 0 and TTL_DECREMENT ms
1665 static struct GNUNET_TIME_Relative
1666 get_processing_delay ()
1668 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1669 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1675 * Task that is run for each request with the
1676 * goal of forwarding the associated query to
1677 * other peers. The task should re-schedule
1678 * itself to be re-run once the TTL has expired.
1679 * (or at a later time if more peers should
1680 * be queried earlier).
1682 * @param cls the requests "struct PendingRequest*"
1683 * @param tc task context (unused)
1686 forward_request_task (void *cls,
1687 const struct GNUNET_SCHEDULER_TaskContext *tc);
1691 * We've selected a peer for forwarding of a query.
1692 * Construct the message and then re-schedule the
1693 * task to forward again to (other) peers.
1695 * @param cls closure
1696 * @param size number of bytes available in buf
1697 * @param buf where the callee should write the message
1698 * @return number of bytes written to buf
1701 transmit_request_cb (void *cls,
1705 struct PendingRequest *pr = cls;
1706 struct GetMessage *gm;
1707 GNUNET_HashCode *ext;
1713 /* (1) check for timeout */
1716 /* timeout, try another peer immediately again */
1717 pr->task = GNUNET_SCHEDULER_add_with_priority (sched,
1718 GNUNET_SCHEDULER_PRIORITY_IDLE,
1719 &forward_request_task,
1723 /* (2) build query message */
1724 k = 0; // FIXME: count hash codes!
1725 msize = sizeof (struct GetMessage) + pr->bf_size + k * sizeof(GNUNET_HashCode);
1726 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1727 gm = (struct GetMessage*) buf;
1728 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
1729 gm->header.size = htons (msize);
1730 gm->type = htonl (pr->type);
1731 pr->remaining_priority /= 2;
1732 gm->priority = htonl (pr->remaining_priority);
1733 gm->ttl = htonl (pr->ttl);
1734 gm->filter_mutator = htonl(pr->mingle);
1735 gm->hash_bitmap = htonl (42);
1736 gm->query = pr->query;
1737 ext = (GNUNET_HashCode*) &gm[1];
1738 // FIXME: setup "ext[0]..[k-1]"
1739 bfdata = (char *) &ext[k];
1741 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
1745 /* (3) schedule job to do it again (or another peer, etc.) */
1746 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1747 get_processing_delay (), // FIXME!
1748 &forward_request_task,
1756 * Function called after we've tried to reserve
1757 * a certain amount of bandwidth for a reply.
1758 * Check if we succeeded and if so send our query.
1760 * @param cls the requests "struct PendingRequest*"
1761 * @param peer identifies the peer
1762 * @param latency current latency estimate, "FOREVER" if we have been
1764 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
1765 * @param bpm_out set to the current bandwidth limit (sending) for this peer
1766 * @param amount set to the amount that was actually reserved or unreserved
1767 * @param preference current traffic preference for the given peer
1770 target_reservation_cb (void *cls,
1772 GNUNET_PeerIdentity * peer,
1773 unsigned int bpm_in,
1774 unsigned int bpm_out,
1775 struct GNUNET_TIME_Relative
1776 latency, int amount,
1777 unsigned long long preference)
1779 struct PendingRequest *pr = cls;
1782 struct GNUNET_TIME_Relative maxdelay;
1784 GNUNET_assert (peer != NULL);
1785 if ( (amount != DBLOCK_SIZE) ||
1788 /* try again later; FIXME: we may need to un-reserve "amount"? */
1789 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1790 get_processing_delay (), // FIXME: longer?
1791 &forward_request_task,
1795 // (2) transmit, update ttl/priority
1796 // FIXME: calculate priority, maxdelay, size properly!
1799 maxdelay = GNUNET_CONSTANTS_SERVICE_TIMEOUT;
1800 pr->cth = GNUNET_CORE_notify_transmit_ready (core,
1805 &transmit_request_cb,
1807 if (pr->cth == NULL)
1809 /* try again later */
1810 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1811 get_processing_delay (), // FIXME: longer?
1812 &forward_request_task,
1819 * Task that is run for each request with the
1820 * goal of forwarding the associated query to
1821 * other peers. The task should re-schedule
1822 * itself to be re-run once the TTL has expired.
1823 * (or at a later time if more peers should
1824 * be queried earlier).
1826 * @param cls the requests "struct PendingRequest*"
1827 * @param tc task context (unused)
1830 forward_request_task (void *cls,
1831 const struct GNUNET_SCHEDULER_TaskContext *tc)
1833 struct PendingRequest *pr = cls;
1834 struct PeerSelectionContext psc;
1836 pr->task = GNUNET_SCHEDULER_NO_TASK;
1837 if (pr->cth != NULL)
1839 /* we're busy transmitting a result, wait a bit */
1840 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1841 get_processing_delay (),
1842 &forward_request_task,
1846 /* (1) select target */
1848 psc.target_score = DBL_MIN;
1849 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1850 &target_peer_select_cb,
1852 if (psc.target_score == DBL_MIN)
1854 /* no possible target found, wait some time */
1855 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1856 get_processing_delay (), // FIXME: exponential back-off? or at least wait longer...
1857 &forward_request_task,
1861 /* (2) reserve reply bandwidth */
1862 // FIXME: need a way to cancel; this
1863 // async operation is problematic (segv-problematic)
1864 // if "pr" is destroyed while it happens!
1865 GNUNET_CORE_peer_configure (core,
1867 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1869 DBLOCK_SIZE, // FIXME: make dependent on type?
1871 &target_reservation_cb,
1877 * We're processing (local) results for a search request
1878 * from a (local) client. Pass applicable results to the
1879 * client and if we are done either clean up (operation
1880 * complete) or switch to P2P search (more results possible).
1882 * @param cls our closure (struct LocalGetContext)
1883 * @param key key for the content
1884 * @param size number of bytes in data
1885 * @param data content stored
1886 * @param type type of the content
1887 * @param priority priority of the content
1888 * @param anonymity anonymity-level for the content
1889 * @param expiration expiration time for the content
1890 * @param uid unique identifier for the datum;
1891 * maybe 0 if no unique identifier is available
1894 process_local_get_result (void *cls,
1895 const GNUNET_HashCode * key,
1901 struct GNUNET_TIME_Absolute
1905 struct LocalGetContext *lgc = cls;
1906 struct PendingRequest *pr;
1907 struct ClientRequestList *crl;
1908 struct ClientList *cl;
1915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1916 "Received last result for `%s' from local datastore, deciding what to do next.\n",
1917 GNUNET_h2s (&lgc->query));
1919 /* no further results from datastore; continue
1920 processing further requests from the client and
1921 allow the next task to use the datastore; also,
1922 switch to P2P requests or clean up our state. */
1924 GNUNET_SERVER_receive_done (lgc->client,
1926 if ( (lgc->results_used == 0) ||
1927 (lgc->type == GNUNET_DATASTORE_BLOCKTYPE_KBLOCK) ||
1928 (lgc->type == GNUNET_DATASTORE_BLOCKTYPE_SBLOCK) ||
1929 (lgc->type == GNUNET_DATASTORE_BLOCKTYPE_SKBLOCK) )
1932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1933 "Forwarding query for `%s' to network.\n",
1934 GNUNET_h2s (&lgc->query));
1937 while ( (NULL != cl) &&
1938 (cl->client != lgc->client) )
1942 cl = GNUNET_malloc (sizeof (struct ClientList));
1943 cl->client = lgc->client;
1947 crl = GNUNET_malloc (sizeof (struct ClientRequestList));
1949 GNUNET_CONTAINER_DLL_insert (cl->head, cl->tail, crl);
1950 pr = GNUNET_malloc (sizeof (struct PendingRequest));
1951 pr->client = lgc->client;
1952 GNUNET_SERVER_client_keep (pr->client);
1953 pr->crl_entry = crl;
1955 if (lgc->type == GNUNET_DATASTORE_BLOCKTYPE_SBLOCK)
1957 pr->namespace = GNUNET_malloc (sizeof (GNUNET_HashCode));
1958 *pr->namespace = lgc->namespace;
1960 pr->replies_seen = lgc->results;
1961 lgc->results = NULL;
1962 pr->start_time = GNUNET_TIME_absolute_get ();
1963 pr->query = lgc->query;
1964 pr->target_pid = GNUNET_PEER_intern (&lgc->target);
1965 pr->replies_seen_off = lgc->results_used;
1966 pr->replies_seen_size = lgc->results_size;
1967 lgc->results_size = 0;
1968 pr->type = lgc->type;
1969 pr->anonymity_level = lgc->anonymity_level;
1970 pr->bf = refresh_bloomfilter (pr->replies_seen_off,
1974 GNUNET_CONTAINER_multihashmap_put (requests_by_query,
1977 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1978 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1979 get_processing_delay (),
1980 &forward_request_task,
1982 local_get_context_free (lgc);
1985 /* got all possible results, clean up! */
1987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1988 "Found all possible results for query for `%s', done!\n",
1989 GNUNET_h2s (&lgc->query));
1991 local_get_context_free (lgc);
1994 if (type == GNUNET_DATASTORE_BLOCKTYPE_ONDEMAND)
1997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1998 "Received on-demand block for `%s' from local datastore, fetching data.\n",
1999 GNUNET_h2s (&lgc->query));
2001 handle_on_demand_block (key, size, data, type, priority,
2002 anonymity, expiration, uid,
2003 &process_local_get_result,
2007 if ( (type != lgc->type) &&
2008 (lgc->type != GNUNET_DATASTORE_BLOCKTYPE_ANY) )
2010 /* this should be virtually impossible to reach (DBLOCK
2011 query hash being identical to KBLOCK/SBLOCK query hash);
2012 nevertheless, if it happens, the correct thing is to
2013 simply skip the result. */
2015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2016 "Received block of unexpected type (%u, want %u) for `%s' from local datastore, ignoring.\n",
2019 GNUNET_h2s (&lgc->query));
2021 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2024 /* check if this is a result we've alredy
2026 for (i=0;i<lgc->results_used;i++)
2027 if (0 == memcmp (key,
2029 sizeof (GNUNET_HashCode)))
2032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2033 "Received duplicate result for `%s' from local datastore, ignoring.\n",
2034 GNUNET_h2s (&lgc->query));
2036 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2039 if (lgc->results_used == lgc->results_size)
2040 GNUNET_array_grow (lgc->results,
2042 lgc->results_size * 2 + 2);
2043 GNUNET_CRYPTO_hash (data,
2045 &lgc->results[lgc->results_used++]);
2046 msize = size + sizeof (struct ContentMessage);
2047 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
2048 lgc->result = GNUNET_malloc (msize);
2049 lgc->result->header.size = htons (msize);
2050 lgc->result->header.type = htons (GNUNET_MESSAGE_TYPE_FS_CONTENT);
2051 lgc->result->type = htonl (type);
2052 lgc->result->expiration = GNUNET_TIME_absolute_hton (expiration);
2053 memcpy (&lgc->result[1],
2057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2058 "Received new result for `%s' from local datastore, passing to client.\n",
2059 GNUNET_h2s (&lgc->query));
2061 GNUNET_SERVER_notify_transmit_ready (lgc->client,
2063 GNUNET_TIME_UNIT_FOREVER_REL,
2064 &transmit_local_result,
2070 * We're processing a search request from a local
2071 * client. Now it is our turn to query the datastore.
2073 * @param cls our closure (struct LocalGetContext)
2077 transmit_local_get (void *cls,
2078 const struct GNUNET_SCHEDULER_TaskContext *tc)
2080 struct LocalGetContext *lgc = cls;
2084 if (type == GNUNET_DATASTORE_BLOCKTYPE_DBLOCK)
2085 type = GNUNET_DATASTORE_BLOCKTYPE_ANY; /* to get on-demand as well */
2086 GNUNET_DATASTORE_get (dsh,
2089 &process_local_get_result,
2091 GNUNET_TIME_UNIT_FOREVER_REL);
2096 * We're processing a search request from a local
2097 * client. Now it is our turn to query the datastore.
2099 * @param cls our closure (struct LocalGetContext)
2100 * @param ok did we succeed to queue for datastore access, should always be GNUNET_OK
2103 transmit_local_get_ready (void *cls,
2106 struct LocalGetContext *lgc = cls;
2108 GNUNET_assert (GNUNET_OK == ok);
2109 GNUNET_SCHEDULER_add_continuation (sched,
2110 &transmit_local_get,
2112 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
2117 * Handle START_SEARCH-message (search request from client).
2119 * @param cls closure
2120 * @param client identification of the client
2121 * @param message the actual message
2124 handle_start_search (void *cls,
2125 struct GNUNET_SERVER_Client *client,
2126 const struct GNUNET_MessageHeader *message)
2128 const struct SearchMessage *sm;
2129 struct LocalGetContext *lgc;
2133 msize = ntohs (message->size);
2134 if ( (msize < sizeof (struct SearchMessage)) ||
2135 (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)) )
2138 GNUNET_SERVER_receive_done (client,
2142 sc = (msize - sizeof (struct SearchMessage)) / sizeof (GNUNET_HashCode);
2143 sm = (const struct SearchMessage*) message;
2144 GNUNET_SERVER_client_keep (client);
2145 lgc = GNUNET_malloc (sizeof (struct LocalGetContext));
2148 lgc->results_used = sc;
2149 GNUNET_array_grow (lgc->results,
2152 memcpy (lgc->results,
2154 sc * sizeof (GNUNET_HashCode));
2156 lgc->client = client;
2157 lgc->type = ntohl (sm->type);
2158 lgc->anonymity_level = ntohl (sm->anonymity_level);
2161 case GNUNET_DATASTORE_BLOCKTYPE_DBLOCK:
2162 case GNUNET_DATASTORE_BLOCKTYPE_IBLOCK:
2163 lgc->target.hashPubKey = sm->target;
2165 case GNUNET_DATASTORE_BLOCKTYPE_SBLOCK:
2166 lgc->namespace = sm->target;
2171 lgc->query = sm->query;
2172 GNUNET_CONTAINER_DLL_insert (lgc_head, lgc_tail, lgc);
2173 lgc->req = queue_ds_request (GNUNET_TIME_UNIT_FOREVER_REL,
2174 &transmit_local_get_ready,
2180 * List of handlers for the messages understood by this
2183 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2184 {&handle_index_start, NULL,
2185 GNUNET_MESSAGE_TYPE_FS_INDEX_START, 0},
2186 {&handle_index_list_get, NULL,
2187 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET, sizeof(struct GNUNET_MessageHeader) },
2188 {&handle_unindex, NULL, GNUNET_MESSAGE_TYPE_FS_UNINDEX,
2189 sizeof (struct UnindexMessage) },
2190 {&handle_start_search, NULL, GNUNET_MESSAGE_TYPE_FS_START_SEARCH,
2197 * Clean up the memory used by the PendingRequest structure (except
2198 * for the client or peer list that the request may be part of).
2200 * @param pr request to clean up
2203 destroy_pending_request (struct PendingRequest *pr)
2205 struct PendingReply *reply;
2206 struct ClientList *cl;
2208 GNUNET_CONTAINER_multihashmap_remove (requests_by_query,
2211 // FIXME: not sure how this can work (efficiently)
2212 // also, what does the return value mean?
2213 if (pr->client == NULL)
2215 GNUNET_CONTAINER_heap_remove_node (requests_by_expiration,
2220 cl = pr->crl_entry->cl;
2221 GNUNET_CONTAINER_DLL_remove (cl->head,
2225 if (GNUNET_SCHEDULER_NO_TASK != pr->task)
2226 GNUNET_SCHEDULER_cancel (sched, pr->task);
2227 if (NULL != pr->cth)
2228 GNUNET_CORE_notify_transmit_ready_cancel (pr->cth);
2230 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
2232 GNUNET_CONNECTION_notify_transmit_ready_cancel (pr->th);
2233 while (NULL != (reply = pr->replies_pending))
2235 pr->replies_pending = reply->next;
2236 GNUNET_free (reply);
2238 GNUNET_PEER_change_rc (pr->source_pid, -1);
2239 GNUNET_PEER_change_rc (pr->target_pid, -1);
2240 GNUNET_PEER_decrement_rcs (pr->used_pids, pr->used_pids_off);
2241 GNUNET_free_non_null (pr->used_pids);
2242 GNUNET_free_non_null (pr->replies_seen);
2243 GNUNET_free_non_null (pr->namespace);
2249 * A client disconnected. Remove all of its pending queries.
2251 * @param cls closure, NULL
2252 * @param client identification of the client
2255 handle_client_disconnect (void *cls,
2256 struct GNUNET_SERVER_Client
2259 struct LocalGetContext *lgc;
2260 struct ClientList *cpos;
2261 struct ClientList *cprev;
2262 struct ClientRequestList *rl;
2265 while ( (NULL != lgc) &&
2266 (lgc->client != client) )
2269 local_get_context_free (lgc);
2272 while ( (NULL != cpos) &&
2273 (clients->client != client) )
2281 clients = cpos->next;
2283 cprev->next = cpos->next;
2284 while (NULL != (rl = cpos->head))
2286 cpos->head = rl->next;
2287 destroy_pending_request (rl->req);
2296 * Iterator over entries in the "requests_by_query" map
2297 * that frees all the entries.
2299 * @param cls closure, NULL
2300 * @param key current key code (the query, unused)
2301 * @param value value in the hash map, of type "struct PendingRequest*"
2302 * @return GNUNET_YES (we should continue to iterate)
2305 destroy_pending_request_cb (void *cls,
2306 const GNUNET_HashCode * key,
2309 struct PendingRequest *pr = value;
2311 destroy_pending_request (pr);
2317 * Task run during shutdown.
2323 shutdown_task (void *cls,
2324 const struct GNUNET_SCHEDULER_TaskContext *tc)
2326 struct IndexInfo *pos;
2329 GNUNET_CORE_disconnect (core);
2330 GNUNET_DATASTORE_disconnect (dsh,
2333 GNUNET_CONTAINER_multihashmap_iterate (requests_by_query,
2334 &destroy_pending_request_cb,
2336 while (clients != NULL)
2337 handle_client_disconnect (NULL,
2339 GNUNET_CONTAINER_multihashmap_destroy (requests_by_query);
2340 requests_by_query = NULL;
2341 GNUNET_CONTAINER_multihashmap_destroy (requests_by_peer);
2342 requests_by_peer = NULL;
2343 GNUNET_CONTAINER_heap_destroy (requests_by_expiration);
2344 requests_by_expiration = NULL;
2345 // FIXME: iterate over entries and free individually?
2346 // (or do we get disconnect notifications?)
2347 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
2348 connected_peers = NULL;
2349 GNUNET_CONTAINER_multihashmap_destroy (ifm);
2351 while (NULL != (pos = indexed_files))
2353 indexed_files = pos->next;
2360 * Free (each) request made by the peer.
2362 * @param cls closure, points to peer that the request belongs to
2363 * @param key current key code
2364 * @param value value in the hash map
2365 * @return GNUNET_YES (we should continue to iterate)
2368 destroy_request (void *cls,
2369 const GNUNET_HashCode * key,
2372 const struct GNUNET_PeerIdentity * peer = cls;
2373 struct PendingRequest *pr = value;
2375 GNUNET_CONTAINER_multihashmap_remove (requests_by_peer,
2378 destroy_pending_request (pr);
2385 * Method called whenever a given peer connects.
2387 * @param cls closure, not used
2388 * @param peer peer identity this notification is about
2391 peer_connect_handler (void *cls,
2393 GNUNET_PeerIdentity * peer)
2395 struct ConnectedPeer *cp;
2397 cp = GNUNET_malloc (sizeof (struct ConnectedPeer));
2398 cp->pid = GNUNET_PEER_intern (peer);
2399 GNUNET_CONTAINER_multihashmap_put (connected_peers,
2402 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2407 * Method called whenever a peer disconnects.
2409 * @param cls closure, not used
2410 * @param peer peer identity this notification is about
2413 peer_disconnect_handler (void *cls,
2415 GNUNET_PeerIdentity * peer)
2417 struct ConnectedPeer *cp;
2419 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2421 GNUNET_PEER_change_rc (cp->pid, -1);
2422 GNUNET_PEER_decrement_rcs (cp->last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
2424 GNUNET_CONTAINER_multihashmap_get_multiple (requests_by_peer,
2432 * We're processing a GET request from
2433 * another peer and have decided to forward
2434 * it to other peers.
2436 * @param cls our "struct ProcessGetContext *"
2440 forward_get_request (void *cls,
2441 const struct GNUNET_SCHEDULER_TaskContext *tc)
2443 struct ProcessGetContext *pgc = cls;
2444 struct PendingRequest *pr;
2445 struct PendingRequest *eer;
2446 struct GNUNET_PeerIdentity target;
2448 pr = GNUNET_malloc (sizeof (struct PendingRequest));
2449 if (GET_MESSAGE_BIT_SKS_NAMESPACE == (GET_MESSAGE_BIT_SKS_NAMESPACE & pgc->bm))
2451 pr->namespace = GNUNET_malloc (sizeof(GNUNET_HashCode));
2452 *pr->namespace = pgc->namespace;
2455 pr->bf_size = pgc->bf_size;
2457 pr->start_time = pgc->start_time;
2458 pr->query = pgc->query;
2459 pr->source_pid = GNUNET_PEER_intern (&pgc->reply_to);
2460 if (GET_MESSAGE_BIT_TRANSMIT_TO == (GET_MESSAGE_BIT_TRANSMIT_TO & pgc->bm))
2461 pr->target_pid = GNUNET_PEER_intern (&pgc->prime_target);
2462 pr->anonymity_level = 1; /* default */
2463 pr->priority = pgc->priority;
2464 pr->remaining_priority = pr->priority;
2465 pr->mingle = pgc->mingle;
2467 pr->type = pgc->type;
2468 GNUNET_CONTAINER_multihashmap_put (requests_by_query,
2471 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2472 GNUNET_CONTAINER_multihashmap_put (requests_by_peer,
2473 &pgc->reply_to.hashPubKey,
2475 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2476 GNUNET_CONTAINER_heap_insert (requests_by_expiration,
2478 pr->start_time.value + pr->ttl);
2479 if (GNUNET_CONTAINER_heap_get_size (requests_by_expiration) > max_pending_requests)
2481 /* expire oldest request! */
2482 eer = GNUNET_CONTAINER_heap_peek (requests_by_expiration);
2483 GNUNET_PEER_resolve (eer->source_pid,
2485 GNUNET_CONTAINER_multihashmap_remove (requests_by_peer,
2488 destroy_pending_request (eer);
2490 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2491 get_processing_delay (),
2492 &forward_request_task,
2497 * Transmit the given message by copying it to
2498 * the target buffer "buf". "buf" will be
2499 * NULL and "size" zero if the socket was closed for
2500 * writing in the meantime. In that case, only
2504 * @param cls closure, pointer to the message
2505 * @param size number of bytes available in buf
2506 * @param buf where the callee should write the message
2507 * @return number of bytes written to buf
2510 transmit_message (void *cls,
2511 size_t size, void *buf)
2513 struct GNUNET_MessageHeader *msg = cls;
2519 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2520 "Dropping reply, core too busy.\n");
2525 msize = ntohs (msg->size);
2526 GNUNET_assert (size >= msize);
2527 memcpy (buf, msg, msize);
2534 * Test if the load on this peer is too high
2535 * to even consider processing the query at
2538 * @return GNUNET_YES if the load is too high, GNUNET_NO otherwise
2541 test_load_too_high ()
2543 return GNUNET_NO; // FIXME
2548 * We're processing (local) results for a search request
2549 * from another peer. Pass applicable results to the
2550 * peer and if we are done either clean up (operation
2551 * complete) or forward to other peers (more results possible).
2553 * @param cls our closure (struct LocalGetContext)
2554 * @param key key for the content
2555 * @param size number of bytes in data
2556 * @param data content stored
2557 * @param type type of the content
2558 * @param priority priority of the content
2559 * @param anonymity anonymity-level for the content
2560 * @param expiration expiration time for the content
2561 * @param uid unique identifier for the datum;
2562 * maybe 0 if no unique identifier is available
2565 process_p2p_get_result (void *cls,
2566 const GNUNET_HashCode * key,
2572 struct GNUNET_TIME_Absolute
2576 struct ProcessGetContext *pgc = cls;
2577 GNUNET_HashCode dhash;
2578 GNUNET_HashCode mhash;
2579 struct PutMessage *reply;
2583 /* no more results */
2584 if ( ( (pgc->policy & ROUTING_POLICY_FORWARD) == ROUTING_POLICY_FORWARD) &&
2585 ( (0 == pgc->results_found) ||
2586 (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_KBLOCK) ||
2587 (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_SBLOCK) ||
2588 (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_SKBLOCK) ) )
2590 GNUNET_SCHEDULER_add_continuation (sched,
2591 &forward_get_request,
2593 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
2597 if (pgc->bf != NULL)
2598 GNUNET_CONTAINER_bloomfilter_free (pgc->bf);
2604 if (type == GNUNET_DATASTORE_BLOCKTYPE_ONDEMAND)
2606 handle_on_demand_block (key, size, data, type, priority,
2607 anonymity, expiration, uid,
2608 &process_p2p_get_result,
2612 /* check for duplicates */
2613 GNUNET_CRYPTO_hash (data, size, &dhash);
2614 mingle_hash (&dhash,
2617 if ( (pgc->bf != NULL) &&
2619 GNUNET_CONTAINER_bloomfilter_test (pgc->bf,
2623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2624 "Result from datastore filtered by bloomfilter.\n");
2626 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2629 pgc->results_found++;
2630 if ( (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_KBLOCK) ||
2631 (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_SBLOCK) ||
2632 (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_SKBLOCK) )
2634 if (pgc->bf == NULL)
2637 pgc->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
2641 GNUNET_CONTAINER_bloomfilter_add (pgc->bf,
2645 reply = GNUNET_malloc (sizeof (struct PutMessage) + size);
2646 reply->header.size = htons (sizeof (struct PutMessage) + size);
2647 reply->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2648 reply->type = htonl (type);
2649 reply->expiration = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (expiration));
2650 memcpy (&reply[1], data, size);
2651 GNUNET_CORE_notify_transmit_ready (core,
2653 ACCEPTABLE_REPLY_DELAY,
2655 sizeof (struct PutMessage) + size,
2658 if ( (GNUNET_YES == test_load_too_high()) ||
2659 (pgc->results_found > 5 + 2 * pgc->priority) )
2661 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
2662 pgc->policy &= ~ ROUTING_POLICY_FORWARD;
2665 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2670 * We're processing a GET request from another peer. Give it to our
2673 * @param cls our "struct ProcessGetContext"
2674 * @param ok did we get a datastore slice or not?
2677 ds_get_request (void *cls,
2680 struct ProcessGetContext *pgc = cls;
2682 struct GNUNET_TIME_Relative timeout;
2684 if (GNUNET_OK != ok)
2686 /* no point in doing P2P stuff if we can't even do local */
2691 if (type == GNUNET_DATASTORE_BLOCKTYPE_DBLOCK)
2692 type = GNUNET_DATASTORE_BLOCKTYPE_ANY; /* to get on-demand as well */
2693 timeout = GNUNET_TIME_relative_multiply (BASIC_DATASTORE_REQUEST_DELAY,
2694 (pgc->priority + 1));
2695 GNUNET_DATASTORE_get (dsh,
2698 &process_p2p_get_result,
2705 * The priority level imposes a bound on the maximum
2706 * value for the ttl that can be requested.
2708 * @param ttl_in requested ttl
2709 * @param prio given priority
2710 * @return ttl_in if ttl_in is below the limit,
2711 * otherwise the ttl-limit for the given priority
2714 bound_ttl (int32_t ttl_in, uint32_t prio)
2716 unsigned long long allowed;
2720 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
2721 if (ttl_in > allowed)
2723 if (allowed >= (1 << 30))
2732 * We've received a request with the specified
2733 * priority. Bound it according to how much
2734 * we trust the given peer.
2736 * @param prio_in requested priority
2737 * @param peer the peer making the request
2738 * @return effective priority
2741 bound_priority (uint32_t prio_in,
2742 const struct GNUNET_PeerIdentity *peer)
2749 * Handle P2P "GET" request.
2751 * @param cls closure, always NULL
2752 * @param other the other peer involved (sender or receiver, NULL
2753 * for loopback messages where we are both sender and receiver)
2754 * @param message the actual message
2755 * @return GNUNET_OK to keep the connection open,
2756 * GNUNET_SYSERR to close it (signal serious error)
2759 handle_p2p_get (void *cls,
2760 const struct GNUNET_PeerIdentity *other,
2761 const struct GNUNET_MessageHeader *message)
2764 const struct GetMessage *gm;
2766 const GNUNET_HashCode *opt;
2767 struct ProcessGetContext *pgc;
2770 uint32_t ttl_decrement;
2775 msize = ntohs(message->size);
2776 if (msize < sizeof (struct GetMessage))
2778 GNUNET_break_op (0);
2779 return GNUNET_SYSERR;
2781 gm = (const struct GetMessage*) message;
2782 bm = ntohl (gm->hash_bitmap);
2790 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
2792 GNUNET_break_op (0);
2793 return GNUNET_SYSERR;
2795 opt = (const GNUNET_HashCode*) &gm[1];
2796 bfsize = msize - sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode);
2797 pgc = GNUNET_malloc (sizeof (struct ProcessGetContext));
2800 pgc->bf = GNUNET_CONTAINER_bloomfilter_init ((const char*) &pgc[1],
2803 pgc->bf_size = bfsize;
2805 pgc->type = ntohl (gm->type);
2806 pgc->bm = ntohl (gm->hash_bitmap);
2807 pgc->mingle = gm->filter_mutator;
2809 if (0 != (pgc->bm & GET_MESSAGE_BIT_RETURN_TO))
2810 pgc->reply_to.hashPubKey = opt[bits++];
2812 pgc->reply_to = *other;
2813 if (0 != (pgc->bm & GET_MESSAGE_BIT_SKS_NAMESPACE))
2814 pgc->namespace = opt[bits++];
2815 else if (pgc->type == GNUNET_DATASTORE_BLOCKTYPE_SBLOCK)
2817 GNUNET_break_op (0);
2819 return GNUNET_SYSERR;
2821 if (0 != (pgc->bm & GET_MESSAGE_BIT_TRANSMIT_TO))
2822 pgc->prime_target.hashPubKey = opt[bits++];
2823 /* note that we can really only check load here since otherwise
2824 peers could find out that we are overloaded by being disconnected
2825 after sending us a malformed query... */
2826 if (GNUNET_YES == test_load_too_high ())
2828 if (NULL != pgc->bf)
2829 GNUNET_CONTAINER_bloomfilter_free (pgc->bf);
2832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2833 "Dropping query from `%s', this peer is too busy.\n",
2834 GNUNET_i2s (other));
2838 net_load_up = 50; // FIXME
2839 net_load_down = 50; // FIXME
2840 pgc->policy = ROUTING_POLICY_NONE;
2841 if ( (net_load_up < IDLE_LOAD_THRESHOLD) &&
2842 (net_load_down < IDLE_LOAD_THRESHOLD) )
2844 pgc->policy |= ROUTING_POLICY_ALL;
2845 pgc->priority = 0; /* no charge */
2849 pgc->priority = bound_priority (ntohl (gm->priority), other);
2851 IDLE_LOAD_THRESHOLD + pgc->priority * pgc->priority) &&
2853 IDLE_LOAD_THRESHOLD + pgc->priority * pgc->priority) )
2855 pgc->policy |= ROUTING_POLICY_ALL;
2859 // FIXME: is this sound?
2860 if (net_load_up < 90 + 10 * pgc->priority)
2861 pgc->policy |= ROUTING_POLICY_FORWARD;
2862 if (net_load_down < 90 + 10 * pgc->priority)
2863 pgc->policy |= ROUTING_POLICY_ANSWER;
2866 if (pgc->policy == ROUTING_POLICY_NONE)
2869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2870 "Dropping query from `%s', network saturated.\n",
2871 GNUNET_i2s (other));
2873 if (NULL != pgc->bf)
2874 GNUNET_CONTAINER_bloomfilter_free (pgc->bf);
2876 return GNUNET_OK; /* drop */
2878 if ((pgc->policy & ROUTING_POLICY_INDIRECT) != ROUTING_POLICY_INDIRECT)
2879 pgc->priority = 0; /* kill the priority (we cannot benefit) */
2880 pgc->ttl = bound_ttl (ntohl (gm->ttl), pgc->priority);
2881 /* decrement ttl (always) */
2882 ttl_decrement = 2 * TTL_DECREMENT +
2883 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2885 if ( (pgc->ttl < 0) &&
2886 (pgc->ttl - ttl_decrement > 0) )
2889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2890 "Dropping query from `%s' due to TTL underflow.\n",
2891 GNUNET_i2s (other));
2893 /* integer underflow => drop (should be very rare)! */
2894 if (NULL != pgc->bf)
2895 GNUNET_CONTAINER_bloomfilter_free (pgc->bf);
2899 pgc->ttl -= ttl_decrement;
2900 pgc->start_time = GNUNET_TIME_absolute_get ();
2901 preference = (double) pgc->priority;
2902 if (preference < QUERY_BANDWIDTH_VALUE)
2903 preference = QUERY_BANDWIDTH_VALUE;
2904 // FIXME: also reserve bandwidth for reply?
2905 GNUNET_CORE_peer_configure (core,
2907 GNUNET_TIME_UNIT_FOREVER_REL,
2908 0, 0, preference, NULL, NULL);
2909 if (0 != (pgc->policy & ROUTING_POLICY_ANSWER))
2910 pgc->drq = queue_ds_request (BASIC_DATASTORE_REQUEST_DELAY,
2914 GNUNET_SCHEDULER_add_continuation (sched,
2915 &forward_get_request,
2917 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
2923 * Function called to notify us that we can now transmit a reply to a
2924 * client or peer. "buf" will be NULL and "size" zero if the socket was
2925 * closed for writing in the meantime.
2927 * @param cls closure, points to a "struct PendingRequest*" with
2928 * one or more pending replies
2929 * @param size number of bytes available in buf
2930 * @param buf where the callee should write the message
2931 * @return number of bytes written to buf
2934 transmit_result (void *cls,
2938 struct PendingRequest *pr = cls;
2940 struct PendingReply *reply;
2944 while (NULL != (reply = pr->replies_pending))
2946 if ( (reply->msize + ret < ret) ||
2947 (reply->msize + ret > size) )
2949 pr->replies_pending = reply->next;
2950 memcpy (&cbuf[ret], &reply[1], reply->msize);
2951 ret += reply->msize;
2952 GNUNET_free (reply);
2959 * Iterator over pending requests.
2961 * @param cls response (struct ProcessReplyClosure)
2962 * @param key our query
2963 * @param value value in the hash map (meta-info about the query)
2964 * @return GNUNET_YES (we should continue to iterate)
2967 process_reply (void *cls,
2968 const GNUNET_HashCode * key,
2971 struct ProcessReplyClosure *prq = cls;
2972 struct PendingRequest *pr = value;
2973 struct PendingRequest *eer;
2974 struct PendingReply *reply;
2975 struct PutMessage *pm;
2976 struct ContentMessage *cm;
2977 GNUNET_HashCode chash;
2978 GNUNET_HashCode mhash;
2979 struct GNUNET_PeerIdentity target;
2982 struct GNUNET_TIME_Relative max_delay;
2984 GNUNET_CRYPTO_hash (prq->data,
2989 case GNUNET_DATASTORE_BLOCKTYPE_DBLOCK:
2990 case GNUNET_DATASTORE_BLOCKTYPE_IBLOCK:
2992 case GNUNET_DATASTORE_BLOCKTYPE_SBLOCK:
2993 /* FIXME: does prq->namespace match our expectations? */
2994 /* then: fall-through??? */
2995 case GNUNET_DATASTORE_BLOCKTYPE_KBLOCK:
2998 mingle_hash (&chash, pr->mingle, &mhash);
2999 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (pr->bf,
3001 return GNUNET_YES; /* duplicate */
3002 GNUNET_CONTAINER_bloomfilter_add (pr->bf,
3006 case GNUNET_DATASTORE_BLOCKTYPE_SKBLOCK:
3007 // FIXME: any checks against duplicates for SKBlocks?
3010 prio = pr->priority;
3011 prq->priority += pr->remaining_priority;
3012 pr->remaining_priority = 0;
3013 if (pr->client != NULL)
3015 if (pr->replies_seen_size == pr->replies_seen_off)
3016 GNUNET_array_grow (pr->replies_seen,
3017 pr->replies_seen_size,
3018 pr->replies_seen_size * 2 + 4);
3019 pr->replies_seen[pr->replies_seen_off++] = chash;
3020 // FIXME: possibly recalculate BF!
3022 if (pr->client == NULL)
3024 msize = sizeof (struct ContentMessage) + prq->size;
3025 reply = GNUNET_malloc (msize + sizeof (struct PendingReply));
3026 reply->msize = msize;
3027 cm = (struct ContentMessage*) &reply[1];
3028 cm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_CONTENT);
3029 cm->header.size = htons (msize);
3030 cm->type = htonl (prq->type);
3031 cm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
3032 reply->next = pr->replies_pending;
3033 pr->replies_pending = reply;
3034 memcpy (&reply[1], prq->data, prq->size);
3035 if (pr->cth != NULL)
3037 max_delay = GNUNET_TIME_UNIT_FOREVER_REL;
3038 if (GNUNET_CONTAINER_heap_get_size (requests_by_expiration) >= max_pending_requests)
3040 /* estimate expiration time from time difference between
3041 first request that will be discarded and this request */
3042 eer = GNUNET_CONTAINER_heap_peek (requests_by_expiration);
3043 max_delay = GNUNET_TIME_absolute_get_difference (pr->start_time,
3046 GNUNET_PEER_resolve (pr->source_pid,
3048 pr->cth = GNUNET_CORE_notify_transmit_ready (core,
3055 if (NULL == pr->cth)
3057 // FIXME: now what? discard?
3062 msize = sizeof (struct PutMessage) + prq->size;
3063 reply = GNUNET_malloc (msize + sizeof (struct PendingReply));
3064 reply->msize = msize;
3065 reply->next = pr->replies_pending;
3066 pm = (struct PutMessage*) &reply[1];
3067 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
3068 pm->header.size = htons (msize);
3069 pm->type = htonl (prq->type);
3070 pm->expiration = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (prq->expiration));
3071 pr->replies_pending = reply;
3072 memcpy (&reply[1], prq->data, prq->size);
3075 pr->th = GNUNET_SERVER_notify_transmit_ready (pr->client,
3077 GNUNET_TIME_UNIT_FOREVER_REL,
3082 // FIXME: need to try again later (not much
3083 // to do here specifically, but we need to
3084 // check somewhere else to handle this case!)
3087 // FIXME: implement hot-path routing statistics keeping!
3093 * Check if the given KBlock is well-formed.
3095 * @param kb the kblock data (or at least "dsize" bytes claiming to be one)
3096 * @param dsize size of "kb" in bytes; check for < sizeof(struct KBlock)!
3097 * @param query where to store the query that this block answers
3098 * @return GNUNET_OK if this is actually a well-formed KBlock
3101 check_kblock (const struct KBlock *kb,
3103 GNUNET_HashCode *query)
3105 if (dsize < sizeof (struct KBlock))
3107 GNUNET_break_op (0);
3108 return GNUNET_SYSERR;
3110 if (dsize - sizeof (struct KBlock) !=
3111 ntohs (kb->purpose.size)
3112 - sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose)
3113 - sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) )
3115 GNUNET_break_op (0);
3116 return GNUNET_SYSERR;
3119 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_FS_KBLOCK,
3124 GNUNET_break_op (0);
3125 return GNUNET_SYSERR;
3128 GNUNET_CRYPTO_hash (&kb->keyspace,
3129 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3136 * Check if the given SBlock is well-formed.
3138 * @param sb the sblock data (or at least "dsize" bytes claiming to be one)
3139 * @param dsize size of "kb" in bytes; check for < sizeof(struct SBlock)!
3140 * @param query where to store the query that this block answers
3141 * @param namespace where to store the namespace that this block belongs to
3142 * @return GNUNET_OK if this is actually a well-formed SBlock
3145 check_sblock (const struct SBlock *sb,
3147 GNUNET_HashCode *query,
3148 GNUNET_HashCode *namespace)
3150 if (dsize < sizeof (struct SBlock))
3152 GNUNET_break_op (0);
3153 return GNUNET_SYSERR;
3156 ntohs (sb->purpose.size) + sizeof (struct GNUNET_CRYPTO_RsaSignature))
3158 GNUNET_break_op (0);
3159 return GNUNET_SYSERR;
3162 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_FS_SBLOCK,
3167 GNUNET_break_op (0);
3168 return GNUNET_SYSERR;
3171 *query = sb->identifier;
3172 if (namespace != NULL)
3173 GNUNET_CRYPTO_hash (&sb->subspace,
3174 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3181 * Handle P2P "PUT" request.
3183 * @param cls closure, always NULL
3184 * @param other the other peer involved (sender or receiver, NULL
3185 * for loopback messages where we are both sender and receiver)
3186 * @param message the actual message
3187 * @return GNUNET_OK to keep the connection open,
3188 * GNUNET_SYSERR to close it (signal serious error)
3191 handle_p2p_put (void *cls,
3192 const struct GNUNET_PeerIdentity *other,
3193 const struct GNUNET_MessageHeader *message)
3195 const struct PutMessage *put;
3199 struct GNUNET_TIME_Absolute expiration;
3200 GNUNET_HashCode query;
3201 struct ProcessReplyClosure prq;
3203 msize = ntohs (message->size);
3204 if (msize < sizeof (struct PutMessage))
3207 return GNUNET_SYSERR;
3209 put = (const struct PutMessage*) message;
3210 dsize = msize - sizeof (struct PutMessage);
3211 type = ntohl (put->type);
3212 expiration = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (put->expiration));
3214 /* first, validate! */
3217 case GNUNET_DATASTORE_BLOCKTYPE_DBLOCK:
3218 case GNUNET_DATASTORE_BLOCKTYPE_IBLOCK:
3219 GNUNET_CRYPTO_hash (&put[1], dsize, &query);
3221 case GNUNET_DATASTORE_BLOCKTYPE_KBLOCK:
3223 check_kblock ((const struct KBlock*) &put[1],
3226 return GNUNET_SYSERR;
3228 case GNUNET_DATASTORE_BLOCKTYPE_SBLOCK:
3230 check_sblock ((const struct SBlock*) &put[1],
3234 return GNUNET_SYSERR;
3236 case GNUNET_DATASTORE_BLOCKTYPE_SKBLOCK:
3237 // FIXME -- validate SKBLOCK!
3241 /* unknown block type */
3242 GNUNET_break_op (0);
3243 return GNUNET_SYSERR;
3246 /* now, lookup 'query' */
3247 prq.data = (const void*) &put[1];
3250 prq.expiration = expiration;
3252 GNUNET_CONTAINER_multihashmap_get_multiple (requests_by_query,
3256 // FIXME: if migration is on and load is low,
3257 // queue to store data in datastore;
3258 // use "prq.priority" for that!
3264 * List of handlers for P2P messages
3265 * that we care about.
3267 static struct GNUNET_CORE_MessageHandler p2p_handlers[] =
3270 GNUNET_MESSAGE_TYPE_FS_GET, 0 },
3272 GNUNET_MESSAGE_TYPE_FS_PUT, 0 },
3278 * Task that will try to initiate a connection with the
3285 core_connect_task (void *cls,
3286 const struct GNUNET_SCHEDULER_TaskContext *tc);
3290 * Function called by the core after we've
3293 * @param cls closure, unused
3294 * @param server handle to the core service
3295 * @param my_identity our peer identity (unused)
3296 * @param publicKey our public key (unused)
3299 core_start_cb (void *cls,
3300 struct GNUNET_CORE_Handle * server,
3301 const struct GNUNET_PeerIdentity *
3304 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
3309 GNUNET_SCHEDULER_add_delayed (sched,
3310 GNUNET_TIME_UNIT_SECONDS,
3320 * Task that will try to initiate a connection with the
3327 core_connect_task (void *cls,
3328 const struct GNUNET_SCHEDULER_TaskContext *tc)
3330 GNUNET_CORE_connect (sched,
3332 GNUNET_TIME_UNIT_FOREVER_REL,
3335 &peer_connect_handler,
3336 &peer_disconnect_handler,
3345 * Process fs requests.
3347 * @param cls closure
3348 * @param s scheduler to use
3349 * @param server the initialized server
3350 * @param c configuration to use
3354 struct GNUNET_SCHEDULER_Handle *s,
3355 struct GNUNET_SERVER_Handle *server,
3356 const struct GNUNET_CONFIGURATION_Handle *c)
3361 ifm = GNUNET_CONTAINER_multihashmap_create (128);
3362 requests_by_query = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3363 requests_by_peer = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3364 connected_peers = GNUNET_CONTAINER_multihashmap_create (64);
3365 requests_by_expiration = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3367 dsh = GNUNET_DATASTORE_connect (cfg,
3371 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3372 _("Failed to connect to datastore service.\n"));
3375 GNUNET_SERVER_disconnect_notify (server,
3376 &handle_client_disconnect,
3378 GNUNET_SERVER_add_handlers (server, handlers);
3379 core_connect_task (NULL, NULL);
3380 GNUNET_SCHEDULER_add_delayed (sched,
3381 GNUNET_TIME_UNIT_FOREVER_REL,
3388 * The main function for the fs service.
3390 * @param argc number of arguments from the command line
3391 * @param argv command line arguments
3392 * @return 0 ok, 1 on error
3395 main (int argc, char *const *argv)
3397 return (GNUNET_OK ==
3398 GNUNET_SERVICE_run (argc,
3400 "fs", &run, NULL)) ? 0 : 1;
3403 /* end of gnunet-service-fs.c */