blob.c

   1 /*
   2  * Copyright (C) 2007-2014 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file blob.c Macros and functions for blob handling. */
   8
   9 #include <regex.h>
  10 #include <fnmatch.h>
  11 #include <osl.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "crypt.h"
  16 #include "string.h"
  17 #include "afh.h"
  18 #include "afs.h"
  19 #include "ipc.h"
  20 #include "portable_io.h"
  21 #include "sideband.h"
  22 #include "command.h"
  23
  24 /**
  25  * Compare two osl objects pointing to unsigned integers of 32 bit size.
  26  *
  27  * \param obj1 Pointer to the first integer.
  28  * \param obj2 Pointer to the second integer.
  29  *
  30  * \return The values required for an osl compare function.
  31  *
  32  * \sa osl_compare_func, osl_hash_compare().
  33  */
  34 static int uint32_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  35 {
  36         uint32_t d1 = read_u32((const char *)obj1->data);
  37         uint32_t d2 = read_u32((const char *)obj2->data);
  38
  39         if (d1 < d2)
  40                 return 1;
  41         if (d1 > d2)
  42                 return -1;
  43         return 0;
  44 }
  45
  46 static struct osl_column_description blob_cols[] = {
  47         [BLOBCOL_ID] = {
  48                 .storage_type = OSL_MAPPED_STORAGE,
  49                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  50                 .name = "id",
  51                 .data_size = 4,
  52                 .compare_function = uint32_compare
  53         },
  54         [BLOBCOL_NAME] = {
  55                 .storage_type = OSL_MAPPED_STORAGE,
  56                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  57                 .name = "name",
  58                 .compare_function = string_compare
  59         },
  60         [BLOBCOL_DEF] = {
  61                 .storage_type = OSL_DISK_STORAGE,
  62                 .storage_flags = 0,
  63                 .name = "definition"
  64         }
  65 };
  66
  67 /** Define an osl table description for a blob table. */
  68 #define DEFINE_BLOB_TABLE_DESC(table_name) \
  69         struct osl_table_description table_name ## _table_desc = { \
  70                 .name = #table_name, \
  71                 .num_columns = NUM_BLOB_COLUMNS, \
  72                 .flags = OSL_LARGE_TABLE, \
  73                 .column_descriptions = blob_cols \
  74         };
  75
  76 /** Define a pointer to an osl blob table with a canonical name. */
  77 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
  78
  79
  80 /** Define a blob table. */
  81 #define INIT_BLOB_TABLE(table_name) \
  82         DEFINE_BLOB_TABLE_DESC(table_name); \
  83         DEFINE_BLOB_TABLE_PTR(table_name);
  84
  85 /* doxygen isn't smart enough to recognize these */
  86 /** \cond blob_table */
  87 INIT_BLOB_TABLE(lyrics);
  88 INIT_BLOB_TABLE(images);
  89 INIT_BLOB_TABLE(moods);
  90 INIT_BLOB_TABLE(playlists);
  91 /** \endcond blob_table */
  92
  93 /** Flags that may be passed to the \p ls functions of each blob  type. */
  94 enum blob_ls_flags {
  95         /** List both id and name. */
  96         BLOB_LS_FLAG_LONG = 1,
  97         /** Reverse sort order. */
  98         BLOB_LS_FLAG_REVERSE = 2,
  99         /** Sort by id instead of name. */
 100         BLOB_LS_FLAG_SORT_BY_ID = 4,
 101 };
 102
 103 /** Structure passed to the \p print_blob function. */
 104 struct lsblob_action_data {
 105         /** The flags given at the command line. */
 106         uint32_t flags;
 107         /** Message buffer. */
 108         struct para_buffer pb;
 109 };
 110
 111 static int print_blob(struct osl_table *table, struct osl_row *row,
 112                 const char *name, void *data)
 113 {
 114         struct lsblob_action_data *lbad = data;
 115         struct osl_object obj;
 116         uint32_t id;
 117         int ret;
 118
 119         if (!(lbad->flags & BLOB_LS_FLAG_LONG))
 120                 return para_printf(&lbad->pb, "%s\n", name);
 121         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 122         if (ret < 0) {
 123                 para_printf(&lbad->pb, "%s: %s\n", name, para_strerror(-ret));
 124                 return ret;
 125         }
 126         id = *(uint32_t *)obj.data;
 127         return para_printf(&lbad->pb, "%u\t%s\n", id, name);
 128 }
 129
 130 static void com_lsblob_callback(struct osl_table *table,
 131                 int fd, const struct osl_object *query)
 132 {
 133         struct lsblob_action_data lbad = {
 134                 .flags = *(uint32_t *)query->data,
 135                 .pb = {
 136                         .max_size = shm_get_shmmax(),
 137                         .private_data = &(struct afs_max_size_handler_data) {
 138                                 .fd = fd,
 139                                 .band = SBD_OUTPUT
 140                         },
 141                         .max_size_handler = afs_max_size_handler,
 142                 }
 143         };
 144         struct pattern_match_data pmd = {
 145                 .table = table,
 146                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
 147                         .size = query->size - sizeof(uint32_t)},
 148                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 149                 .match_col_num = BLOBCOL_NAME,
 150                 .data = &lbad,
 151                 .action = print_blob,
 152         };
 153         int ret;
 154
 155         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
 156                 pmd.pm_flags |= PM_REVERSE_LOOP;
 157         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 158                 pmd.loop_col_num = BLOBCOL_NAME;
 159         else
 160                 pmd.loop_col_num = BLOBCOL_ID;
 161         ret = for_each_matching_row(&pmd);
 162         if (ret < 0)
 163                 para_printf(&lbad.pb, "%s\n", para_strerror(-ret));
 164         else if (pmd.num_matches == 0 && pmd.patterns.size > 0)
 165                 para_printf(&lbad.pb, "no matches\n");
 166         if (lbad.pb.offset)
 167                 pass_buffer_as_shm(fd, SBD_OUTPUT, lbad.pb.buf, lbad.pb.offset);
 168         free(lbad.pb.buf);
 169 }
 170
 171 static int com_lsblob(callback_function *f, struct command_context *cc)
 172 {
 173         uint32_t flags = 0;
 174         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 175         int i;
 176
 177         for (i = 1; i < cc->argc; i++) {
 178                 const char *arg = cc->argv[i];
 179                 if (arg[0] != '-')
 180                         break;
 181                 if (!strcmp(arg, "--")) {
 182                         i++;
 183                         break;
 184                 }
 185                 if (!strcmp(arg, "-l")) {
 186                         flags |= BLOB_LS_FLAG_LONG;
 187                         continue;
 188                 }
 189                 if (!strcmp(arg, "-i")) {
 190                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 191                         continue;
 192                 }
 193                 if (!strcmp(arg, "-r")) {
 194                         flags |= BLOB_LS_FLAG_REVERSE;
 195                         continue;
 196                 }
 197                 break;
 198         }
 199 //      if (argc > i)
 200 //              return -E_BLOB_SYNTAX;
 201         return send_option_arg_callback_request(&options, cc->argc - i,
 202                 cc->argv + i, f, afs_cb_result_handler, cc);
 203 }
 204
 205 static int cat_blob(struct osl_table *table, struct osl_row *row,
 206                 __a_unused const char *name, void *data)
 207 {
 208         int ret = 0, ret2, fd = *(int *)data;
 209         struct osl_object obj;
 210
 211         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 212         if (ret < 0)
 213                 return (ret == osl(-E_OSL_EMPTY))? 0 : ret;
 214         assert(obj.size > 0);
 215         ret = pass_buffer_as_shm(fd, SBD_OUTPUT, obj.data, obj.size);
 216         ret2 = osl(osl_close_disk_object(&obj));
 217         return (ret < 0)? ret : ret2;
 218 }
 219
 220 static void com_catblob_callback(struct osl_table *table, int fd,
 221                 const struct osl_object *query)
 222 {
 223         struct pattern_match_data pmd = {
 224                 .table = table,
 225                 .patterns = *query,
 226                 .loop_col_num = BLOBCOL_NAME,
 227                 .match_col_num = BLOBCOL_NAME,
 228                 .pm_flags = PM_SKIP_EMPTY_NAME,
 229                 .data = &fd,
 230                 .action = cat_blob
 231         };
 232         for_each_matching_row(&pmd);
 233         if (pmd.num_matches == 0) {
 234                 char err_msg[] = "no matches\n";
 235                 pass_buffer_as_shm(fd, SBD_OUTPUT, err_msg, sizeof(err_msg));
 236         }
 237 }
 238
 239 static int com_catblob(callback_function *f, struct command_context *cc)
 240 {
 241         if (cc->argc < 2)
 242                 return -E_BLOB_SYNTAX;
 243         return send_standard_callback_request(cc->argc - 1, cc->argv + 1, f,
 244                 afs_cb_result_handler, cc);
 245 }
 246
 247 /** Used for removing rows from a blob table. */
 248 struct rmblob_data {
 249         /** Message buffer. */
 250         struct para_buffer pb;
 251 };
 252
 253 static int remove_blob(struct osl_table *table, struct osl_row *row,
 254                 const char *name, void *data)
 255 {
 256         struct rmblob_data *rmbd = data;
 257         int ret = osl(osl_del_row(table, row));
 258         if (ret < 0) {
 259                 para_printf(&rmbd->pb, "%s: %s\n", name, para_strerror(-ret));
 260                 return ret;
 261         }
 262         return 1;
 263 }
 264
 265 static void com_rmblob_callback(struct osl_table *table, int fd,
 266                 const struct osl_object *query)
 267 {
 268         int ret, ret2 = 0;
 269         struct rmblob_data rmbd = {
 270                 .pb = {
 271                         .max_size = shm_get_shmmax(),
 272                         .private_data = &(struct afs_max_size_handler_data) {
 273                                 .fd = fd,
 274                                 .band = SBD_OUTPUT
 275                         },
 276                         .max_size_handler = afs_max_size_handler,
 277                 }
 278         };
 279         struct pattern_match_data pmd = {
 280                 .table = table,
 281                 .patterns = *query,
 282                 .loop_col_num = BLOBCOL_NAME,
 283                 .match_col_num = BLOBCOL_NAME,
 284                 .pm_flags = PM_SKIP_EMPTY_NAME,
 285                 .data = &rmbd,
 286                 .action = remove_blob
 287         };
 288         ret = for_each_matching_row(&pmd);
 289         if (ret < 0) {
 290                 ret2 = para_printf(&rmbd.pb, "%s\n", para_strerror(-ret));
 291                 if (ret2 < 0)
 292                         goto out;
 293         }
 294         if (pmd.num_matches == 0)
 295                 ret2 = para_printf(&rmbd.pb, "no matches, nothing removed\n");
 296         else {
 297                 ret2 = para_printf(&rmbd.pb, "removed %d blobs\n", pmd.num_matches);
 298                 afs_event(BLOB_RENAME, NULL, table);
 299         }
 300 out:
 301         if (ret2 >= 0 && rmbd.pb.offset)
 302                 pass_buffer_as_shm(fd, SBD_OUTPUT, rmbd.pb.buf, rmbd.pb.offset);
 303         free(rmbd.pb.buf);
 304 }
 305
 306 static int com_rmblob(callback_function *f, struct command_context *cc)
 307 {
 308         if (cc->argc < 2)
 309                 return -E_MOOD_SYNTAX;
 310         return send_option_arg_callback_request(NULL, cc->argc - 1, cc->argv + 1, f,
 311                 afs_cb_result_handler, cc);
 312 }
 313
 314 static void com_addblob_callback(struct osl_table *table, int fd,
 315                 const struct osl_object *query)
 316 {
 317         struct osl_object objs[NUM_BLOB_COLUMNS];
 318         char *name = query->data, *msg;
 319         size_t name_len = strlen(name) + 1, msg_len;
 320         uint32_t id;
 321         unsigned num_rows;
 322         int ret;
 323
 324         ret = osl(osl_get_num_rows(table, &num_rows));
 325         if (ret < 0)
 326                 goto out;
 327         if (!num_rows) { /* this is the first entry ever added */
 328                 /* insert dummy row containing the id */
 329                 id = 2; /* this entry will be entry #1, so 2 is the next */
 330                 objs[BLOBCOL_ID].data = &id;
 331                 objs[BLOBCOL_ID].size = sizeof(id);
 332                 objs[BLOBCOL_NAME].data = "";
 333                 objs[BLOBCOL_NAME].size = 1;
 334                 objs[BLOBCOL_DEF].data = "";
 335                 objs[BLOBCOL_DEF].size = 1;
 336                 ret = osl(osl_add_row(table, objs));
 337                 if (ret < 0)
 338                         goto out;
 339         } else {
 340                 /* check if name already exists */
 341                 struct osl_row *row;
 342                 struct osl_object obj = {.data = name, .size = name_len};
 343                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 344                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 345                         goto out;
 346                 if (ret >= 0) { /* we already have a blob with this name */
 347                         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 348                         if (ret < 0)
 349                                 goto out;
 350                         id = *(uint32_t *)obj.data;
 351                         obj.data = name + name_len;
 352                         obj.size = query->size - name_len;
 353                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 354                         goto out;
 355                 }
 356                 /* new blob, get id of the dummy row and increment it */
 357                 obj.data = "";
 358                 obj.size = 1;
 359                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 360                 if (ret < 0)
 361                         goto out;
 362                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 363                 if (ret < 0)
 364                         goto out;
 365                 id = *(uint32_t *)obj.data + 1;
 366                 obj.data = &id;
 367                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 368                 if (ret < 0)
 369                         goto out;
 370         }
 371         id--;
 372         objs[BLOBCOL_ID].data = &id;
 373         objs[BLOBCOL_ID].size = sizeof(id);
 374         objs[BLOBCOL_NAME].data = name;
 375         objs[BLOBCOL_NAME].size = name_len;
 376         objs[BLOBCOL_DEF].data = name + name_len;
 377         objs[BLOBCOL_DEF].size = query->size - name_len;
 378         ret = osl(osl_add_row(table, objs));
 379         if (ret < 0)
 380                 goto out;
 381         afs_event(BLOB_ADD, NULL, table);
 382 out:
 383         if (ret < 0)
 384                 msg_len = xasprintf(&msg, "could not add %s: %s\n", name,
 385                         para_strerror(-ret));
 386         else
 387                 msg_len = xasprintf(&msg, "added %s as id %u\n", name, id);
 388         pass_buffer_as_shm(fd, SBD_OUTPUT, msg, msg_len);
 389         free(msg);
 390 }
 391
 392 /* Write input from fd to dynamically allocated buffer, but maximal 10M. */
 393 static int fd2buf(struct stream_cipher_context *scc, struct osl_object *obj)
 394 {
 395         size_t max_size = 10 * 1024 * 1024;
 396         int ret;
 397         struct iovec iov;
 398
 399         obj->data = NULL;
 400         obj->size = 0;
 401 again:
 402         do {
 403                 ret = recv_sb(scc, SBD_BLOB_DATA, max_size, &iov);
 404         } while (ret == 0);
 405
 406         if (ret < 0) {
 407                 free(obj->data);
 408                 obj->data = NULL;
 409                 obj->size = 0;
 410                 return ret;
 411         }
 412         if (iov.iov_len == 0) /* end of blob */
 413                 return 1;
 414         if (!obj->data) {
 415                 obj->data = iov.iov_base;
 416                 obj->size = iov.iov_len;
 417         } else {
 418                 obj->data = para_realloc(obj->data, obj->size + iov.iov_len);
 419                 memcpy(obj->data + obj->size, iov.iov_base, iov.iov_len);
 420                 obj->size += iov.iov_len;
 421                 free(iov.iov_base);
 422                 max_size -= iov.iov_len;
 423         }
 424         goto again;
 425         return 1;
 426 }
 427
 428 /*
 429  * Read data from a file descriptor, and send it to the afs process.
 430  *
 431  * \param cc Contains the file descriptor to read data from.
 432  * \param arg_obj Pointer to the arguments to \a f.
 433  * \param f The callback function.
 434  * \param result_handler See \ref send_callback_request.
 435  * \param private_result_data See \ref send_callback_request.
 436  *
 437  * This function is used by the addblob commands that instruct para_server to
 438  * store arbitrary data in a blob table. Input data is read and decrypted from
 439  * the file descriptor given by \a cc. This data is concatenated with the
 440  * buffer given by \a arg_obj, and the combined buffer is made available to the
 441  * afs process via the callback method. See \ref send_callback_request for
 442  * details.
 443  *
 444  * \return Negative on errors, the return value of the underlying call to
 445  * send_callback_request() otherwise.
 446  */
 447 static int stdin_command(struct command_context *cc, struct osl_object *arg_obj,
 448                 callback_function *f, callback_result_handler *result_handler,
 449                 void *private_result_data)
 450 {
 451         struct osl_object query, stdin_obj;
 452         int ret;
 453
 454         ret = send_sb(&cc->scc, NULL, 0, SBD_AWAITING_DATA, false);
 455         if (ret < 0)
 456                 return ret;
 457         ret = fd2buf(&cc->scc, &stdin_obj);
 458         if (ret < 0)
 459                 return ret;
 460         query.size = arg_obj->size + stdin_obj.size;
 461         query.data = para_malloc(query.size);
 462         memcpy(query.data, arg_obj->data, arg_obj->size);
 463         if (stdin_obj.size > 0)
 464                 memcpy((char *)query.data + arg_obj->size, stdin_obj.data,
 465                         stdin_obj.size);
 466         free(stdin_obj.data);
 467         ret = send_callback_request(f, &query, result_handler, private_result_data);
 468         free(query.data);
 469         return ret;
 470 }
 471
 472 static int com_addblob(callback_function *f, struct command_context *cc)
 473 {
 474         struct osl_object arg_obj;
 475
 476         if (cc->argc != 2)
 477                 return -E_BLOB_SYNTAX;
 478         if (!*cc->argv[1]) /* empty name is reserved for the dummy row */
 479                 return -E_BLOB_SYNTAX;
 480         arg_obj.size = strlen(cc->argv[1]) + 1;
 481         arg_obj.data = (char *)cc->argv[1];
 482         return stdin_command(cc, &arg_obj, f, afs_cb_result_handler, cc);
 483 }
 484
 485 /* FIXME: Print output to client, not to log file */
 486 static void com_mvblob_callback(struct osl_table *table, __a_unused int fd,
 487                 const struct osl_object *query)
 488 {
 489         char *src = (char *) query->data;
 490         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 491         char *dest = src + obj.size;
 492         struct osl_row *row;
 493         int ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 494
 495         if (ret < 0)
 496                 goto out;
 497         obj.data = dest;
 498         obj.size = strlen(dest) + 1;
 499         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 500         if (ret < 0)
 501                 goto out;
 502         afs_event(BLOB_RENAME, NULL, table);
 503 out:
 504         if (ret < 0)
 505                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 506 }
 507
 508 static int com_mvblob(callback_function *f, struct command_context *cc)
 509 {
 510         if (cc->argc != 3)
 511                 return -E_MOOD_SYNTAX;
 512         return send_option_arg_callback_request(NULL, cc->argc - 1,
 513                 cc->argv + 1, f, NULL, NULL);
 514 }
 515
 516 #define DEFINE_BLOB_COMMAND(cmd_name, table_name, cmd_prefix) \
 517         static void com_ ## cmd_name ## cmd_prefix ## _callback(int fd, const struct osl_object *query) \
 518         { \
 519                 return com_ ## cmd_name ## blob_callback(table_name ## _table, fd, query); \
 520         } \
 521         int com_ ## cmd_name ## cmd_prefix(struct command_context *cc) \
 522         { \
 523                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, cc); \
 524         }
 525
 526 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 527                 char **name)
 528 {
 529         struct osl_row *row;
 530         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 531         int ret;
 532
 533         *name = NULL;
 534         if (!id)
 535                 return 1;
 536         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 537         if (ret < 0)
 538                 return ret;
 539         ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 540         if (ret < 0)
 541                 return ret;
 542         *name = (char *)obj.data;
 543         return 1;
 544 }
 545
 546 /** Define the \p get_name_by_id function for this blob type. */
 547 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 548         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 549         { \
 550                 return blob_get_name_by_id(table_name ## _table, id, name); \
 551         }
 552
 553
 554 static int blob_get_def_by_name(struct osl_table *table, char *name,
 555                 struct osl_object *def)
 556 {
 557         struct osl_row *row;
 558         struct osl_object obj = {.data = name, .size = strlen(name) + 1};
 559         int ret;
 560
 561         def->data = NULL;
 562         if (!*name)
 563                 return 1;
 564         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 565         if (ret < 0)
 566                 return ret;
 567         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 568 }
 569
 570 /** Define the \p get_def_by_id function for this blob type. */
 571 #define DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix) \
 572         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def) \
 573         { \
 574                 return blob_get_def_by_name(table_name ## _table, name, def); \
 575         }
 576
 577 static int blob_get_def_by_id(struct osl_table *table, uint32_t id,
 578                 struct osl_object *def)
 579 {
 580         struct osl_row *row;
 581         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 582         int ret;
 583
 584         def->data = NULL;
 585         if (!id)
 586                 return 1;
 587         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 588         if (ret < 0)
 589                 return ret;
 590         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 591 }
 592
 593 /** Define the \p get_def_by_id function for this blob type. */
 594 #define DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix) \
 595         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def) \
 596         { \
 597                 return blob_get_def_by_id(table_name ## _table, id, def); \
 598         }
 599
 600 static int blob_get_name_and_def_by_row(struct osl_table *table,
 601                 const struct osl_row *row, char **name, struct osl_object *def)
 602 {
 603         struct osl_object obj;
 604         int ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 605         if (ret < 0)
 606                 return ret;
 607         *name = obj.data;
 608         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 609 }
 610 /** Define the \p get_name_and_def_by_row function for this blob type. */
 611 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 612         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 613                 char **name, struct osl_object *def) \
 614         { \
 615                 return blob_get_name_and_def_by_row(table_name ## _table, \
 616                         row, name, def); \
 617         }
 618
 619 /** Define the \p close function for this blob type. */
 620 #define DEFINE_BLOB_CLOSE(table_name) \
 621         static void table_name ## _close(void) \
 622         { \
 623                 osl_close_table(table_name ## _table, OSL_MARK_CLEAN); \
 624                 table_name ## _table = NULL; \
 625         }
 626
 627 /** Define the \p create function for this blob type. */
 628 #define DEFINE_BLOB_CREATE(table_name) \
 629         static int table_name ## _create(const char *dir) \
 630         { \
 631                 table_name ## _table_desc.dir = dir; \
 632                 return osl_create_table(&table_name ## _table_desc); \
 633         }
 634
 635 static int blob_open(struct osl_table **table,
 636                 struct osl_table_description *desc,
 637                 const char *dir)
 638 {
 639         int ret;
 640         desc->dir = dir;
 641         ret = osl(osl_open_table(desc, table));
 642         if (ret >= 0)
 643                 return ret;
 644         *table = NULL;
 645         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 646                 return 1;
 647         return ret;
 648 }
 649
 650 #define DEFINE_BLOB_OPEN(table_name) \
 651         static int table_name ## _open(const char *dir) \
 652         { \
 653                 return blob_open(&table_name ## _table, \
 654                         &table_name ## _table_desc, dir); \
 655         }
 656
 657
 658 /** Define the \p init function for this blob type. */
 659 #define DEFINE_BLOB_INIT(table_name) \
 660         void table_name ## _init(struct afs_table *t) \
 661         { \
 662                 t->open = table_name ## _open; \
 663                 t->close = table_name ## _close; \
 664                 t->create = table_name ## _create;\
 665                 t->event_handler = table_name ##_event_handler; \
 666                 table_name ## _table = NULL; \
 667         }
 668
 669
 670 /** Define all functions for this blob type. */
 671 #define DEFINE_BLOB_FUNCTIONS(table_name, cmd_prefix) \
 672         DEFINE_BLOB_OPEN(table_name) \
 673         DEFINE_BLOB_CLOSE(table_name) \
 674         DEFINE_BLOB_CREATE(table_name) \
 675         DEFINE_BLOB_INIT(table_name) \
 676         DEFINE_BLOB_COMMAND(ls, table_name, cmd_prefix) \
 677         DEFINE_BLOB_COMMAND(cat, table_name, cmd_prefix) \
 678         DEFINE_BLOB_COMMAND(add, table_name, cmd_prefix) \
 679         DEFINE_BLOB_COMMAND(rm, table_name, cmd_prefix) \
 680         DEFINE_BLOB_COMMAND(mv, table_name, cmd_prefix) \
 681         DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix); \
 682         DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix); \
 683         DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix); \
 684         DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix); \
 685
 686 /* doxygen isn't smart enough to recognize these */
 687 /** \cond blob_function */
 688 DEFINE_BLOB_FUNCTIONS(lyrics, lyr);
 689 DEFINE_BLOB_FUNCTIONS(images, img);
 690 DEFINE_BLOB_FUNCTIONS(moods, mood);
 691 DEFINE_BLOB_FUNCTIONS(playlists, pl);
 692 /** \endcond blob_function */