/* This file is part of GNUnet. Copyright (C) 2003--2012 GNUnet e.V. GNUnet is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. */ /** * @file fs/fs.h * @brief definitions for the entire fs module * @author Igor Wronsky, Christian Grothoff */ #ifndef FS_H #define FS_H #include "gnunet_constants.h" #include "gnunet_datastore_service.h" #include "gnunet_dht_service.h" #include "gnunet_fs_service.h" #include "gnunet_block_lib.h" #include "block_fs.h" /** * Size of the individual blocks used for file-sharing. */ #define DBLOCK_SIZE (32 * 1024) /** * Blocksize to use when hashing files for indexing (blocksize for IO, * not for the DBlocks). Larger blocksizes can be more efficient but * will be more disruptive as far as the scheduler is concerned. */ #define HASHING_BLOCKSIZE (1024 * 128) /** * @brief content hash key */ struct ContentHashKey { /** * Hash of the original content, used for encryption. */ struct GNUNET_HashCode key; /** * Hash of the encrypted content, used for querying. */ struct GNUNET_HashCode query; }; GNUNET_NETWORK_STRUCT_BEGIN /** * Message sent from a GNUnet (fs) publishing activity to sign * a LOC URI. */ struct RequestLocSignatureMessage { /** * Message type will be #GNUNET_MESSAGE_TYPE_FS_REQUEST_LOC_SIGN. */ struct GNUNET_MessageHeader header; /** * Requested signature purpose. For now, always * #GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT. */ uint32_t purpose GNUNET_PACKED; /** * Requested expiration time. */ struct GNUNET_TIME_AbsoluteNBO expiration_time; /** * Information about the shared file (to be signed). */ struct ContentHashKey chk; /** * Size of the shared file (to be signed). */ uint64_t file_length; }; /** * Message sent from the service with the signed LOC URI. */ struct ResponseLocSignatureMessage { /** * Message type will be * #GNUNET_MESSAGE_TYPE_FS_REQUEST_LOC_SIGNATURE. */ struct GNUNET_MessageHeader header; /** * Purpose of the generated signature. For now, always * #GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT. */ uint32_t purpose GNUNET_PACKED; /** * Expiration time that was actually used (rounded!). */ struct GNUNET_TIME_AbsoluteNBO expiration_time; /** * The requested signature. */ struct GNUNET_CRYPTO_EddsaSignature signature; /** * Identity of the peer sharing the file. */ struct GNUNET_PeerIdentity peer; }; /** * Message sent from a GNUnet (fs) publishing activity to the * gnunet-fs-service to initiate indexing of a file. The service is * supposed to check if the specified file is available and has the * same cryptographic hash. It should then respond with either a * confirmation or a denial. * * On OSes where this works, it is considered acceptable if the * service only checks that the path, device and inode match (it can * then be assumed that the hash will also match without actually * computing it; this is an optimization that should be safe given * that the client is not our adversary). */ struct IndexStartMessage { /** * Message type will be #GNUNET_MESSAGE_TYPE_FS_INDEX_START. */ struct GNUNET_MessageHeader header; /** * For alignment. */ uint32_t reserved GNUNET_PACKED; /** * ID of device containing the file, as seen by the client. This * device ID is obtained using a call like "statvfs" (and converting * the "f_fsid" field to a 32-bit big-endian number). Use 0 if the * OS does not support this, in which case the service must do a * full hash recomputation. */ uint64_t device GNUNET_PACKED; /** * Inode of the file on the given device, as seen by the client * ("st_ino" field from "struct stat"). Use 0 if the OS does not * support this, in which case the service must do a full hash * recomputation. */ uint64_t inode GNUNET_PACKED; /** * Hash of the file that we would like to index. */ struct GNUNET_HashCode file_id; /* this is followed by a 0-terminated * filename of a file with the hash * "file_id" as seen by the client */ }; /** * Message send by FS service in response to a request * asking for a list of all indexed files. */ struct IndexInfoMessage { /** * Message type will be * #GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY. */ struct GNUNET_MessageHeader header; /** * Always zero. */ uint32_t reserved GNUNET_PACKED; /** * Hash of the indexed file. */ struct GNUNET_HashCode file_id; /* this is followed by a 0-terminated * filename of a file with the hash * "file_id" as seen by the client */ }; /** * Message sent from a GNUnet (fs) unindexing activity to the * gnunet-service-fs to indicate that a file will be unindexed. The * service is supposed to remove the file from the list of indexed * files and response with a confirmation message (even if the file * was already not on the list). */ struct UnindexMessage { /** * Message type will be #GNUNET_MESSAGE_TYPE_FS_UNINDEX. */ struct GNUNET_MessageHeader header; /** * Always zero. */ uint32_t reserved GNUNET_PACKED; /** * Hash of the file that we will unindex. */ struct GNUNET_HashCode file_id; }; /** * No options. */ #define SEARCH_MESSAGE_OPTION_NONE 0 /** * Only search the local datastore (no network) */ #define SEARCH_MESSAGE_OPTION_LOOPBACK_ONLY 1 /** * Request is too large to fit in 64k format. The list of * already-known search results will be continued in another message * for the same type/query/target and additional already-known results * following this one). */ #define SEARCH_MESSAGE_OPTION_CONTINUED 2 /** * Message sent from a GNUnet (fs) search activity to the * gnunet-service-fs to start a search. */ struct SearchMessage { /** * Message type will be #GNUNET_MESSAGE_TYPE_FS_START_SEARCH. */ struct GNUNET_MessageHeader header; /** * Bitmask with options. Zero for no options, one for * loopback-only, two for 'to be continued' (with a second search * message for the same type/query/target and additional * already-known results following this one). See * SEARCH_MESSAGE_OPTION_ defines. * * Other bits are currently not defined. */ uint32_t options GNUNET_PACKED; /** * Type of the content that we're looking for. */ uint32_t type GNUNET_PACKED; /** * Desired anonymity level, big-endian. */ uint32_t anonymity_level GNUNET_PACKED; /** * If the request is for a DBLOCK or IBLOCK, this is the identity of * the peer that is known to have a response. Set to all-zeros if * such a target is not known (note that even if OUR anonymity * level is >0 we may happen to know the responder's identity; * nevertheless, we should probably not use it for a DHT-lookup * or similar blunt actions in order to avoid exposing ourselves). *

* Otherwise, "target" must be all zeros. */ struct GNUNET_PeerIdentity target; /** * Hash of the public key for UBLOCKs; Hash of * the CHK-encoded block for DBLOCKS and IBLOCKS. */ struct GNUNET_HashCode query; /* this is followed by the hash codes of already-known * results (which should hence be excluded from what * the service returns); naturally, this only applies * to queries that can have multiple results (UBLOCKS). */ }; /** * Response from FS service with a result for a previous FS search. * Note that queries for DBLOCKS and IBLOCKS that have received a * single response are considered done. This message is transmitted * between peers. */ struct PutMessage { /** * Message type will be #GNUNET_MESSAGE_TYPE_FS_PUT. */ struct GNUNET_MessageHeader header; /** * Type of the block (in big endian). Should never be zero. */ uint32_t type GNUNET_PACKED; /** * When does this result expire? */ struct GNUNET_TIME_AbsoluteNBO expiration; /* this is followed by the actual encrypted content */ }; /** * Response from FS service with a result for a previous FS search. * Note that queries for DBLOCKS and IBLOCKS that have received a * single response are considered done. This message is transmitted * between the service and a client. */ struct ClientPutMessage { /** * Message type will be #GNUNET_MESSAGE_TYPE_FS_PUT. */ struct GNUNET_MessageHeader header; /** * Type of the block (in big endian). Should never be zero. */ uint32_t type GNUNET_PACKED; /** * When does this result expire? */ struct GNUNET_TIME_AbsoluteNBO expiration; /** * When was the last time we've tried to download this block? * (FOREVER if unknown/not relevant) */ struct GNUNET_TIME_AbsoluteNBO last_transmission; /** * How often did we transmit this query before getting an * answer (estimate). */ uint32_t num_transmissions; /** * How much respect did we offer (in total) before getting an * answer (estimate). */ uint32_t respect_offered; /* this is followed by the actual encrypted content */ }; GNUNET_NETWORK_STRUCT_END #endif /* end of fs.h */