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
* @author Christian Grothoff
*
* TODO:
- * - location URI suppport (can wait, easy)
* - different priority for scheduling probe downloads?
* - check if iblocks can be computed from existing blocks (can wait, hard)
*/
#include "fs.h"
#include "fs_tree.h"
-#define DEBUG_DOWNLOAD GNUNET_NO
+#define DEBUG_DOWNLOAD GNUNET_YES
/**
* Determine if the given download (options and meta data) should cause
void *value);
+/**
+ * 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_FS_DBLOCK
+ : GNUNET_BLOCK_TYPE_FS_IBLOCK;
+ prc.query = chk->query;
+ prc.do_store = do_store;
+ process_result_with_request (&prc,
+ &chk->key,
+ sm);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Closure for match_full_data.
+ */
+struct MatchDataContext
+{
+ /**
+ * CHK we are looking for.
+ */
+ const struct ContentHashKey *chk;
+
+ /**
+ * Download we're processing.
+ */
+ struct GNUNET_FS_DownloadContext *dc;
+
+ /**
+ * Request details.
+ */
+ struct DownloadRequest *sm;
+
+ /**
+ * Overall offset in the file.
+ */
+ uint64_t offset;
+
+ /**
+ * Desired length of the block.
+ */
+ size_t len;
+
+ /**
+ * Flag set to GNUNET_YES on success.
+ */
+ int done;
+};
+
+/**
+ * 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;
+
+ 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;
+}
+
/**
* Schedule the download of the specified block in the tree.
size_t len;
char block[DBLOCK_SIZE];
GNUNET_HashCode key;
- struct ProcessResultClosure prc;
+ struct MatchDataContext mdc;
struct GNUNET_DISK_FileHandle *fh;
-#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
total = GNUNET_ntohll (dc->uri->data.chk.file_length);
- off = compute_disk_offset (total,
- offset,
- depth,
- dc->treedepth);
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;
&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) )
len)) )
{
GNUNET_CRYPTO_hash (block, len, &key);
- if (0 == memcmp (&key,
- &chk->key,
- sizeof (GNUNET_HashCode)))
+ if ( (0 == memcmp (&key,
+ &chk->key,
+ sizeof (GNUNET_HashCode))) &&
+ (GNUNET_OK ==
+ encrypt_existing_match (dc,
+ chk,
+ sm,
+ block,
+ len,
+ depth,
+ GNUNET_NO)) )
{
- char enc[len];
- struct GNUNET_CRYPTO_AesSessionKey sk;
- struct GNUNET_CRYPTO_AesInitializationVector iv;
- GNUNET_HashCode query;
-
- GNUNET_CRYPTO_hash_to_aes_key (&key, &sk, &iv);
- if (-1 == GNUNET_CRYPTO_aes_encrypt (block, len,
- &sk,
- &iv,
- enc))
- {
- GNUNET_break (0);
- goto do_download;
- }
- GNUNET_CRYPTO_hash (enc, len, &query);
- if (0 == memcmp (&query,
- &chk->query,
- sizeof (GNUNET_HashCode)))
- {
-#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 = GNUNET_NO; /* useless */
- process_result_with_request (&prc,
- &key,
- sm);
- }
- else
- {
- GNUNET_break_op (0);
- }
GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
return;
}
}
- do_download:
if (fh != NULL)
GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
if (depth < dc->treedepth)
&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
+
+ }
+
}
}
+#define GNUNET_FS_URI_CHK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
+
/**
* We found an entry in a directory. Check if the respective child
* already exists and if not create the respective child download.
char *us;
char *ext;
char *dn;
+ char *pos;
char *full_name;
if (NULL == uri)
fn = NULL;
if (NULL == filename)
{
- fn = GNUNET_FS_meta_data_suggest_filename (meta);
+ 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)]);
+ fn = GNUNET_strdup (&us [strlen (GNUNET_FS_URI_CHK_PREFIX)]);
GNUNET_free (us);
}
else if (fn[0] == '.')
us = GNUNET_FS_uri_to_string (uri);
GNUNET_asprintf (&fn,
"%s%s",
- &us[strlen (GNUNET_FS_URI_PREFIX
- GNUNET_FS_URI_CHK_INFIX)], ext);
+ &us[strlen (GNUNET_FS_URI_CHK_PREFIX)], 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)
msize = 0;
sm = buf;
while ( (dc->pending != NULL) &&
- (size > msize + sizeof (struct SearchMessage)) )
+ (size >= msize + sizeof (struct SearchMessage)) )
{
#if DEBUG_DOWNLOAD
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
else
sm->options = htonl (0);
if (dc->pending->depth == dc->treedepth)
- sm->type = htonl (GNUNET_BLOCK_TYPE_DBLOCK);
+ sm->type = htonl (GNUNET_BLOCK_TYPE_FS_DBLOCK);
else
- sm->type = htonl (GNUNET_BLOCK_TYPE_IBLOCK);
+ sm->type = htonl (GNUNET_BLOCK_TYPE_FS_IBLOCK);
sm->anonymity_level = htonl (dc->anonymity);
sm->target = dc->target.hashPubKey;
sm->query = dc->pending->chk.query;
struct GNUNET_CLIENT_Connection *client;
dc->task = GNUNET_SCHEDULER_NO_TASK;
- client = GNUNET_CLIENT_connect (dc->h->sched,
- "fs",
+ client = GNUNET_CLIENT_connect ("fs",
dc->h->cfg);
if (NULL == client)
{
"Will try to reconnect in 1s\n");
#endif
dc->task
- = GNUNET_SCHEDULER_add_delayed (dc->h->sched,
- GNUNET_TIME_UNIT_SECONDS,
+ = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
&do_reconnect,
dc);
}
struct GNUNET_FS_DownloadContext *dc = cls;
struct GNUNET_FS_ProgressInfo pi;
+#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);
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);
}
{
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);
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_SCHEDULER_cancel (dc->task);
GNUNET_CONTAINER_multihashmap_iterate (dc->active,
&free_entry,
NULL);
struct GNUNET_FS_ProgressInfo pi;
struct GNUNET_FS_DownloadContext *dc;
- GNUNET_assert (GNUNET_FS_uri_test_chk (uri));
+ GNUNET_assert (GNUNET_FS_uri_test_chk (uri) ||
+ GNUNET_FS_uri_test_loc (uri) );
+
if ( (offset + length < offset) ||
- (offset + length > uri->data.chk.file_length) )
+ (offset + length > GNUNET_FS_uri_chk_get_file_size (uri)) )
{
GNUNET_break (0);
return NULL;
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));
+ dc->treedepth = GNUNET_FS_compute_depth (GNUNET_FS_uri_chk_get_file_size(dc->uri));
if ( (filename == NULL) &&
(is_recursive_download (dc) ) )
{
pi.value.download.specifics.start.meta = meta;
GNUNET_FS_download_make_status_ (&pi, dc);
schedule_block_download (dc,
- &dc->uri->data.chk.chk,
+ (dc->uri->type == chk)
+ ? &dc->uri->data.chk.chk
+ : &dc->uri->data.loc.fi.chk,
0,
1 /* 0 == CHK, 1 == top */);
GNUNET_FS_download_sync_ (dc);
GNUNET_break (0);
return NULL;
}
- GNUNET_assert (GNUNET_FS_uri_test_chk (sr->uri));
+ GNUNET_assert (GNUNET_FS_uri_test_chk (sr->uri) ||
+ GNUNET_FS_uri_test_loc (sr->uri) );
if ( (offset + length < offset) ||
(offset + length > sr->uri->data.chk.file_length) )
{
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_SCHEDULER_cancel (dc->task);
GNUNET_CONTAINER_multihashmap_iterate (dc->active,
&free_entry,
NULL);
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