blob.c

   1 /*
   2  * Copyright (C) 2007-2009 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 <fnmatch.h>
  10 #include <openssl/rc4.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 "net.h"
  20 #include "ipc.h"
  21 #include "portable_io.h"
  22
  23 /**
  24  * Compare two osl objects pointing to unsigned integers of 32 bit size.
  25  *
  26  * \param obj1 Pointer to the first integer.
  27  * \param obj2 Pointer to the second integer.
  28  *
  29  * \return The values required for an osl compare function.
  30  *
  31  * \sa osl_compare_func, osl_hash_compare().
  32  */
  33 static int uint32_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  34 {
  35         uint32_t d1 = read_u32((const char *)obj1->data);
  36         uint32_t d2 = read_u32((const char *)obj2->data);
  37
  38         if (d1 < d2)
  39                 return 1;
  40         if (d1 > d2)
  41                 return -1;
  42         return 0;
  43 }
  44
  45 static struct osl_column_description blob_cols[] = {
  46         [BLOBCOL_ID] = {
  47                 .storage_type = OSL_MAPPED_STORAGE,
  48                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  49                 .name = "id",
  50                 .data_size = 4,
  51                 .compare_function = uint32_compare
  52         },
  53         [BLOBCOL_NAME] = {
  54                 .storage_type = OSL_MAPPED_STORAGE,
  55                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  56                 .name = "name",
  57                 .compare_function = string_compare
  58         },
  59         [BLOBCOL_DEF] = {
  60                 .storage_type = OSL_DISK_STORAGE,
  61                 .storage_flags = 0,
  62                 .name = "definition"
  63         }
  64 };
  65
  66 /** \cond doxygen isn't smart enough to recognize these */
  67 INIT_BLOB_TABLE(lyrics);
  68 INIT_BLOB_TABLE(images);
  69 INIT_BLOB_TABLE(moods);
  70 INIT_BLOB_TABLE(playlists);
  71 /** \endcond */
  72
  73 /** Flags that may be passed to the \p ls functions of each blob  type. */
  74 enum blob_ls_flags {
  75         /** List both id and name. */
  76         BLOB_LS_FLAG_LONG = 1,
  77         /** Reverse sort order. */
  78         BLOB_LS_FLAG_REVERSE = 2,
  79         /** Sort by id instead of name. */
  80         BLOB_LS_FLAG_SORT_BY_ID = 4,
  81 };
  82
  83 /** Structure passed to the \p print_blob function. */
  84 struct lsblob_action_data {
  85         /** The flags given at the command line. */
  86         uint32_t flags;
  87         /** Message buffer. */
  88         struct para_buffer pb;
  89 };
  90
  91 static int print_blob(struct osl_table *table, struct osl_row *row,
  92                 const char *name, void *data)
  93 {
  94         struct lsblob_action_data *lbad = data;
  95         struct osl_object obj;
  96         uint32_t id;
  97         int ret;
  98
  99         if (!(lbad->flags & BLOB_LS_FLAG_LONG))
 100                 return para_printf(&lbad->pb, "%s\n", name);
 101         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 102         if (ret < 0) {
 103                 para_printf(&lbad->pb, "%s: %s\n", name, para_strerror(-ret));
 104                 return ret;
 105         }
 106         id = *(uint32_t *)obj.data;
 107         return para_printf(&lbad->pb, "%u\t%s\n", id, name);
 108 }
 109
 110 static void com_lsblob_callback(struct osl_table *table,
 111                 int fd, const struct osl_object *query)
 112 {
 113         struct lsblob_action_data lbad = {
 114                 .flags = *(uint32_t *)query->data,
 115                 .pb = {
 116                         .max_size = SHMMAX,
 117                         .private_data = &fd,
 118                         .max_size_handler = pass_buffer_as_shm
 119                 }
 120         };
 121         struct pattern_match_data pmd = {
 122                 .table = table,
 123                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
 124                         .size = query->size - sizeof(uint32_t)},
 125                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 126                 .match_col_num = BLOBCOL_NAME,
 127                 .data = &lbad,
 128                 .action = print_blob,
 129         };
 130         int ret;
 131
 132         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
 133                 pmd.pm_flags |= PM_REVERSE_LOOP;
 134         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 135                 pmd.loop_col_num = BLOBCOL_NAME;
 136         else
 137                 pmd.loop_col_num = BLOBCOL_ID;
 138         ret = for_each_matching_row(&pmd);
 139         if (ret < 0)
 140                 para_printf(&lbad.pb, "%s\n", para_strerror(-ret));
 141         if (lbad.pb.offset)
 142                 pass_buffer_as_shm(lbad.pb.buf, lbad.pb.offset, &fd);
 143         free(lbad.pb.buf);
 144 }
 145
 146 static int com_lsblob(callback_function *f, struct rc4_context *rc4c, int argc, char * const * const argv)
 147 {
 148         uint32_t flags = 0;
 149         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 150         int i;
 151
 152         for (i = 1; i < argc; i++) {
 153                 const char *arg = argv[i];
 154                 if (arg[0] != '-')
 155                         break;
 156                 if (!strcmp(arg, "--")) {
 157                         i++;
 158                         break;
 159                 }
 160                 if (!strcmp(arg, "-l")) {
 161                         flags |= BLOB_LS_FLAG_LONG;
 162                         continue;
 163                 }
 164                 if (!strcmp(arg, "-i")) {
 165                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 166                         continue;
 167                 }
 168                 if (!strcmp(arg, "-r")) {
 169                         flags |= BLOB_LS_FLAG_REVERSE;
 170                         continue;
 171                 }
 172                 break;
 173         }
 174 //      if (argc > i)
 175 //              return -E_BLOB_SYNTAX;
 176         return send_option_arg_callback_request(&options, argc - i,
 177                 argv + i, f, rc4_send_result, rc4c);
 178 }
 179
 180 static int cat_blob(struct osl_table *table, struct osl_row *row,
 181                 __a_unused const char *name, void *data)
 182 {
 183         int ret = 0, ret2;
 184         struct osl_object obj;
 185
 186         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 187         if (ret < 0)
 188                 return ret;
 189         if (obj.size)
 190                 ret = pass_buffer_as_shm(obj.data, obj.size, data);
 191         ret2 = osl(osl_close_disk_object(&obj));
 192         return (ret < 0)? ret : ret2;
 193 }
 194
 195 static void com_catblob_callback(struct osl_table *table, int fd,
 196                 const struct osl_object *query)
 197 {
 198         struct pattern_match_data pmd = {
 199                 .table = table,
 200                 .patterns = *query,
 201                 .loop_col_num = BLOBCOL_NAME,
 202                 .match_col_num = BLOBCOL_NAME,
 203                 .pm_flags = PM_SKIP_EMPTY_NAME,
 204                 .data = &fd,
 205                 .action = cat_blob
 206         };
 207         for_each_matching_row(&pmd);
 208 }
 209
 210 static int com_catblob(callback_function *f, struct rc4_context *rc4c, int argc,
 211                 char * const * const argv)
 212 {
 213         if (argc < 2)
 214                 return -E_BLOB_SYNTAX;
 215         return send_standard_callback_request(argc - 1, argv + 1, f,
 216                 rc4_send_result, rc4c);
 217 }
 218
 219 /** Used for removing rows from a blob table. */
 220 struct rmblob_data {
 221         /** Message buffer. */
 222         struct para_buffer pb;
 223         /** Number of removed blobs. */
 224         unsigned num_removed;
 225 };
 226
 227 static int remove_blob(struct osl_table *table, struct osl_row *row,
 228                 const char *name, void *data)
 229 {
 230         struct rmblob_data *rmbd = data;
 231         int ret = osl(osl_del_row(table, row));
 232         if (ret < 0) {
 233                 para_printf(&rmbd->pb, "%s: %s\n", name, para_strerror(-ret));
 234                 return ret;
 235         }
 236         rmbd->num_removed++;
 237         return 1;
 238 }
 239
 240 static void com_rmblob_callback(struct osl_table *table, int fd,
 241                 const struct osl_object *query)
 242 {
 243         int ret, ret2 = 0;
 244         struct rmblob_data rmbd = {
 245                 .num_removed = 0,
 246                 .pb = {
 247                         .max_size = SHMMAX,
 248                         .private_data = &fd,
 249                         .max_size_handler = pass_buffer_as_shm
 250                 }
 251         };
 252         struct pattern_match_data pmd = {
 253                 .table = table,
 254                 .patterns = *query,
 255                 .loop_col_num = BLOBCOL_NAME,
 256                 .match_col_num = BLOBCOL_NAME,
 257                 .pm_flags = PM_SKIP_EMPTY_NAME,
 258                 .data = &rmbd,
 259                 .action = remove_blob
 260         };
 261         ret = for_each_matching_row(&pmd);
 262         if (ret < 0) {
 263                 ret2 = para_printf(&rmbd.pb, "%s\n", para_strerror(-ret));
 264                 if (ret2 < 0)
 265                         goto out;
 266         }
 267         if (!rmbd.num_removed)
 268                 ret2 = para_printf(&rmbd.pb, "no matches, nothing removed\n");
 269         else {
 270                 ret2 = para_printf(&rmbd.pb, "removed %d blobs\n", rmbd.num_removed);
 271                 afs_event(BLOB_RENAME, NULL, table);
 272         }
 273 out:
 274         if (ret2 >= 0 && rmbd.pb.offset)
 275                 pass_buffer_as_shm(rmbd.pb.buf, rmbd.pb.offset, &fd);
 276         free(rmbd.pb.buf);
 277 }
 278
 279 static int com_rmblob(callback_function *f, struct rc4_context *rc4c, int argc,
 280                 char * const * const argv)
 281 {
 282         if (argc < 2)
 283                 return -E_MOOD_SYNTAX;
 284         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 285                 rc4_send_result, rc4c);
 286 }
 287
 288 static void com_addblob_callback(struct osl_table *table, __a_unused int fd,
 289                 const struct osl_object *query)
 290 {
 291         struct osl_object objs[NUM_BLOB_COLUMNS];
 292         char *name = query->data;
 293         size_t name_len = strlen(name) + 1;
 294         uint32_t id;
 295         unsigned num_rows;
 296         int ret;
 297
 298         ret = osl(osl_get_num_rows(table, &num_rows));
 299         if (ret < 0)
 300                 goto out;
 301         if (!num_rows) { /* this is the first entry ever added */
 302                 /* insert dummy row containing the id */
 303                 id = 2; /* this entry will be entry #1, so 2 is the next */
 304                 objs[BLOBCOL_ID].data = &id;
 305                 objs[BLOBCOL_ID].size = sizeof(id);
 306                 objs[BLOBCOL_NAME].data = "";
 307                 objs[BLOBCOL_NAME].size = 1;
 308                 objs[BLOBCOL_DEF].data = "";
 309                 objs[BLOBCOL_DEF].size = 1;
 310                 ret = osl(osl_add_row(table, objs));
 311                 if (ret < 0)
 312                         goto out;
 313         } else {
 314                 /* check if name already exists */
 315                 struct osl_row *row;
 316                 struct osl_object obj = {.data = name, .size = name_len};
 317                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 318                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 319                         goto out;
 320                 if (ret >= 0) { /* we already have a blob with this name */
 321                         obj.data = name + name_len;
 322                         obj.size = query->size - name_len;
 323                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 324                         goto out;
 325                 }
 326                 /* new blob, get id of the dummy row and increment it */
 327                 obj.data = "";
 328                 obj.size = 1;
 329                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 330                 if (ret < 0)
 331                         goto out;
 332                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 333                 if (ret < 0)
 334                         goto out;
 335                 id = *(uint32_t *)obj.data + 1;
 336                 obj.data = &id;
 337                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 338                 if (ret < 0)
 339                         goto out;
 340         }
 341         id--;
 342         objs[BLOBCOL_ID].data = &id;
 343         objs[BLOBCOL_ID].size = sizeof(id);
 344         objs[BLOBCOL_NAME].data = name;
 345         objs[BLOBCOL_NAME].size = name_len;
 346         objs[BLOBCOL_DEF].data = name + name_len;
 347         objs[BLOBCOL_DEF].size = query->size - name_len;
 348         ret = osl(osl_add_row(table, objs));
 349         if (ret < 0)
 350                 goto out;
 351         afs_event(BLOB_ADD, NULL, table);
 352 out:
 353         if (ret < 0)
 354                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 355 }
 356
 357 /*
 358  * write input from fd to dynamically allocated buffer,
 359  * but maximal max_size byte.
 360  */
 361 static int fd2buf(struct rc4_context *rc4c, unsigned max_size, struct osl_object *obj)
 362 {
 363         const size_t chunk_size = 1024;
 364         size_t size = 2048, received = 0;
 365         int ret;
 366         char *buf = para_malloc(size);
 367
 368         for (;;) {
 369                 ret = rc4_recv_bin_buffer(rc4c, buf + received, chunk_size);
 370                 if (ret <= 0)
 371                         break;
 372                 received += ret;
 373                 if (received + chunk_size >= size) {
 374                         size *= 2;
 375                         ret = -E_INPUT_TOO_LARGE;
 376                         if (size > max_size)
 377                                 break;
 378                         buf = para_realloc(buf, size);
 379                 }
 380         }
 381         obj->data = buf;
 382         obj->size = received;
 383         if (ret < 0)
 384                 free(buf);
 385         return ret;
 386 }
 387
 388 /*
 389  * Read data from a file descriptor, and send it to the afs process.
 390  *
 391  * \param rc4c crypt context containing the file descriptor to read data from.
 392  * \param arg_obj Pointer to the arguments to \a f.
 393  * \param f The callback function.
 394  * \param max_len Don't read more than that many bytes from stdin.
 395  * \param result_handler See \ref send_callback_request.
 396  * \param private_result_data See \ref send_callback_request.
 397  *
 398  * This function is used by commands that wish to let para_server store
 399  * arbitrary data specified by the user (for instance the add_blob family of
 400  * commands). First, at most \a max_len bytes are read and decrypted from the
 401  * file descriptor given by \a rc4c. The result is concatenated with the buffer
 402  * given by \a arg_obj, and the combined buffer is made available to the afs
 403  * process via the callback method. See \ref send_callback_request for details.
 404  *
 405  * \return Negative on errors, the return value of the underlying call to
 406  * send_callback_request() otherwise.
 407  */
 408 static int stdin_command(struct rc4_context *rc4c, struct osl_object *arg_obj,
 409                 callback_function *f, unsigned max_len,
 410                 callback_result_handler *result_handler,
 411                 void *private_result_data)
 412 {
 413         struct osl_object query, stdin_obj;
 414         int ret;
 415
 416         ret = rc4_send_buffer(rc4c, AWAITING_DATA_MSG);
 417         if (ret < 0)
 418                 return ret;
 419         ret = fd2buf(rc4c, max_len, &stdin_obj);
 420         if (ret < 0)
 421                 return ret;
 422         query.size = arg_obj->size + stdin_obj.size;
 423         query.data = para_malloc(query.size);
 424         memcpy(query.data, arg_obj->data, arg_obj->size);
 425         memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
 426         free(stdin_obj.data);
 427         ret = send_callback_request(f, &query, result_handler, private_result_data);
 428         free(query.data);
 429         return ret;
 430 }
 431
 432 static int com_addblob(callback_function *f, struct rc4_context *rc4c, int argc,
 433                 char * const * const argv)
 434 {
 435         struct osl_object arg_obj;
 436
 437         if (argc != 2)
 438                 return -E_BLOB_SYNTAX;
 439         if (!*argv[1]) /* empty name is reserved for the dummy row */
 440                 return -E_BLOB_SYNTAX;
 441         arg_obj.size = strlen(argv[1]) + 1;
 442         arg_obj.data = (char *)argv[1];
 443         return stdin_command(rc4c, &arg_obj, f, 10 * 1024 * 1024, NULL, NULL);
 444 }
 445
 446 /* FIXME: Print output to client, not to log file */
 447 static void com_mvblob_callback(struct osl_table *table, __a_unused int fd,
 448                 const struct osl_object *query)
 449 {
 450         char *src = (char *) query->data;
 451         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 452         char *dest = src + obj.size;
 453         struct osl_row *row;
 454         int ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 455
 456         if (ret < 0)
 457                 goto out;
 458         obj.data = dest;
 459         obj.size = strlen(dest) + 1;
 460         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 461         if (ret < 0)
 462                 goto out;
 463         afs_event(BLOB_RENAME, NULL, table);
 464 out:
 465         if (ret < 0)
 466                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 467 }
 468
 469 static int com_mvblob(callback_function *f, __a_unused struct rc4_context *rc4c,
 470                 int argc, char * const * const argv)
 471 {
 472         if (argc != 3)
 473                 return -E_MOOD_SYNTAX;
 474         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 475                 NULL, NULL);
 476 }
 477
 478 #define DEFINE_BLOB_COMMAND(cmd_name, table_name, cmd_prefix) \
 479         static void com_ ## cmd_name ## cmd_prefix ## _callback(int fd, const struct osl_object *query) \
 480         { \
 481                 return com_ ## cmd_name ## blob_callback(table_name ## _table, fd, query); \
 482         } \
 483         int com_ ## cmd_name ## cmd_prefix(struct rc4_context *rc4c, int argc, char * const * const argv) \
 484         { \
 485                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, rc4c, argc, argv); \
 486         }
 487
 488 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 489                 char **name)
 490 {
 491         struct osl_row *row;
 492         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 493         int ret;
 494
 495         *name = NULL;
 496         if (!id)
 497                 return 1;
 498         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 499         if (ret < 0)
 500                 return ret;
 501         ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 502         if (ret < 0)
 503                 return ret;
 504         *name = (char *)obj.data;
 505         return 1;
 506 }
 507
 508 /** Define the \p get_name_by_id function for this blob type. */
 509 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 510         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 511         { \
 512                 return blob_get_name_by_id(table_name ## _table, id, name); \
 513         }
 514
 515
 516 static int blob_get_def_by_name(struct osl_table *table, char *name,
 517                 struct osl_object *def)
 518 {
 519         struct osl_row *row;
 520         struct osl_object obj = {.data = name, .size = strlen(name) + 1};
 521         int ret;
 522
 523         def->data = NULL;
 524         if (!*name)
 525                 return 1;
 526         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 527         if (ret < 0)
 528                 return ret;
 529         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 530 }
 531
 532 /** Define the \p get_def_by_id function for this blob type. */
 533 #define DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix) \
 534         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def) \
 535         { \
 536                 return blob_get_def_by_name(table_name ## _table, name, def); \
 537         }
 538
 539 static int blob_get_def_by_id(struct osl_table *table, uint32_t id,
 540                 struct osl_object *def)
 541 {
 542         struct osl_row *row;
 543         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 544         int ret;
 545
 546         def->data = NULL;
 547         if (!id)
 548                 return 1;
 549         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 550         if (ret < 0)
 551                 return ret;
 552         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 553 }
 554
 555 /** Define the \p get_def_by_id function for this blob type. */
 556 #define DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix) \
 557         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def) \
 558         { \
 559                 return blob_get_def_by_id(table_name ## _table, id, def); \
 560         }
 561
 562 static int blob_get_name_and_def_by_row(struct osl_table *table,
 563                 const struct osl_row *row, char **name, struct osl_object *def)
 564 {
 565         struct osl_object obj;
 566         int ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 567         if (ret < 0)
 568                 return ret;
 569         *name = obj.data;
 570         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 571 }
 572 /** Define the \p get_name_and_def_by_row function for this blob type. */
 573 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 574         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 575                 char **name, struct osl_object *def) \
 576         { \
 577                 return blob_get_name_and_def_by_row(table_name ## _table, \
 578                         row, name, def); \
 579         }
 580
 581 /** Define the \p close function for this blob type. */
 582 #define DEFINE_BLOB_CLOSE(table_name) \
 583         void table_name ## _close(void) \
 584         { \
 585                 osl_close_table(table_name ## _table, OSL_MARK_CLEAN); \
 586                 table_name ## _table = NULL; \
 587         }
 588
 589 /** Define the \p create function for this blob type. */
 590 #define DEFINE_BLOB_CREATE(table_name) \
 591         int table_name ## _create(const char *dir) \
 592         { \
 593                 table_name ## _table_desc.dir = dir; \
 594                 return osl_create_table(&table_name ## _table_desc); \
 595         }
 596
 597 static int blob_open(struct osl_table **table,
 598                 struct osl_table_description *desc,
 599                 const char *dir)
 600 {
 601         int ret;
 602         desc->dir = dir;
 603         ret = osl(osl_open_table(desc, table));
 604         if (ret >= 0)
 605                 return ret;
 606         *table = NULL;
 607         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 608                 return 1;
 609         return ret;
 610 }
 611
 612 #define DEFINE_BLOB_OPEN(table_name) \
 613         int table_name ## _open(const char *dir) \
 614         { \
 615                 return blob_open(&table_name ## _table, \
 616                         &table_name ## _table_desc, dir); \
 617         }
 618
 619
 620 /** Define the \p init function for this blob type. */
 621 #define DEFINE_BLOB_INIT(table_name) \
 622         void table_name ## _init(struct afs_table *t) \
 623         { \
 624                 t->name = table_name ## _table_desc.name; \
 625                 t->open = table_name ## _open; \
 626                 t->close = table_name ## _close; \
 627                 t->create = table_name ## _create;\
 628                 t->event_handler = table_name ##_event_handler; \
 629                 table_name ## _table = NULL; \
 630         }
 631
 632
 633 /** Define all functions for this blob type. */
 634 #define DEFINE_BLOB_FUNCTIONS(table_name, cmd_prefix) \
 635         DEFINE_BLOB_OPEN(table_name) \
 636         DEFINE_BLOB_CLOSE(table_name) \
 637         DEFINE_BLOB_CREATE(table_name) \
 638         DEFINE_BLOB_INIT(table_name) \
 639         DEFINE_BLOB_COMMAND(ls, table_name, cmd_prefix) \
 640         DEFINE_BLOB_COMMAND(cat, table_name, cmd_prefix) \
 641         DEFINE_BLOB_COMMAND(add, table_name, cmd_prefix) \
 642         DEFINE_BLOB_COMMAND(rm, table_name, cmd_prefix) \
 643         DEFINE_BLOB_COMMAND(mv, table_name, cmd_prefix) \
 644         DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix); \
 645         DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix); \
 646         DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix); \
 647         DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix); \
 648
 649 /** \cond doxygen isn't smart enough to recognize these */
 650 DEFINE_BLOB_FUNCTIONS(lyrics, lyr);
 651 DEFINE_BLOB_FUNCTIONS(images, img);
 652 DEFINE_BLOB_FUNCTIONS(moods, mood);
 653 DEFINE_BLOB_FUNCTIONS(playlists, pl);
 654 /** \endcond */