2 This file is part of GNUnet.
3 (C) 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
8 option) any later version.
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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.
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.
23 * @brief definitions for the entire fs module
24 * @author Igor Wronsky, Christian Grothoff
29 #include "gnunet_constants.h"
30 #include "gnunet_datastore_service.h"
31 #include "gnunet_fs_service.h"
34 * Size of the individual blocks used for file-sharing.
36 #define DBLOCK_SIZE (32*1024)
40 * Pick a multiple of 2 here to achive 8-byte alignment!
41 * We also probably want DBlocks to have (roughly) the
42 * same size as IBlocks. With SHA-512, the optimal
43 * value is 32768 byte / 128 byte = 256
44 * (128 byte = 2 * 512 bits). DO NOT CHANGE!
46 #define CHK_PER_INODE 256
50 * Maximum size for a file to be considered for
51 * inlining in a directory.
53 #define MAX_INLINE_SIZE 65536
57 * Blocksize to use when hashing files
58 * for indexing (blocksize for IO, not for
59 * the DBlocks). Larger blocksizes can
60 * be more efficient but will be more disruptive
61 * as far as the scheduler is concerned.
63 #define HASHING_BLOCKSIZE (1024 * 1024)
66 * Number of bits we set per entry in the bloomfilter.
69 #define BLOOMFILTER_K 16
72 * By how much (in ms) do we decrement the TTL
75 #define TTL_DECREMENT 5000
78 * Length of the P2P success tracker. Note that
79 * having a very long list can also hurt performance.
81 #define P2P_SUCCESS_LIST_SIZE 8
85 * Length of the CS-2-P success tracker. Note that
86 * having a very long list can also hurt performance.
88 #define CS2P_SUCCESS_LIST_SIZE 8
91 * How long are we willing to wait for the datastore to be ready to
92 * process a request for a query without priority?
94 #define BASIC_DATASTORE_REQUEST_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
98 * How long are we willing to wait for the core to be ready to
99 * transmit a reply to the target peer (if we can not transmit
100 * until then, we will discard the reply).
102 #define ACCEPTABLE_REPLY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
106 * Bandwidth value of an (effectively) 0-priority query.
108 #define QUERY_BANDWIDTH_VALUE 0.001
111 * Bandwidth value of a 0-priority content (must be
112 * fairly high compared to query since content is
113 * typically significantly larger -- and more valueable
114 * since it can take many queries to get one piece of
117 #define CONTENT_BANDWIDTH_VALUE 0.8
120 * By which amount do we decrement the TTL for simple forwarding /
121 * indirection of the query; in milli-seconds. Set somewhat in
122 * accordance to your network latency (above the time it'll take you
123 * to send a packet and get a reply).
125 #define TTL_DECREMENT 5000
128 * Until which load do we consider the peer idle and do not
129 * charge at all? (should be larger than GNUNET_IDLE_LOAD_THRESHOLD used
130 * by the rest of the code)!
132 #define IDLE_LOAD_THRESHOLD ((100 + GNUNET_CONSTANTS_IDLE_LOAD_THRESHOLD) / 2)
137 * @brief content hash key
139 struct ContentHashKey
142 GNUNET_HashCode query;
147 * @brief complete information needed
148 * to download a file.
150 struct FileIdentifier
154 * Total size of the file in bytes. (network byte order (!))
156 uint64_t file_length;
159 * Query and key of the top GNUNET_EC_IBlock.
161 struct ContentHashKey chk;
167 * Information about a file and its location
168 * (peer claiming to share the file).
173 * Information about the shared file.
175 struct FileIdentifier fi;
178 * Identity of the peer sharing the file.
180 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded peer;
183 * Time when this location URI expires.
185 struct GNUNET_TIME_Absolute expirationTime;
188 * RSA signature over the GNUNET_EC_FileIdentifier,
189 * GNUNET_hash of the peer and expiration time.
191 struct GNUNET_CRYPTO_RsaSignature contentSignature;
196 { chk, sks, ksk, loc };
199 * A Universal Resource Identifier (URI), opaque.
209 * Keywords start with a '+' if they are
210 * mandatory (in which case the '+' is NOT
211 * part of the keyword) and with a
212 * simple space if they are optional
213 * (in which case the space is ALSO not
214 * part of the actual keyword).
216 * Double-quotes to protect spaces and
217 * %-encoding are NOT used internally
218 * (only in URI-strings).
223 * Size of the keywords array.
225 unsigned int keywordCount;
231 * Hash of the public key for the namespace.
233 GNUNET_HashCode namespace;
236 * Human-readable identifier chosen for this
237 * entry in the namespace.
243 * Information needed to retrieve a file (content-hash-key
246 struct FileIdentifier chk;
249 * Information needed to retrieve a file including signed
250 * location (identity of a peer) of the content.
259 * Information for a file or directory that is
260 * about to be published.
262 struct GNUNET_FS_FileInformation
266 * Files in a directory are kept as a linked list.
268 struct GNUNET_FS_FileInformation *next;
271 * If this is a file in a directory, "dir" refers to
272 * the directory; otherwise NULL.
274 struct GNUNET_FS_FileInformation *dir;
277 * Pointer kept for the client.
282 * Metadata to use for the file.
284 struct GNUNET_CONTAINER_MetaData *meta;
287 * Keywords to use for KBlocks.
289 struct GNUNET_FS_Uri *keywords;
292 * CHK for this file or directory. NULL if
293 * we have not yet computed it.
295 struct GNUNET_FS_Uri *chk_uri;
298 * At what time should the content expire?
300 struct GNUNET_TIME_Absolute expirationTime;
303 * At what time did we start this upload?
305 struct GNUNET_TIME_Absolute start_time;
308 * Under what filename is this struct serialized
309 * (for operational persistence).
314 * Encoder being used to publish this file.
316 struct GNUNET_FS_TreeEncoder *te;
319 * Error message (non-NULL if this operation
325 * Data describing either the file or the directory.
336 * Function that can be used to read the data for the file.
338 GNUNET_FS_DataReader reader;
341 * Closure for reader.
346 * Name of the file (must be an absolute path).
347 * Only required for indexing. FIXME: not yet
353 * If this file is being indexed, this value
354 * is set to the hash over the entire file
355 * (when the indexing process is started).
356 * Otherwise this field is not used.
358 GNUNET_HashCode file_id;
361 * Size of the file (in bytes).
366 * Should the file be indexed or inserted?
373 * Data for a directory.
378 * Name of the directory.
383 * Linked list of entries in the directory.
385 struct GNUNET_FS_FileInformation *entries;
388 * Size of the directory itself (in bytes); 0 if the
389 * size has not yet been calculated.
394 * Pointer to the data for the directory (or NULL if not
404 * Is this struct for a file or directory?
409 * Desired anonymity level.
414 * Desired priority (for keeping the content in the DB).
422 * Master context for most FS operations.
424 struct GNUNET_FS_Handle
429 struct GNUNET_SCHEDULER_Handle *sched;
432 * Configuration to use.
434 const struct GNUNET_CONFIGURATION_Handle *cfg;
437 * Name of our client.
442 * Function to call with updates on our progress.
444 GNUNET_FS_ProgressCallback upcb;
452 * Connection to the FS service.
454 struct GNUNET_CLIENT_Connection *client;
457 * How many downloads probing availability
458 * of search results do we have running
461 unsigned int active_probes;
466 enum GNUNET_FS_Flags flags;
472 * Handle for controlling an upload.
474 struct GNUNET_FS_PublishContext
477 * Handle to the global fs context.
479 struct GNUNET_FS_Handle *h;
482 * Argument to pass to the client in callbacks.
487 * File-structure that is being shared.
489 struct GNUNET_FS_FileInformation *fi;
492 * Namespace that we are publishing in, NULL if we have no namespace.
494 struct GNUNET_FS_Namespace *namespace;
497 * ID of the content in the namespace, NULL if we have no namespace.
502 * ID for future updates, NULL if we have no namespace or no updates.
507 * Our own client handle for the FS service;
508 * only briefly used when we start to index a
509 * file, otherwise NULL.
511 struct GNUNET_CLIENT_Connection *client;
514 * Current position in the file-tree for the
517 struct GNUNET_FS_FileInformation *fi_pos;
520 * Connection to the datastore service.
522 struct GNUNET_DATASTORE_Handle *dsh;
525 * ID of the task performing the upload. NO_TASK
526 * if the upload has completed.
528 GNUNET_SCHEDULER_TaskIdentifier upload_task;
531 * Typically GNUNET_NO. Set to GNUNET_YES if
532 * "upload_task" is GNUNET_SCHEDULER_NO_TASK
533 * and we're waiting for a response from the
534 * datastore service (in which case this
535 * struct must not be freed until we have that
536 * response). If someone tries to stop the
537 * download for good during this period,
538 * "in_network_wait" is set to GNUNET_SYSERR
539 * which will cause the struct to be destroyed
540 * right after we have the reply (or timeout)
541 * from the datastore service.
546 * Options for publishing.
548 enum GNUNET_FS_PublishOptions options;
551 * Space reservation ID with datastore service
559 * Phases of unindex processing (state machine).
564 * We're currently hashing the file.
566 UNINDEX_STATE_HASHING = 0,
569 * We're notifying the FS service about
572 UNINDEX_STATE_FS_NOTIFY = 1,
575 * We're telling the datastore to delete
576 * the respective entries.
578 UNINDEX_STATE_DS_REMOVE = 2,
583 UNINDEX_STATE_COMPLETE = 3,
586 * We've encountered a fatal error.
588 UNINDEX_STATE_ERROR = 4,
591 * We've been aborted. The next callback should clean up the
594 UNINDEX_STATE_ABORTED = 5
599 * Handle for controlling an unindexing operation.
601 struct GNUNET_FS_UnindexContext
607 struct GNUNET_FS_Handle *h;
610 * Name of the file that we are unindexing.
615 * Connection to the FS service,
616 * only valid during the UNINDEX_STATE_FS_NOTIFY
619 struct GNUNET_CLIENT_Connection *client;
622 * Connection to the datastore service,
623 * only valid during the UNINDEX_STATE_DS_NOTIFY
626 struct GNUNET_DATASTORE_Handle *dsh;
629 * Pointer kept for the client.
634 * Merkle-ish tree encoder context.
636 struct GNUNET_FS_TreeEncoder *tc;
639 * Handle used to read the file.
641 struct GNUNET_DISK_FileHandle *fh;
644 * Overall size of the file.
651 struct GNUNET_TIME_Absolute start_time;
654 * Hash of the file's contents (once
657 GNUNET_HashCode file_id;
660 * Current operatinonal phase.
662 enum UnindexState state;
668 * Information we store for each search result.
674 * URI to which this search result
677 struct GNUNET_FS_Uri *uri;
680 * Metadata for the search result.
682 struct GNUNET_CONTAINER_MetaData *meta;
685 * Client info for this search result.
690 * ID of a job that is currently probing
691 * this results' availability (NULL if we
692 * are not currently probing).
694 struct GNUNET_FS_DownloadContext *probe_ctx;
697 * ID of the task that will clean up the probe_ctx
698 * should it not complete on time (and that will
699 * need to be cancelled if we clean up the search
700 * result before then).
702 GNUNET_SCHEDULER_TaskIdentifier probe_cancel_task;
705 * Number of mandatory keywords for which
706 * we have NOT yet found the search result;
707 * when this value hits zero, the search
708 * result is given to the callback.
710 uint32_t mandatory_missing;
713 * Number of optional keywords under which
714 * this result was also found.
716 uint32_t optional_support;
719 * Number of availability tests that
720 * have succeeded for this result.
722 uint32_t availability_success;
725 * Number of availability trials that we
726 * have performed for this search result.
728 uint32_t availability_trials;
734 * Information we keep for each keyword in
737 struct SearchRequestEntry
740 * Hash of the original keyword, also known as the
741 * key (for decrypting the KBlock).
746 * Hash of the public key, also known as the query.
748 GNUNET_HashCode query;
751 * Map that contains a "struct SearchResult" for each result that
752 * was found under this keyword. Note that the entries will point
753 * to the same locations as those in the master result map (in
754 * "struct GNUNET_FS_SearchContext"), so they should not be freed.
755 * The key for each entry is the XOR of the key and query in the CHK
756 * URI (as a unique identifier for the search result).
758 struct GNUNET_CONTAINER_MultiHashMap *results;
761 * Is this keyword a mandatory keyword
762 * (started with '+')?
770 * Handle for controlling a search.
772 struct GNUNET_FS_SearchContext
775 * Handle to the global FS context.
777 struct GNUNET_FS_Handle *h;
780 * List of keywords that we're looking for.
782 struct GNUNET_FS_Uri *uri;
785 * For update-searches, link to the
786 * base-SKS search that triggered the
787 * update search; otherwise NULL.
789 struct GNUNET_FS_SearchContext *parent;
792 * Connection to the FS service.
794 struct GNUNET_CLIENT_Connection *client;
797 * Pointer we keep for the client.
802 * Map that contains a "struct SearchResult" for each result that
803 * was found in the search. The key for each entry is the XOR of
804 * the key and query in the CHK URI (as a unique identifier for the
807 struct GNUNET_CONTAINER_MultiHashMap *master_result_map;
810 * Per-keyword information for a keyword search.
811 * This array will have exactly as many entries
812 * as there were keywords.
814 struct SearchRequestEntry *requests;
819 struct GNUNET_TIME_Absolute start_time;
822 * ID of a task that is using this struct
823 * and that must be cancelled when the search
824 * is being stopped (if not GNUNET_SCHEDULER_NO_TASK).
825 * Used for the task that adds some artificial
826 * delay when trying to reconnect to the FS
829 GNUNET_SCHEDULER_TaskIdentifier task;
832 * Anonymity level for the search.
837 * Number of mandatory keywords in this query.
839 uint32_t mandatory_count;
844 * Information about an active download request.
846 struct DownloadRequest
849 * While pending, we keep all download requests
852 struct DownloadRequest *next;
855 * CHK for the request.
857 struct ContentHashKey chk;
860 * Offset of the corresponding block.
865 * Depth of the corresponding block in the tree.
870 * Set if this request is currently in the linked list of pending
871 * requests. Needed in case we get a response for a request that we
872 * have not yet send (due to FS bug or two blocks with identical
873 * content); in this case, we would need to remove the block from
874 * the pending list (and need a fast way to check if the block is on
883 * Context for controlling a download.
885 struct GNUNET_FS_DownloadContext
891 struct GNUNET_FS_Handle *h;
894 * Connection to the FS service.
896 struct GNUNET_CLIENT_Connection *client;
899 * Parent download (used when downloading files
902 struct GNUNET_FS_DownloadContext *parent;
905 * Context kept for the client.
910 * URI that identifies the file that
911 * we are downloading.
913 struct GNUNET_FS_Uri *uri;
916 * Known meta-data for the file (can be NULL).
918 struct GNUNET_CONTAINER_MetaData *meta;
921 * Error message, NULL if we're doing OK.
926 * Where are we writing the data (name of the
927 * file, can be NULL!).
932 * Map of active requests (those waiting
933 * for a response). The key is the hash
934 * of the encryped block (aka query).
936 struct GNUNET_CONTAINER_MultiHashMap *active;
939 * Linked list of pending requests.
941 struct DownloadRequest *pending;
944 * The file handle, NULL if we don't create
947 struct GNUNET_DISK_FileHandle *handle;
950 * Identity of the peer having the content, or all-zeros
951 * if we don't know of such a peer.
953 struct GNUNET_PeerIdentity target;
956 * ID of a task that is using this struct
957 * and that must be cancelled when the download
958 * is being stopped (if not GNUNET_SCHEDULER_NO_TASK).
959 * Used for the task that adds some artificial
960 * delay when trying to reconnect to the FS
963 GNUNET_SCHEDULER_TaskIdentifier task;
966 * What was the size of the file on disk that we're downloading
967 * before we started? Used to detect if there is a point in
968 * checking an existing block on disk for matching the desired
969 * content. 0 if the file did not exist already.
971 uint64_t old_file_size;
974 * What is the first offset that we're interested
980 * How many bytes starting from offset are desired?
981 * This is NOT the overall length of the file!
986 * How many bytes have we already received within
987 * the specified range (DBlocks only).
992 * Time download was started.
994 struct GNUNET_TIME_Absolute start_time;
997 * Desired level of anonymity.
1002 * The depth of the file-tree.
1004 unsigned int treedepth;
1007 * Options for the download.
1009 enum GNUNET_FS_DownloadOptions options;
1013 struct GNUNET_FS_Namespace
1017 * Private key for the namespace.
1019 struct GNUNET_CRYPTO_RsaPrivateKey *key;
1022 * Reference counter.
1029 * @brief index block (indexing a DBlock that
1030 * can be obtained directly from reading
1031 * the plaintext file)
1033 struct OnDemandBlock
1036 * Hash code of the entire content of the
1037 * file that was indexed (used to uniquely
1038 * identify the plaintext file).
1040 GNUNET_HashCode file_id;
1043 * At which offset should we be able to find
1044 * this on-demand encoded block?
1046 uint64_t offset GNUNET_PACKED;
1052 * @brief keyword block (advertising data under a keyword)
1058 * GNUNET_RSA_Signature using RSA-key generated from search keyword.
1060 struct GNUNET_CRYPTO_RsaSignature signature;
1063 * What is being signed and why?
1065 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
1068 * Key generated (!) from the H(keyword) as the seed!
1070 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded keyspace;
1072 /* 0-terminated URI here */
1074 /* variable-size Meta-Data follows here */
1079 * @brief namespace content block (advertising data under an identifier in a namespace)
1085 * GNUNET_RSA_Signature using RSA-key of the namespace
1087 struct GNUNET_CRYPTO_RsaSignature signature;
1090 * What is being signed and why?
1092 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
1095 * Hash of the hash of the human-readable identifier used for
1096 * this entry (the hash of the human-readable identifier is
1097 * used as the key for decryption; the xor of this identifier
1098 * and the hash of the "keyspace" is the datastore-query hash).
1100 GNUNET_HashCode identifier;
1103 * Public key of the namespace.
1105 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded subspace;
1107 /* 0-terminated update-identifier here */
1109 /* 0-terminated URI here */
1111 /* variable-size Meta-Data follows here */
1117 * Message sent from a GNUnet (fs) publishing
1118 * activity to the gnunet-fs-service to
1119 * initiate indexing of a file. The service
1120 * is supposed to check if the specified file
1121 * is available and has the same cryptographic
1122 * hash. It should then respond with either
1123 * a confirmation or a denial.
1125 * On OSes where this works, it is considered
1126 * acceptable if the service only checks that
1127 * the path, device and inode match (it can
1128 * then be assumed that the hash will also match
1129 * without actually computing it; this is an
1130 * optimization that should be safe given that
1131 * the client is not our adversary).
1133 struct IndexStartMessage
1137 * Message type will be
1138 * GNUNET_MESSAGE_TYPE_FS_INDEX_START.
1140 struct GNUNET_MessageHeader header;
1143 * ID of device containing the file, as seen by the client. This
1144 * device ID is obtained using a call like "statvfs" (and converting
1145 * the "f_fsid" field to a 32-bit big-endian number). Use 0 if the
1146 * OS does not support this, in which case the service must do a
1147 * full hash recomputation.
1149 uint32_t device GNUNET_PACKED;
1152 * Inode of the file on the given device, as seen by the client
1153 * ("st_ino" field from "struct stat"). Use 0 if the OS does not
1154 * support this, in which case the service must do a full hash
1157 uint64_t inode GNUNET_PACKED;
1160 * Hash of the file that we would like to index.
1162 GNUNET_HashCode file_id;
1164 /* this is followed by a 0-terminated
1165 filename of a file with the hash
1166 "file_id" as seen by the client */
1172 * Message send by FS service in response to a request
1173 * asking for a list of all indexed files.
1175 struct IndexInfoMessage
1178 * Message type will be
1179 * GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY.
1181 struct GNUNET_MessageHeader header;
1186 uint32_t reserved GNUNET_PACKED;
1189 * Hash of the indexed file.
1191 GNUNET_HashCode file_id;
1193 /* this is followed by a 0-terminated
1194 filename of a file with the hash
1195 "file_id" as seen by the client */
1201 * Message sent from a GNUnet (fs) unindexing
1202 * activity to the gnunet-fs-service to
1203 * indicate that a file will be unindexed. The service
1204 * is supposed to remove the file from the
1205 * list of indexed files and response with
1206 * a confirmation message (even if the file
1207 * was already not on the list).
1209 struct UnindexMessage
1213 * Message type will be
1214 * GNUNET_MESSAGE_TYPE_FS_UNINDEX.
1216 struct GNUNET_MessageHeader header;
1221 uint32_t reserved GNUNET_PACKED;
1224 * Hash of the file that we will unindex.
1226 GNUNET_HashCode file_id;
1232 * Message sent from a GNUnet (fs) search
1233 * activity to the gnunet-fs-service to
1236 struct SearchMessage
1240 * Message type will be
1241 * GNUNET_MESSAGE_TYPE_FS_START_SEARCH.
1243 struct GNUNET_MessageHeader header;
1248 int32_t reserved GNUNET_PACKED;
1251 * Type of the content that we're looking for.
1254 uint32_t type GNUNET_PACKED;
1257 * Desired anonymity level, big-endian.
1259 uint32_t anonymity_level GNUNET_PACKED;
1262 * If the request is for a DBLOCK or IBLOCK, this is the identity of
1263 * the peer that is known to have a response. Set to all-zeros if
1264 * such a target is not known (note that even if OUR anonymity
1265 * level is >0 we may happen to know the responder's identity;
1266 * nevertheless, we should probably not use it for a DHT-lookup
1267 * or similar blunt actions in order to avoid exposing ourselves).
1269 * If the request is for an SBLOCK, this is the identity of the
1270 * pseudonym to which the SBLOCK belongs.
1272 * If the request is for a KBLOCK, "target" must be all zeros.
1274 GNUNET_HashCode target;
1277 * Hash of the keyword (aka query) for KBLOCKs; Hash of
1278 * the CHK-encoded block for DBLOCKS and IBLOCKS (aka query)
1279 * and hash of the identifier XORed with the target for
1280 * SBLOCKS (aka query).
1282 GNUNET_HashCode query;
1284 /* this is followed by the hash codes of already-known
1285 results (which should hence be excluded from what
1286 the service returns); naturally, this only applies
1287 to queries that can have multiple results, such as
1288 those for KBLOCKS (KSK) and SBLOCKS (SKS) */
1293 * Response from FS service with a result for
1294 * a previous FS search. Note that queries
1295 * for DBLOCKS and IBLOCKS that have received
1296 * a single response are considered done.
1298 struct ContentMessage
1302 * Message type will be
1303 * GNUNET_MESSAGE_TYPE_FS_CONTENT.
1305 struct GNUNET_MessageHeader header;
1308 * Type of the content that was found,
1309 * should never be 0.
1311 uint32_t type GNUNET_PACKED;
1314 * When will this result expire?
1316 struct GNUNET_TIME_AbsoluteNBO expiration;
1318 /* followed by the actual block of data */
1323 * Only the (mandatory) query is included.
1325 #define GET_MESSAGE_BIT_QUERY_ONLY 0
1328 * The peer identity of a peer waiting for the
1329 * reply is included (used if the response
1330 * should be transmitted to someone other than
1331 * the sender of the GET).
1333 #define GET_MESSAGE_BIT_RETURN_TO 1
1336 * The hash of the public key of the target
1337 * namespace is included (for SKS queries).
1339 #define GET_MESSAGE_BIT_SKS_NAMESPACE 2
1342 * The peer identity of a peer that had claimed to have the content
1343 * previously is included (can be used if responder-anonymity is not
1344 * desired; note that the precursor presumably lacked a direct
1345 * connection to the specified peer; still, the receiver is in no way
1346 * required to limit forwarding only to the specified peer, it should
1347 * only prefer it somewhat if possible).
1349 #define GET_MESSAGE_BIT_TRANSMIT_TO 4
1353 * Message sent between peers asking for FS-content.
1359 * Message type will be GNUNET_MESSAGE_TYPE_FS_GET.
1361 struct GNUNET_MessageHeader header;
1364 * Type of the query (block type).
1366 uint32_t type GNUNET_PACKED;
1369 * How important is this request (network byte order)
1371 uint32_t priority GNUNET_PACKED;
1374 * Relative time to live in GNUNET_CRON_MILLISECONDS (network byte order)
1376 int32_t ttl GNUNET_PACKED;
1379 * The content hash should be mutated using this value
1380 * before checking against the bloomfilter (used to
1381 * get many different filters for the same hash codes).
1382 * The number should be in big-endian format when used
1385 int32_t filter_mutator GNUNET_PACKED;
1388 * Which of the optional hash codes are present at the end of the
1389 * message? See GET_MESSAGE_BIT_xx constants. For each bit that is
1390 * set, an additional GNUNET_HashCode with the respective content
1391 * (in order of the bits) will be appended to the end of the GET
1394 uint32_t hash_bitmap GNUNET_PACKED;
1397 * Hashcodes of the file(s) we're looking for.
1398 * Details depend on the query type.
1400 GNUNET_HashCode query GNUNET_PACKED;
1402 /* this is followed by hash codes
1403 as specified in the "hash_bitmap";
1404 after that, an optional bloomfilter
1405 (with bits set for replies that should
1406 be suppressed) can be present */
1411 * Message sent between peers providing FS-content.
1417 * Message type will be GNUNET_MESSAGE_TYPE_FS_PUT.
1419 struct GNUNET_MessageHeader header;
1422 * Type of the block (in big endian).
1424 uint32_t type GNUNET_PACKED;
1427 * When does this result expire?
1429 struct GNUNET_TIME_RelativeNBO expiration;
1431 /* this is followed by the actual encrypted content */