src/fs/fs_publish.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009, 2010 Christian Grothoff (and other contributing authors)
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 2, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file fs/fs_publish.c
  23  * @brief publish a file or directory in GNUnet
  24  * @see http://gnunet.org/encoding.php3
  25  * @author Krista Bennett
  26  * @author Christian Grothoff
  27  *
  28  * TODO:
  29  * - indexing cleanup: unindex on failure (can wait)
  30  * - persistence support (can wait)
  31  * - datastore reservation support (optimization)
  32  * - location URIs (publish with anonymity-level zero)
  33  */
  34
  35 #include "platform.h"
  36 #include "gnunet_constants.h"
  37 #include "gnunet_signatures.h"
  38 #include "gnunet_util_lib.h"
  39 #include "gnunet_fs_service.h"
  40 #include "fs.h"
  41 #include "fs_tree.h"
  42
  43 #define DEBUG_PUBLISH GNUNET_NO
  44
  45 /**
  46  * Main function that performs the upload.
  47  * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
  48  * @param tc task context
  49  */
  50 static void
  51 do_upload (void *cls,
  52            const struct GNUNET_SCHEDULER_TaskContext *tc);
  53
  54
  55 /**
  56  * Context for "ds_put_cont".
  57  */
  58 struct PutContCtx
  59 {
  60   /**
  61    * Current publishing context.
  62    */
  63   struct GNUNET_FS_PublishContext *sc;
  64
  65   /**
  66    * Specific file with the block.
  67    */
  68   struct GNUNET_FS_FileInformation *p;
  69
  70   /**
  71    * Function to run next, if any (can be NULL).
  72    */
  73   GNUNET_SCHEDULER_Task cont;
  74
  75   /**
  76    * Closure for cont.
  77    */
  78   void *cont_cls;
  79 };
  80
  81
  82 /**
  83  * Fill in all of the generic fields for
  84  * a publish event.
  85  *
  86  * @param pi structure to fill in
  87  * @param sc overall publishing context
  88  * @param p file information for the file being published
  89  * @param offset where in the file are we so far
  90  */
  91 static void
  92 make_publish_status (struct GNUNET_FS_ProgressInfo *pi,
  93                      struct GNUNET_FS_PublishContext *sc,
  94                      const struct GNUNET_FS_FileInformation *p,
  95                      uint64_t offset)
  96 {
  97   pi->value.publish.sc = sc;
  98   pi->value.publish.fi = p;
  99   pi->value.publish.cctx
 100     = p->client_info;
 101   pi->value.publish.pctx
 102     = (NULL == p->dir) ? NULL : p->dir->client_info;
 103   pi->value.publish.filename
 104     = (p->is_directory) ? p->data.dir.dirname : p->data.file.filename;
 105   pi->value.publish.size
 106     = (p->is_directory) ? p->data.dir.dir_size : p->data.file.file_size;
 107   pi->value.publish.eta
 108     = GNUNET_TIME_calculate_eta (p->start_time,
 109                                  offset,
 110                                  pi->value.publish.size);
 111   pi->value.publish.completed = offset;
 112   pi->value.publish.duration = GNUNET_TIME_absolute_get_duration (p->start_time);
 113   pi->value.publish.anonymity = p->anonymity;
 114 }
 115
 116
 117 /**
 118  * Cleanup the publish context, we're done
 119  * with it.
 120  *
 121  * @param sc struct to clean up after
 122  */
 123 static void
 124 publish_cleanup (struct GNUNET_FS_PublishContext *sc)
 125 {
 126   GNUNET_FS_file_information_destroy (sc->fi, NULL, NULL);
 127   if (sc->namespace != NULL)
 128     GNUNET_FS_namespace_delete (sc->namespace, GNUNET_NO);
 129   GNUNET_free_non_null (sc->nid);
 130   GNUNET_free_non_null (sc->nuid);
 131   GNUNET_DATASTORE_disconnect (sc->dsh, GNUNET_NO);
 132   GNUNET_free (sc);
 133 }
 134
 135
 136 /**
 137  * Function called by the datastore API with
 138  * the result from the PUT request.
 139  *
 140  * @param cls our closure
 141  * @param success GNUNET_OK on success
 142  * @param msg error message (or NULL)
 143  */
 144 static void
 145 ds_put_cont (void *cls,
 146              int success,
 147              const char *msg)
 148 {
 149   struct PutContCtx *pcc = cls;
 150   struct GNUNET_FS_ProgressInfo pi;
 151
 152   if (GNUNET_SYSERR == pcc->sc->in_network_wait)
 153     {
 154       /* we were aborted in the meantime,
 155          finish shutdown! */
 156       publish_cleanup (pcc->sc);
 157       return;
 158     }
 159   GNUNET_assert (GNUNET_YES == pcc->sc->in_network_wait);
 160   pcc->sc->in_network_wait = GNUNET_NO;
 161   if (GNUNET_OK != success)
 162     {
 163       GNUNET_asprintf (&pcc->p->emsg,
 164                        _("Upload failed: %s"),
 165                        msg);
 166       GNUNET_FS_file_information_sync (pcc->p);
 167       pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 168       make_publish_status (&pi, pcc->sc, pcc->p, 0);
 169       pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 170       pi.value.publish.specifics.error.message = pcc->p->emsg;
 171       pcc->p->client_info
 172         = pcc->sc->h->upcb (pcc->sc->h->upcb_cls,
 173                             &pi);
 174     }
 175   GNUNET_FS_file_information_sync (pcc->p);
 176   if (NULL != pcc->cont)
 177     pcc->sc->upload_task
 178       = GNUNET_SCHEDULER_add_with_priority (pcc->sc->h->sched,
 179                                             GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 180                                             pcc->cont,
 181                                             pcc->cont_cls);
 182   GNUNET_free (pcc);
 183 }
 184
 185
 186 /**
 187  * Generate the callback that signals clients
 188  * that a file (or directory) has been completely
 189  * published.
 190  *
 191  * @param p the completed upload
 192  * @param sc context of the publication
 193  */
 194 static void
 195 signal_publish_completion (struct GNUNET_FS_FileInformation *p,
 196                            struct GNUNET_FS_PublishContext *sc)
 197 {
 198   struct GNUNET_FS_ProgressInfo pi;
 199
 200   pi.status = GNUNET_FS_STATUS_PUBLISH_COMPLETED;
 201   make_publish_status (&pi, sc, p,
 202                        GNUNET_ntohll (p->chk_uri->data.chk.file_length));
 203   pi.value.publish.eta = GNUNET_TIME_UNIT_ZERO;
 204   pi.value.publish.specifics.completed.chk_uri = p->chk_uri;
 205   p->client_info
 206     = sc->h->upcb (sc->h->upcb_cls,
 207                   &pi);
 208 }
 209
 210
 211 /**
 212  * Generate the callback that signals clients
 213  * that a file (or directory) has encountered
 214  * a problem during publication.
 215  *
 216  * @param p the upload that had trouble
 217  * @param sc context of the publication
 218  * @param emsg error message
 219  */
 220 static void
 221 signal_publish_error (struct GNUNET_FS_FileInformation *p,
 222                       struct GNUNET_FS_PublishContext *sc,
 223                       const char *emsg)
 224 {
 225   struct GNUNET_FS_ProgressInfo pi;
 226
 227   p->emsg = GNUNET_strdup (emsg);
 228   pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 229   make_publish_status (&pi, sc, p, 0);
 230   pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 231   pi.value.publish.specifics.error.message =emsg;
 232   p->client_info
 233     = sc->h->upcb (sc->h->upcb_cls,
 234                   &pi);
 235 }
 236
 237
 238 /**
 239  * We've finished publishing the SBlock as part of a larger upload.
 240  * Check the result and complete the larger upload.
 241  *
 242  * @param cls the "struct GNUNET_FS_PublishContext*" of the larger upload
 243  * @param uri URI of the published SBlock
 244  * @param emsg NULL on success, otherwise error message
 245  */
 246 static void
 247 publish_sblocks_cont (void *cls,
 248                       const struct GNUNET_FS_Uri *uri,
 249                       const char *emsg)
 250 {
 251   struct GNUNET_FS_PublishContext *sc = cls;
 252   if (NULL != emsg)
 253     {
 254       signal_publish_error (sc->fi,
 255                             sc,
 256                             emsg);
 257       return;
 258     }
 259   // FIXME: release the datastore reserve here!
 260   signal_publish_completion (sc->fi, sc);
 261   sc->all_done = GNUNET_YES;
 262 }
 263
 264
 265 /**
 266  * We are almost done publishing the structure,
 267  * add SBlocks (if needed).
 268  *
 269  * @param sc overall upload data
 270  */
 271 static void
 272 publish_sblock (struct GNUNET_FS_PublishContext *sc)
 273 {
 274   if (NULL != sc->namespace)
 275     GNUNET_FS_publish_sks (sc->h,
 276                            sc->namespace,
 277                            sc->nid,
 278                            sc->nuid,
 279                            sc->fi->meta,
 280                            sc->fi->chk_uri,
 281                            sc->fi->expirationTime,
 282                            sc->fi->anonymity,
 283                            sc->fi->priority,
 284                            sc->options,
 285                            &publish_sblocks_cont,
 286                            sc);
 287   else
 288     publish_sblocks_cont (sc, NULL, NULL);
 289 }
 290
 291
 292 /**
 293  * We've finished publishing a KBlock as part of a larger upload.
 294  * Check the result and continue the larger upload.
 295  *
 296  * @param cls the "struct GNUNET_FS_PublishContext*"
 297  *        of the larger upload
 298  * @param uri URI of the published blocks
 299  * @param emsg NULL on success, otherwise error message
 300  */
 301 static void
 302 publish_kblocks_cont (void *cls,
 303                       const struct GNUNET_FS_Uri *uri,
 304                       const char *emsg)
 305 {
 306   struct GNUNET_FS_PublishContext *sc = cls;
 307   struct GNUNET_FS_FileInformation *p = sc->fi_pos;
 308
 309   if (NULL != emsg)
 310     {
 311       signal_publish_error (p, sc, emsg);
 312       sc->upload_task
 313         = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 314                                               GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 315                                               &do_upload,
 316                                               sc);
 317       return;
 318     }
 319   GNUNET_FS_file_information_sync (p);
 320   if (NULL != p->dir)
 321     signal_publish_completion (p, sc);
 322   /* move on to next file */
 323   if (NULL != p->next)
 324     sc->fi_pos = p->next;
 325   else
 326     sc->fi_pos = p->dir;
 327   sc->upload_task
 328     = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 329                                           GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 330                                           &do_upload,
 331                                           sc);
 332 }
 333
 334
 335 /**
 336  * Function called by the tree encoder to obtain
 337  * a block of plaintext data (for the lowest level
 338  * of the tree).
 339  *
 340  * @param cls our publishing context
 341  * @param offset identifies which block to get
 342  * @param max (maximum) number of bytes to get; returning
 343  *        fewer will also cause errors
 344  * @param buf where to copy the plaintext buffer
 345  * @param emsg location to store an error message (on error)
 346  * @return number of bytes copied to buf, 0 on error
 347  */
 348 static size_t
 349 block_reader (void *cls,
 350               uint64_t offset,
 351               size_t max,
 352               void *buf,
 353               char **emsg)
 354 {
 355   struct GNUNET_FS_PublishContext *sc = cls;
 356   struct GNUNET_FS_FileInformation *p;
 357   size_t pt_size;
 358   const char *dd;
 359
 360   p = sc->fi_pos;
 361   if (p->is_directory)
 362     {
 363       pt_size = GNUNET_MIN(max,
 364                            p->data.dir.dir_size - offset);
 365       dd = p->data.dir.dir_data;
 366       memcpy (buf,
 367               &dd[offset],
 368               pt_size);
 369     }
 370   else
 371     {
 372       pt_size = GNUNET_MIN(max,
 373                            p->data.file.file_size - offset);
 374       if (pt_size == 0)
 375         return 0; /* calling reader with pt_size==0
 376                      might free buf, so don't! */
 377       if (pt_size !=
 378           p->data.file.reader (p->data.file.reader_cls,
 379                                offset,
 380                                pt_size,
 381                                buf,
 382                                emsg))
 383         return 0;
 384     }
 385   return pt_size;
 386 }
 387
 388
 389 /**
 390  * The tree encoder has finished processing a
 391  * file.   Call it's finish method and deal with
 392  * the final result.
 393  *
 394  * @param cls our publishing context
 395  * @param tc scheduler's task context (not used)
 396  */
 397 static void
 398 encode_cont (void *cls,
 399              const struct GNUNET_SCHEDULER_TaskContext *tc)
 400 {
 401   struct GNUNET_FS_PublishContext *sc = cls;
 402   struct GNUNET_FS_FileInformation *p;
 403   struct GNUNET_FS_ProgressInfo pi;
 404   char *emsg;
 405
 406   p = sc->fi_pos;
 407   GNUNET_FS_tree_encoder_finish (p->te,
 408                                  &p->chk_uri,
 409                                  &emsg);
 410   p->te = NULL;
 411   if (NULL != emsg)
 412     {
 413       GNUNET_asprintf (&p->emsg,
 414                        _("Upload failed: %s"),
 415                        emsg);
 416       GNUNET_free (emsg);
 417       GNUNET_FS_file_information_sync (p);
 418       pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 419       make_publish_status (&pi, sc, p, 0);
 420       pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 421       pi.value.publish.specifics.error.message = p->emsg;
 422       p->client_info
 423         = sc->h->upcb (sc->h->upcb_cls,
 424                        &pi);
 425     }
 426   /* continue with main */
 427   sc->upload_task
 428     = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 429                                           GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 430                                     &do_upload,
 431                                     sc);
 432 }
 433
 434
 435 /**
 436  * Function called asking for the current (encoded)
 437  * block to be processed.  After processing the
 438  * client should either call "GNUNET_FS_tree_encode_next"
 439  * or (on error) "GNUNET_FS_tree_encode_finish".
 440  *
 441  * @param cls closure
 442  * @param query the query for the block (key for lookup in the datastore)
 443  * @param offset offset of the block in the file
 444  * @param type type of the block (IBLOCK or DBLOCK)
 445  * @param block the (encrypted) block
 446  * @param block_size size of block (in bytes)
 447  */
 448 static void
 449 block_proc (void *cls,
 450             const GNUNET_HashCode *query,
 451             uint64_t offset,
 452             uint32_t type,
 453             const void *block,
 454             uint16_t block_size)
 455 {
 456   struct GNUNET_FS_PublishContext *sc = cls;
 457   struct GNUNET_FS_FileInformation *p;
 458   struct PutContCtx * dpc_cls;
 459   struct OnDemandBlock odb;
 460
 461   p = sc->fi_pos;
 462   if (NULL == sc->dsh)
 463     {
 464       sc->upload_task
 465         = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 466                                         GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 467                                         &do_upload,
 468                                         sc);
 469       return;
 470     }
 471
 472   GNUNET_assert (GNUNET_NO == sc->in_network_wait);
 473   sc->in_network_wait = GNUNET_YES;
 474   dpc_cls = GNUNET_malloc(sizeof(struct PutContCtx));
 475   dpc_cls->cont = &do_upload;
 476   dpc_cls->cont_cls = sc;
 477   dpc_cls->sc = sc;
 478   dpc_cls->p = p;
 479   if ( (! p->is_directory) &&
 480        (GNUNET_YES == p->data.file.do_index) &&
 481        (type == GNUNET_DATASTORE_BLOCKTYPE_DBLOCK) )
 482     {
 483 #if DEBUG_PUBLISH
 484       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 485                   "Indexing block `%s' for offset %llu with index size %u\n",
 486                   GNUNET_h2s (query),
 487                   (unsigned long long) offset,
 488                   sizeof (struct OnDemandBlock));
 489 #endif
 490       odb.offset = GNUNET_htonll (offset);
 491       odb.file_id = p->data.file.file_id;
 492       GNUNET_DATASTORE_put (sc->dsh,
 493                             sc->rid,
 494                             query,
 495                             sizeof(struct OnDemandBlock),
 496                             &odb,
 497                             GNUNET_DATASTORE_BLOCKTYPE_ONDEMAND,
 498                             p->priority,
 499                             p->anonymity,
 500                             p->expirationTime,
 501                             GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 502                             &ds_put_cont,
 503                             dpc_cls);
 504       return;
 505     }
 506 #if DEBUG_PUBLISH
 507   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 508               "Publishing block `%s' for offset %llu with size %u\n",
 509               GNUNET_h2s (query),
 510               (unsigned long long) offset,
 511               (unsigned int) block_size);
 512 #endif
 513   GNUNET_DATASTORE_put (sc->dsh,
 514                         sc->rid,
 515                         query,
 516                         block_size,
 517                         block,
 518                         type,
 519                         p->priority,
 520                         p->anonymity,
 521                         p->expirationTime,
 522                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 523                         &ds_put_cont,
 524                         dpc_cls);
 525 }
 526
 527
 528 /**
 529  * Function called with information about our
 530  * progress in computing the tree encoding.
 531  *
 532  * @param cls closure
 533  * @param offset where are we in the file
 534  * @param pt_block plaintext of the currently processed block
 535  * @param pt_size size of pt_block
 536  * @param depth depth of the block in the tree
 537  */
 538 static void
 539 progress_proc (void *cls,
 540                uint64_t offset,
 541                const void *pt_block,
 542                size_t pt_size,
 543                unsigned int depth)
 544 {
 545   struct GNUNET_FS_PublishContext *sc = cls;
 546   struct GNUNET_FS_FileInformation *p;
 547   struct GNUNET_FS_ProgressInfo pi;
 548
 549   p = sc->fi_pos;
 550   pi.status = GNUNET_FS_STATUS_PUBLISH_PROGRESS;
 551   make_publish_status (&pi, sc, p, offset);
 552   pi.value.publish.specifics.progress.data = pt_block;
 553   pi.value.publish.specifics.progress.offset = offset;
 554   pi.value.publish.specifics.progress.data_len = pt_size;
 555   pi.value.publish.specifics.progress.depth = depth;
 556   p->client_info
 557     = sc->h->upcb (sc->h->upcb_cls,
 558                    &pi);
 559 }
 560
 561
 562 /**
 563  * We are uploading a file or directory; load (if necessary) the next
 564  * block into memory, encrypt it and send it to the FS service.  Then
 565  * continue with the main task.
 566  *
 567  * @param sc overall upload data
 568  */
 569 static void
 570 publish_content (struct GNUNET_FS_PublishContext *sc)
 571 {
 572   struct GNUNET_FS_FileInformation *p;
 573   char *emsg;
 574   struct GNUNET_FS_DirectoryBuilder *db;
 575   struct GNUNET_FS_FileInformation *dirpos;
 576   void *raw_data;
 577   uint64_t size;
 578
 579   p = sc->fi_pos;
 580   if (NULL == p->te)
 581     {
 582       if (p->is_directory)
 583         {
 584           db = GNUNET_FS_directory_builder_create (p->meta);
 585           dirpos = p->data.dir.entries;
 586           while (NULL != dirpos)
 587             {
 588               if (dirpos->is_directory)
 589                 {
 590                   raw_data = dirpos->data.dir.dir_data;
 591                   dirpos->data.dir.dir_data = NULL;
 592                 }
 593               else
 594                 {
 595                   raw_data = NULL;
 596                   if ( (dirpos->data.file.file_size < MAX_INLINE_SIZE) &&
 597                        (dirpos->data.file.file_size > 0) )
 598                     {
 599                       raw_data = GNUNET_malloc (dirpos->data.file.file_size);
 600                       emsg = NULL;
 601                       if (dirpos->data.file.file_size !=
 602                           dirpos->data.file.reader (dirpos->data.file.reader_cls,
 603                                                     0,
 604                                                     dirpos->data.file.file_size,
 605                                                     raw_data,
 606                                                     &emsg))
 607                         {
 608                           GNUNET_free_non_null (emsg);
 609                           GNUNET_free (raw_data);
 610                           raw_data = NULL;
 611                         }
 612                     }
 613                 }
 614               GNUNET_FS_directory_builder_add (db,
 615                                                dirpos->chk_uri,
 616                                                dirpos->meta,
 617                                                raw_data);
 618               GNUNET_free_non_null (raw_data);
 619               dirpos = dirpos->next;
 620             }
 621           GNUNET_FS_directory_builder_finish (db,
 622                                               &p->data.dir.dir_size,
 623                                               &p->data.dir.dir_data);
 624         }
 625       size = (p->is_directory)
 626         ? p->data.dir.dir_size
 627         : p->data.file.file_size;
 628       p->te = GNUNET_FS_tree_encoder_create (sc->h,
 629                                              size,
 630                                              sc,
 631                                              &block_reader,
 632                                              &block_proc,
 633                                              &progress_proc,
 634                                              &encode_cont);
 635
 636     }
 637   GNUNET_FS_tree_encoder_next (p->te);
 638 }
 639
 640
 641 /**
 642  * Process the response (or lack thereof) from
 643  * the "fs" service to our 'start index' request.
 644  *
 645  * @param cls closure (of type "struct GNUNET_FS_PublishContext*"_)
 646  * @param msg the response we got
 647  */
 648 static void
 649 process_index_start_response (void *cls,
 650                               const struct GNUNET_MessageHeader *msg)
 651 {
 652   struct GNUNET_FS_PublishContext *sc = cls;
 653   struct GNUNET_FS_FileInformation *p;
 654   const char *emsg;
 655   uint16_t msize;
 656
 657   GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
 658   sc->client = NULL;
 659   p = sc->fi_pos;
 660   if (msg == NULL)
 661     {
 662       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 663                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 664                   p->data.file.filename,
 665                   _("timeout on index-start request to `fs' service"));
 666       p->data.file.do_index = GNUNET_NO;
 667       publish_content (sc);
 668       return;
 669     }
 670   if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_INDEX_START_OK)
 671     {
 672       msize = ntohs (msg->size);
 673       emsg = (const char *) &msg[1];
 674       if ( (msize <= sizeof (struct GNUNET_MessageHeader)) ||
 675            (emsg[msize - sizeof(struct GNUNET_MessageHeader) - 1] != '\0') )
 676         emsg = gettext_noop ("unknown error");
 677       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 678                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 679                   p->data.file.filename,
 680                   gettext (emsg));
 681       p->data.file.do_index = GNUNET_NO;
 682       publish_content (sc);
 683       return;
 684     }
 685   p->data.file.index_start_confirmed = GNUNET_YES;
 686   /* success! continue with indexing */
 687   publish_content (sc);
 688 }
 689
 690
 691 /**
 692  * Function called once the hash computation over an
 693  * indexed file has completed.
 694  *
 695  * @param cls closure, our publishing context
 696  * @param res resulting hash, NULL on error
 697  */
 698 static void
 699 hash_for_index_cb (void *cls,
 700                    const GNUNET_HashCode *
 701                    res)
 702 {
 703   struct GNUNET_FS_PublishContext *sc = cls;
 704   struct GNUNET_FS_FileInformation *p;
 705   struct IndexStartMessage *ism;
 706   size_t slen;
 707   struct GNUNET_CLIENT_Connection *client;
 708   uint32_t dev;
 709   uint64_t ino;
 710   char *fn;
 711
 712   p = sc->fi_pos;
 713   if (NULL == res)
 714     {
 715       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 716                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 717                   p->data.file.filename,
 718                   _("failed to compute hash"));
 719       p->data.file.do_index = GNUNET_NO;
 720       publish_content (sc);
 721       return;
 722     }
 723   if (GNUNET_YES == p->data.file.index_start_confirmed)
 724     {
 725       publish_content (sc);
 726       return;
 727     }
 728   fn = GNUNET_STRINGS_filename_expand (p->data.file.filename);
 729   slen = strlen (fn) + 1;
 730   if (slen > GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof(struct IndexStartMessage))
 731     {
 732       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 733                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 734                   fn,
 735                   _("filename too long"));
 736       GNUNET_free (fn);
 737       p->data.file.do_index = GNUNET_NO;
 738       publish_content (sc);
 739       return;
 740     }
 741 #if DEBUG_PUBLISH
 742   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 743               "Hash of indexed file `%s' is `%s'\n",
 744               p->data.file.filename,
 745               GNUNET_h2s (res));
 746 #endif
 747   client = GNUNET_CLIENT_connect (sc->h->sched,
 748                                   "fs",
 749                                   sc->h->cfg);
 750   if (NULL == client)
 751     {
 752       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 753                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 754                   p->data.file.filename,
 755                   _("could not connect to `fs' service"));
 756       p->data.file.do_index = GNUNET_NO;
 757       publish_content (sc);
 758       GNUNET_free (fn);
 759       return;
 760     }
 761   p->data.file.file_id = *res;
 762   p->data.file.have_hash = GNUNET_YES;
 763   ism = GNUNET_malloc (sizeof(struct IndexStartMessage) +
 764                        slen);
 765   ism->header.size = htons(sizeof(struct IndexStartMessage) +
 766                            slen);
 767   ism->header.type = htons(GNUNET_MESSAGE_TYPE_FS_INDEX_START);
 768   if (GNUNET_OK ==
 769       GNUNET_DISK_file_get_identifiers (p->data.file.filename,
 770                                         &dev,
 771                                         &ino))
 772     {
 773       ism->device = htonl (dev);
 774       ism->inode = GNUNET_htonll(ino);
 775     }
 776   else
 777     {
 778       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 779                   _("Failed to get file identifiers for `%s'\n"),
 780                   p->data.file.filename);
 781     }
 782   ism->file_id = *res;
 783   memcpy (&ism[1],
 784           fn,
 785           slen);
 786   GNUNET_free (fn);
 787   sc->client = client;
 788   GNUNET_break (GNUNET_YES ==
 789                 GNUNET_CLIENT_transmit_and_get_response (client,
 790                                                          &ism->header,
 791                                                          GNUNET_TIME_UNIT_FOREVER_REL,
 792                                                          GNUNET_YES,
 793                                                          &process_index_start_response,
 794                                                          sc));
 795   GNUNET_free (ism);
 796 }
 797
 798
 799 /**
 800  * Main function that performs the upload.
 801  * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
 802  * @param tc task context
 803  */
 804 static void
 805 do_upload (void *cls,
 806            const struct GNUNET_SCHEDULER_TaskContext *tc)
 807 {
 808   struct GNUNET_FS_PublishContext *sc = cls;
 809   struct GNUNET_FS_ProgressInfo pi;
 810   struct GNUNET_FS_FileInformation *p;
 811   char *fn;
 812
 813   sc->upload_task = GNUNET_SCHEDULER_NO_TASK;
 814   p = sc->fi_pos;
 815   if (NULL == p)
 816     {
 817       /* upload of entire hierarchy complete,
 818          publish namespace entries */
 819       publish_sblock (sc);
 820       return;
 821     }
 822   /* find starting position */
 823   while ( (p->is_directory) &&
 824           (NULL != p->data.dir.entries) &&
 825           (NULL == p->emsg) &&
 826           (NULL == p->data.dir.entries->chk_uri) )
 827     {
 828       p = p->data.dir.entries;
 829       sc->fi_pos = p;
 830     }
 831   /* abort on error */
 832   if (NULL != p->emsg)
 833     {
 834       /* error with current file, abort all
 835          related files as well! */
 836       while (NULL != p->dir)
 837         {
 838           fn = GNUNET_CONTAINER_meta_data_get_by_type (p->meta,
 839                                                        EXTRACTOR_METATYPE_FILENAME);
 840           p = p->dir;
 841           if (fn != NULL)
 842             {
 843               GNUNET_asprintf (&p->emsg,
 844                                _("Recursive upload failed at `%s': %s"),
 845                                fn,
 846                                p->emsg);
 847               GNUNET_free (fn);
 848             }
 849           else
 850             {
 851               GNUNET_asprintf (&p->emsg,
 852                                _("Recursive upload failed: %s"),
 853                                p->emsg);
 854             }
 855           GNUNET_FS_file_information_sync (p);
 856           pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 857           make_publish_status (&pi, sc, p, 0);
 858           pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 859           pi.value.publish.specifics.error.message = p->emsg;
 860           p->client_info
 861             = sc->h->upcb (sc->h->upcb_cls,
 862                            &pi);
 863         }
 864       sc->all_done = GNUNET_YES;
 865       return;
 866     }
 867   /* handle completion */
 868   if (NULL != p->chk_uri)
 869     {
 870       /* upload of "p" complete, publish KBlocks! */
 871       if (p->keywords != NULL)
 872         {
 873           GNUNET_FS_publish_ksk (sc->h,
 874                                  p->keywords,
 875                                  p->meta,
 876                                  p->chk_uri,
 877                                  p->expirationTime,
 878                                  p->anonymity,
 879                                  p->priority,
 880                                  sc->options,
 881                                  &publish_kblocks_cont,
 882                                  sc);
 883         }
 884       else
 885         {
 886           publish_kblocks_cont (sc,
 887                                 p->chk_uri,
 888                                 NULL);
 889         }
 890       return;
 891     }
 892   if ( (!p->is_directory) &&
 893        (p->data.file.do_index) )
 894     {
 895       if (NULL == p->data.file.filename)
 896         {
 897           p->data.file.do_index = GNUNET_NO;
 898           GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 899                       _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 900                       "<no-name>",
 901                       _("needs to be an actual file"));
 902           publish_content (sc);
 903           return;
 904         }
 905       if (p->data.file.have_hash)
 906         hash_for_index_cb (sc,
 907                            &p->data.file.file_id);
 908       else
 909         {
 910           p->start_time = GNUNET_TIME_absolute_get ();
 911           GNUNET_CRYPTO_hash_file (sc->h->sched,
 912                                    GNUNET_SCHEDULER_PRIORITY_IDLE,
 913                                    p->data.file.filename,
 914                                    HASHING_BLOCKSIZE,
 915                                    &hash_for_index_cb,
 916                                    sc);
 917         }
 918       return;
 919     }
 920   publish_content (sc);
 921 }
 922
 923
 924 /**
 925  * Signal the FS's progress function that we are starting
 926  * an upload.
 927  *
 928  * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
 929  * @param fi the entry in the publish-structure
 930  * @param length length of the file or directory
 931  * @param meta metadata for the file or directory (can be modified)
 932  * @param uri pointer to the keywords that will be used for this entry (can be modified)
 933  * @param anonymity pointer to selected anonymity level (can be modified)
 934  * @param priority pointer to selected priority (can be modified)
 935  * @param expirationTime pointer to selected expiration time (can be modified)
 936  * @param client_info pointer to client context set upon creation (can be modified)
 937  * @return GNUNET_OK to continue (always)
 938  */
 939 static int
 940 fip_signal_start(void *cls,
 941                  struct GNUNET_FS_FileInformation *fi,
 942                  uint64_t length,
 943                  struct GNUNET_CONTAINER_MetaData *meta,
 944                  struct GNUNET_FS_Uri **uri,
 945                  uint32_t *anonymity,
 946                  uint32_t *priority,
 947                  struct GNUNET_TIME_Absolute *expirationTime,
 948                  void **client_info)
 949 {
 950   struct GNUNET_FS_PublishContext *sc = cls;
 951   struct GNUNET_FS_ProgressInfo pi;
 952
 953   pi.status = GNUNET_FS_STATUS_PUBLISH_START;
 954   make_publish_status (&pi, sc, fi, 0);
 955   *client_info = sc->h->upcb (sc->h->upcb_cls,
 956                               &pi);
 957   return GNUNET_OK;
 958 }
 959
 960
 961 /**
 962  * Publish a file or directory.
 963  *
 964  * @param h handle to the file sharing subsystem
 965  * @param fi information about the file or directory structure to publish
 966  * @param namespace namespace to publish the file in, NULL for no namespace
 967  * @param nid identifier to use for the publishd content in the namespace
 968  *        (can be NULL, must be NULL if namespace is NULL)
 969  * @param nuid update-identifier that will be used for future updates
 970  *        (can be NULL, must be NULL if namespace or nid is NULL)
 971  * @param options options for the publication
 972  * @return context that can be used to control the publish operation
 973  */
 974 struct GNUNET_FS_PublishContext *
 975 GNUNET_FS_publish_start (struct GNUNET_FS_Handle *h,
 976                          struct GNUNET_FS_FileInformation *fi,
 977                          struct GNUNET_FS_Namespace *namespace,
 978                          const char *nid,
 979                          const char *nuid,
 980                          enum GNUNET_FS_PublishOptions options)
 981 {
 982   struct GNUNET_FS_PublishContext *ret;
 983   struct GNUNET_DATASTORE_Handle *dsh;
 984
 985   if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
 986     {
 987       dsh = GNUNET_DATASTORE_connect (h->cfg,
 988                                       h->sched);
 989       if (NULL == dsh)
 990         return NULL;
 991     }
 992   else
 993     {
 994       dsh = NULL;
 995     }
 996   ret = GNUNET_malloc (sizeof (struct GNUNET_FS_PublishContext));
 997   ret->dsh = dsh;
 998   ret->h = h;
 999   ret->fi = fi;
1000   ret->namespace = namespace;
1001   if (namespace != NULL)
1002     {
1003       namespace->rc++;
1004       GNUNET_assert (NULL != nid);
1005       ret->nid = GNUNET_strdup (nid);
1006       if (NULL != nuid)
1007         ret->nuid = GNUNET_strdup (nuid);
1008     }
1009   // FIXME: make upload persistent!
1010
1011   /* signal start */
1012   GNUNET_FS_file_information_inspect (ret->fi,
1013                                       &fip_signal_start,
1014                                       ret);
1015   ret->fi_pos = ret->fi;
1016
1017   // FIXME: calculate space needed for "fi"
1018   // and reserve as first task (then trigger
1019   // "do_upload" from that continuation)!
1020   ret->upload_task
1021     = GNUNET_SCHEDULER_add_with_priority (h->sched,
1022                                     GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
1023                                     &do_upload,
1024                                     ret);
1025   return ret;
1026 }
1027
1028
1029 /**
1030  * Signal the FS's progress function that we are stopping
1031  * an upload.
1032  *
1033  * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
1034  * @param fi the entry in the publish-structure
1035  * @param length length of the file or directory
1036  * @param meta metadata for the file or directory (can be modified)
1037  * @param uri pointer to the keywords that will be used for this entry (can be modified)
1038  * @param anonymity pointer to selected anonymity level (can be modified)
1039  * @param priority pointer to selected priority (can be modified)
1040  * @param expirationTime pointer to selected expiration time (can be modified)
1041  * @param client_info pointer to client context set upon creation (can be modified)
1042  * @return GNUNET_OK to continue (always)
1043  */
1044 static int
1045 fip_signal_stop(void *cls,
1046                 struct GNUNET_FS_FileInformation *fi,
1047                 uint64_t length,
1048                 struct GNUNET_CONTAINER_MetaData *meta,
1049                 struct GNUNET_FS_Uri **uri,
1050                 uint32_t *anonymity,
1051                 uint32_t *priority,
1052                 struct GNUNET_TIME_Absolute *expirationTime,
1053                 void **client_info)
1054 {
1055   struct GNUNET_FS_PublishContext*sc = cls;
1056   struct GNUNET_FS_ProgressInfo pi;
1057   uint64_t off;
1058
1059   off = (fi->chk_uri == NULL) ? 0 : length;
1060   pi.status = GNUNET_FS_STATUS_PUBLISH_STOPPED;
1061   make_publish_status (&pi, sc, fi, off);
1062   GNUNET_break (NULL ==
1063                 sc->h->upcb (sc->h->upcb_cls,
1064                              &pi));
1065   *client_info = NULL;
1066   return GNUNET_OK;
1067 }
1068
1069
1070 /**
1071  * Stop an upload.  Will abort incomplete uploads (but
1072  * not remove blocks that have already been publishd) or
1073  * simply clean up the state for completed uploads.
1074  * Must NOT be called from within the event callback!
1075  *
1076  * @param sc context for the upload to stop
1077  */
1078 void
1079 GNUNET_FS_publish_stop (struct GNUNET_FS_PublishContext *sc)
1080 {
1081   if (GNUNET_SCHEDULER_NO_TASK != sc->upload_task)
1082     GNUNET_SCHEDULER_cancel (sc->h->sched, sc->upload_task);
1083   else
1084     GNUNET_assert (sc->all_done == GNUNET_YES);
1085   // FIXME: remove from persistence DB (?) --- think more about
1086   //        shutdown / persistent-resume APIs!!!
1087   GNUNET_FS_file_information_inspect (sc->fi,
1088                                       &fip_signal_stop,
1089                                       sc);
1090   if (GNUNET_YES == sc->in_network_wait)
1091     {
1092       sc->in_network_wait = GNUNET_SYSERR;
1093       return;
1094     }
1095   publish_cleanup (sc);
1096 }
1097
1098
1099 /**
1100  * Context for the KSK publication.
1101  */
1102 struct PublishKskContext
1103 {
1104
1105   /**
1106    * Keywords to use.
1107    */
1108   struct GNUNET_FS_Uri *ksk_uri;
1109
1110   /**
1111    * Global FS context.
1112    */
1113   struct GNUNET_FS_Handle *h;
1114
1115   /**
1116    * The master block that we are sending
1117    * (in plaintext), has "mdsize+slen" more
1118    * bytes than the struct would suggest.
1119    */
1120   struct KBlock *kb;
1121
1122   /**
1123    * Buffer of the same size as "kb" for
1124    * the encrypted version.
1125    */
1126   struct KBlock *cpy;
1127
1128   /**
1129    * Handle to the datastore, NULL if we are just
1130    * simulating.
1131    */
1132   struct GNUNET_DATASTORE_Handle *dsh;
1133
1134   /**
1135    * Function to call once we're done.
1136    */
1137   GNUNET_FS_PublishContinuation cont;
1138
1139   /**
1140    * Closure for cont.
1141    */
1142   void *cont_cls;
1143
1144   /**
1145    * When should the KBlocks expire?
1146    */
1147   struct GNUNET_TIME_Absolute expirationTime;
1148
1149   /**
1150    * Size of the serialized metadata.
1151    */
1152   ssize_t mdsize;
1153
1154   /**
1155    * Size of the (CHK) URI as a string.
1156    */
1157   size_t slen;
1158
1159   /**
1160    * Keyword that we are currently processing.
1161    */
1162   unsigned int i;
1163
1164   /**
1165    * Anonymity level for the KBlocks.
1166    */
1167   uint32_t anonymity;
1168
1169   /**
1170    * Priority for the KBlocks.
1171    */
1172   uint32_t priority;
1173 };
1174
1175
1176 /**
1177  * Continuation of "GNUNET_FS_publish_ksk" that performs
1178  * the actual publishing operation (iterating over all
1179  * of the keywords).
1180  *
1181  * @param cls closure of type "struct PublishKskContext*"
1182  * @param tc unused
1183  */
1184 static void
1185 publish_ksk_cont (void *cls,
1186                   const struct GNUNET_SCHEDULER_TaskContext *tc);
1187
1188
1189 /**
1190  * Function called by the datastore API with
1191  * the result from the PUT request.
1192  *
1193  * @param cls closure of type "struct PublishKskContext*"
1194  * @param success GNUNET_OK on success
1195  * @param msg error message (or NULL)
1196  */
1197 static void
1198 kb_put_cont (void *cls,
1199              int success,
1200              const char *msg)
1201 {
1202   struct PublishKskContext *pkc = cls;
1203
1204   if (GNUNET_OK != success)
1205     {
1206       GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1207       GNUNET_free (pkc->cpy);
1208       GNUNET_free (pkc->kb);
1209       pkc->cont (pkc->cont_cls,
1210                  NULL,
1211                  msg);
1212       GNUNET_FS_uri_destroy (pkc->ksk_uri);
1213       GNUNET_free (pkc);
1214       return;
1215     }
1216   GNUNET_SCHEDULER_add_continuation (pkc->h->sched,
1217                                      &publish_ksk_cont,
1218                                      pkc,
1219                                      GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1220 }
1221
1222
1223 /**
1224  * Continuation of "GNUNET_FS_publish_ksk" that performs the actual
1225  * publishing operation (iterating over all of the keywords).
1226  *
1227  * @param cls closure of type "struct PublishKskContext*"
1228  * @param tc unused
1229  */
1230 static void
1231 publish_ksk_cont (void *cls,
1232                   const struct GNUNET_SCHEDULER_TaskContext *tc)
1233 {
1234   struct PublishKskContext *pkc = cls;
1235   const char *keyword;
1236   GNUNET_HashCode key;
1237   GNUNET_HashCode query;
1238   struct GNUNET_CRYPTO_AesSessionKey skey;
1239   struct GNUNET_CRYPTO_AesInitializationVector iv;
1240   struct GNUNET_CRYPTO_RsaPrivateKey *pk;
1241
1242
1243   if ( (pkc->i == pkc->ksk_uri->data.ksk.keywordCount) ||
1244        (NULL == pkc->dsh) )
1245     {
1246       if (NULL != pkc->dsh)
1247         GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1248       GNUNET_free (pkc->cpy);
1249       GNUNET_free (pkc->kb);
1250       pkc->cont (pkc->cont_cls,
1251                  pkc->ksk_uri,
1252                  NULL);
1253       GNUNET_FS_uri_destroy (pkc->ksk_uri);
1254       GNUNET_free (pkc);
1255       return;
1256     }
1257   keyword = pkc->ksk_uri->data.ksk.keywords[pkc->i++];
1258   /* first character of keyword indicates if it is
1259      mandatory or not -- ignore for hashing */
1260   GNUNET_CRYPTO_hash (&keyword[1], strlen (&keyword[1]), &key);
1261   GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
1262   GNUNET_CRYPTO_aes_encrypt (&pkc->kb[1],
1263                              pkc->slen + pkc->mdsize,
1264                              &skey,
1265                              &iv,
1266                              &pkc->cpy[1]);
1267   pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&key);
1268   GNUNET_CRYPTO_rsa_key_get_public (pk, &pkc->cpy->keyspace);
1269   GNUNET_CRYPTO_hash (&pkc->cpy->keyspace,
1270                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1271                       &query);
1272   GNUNET_assert (GNUNET_OK ==
1273                  GNUNET_CRYPTO_rsa_sign (pk,
1274                                          &pkc->cpy->purpose,
1275                                          &pkc->cpy->signature));
1276   GNUNET_CRYPTO_rsa_key_free (pk);
1277   GNUNET_DATASTORE_put (pkc->dsh,
1278                         0,
1279                         &query,
1280                         pkc->mdsize +
1281                         sizeof (struct KBlock) +
1282                         pkc->slen,
1283                         pkc->cpy,
1284                         GNUNET_DATASTORE_BLOCKTYPE_KBLOCK,
1285                         pkc->priority,
1286                         pkc->anonymity,
1287                         pkc->expirationTime,
1288                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1289                         &kb_put_cont,
1290                         pkc);
1291 }
1292
1293
1294 /**
1295  * Publish a CHK under various keywords on GNUnet.
1296  *
1297  * @param h handle to the file sharing subsystem
1298  * @param ksk_uri keywords to use
1299  * @param meta metadata to use
1300  * @param uri URI to refer to in the KBlock
1301  * @param expirationTime when the KBlock expires
1302  * @param anonymity anonymity level for the KBlock
1303  * @param priority priority for the KBlock
1304  * @param options publication options
1305  * @param cont continuation
1306  * @param cont_cls closure for cont
1307  */
1308 void
1309 GNUNET_FS_publish_ksk (struct GNUNET_FS_Handle *h,
1310                        const struct GNUNET_FS_Uri *ksk_uri,
1311                        const struct GNUNET_CONTAINER_MetaData *meta,
1312                        const struct GNUNET_FS_Uri *uri,
1313                        struct GNUNET_TIME_Absolute expirationTime,
1314                        uint32_t anonymity,
1315                        uint32_t priority,
1316                        enum GNUNET_FS_PublishOptions options,
1317                        GNUNET_FS_PublishContinuation cont,
1318                        void *cont_cls)
1319 {
1320   struct PublishKskContext *pkc;
1321   char *uris;
1322   size_t size;
1323   char *kbe;
1324   char *sptr;
1325
1326   pkc = GNUNET_malloc (sizeof (struct PublishKskContext));
1327   pkc->h = h;
1328   pkc->expirationTime = expirationTime;
1329   pkc->anonymity = anonymity;
1330   pkc->priority = priority;
1331   pkc->cont = cont;
1332   pkc->cont_cls = cont_cls;
1333   if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
1334     {
1335       pkc->dsh = GNUNET_DATASTORE_connect (h->cfg,
1336                                            h->sched);
1337       if (pkc->dsh == NULL)
1338         {
1339           cont (cont_cls, NULL, _("Could not connect to datastore."));
1340           GNUNET_free (pkc);
1341           return;
1342         }
1343     }
1344   if (meta == NULL)
1345     pkc->mdsize = 0;
1346   else
1347     pkc->mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta);
1348   GNUNET_assert (pkc->mdsize >= 0);
1349   uris = GNUNET_FS_uri_to_string (uri);
1350   pkc->slen = strlen (uris) + 1;
1351   size = pkc->mdsize + sizeof (struct KBlock) + pkc->slen;
1352   if (size > MAX_KBLOCK_SIZE)
1353     {
1354       size = MAX_KBLOCK_SIZE;
1355       pkc->mdsize = size - sizeof (struct KBlock) - pkc->slen;
1356     }
1357   pkc->kb = GNUNET_malloc (size);
1358   kbe = (char *) &pkc->kb[1];
1359   memcpy (kbe, uris, pkc->slen);
1360   GNUNET_free (uris);
1361   sptr = &kbe[pkc->slen];
1362   if (meta != NULL)
1363     pkc->mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
1364                                                         &sptr,
1365                                                         pkc->mdsize,
1366                                                         GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1367   if (pkc->mdsize == -1)
1368     {
1369       GNUNET_break (0);
1370       GNUNET_free (pkc->kb);
1371       if (pkc->dsh != NULL)
1372         GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1373       cont (cont_cls, NULL, _("Internal error."));
1374       GNUNET_free (pkc);
1375       return;
1376     }
1377   size = sizeof (struct KBlock) + pkc->slen + pkc->mdsize;
1378
1379   pkc->cpy = GNUNET_malloc (size);
1380   pkc->cpy->purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1381                                   sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1382                                   pkc->mdsize +
1383                                   pkc->slen);
1384   pkc->cpy->purpose.purpose = htonl(GNUNET_SIGNATURE_PURPOSE_FS_KBLOCK);
1385   pkc->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
1386   GNUNET_SCHEDULER_add_continuation (h->sched,
1387                                      &publish_ksk_cont,
1388                                      pkc,
1389                                      GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1390 }
1391
1392
1393 /**
1394  * Context for the SKS publication.
1395  */
1396 struct PublishSksContext
1397 {
1398
1399   /**
1400    * Global FS context.
1401    */
1402   struct GNUNET_FS_Uri *uri;
1403
1404   /**
1405    * Handle to the datastore.
1406    */
1407   struct GNUNET_DATASTORE_Handle *dsh;
1408
1409   /**
1410    * Function to call once we're done.
1411    */
1412   GNUNET_FS_PublishContinuation cont;
1413
1414   /**
1415    * Closure for cont.
1416    */
1417   void *cont_cls;
1418
1419 };
1420
1421
1422 /**
1423  * Function called by the datastore API with
1424  * the result from the PUT (SBlock) request.
1425  *
1426  * @param cls closure of type "struct PublishSksContext*"
1427  * @param success GNUNET_OK on success
1428  * @param msg error message (or NULL)
1429  */
1430 static void
1431 sb_put_cont (void *cls,
1432              int success,
1433              const char *msg)
1434 {
1435   struct PublishSksContext *psc = cls;
1436
1437   if (NULL != psc->dsh)
1438     GNUNET_DATASTORE_disconnect (psc->dsh, GNUNET_NO);
1439   if (GNUNET_OK != success)
1440     psc->cont (psc->cont_cls,
1441                NULL,
1442                msg);
1443   else
1444     psc->cont (psc->cont_cls,
1445                psc->uri,
1446                NULL);
1447   GNUNET_FS_uri_destroy (psc->uri);
1448   GNUNET_free (psc);
1449 }
1450
1451
1452 /**
1453  * Publish an SBlock on GNUnet.
1454  *
1455  * @param h handle to the file sharing subsystem
1456  * @param namespace namespace to publish in
1457  * @param identifier identifier to use
1458  * @param update update identifier to use
1459  * @param meta metadata to use
1460  * @param uri URI to refer to in the SBlock
1461  * @param expirationTime when the SBlock expires
1462  * @param anonymity anonymity level for the SBlock
1463  * @param priority priority for the SBlock
1464  * @param options publication options
1465  * @param cont continuation
1466  * @param cont_cls closure for cont
1467  */
1468 void
1469 GNUNET_FS_publish_sks (struct GNUNET_FS_Handle *h,
1470                        struct GNUNET_FS_Namespace *namespace,
1471                        const char *identifier,
1472                        const char *update,
1473                        const struct GNUNET_CONTAINER_MetaData *meta,
1474                        const struct GNUNET_FS_Uri *uri,
1475                        struct GNUNET_TIME_Absolute expirationTime,
1476                        uint32_t anonymity,
1477                        uint32_t priority,
1478                        enum GNUNET_FS_PublishOptions options,
1479                        GNUNET_FS_PublishContinuation cont,
1480                        void *cont_cls)
1481 {
1482   struct PublishSksContext *psc;
1483   struct GNUNET_CRYPTO_AesSessionKey sk;
1484   struct GNUNET_CRYPTO_AesInitializationVector iv;
1485   struct GNUNET_FS_Uri *sks_uri;
1486   char *uris;
1487   size_t size;
1488   size_t slen;
1489   size_t nidlen;
1490   size_t idlen;
1491   ssize_t mdsize;
1492   struct SBlock *sb;
1493   struct SBlock *sb_enc;
1494   char *dest;
1495   struct GNUNET_CONTAINER_MetaData *mmeta;
1496   GNUNET_HashCode key;         /* hash of thisId = key */
1497   GNUNET_HashCode id;          /* hash of hc = identifier */
1498   GNUNET_HashCode query;       /* id ^ nsid = DB query */
1499
1500   if (NULL == meta)
1501     mmeta = GNUNET_CONTAINER_meta_data_create ();
1502   else
1503     mmeta = GNUNET_CONTAINER_meta_data_duplicate (meta);
1504   uris = GNUNET_FS_uri_to_string (uri);
1505   slen = strlen (uris) + 1;
1506   idlen = strlen (identifier);
1507   if (update == NULL)
1508     update = "";
1509   nidlen = strlen (update) + 1;
1510   mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (mmeta);
1511   size = sizeof (struct SBlock) + slen + nidlen + mdsize;
1512   if (size > MAX_SBLOCK_SIZE)
1513     {
1514       size = MAX_SBLOCK_SIZE;
1515       mdsize = size - (sizeof (struct SBlock) + slen + nidlen);
1516     }
1517   sb = GNUNET_malloc (sizeof (struct SBlock) + size);
1518   dest = (char *) &sb[1];
1519   memcpy (dest, update, nidlen);
1520   dest += nidlen;
1521   memcpy (dest, uris, slen);
1522   dest += slen;
1523   mdsize = GNUNET_CONTAINER_meta_data_serialize (mmeta,
1524                                                  &dest,
1525                                                  mdsize,
1526                                                  GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1527   GNUNET_CONTAINER_meta_data_destroy (mmeta);
1528   if (mdsize == -1)
1529     {
1530       GNUNET_break (0);
1531       GNUNET_free (uris);
1532       GNUNET_free (sb);
1533       cont (cont_cls,
1534             NULL,
1535             _("Internal error."));
1536       return;
1537     }
1538   size = sizeof (struct SBlock) + mdsize + slen + nidlen;
1539   sb_enc = GNUNET_malloc (size);
1540   GNUNET_CRYPTO_hash (identifier, idlen, &key);
1541   GNUNET_CRYPTO_hash (&key, sizeof (GNUNET_HashCode), &id);
1542   sks_uri = GNUNET_malloc (sizeof (struct GNUNET_FS_Uri));
1543   sks_uri->type = sks;
1544   GNUNET_CRYPTO_rsa_key_get_public (namespace->key, &sb_enc->subspace);
1545   GNUNET_CRYPTO_hash (&sb_enc->subspace,
1546                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1547                       &sks_uri->data.sks.namespace);
1548   sks_uri->data.sks.identifier = GNUNET_strdup (identifier);
1549   GNUNET_CRYPTO_hash_xor (&id,
1550                           &sks_uri->data.sks.namespace,
1551                           &sb_enc->identifier);
1552   GNUNET_CRYPTO_hash_to_aes_key (&key, &sk, &iv);
1553   GNUNET_CRYPTO_aes_encrypt (&sb[1],
1554                              size - sizeof (struct SBlock),
1555                              &sk,
1556                              &iv,
1557                              &sb_enc[1]);
1558   sb_enc->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_SBLOCK);
1559   sb_enc->purpose.size = htonl(slen + mdsize + nidlen
1560                                + sizeof(struct SBlock)
1561                                - sizeof(struct GNUNET_CRYPTO_RsaSignature));
1562   GNUNET_assert (GNUNET_OK ==
1563                  GNUNET_CRYPTO_rsa_sign (namespace->key,
1564                                          &sb_enc->purpose,
1565                                          &sb_enc->signature));
1566   psc = GNUNET_malloc (sizeof(struct PublishSksContext));
1567   psc->uri = sks_uri;
1568   psc->cont = cont;
1569   psc->cont_cls = cont_cls;
1570   if (0 != (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
1571     {
1572       GNUNET_free (sb_enc);
1573       GNUNET_free (sb);
1574       sb_put_cont (psc,
1575                    GNUNET_OK,
1576                    NULL);
1577       return;
1578     }
1579   psc->dsh = GNUNET_DATASTORE_connect (h->cfg, h->sched);
1580   if (NULL == psc->dsh)
1581     {
1582       GNUNET_free (sb_enc);
1583       GNUNET_free (sb);
1584       sb_put_cont (psc,
1585                    GNUNET_NO,
1586                    _("Failed to connect to datastore."));
1587       return;
1588     }
1589   GNUNET_CRYPTO_hash_xor (&sks_uri->data.sks.namespace,
1590                           &id,
1591                           &query);
1592   GNUNET_DATASTORE_put (psc->dsh,
1593                         0,
1594                         &sb_enc->identifier,
1595                         size,
1596                         sb_enc,
1597                         GNUNET_DATASTORE_BLOCKTYPE_SBLOCK,
1598                         priority,
1599                         anonymity,
1600                         expirationTime,
1601                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1602                         &sb_put_cont,
1603                         psc);
1604
1605   GNUNET_free (sb);
1606   GNUNET_free (sb_enc);
1607 }
1608
1609 /* end of fs_publish.c */