src/fs/fs_publish.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009 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  * Maximum allowed size for a KBlock.
  47  */
  48 #define MAX_KBLOCK_SIZE 60000
  49
  50 /**
  51  * Maximum allowed size for an SBlock.
  52  */
  53 #define MAX_SBLOCK_SIZE 60000
  54
  55 /**
  56  * Main function that performs the upload.
  57  * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
  58  * @param tc task context
  59  */
  60 static void
  61 do_upload (void *cls,
  62            const struct GNUNET_SCHEDULER_TaskContext *tc);
  63
  64
  65 /**
  66  * Context for "ds_put_cont".
  67  */
  68 struct PutContCtx
  69 {
  70   /**
  71    * Current publishing context.
  72    */
  73   struct GNUNET_FS_PublishContext *sc;
  74
  75   /**
  76    * Specific file with the block.
  77    */
  78   struct GNUNET_FS_FileInformation *p;
  79
  80   /**
  81    * Function to run next, if any (can be NULL).
  82    */
  83   GNUNET_SCHEDULER_Task cont;
  84
  85   /**
  86    * Closure for cont.
  87    */
  88   void *cont_cls;
  89 };
  90
  91
  92 /**
  93  * Fill in all of the generic fields for
  94  * a publish event.
  95  *
  96  * @param pi structure to fill in
  97  * @param sc overall publishing context
  98  * @param p file information for the file being published
  99  * @param offset where in the file are we so far
 100  */
 101 static void
 102 make_publish_status (struct GNUNET_FS_ProgressInfo *pi,
 103                      struct GNUNET_FS_PublishContext *sc,
 104                      const struct GNUNET_FS_FileInformation *p,
 105                      uint64_t offset)
 106 {
 107   pi->value.publish.sc = sc;
 108   pi->value.publish.fi = p;
 109   pi->value.publish.cctx
 110     = p->client_info;
 111   pi->value.publish.pctx
 112     = (NULL == p->dir) ? NULL : p->dir->client_info;
 113   pi->value.publish.filename
 114     = (p->is_directory) ? p->data.dir.dirname : p->data.file.filename;
 115   pi->value.publish.size
 116     = (p->is_directory) ? p->data.dir.dir_size : p->data.file.file_size;
 117   pi->value.publish.eta
 118     = GNUNET_TIME_calculate_eta (p->start_time,
 119                                  offset,
 120                                  pi->value.publish.size);
 121   pi->value.publish.completed = offset;
 122   pi->value.publish.duration = GNUNET_TIME_absolute_get_duration (p->start_time);
 123   pi->value.publish.anonymity = p->anonymity;
 124 }
 125
 126
 127 /**
 128  * Cleanup the publish context, we're done
 129  * with it.
 130  *
 131  * @param sc struct to clean up after
 132  */
 133 static void
 134 publish_cleanup (struct GNUNET_FS_PublishContext *sc)
 135 {
 136   GNUNET_FS_file_information_destroy (sc->fi, NULL, NULL);
 137   if (sc->namespace != NULL)
 138     GNUNET_FS_namespace_delete (sc->namespace, GNUNET_NO);
 139   GNUNET_free_non_null (sc->nid);
 140   GNUNET_free_non_null (sc->nuid);
 141   GNUNET_DATASTORE_disconnect (sc->dsh, GNUNET_NO);
 142   GNUNET_free (sc);
 143 }
 144
 145
 146 /**
 147  * Function called by the datastore API with
 148  * the result from the PUT request.
 149  *
 150  * @param cls our closure
 151  * @param success GNUNET_OK on success
 152  * @param msg error message (or NULL)
 153  */
 154 static void
 155 ds_put_cont (void *cls,
 156              int success,
 157              const char *msg)
 158 {
 159   struct PutContCtx *pcc = cls;
 160   struct GNUNET_FS_ProgressInfo pi;
 161
 162   if (GNUNET_SYSERR == pcc->sc->in_network_wait)
 163     {
 164       /* we were aborted in the meantime,
 165          finish shutdown! */
 166       publish_cleanup (pcc->sc);
 167       return;
 168     }
 169   GNUNET_assert (GNUNET_YES == pcc->sc->in_network_wait);
 170   pcc->sc->in_network_wait = GNUNET_NO;
 171   if (GNUNET_OK != success)
 172     {
 173       GNUNET_asprintf (&pcc->p->emsg,
 174                        _("Upload failed: %s"),
 175                        msg);
 176       GNUNET_FS_file_information_sync (pcc->p);
 177       pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 178       make_publish_status (&pi, pcc->sc, pcc->p, 0);
 179       pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 180       pi.value.publish.specifics.error.message = pcc->p->emsg;
 181       pcc->p->client_info
 182         = pcc->sc->h->upcb (pcc->sc->h->upcb_cls,
 183                             &pi);
 184     }
 185   GNUNET_FS_file_information_sync (pcc->p);
 186   if (NULL != pcc->cont)
 187     pcc->sc->upload_task
 188       = GNUNET_SCHEDULER_add_delayed (pcc->sc->h->sched,
 189                                       GNUNET_NO,
 190                                       GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 191                                       GNUNET_SCHEDULER_NO_TASK,
 192                                       GNUNET_TIME_UNIT_ZERO,
 193                                       pcc->cont,
 194                                       pcc->cont_cls);
 195   GNUNET_free (pcc);
 196 }
 197
 198
 199 /**
 200  * Generate the callback that signals clients
 201  * that a file (or directory) has been completely
 202  * published.
 203  *
 204  * @param p the completed upload
 205  * @param sc context of the publication
 206  */
 207 static void
 208 signal_publish_completion (struct GNUNET_FS_FileInformation *p,
 209                            struct GNUNET_FS_PublishContext *sc)
 210 {
 211   struct GNUNET_FS_ProgressInfo pi;
 212
 213   pi.status = GNUNET_FS_STATUS_PUBLISH_COMPLETED;
 214   make_publish_status (&pi, sc, p,
 215                        GNUNET_ntohll (p->chk_uri->data.chk.file_length));
 216   pi.value.publish.eta = GNUNET_TIME_UNIT_ZERO;
 217   pi.value.publish.specifics.completed.chk_uri = p->chk_uri;
 218   p->client_info
 219     = sc->h->upcb (sc->h->upcb_cls,
 220                   &pi);
 221 }
 222
 223
 224 /**
 225  * Generate the callback that signals clients
 226  * that a file (or directory) has encountered
 227  * a problem during publication.
 228  *
 229  * @param p the upload that had trouble
 230  * @param sc context of the publication
 231  * @param emsg error message
 232  */
 233 static void
 234 signal_publish_error (struct GNUNET_FS_FileInformation *p,
 235                       struct GNUNET_FS_PublishContext *sc,
 236                       const char *emsg)
 237 {
 238   struct GNUNET_FS_ProgressInfo pi;
 239
 240   p->emsg = GNUNET_strdup (emsg);
 241   pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 242   make_publish_status (&pi, sc, p, 0);
 243   pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 244   pi.value.publish.specifics.error.message =emsg;
 245   p->client_info
 246     = sc->h->upcb (sc->h->upcb_cls,
 247                   &pi);
 248 }
 249
 250
 251 /**
 252  * We've finished publishing the SBlock as part of a larger upload.
 253  * Check the result and complete the larger upload.
 254  *
 255  * @param cls the "struct GNUNET_FS_PublishContext*" of the larger upload
 256  * @param uri URI of the published SBlock
 257  * @param emsg NULL on success, otherwise error message
 258  */
 259 static void
 260 publish_sblocks_cont (void *cls,
 261                       const struct GNUNET_FS_Uri *uri,
 262                       const char *emsg)
 263 {
 264   struct GNUNET_FS_PublishContext *sc = cls;
 265   if (NULL != emsg)
 266     {
 267       signal_publish_error (sc->fi,
 268                             sc,
 269                             emsg);
 270       return;
 271     }
 272   // FIXME: release the datastore reserve here!
 273   signal_publish_completion (sc->fi, sc);
 274   sc->all_done = GNUNET_YES;
 275 }
 276
 277
 278 /**
 279  * We are almost done publishing the structure,
 280  * add SBlocks (if needed).
 281  *
 282  * @param sc overall upload data
 283  */
 284 static void
 285 publish_sblock (struct GNUNET_FS_PublishContext *sc)
 286 {
 287   if (NULL != sc->namespace)
 288     GNUNET_FS_publish_sks (sc->h,
 289                            sc->namespace,
 290                            sc->nid,
 291                            sc->nuid,
 292                            sc->fi->meta,
 293                            sc->fi->chk_uri,
 294                            sc->fi->expirationTime,
 295                            sc->fi->anonymity,
 296                            sc->fi->priority,
 297                            sc->options,
 298                            &publish_sblocks_cont,
 299                            sc);
 300   else
 301     publish_sblocks_cont (sc, NULL, NULL);
 302 }
 303
 304
 305 /**
 306  * We've finished publishing a KBlock
 307  * as part of a larger upload.  Check
 308  * the result and continue the larger
 309  * upload.
 310  *
 311  * @param cls the "struct GNUNET_FS_PublishContext*"
 312  *        of the larger upload
 313  * @param uri URI of the published blocks
 314  * @param emsg NULL on success, otherwise error message
 315  */
 316 static void
 317 publish_kblocks_cont (void *cls,
 318                       const struct GNUNET_FS_Uri *uri,
 319                       const char *emsg)
 320 {
 321   struct GNUNET_FS_PublishContext *sc = cls;
 322   struct GNUNET_FS_FileInformation *p = sc->fi_pos;
 323
 324   if (NULL != emsg)
 325     {
 326       signal_publish_error (p, sc, emsg);
 327       sc->upload_task
 328         = GNUNET_SCHEDULER_add_delayed (sc->h->sched,
 329                                         GNUNET_NO,
 330                                         GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 331                                         GNUNET_SCHEDULER_NO_TASK,
 332                                         GNUNET_TIME_UNIT_ZERO,
 333                                         &do_upload,
 334                                         sc);
 335       return;
 336     }
 337   GNUNET_FS_file_information_sync (p);
 338   if (NULL != p->dir)
 339     signal_publish_completion (p, sc);
 340   /* move on to next file */
 341   if (NULL != p->next)
 342     sc->fi_pos = p->next;
 343   else
 344     sc->fi_pos = p->dir;
 345   sc->upload_task
 346     = GNUNET_SCHEDULER_add_delayed (sc->h->sched,
 347                                     GNUNET_NO,
 348                                     GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 349                                     GNUNET_SCHEDULER_NO_TASK,
 350                                     GNUNET_TIME_UNIT_ZERO,
 351                                     &do_upload,
 352                                     sc);
 353 }
 354
 355
 356 /**
 357  * Function called by the tree encoder to obtain
 358  * a block of plaintext data (for the lowest level
 359  * of the tree).
 360  *
 361  * @param cls our publishing context
 362  * @param offset identifies which block to get
 363  * @param max (maximum) number of bytes to get; returning
 364  *        fewer will also cause errors
 365  * @param buf where to copy the plaintext buffer
 366  * @param emsg location to store an error message (on error)
 367  * @return number of bytes copied to buf, 0 on error
 368  */
 369 static size_t
 370 block_reader (void *cls,
 371               uint64_t offset,
 372               size_t max,
 373               void *buf,
 374               char **emsg)
 375 {
 376   struct GNUNET_FS_PublishContext *sc = cls;
 377   struct GNUNET_FS_FileInformation *p;
 378   size_t pt_size;
 379   const char *dd;
 380
 381   p = sc->fi_pos;
 382   if (p->is_directory)
 383     {
 384       pt_size = GNUNET_MIN(max,
 385                            p->data.dir.dir_size - offset);
 386       dd = p->data.dir.dir_data;
 387       memcpy (&buf,
 388               &dd[offset],
 389               pt_size);
 390     }
 391   else
 392     {
 393       pt_size = GNUNET_MIN(max,
 394                            p->data.file.file_size - offset);
 395       if (pt_size == 0)
 396         return 0; /* calling reader with pt_size==0
 397                      might free buf, so don't! */
 398       if (pt_size !=
 399           p->data.file.reader (p->data.file.reader_cls,
 400                                offset,
 401                                pt_size,
 402                                buf,
 403                                emsg))
 404         return 0;
 405     }
 406   return pt_size;
 407 }
 408
 409
 410 /**
 411  * The tree encoder has finished processing a
 412  * file.   Call it's finish method and deal with
 413  * the final result.
 414  *
 415  * @param cls our publishing context
 416  * @param tc scheduler's task context (not used)
 417  */
 418 static void
 419 encode_cont (void *cls,
 420              const struct GNUNET_SCHEDULER_TaskContext *tc)
 421 {
 422   struct GNUNET_FS_PublishContext *sc = cls;
 423   struct GNUNET_FS_FileInformation *p;
 424   struct GNUNET_FS_ProgressInfo pi;
 425   char *emsg;
 426
 427   p = sc->fi_pos;
 428   GNUNET_FS_tree_encoder_finish (p->te,
 429                                  &p->chk_uri,
 430                                  &emsg);
 431   p->te = NULL;
 432   if (NULL != emsg)
 433     {
 434       GNUNET_asprintf (&p->emsg,
 435                        _("Upload failed: %s"),
 436                        emsg);
 437       GNUNET_free (emsg);
 438       GNUNET_FS_file_information_sync (p);
 439       pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 440       make_publish_status (&pi, sc, p, 0);
 441       pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 442       pi.value.publish.specifics.error.message = p->emsg;
 443       p->client_info
 444         = sc->h->upcb (sc->h->upcb_cls,
 445                        &pi);
 446     }
 447   /* continue with main */
 448   sc->upload_task
 449     = GNUNET_SCHEDULER_add_delayed (sc->h->sched,
 450                                     GNUNET_NO,
 451                                     GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 452                                     GNUNET_SCHEDULER_NO_TASK,
 453                                     GNUNET_TIME_UNIT_ZERO,
 454                                     &do_upload,
 455                                     sc);
 456 }
 457
 458
 459 /**
 460  * Function called asking for the current (encoded)
 461  * block to be processed.  After processing the
 462  * client should either call "GNUNET_FS_tree_encode_next"
 463  * or (on error) "GNUNET_FS_tree_encode_finish".
 464  *
 465  * @param cls closure
 466  * @param query the query for the block (key for lookup in the datastore)
 467  * @param offset offset of the block in the file
 468  * @param type type of the block (IBLOCK or DBLOCK)
 469  * @param block the (encrypted) block
 470  * @param block_size size of block (in bytes)
 471  */
 472 static void
 473 block_proc (void *cls,
 474             const GNUNET_HashCode *query,
 475             uint64_t offset,
 476             uint32_t type,
 477             const void *block,
 478             uint16_t block_size)
 479 {
 480   struct GNUNET_FS_PublishContext *sc = cls;
 481   struct GNUNET_FS_FileInformation *p;
 482   struct PutContCtx * dpc_cls;
 483   struct OnDemandBlock odb;
 484
 485 #if DEBUG_PUBLISH
 486   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 487               "Publishing block `%s' for offset %llu with size %u\n",
 488               GNUNET_h2s (query),
 489               (unsigned long long) offset,
 490               (unsigned int) block_size);
 491 #endif
 492   p = sc->fi_pos;
 493   if (NULL == sc->dsh)
 494     {
 495       sc->upload_task
 496         = GNUNET_SCHEDULER_add_delayed (sc->h->sched,
 497                                         GNUNET_NO,
 498                                         GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 499                                         GNUNET_SCHEDULER_NO_TASK,
 500                                         GNUNET_TIME_UNIT_ZERO,
 501                                         &do_upload,
 502                                         sc);
 503       return;
 504     }
 505
 506   GNUNET_assert (GNUNET_NO == sc->in_network_wait);
 507   sc->in_network_wait = GNUNET_YES;
 508   dpc_cls = GNUNET_malloc(sizeof(struct PutContCtx));
 509   dpc_cls->cont = &do_upload;
 510   dpc_cls->cont_cls = sc;
 511   dpc_cls->sc = sc;
 512   dpc_cls->p = p;
 513   if ( (p->is_directory) &&
 514        (p->data.file.do_index) &&
 515        (type == GNUNET_DATASTORE_BLOCKTYPE_DBLOCK) )
 516     {
 517       odb.offset = offset;
 518       odb.file_id = p->data.file.file_id;
 519       GNUNET_DATASTORE_put (sc->dsh,
 520                             sc->rid,
 521                             query,
 522                             sizeof(struct OnDemandBlock),
 523                             &odb,
 524                             GNUNET_DATASTORE_BLOCKTYPE_ONDEMAND,
 525                             p->priority,
 526                             p->anonymity,
 527                             p->expirationTime,
 528                             GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 529                             &ds_put_cont,
 530                             dpc_cls);
 531       return;
 532     }
 533   GNUNET_DATASTORE_put (sc->dsh,
 534                         sc->rid,
 535                         query,
 536                         block_size,
 537                         block,
 538                         type,
 539                         p->priority,
 540                         p->anonymity,
 541                         p->expirationTime,
 542                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 543                         &ds_put_cont,
 544                         dpc_cls);
 545 }
 546
 547
 548 /**
 549  * Function called with information about our
 550  * progress in computing the tree encoding.
 551  *
 552  * @param cls closure
 553  * @param offset where are we in the file
 554  * @param pt_block plaintext of the currently processed block
 555  * @param pt_size size of pt_block
 556  * @param depth depth of the block in the tree
 557  */
 558 static void
 559 progress_proc (void *cls,
 560                uint64_t offset,
 561                const void *pt_block,
 562                size_t pt_size,
 563                unsigned int depth)
 564 {
 565   struct GNUNET_FS_PublishContext *sc = cls;
 566   struct GNUNET_FS_FileInformation *p;
 567   struct GNUNET_FS_ProgressInfo pi;
 568
 569   p = sc->fi_pos;
 570   pi.status = GNUNET_FS_STATUS_PUBLISH_PROGRESS;
 571   make_publish_status (&pi, sc, p, offset);
 572   pi.value.publish.specifics.progress.data = pt_block;
 573   pi.value.publish.specifics.progress.offset = offset;
 574   pi.value.publish.specifics.progress.data_len = pt_size;
 575   pi.value.publish.specifics.progress.depth = depth;
 576   p->client_info
 577     = sc->h->upcb (sc->h->upcb_cls,
 578                    &pi);
 579 }
 580
 581
 582 /**
 583  * We are uploading a file or directory; load (if necessary) the next
 584  * block into memory, encrypt it and send it to the FS service.  Then
 585  * continue with the main task.
 586  *
 587  * @param sc overall upload data
 588  */
 589 static void
 590 publish_content (struct GNUNET_FS_PublishContext *sc)
 591 {
 592   struct GNUNET_FS_FileInformation *p;
 593   char *emsg;
 594   struct GNUNET_FS_DirectoryBuilder *db;
 595   struct GNUNET_FS_FileInformation *dirpos;
 596   void *raw_data;
 597   uint64_t size;
 598
 599   p = sc->fi_pos;
 600   if (NULL == p->te)
 601     {
 602       if (p->is_directory)
 603         {
 604           db = GNUNET_FS_directory_builder_create (p->meta);
 605           dirpos = p->data.dir.entries;
 606           while (NULL != dirpos)
 607             {
 608               if (dirpos->is_directory)
 609                 {
 610                   raw_data = dirpos->data.dir.dir_data;
 611                   dirpos->data.dir.dir_data = NULL;
 612                 }
 613               else
 614                 {
 615                   raw_data = NULL;
 616                   if ( (dirpos->data.file.file_size < MAX_INLINE_SIZE) &&
 617                        (dirpos->data.file.file_size > 0) )
 618                     {
 619                       raw_data = GNUNET_malloc (dirpos->data.file.file_size);
 620                       emsg = NULL;
 621                       if (dirpos->data.file.file_size !=
 622                           dirpos->data.file.reader (dirpos->data.file.reader_cls,
 623                                                     0,
 624                                                     dirpos->data.file.file_size,
 625                                                     raw_data,
 626                                                     &emsg))
 627                         {
 628                           GNUNET_free_non_null (emsg);
 629                           GNUNET_free (raw_data);
 630                           raw_data = NULL;
 631                         }
 632                     }
 633                 }
 634               GNUNET_FS_directory_builder_add (db,
 635                                                dirpos->chk_uri,
 636                                                dirpos->meta,
 637                                                raw_data);
 638               GNUNET_free_non_null (raw_data);
 639               dirpos = dirpos->next;
 640             }
 641           GNUNET_FS_directory_builder_finish (db,
 642                                               &p->data.dir.dir_size,
 643                                               &p->data.dir.dir_data);
 644         }
 645       size = (p->is_directory)
 646         ? p->data.dir.dir_size
 647         : p->data.file.file_size;
 648       p->te = GNUNET_FS_tree_encoder_create (sc->h,
 649                                              size,
 650                                              sc,
 651                                              &block_reader,
 652                                              &block_proc,
 653                                              &progress_proc,
 654                                              &encode_cont);
 655
 656     }
 657   GNUNET_FS_tree_encoder_next (p->te);
 658 }
 659
 660
 661 /**
 662  * Process the response (or lack thereof) from
 663  * the "fs" service to our 'start index' request.
 664  *
 665  * @param cls closure (of type "struct GNUNET_FS_PublishContext*"_)
 666  * @param msg the response we got
 667  */
 668 static void
 669 process_index_start_response (void *cls,
 670                               const struct GNUNET_MessageHeader *msg)
 671 {
 672   struct GNUNET_FS_PublishContext *sc = cls;
 673   struct GNUNET_FS_FileInformation *p;
 674   const char *emsg;
 675   uint16_t msize;
 676
 677   GNUNET_CLIENT_disconnect (sc->client);
 678   sc->client = NULL;
 679   p = sc->fi_pos;
 680   if (msg == NULL)
 681     {
 682       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 683                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 684                   p->data.file.filename,
 685                   _("timeout on index-start request to `fs' service"));
 686       p->data.file.do_index = GNUNET_NO;
 687       publish_content (sc);
 688       return;
 689     }
 690   if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_INDEX_START_OK)
 691     {
 692       msize = ntohs (msg->size);
 693       emsg = (const char *) &msg[1];
 694       if ( (msize <= sizeof (struct GNUNET_MessageHeader)) ||
 695            (emsg[msize - sizeof(struct GNUNET_MessageHeader) - 1] != '\0') )
 696         emsg = gettext_noop ("unknown error");
 697       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 698                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 699                   p->data.file.filename,
 700                   gettext (emsg));
 701       p->data.file.do_index = GNUNET_NO;
 702       publish_content (sc);
 703       return;
 704     }
 705   /* success! continue with indexing */
 706   publish_content (sc);
 707 }
 708
 709
 710 /**
 711  * Function called once the hash computation over an
 712  * indexed file has completed.
 713  *
 714  * @param cls closure, our publishing context
 715  * @param res resulting hash, NULL on error
 716  */
 717 static void
 718 hash_for_index_cb (void *cls,
 719                    const GNUNET_HashCode *
 720                    res)
 721 {
 722   struct GNUNET_FS_PublishContext *sc = cls;
 723   struct GNUNET_FS_FileInformation *p;
 724   struct IndexStartMessage *ism;
 725   size_t slen;
 726   struct GNUNET_CLIENT_Connection *client;
 727   uint32_t dev;
 728   uint64_t ino;
 729
 730   p = sc->fi_pos;
 731   if (NULL == res)
 732     {
 733       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 734                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 735                   p->data.file.filename,
 736                   _("failed to compute hash"));
 737       p->data.file.do_index = GNUNET_NO;
 738       publish_content (sc);
 739       return;
 740     }
 741   slen = strlen (p->data.file.filename) + 1;
 742   if (slen > GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof(struct IndexStartMessage))
 743     {
 744       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 745                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 746                   p->data.file.filename,
 747                   _("filename too long"));
 748       p->data.file.do_index = GNUNET_NO;
 749       publish_content (sc);
 750       return;
 751     }
 752   client = GNUNET_CLIENT_connect (sc->h->sched,
 753                                   "fs",
 754                                   sc->h->cfg);
 755   if (NULL == client)
 756     {
 757       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 758                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 759                   p->data.file.filename,
 760                   _("could not connect to `fs' service"));
 761       p->data.file.do_index = GNUNET_NO;
 762       publish_content (sc);
 763       return;
 764     }
 765   p->data.file.file_id = *res;
 766   ism = GNUNET_malloc (sizeof(struct IndexStartMessage) +
 767                        slen);
 768   ism->header.size = htons(sizeof(struct IndexStartMessage) +
 769                            slen);
 770   ism->header.type = htons(GNUNET_MESSAGE_TYPE_FS_INDEX_START);
 771   if (GNUNET_OK ==
 772       GNUNET_DISK_file_get_identifiers (p->data.file.filename,
 773                                         &dev,
 774                                         &ino))
 775     {
 776       ism->device = htonl (dev);
 777       ism->inode = GNUNET_htonll(ino);
 778     }
 779   memcpy (&ism[1],
 780           p->data.file.filename,
 781           slen);
 782   sc->client = client;
 783   GNUNET_CLIENT_transmit_and_get_response (client,
 784                                            &ism->header,
 785                                            GNUNET_TIME_UNIT_FOREVER_REL,
 786                                            &process_index_start_response,
 787                                            sc);
 788   GNUNET_free (ism);
 789 }
 790
 791
 792 /**
 793  * Main function that performs the upload.
 794  * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
 795  * @param tc task context
 796  */
 797 static void
 798 do_upload (void *cls,
 799            const struct GNUNET_SCHEDULER_TaskContext *tc)
 800 {
 801   struct GNUNET_FS_PublishContext *sc = cls;
 802   struct GNUNET_FS_ProgressInfo pi;
 803   struct GNUNET_FS_FileInformation *p;
 804   char *fn;
 805
 806   sc->upload_task = GNUNET_SCHEDULER_NO_TASK;
 807   p = sc->fi_pos;
 808   if (NULL == p)
 809     {
 810       /* upload of entire hierarchy complete,
 811          publish namespace entries */
 812       publish_sblock (sc);
 813       return;
 814     }
 815   /* find starting position */
 816   while ( (p->is_directory) &&
 817           (NULL != p->data.dir.entries) &&
 818           (NULL == p->emsg) &&
 819           (NULL == p->data.dir.entries->chk_uri) )
 820     {
 821       p = p->data.dir.entries;
 822       sc->fi_pos = p;
 823     }
 824   /* abort on error */
 825   if (NULL != p->emsg)
 826     {
 827       /* error with current file, abort all
 828          related files as well! */
 829       while (NULL != p->dir)
 830         {
 831           fn = GNUNET_CONTAINER_meta_data_get_by_type (p->meta,
 832                                                        EXTRACTOR_FILENAME);
 833           p = p->dir;
 834           GNUNET_asprintf (&p->emsg,
 835                            _("Recursive upload failed at `%s'"),
 836                            fn);
 837           GNUNET_free (fn);
 838           GNUNET_FS_file_information_sync (p);
 839           pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 840           make_publish_status (&pi, sc, p, 0);
 841           pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 842           pi.value.publish.specifics.error.message = p->emsg;
 843           p->client_info
 844             = sc->h->upcb (sc->h->upcb_cls,
 845                            &pi);
 846         }
 847       sc->all_done = GNUNET_YES;
 848       return;
 849     }
 850   /* handle completion */
 851   if (NULL != p->chk_uri)
 852     {
 853       /* upload of "p" complete, publish KBlocks! */
 854       GNUNET_FS_publish_ksk (sc->h,
 855                              p->keywords,
 856                              p->meta,
 857                              p->chk_uri,
 858                              p->expirationTime,
 859                              p->anonymity,
 860                              p->priority,
 861                              sc->options,
 862                              &publish_kblocks_cont,
 863                              sc);
 864       return;
 865     }
 866   if ( (!p->is_directory) &&
 867        (p->data.file.do_index) )
 868     {
 869       if (NULL == p->data.file.filename)
 870         {
 871           p->data.file.do_index = GNUNET_NO;
 872           GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 873                       _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 874                       "<no-name>",
 875                       _("needs to be an actual file"));
 876           publish_content (sc);
 877           return;
 878         }
 879       GNUNET_CRYPTO_hash_file (sc->h->sched,
 880                                GNUNET_SCHEDULER_PRIORITY_IDLE,
 881                                GNUNET_NO,
 882                                p->data.file.filename,
 883                                HASHING_BLOCKSIZE,
 884                                &hash_for_index_cb,
 885                                sc);
 886       return;
 887     }
 888   publish_content (sc);
 889 }
 890
 891
 892 /**
 893  * Signal the FS's progress function that we are starting
 894  * an upload.
 895  *
 896  * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
 897  * @param fi the entry in the publish-structure
 898  * @param length length of the file or directory
 899  * @param meta metadata for the file or directory (can be modified)
 900  * @param uri pointer to the keywords that will be used for this entry (can be modified)
 901  * @param anonymity pointer to selected anonymity level (can be modified)
 902  * @param priority pointer to selected priority (can be modified)
 903  * @param expirationTime pointer to selected expiration time (can be modified)
 904  * @param client_info pointer to client context set upon creation (can be modified)
 905  * @return GNUNET_OK to continue (always)
 906  */
 907 static int
 908 fip_signal_start(void *cls,
 909                  struct GNUNET_FS_FileInformation *fi,
 910                  uint64_t length,
 911                  struct GNUNET_CONTAINER_MetaData *meta,
 912                  struct GNUNET_FS_Uri **uri,
 913                  uint32_t *anonymity,
 914                  uint32_t *priority,
 915                  struct GNUNET_TIME_Absolute *expirationTime,
 916                  void **client_info)
 917 {
 918   struct GNUNET_FS_PublishContext *sc = cls;
 919   struct GNUNET_FS_ProgressInfo pi;
 920
 921   pi.status = GNUNET_FS_STATUS_PUBLISH_START;
 922   make_publish_status (&pi, sc, fi, 0);
 923   *client_info = sc->h->upcb (sc->h->upcb_cls,
 924                               &pi);
 925   return GNUNET_OK;
 926 }
 927
 928
 929 /**
 930  * Publish a file or directory.
 931  *
 932  * @param h handle to the file sharing subsystem
 933  * @param fi information about the file or directory structure to publish
 934  * @param namespace namespace to publish the file in, NULL for no namespace
 935  * @param nid identifier to use for the publishd content in the namespace
 936  *        (can be NULL, must be NULL if namespace is NULL)
 937  * @param nuid update-identifier that will be used for future updates
 938  *        (can be NULL, must be NULL if namespace or nid is NULL)
 939  * @param options options for the publication
 940  * @return context that can be used to control the publish operation
 941  */
 942 struct GNUNET_FS_PublishContext *
 943 GNUNET_FS_publish_start (struct GNUNET_FS_Handle *h,
 944                          struct GNUNET_FS_FileInformation *fi,
 945                          struct GNUNET_FS_Namespace *namespace,
 946                          const char *nid,
 947                          const char *nuid,
 948                          enum GNUNET_FS_PublishOptions options)
 949 {
 950   struct GNUNET_FS_PublishContext *ret;
 951   struct GNUNET_DATASTORE_Handle *dsh;
 952
 953   if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
 954     {
 955       dsh = GNUNET_DATASTORE_connect (h->cfg,
 956                                       h->sched);
 957       if (NULL == dsh)
 958         return NULL;
 959     }
 960   else
 961     {
 962       dsh = NULL;
 963     }
 964   ret = GNUNET_malloc (sizeof (struct GNUNET_FS_PublishContext));
 965   ret->dsh = dsh;
 966   ret->h = h;
 967   ret->fi = fi;
 968   ret->namespace = namespace;
 969   if (namespace != NULL)
 970     {
 971       namespace->rc++;
 972       GNUNET_assert (NULL != nid);
 973       ret->nid = GNUNET_strdup (nid);
 974       if (NULL != nuid)
 975         ret->nuid = GNUNET_strdup (nuid);
 976     }
 977   // FIXME: make upload persistent!
 978
 979   /* signal start */
 980   GNUNET_FS_file_information_inspect (ret->fi,
 981                                       &fip_signal_start,
 982                                       ret);
 983   ret->fi_pos = ret->fi;
 984
 985   // FIXME: calculate space needed for "fi"
 986   // and reserve as first task (then trigger
 987   // "do_upload" from that continuation)!
 988   ret->upload_task
 989     = GNUNET_SCHEDULER_add_delayed (h->sched,
 990                                     GNUNET_NO,
 991                                     GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 992                                     GNUNET_SCHEDULER_NO_TASK,
 993                                     GNUNET_TIME_UNIT_ZERO,
 994                                     &do_upload,
 995                                     ret);
 996   return ret;
 997 }
 998
 999
1000 /**
1001  * Signal the FS's progress function that we are stopping
1002  * an upload.
1003  *
1004  * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
1005  * @param fi the entry in the publish-structure
1006  * @param length length of the file or directory
1007  * @param meta metadata for the file or directory (can be modified)
1008  * @param uri pointer to the keywords that will be used for this entry (can be modified)
1009  * @param anonymity pointer to selected anonymity level (can be modified)
1010  * @param priority pointer to selected priority (can be modified)
1011  * @param expirationTime pointer to selected expiration time (can be modified)
1012  * @param client_info pointer to client context set upon creation (can be modified)
1013  * @return GNUNET_OK to continue (always)
1014  */
1015 static int
1016 fip_signal_stop(void *cls,
1017                 struct GNUNET_FS_FileInformation *fi,
1018                 uint64_t length,
1019                 struct GNUNET_CONTAINER_MetaData *meta,
1020                 struct GNUNET_FS_Uri **uri,
1021                 uint32_t *anonymity,
1022                 uint32_t *priority,
1023                 struct GNUNET_TIME_Absolute *expirationTime,
1024                 void **client_info)
1025 {
1026   struct GNUNET_FS_PublishContext*sc = cls;
1027   struct GNUNET_FS_ProgressInfo pi;
1028   uint64_t off;
1029
1030   off = (fi->chk_uri == NULL) ? 0 : length;
1031   pi.status = GNUNET_FS_STATUS_PUBLISH_STOPPED;
1032   make_publish_status (&pi, sc, fi, off);
1033   GNUNET_break (NULL ==
1034                 sc->h->upcb (sc->h->upcb_cls,
1035                              &pi));
1036   *client_info = NULL;
1037   return GNUNET_OK;
1038 }
1039
1040
1041 /**
1042  * Stop an upload.  Will abort incomplete uploads (but
1043  * not remove blocks that have already been publishd) or
1044  * simply clean up the state for completed uploads.
1045  * Must NOT be called from within the event callback!
1046  *
1047  * @param sc context for the upload to stop
1048  */
1049 void
1050 GNUNET_FS_publish_stop (struct GNUNET_FS_PublishContext *sc)
1051 {
1052   if (GNUNET_SCHEDULER_NO_TASK != sc->upload_task)
1053     GNUNET_SCHEDULER_cancel (sc->h->sched, sc->upload_task);
1054   else
1055     GNUNET_assert (sc->all_done == GNUNET_YES);
1056   // FIXME: remove from persistence DB (?) --- think more about
1057   //        shutdown / persistent-resume APIs!!!
1058   GNUNET_FS_file_information_inspect (sc->fi,
1059                                       &fip_signal_stop,
1060                                       sc);
1061   if (GNUNET_YES == sc->in_network_wait)
1062     {
1063       sc->in_network_wait = GNUNET_SYSERR;
1064       return;
1065     }
1066   publish_cleanup (sc);
1067 }
1068
1069
1070 /**
1071  * Context for the KSK publication.
1072  */
1073 struct PublishKskContext
1074 {
1075
1076   /**
1077    * Keywords to use.
1078    */
1079   struct GNUNET_FS_Uri *ksk_uri;
1080
1081   /**
1082    * Global FS context.
1083    */
1084   struct GNUNET_FS_Handle *h;
1085
1086   /**
1087    * The master block that we are sending
1088    * (in plaintext), has "mdsize+slen" more
1089    * bytes than the struct would suggest.
1090    */
1091   struct KBlock *kb;
1092
1093   /**
1094    * Buffer of the same size as "kb" for
1095    * the encrypted version.
1096    */
1097   struct KBlock *cpy;
1098
1099   /**
1100    * Handle to the datastore, NULL if we are just
1101    * simulating.
1102    */
1103   struct GNUNET_DATASTORE_Handle *dsh;
1104
1105   /**
1106    * Function to call once we're done.
1107    */
1108   GNUNET_FS_PublishContinuation cont;
1109
1110   /**
1111    * Closure for cont.
1112    */
1113   void *cont_cls;
1114
1115   /**
1116    * When should the KBlocks expire?
1117    */
1118   struct GNUNET_TIME_Absolute expirationTime;
1119
1120   /**
1121    * Size of the serialized metadata.
1122    */
1123   ssize_t mdsize;
1124
1125   /**
1126    * Size of the (CHK) URI as a string.
1127    */
1128   size_t slen;
1129
1130   /**
1131    * Keyword that we are currently processing.
1132    */
1133   unsigned int i;
1134
1135   /**
1136    * Anonymity level for the KBlocks.
1137    */
1138   uint32_t anonymity;
1139
1140   /**
1141    * Priority for the KBlocks.
1142    */
1143   uint32_t priority;
1144 };
1145
1146
1147 /**
1148  * Continuation of "GNUNET_FS_publish_ksk" that performs
1149  * the actual publishing operation (iterating over all
1150  * of the keywords).
1151  *
1152  * @param cls closure of type "struct PublishKskContext*"
1153  * @param tc unused
1154  */
1155 static void
1156 publish_ksk_cont (void *cls,
1157                   const struct GNUNET_SCHEDULER_TaskContext *tc);
1158
1159
1160 /**
1161  * Function called by the datastore API with
1162  * the result from the PUT request.
1163  *
1164  * @param cls closure of type "struct PublishKskContext*"
1165  * @param success GNUNET_OK on success
1166  * @param msg error message (or NULL)
1167  */
1168 static void
1169 kb_put_cont (void *cls,
1170              int success,
1171              const char *msg)
1172 {
1173   struct PublishKskContext *pkc = cls;
1174
1175   if (GNUNET_OK != success)
1176     {
1177       GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1178       GNUNET_free (pkc->cpy);
1179       GNUNET_free (pkc->kb);
1180       pkc->cont (pkc->cont_cls,
1181                  NULL,
1182                  msg);
1183       GNUNET_FS_uri_destroy (pkc->ksk_uri);
1184       GNUNET_free (pkc);
1185       return;
1186     }
1187   GNUNET_SCHEDULER_add_continuation (pkc->h->sched,
1188                                      GNUNET_NO,
1189                                      &publish_ksk_cont,
1190                                      pkc,
1191                                      GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1192 }
1193
1194
1195 /**
1196  * Continuation of "GNUNET_FS_publish_ksk" that performs the actual
1197  * publishing operation (iterating over all of the keywords).
1198  *
1199  * @param cls closure of type "struct PublishKskContext*"
1200  * @param tc unused
1201  */
1202 static void
1203 publish_ksk_cont (void *cls,
1204                   const struct GNUNET_SCHEDULER_TaskContext *tc)
1205 {
1206   struct PublishKskContext *pkc = cls;
1207   const char *keyword;
1208   GNUNET_HashCode key;
1209   GNUNET_HashCode query;
1210   struct GNUNET_CRYPTO_AesSessionKey skey;
1211   struct GNUNET_CRYPTO_AesInitializationVector iv;
1212   struct GNUNET_CRYPTO_RsaPrivateKey *pk;
1213
1214
1215   if ( (pkc->i == pkc->ksk_uri->data.ksk.keywordCount) ||
1216        (NULL == pkc->dsh) )
1217     {
1218       if (NULL != pkc->dsh)
1219         GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1220       GNUNET_free (pkc->cpy);
1221       GNUNET_free (pkc->kb);
1222       pkc->cont (pkc->cont_cls,
1223                  pkc->ksk_uri,
1224                  NULL);
1225       GNUNET_FS_uri_destroy (pkc->ksk_uri);
1226       GNUNET_free (pkc);
1227       return;
1228     }
1229   keyword = pkc->ksk_uri->data.ksk.keywords[pkc->i++];
1230   /* first character of keyword indicates if it is
1231      mandatory or not -- ignore for hashing */
1232   GNUNET_CRYPTO_hash (&keyword[1], strlen (&keyword[1]), &key);
1233   GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
1234   GNUNET_CRYPTO_aes_encrypt (&pkc->kb[1],
1235                              pkc->slen + pkc->mdsize,
1236                              &skey,
1237                              &iv,
1238                              &pkc->cpy[1]);
1239   pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&key);
1240   GNUNET_CRYPTO_rsa_key_get_public (pk, &pkc->cpy->keyspace);
1241   GNUNET_CRYPTO_hash (&pkc->cpy->keyspace,
1242                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1243                       &query);
1244   GNUNET_assert (GNUNET_OK ==
1245                  GNUNET_CRYPTO_rsa_sign (pk,
1246                                          &pkc->cpy->purpose,
1247                                          &pkc->cpy->signature));
1248   GNUNET_CRYPTO_rsa_key_free (pk);
1249   GNUNET_DATASTORE_put (pkc->dsh,
1250                         0,
1251                         &query,
1252                         pkc->mdsize +
1253                         sizeof (struct KBlock) +
1254                         pkc->slen,
1255                         pkc->cpy,
1256                         GNUNET_DATASTORE_BLOCKTYPE_KBLOCK,
1257                         pkc->priority,
1258                         pkc->anonymity,
1259                         pkc->expirationTime,
1260                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1261                         &kb_put_cont,
1262                         pkc);
1263 }
1264
1265
1266 /**
1267  * Publish a CHK under various keywords on GNUnet.
1268  *
1269  * @param h handle to the file sharing subsystem
1270  * @param ksk_uri keywords to use
1271  * @param meta metadata to use
1272  * @param uri URI to refer to in the KBlock
1273  * @param expirationTime when the KBlock expires
1274  * @param anonymity anonymity level for the KBlock
1275  * @param priority priority for the KBlock
1276  * @param options publication options
1277  * @param cont continuation
1278  * @param cont_cls closure for cont
1279  */
1280 void
1281 GNUNET_FS_publish_ksk (struct GNUNET_FS_Handle *h,
1282                        struct GNUNET_FS_Uri *ksk_uri,
1283                        struct GNUNET_CONTAINER_MetaData *meta,
1284                        struct GNUNET_FS_Uri *uri,
1285                        struct GNUNET_TIME_Absolute expirationTime,
1286                        uint32_t anonymity,
1287                        uint32_t priority,
1288                        enum GNUNET_FS_PublishOptions options,
1289                        GNUNET_FS_PublishContinuation cont,
1290                        void *cont_cls)
1291 {
1292   struct PublishKskContext *pkc;
1293   char *uris;
1294   size_t size;
1295   char *kbe;
1296
1297   pkc = GNUNET_malloc (sizeof (struct PublishKskContext));
1298   pkc->h = h;
1299   pkc->expirationTime = expirationTime;
1300   pkc->anonymity = anonymity;
1301   pkc->priority = priority;
1302   pkc->cont = cont;
1303   pkc->cont_cls = cont_cls;
1304   if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
1305     {
1306       pkc->dsh = GNUNET_DATASTORE_connect (h->cfg,
1307                                            h->sched);
1308       if (pkc->dsh == NULL)
1309         {
1310           cont (cont_cls, NULL, _("Could not connect to datastore."));
1311           GNUNET_free (pkc);
1312           return;
1313         }
1314     }
1315   pkc->mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta,
1316                                                                 GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1317   GNUNET_assert (pkc->mdsize >= 0);
1318   uris = GNUNET_FS_uri_to_string (uri);
1319   pkc->slen = strlen (uris) + 1;
1320   size = pkc->mdsize + sizeof (struct KBlock) + pkc->slen;
1321   if (size > MAX_KBLOCK_SIZE)
1322     {
1323       size = MAX_KBLOCK_SIZE;
1324       pkc->mdsize = size - sizeof (struct KBlock) - pkc->slen;
1325     }
1326   pkc->kb = GNUNET_malloc (size);
1327   kbe = (char *) &pkc->kb[1];
1328   memcpy (kbe, uris, pkc->slen);
1329   GNUNET_free (uris);
1330   pkc->mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
1331                                                       &kbe[pkc->slen],
1332                                                       pkc->mdsize,
1333                                                       GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1334   if (pkc->mdsize == -1)
1335     {
1336       GNUNET_break (0);
1337       GNUNET_free (uris);
1338       GNUNET_free (pkc->kb);
1339       if (pkc->dsh != NULL)
1340         GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1341       cont (cont_cls, NULL, _("Internal error."));
1342       GNUNET_free (pkc);
1343       return;
1344     }
1345   size = sizeof (struct KBlock) + pkc->slen + pkc->mdsize;
1346
1347   pkc->cpy = GNUNET_malloc (size);
1348   pkc->cpy->purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1349                                   sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1350                                   pkc->mdsize +
1351                                   pkc->slen);
1352   pkc->cpy->purpose.purpose = htonl(GNUNET_SIGNATURE_PURPOSE_FS_KBLOCK);
1353   pkc->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
1354   GNUNET_SCHEDULER_add_continuation (h->sched,
1355                                      GNUNET_NO,
1356                                      &publish_ksk_cont,
1357                                      pkc,
1358                                      GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1359 }
1360
1361
1362 /**
1363  * Context for the SKS publication.
1364  */
1365 struct PublishSksContext
1366 {
1367
1368   /**
1369    * Global FS context.
1370    */
1371   struct GNUNET_FS_Uri *uri;
1372
1373   /**
1374    * Handle to the datastore.
1375    */
1376   struct GNUNET_DATASTORE_Handle *dsh;
1377
1378   /**
1379    * Function to call once we're done.
1380    */
1381   GNUNET_FS_PublishContinuation cont;
1382
1383   /**
1384    * Closure for cont.
1385    */
1386   void *cont_cls;
1387
1388 };
1389
1390
1391 /**
1392  * Function called by the datastore API with
1393  * the result from the PUT (SBlock) request.
1394  *
1395  * @param cls closure of type "struct PublishSksContext*"
1396  * @param success GNUNET_OK on success
1397  * @param msg error message (or NULL)
1398  */
1399 static void
1400 sb_put_cont (void *cls,
1401              int success,
1402              const char *msg)
1403 {
1404   struct PublishSksContext *psc = cls;
1405
1406   if (NULL != psc->dsh)
1407     GNUNET_DATASTORE_disconnect (psc->dsh, GNUNET_NO);
1408   if (GNUNET_OK != success)
1409     psc->cont (psc->cont_cls,
1410                NULL,
1411                msg);
1412   else
1413     psc->cont (psc->cont_cls,
1414                psc->uri,
1415                NULL);
1416   GNUNET_FS_uri_destroy (psc->uri);
1417   GNUNET_free (psc);
1418 }
1419
1420
1421 /**
1422  * Publish an SBlock on GNUnet.
1423  *
1424  * @param h handle to the file sharing subsystem
1425  * @param namespace namespace to publish in
1426  * @param identifier identifier to use
1427  * @param update update identifier to use
1428  * @param meta metadata to use
1429  * @param uri URI to refer to in the SBlock
1430  * @param expirationTime when the SBlock expires
1431  * @param anonymity anonymity level for the SBlock
1432  * @param priority priority for the SBlock
1433  * @param options publication options
1434  * @param cont continuation
1435  * @param cont_cls closure for cont
1436  */
1437 void
1438 GNUNET_FS_publish_sks (struct GNUNET_FS_Handle *h,
1439                        struct GNUNET_FS_Namespace *namespace,
1440                        const char *identifier,
1441                        const char *update,
1442                        struct GNUNET_CONTAINER_MetaData *meta,
1443                        struct GNUNET_FS_Uri *uri,
1444                        struct GNUNET_TIME_Absolute expirationTime,
1445                        uint32_t anonymity,
1446                        uint32_t priority,
1447                        enum GNUNET_FS_PublishOptions options,
1448                        GNUNET_FS_PublishContinuation cont,
1449                        void *cont_cls)
1450 {
1451   struct PublishSksContext *psc;
1452   struct GNUNET_CRYPTO_AesSessionKey sk;
1453   struct GNUNET_CRYPTO_AesInitializationVector iv;
1454   struct GNUNET_FS_Uri *sks_uri;
1455   char *uris;
1456   size_t size;
1457   size_t slen;
1458   size_t nidlen;
1459   size_t idlen;
1460   ssize_t mdsize;
1461   struct SBlock *sb;
1462   struct SBlock *sb_enc;
1463   char *dest;
1464   GNUNET_HashCode key;           /* hash of thisId = key */
1465   GNUNET_HashCode id;          /* hash of hc = identifier */
1466
1467   uris = GNUNET_FS_uri_to_string (uri);
1468   slen = strlen (uris) + 1;
1469   idlen = strlen (identifier);
1470   if (update == NULL)
1471     update = "";
1472   nidlen = strlen (update) + 1;
1473   mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta,
1474                                                            GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1475
1476   size = sizeof (struct SBlock) + slen + nidlen + mdsize;
1477   if (size > MAX_SBLOCK_SIZE)
1478     {
1479       size = MAX_SBLOCK_SIZE;
1480       mdsize = size - (sizeof (struct SBlock) + slen + nidlen);
1481     }
1482   sb = GNUNET_malloc (sizeof (struct SBlock) + size);
1483   dest = (char *) &sb[1];
1484   memcpy (dest, update, nidlen);
1485   dest += nidlen;
1486   memcpy (dest, uris, slen);
1487   dest += slen;
1488   mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
1489                                                  dest,
1490                                                  mdsize,
1491                                                  GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1492   if (mdsize == -1)
1493     {
1494       GNUNET_break (0);
1495       GNUNET_free (uris);
1496       GNUNET_free (sb);
1497       cont (cont_cls,
1498             NULL,
1499             _("Internal error."));
1500       return;
1501     }
1502   size = sizeof (struct SBlock) + mdsize + slen + nidlen;
1503   sb_enc = GNUNET_malloc (sizeof (struct SBlock) + size);
1504   GNUNET_CRYPTO_hash (identifier, idlen, &key);
1505   GNUNET_CRYPTO_hash (&key, sizeof (GNUNET_HashCode), &id);
1506   sks_uri = GNUNET_malloc (sizeof (struct GNUNET_FS_Uri));
1507   sks_uri->type = sks;
1508   GNUNET_CRYPTO_rsa_key_get_public (namespace->key, &sb_enc->subspace);
1509   GNUNET_CRYPTO_hash (&sb_enc->subspace,
1510                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1511                       &sks_uri->data.sks.namespace);
1512   sks_uri->data.sks.identifier = GNUNET_strdup (identifier);
1513   GNUNET_CRYPTO_hash_xor (&id,
1514                           &sks_uri->data.sks.namespace,
1515                           &sb_enc->identifier);
1516   GNUNET_CRYPTO_hash_to_aes_key (&key, &sk, &iv);
1517   GNUNET_CRYPTO_aes_encrypt (&sb[1],
1518                              size - sizeof (struct SBlock),
1519                              &sk,
1520                              &iv,
1521                              &sb_enc[1]);
1522   GNUNET_free (sb);
1523   sb_enc->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_SBLOCK);
1524   sb_enc->purpose.size = htonl(slen + mdsize + nidlen
1525                                + sizeof(struct SBlock)
1526                                - sizeof(struct GNUNET_CRYPTO_RsaSignature));
1527   GNUNET_assert (GNUNET_OK ==
1528                  GNUNET_CRYPTO_rsa_sign (namespace->key,
1529                                          &sb_enc->purpose,
1530                                          &sb_enc->signature));
1531   psc = GNUNET_malloc (sizeof(struct PublishSksContext));
1532   psc->uri = sks_uri;
1533   psc->cont = cont;
1534   psc->cont_cls = cont_cls;
1535   if (0 != (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
1536     {
1537       GNUNET_free (sb_enc);
1538       sb_put_cont (psc,
1539                    GNUNET_OK,
1540                    NULL);
1541       return;
1542     }
1543   psc->dsh = GNUNET_DATASTORE_connect (h->cfg, h->sched);
1544   if (NULL == psc->dsh)
1545     {
1546       GNUNET_free (sb_enc);
1547       sb_put_cont (psc,
1548                    GNUNET_NO,
1549                    _("Failed to connect to datastore."));
1550       return;
1551     }
1552
1553   GNUNET_DATASTORE_put (psc->dsh,
1554                         0,
1555                         &sb->identifier,
1556                         size,
1557                         sb_enc,
1558                         GNUNET_DATASTORE_BLOCKTYPE_SBLOCK,
1559                         priority,
1560                         anonymity,
1561                         expirationTime,
1562                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1563                         &sb_put_cont,
1564                         psc);
1565   GNUNET_free (sb_enc);
1566 }
1567
1568
1569 /* end of fs_publish.c */