/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008 Christian Grothoff (and other contributing authors)
+ (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
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 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
*/
/**
* @file fs/fs_download.c
- * @brief DOWNLOAD helper methods (which do the real work).
+ * @brief download methods
* @author Christian Grothoff
+ *
+ * TODO:
+ * - different priority for scheduling probe downloads?
+ * - check if iblocks can be computed from existing blocks (can wait, hard)
*/
-
#include "platform.h"
+#include "gnunet_constants.h"
#include "gnunet_fs_service.h"
#include "fs.h"
+#include "fs_tree.h"
-#define DEBUG_DOWNLOAD GNUNET_YES
+#define DEBUG_DOWNLOAD GNUNET_NO
+/**
+ * Determine if the given download (options and meta data) should cause
+ * use to try to do a recursive download.
+ */
+static int
+is_recursive_download (struct GNUNET_FS_DownloadContext *dc)
+{
+ return (0 != (dc->options & GNUNET_FS_DOWNLOAD_OPTION_RECURSIVE)) &&
+ ( (GNUNET_YES == GNUNET_FS_meta_data_test_for_directory (dc->meta)) ||
+ ( (dc->meta == NULL) &&
+ ( (NULL == dc->filename) ||
+ ( (strlen (dc->filename) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
+ (NULL !=
+ strstr (dc->filename + strlen(dc->filename) - strlen(GNUNET_FS_DIRECTORY_EXT),
+ GNUNET_FS_DIRECTORY_EXT)) ) ) ) );
+}
/**
- * Download parts of a file. Note that this will store
- * the blocks at the respective offset in the given file. Also, the
- * download is still using the blocking of the underlying FS
- * encoding. As a result, the download may *write* outside of the
- * given boundaries (if offset and length do not match the 32k FS
- * block boundaries). <p>
+ * We're storing the IBLOCKS after the DBLOCKS on disk (so that we
+ * only have to truncate the file once we're done).
*
- * This function should be used to focus a download towards a
- * particular portion of the file (optimization), not to strictly
- * limit the download to exactly those bytes.
- *
- * @param h handle to the file sharing subsystem
- * @param uri the URI of the file (determines what to download); CHK or LOC URI
- * @param filename where to store the file, maybe NULL (then no file is
- * created on disk and data must be grabbed from the callbacks)
- * @param offset at what offset should we start the download (typically 0)
- * @param length how many bytes should be downloaded starting at offset
- * @param anonymity anonymity level to use for the download
- * @param no_temporaries set to GNUNET_YES to disallow generation of temporary files
- * @param recursive should this be a recursive download (useful for directories
- * to automatically trigger download of files in the directories)
- * @param parent parent download to associate this download with (use NULL
- * for top-level downloads; useful for manually-triggered recursive downloads)
- * @return context that can be used to control this download
+ * Given the offset of a block (with respect to the DBLOCKS) and its
+ * depth, return the offset where we would store this block in the
+ * file.
+ *
+ * @param fsize overall file size
+ * @param off offset of the block in the file
+ * @param depth depth of the block in the tree
+ * @param treedepth maximum depth of the tree
+ * @return off for DBLOCKS (depth == treedepth),
+ * otherwise an offset past the end
+ * of the file that does not overlap
+ * with the range for any other block
*/
-struct GNUNET_FS_DownloadContext *
-GNUNET_FS_file_download_start (struct GNUNET_FS_Handle *h,
- const struct GNUNET_FS_Uri *uri,
- const char *filename,
- unsigned long long offset,
- unsigned long long length,
- unsigned int anonymity,
- int no_temporaries,
- int recursive,
- struct GNUNET_FS_DownloadContext *parent)
+static uint64_t
+compute_disk_offset (uint64_t fsize,
+ uint64_t off,
+ unsigned int depth,
+ unsigned int treedepth)
{
- return NULL;
+ unsigned int i;
+ uint64_t lsize; /* what is the size of all IBlocks for depth "i"? */
+ uint64_t loff; /* where do IBlocks for depth "i" start? */
+ unsigned int ioff; /* which IBlock corresponds to "off" at depth "i"? */
+
+ if (depth == treedepth)
+ return off;
+ /* first IBlocks start at the end of file, rounded up
+ to full DBLOCK_SIZE */
+ loff = ((fsize + DBLOCK_SIZE - 1) / DBLOCK_SIZE) * DBLOCK_SIZE;
+ lsize = ( (fsize + DBLOCK_SIZE-1) / DBLOCK_SIZE) * sizeof (struct ContentHashKey);
+ GNUNET_assert (0 == (off % DBLOCK_SIZE));
+ ioff = (off / DBLOCK_SIZE);
+ for (i=treedepth-1;i>depth;i--)
+ {
+ loff += lsize;
+ lsize = (lsize + CHK_PER_INODE - 1) / CHK_PER_INODE;
+ GNUNET_assert (lsize > 0);
+ GNUNET_assert (0 == (ioff % CHK_PER_INODE));
+ ioff /= CHK_PER_INODE;
+ }
+ return loff + ioff * sizeof (struct ContentHashKey);
}
+
/**
- * Stop a download (aborts if download is incomplete).
+ * Given a file of the specified treedepth and a block at the given
+ * offset and depth, calculate the offset for the CHK at the given
+ * index.
*
- * @param rm handle for the download
- * @param do_delete delete files of incomplete downloads
+ * @param offset the offset of the first
+ * DBLOCK in the subtree of the
+ * identified IBLOCK
+ * @param depth the depth of the IBLOCK in the tree
+ * @param treedepth overall depth of the tree
+ * @param k which CHK in the IBLOCK are we
+ * talking about
+ * @return offset if k=0, otherwise an appropriately
+ * larger value (i.e., if depth = treedepth-1,
+ * the returned value should be offset+DBLOCK_SIZE)
*/
-void
-GNUNET_FS_file_download_stop (struct GNUNET_FS_DownloadContext *rm,
- int do_delete)
+static uint64_t
+compute_dblock_offset (uint64_t offset,
+ unsigned int depth,
+ unsigned int treedepth,
+ unsigned int k)
{
+ unsigned int i;
+ uint64_t lsize; /* what is the size of the sum of all DBlocks
+ that a CHK at depth i corresponds to? */
+
+ if (depth == treedepth)
+ return offset;
+ lsize = DBLOCK_SIZE;
+ for (i=treedepth-1;i>depth;i--)
+ lsize *= CHK_PER_INODE;
+ return offset + k * lsize;
}
+/**
+ * Fill in all of the generic fields for a download event and call the
+ * callback.
+ *
+ * @param pi structure to fill in
+ * @param dc overall download context
+ */
+void
+GNUNET_FS_download_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
+ struct GNUNET_FS_DownloadContext *dc)
+{
+ pi->value.download.dc = dc;
+ pi->value.download.cctx
+ = dc->client_info;
+ pi->value.download.pctx
+ = (dc->parent == NULL) ? NULL : dc->parent->client_info;
+ pi->value.download.sctx
+ = (dc->search == NULL) ? NULL : dc->search->client_info;
+ pi->value.download.uri
+ = dc->uri;
+ pi->value.download.filename
+ = dc->filename;
+ pi->value.download.size
+ = dc->length;
+ pi->value.download.duration
+ = GNUNET_TIME_absolute_get_duration (dc->start_time);
+ pi->value.download.completed
+ = dc->completed;
+ pi->value.download.anonymity
+ = dc->anonymity;
+ pi->value.download.eta
+ = GNUNET_TIME_calculate_eta (dc->start_time,
+ dc->completed,
+ dc->length);
+ pi->value.download.is_active = (dc->client == NULL) ? GNUNET_NO : GNUNET_YES;
+ if (0 == (dc->options & GNUNET_FS_DOWNLOAD_IS_PROBE))
+ dc->client_info = dc->h->upcb (dc->h->upcb_cls,
+ pi);
+ else
+ dc->client_info = GNUNET_FS_search_probe_progress_ (NULL,
+ pi);
+}
+/**
+ * We're ready to transmit a search request to the
+ * file-sharing service. Do it. If there is
+ * more than one request pending, try to send
+ * multiple or request another transmission.
+ *
+ * @param cls closure
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+transmit_download_request (void *cls,
+ size_t size,
+ void *buf);
-#if 0
/**
- * Node-specific data (not shared, keep small!). 152 bytes.
- * Nodes are kept in a doubly-linked list.
+ * Closure for iterator processing results.
*/
-struct Node
+struct ProcessResultClosure
{
+
/**
- * Pointer to shared data between all nodes (request manager,
- * progress data, etc.).
+ * Hash of data.
*/
- struct GNUNET_ECRS_DownloadContext *ctx;
+ GNUNET_HashCode query;
/**
- * Previous entry in DLL.
- */
- struct Node *prev;
+ * Data found in P2P network.
+ */
+ const void *data;
/**
- * Next entry in DLL.
+ * Our download context.
*/
- struct Node *next;
-
+ struct GNUNET_FS_DownloadContext *dc;
+
/**
- * What is the GNUNET_EC_ContentHashKey for this block?
+ * Number of bytes in data.
*/
- GNUNET_EC_ContentHashKey chk;
+ size_t size;
/**
- * At what offset (on the respective level!) is this
- * block?
+ * Type of data.
*/
- unsigned long long offset;
+ enum GNUNET_BLOCK_Type type;
/**
- * 0 for dblocks, >0 for iblocks.
+ * Flag to indicate if this block should be stored on disk.
*/
- unsigned int level;
-
+ int do_store;
+
};
+
/**
- * @brief structure that keeps track of currently pending requests for
- * a download
+ * Iterator over entries in the pending requests in the 'active' map for the
+ * reply that we just got.
*
- * Handle to the state of a request manager. Here we keep track of
- * which queries went out with which priorities and which nodes in
- * the merkle-tree are waiting for the replies.
+ * @param cls closure (our 'struct ProcessResultClosure')
+ * @param key query for the given value / request
+ * @param value value in the hash map (a 'struct DownloadRequest')
+ * @return GNUNET_YES (we should continue to iterate); unless serious error
*/
-struct GNUNET_ECRS_DownloadContext
-{
+static int
+process_result_with_request (void *cls,
+ const GNUNET_HashCode * key,
+ void *value);
- /**
- * Total number of bytes in the file.
- */
- unsigned long long total;
- /**
- * Number of bytes already obtained
- */
- unsigned long long completed;
+/**
+ * We've found a matching block without downloading it.
+ * Encrypt it and pass it to our "receive" function as
+ * if we had received it from the network.
+ *
+ * @param dc download in question
+ * @param chk request this relates to
+ * @param sm request details
+ * @param block plaintext data matching request
+ * @param len number of bytes in block
+ * @param depth depth of the block
+ * @param do_store should we still store the block on disk?
+ * @return GNUNET_OK on success
+ */
+static int
+encrypt_existing_match (struct GNUNET_FS_DownloadContext *dc,
+ const struct ContentHashKey *chk,
+ struct DownloadRequest *sm,
+ const char * block,
+ size_t len,
+ int depth,
+ int do_store)
+{
+ struct ProcessResultClosure prc;
+ char enc[len];
+ struct GNUNET_CRYPTO_AesSessionKey sk;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+ GNUNET_HashCode query;
+
+ GNUNET_CRYPTO_hash_to_aes_key (&chk->key, &sk, &iv);
+ if (-1 == GNUNET_CRYPTO_aes_encrypt (block, len,
+ &sk,
+ &iv,
+ enc))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_CRYPTO_hash (enc, len, &query);
+ if (0 != memcmp (&query,
+ &chk->query,
+ sizeof (GNUNET_HashCode)))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Matching block already present, no need for download!\n");
+#endif
+ /* already got it! */
+ prc.dc = dc;
+ prc.data = enc;
+ prc.size = len;
+ prc.type = (dc->treedepth == depth)
+ ? GNUNET_BLOCK_TYPE_DBLOCK
+ : GNUNET_BLOCK_TYPE_IBLOCK;
+ prc.query = chk->query;
+ prc.do_store = do_store;
+ process_result_with_request (&prc,
+ &chk->key,
+ sm);
+ return GNUNET_OK;
+}
- /**
- * Starting-offset in file (for partial download)
- */
- unsigned long long offset;
+/**
+ * Closure for match_full_data.
+ */
+struct MatchDataContext
+{
/**
- * Length of the download (starting at offset).
+ * CHK we are looking for.
*/
- unsigned long long length;
+ const struct ContentHashKey *chk;
/**
- * Time download was started.
+ * Download we're processing.
*/
- GNUNET_CronTime startTime;
+ struct GNUNET_FS_DownloadContext *dc;
/**
- * Doubly linked list of all pending requests (head)
+ * Request details.
*/
- struct Node *head;
+ struct DownloadRequest *sm;
/**
- * Doubly linked list of all pending requests (tail)
+ * Overall offset in the file.
*/
- struct Node *tail;
+ uint64_t offset;
/**
- * FSLIB context for issuing requests.
+ * Desired length of the block.
*/
- struct GNUNET_FS_SearchContext *sctx;
+ size_t len;
/**
- * Context for error reporting.
+ * Flag set to GNUNET_YES on success.
*/
- struct GNUNET_GE_Context *ectx;
+ int done;
+};
- /**
- * Configuration information.
- */
- struct GNUNET_GC_Configuration *cfg;
+/**
+ * Type of a function that libextractor calls for each
+ * meta data item found.
+ *
+ * @param cls closure (user-defined)
+ * @param plugin_name name of the plugin that produced this value;
+ * special values can be used (i.e. '<zlib>' for zlib being
+ * used in the main libextractor library and yielding
+ * meta data).
+ * @param type libextractor-type describing the meta data
+ * @param format basic format information about data
+ * @param data_mime_type mime-type of data (not of the original file);
+ * can be NULL (if mime-type is not known)
+ * @param data actual meta-data found
+ * @param data_len number of bytes in data
+ * @return 0 to continue extracting, 1 to abort
+ */
+static int
+match_full_data (void *cls,
+ const char *plugin_name,
+ enum EXTRACTOR_MetaType type,
+ enum EXTRACTOR_MetaFormat format,
+ const char *data_mime_type,
+ const char *data,
+ size_t data_len)
+{
+ struct MatchDataContext *mdc = cls;
+ GNUNET_HashCode key;
- /**
- * The file handle.
- */
- int handle;
+ if (type == EXTRACTOR_METATYPE_GNUNET_FULL_DATA)
+ {
+ if ( (mdc->offset > data_len) ||
+ (mdc->offset + mdc->len > data_len) )
+ return 1;
+ GNUNET_CRYPTO_hash (&data[mdc->offset],
+ mdc->len,
+ &key);
+ if (0 != memcmp (&key,
+ &mdc->chk->key,
+ sizeof (GNUNET_HashCode)))
+ {
+ GNUNET_break_op (0);
+ return 1;
+ }
+ /* match found! */
+ if (GNUNET_OK !=
+ encrypt_existing_match (mdc->dc,
+ mdc->chk,
+ mdc->sm,
+ &data[mdc->offset],
+ mdc->len,
+ 0,
+ GNUNET_YES))
+ {
+ GNUNET_break_op (0);
+ return 1;
+ }
+ mdc->done = GNUNET_YES;
+ return 1;
+ }
+ return 0;
+}
- /**
- * Do we exclusively own this sctx?
- */
- int my_sctx;
- /**
- * The base-filename
- */
- char *filename;
+/**
+ * Schedule the download of the specified block in the tree.
+ *
+ * @param dc overall download this block belongs to
+ * @param chk content-hash-key of the block
+ * @param offset offset of the block in the file
+ * (for IBlocks, the offset is the lowest
+ * offset of any DBlock in the subtree under
+ * the IBlock)
+ * @param depth depth of the block, 0 is the root of the tree
+ */
+static void
+schedule_block_download (struct GNUNET_FS_DownloadContext *dc,
+ const struct ContentHashKey *chk,
+ uint64_t offset,
+ unsigned int depth)
+{
+ struct DownloadRequest *sm;
+ uint64_t total;
+ uint64_t off;
+ size_t len;
+ char block[DBLOCK_SIZE];
+ GNUNET_HashCode key;
+ struct MatchDataContext mdc;
+ struct GNUNET_DISK_FileHandle *fh;
+
+ total = GNUNET_ntohll (dc->uri->data.chk.file_length);
+ len = GNUNET_FS_tree_calculate_block_size (total,
+ dc->treedepth,
+ offset,
+ depth);
+ off = compute_disk_offset (total,
+ offset,
+ depth,
+ dc->treedepth);
+ sm = GNUNET_malloc (sizeof (struct DownloadRequest));
+ sm->chk = *chk;
+ sm->offset = offset;
+ sm->depth = depth;
+ sm->is_pending = GNUNET_YES;
+ sm->next = dc->pending;
+ dc->pending = sm;
+ GNUNET_CONTAINER_multihashmap_put (dc->active,
+ &chk->query,
+ sm,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ if ( (dc->tried_full_data == GNUNET_NO) &&
+ (depth == 0) )
+ {
+ mdc.dc = dc;
+ mdc.sm = sm;
+ mdc.chk = chk;
+ mdc.offset = offset;
+ mdc.len = len;
+ mdc.done = GNUNET_NO;
+ GNUNET_CONTAINER_meta_data_iterate (dc->meta,
+ &match_full_data,
+ &mdc);
+ if (mdc.done == GNUNET_YES)
+ return;
+ dc->tried_full_data = GNUNET_YES;
+ }
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Scheduling download at offset %llu and depth %u for `%s'\n",
+ (unsigned long long) offset,
+ depth,
+ GNUNET_h2s (&chk->query));
+#endif
+ fh = NULL;
+ if ( (dc->old_file_size > off) &&
+ (dc->filename != NULL) )
+ fh = GNUNET_DISK_file_open (dc->filename,
+ GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
+ if ( (fh != NULL) &&
+ (off ==
+ GNUNET_DISK_file_seek (fh,
+ off,
+ GNUNET_DISK_SEEK_SET) ) &&
+ (len ==
+ GNUNET_DISK_file_read (fh,
+ block,
+ len)) )
+ {
+ GNUNET_CRYPTO_hash (block, len, &key);
+ if ( (0 == memcmp (&key,
+ &chk->key,
+ sizeof (GNUNET_HashCode))) &&
+ (GNUNET_OK ==
+ encrypt_existing_match (dc,
+ chk,
+ sm,
+ block,
+ len,
+ depth,
+ GNUNET_NO)) )
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
+ return;
+ }
+ }
+ if (fh != NULL)
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
+ if (depth < dc->treedepth)
+ {
+ // FIXME: try if we could
+ // reconstitute this IBLOCK
+ // from the existing blocks on disk (can wait)
+ // (read block(s), encode, compare with
+ // query; if matches, simply return)
+ }
- /**
- * Main thread running the operation.
- */
- struct GNUNET_ThreadHandle *main;
+ if ( (dc->th == NULL) &&
+ (dc->client != NULL) )
+ {
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking for transmission to FS service\n");
+#endif
+ dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
+ sizeof (struct SearchMessage),
+ GNUNET_CONSTANTS_SERVICE_TIMEOUT,
+ GNUNET_NO,
+ &transmit_download_request,
+ dc);
+ }
+ else
+ {
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission request not issued (%p %p)\n",
+ dc->th,
+ dc->client);
+#endif
- /**
- * Function to call when we make progress.
- */
- GNUNET_ECRS_DownloadProgressCallback dpcb;
+ }
- /**
- * Extra argument to dpcb.
- */
- void *dpcbClosure;
+}
- /**
- * Identity of the peer having the content, or all-zeros
- * if we don't know of such a peer.
- */
- GNUNET_PeerIdentity target;
- /**
- * Abort? Flag that can be set at any time
- * to abort the RM as soon as possible. Set
- * to GNUNET_YES during orderly shutdown,
- * set to GNUNET_SYSERR on error.
- */
- int abortFlag;
- /**
- * Do we have a specific peer from which we download
- * from?
- */
- int have_target;
+/**
+ * Suggest a filename based on given metadata.
+ *
+ * @param md given meta data
+ * @return NULL if meta data is useless for suggesting a filename
+ */
+char *
+GNUNET_FS_meta_data_suggest_filename (const struct GNUNET_CONTAINER_MetaData *md)
+{
+ static const char *mimeMap[][2] = {
+ {"application/bz2", ".bz2"},
+ {"application/gnunet-directory", ".gnd"},
+ {"application/java", ".class"},
+ {"application/msword", ".doc"},
+ {"application/ogg", ".ogg"},
+ {"application/pdf", ".pdf"},
+ {"application/pgp-keys", ".key"},
+ {"application/pgp-signature", ".pgp"},
+ {"application/postscript", ".ps"},
+ {"application/rar", ".rar"},
+ {"application/rtf", ".rtf"},
+ {"application/xml", ".xml"},
+ {"application/x-debian-package", ".deb"},
+ {"application/x-dvi", ".dvi"},
+ {"applixation/x-flac", ".flac"},
+ {"applixation/x-gzip", ".gz"},
+ {"application/x-java-archive", ".jar"},
+ {"application/x-java-vm", ".class"},
+ {"application/x-python-code", ".pyc"},
+ {"application/x-redhat-package-manager", ".rpm"},
+ {"application/x-rpm", ".rpm"},
+ {"application/x-tar", ".tar"},
+ {"application/x-tex-pk", ".pk"},
+ {"application/x-texinfo", ".texinfo"},
+ {"application/x-xcf", ".xcf"},
+ {"application/x-xfig", ".xfig"},
+ {"application/zip", ".zip"},
+
+ {"audio/midi", ".midi"},
+ {"audio/mpeg", ".mp3"},
+ {"audio/real", ".rm"},
+ {"audio/x-wav", ".wav"},
+
+ {"image/gif", ".gif"},
+ {"image/jpeg", ".jpg"},
+ {"image/pcx", ".pcx"},
+ {"image/png", ".png"},
+ {"image/tiff", ".tiff"},
+ {"image/x-ms-bmp", ".bmp"},
+ {"image/x-xpixmap", ".xpm"},
+
+ {"text/css", ".css"},
+ {"text/html", ".html"},
+ {"text/plain", ".txt"},
+ {"text/rtf", ".rtf"},
+ {"text/x-c++hdr", ".h++"},
+ {"text/x-c++src", ".c++"},
+ {"text/x-chdr", ".h"},
+ {"text/x-csrc", ".c"},
+ {"text/x-java", ".java"},
+ {"text/x-moc", ".moc"},
+ {"text/x-pascal", ".pas"},
+ {"text/x-perl", ".pl"},
+ {"text/x-python", ".py"},
+ {"text/x-tex", ".tex"},
+
+ {"video/avi", ".avi"},
+ {"video/mpeg", ".mpeg"},
+ {"video/quicktime", ".qt"},
+ {"video/real", ".rm"},
+ {"video/x-msvideo", ".avi"},
+ {NULL, NULL},
+ };
+ char *ret;
+ unsigned int i;
+ char *mime;
+ char *base;
+ const char *ext;
+
+ ret = GNUNET_CONTAINER_meta_data_get_by_type (md,
+ EXTRACTOR_METATYPE_FILENAME);
+ if (ret != NULL)
+ return ret;
+ ext = NULL;
+ mime = GNUNET_CONTAINER_meta_data_get_by_type (md,
+ EXTRACTOR_METATYPE_MIMETYPE);
+ if (mime != NULL)
+ {
+ i = 0;
+ while ( (mimeMap[i][0] != NULL) &&
+ (0 != strcmp (mime, mimeMap[i][0])))
+ i++;
+ if (mimeMap[i][1] == NULL)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG |
+ GNUNET_ERROR_TYPE_BULK,
+ _("Did not find mime type `%s' in extension list.\n"),
+ mime);
+ else
+ ext = mimeMap[i][1];
+ GNUNET_free (mime);
+ }
+ base = GNUNET_CONTAINER_meta_data_get_first_by_types (md,
+ EXTRACTOR_METATYPE_TITLE,
+ EXTRACTOR_METATYPE_BOOK_TITLE,
+ EXTRACTOR_METATYPE_ORIGINAL_TITLE,
+ EXTRACTOR_METATYPE_PACKAGE_NAME,
+ EXTRACTOR_METATYPE_URL,
+ EXTRACTOR_METATYPE_URI,
+ EXTRACTOR_METATYPE_DESCRIPTION,
+ EXTRACTOR_METATYPE_ISRC,
+ EXTRACTOR_METATYPE_JOURNAL_NAME,
+ EXTRACTOR_METATYPE_AUTHOR_NAME,
+ EXTRACTOR_METATYPE_SUBJECT,
+ EXTRACTOR_METATYPE_ALBUM,
+ EXTRACTOR_METATYPE_ARTIST,
+ EXTRACTOR_METATYPE_KEYWORDS,
+ EXTRACTOR_METATYPE_COMMENT,
+ EXTRACTOR_METATYPE_UNKNOWN,
+ -1);
+ if ( (base == NULL) &&
+ (ext == NULL) )
+ return NULL;
+ if (base == NULL)
+ return GNUNET_strdup (ext);
+ if (ext == NULL)
+ return base;
+ GNUNET_asprintf (&ret,
+ "%s%s",
+ base,
+ ext);
+ GNUNET_free (base);
+ return ret;
+}
- /**
- * Desired anonymity level for the download.
- */
- unsigned int anonymityLevel;
- /**
- * The depth of the file-tree.
- */
- unsigned int treedepth;
+/**
+ * We've lost our connection with the FS service.
+ * Re-establish it and re-transmit all of our
+ * pending requests.
+ *
+ * @param dc download context that is having trouble
+ */
+static void
+try_reconnect (struct GNUNET_FS_DownloadContext *dc);
-};
-static int
-content_receive_callback (const GNUNET_HashCode * query,
- const GNUNET_DatastoreValue * reply, void *cls,
- unsigned long long uid);
+/**
+ * We found an entry in a directory. Check if the respective child
+ * already exists and if not create the respective child download.
+ *
+ * @param cls the parent download
+ * @param filename name of the file in the directory
+ * @param uri URI of the file (CHK or LOC)
+ * @param meta meta data of the file
+ * @param length number of bytes in data
+ * @param data contents of the file (or NULL if they were not inlined)
+ */
+static void
+trigger_recursive_download (void *cls,
+ const char *filename,
+ const struct GNUNET_FS_Uri *uri,
+ const struct GNUNET_CONTAINER_MetaData *meta,
+ size_t length,
+ const void *data);
/**
- * Close the files and free the associated resources.
+ * We're done downloading a directory. Open the file and
+ * trigger all of the (remaining) child downloads.
*
- * @param self reference to the download context
+ * @param dc context of download that just completed
*/
static void
-free_request_manager (struct GNUNET_ECRS_DownloadContext *rm)
+full_recursive_download (struct GNUNET_FS_DownloadContext *dc)
{
- struct Node *pos;
-
- if (rm->abortFlag == GNUNET_NO)
- rm->abortFlag = GNUNET_YES;
- if (rm->my_sctx == GNUNET_YES)
- GNUNET_FS_destroy_search_context (rm->sctx);
+ size_t size;
+ uint64_t size64;
+ void *data;
+ struct GNUNET_DISK_FileHandle *h;
+ struct GNUNET_DISK_MapHandle *m;
+
+ size64 = GNUNET_FS_uri_chk_get_file_size (dc->uri);
+ size = (size_t) size64;
+ if (size64 != (uint64_t) size)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Recursive downloads of directories larger than 4 GB are not supported on 32-bit systems\n"));
+ return;
+ }
+ if (dc->filename != NULL)
+ {
+ h = GNUNET_DISK_file_open (dc->filename,
+ GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
+ }
else
- GNUNET_FS_suspend_search_context (rm->sctx);
- while (rm->head != NULL)
- {
- pos = rm->head;
- GNUNET_DLL_remove (rm->head, rm->tail, pos);
- if (rm->my_sctx != GNUNET_YES)
- GNUNET_FS_stop_search (rm->sctx, &content_receive_callback, pos);
- GNUNET_free (pos);
- }
- if (rm->my_sctx != GNUNET_YES)
- GNUNET_FS_resume_search_context (rm->sctx);
- GNUNET_GE_ASSERT (NULL, rm->tail == NULL);
- if (rm->handle >= 0)
- CLOSE (rm->handle);
- if (rm->main != NULL)
- GNUNET_thread_release_self (rm->main);
- GNUNET_free_non_null (rm->filename);
- rm->sctx = NULL;
- GNUNET_free (rm);
+ {
+ GNUNET_assert (dc->temp_filename != NULL);
+ h = GNUNET_DISK_file_open (dc->temp_filename,
+ GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
+ }
+ if (h == NULL)
+ return; /* oops */
+ data = GNUNET_DISK_file_map (h, &m, GNUNET_DISK_MAP_TYPE_READ, size);
+ if (data == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Directory too large for system address space\n"));
+ }
+ else
+ {
+ GNUNET_FS_directory_list_contents (size,
+ data,
+ 0,
+ &trigger_recursive_download,
+ dc);
+ GNUNET_DISK_file_unmap (m);
+ }
+ GNUNET_DISK_file_close (h);
+ if (dc->filename == NULL)
+ {
+ if (0 != UNLINK (dc->temp_filename))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
+ "unlink",
+ dc->temp_filename);
+ GNUNET_free (dc->temp_filename);
+ dc->temp_filename = NULL;
+ }
}
+
/**
- * Read method.
+ * Check if all child-downloads have completed and
+ * if so, signal completion (and possibly recurse to
+ * parent).
+ */
+static void
+check_completed (struct GNUNET_FS_DownloadContext *dc)
+{
+ struct GNUNET_FS_ProgressInfo pi;
+ struct GNUNET_FS_DownloadContext *pos;
+
+ pos = dc->child_head;
+ while (pos != NULL)
+ {
+ if ( (pos->emsg == NULL) &&
+ (pos->completed < pos->length) )
+ return; /* not done yet */
+ if ( (pos->child_head != NULL) &&
+ (pos->has_finished != GNUNET_YES) )
+ return; /* not transitively done yet */
+ pos = pos->next;
+ }
+ dc->has_finished = GNUNET_YES;
+ GNUNET_FS_download_sync_ (dc);
+ /* signal completion */
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ if (dc->parent != NULL)
+ check_completed (dc->parent);
+}
+
+
+/**
+ * We found an entry in a directory. Check if the respective child
+ * already exists and if not create the respective child download.
*
- * @param self reference to the download context
- * @param level level in the tree to read/write at
- * @param pos position where to read or write
- * @param buf where to read from or write to
- * @param len how many bytes to read or write
- * @return number of bytes read, GNUNET_SYSERR on error
+ * @param cls the parent download
+ * @param filename name of the file in the directory
+ * @param uri URI of the file (CHK or LOC)
+ * @param meta meta data of the file
+ * @param length number of bytes in data
+ * @param data contents of the file (or NULL if they were not inlined)
*/
-static int
-read_from_files (struct GNUNET_ECRS_DownloadContext *self,
- unsigned int level,
- unsigned long long pos, void *buf, unsigned int len)
+static void
+trigger_recursive_download (void *cls,
+ const char *filename,
+ const struct GNUNET_FS_Uri *uri,
+ const struct GNUNET_CONTAINER_MetaData *meta,
+ size_t length,
+ const void *data)
{
- if ((level > 0) || (self->handle == -1))
- return GNUNET_SYSERR;
- LSEEK (self->handle, pos, SEEK_SET);
- return READ (self->handle, buf, len);
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ struct GNUNET_FS_DownloadContext *cpos;
+ struct GNUNET_DISK_FileHandle *fh;
+ char *temp_name;
+ const char *real_name;
+ char *fn;
+ char *us;
+ char *ext;
+ char *dn;
+ char *pos;
+ char *full_name;
+
+ if (NULL == uri)
+ return; /* entry for the directory itself */
+ cpos = dc->child_head;
+ while (cpos != NULL)
+ {
+ if ( (GNUNET_FS_uri_test_equal (uri,
+ cpos->uri)) ||
+ ( (filename != NULL) &&
+ (0 == strcmp (cpos->filename,
+ filename)) ) )
+ break;
+ cpos = cpos->next;
+ }
+ if (cpos != NULL)
+ return; /* already exists */
+ fn = NULL;
+ if (NULL == filename)
+ {
+ fn = GNUNET_FS_meta_data_suggest_filename (meta);
+ if (fn == NULL)
+ {
+ us = GNUNET_FS_uri_to_string (uri);
+ fn = GNUNET_strdup (&us [strlen (GNUNET_FS_URI_PREFIX
+ GNUNET_FS_URI_CHK_INFIX)]);
+ GNUNET_free (us);
+ }
+ else if (fn[0] == '.')
+ {
+ ext = fn;
+ us = GNUNET_FS_uri_to_string (uri);
+ GNUNET_asprintf (&fn,
+ "%s%s",
+ &us[strlen (GNUNET_FS_URI_PREFIX
+ GNUNET_FS_URI_CHK_INFIX)], ext);
+ GNUNET_free (ext);
+ GNUNET_free (us);
+ }
+ /* change '\' to '/' (this should have happened
+ during insertion, but malicious peers may
+ not have done this) */
+ while (NULL != (pos = strstr (fn, "\\")))
+ *pos = '/';
+ /* remove '../' everywhere (again, well-behaved
+ peers don't do this, but don't trust that
+ we did not get something nasty) */
+ while (NULL != (pos = strstr (fn, "../")))
+ {
+ pos[0] = '_';
+ pos[1] = '_';
+ pos[2] = '_';
+ }
+ filename = fn;
+ }
+ if (dc->filename == NULL)
+ {
+ full_name = NULL;
+ }
+ else
+ {
+ dn = GNUNET_strdup (dc->filename);
+ GNUNET_break ( (strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
+ (NULL !=
+ strstr (dn + strlen(dn) - strlen(GNUNET_FS_DIRECTORY_EXT),
+ GNUNET_FS_DIRECTORY_EXT)) );
+ if ( (strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
+ (NULL !=
+ strstr (dn + strlen(dn) - strlen(GNUNET_FS_DIRECTORY_EXT),
+ GNUNET_FS_DIRECTORY_EXT)) )
+ dn[strlen(dn) - strlen (GNUNET_FS_DIRECTORY_EXT)] = '\0';
+ if ( (GNUNET_YES == GNUNET_FS_meta_data_test_for_directory (meta)) &&
+ ( (strlen (filename) < strlen (GNUNET_FS_DIRECTORY_EXT)) ||
+ (NULL ==
+ strstr (filename + strlen(filename) - strlen(GNUNET_FS_DIRECTORY_EXT),
+ GNUNET_FS_DIRECTORY_EXT)) ) )
+ {
+ GNUNET_asprintf (&full_name,
+ "%s%s%s%s",
+ dn,
+ DIR_SEPARATOR_STR,
+ filename,
+ GNUNET_FS_DIRECTORY_EXT);
+ }
+ else
+ {
+ GNUNET_asprintf (&full_name,
+ "%s%s%s",
+ dn,
+ DIR_SEPARATOR_STR,
+ filename);
+ }
+ GNUNET_free (dn);
+ }
+ if ( (full_name != NULL) &&
+ (GNUNET_OK !=
+ GNUNET_DISK_directory_create_for_file (full_name)) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to create directory for recursive download of `%s'\n"),
+ full_name);
+ GNUNET_free (full_name);
+ GNUNET_free_non_null (fn);
+ return;
+ }
+
+ temp_name = NULL;
+ if ( (data != NULL) &&
+ (GNUNET_FS_uri_chk_get_file_size (uri) == length) )
+ {
+ if (full_name == NULL)
+ {
+ temp_name = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
+ real_name = temp_name;
+ }
+ else
+ {
+ real_name = full_name;
+ }
+ /* write to disk, then trigger normal download which will instantly progress to completion */
+ fh = GNUNET_DISK_file_open (real_name,
+ GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_TRUNCATE | GNUNET_DISK_OPEN_CREATE,
+ GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
+ if (fh == NULL)
+ {
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+ "open",
+ real_name);
+ GNUNET_free (full_name);
+ GNUNET_free_non_null (fn);
+ return;
+ }
+ if (length !=
+ GNUNET_DISK_file_write (fh,
+ data,
+ length))
+ {
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+ "write",
+ full_name);
+ }
+ GNUNET_DISK_file_close (fh);
+ }
+ GNUNET_FS_download_start (dc->h,
+ uri,
+ meta,
+ full_name, temp_name,
+ 0,
+ GNUNET_FS_uri_chk_get_file_size (uri),
+ dc->anonymity,
+ dc->options,
+ NULL,
+ dc);
+ GNUNET_free_non_null (full_name);
+ GNUNET_free_non_null (temp_name);
+ GNUNET_free_non_null (fn);
}
+
/**
- * Write method.
+ * Free entries in the map.
*
- * @param self reference to the download context
- * @param level level in the tree to write to
- * @param pos position where to write
- * @param buf where to write to
- * @param len how many bytes to write
- * @return number of bytes written, GNUNET_SYSERR on error
+ * @param cls unused (NULL)
+ * @param key unused
+ * @param entry entry of type "struct DownloadRequest" which is freed
+ * @return GNUNET_OK
*/
static int
-write_to_files (struct GNUNET_ECRS_DownloadContext *self,
- unsigned int level,
- unsigned long long pos, void *buf, unsigned int len)
+free_entry (void *cls,
+ const GNUNET_HashCode *key,
+ void *entry)
{
- int ret;
-
- if (level > 0)
- return len; /* lie -- no more temps */
- if (self->handle == -1)
- return len;
- LSEEK (self->handle, pos, SEEK_SET);
- ret = WRITE (self->handle, buf, len);
- if (ret != len)
- GNUNET_GE_LOG_STRERROR_FILE (self->ectx,
- GNUNET_GE_ERROR | GNUNET_GE_BULK |
- GNUNET_GE_USER, "write", self->filename);
- return ret;
+ GNUNET_free (entry);
+ return GNUNET_OK;
}
+
/**
- * Queue a request for execution.
+ * Iterator over entries in the pending requests in the 'active' map for the
+ * reply that we just got.
*
- * @param rm the request manager struct from createRequestManager
- * @param node the node to call once a reply is received
+ * @param cls closure (our 'struct ProcessResultClosure')
+ * @param key query for the given value / request
+ * @param value value in the hash map (a 'struct DownloadRequest')
+ * @return GNUNET_YES (we should continue to iterate); unless serious error
*/
-static void
-add_request (struct Node *node)
+static int
+process_result_with_request (void *cls,
+ const GNUNET_HashCode * key,
+ void *value)
{
- struct GNUNET_ECRS_DownloadContext *rm = node->ctx;
-
- GNUNET_DLL_insert (rm->head, rm->tail, node);
- GNUNET_FS_start_search (rm->sctx,
- rm->have_target == GNUNET_NO ? NULL : &rm->target,
- GNUNET_ECRS_BLOCKTYPE_DATA, 1,
- &node->chk.query,
- rm->anonymityLevel,
- &content_receive_callback, node);
+ struct ProcessResultClosure *prc = cls;
+ struct DownloadRequest *sm = value;
+ struct DownloadRequest *ppos;
+ struct DownloadRequest *pprev;
+ struct GNUNET_DISK_FileHandle *fh;
+ struct GNUNET_FS_DownloadContext *dc = prc->dc;
+ struct GNUNET_CRYPTO_AesSessionKey skey;
+ struct GNUNET_CRYPTO_AesInitializationVector iv;
+ char pt[prc->size];
+ struct GNUNET_FS_ProgressInfo pi;
+ uint64_t off;
+ size_t bs;
+ size_t app;
+ int i;
+ struct ContentHashKey *chk;
+
+ fh = NULL;
+ bs = GNUNET_FS_tree_calculate_block_size (GNUNET_ntohll (dc->uri->data.chk.file_length),
+ dc->treedepth,
+ sm->offset,
+ sm->depth);
+ if (prc->size != bs)
+ {
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Internal error or bogus download URI (expected %u bytes, got %u)\n",
+ bs,
+ prc->size);
+#endif
+ dc->emsg = GNUNET_strdup ("Internal error or bogus download URI");
+ goto signal_error;
+ }
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (dc->active,
+ &prc->query,
+ sm));
+ /* if this request is on the pending list, remove it! */
+ pprev = NULL;
+ ppos = dc->pending;
+ while (ppos != NULL)
+ {
+ if (ppos == sm)
+ {
+ if (pprev == NULL)
+ dc->pending = ppos->next;
+ else
+ pprev->next = ppos->next;
+ break;
+ }
+ pprev = ppos;
+ ppos = ppos->next;
+ }
+ GNUNET_CRYPTO_hash_to_aes_key (&sm->chk.key, &skey, &iv);
+ if (-1 == GNUNET_CRYPTO_aes_decrypt (prc->data,
+ prc->size,
+ &skey,
+ &iv,
+ pt))
+ {
+ GNUNET_break (0);
+ dc->emsg = GNUNET_strdup ("internal error decrypting content");
+ goto signal_error;
+ }
+ off = compute_disk_offset (GNUNET_ntohll (dc->uri->data.chk.file_length),
+ sm->offset,
+ sm->depth,
+ dc->treedepth);
+ /* save to disk */
+ if ( ( GNUNET_YES == prc->do_store) &&
+ ( (dc->filename != NULL) ||
+ (is_recursive_download (dc)) ) &&
+ ( (sm->depth == dc->treedepth) ||
+ (0 == (dc->options & GNUNET_FS_DOWNLOAD_NO_TEMPORARIES)) ) )
+ {
+ fh = GNUNET_DISK_file_open (dc->filename != NULL
+ ? dc->filename
+ : dc->temp_filename,
+ GNUNET_DISK_OPEN_READWRITE |
+ GNUNET_DISK_OPEN_CREATE,
+ GNUNET_DISK_PERM_USER_READ |
+ GNUNET_DISK_PERM_USER_WRITE |
+ GNUNET_DISK_PERM_GROUP_READ |
+ GNUNET_DISK_PERM_OTHER_READ);
+ }
+ if ( (NULL == fh) &&
+ (GNUNET_YES == prc->do_store) &&
+ ( (dc->filename != NULL) ||
+ (is_recursive_download (dc)) ) &&
+ ( (sm->depth == dc->treedepth) ||
+ (0 == (dc->options & GNUNET_FS_DOWNLOAD_NO_TEMPORARIES)) ) )
+ {
+ GNUNET_asprintf (&dc->emsg,
+ _("Download failed: could not open file `%s': %s\n"),
+ dc->filename,
+ STRERROR (errno));
+ goto signal_error;
+ }
+ if (fh != NULL)
+ {
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Saving decrypted block to disk at offset %llu\n",
+ (unsigned long long) off);
+#endif
+ if ( (off !=
+ GNUNET_DISK_file_seek (fh,
+ off,
+ GNUNET_DISK_SEEK_SET) ) )
+ {
+ GNUNET_asprintf (&dc->emsg,
+ _("Failed to seek to offset %llu in file `%s': %s\n"),
+ (unsigned long long) off,
+ dc->filename,
+ STRERROR (errno));
+ goto signal_error;
+ }
+ if (prc->size !=
+ GNUNET_DISK_file_write (fh,
+ pt,
+ prc->size))
+ {
+ GNUNET_asprintf (&dc->emsg,
+ _("Failed to write block of %u bytes at offset %llu in file `%s': %s\n"),
+ (unsigned int) prc->size,
+ (unsigned long long) off,
+ dc->filename,
+ STRERROR (errno));
+ goto signal_error;
+ }
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
+ fh = NULL;
+ }
+ if (sm->depth == dc->treedepth)
+ {
+ app = prc->size;
+ if (sm->offset < dc->offset)
+ {
+ /* starting offset begins in the middle of pt,
+ do not count first bytes as progress */
+ GNUNET_assert (app > (dc->offset - sm->offset));
+ app -= (dc->offset - sm->offset);
+ }
+ if (sm->offset + prc->size > dc->offset + dc->length)
+ {
+ /* end of block is after relevant range,
+ do not count last bytes as progress */
+ GNUNET_assert (app > (sm->offset + prc->size) - (dc->offset + dc->length));
+ app -= (sm->offset + prc->size) - (dc->offset + dc->length);
+ }
+ dc->completed += app;
+
+ /* do recursive download if option is set and either meta data
+ says it is a directory or if no meta data is given AND filename
+ ends in '.gnd' (top-level case) */
+ if (is_recursive_download (dc))
+ GNUNET_FS_directory_list_contents (prc->size,
+ pt,
+ off,
+ &trigger_recursive_download,
+ dc);
+
+ }
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_PROGRESS;
+ pi.value.download.specifics.progress.data = pt;
+ pi.value.download.specifics.progress.offset = sm->offset;
+ pi.value.download.specifics.progress.data_len = prc->size;
+ pi.value.download.specifics.progress.depth = sm->depth;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ GNUNET_assert (dc->completed <= dc->length);
+ if (dc->completed == dc->length)
+ {
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Download completed, truncating file to desired length %llu\n",
+ (unsigned long long) GNUNET_ntohll (dc->uri->data.chk.file_length));
+#endif
+ /* truncate file to size (since we store IBlocks at the end) */
+ if (dc->filename != NULL)
+ {
+ if (0 != truncate (dc->filename,
+ GNUNET_ntohll (dc->uri->data.chk.file_length)))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
+ "truncate",
+ dc->filename);
+ }
+ if (dc->job_queue != NULL)
+ {
+ GNUNET_FS_dequeue_ (dc->job_queue);
+ dc->job_queue = NULL;
+ }
+ if (is_recursive_download (dc))
+ full_recursive_download (dc);
+ if (dc->child_head == NULL)
+ {
+ /* signal completion */
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ if (dc->parent != NULL)
+ check_completed (dc->parent);
+ }
+ GNUNET_assert (sm->depth == dc->treedepth);
+ }
+ if (sm->depth == dc->treedepth)
+ {
+ GNUNET_FS_download_sync_ (dc);
+ GNUNET_free (sm);
+ return GNUNET_YES;
+ }
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Triggering downloads of children (this block was at depth %u and offset %llu)\n",
+ sm->depth,
+ (unsigned long long) sm->offset);
+#endif
+ GNUNET_assert (0 == (prc->size % sizeof(struct ContentHashKey)));
+ chk = (struct ContentHashKey*) pt;
+ for (i=(prc->size / sizeof(struct ContentHashKey))-1;i>=0;i--)
+ {
+ off = compute_dblock_offset (sm->offset,
+ sm->depth,
+ dc->treedepth,
+ i);
+ if ( (off + DBLOCK_SIZE >= dc->offset) &&
+ (off < dc->offset + dc->length) )
+ schedule_block_download (dc,
+ &chk[i],
+ off,
+ sm->depth + 1);
+ }
+ GNUNET_free (sm);
+ GNUNET_FS_download_sync_ (dc);
+ return GNUNET_YES;
+
+ signal_error:
+ if (fh != NULL)
+ GNUNET_DISK_file_close (fh);
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
+ pi.value.download.specifics.error.message = dc->emsg;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ /* abort all pending requests */
+ if (NULL != dc->th)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
+ dc->th = NULL;
+ }
+ GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
+ GNUNET_CONTAINER_multihashmap_iterate (dc->active,
+ &free_entry,
+ NULL);
+ dc->pending = NULL;
+ dc->client = NULL;
+ GNUNET_free (sm);
+ GNUNET_FS_download_sync_ (dc);
+ return GNUNET_NO;
}
+
+/**
+ * Process a download result.
+ *
+ * @param dc our download context
+ * @param type type of the result
+ * @param data the (encrypted) response
+ * @param size size of data
+ */
static void
-signal_abort (struct GNUNET_ECRS_DownloadContext *rm, const char *msg)
+process_result (struct GNUNET_FS_DownloadContext *dc,
+ enum GNUNET_BLOCK_Type type,
+ const void *data,
+ size_t size)
{
- rm->abortFlag = GNUNET_SYSERR;
- if ((rm->head != NULL) && (rm->dpcb != NULL))
- rm->dpcb (rm->length + 1, 0, 0, 0, msg, 0, rm->dpcbClosure);
- GNUNET_thread_stop_sleep (rm->main);
+ struct ProcessResultClosure prc;
+
+ prc.dc = dc;
+ prc.data = data;
+ prc.size = size;
+ prc.type = type;
+ prc.do_store = GNUNET_YES;
+ GNUNET_CRYPTO_hash (data, size, &prc.query);
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received result for query `%s' from `%s'-service\n",
+ GNUNET_h2s (&prc.query),
+ "FS");
+#endif
+ GNUNET_CONTAINER_multihashmap_get_multiple (dc->active,
+ &prc.query,
+ &process_result_with_request,
+ &prc);
}
+
/**
- * Dequeue a request.
+ * Type of a function to call when we receive a message
+ * from the service.
*
- * @param self the request manager struct from createRequestManager
- * @param node the block for which the request is canceled
+ * @param cls closure
+ * @param msg message received, NULL on timeout or fatal error
*/
-static void
-delete_node (struct Node *node)
+static void
+receive_results (void *cls,
+ const struct GNUNET_MessageHeader * msg)
{
- struct GNUNET_ECRS_DownloadContext *rm = node->ctx;
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ const struct PutMessage *cm;
+ uint16_t msize;
- GNUNET_DLL_remove (rm->head, rm->tail, node);
- GNUNET_free (node);
- if (rm->head == NULL)
- GNUNET_thread_stop_sleep (rm->main);
+ if ( (NULL == msg) ||
+ (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_PUT) ||
+ (sizeof (struct PutMessage) > ntohs(msg->size)) )
+ {
+ GNUNET_break (msg == NULL);
+ try_reconnect (dc);
+ return;
+ }
+ msize = ntohs(msg->size);
+ cm = (const struct PutMessage*) msg;
+ process_result (dc,
+ ntohl (cm->type),
+ &cm[1],
+ msize - sizeof (struct PutMessage));
+ if (dc->client == NULL)
+ return; /* fatal error */
+ /* continue receiving */
+ GNUNET_CLIENT_receive (dc->client,
+ &receive_results,
+ dc,
+ GNUNET_TIME_UNIT_FOREVER_REL);
}
+
+
/**
- * Compute how many bytes of data are stored in
- * this node.
+ * We're ready to transmit a search request to the
+ * file-sharing service. Do it. If there is
+ * more than one request pending, try to send
+ * multiple or request another transmission.
+ *
+ * @param cls closure
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
*/
-static unsigned int
-get_node_size (const struct Node *node)
+static size_t
+transmit_download_request (void *cls,
+ size_t size,
+ void *buf)
{
- unsigned int i;
- unsigned int ret;
- unsigned long long rsize;
- unsigned long long spos;
- unsigned long long epos;
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ size_t msize;
+ struct SearchMessage *sm;
- GNUNET_GE_ASSERT (node->ctx->ectx, node->offset < node->ctx->total);
- if (node->level == 0)
+ dc->th = NULL;
+ if (NULL == buf)
{
- ret = GNUNET_ECRS_DBLOCK_SIZE;
- if (node->offset + (unsigned long long) ret > node->ctx->total)
- ret = (unsigned int) (node->ctx->total - node->offset);
#if DEBUG_DOWNLOAD
- GNUNET_GE_LOG (node->ctx->rm->ectx,
- GNUNET_GE_DEBUG | GNUNET_GE_REQUEST | GNUNET_GE_USER,
- "Node at offset %llu and level %d has size %u\n",
- node->offset, node->level, ret);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting download request failed, trying to reconnect\n");
#endif
- return ret;
- }
- rsize = GNUNET_ECRS_DBLOCK_SIZE;
- for (i = 0; i < node->level - 1; i++)
- rsize *= GNUNET_ECRS_CHK_PER_INODE;
- spos = rsize * (node->offset / sizeof (GNUNET_EC_ContentHashKey));
- epos = spos + rsize * GNUNET_ECRS_CHK_PER_INODE;
- if (epos > node->ctx->total)
- epos = node->ctx->total;
- ret = (epos - spos) / rsize;
- if (ret * rsize < epos - spos)
- ret++; /* need to round up! */
+ try_reconnect (dc);
+ return 0;
+ }
+ GNUNET_assert (size >= sizeof (struct SearchMessage));
+ msize = 0;
+ sm = buf;
+ while ( (dc->pending != NULL) &&
+ (size >= msize + sizeof (struct SearchMessage)) )
+ {
#if DEBUG_DOWNLOAD
- GNUNET_GE_LOG (node->ctx->rm->ectx,
- GNUNET_GE_DEBUG | GNUNET_GE_REQUEST | GNUNET_GE_USER,
- "Node at offset %llu and level %d has size %u\n",
- node->offset, node->level,
- ret * sizeof (GNUNET_EC_ContentHashKey));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting download request for `%s' to `%s'-service\n",
+ GNUNET_h2s (&dc->pending->chk.query),
+ "FS");
#endif
- return ret * sizeof (GNUNET_EC_ContentHashKey);
+ memset (sm, 0, sizeof (struct SearchMessage));
+ sm->header.size = htons (sizeof (struct SearchMessage));
+ sm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_START_SEARCH);
+ if (0 != (dc->options & GNUNET_FS_DOWNLOAD_OPTION_LOOPBACK_ONLY))
+ sm->options = htonl (1);
+ else
+ sm->options = htonl (0);
+ if (dc->pending->depth == dc->treedepth)
+ sm->type = htonl (GNUNET_BLOCK_TYPE_DBLOCK);
+ else
+ sm->type = htonl (GNUNET_BLOCK_TYPE_IBLOCK);
+ sm->anonymity_level = htonl (dc->anonymity);
+ sm->target = dc->target.hashPubKey;
+ sm->query = dc->pending->chk.query;
+ dc->pending->is_pending = GNUNET_NO;
+ dc->pending = dc->pending->next;
+ msize += sizeof (struct SearchMessage);
+ sm++;
+ }
+ if (dc->pending != NULL)
+ dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
+ sizeof (struct SearchMessage),
+ GNUNET_CONSTANTS_SERVICE_TIMEOUT,
+ GNUNET_NO,
+ &transmit_download_request,
+ dc);
+ return msize;
}
+
/**
- * Notify client about progress.
+ * Reconnect to the FS service and transmit our queries NOW.
+ *
+ * @param cls our download context
+ * @param tc unused
*/
static void
-notify_client_about_progress (const struct Node *node,
- const char *data, unsigned int size)
+do_reconnect (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct GNUNET_ECRS_DownloadContext *rm = node->ctx;
- GNUNET_CronTime eta;
-
- if ((rm->abortFlag != GNUNET_NO) || (node->level != 0))
- return;
- rm->completed += size;
- eta = GNUNET_get_time ();
- if (rm->completed > 0)
- eta = (GNUNET_CronTime) (rm->startTime +
- (((double) (eta - rm->startTime) /
- (double) rm->completed)) *
- (double) rm->length);
- if (rm->dpcb != NULL)
- rm->dpcb (rm->length,
- rm->completed, eta, node->offset, data, size, rm->dpcbClosure);
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ struct GNUNET_CLIENT_Connection *client;
+
+ dc->task = GNUNET_SCHEDULER_NO_TASK;
+ client = GNUNET_CLIENT_connect (dc->h->sched,
+ "fs",
+ dc->h->cfg);
+ if (NULL == client)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Connecting to `%s'-service failed, will try again.\n",
+ "FS");
+ try_reconnect (dc);
+ return;
+ }
+ dc->client = client;
+ dc->th = GNUNET_CLIENT_notify_transmit_ready (client,
+ sizeof (struct SearchMessage),
+ GNUNET_CONSTANTS_SERVICE_TIMEOUT,
+ GNUNET_NO,
+ &transmit_download_request,
+ dc);
+ GNUNET_CLIENT_receive (client,
+ &receive_results,
+ dc,
+ GNUNET_TIME_UNIT_FOREVER_REL);
}
/**
- * DOWNLOAD children of this GNUNET_EC_IBlock.
- *
- * @param node the node for which the children should be downloaded
- * @param data data for the node
- * @param size size of data
- */
-static void iblock_download_children (const struct Node *node,
- const char *data, unsigned int size);
-
-/**
- * Check if self block is already present on the drive. If the block
- * is a dblock and present, the ProgressModel is notified. If the
- * block is present and it is an iblock, downloading the children is
- * triggered.
- *
- * Also checks if the block is within the range of blocks
- * that we are supposed to download. If not, the method
- * returns as if the block is present but does NOT signal
- * progress.
+ * Add entries that are not yet pending back to the pending list.
*
- * @param node that is checked for presence
- * @return GNUNET_YES if present, GNUNET_NO if not.
+ * @param cls our download context
+ * @param key unused
+ * @param entry entry of type "struct DownloadRequest"
+ * @return GNUNET_OK
*/
static int
-check_node_present (const struct Node *node)
+retry_entry (void *cls,
+ const GNUNET_HashCode *key,
+ void *entry)
{
- int res;
- int ret;
- char *data;
- unsigned int size;
- GNUNET_HashCode hc;
-
- size = get_node_size (node);
- /* first check if node is within range.
- For now, keeping it simple, we only do
- this for level-0 nodes */
- if ((node->level == 0) &&
- ((node->offset + size < node->ctx->offset) ||
- (node->offset >= node->ctx->offset + node->ctx->length)))
- return GNUNET_YES;
- data = GNUNET_malloc (size);
- ret = GNUNET_NO;
- res = read_from_files (node->ctx, node->level, node->offset, data, size);
- if (res == size)
- {
- GNUNET_hash (data, size, &hc);
- if (0 == memcmp (&hc, &node->chk.key, sizeof (GNUNET_HashCode)))
- {
- notify_client_about_progress (node, data, size);
- if (node->level > 0)
- iblock_download_children (node, data, size);
- ret = GNUNET_YES;
- }
- }
- GNUNET_free (data);
- return ret;
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ struct DownloadRequest *dr = entry;
+
+ if (! dr->is_pending)
+ {
+ dr->next = dc->pending;
+ dr->is_pending = GNUNET_YES;
+ dc->pending = entry;
+ }
+ return GNUNET_OK;
}
+
/**
- * DOWNLOAD children of this GNUNET_EC_IBlock.
+ * We've lost our connection with the FS service.
+ * Re-establish it and re-transmit all of our
+ * pending requests.
*
- * @param node the node that should be downloaded
+ * @param dc download context that is having trouble
*/
static void
-iblock_download_children (const struct Node *node,
- const char *data, unsigned int size)
+try_reconnect (struct GNUNET_FS_DownloadContext *dc)
{
- struct GNUNET_GE_Context *ectx = node->ctx->ectx;
- int i;
- struct Node *child;
- unsigned int childcount;
- const GNUNET_EC_ContentHashKey *chks;
- unsigned int levelSize;
- unsigned long long baseOffset;
-
- GNUNET_GE_ASSERT (ectx, node->level > 0);
- childcount = size / sizeof (GNUNET_EC_ContentHashKey);
- if (size != childcount * sizeof (GNUNET_EC_ContentHashKey))
- {
- GNUNET_GE_BREAK (ectx, 0);
- return;
- }
- if (node->level == 1)
- {
- levelSize = GNUNET_ECRS_DBLOCK_SIZE;
- baseOffset =
- node->offset / sizeof (GNUNET_EC_ContentHashKey) *
- GNUNET_ECRS_DBLOCK_SIZE;
- }
- else
+
+ if (NULL != dc->client)
{
- levelSize =
- sizeof (GNUNET_EC_ContentHashKey) * GNUNET_ECRS_CHK_PER_INODE;
- baseOffset = node->offset * GNUNET_ECRS_CHK_PER_INODE;
- }
- chks = (const GNUNET_EC_ContentHashKey *) data;
- for (i = 0; i < childcount; i++)
- {
- child = GNUNET_malloc (sizeof (struct Node));
- child->ctx = node->ctx;
- child->chk = chks[i];
- child->offset = baseOffset + i * levelSize;
- GNUNET_GE_ASSERT (ectx, child->offset < node->ctx->total);
- child->level = node->level - 1;
- GNUNET_GE_ASSERT (ectx, (child->level != 0) ||
- ((child->offset % GNUNET_ECRS_DBLOCK_SIZE) == 0));
- if (GNUNET_NO == check_node_present (child))
- add_request (child);
- else
- GNUNET_free (child); /* done already! */
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Moving all requests back to pending list\n");
+#endif
+ if (NULL != dc->th)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
+ dc->th = NULL;
+ }
+ GNUNET_CONTAINER_multihashmap_iterate (dc->active,
+ &retry_entry,
+ dc);
+ GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
+ dc->client = NULL;
}
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Will try to reconnect in 1s\n");
+#endif
+ dc->task
+ = GNUNET_SCHEDULER_add_delayed (dc->h->sched,
+ GNUNET_TIME_UNIT_SECONDS,
+ &do_reconnect,
+ dc);
}
+
/**
- * Decrypts a given data block
+ * We're allowed to ask the FS service for our blocks. Start the download.
*
- * @param data represents the data block
- * @param hashcode represents the key concatenated with the initial
- * value used in the alg
- * @param result where to store the result (encrypted block)
- * @returns GNUNET_OK on success, GNUNET_SYSERR on error
+ * @param cls the 'struct GNUNET_FS_DownloadContext'
+ * @param client handle to use for communcation with FS (we must destroy it!)
*/
-static int
-decrypt_content (const char *data,
- unsigned int size, const GNUNET_HashCode * hashcode,
- char *result)
+static void
+activate_fs_download (void *cls,
+ struct GNUNET_CLIENT_Connection *client)
{
- GNUNET_AES_InitializationVector iv;
- GNUNET_AES_SessionKey skey;
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ struct GNUNET_FS_ProgressInfo pi;
- /* get key and init value from the GNUNET_HashCode */
- GNUNET_hash_to_AES_key (hashcode, &skey, &iv);
- return GNUNET_AES_decrypt (&skey, data, size, &iv, result);
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Download activated\n");
+#endif
+ GNUNET_assert (NULL != client);
+ GNUNET_assert (dc->client == NULL);
+ GNUNET_assert (dc->th == NULL);
+ dc->client = client;
+ GNUNET_CLIENT_receive (client,
+ &receive_results,
+ dc,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_ACTIVE;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ GNUNET_CONTAINER_multihashmap_iterate (dc->active,
+ &retry_entry,
+ dc);
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking for transmission to FS service\n");
+#endif
+ dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
+ sizeof (struct SearchMessage),
+ GNUNET_CONSTANTS_SERVICE_TIMEOUT,
+ GNUNET_NO,
+ &transmit_download_request,
+ dc);
+ GNUNET_assert (dc->th != NULL);
}
+
/**
- * We received a GNUNET_EC_ContentHashKey reply for a block. Decrypt. Note
- * that the caller (fslib) has already aquired the
- * RM lock (we sometimes aquire it again in callees,
- * mostly because our callees could be also be theoretically
- * called from elsewhere).
+ * We must stop to ask the FS service for our blocks. Pause the download.
*
- * @param cls the node for which the reply is given, freed in
- * the function!
- * @param query the query for which reply is the answer
- * @param reply the reply
- * @return GNUNET_OK if the reply was valid, GNUNET_SYSERR on error
+ * @param cls the 'struct GNUNET_FS_DownloadContext'
*/
-static int
-content_receive_callback (const GNUNET_HashCode * query,
- const GNUNET_DatastoreValue * reply, void *cls,
- unsigned long long uid)
+static void
+deactivate_fs_download (void *cls)
{
- struct Node *node = cls;
- struct GNUNET_ECRS_DownloadContext *rm = node->ctx;
- struct GNUNET_GE_Context *ectx = rm->ectx;
- GNUNET_HashCode hc;
- unsigned int size;
- char *data;
-
- if (rm->abortFlag != GNUNET_NO)
- return GNUNET_SYSERR;
- GNUNET_GE_ASSERT (ectx,
- 0 == memcmp (query, &node->chk.query,
- sizeof (GNUNET_HashCode)));
- size = ntohl (reply->size) - sizeof (GNUNET_DatastoreValue);
- if ((size <= sizeof (GNUNET_EC_DBlock)) ||
- (size - sizeof (GNUNET_EC_DBlock) != get_node_size (node)))
- {
- GNUNET_GE_BREAK (ectx, 0);
- return GNUNET_SYSERR; /* invalid size! */
- }
- size -= sizeof (GNUNET_EC_DBlock);
- data = GNUNET_malloc (size);
- if (GNUNET_SYSERR ==
- decrypt_content ((const char *)
- &((const GNUNET_EC_DBlock *) &reply[1])[1], size,
- &node->chk.key, data))
- GNUNET_GE_ASSERT (ectx, 0);
- GNUNET_hash (data, size, &hc);
- if (0 != memcmp (&hc, &node->chk.key, sizeof (GNUNET_HashCode)))
- {
- GNUNET_free (data);
- GNUNET_GE_BREAK (ectx, 0);
- signal_abort (rm,
- _("Decrypted content does not match key. "
- "This is either a bug or a maliciously inserted "
- "file. Download aborted.\n"));
- return GNUNET_SYSERR;
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ struct GNUNET_FS_ProgressInfo pi;
+
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Download deactivated\n");
+#endif
+ if (NULL != dc->th)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
+ dc->th = NULL;
}
- if (size != write_to_files (rm, node->level, node->offset, data, size))
+ if (NULL != dc->client)
{
- GNUNET_GE_LOG_STRERROR (ectx,
- GNUNET_GE_ERROR | GNUNET_GE_ADMIN |
- GNUNET_GE_USER | GNUNET_GE_BULK, "WRITE");
- signal_abort (rm, _("IO error."));
- return GNUNET_SYSERR;
+ GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
+ dc->client = NULL;
}
- notify_client_about_progress (node, data, size);
- if (node->level > 0)
- iblock_download_children (node, data, size);
- GNUNET_free (data);
- /* request satisfied, stop requesting! */
- delete_node (node);
- return GNUNET_OK;
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_INACTIVE;
+ GNUNET_FS_download_make_status_ (&pi, dc);
}
/**
- * Helper function to sanitize filename
- * and create necessary directories.
+ * Create SUSPEND event for the given download operation
+ * and then clean up our state (without stop signal).
+ *
+ * @param cls the 'struct GNUNET_FS_DownloadContext' to signal for
*/
-static char *
-get_real_download_filename (struct GNUNET_GE_Context *ectx,
- const char *filename)
+void
+GNUNET_FS_download_signal_suspend_ (void *cls)
{
- struct stat buf;
- char *realFN;
- char *path;
- char *pos;
-
- if ((filename[strlen (filename) - 1] == '/') ||
- (filename[strlen (filename) - 1] == '\\'))
+ struct GNUNET_FS_DownloadContext *dc = cls;
+ struct GNUNET_FS_ProgressInfo pi;
+
+ if (dc->top != NULL)
+ GNUNET_FS_end_top (dc->h, dc->top);
+ while (NULL != dc->child_head)
+ GNUNET_FS_download_signal_suspend_ (dc->child_head);
+ if (dc->search != NULL)
{
- realFN =
- GNUNET_malloc (strlen (filename) + strlen (GNUNET_DIRECTORY_EXT));
- strcpy (realFN, filename);
- realFN[strlen (filename) - 1] = '\0';
- strcat (realFN, GNUNET_DIRECTORY_EXT);
+ dc->search->download = NULL;
+ dc->search = NULL;
}
- else
+ if (dc->job_queue != NULL)
{
- realFN = GNUNET_strdup (filename);
- }
- path = GNUNET_malloc (strlen (realFN) * strlen (GNUNET_DIRECTORY_EXT) + 1);
- strcpy (path, realFN);
- pos = path;
- while (*pos != '\0')
- {
- if (*pos == DIR_SEPARATOR)
- {
- *pos = '\0';
- if ((0 == STAT (path, &buf)) && (!S_ISDIR (buf.st_mode)))
- {
- *pos = DIR_SEPARATOR;
- memmove (pos + strlen (GNUNET_DIRECTORY_EXT),
- pos, strlen (pos));
- memcpy (pos,
- GNUNET_DIRECTORY_EXT, strlen (GNUNET_DIRECTORY_EXT));
- pos += strlen (GNUNET_DIRECTORY_EXT);
- }
- else
- {
- *pos = DIR_SEPARATOR;
- }
- }
- pos++;
- }
- GNUNET_free (realFN);
- return path;
+ GNUNET_FS_dequeue_ (dc->job_queue);
+ dc->job_queue = NULL;
+ }
+ if (dc->parent != NULL)
+ GNUNET_CONTAINER_DLL_remove (dc->parent->child_head,
+ dc->parent->child_tail,
+ dc);
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_SUSPEND;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ if (GNUNET_SCHEDULER_NO_TASK != dc->task)
+ GNUNET_SCHEDULER_cancel (dc->h->sched,
+ dc->task);
+ GNUNET_CONTAINER_multihashmap_iterate (dc->active,
+ &free_entry,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (dc->active);
+ GNUNET_free_non_null (dc->filename);
+ GNUNET_CONTAINER_meta_data_destroy (dc->meta);
+ GNUNET_FS_uri_destroy (dc->uri);
+ GNUNET_free_non_null (dc->temp_filename);
+ GNUNET_free_non_null (dc->serialization);
+ GNUNET_free (dc);
}
-/* ***************** main method **************** */
-
/**
* Download parts of a file. Note that this will store
- * the blocks at the respective offset in the given file.
- * Also, the download is still using the blocking of the
- * underlying ECRS encoding. As a result, the download
- * may *write* outside of the given boundaries (if offset
- * and length do not match the 32k ECRS block boundaries).
- * <p>
+ * the blocks at the respective offset in the given file. Also, the
+ * download is still using the blocking of the underlying FS
+ * encoding. As a result, the download may *write* outside of the
+ * given boundaries (if offset and length do not match the 32k FS
+ * block boundaries). <p>
*
* This function should be used to focus a download towards a
* particular portion of the file (optimization), not to strictly
* limit the download to exactly those bytes.
*
- * @param uri the URI of the file (determines what to download)
- * @param filename where to store the file
- * @param no_temporaries set to GNUNET_YES to disallow generation of temporary files
- * @param start starting offset
- * @param length length of the download (starting at offset)
- */
-struct GNUNET_ECRS_DownloadContext *
-GNUNET_ECRS_file_download_partial_start (struct GNUNET_GE_Context *ectx,
- struct GNUNET_GC_Configuration *cfg,
- struct GNUNET_FS_SearchContext *sc,
- const struct GNUNET_ECRS_URI *uri,
- const char *filename,
- unsigned long long offset,
- unsigned long long length,
- unsigned int anonymityLevel,
- int no_temporaries,
- GNUNET_ECRS_DownloadProgressCallback
- dpcb, void *dpcbClosure)
+ * @param h handle to the file sharing subsystem
+ * @param uri the URI of the file (determines what to download); CHK or LOC URI
+ * @param meta known metadata for the file (can be NULL)
+ * @param filename where to store the file, maybe NULL (then no file is
+ * created on disk and data must be grabbed from the callbacks)
+ * @param tempname where to store temporary file data, not used if filename is non-NULL;
+ * can be NULL (in which case we will pick a name if needed); the temporary file
+ * may already exist, in which case we will try to use the data that is there and
+ * if it is not what is desired, will overwrite it
+ * @param offset at what offset should we start the download (typically 0)
+ * @param length how many bytes should be downloaded starting at offset
+ * @param anonymity anonymity level to use for the download
+ * @param options various options
+ * @param cctx initial value for the client context for this download
+ * @param parent parent download to associate this download with (use NULL
+ * for top-level downloads; useful for manually-triggered recursive downloads)
+ * @return context that can be used to control this download
+ */
+struct GNUNET_FS_DownloadContext *
+GNUNET_FS_download_start (struct GNUNET_FS_Handle *h,
+ const struct GNUNET_FS_Uri *uri,
+ const struct GNUNET_CONTAINER_MetaData *meta,
+ const char *filename,
+ const char *tempname,
+ uint64_t offset,
+ uint64_t length,
+ uint32_t anonymity,
+ enum GNUNET_FS_DownloadOptions options,
+ void *cctx,
+ struct GNUNET_FS_DownloadContext *parent)
{
- struct GNUNET_ECRS_DownloadContext *rm;
- struct stat buf;
- struct Node *top;
- int ret;
-
- if ((!GNUNET_ECRS_uri_test_chk (uri)) && (!GNUNET_ECRS_uri_test_loc (uri)))
- {
- GNUNET_GE_BREAK (ectx, 0);
+ struct GNUNET_FS_ProgressInfo pi;
+ struct GNUNET_FS_DownloadContext *dc;
+
+ GNUNET_assert (GNUNET_FS_uri_test_chk (uri));
+ if ( (offset + length < offset) ||
+ (offset + length > uri->data.chk.file_length) )
+ {
+ GNUNET_break (0);
return NULL;
}
- rm = GNUNET_malloc (sizeof (struct GNUNET_ECRS_DownloadContext));
- memset (rm, 0, sizeof (struct GNUNET_ECRS_DownloadContext));
- if (sc == NULL)
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Starting download `%s' of %llu bytes\n",
+ filename,
+ (unsigned long long) length);
+#endif
+ dc = GNUNET_malloc (sizeof(struct GNUNET_FS_DownloadContext));
+ dc->h = h;
+ dc->parent = parent;
+ if (parent != NULL)
{
- rm->sctx = GNUNET_FS_create_search_context (ectx, cfg);
- if (rm->sctx == NULL)
- {
- GNUNET_free (rm);
- return NULL;
- }
- rm->my_sctx = GNUNET_YES;
+ GNUNET_CONTAINER_DLL_insert (parent->child_head,
+ parent->child_tail,
+ dc);
}
- else
+ dc->uri = GNUNET_FS_uri_dup (uri);
+ dc->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
+ dc->client_info = cctx;
+ dc->start_time = GNUNET_TIME_absolute_get ();
+ if (NULL != filename)
{
- rm->sctx = sc;
- rm->my_sctx = GNUNET_NO;
- }
- rm->ectx = ectx;
- rm->cfg = cfg;
- rm->startTime = GNUNET_get_time ();
- rm->anonymityLevel = anonymityLevel;
- rm->offset = offset;
- rm->length = length;
- rm->dpcb = dpcb;
- rm->dpcbClosure = dpcbClosure;
- rm->main = GNUNET_thread_get_self ();
- rm->total = GNUNET_ntohll (uri->data.fi.file_length);
- rm->filename =
- filename != NULL ? get_real_download_filename (ectx, filename) : NULL;
-
- if ((rm->filename != NULL) &&
- (GNUNET_SYSERR ==
- GNUNET_disk_directory_create_for_file (ectx, rm->filename)))
- {
- free_request_manager (rm);
- return NULL;
+ dc->filename = GNUNET_strdup (filename);
+ if (GNUNET_YES == GNUNET_DISK_file_test (filename))
+ GNUNET_DISK_file_size (filename,
+ &dc->old_file_size,
+ GNUNET_YES);
}
- if (0 == rm->total)
- {
- if (rm->filename != NULL)
- {
- ret = GNUNET_disk_file_open (ectx,
- rm->filename,
- O_CREAT | O_WRONLY | O_TRUNC,
- S_IRUSR | S_IWUSR);
- if (ret == -1)
- {
- free_request_manager (rm);
- return NULL;
- }
- CLOSE (ret);
- }
- dpcb (0, 0, rm->startTime, 0, NULL, 0, dpcbClosure);
- free_request_manager (rm);
- return NULL;
+ if (GNUNET_FS_uri_test_loc (dc->uri))
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_FS_uri_loc_get_peer_identity (dc->uri,
+ &dc->target));
+ dc->offset = offset;
+ dc->length = length;
+ dc->anonymity = anonymity;
+ dc->options = options;
+ dc->active = GNUNET_CONTAINER_multihashmap_create (1 + 2 * (length / DBLOCK_SIZE));
+ dc->treedepth = GNUNET_FS_compute_depth (GNUNET_ntohll(dc->uri->data.chk.file_length));
+ if ( (filename == NULL) &&
+ (is_recursive_download (dc) ) )
+ {
+ if (tempname != NULL)
+ dc->temp_filename = GNUNET_strdup (tempname);
+ else
+ dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
}
- rm->treedepth = GNUNET_ECRS_compute_depth (rm->total);
- if ((NULL != rm->filename) &&
- ((0 == STAT (rm->filename, &buf))
- && ((size_t) buf.st_size > rm->total)))
- {
- /* if exists and oversized, truncate */
- if (truncate (rm->filename, rm->total) != 0)
- {
- GNUNET_GE_LOG_STRERROR_FILE (ectx,
- GNUNET_GE_ERROR | GNUNET_GE_ADMIN |
- GNUNET_GE_BULK, "truncate",
- rm->filename);
- free_request_manager (rm);
- return NULL;
- }
- }
- if (rm->filename != NULL)
- {
- rm->handle = GNUNET_disk_file_open (ectx,
- rm->filename,
- O_CREAT | O_RDWR,
- S_IRUSR | S_IWUSR);
- if (rm->handle < 0)
- {
- free_request_manager (rm);
- return NULL;
- }
+
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Download tree has depth %u\n",
+ dc->treedepth);
+#endif
+ if (parent == NULL)
+ {
+ dc->top = GNUNET_FS_make_top (dc->h,
+ &GNUNET_FS_download_signal_suspend_,
+ dc);
}
- else
- rm->handle = -1;
- if (GNUNET_ECRS_uri_test_loc (uri))
- {
- GNUNET_hash (&uri->data.loc.peer, sizeof (GNUNET_RSA_PublicKey),
- &rm->target.hashPubKey);
- rm->have_target = GNUNET_YES;
- }
- top = GNUNET_malloc (sizeof (struct Node));
- memset (top, 0, sizeof (struct Node));
- top->ctx = rm;
- top->chk = uri->data.fi.chk;
- top->offset = 0;
- top->level = rm->treedepth;
- if (GNUNET_NO == check_node_present (top))
- add_request (top);
- else
- GNUNET_free (top);
- return rm;
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
+ pi.value.download.specifics.start.meta = meta;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ schedule_block_download (dc,
+ &dc->uri->data.chk.chk,
+ 0,
+ 1 /* 0 == CHK, 1 == top */);
+ GNUNET_FS_download_sync_ (dc);
+ GNUNET_FS_download_start_downloading_ (dc);
+ return dc;
}
-int
-GNUNET_ECRS_file_download_partial_stop (struct GNUNET_ECRS_DownloadContext
- *rm)
-{
- int ret;
-
- ret = rm->abortFlag;
- free_request_manager (rm);
- if (ret == GNUNET_NO)
- ret = GNUNET_OK; /* normal termination */
- return ret;
-}
/**
- * Download parts of a file. Note that this will store
- * the blocks at the respective offset in the given file.
- * Also, the download is still using the blocking of the
- * underlying ECRS encoding. As a result, the download
- * may *write* outside of the given boundaries (if offset
- * and length do not match the 32k ECRS block boundaries).
- * <p>
+ * Download parts of a file based on a search result. The download
+ * will be associated with the search result (and the association
+ * will be preserved when serializing/deserializing the state).
+ * If the search is stopped, the download will not be aborted but
+ * be 'promoted' to a stand-alone download.
*
- * This function should be used to focus a download towards a
+ * As with the other download function, this will store
+ * the blocks at the respective offset in the given file. Also, the
+ * download is still using the blocking of the underlying FS
+ * encoding. As a result, the download may *write* outside of the
+ * given boundaries (if offset and length do not match the 32k FS
+ * block boundaries). <p>
+ *
+ * The given range can be used to focus a download towards a
* particular portion of the file (optimization), not to strictly
* limit the download to exactly those bytes.
*
- * @param uri the URI of the file (determines what to download)
- * @param filename where to store the file
- * @param no_temporaries set to GNUNET_YES to disallow generation of temporary files
- * @param start starting offset
- * @param length length of the download (starting at offset)
- */
-int
-GNUNET_ECRS_file_download_partial (struct GNUNET_GE_Context *ectx,
- struct GNUNET_GC_Configuration *cfg,
- const struct GNUNET_ECRS_URI *uri,
- const char *filename,
- unsigned long long offset,
- unsigned long long length,
- unsigned int anonymityLevel,
- int no_temporaries,
- GNUNET_ECRS_DownloadProgressCallback dpcb,
- void *dpcbClosure,
- GNUNET_ECRS_TestTerminate tt,
- void *ttClosure)
+ * @param h handle to the file sharing subsystem
+ * @param sr the search result to use for the download (determines uri and
+ * meta data and associations)
+ * @param filename where to store the file, maybe NULL (then no file is
+ * created on disk and data must be grabbed from the callbacks)
+ * @param tempname where to store temporary file data, not used if filename is non-NULL;
+ * can be NULL (in which case we will pick a name if needed); the temporary file
+ * may already exist, in which case we will try to use the data that is there and
+ * if it is not what is desired, will overwrite it
+ * @param offset at what offset should we start the download (typically 0)
+ * @param length how many bytes should be downloaded starting at offset
+ * @param anonymity anonymity level to use for the download
+ * @param options various download options
+ * @param cctx initial value for the client context for this download
+ * @return context that can be used to control this download
+ */
+struct GNUNET_FS_DownloadContext *
+GNUNET_FS_download_start_from_search (struct GNUNET_FS_Handle *h,
+ struct GNUNET_FS_SearchResult *sr,
+ const char *filename,
+ const char *tempname,
+ uint64_t offset,
+ uint64_t length,
+ uint32_t anonymity,
+ enum GNUNET_FS_DownloadOptions options,
+ void *cctx)
{
- struct GNUNET_ECRS_DownloadContext *rm;
- int ret;
-
- if (length == 0)
- return GNUNET_OK;
- rm = GNUNET_ECRS_file_download_partial_start (ectx,
- cfg,
- NULL,
- uri,
- filename,
- offset,
- length,
- anonymityLevel,
- no_temporaries,
- dpcb, dpcbClosure);
- if (rm == NULL)
- return GNUNET_SYSERR;
- while ((GNUNET_OK == tt (ttClosure)) &&
- (GNUNET_YES != GNUNET_shutdown_test ()) &&
- (rm->abortFlag == GNUNET_NO) && (rm->head != NULL))
- GNUNET_thread_sleep (5 * GNUNET_CRON_SECONDS);
- ret = GNUNET_ECRS_file_download_partial_stop (rm);
- return ret;
+ struct GNUNET_FS_ProgressInfo pi;
+ struct GNUNET_FS_DownloadContext *dc;
+
+ if ( (sr == NULL) ||
+ (sr->download != NULL) )
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ GNUNET_assert (GNUNET_FS_uri_test_chk (sr->uri));
+ if ( (offset + length < offset) ||
+ (offset + length > sr->uri->data.chk.file_length) )
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Starting download `%s' of %llu bytes\n",
+ filename,
+ (unsigned long long) length);
+#endif
+ dc = GNUNET_malloc (sizeof(struct GNUNET_FS_DownloadContext));
+ dc->h = h;
+ dc->search = sr;
+ sr->download = dc;
+ if (sr->probe_ctx != NULL)
+ {
+ GNUNET_FS_download_stop (sr->probe_ctx, GNUNET_YES);
+ sr->probe_ctx = NULL;
+ }
+ dc->uri = GNUNET_FS_uri_dup (sr->uri);
+ dc->meta = GNUNET_CONTAINER_meta_data_duplicate (sr->meta);
+ dc->client_info = cctx;
+ dc->start_time = GNUNET_TIME_absolute_get ();
+ if (NULL != filename)
+ {
+ dc->filename = GNUNET_strdup (filename);
+ if (GNUNET_YES == GNUNET_DISK_file_test (filename))
+ GNUNET_DISK_file_size (filename,
+ &dc->old_file_size,
+ GNUNET_YES);
+ }
+ if (GNUNET_FS_uri_test_loc (dc->uri))
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_FS_uri_loc_get_peer_identity (dc->uri,
+ &dc->target));
+ dc->offset = offset;
+ dc->length = length;
+ dc->anonymity = anonymity;
+ dc->options = options;
+ dc->active = GNUNET_CONTAINER_multihashmap_create (1 + 2 * (length / DBLOCK_SIZE));
+ dc->treedepth = GNUNET_FS_compute_depth (GNUNET_ntohll(dc->uri->data.chk.file_length));
+ if ( (filename == NULL) &&
+ (is_recursive_download (dc) ) )
+ {
+ if (tempname != NULL)
+ dc->temp_filename = GNUNET_strdup (tempname);
+ else
+ dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
+ }
+
+#if DEBUG_DOWNLOAD
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Download tree has depth %u\n",
+ dc->treedepth);
+#endif
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
+ pi.value.download.specifics.start.meta = dc->meta;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ schedule_block_download (dc,
+ &dc->uri->data.chk.chk,
+ 0,
+ 1 /* 0 == CHK, 1 == top */);
+ GNUNET_FS_download_sync_ (dc);
+ GNUNET_FS_download_start_downloading_ (dc);
+ return dc;
}
+
/**
- * Download a file (simplified API).
+ * Start the downloading process (by entering the queue).
*
- * @param uri the URI of the file (determines what to download)
- * @param filename where to store the file
- */
-int
-GNUNET_ECRS_file_download (struct GNUNET_GE_Context *ectx,
- struct GNUNET_GC_Configuration *cfg,
- const struct GNUNET_ECRS_URI *uri,
- const char *filename,
- unsigned int anonymityLevel,
- GNUNET_ECRS_DownloadProgressCallback dpcb,
- void *dpcbClosure, GNUNET_ECRS_TestTerminate tt,
- void *ttClosure)
+ * @param dc our download context
+ */
+void
+GNUNET_FS_download_start_downloading_ (struct GNUNET_FS_DownloadContext *dc)
{
- return GNUNET_ECRS_file_download_partial (ectx,
- cfg,
- uri,
- filename,
- 0,
- GNUNET_ECRS_uri_get_file_size
- (uri), anonymityLevel, GNUNET_NO,
- dpcb, dpcbClosure, tt, ttClosure);
+ GNUNET_assert (dc->job_queue == NULL);
+ dc->job_queue = GNUNET_FS_queue_ (dc->h,
+ &activate_fs_download,
+ &deactivate_fs_download,
+ dc,
+ (dc->length + DBLOCK_SIZE-1) / DBLOCK_SIZE);
}
-#endif
+
+/**
+ * Stop a download (aborts if download is incomplete).
+ *
+ * @param dc handle for the download
+ * @param do_delete delete files of incomplete downloads
+ */
+void
+GNUNET_FS_download_stop (struct GNUNET_FS_DownloadContext *dc,
+ int do_delete)
+{
+ struct GNUNET_FS_ProgressInfo pi;
+ int have_children;
+
+ if (dc->top != NULL)
+ GNUNET_FS_end_top (dc->h, dc->top);
+ if (dc->search != NULL)
+ {
+ dc->search->download = NULL;
+ dc->search = NULL;
+ }
+ if (dc->job_queue != NULL)
+ {
+ GNUNET_FS_dequeue_ (dc->job_queue);
+ dc->job_queue = NULL;
+ }
+ have_children = (NULL != dc->child_head) ? GNUNET_YES : GNUNET_NO;
+ while (NULL != dc->child_head)
+ GNUNET_FS_download_stop (dc->child_head,
+ do_delete);
+ if (dc->parent != NULL)
+ GNUNET_CONTAINER_DLL_remove (dc->parent->child_head,
+ dc->parent->child_tail,
+ dc);
+ if (dc->serialization != NULL)
+ GNUNET_FS_remove_sync_file_ (dc->h,
+ ( (dc->parent != NULL) || (dc->search != NULL) )
+ ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD
+ : GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD ,
+ dc->serialization);
+ if ( (GNUNET_YES == have_children) &&
+ (dc->parent == NULL) )
+ GNUNET_FS_remove_sync_dir_ (dc->h,
+ (dc->search != NULL)
+ ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD
+ : GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD,
+ dc->serialization);
+ pi.status = GNUNET_FS_STATUS_DOWNLOAD_STOPPED;
+ GNUNET_FS_download_make_status_ (&pi, dc);
+ if (GNUNET_SCHEDULER_NO_TASK != dc->task)
+ GNUNET_SCHEDULER_cancel (dc->h->sched,
+ dc->task);
+ GNUNET_CONTAINER_multihashmap_iterate (dc->active,
+ &free_entry,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (dc->active);
+ if (dc->filename != NULL)
+ {
+ if ( (dc->completed != dc->length) &&
+ (GNUNET_YES == do_delete) )
+ {
+ if (0 != UNLINK (dc->filename))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
+ "unlink",
+ dc->filename);
+ }
+ GNUNET_free (dc->filename);
+ }
+ GNUNET_CONTAINER_meta_data_destroy (dc->meta);
+ GNUNET_FS_uri_destroy (dc->uri);
+ if (NULL != dc->temp_filename)
+ {
+ if (0 != UNLINK (dc->temp_filename))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+ "unlink",
+ dc->temp_filename);
+ GNUNET_free (dc->temp_filename);
+ }
+ GNUNET_free_non_null (dc->serialization);
+ GNUNET_free (dc);
+}
/* end of fs_download.c */
projects / oweals / gnunet.git / blobdiff