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 <regex.h>
  10 #include <fnmatch.h>
  11 #include <openssl/rc4.h>
  12 #include <osl.h>
  13
  14 #include "para.h"
  15 #include "error.h"
  16 #include "crypt.h"
  17 #include "string.h"
  18 #include "afh.h"
  19 #include "afs.h"
  20 #include "net.h"
  21 #include "ipc.h"
  22 #include "portable_io.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 /** \cond doxygen isn't smart enough to recognize these */
  68 INIT_BLOB_TABLE(lyrics);
  69 INIT_BLOB_TABLE(images);
  70 INIT_BLOB_TABLE(moods);
  71 INIT_BLOB_TABLE(playlists);
  72 /** \endcond */
  73
  74 /** Flags that may be passed to the \p ls functions of each blob  type. */
  75 enum blob_ls_flags {
  76         /** List both id and name. */
  77         BLOB_LS_FLAG_LONG = 1,
  78         /** Reverse sort order. */
  79         BLOB_LS_FLAG_REVERSE = 2,
  80         /** Sort by id instead of name. */
  81         BLOB_LS_FLAG_SORT_BY_ID = 4,
  82 };
  83
  84 /** Structure passed to the \p print_blob function. */
  85 struct lsblob_action_data {
  86         /** The flags given at the command line. */
  87         uint32_t flags;
  88         /** Message buffer. */
  89         struct para_buffer pb;
  90 };
  91
  92 static int print_blob(struct osl_table *table, struct osl_row *row,
  93                 const char *name, void *data)
  94 {
  95         struct lsblob_action_data *lbad = data;
  96         struct osl_object obj;
  97         uint32_t id;
  98         int ret;
  99
 100         if (!(lbad->flags & BLOB_LS_FLAG_LONG))
 101                 return para_printf(&lbad->pb, "%s\n", name);
 102         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 103         if (ret < 0) {
 104                 para_printf(&lbad->pb, "%s: %s\n", name, para_strerror(-ret));
 105                 return ret;
 106         }
 107         id = *(uint32_t *)obj.data;
 108         return para_printf(&lbad->pb, "%u\t%s\n", id, name);
 109 }
 110
 111 static void com_lsblob_callback(struct osl_table *table,
 112                 int fd, const struct osl_object *query)
 113 {
 114         struct lsblob_action_data lbad = {
 115                 .flags = *(uint32_t *)query->data,
 116                 .pb = {
 117                         .max_size = SHMMAX,
 118                         .private_data = &fd,
 119                         .max_size_handler = pass_buffer_as_shm
 120                 }
 121         };
 122         struct pattern_match_data pmd = {
 123                 .table = table,
 124                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
 125                         .size = query->size - sizeof(uint32_t)},
 126                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 127                 .match_col_num = BLOBCOL_NAME,
 128                 .data = &lbad,
 129                 .action = print_blob,
 130         };
 131         int ret;
 132
 133         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
 134                 pmd.pm_flags |= PM_REVERSE_LOOP;
 135         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 136                 pmd.loop_col_num = BLOBCOL_NAME;
 137         else
 138                 pmd.loop_col_num = BLOBCOL_ID;
 139         ret = for_each_matching_row(&pmd);
 140         if (ret < 0)
 141                 para_printf(&lbad.pb, "%s\n", para_strerror(-ret));
 142         if (lbad.pb.offset)
 143                 pass_buffer_as_shm(lbad.pb.buf, lbad.pb.offset, &fd);
 144         free(lbad.pb.buf);
 145 }
 146
 147 static int com_lsblob(callback_function *f, struct rc4_context *rc4c, int argc, char * const * const argv)
 148 {
 149         uint32_t flags = 0;
 150         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 151         int i;
 152
 153         for (i = 1; i < argc; i++) {
 154                 const char *arg = argv[i];
 155                 if (arg[0] != '-')
 156                         break;
 157                 if (!strcmp(arg, "--")) {
 158                         i++;
 159                         break;
 160                 }
 161                 if (!strcmp(arg, "-l")) {
 162                         flags |= BLOB_LS_FLAG_LONG;
 163                         continue;
 164                 }
 165                 if (!strcmp(arg, "-i")) {
 166                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 167                         continue;
 168                 }
 169                 if (!strcmp(arg, "-r")) {
 170                         flags |= BLOB_LS_FLAG_REVERSE;
 171                         continue;
 172                 }
 173                 break;
 174         }
 175 //      if (argc > i)
 176 //              return -E_BLOB_SYNTAX;
 177         return send_option_arg_callback_request(&options, argc - i,
 178                 argv + i, f, rc4_send_result, rc4c);
 179 }
 180
 181 static int cat_blob(struct osl_table *table, struct osl_row *row,
 182                 __a_unused const char *name, void *data)
 183 {
 184         int ret = 0, ret2;
 185         struct osl_object obj;
 186
 187         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 188         if (ret < 0)
 189                 return ret;
 190         if (obj.size)
 191                 ret = pass_buffer_as_shm(obj.data, obj.size, data);
 192         ret2 = osl(osl_close_disk_object(&obj));
 193         return (ret < 0)? ret : ret2;
 194 }
 195
 196 static void com_catblob_callback(struct osl_table *table, int fd,
 197                 const struct osl_object *query)
 198 {
 199         struct pattern_match_data pmd = {
 200                 .table = table,
 201                 .patterns = *query,
 202                 .loop_col_num = BLOBCOL_NAME,
 203                 .match_col_num = BLOBCOL_NAME,
 204                 .pm_flags = PM_SKIP_EMPTY_NAME,
 205                 .data = &fd,
 206                 .action = cat_blob
 207         };
 208         for_each_matching_row(&pmd);
 209 }
 210
 211 static int com_catblob(callback_function *f, struct rc4_context *rc4c, int argc,
 212                 char * const * const argv)
 213 {
 214         if (argc < 2)
 215                 return -E_BLOB_SYNTAX;
 216         return send_standard_callback_request(argc - 1, argv + 1, f,
 217                 rc4_send_result, rc4c);
 218 }
 219
 220 /** Used for removing rows from a blob table. */
 221 struct rmblob_data {
 222         /** Message buffer. */
 223         struct para_buffer pb;
 224         /** Number of removed blobs. */
 225         unsigned num_removed;
 226 };
 227
 228 static int remove_blob(struct osl_table *table, struct osl_row *row,
 229                 const char *name, void *data)
 230 {
 231         struct rmblob_data *rmbd = data;
 232         int ret = osl(osl_del_row(table, row));
 233         if (ret < 0) {
 234                 para_printf(&rmbd->pb, "%s: %s\n", name, para_strerror(-ret));
 235                 return ret;
 236         }
 237         rmbd->num_removed++;
 238         return 1;
 239 }
 240
 241 static void com_rmblob_callback(struct osl_table *table, int fd,
 242                 const struct osl_object *query)
 243 {
 244         int ret, ret2 = 0;
 245         struct rmblob_data rmbd = {
 246                 .num_removed = 0,
 247                 .pb = {
 248                         .max_size = SHMMAX,
 249                         .private_data = &fd,
 250                         .max_size_handler = pass_buffer_as_shm
 251                 }
 252         };
 253         struct pattern_match_data pmd = {
 254                 .table = table,
 255                 .patterns = *query,
 256                 .loop_col_num = BLOBCOL_NAME,
 257                 .match_col_num = BLOBCOL_NAME,
 258                 .pm_flags = PM_SKIP_EMPTY_NAME,
 259                 .data = &rmbd,
 260                 .action = remove_blob
 261         };
 262         ret = for_each_matching_row(&pmd);
 263         if (ret < 0) {
 264                 ret2 = para_printf(&rmbd.pb, "%s\n", para_strerror(-ret));
 265                 if (ret2 < 0)
 266                         goto out;
 267         }
 268         if (!rmbd.num_removed)
 269                 ret2 = para_printf(&rmbd.pb, "no matches, nothing removed\n");
 270         else {
 271                 ret2 = para_printf(&rmbd.pb, "removed %d blobs\n", rmbd.num_removed);
 272                 afs_event(BLOB_RENAME, NULL, table);
 273         }
 274 out:
 275         if (ret2 >= 0 && rmbd.pb.offset)
 276                 pass_buffer_as_shm(rmbd.pb.buf, rmbd.pb.offset, &fd);
 277         free(rmbd.pb.buf);
 278 }
 279
 280 static int com_rmblob(callback_function *f, struct rc4_context *rc4c, int argc,
 281                 char * const * const argv)
 282 {
 283         if (argc < 2)
 284                 return -E_MOOD_SYNTAX;
 285         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 286                 rc4_send_result, rc4c);
 287 }
 288
 289 static void com_addblob_callback(struct osl_table *table, __a_unused int fd,
 290                 const struct osl_object *query)
 291 {
 292         struct osl_object objs[NUM_BLOB_COLUMNS];
 293         char *name = query->data;
 294         size_t name_len = strlen(name) + 1;
 295         uint32_t id;
 296         unsigned num_rows;
 297         int ret;
 298
 299         ret = osl(osl_get_num_rows(table, &num_rows));
 300         if (ret < 0)
 301                 goto out;
 302         if (!num_rows) { /* this is the first entry ever added */
 303                 /* insert dummy row containing the id */
 304                 id = 2; /* this entry will be entry #1, so 2 is the next */
 305                 objs[BLOBCOL_ID].data = &id;
 306                 objs[BLOBCOL_ID].size = sizeof(id);
 307                 objs[BLOBCOL_NAME].data = "";
 308                 objs[BLOBCOL_NAME].size = 1;
 309                 objs[BLOBCOL_DEF].data = "";
 310                 objs[BLOBCOL_DEF].size = 1;
 311                 ret = osl(osl_add_row(table, objs));
 312                 if (ret < 0)
 313                         goto out;
 314         } else {
 315                 /* check if name already exists */
 316                 struct osl_row *row;
 317                 struct osl_object obj = {.data = name, .size = name_len};
 318                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 319                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 320                         goto out;
 321                 if (ret >= 0) { /* we already have a blob with this name */
 322                         obj.data = name + name_len;
 323                         obj.size = query->size - name_len;
 324                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 325                         goto out;
 326                 }
 327                 /* new blob, get id of the dummy row and increment it */
 328                 obj.data = "";
 329                 obj.size = 1;
 330                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 331                 if (ret < 0)
 332                         goto out;
 333                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 334                 if (ret < 0)
 335                         goto out;
 336                 id = *(uint32_t *)obj.data + 1;
 337                 obj.data = &id;
 338                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 339                 if (ret < 0)
 340                         goto out;
 341         }
 342         id--;
 343         objs[BLOBCOL_ID].data = &id;
 344         objs[BLOBCOL_ID].size = sizeof(id);
 345         objs[BLOBCOL_NAME].data = name;
 346         objs[BLOBCOL_NAME].size = name_len;
 347         objs[BLOBCOL_DEF].data = name + name_len;
 348         objs[BLOBCOL_DEF].size = query->size - name_len;
 349         ret = osl(osl_add_row(table, objs));
 350         if (ret < 0)
 351                 goto out;
 352         afs_event(BLOB_ADD, NULL, table);
 353 out:
 354         if (ret < 0)
 355                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 356 }
 357
 358 /*
 359  * write input from fd to dynamically allocated buffer,
 360  * but maximal max_size byte.
 361  */
 362 static int fd2buf(struct rc4_context *rc4c, unsigned max_size, struct osl_object *obj)
 363 {
 364         const size_t chunk_size = 1024;
 365         size_t size = 2048, received = 0;
 366         int ret;
 367         char *buf = para_malloc(size);
 368
 369         for (;;) {
 370                 ret = rc4_recv_bin_buffer(rc4c, buf + received, chunk_size);
 371                 if (ret <= 0)
 372                         break;
 373                 received += ret;
 374                 if (received + chunk_size >= size) {
 375                         size *= 2;
 376                         ret = -E_INPUT_TOO_LARGE;
 377                         if (size > max_size)
 378                                 break;
 379                         buf = para_realloc(buf, size);
 380                 }
 381         }
 382         obj->data = buf;
 383         obj->size = received;
 384         if (ret < 0)
 385                 free(buf);
 386         return ret;
 387 }
 388
 389 /*
 390  * Read data from a file descriptor, and send it to the afs process.
 391  *
 392  * \param rc4c crypt context containing the file descriptor to read data from.
 393  * \param arg_obj Pointer to the arguments to \a f.
 394  * \param f The callback function.
 395  * \param max_len Don't read more than that many bytes from stdin.
 396  * \param result_handler See \ref send_callback_request.
 397  * \param private_result_data See \ref send_callback_request.
 398  *
 399  * This function is used by commands that wish to let para_server store
 400  * arbitrary data specified by the user (for instance the add_blob family of
 401  * commands). First, at most \a max_len bytes are read and decrypted from the
 402  * file descriptor given by \a rc4c. The result is concatenated with the buffer
 403  * given by \a arg_obj, and the combined buffer is made available to the afs
 404  * process via the callback method. See \ref send_callback_request for details.
 405  *
 406  * \return Negative on errors, the return value of the underlying call to
 407  * send_callback_request() otherwise.
 408  */
 409 static int stdin_command(struct rc4_context *rc4c, struct osl_object *arg_obj,
 410                 callback_function *f, unsigned max_len,
 411                 callback_result_handler *result_handler,
 412                 void *private_result_data)
 413 {
 414         struct osl_object query, stdin_obj;
 415         int ret;
 416
 417         ret = rc4_send_buffer(rc4c, AWAITING_DATA_MSG);
 418         if (ret < 0)
 419                 return ret;
 420         ret = fd2buf(rc4c, max_len, &stdin_obj);
 421         if (ret < 0)
 422                 return ret;
 423         query.size = arg_obj->size + stdin_obj.size;
 424         query.data = para_malloc(query.size);
 425         memcpy(query.data, arg_obj->data, arg_obj->size);
 426         memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
 427         free(stdin_obj.data);
 428         ret = send_callback_request(f, &query, result_handler, private_result_data);
 429         free(query.data);
 430         return ret;
 431 }
 432
 433 static int com_addblob(callback_function *f, struct rc4_context *rc4c, int argc,
 434                 char * const * const argv)
 435 {
 436         struct osl_object arg_obj;
 437
 438         if (argc != 2)
 439                 return -E_BLOB_SYNTAX;
 440         if (!*argv[1]) /* empty name is reserved for the dummy row */
 441                 return -E_BLOB_SYNTAX;
 442         arg_obj.size = strlen(argv[1]) + 1;
 443         arg_obj.data = (char *)argv[1];
 444         return stdin_command(rc4c, &arg_obj, f, 10 * 1024 * 1024, NULL, NULL);
 445 }
 446
 447 /* FIXME: Print output to client, not to log file */
 448 static void com_mvblob_callback(struct osl_table *table, __a_unused int fd,
 449                 const struct osl_object *query)
 450 {
 451         char *src = (char *) query->data;
 452         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 453         char *dest = src + obj.size;
 454         struct osl_row *row;
 455         int ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 456
 457         if (ret < 0)
 458                 goto out;
 459         obj.data = dest;
 460         obj.size = strlen(dest) + 1;
 461         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 462         if (ret < 0)
 463                 goto out;
 464         afs_event(BLOB_RENAME, NULL, table);
 465 out:
 466         if (ret < 0)
 467                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 468 }
 469
 470 static int com_mvblob(callback_function *f, __a_unused struct rc4_context *rc4c,
 471                 int argc, char * const * const argv)
 472 {
 473         if (argc != 3)
 474                 return -E_MOOD_SYNTAX;
 475         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 476                 NULL, NULL);
 477 }
 478
 479 #define DEFINE_BLOB_COMMAND(cmd_name, table_name, cmd_prefix) \
 480         static void com_ ## cmd_name ## cmd_prefix ## _callback(int fd, const struct osl_object *query) \
 481         { \
 482                 return com_ ## cmd_name ## blob_callback(table_name ## _table, fd, query); \
 483         } \
 484         int com_ ## cmd_name ## cmd_prefix(struct rc4_context *rc4c, int argc, char * const * const argv) \
 485         { \
 486                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, rc4c, argc, argv); \
 487         }
 488
 489 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 490                 char **name)
 491 {
 492         struct osl_row *row;
 493         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 494         int ret;
 495
 496         *name = NULL;
 497         if (!id)
 498                 return 1;
 499         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 500         if (ret < 0)
 501                 return ret;
 502         ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 503         if (ret < 0)
 504                 return ret;
 505         *name = (char *)obj.data;
 506         return 1;
 507 }
 508
 509 /** Define the \p get_name_by_id function for this blob type. */
 510 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 511         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 512         { \
 513                 return blob_get_name_by_id(table_name ## _table, id, name); \
 514         }
 515
 516
 517 static int blob_get_def_by_name(struct osl_table *table, char *name,
 518                 struct osl_object *def)
 519 {
 520         struct osl_row *row;
 521         struct osl_object obj = {.data = name, .size = strlen(name) + 1};
 522         int ret;
 523
 524         def->data = NULL;
 525         if (!*name)
 526                 return 1;
 527         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 528         if (ret < 0)
 529                 return ret;
 530         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 531 }
 532
 533 /** Define the \p get_def_by_id function for this blob type. */
 534 #define DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix) \
 535         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def) \
 536         { \
 537                 return blob_get_def_by_name(table_name ## _table, name, def); \
 538         }
 539
 540 static int blob_get_def_by_id(struct osl_table *table, uint32_t id,
 541                 struct osl_object *def)
 542 {
 543         struct osl_row *row;
 544         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 545         int ret;
 546
 547         def->data = NULL;
 548         if (!id)
 549                 return 1;
 550         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 551         if (ret < 0)
 552                 return ret;
 553         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 554 }
 555
 556 /** Define the \p get_def_by_id function for this blob type. */
 557 #define DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix) \
 558         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def) \
 559         { \
 560                 return blob_get_def_by_id(table_name ## _table, id, def); \
 561         }
 562
 563 static int blob_get_name_and_def_by_row(struct osl_table *table,
 564                 const struct osl_row *row, char **name, struct osl_object *def)
 565 {
 566         struct osl_object obj;
 567         int ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 568         if (ret < 0)
 569                 return ret;
 570         *name = obj.data;
 571         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 572 }
 573 /** Define the \p get_name_and_def_by_row function for this blob type. */
 574 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 575         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 576                 char **name, struct osl_object *def) \
 577         { \
 578                 return blob_get_name_and_def_by_row(table_name ## _table, \
 579                         row, name, def); \
 580         }
 581
 582 /** Define the \p close function for this blob type. */
 583 #define DEFINE_BLOB_CLOSE(table_name) \
 584         void table_name ## _close(void) \
 585         { \
 586                 osl_close_table(table_name ## _table, OSL_MARK_CLEAN); \
 587                 table_name ## _table = NULL; \
 588         }
 589
 590 /** Define the \p create function for this blob type. */
 591 #define DEFINE_BLOB_CREATE(table_name) \
 592         int table_name ## _create(const char *dir) \
 593         { \
 594                 table_name ## _table_desc.dir = dir; \
 595                 return osl_create_table(&table_name ## _table_desc); \
 596         }
 597
 598 static int blob_open(struct osl_table **table,
 599                 struct osl_table_description *desc,
 600                 const char *dir)
 601 {
 602         int ret;
 603         desc->dir = dir;
 604         ret = osl(osl_open_table(desc, table));
 605         if (ret >= 0)
 606                 return ret;
 607         *table = NULL;
 608         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 609                 return 1;
 610         return ret;
 611 }
 612
 613 #define DEFINE_BLOB_OPEN(table_name) \
 614         int table_name ## _open(const char *dir) \
 615         { \
 616                 return blob_open(&table_name ## _table, \
 617                         &table_name ## _table_desc, dir); \
 618         }
 619
 620
 621 /** Define the \p init function for this blob type. */
 622 #define DEFINE_BLOB_INIT(table_name) \
 623         void table_name ## _init(struct afs_table *t) \
 624         { \
 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 */