attribute.c

   1 /*
   2  * Copyright (C) 1997-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file attribute.c Attribute handling functions. */
   8 #include "para.h"
   9 #include "error.h"
  10 #include "string.h"
  11 #include "afh.h"
  12 #include "afs.h"
  13 #include "net.h"
  14
  15 static struct osl_table *attribute_table;
  16 static int greatest_att_bitnum;
  17
  18 /** The columns of the attribute table. */
  19 enum attribute_table_columns {
  20         /** The bit number (0-63). */
  21         ATTCOL_BITNUM,
  22         /** The name of the attribute. */
  23         ATTCOL_NAME,
  24         /** Number of columns in this table. */
  25         NUM_ATT_COLUMNS
  26 };
  27
  28 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  29 {
  30         const unsigned char *c1 = (const unsigned char*)obj1->data;
  31         const unsigned char *c2 = (const unsigned char*)obj2->data;
  32         if (*c1 > *c2)
  33                 return 1;
  34         if (*c1 < *c2)
  35                 return -1;
  36         return 0;
  37 }
  38
  39 static struct osl_column_description att_cols[] = {
  40         [ATTCOL_BITNUM] = {
  41                 .storage_type = OSL_MAPPED_STORAGE,
  42                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
  43                 .name = "bitnum",
  44                 .compare_function = char_compare,
  45                 .data_size = 1
  46         },
  47         [ATTCOL_NAME] = {
  48                 .storage_type = OSL_MAPPED_STORAGE,
  49                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  50                 .name = "name",
  51                 .compare_function = string_compare,
  52         }
  53 };
  54
  55 static struct osl_table_description attribute_table_desc = {
  56         .name = "attributes",
  57         .num_columns = NUM_ATT_COLUMNS,
  58         .flags = 0,
  59         .column_descriptions = att_cols
  60 };
  61
  62 static void find_greatest_att_bitnum(void)
  63 {
  64         unsigned char c = 63;
  65         do {
  66                 struct osl_row *row;
  67                 struct osl_object obj = {.data = &c, .size = 1};
  68                 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
  69                                 &row) >= 0) {
  70                         greatest_att_bitnum = c;
  71                         return;
  72                 }
  73         } while (c--);
  74         PARA_INFO_LOG("no attributes\n");
  75         greatest_att_bitnum = -E_NO_ATTRIBUTES;
  76 }
  77
  78 /**
  79  * Retrieve the identifier (number) of an attribute.
  80  *
  81  * \param att_name The name of the attribute.
  82  * \param bitnum Result pointer.
  83  *
  84  * \return Positive on success, negative on errors.
  85  */
  86 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
  87 {
  88         struct osl_object obj = {.data = (char *)att_name,
  89                 .size = strlen(att_name) + 1};
  90         struct osl_row *row;
  91         int ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
  92
  93         if (ret < 0)
  94                 return ret;
  95         ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj);
  96         if (ret < 0)
  97                 return ret;
  98         *bitnum = *(unsigned char *)obj.data;
  99         return 1;
 100 }
 101
 102 /**
 103  * Flags used by the lsatt command.
 104  *
 105  * \param \sa com_lsatt().
 106  */
 107 enum lsatt_flags {
 108         /** Whether "-a" was given for the lsatt command. */
 109         LSATT_FLAG_SORT_BY_ID = 1,
 110         /** Whether "-l" was given for the lsatt command. */
 111         LSATT_FLAG_LONG = 2,
 112         /** Reverse sort order. */
 113         LSATT_FLAG_REVERSE = 4
 114 };
 115
 116 /** Data passed to the action function of lsatt */
 117 struct lsatt_action_data {
 118         /** The result buffer. */
 119         struct para_buffer pb;
 120         /** The given flags for the lsatt command. */
 121         unsigned flags;
 122 };
 123
 124 static int print_attribute(struct osl_table *table, struct osl_row *row,
 125                 const char *name, void *data)
 126 {
 127         struct lsatt_action_data *laad = data;
 128         struct osl_object bitnum_obj;
 129         int ret;
 130
 131         if (!(laad->flags & LSATT_FLAG_LONG)) {
 132                 para_printf(&laad->pb, "%s\n", name);
 133                 return 1;
 134         }
 135         ret = osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj);
 136         if (ret < 0) {
 137                 para_printf(&laad->pb, "%s: %s\n", name, para_strerror(-ret));
 138                 return ret;
 139         }
 140         para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
 141                 name);
 142         return 1;
 143 }
 144
 145 static int com_lsatt_callback(const struct osl_object *query,
 146                 struct osl_object *result)
 147 {
 148         struct lsatt_action_data laad = {.flags = *(unsigned *) query->data};
 149         struct pattern_match_data pmd = {
 150                 .table = attribute_table,
 151                 .loop_col_num = ATTCOL_BITNUM,
 152                 .match_col_num = ATTCOL_NAME,
 153                 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
 154                         .size = query->size - sizeof(laad.flags)},
 155                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
 156                 .data = &laad,
 157                 .action = print_attribute
 158         };
 159         int ret;
 160
 161         if (laad.flags & LSATT_FLAG_SORT_BY_ID)
 162                 pmd.loop_col_num = ATTCOL_NAME;
 163         if (laad.flags & LSATT_FLAG_REVERSE)
 164                 pmd.pm_flags |= PM_REVERSE_LOOP;
 165         ret = for_each_matching_row(&pmd);
 166         if (ret < 0)
 167                 para_printf(&laad.pb, "%s\n", para_strerror(-ret));
 168         if (!laad.pb.buf)
 169                 return 0;
 170         result->data = laad.pb.buf;
 171         result->size = laad.pb.size;
 172         return 1;
 173 }
 174
 175 int com_lsatt(int fd, int argc, char * const * const argv)
 176 {
 177         unsigned flags = 0;
 178         struct osl_object options = {.data = &flags, .size = sizeof(flags)},
 179                 result;
 180         int ret, i;
 181
 182         for (i = 1; i < argc; i++) {
 183                 const char *arg = argv[i];
 184                 if (arg[0] != '-')
 185                         break;
 186                 if (!strcmp(arg, "--")) {
 187                         i++;
 188                         break;
 189                 }
 190                 if (!strcmp(arg, "-i")) {
 191                         flags |= LSATT_FLAG_SORT_BY_ID;
 192                         continue;
 193                 }
 194                 if (!strcmp(arg, "-l")) {
 195                         flags |= LSATT_FLAG_LONG;
 196                         continue;
 197                 }
 198                 if (!strcmp(arg, "-r")) {
 199                         flags |= LSATT_FLAG_REVERSE;
 200                         continue;
 201                 }
 202         }
 203         ret = send_option_arg_callback_request(&options, argc - i, argv + i,
 204                 com_lsatt_callback, &result);
 205         if (!ret) {
 206                 if (argc > 1)
 207                         ret = send_va_buffer(fd, "no matches\n");
 208                 return ret;
 209         }
 210         if (ret < 0) {
 211                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 212                 return ret;
 213         }
 214         ret = send_buffer(fd, (char *)result.data);
 215         free(result.data);
 216         return ret;
 217 }
 218
 219 static int com_setatt_callback(const struct osl_object *query,
 220                 __a_unused struct osl_object *result)
 221 {
 222         char *p;
 223         uint64_t add_mask = 0, del_mask = 0;
 224         int ret;
 225         size_t len;
 226         struct osl_object obj;
 227         struct osl_row *row;
 228
 229         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 230                 char c;
 231
 232                 len = strlen(p);
 233                 if (!*p)
 234                         return -E_ATTR_SYNTAX;
 235                 c = p[len - 1];
 236                 if (c != '+' && c != '-')
 237                         break;
 238                 p[len - 1] = '\0';
 239                 obj.data = p;
 240                 obj.size = len + 1;
 241                 ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 242                 if (ret < 0)
 243                         return ret;
 244                 ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 245                         &obj);
 246                 if (ret < 0)
 247                         return ret;
 248                 if (c == '+')
 249                         add_mask |= (1UL << *(unsigned char *)obj.data);
 250                 else
 251                         del_mask |= (1UL << *(unsigned char *)obj.data);
 252         }
 253         if (!add_mask && !del_mask)
 254                 return -E_ATTR_SYNTAX;
 255         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 256                 (long long unsigned)del_mask);
 257         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 258                 struct afs_info old_afsi, new_afsi;
 259                 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
 260
 261                 len = strlen(p);
 262                 ret = aft_get_row_of_path(p, &aced.aft_row);
 263                 if (ret < 0)
 264                         return ret;
 265                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 266                 if (ret < 0)
 267                         return ret;
 268                 ret = load_afsi(&old_afsi, &obj);
 269                 if (ret < 0)
 270                         return ret;
 271                 new_afsi = old_afsi;
 272                 new_afsi.attributes |= add_mask;
 273                 new_afsi.attributes &= ~del_mask;
 274                 save_afsi(&new_afsi, &obj); /* in-place update */
 275                 afs_event(AFSI_CHANGE, NULL, &aced);
 276         }
 277         return 1;
 278 }
 279
 280 int com_setatt(__a_unused int fd, int argc, char * const * const argv)
 281 {
 282         if (argc < 3)
 283                 return -E_ATTR_SYNTAX;
 284         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 285                 NULL);
 286 }
 287
 288 struct addatt_event_data {
 289         const char *name;
 290         unsigned char bitnum;
 291 };
 292
 293
 294 static int com_addatt_callback(const struct osl_object *query,
 295                 struct osl_object *result)
 296 {
 297         char *p = query->data;
 298         int ret = 1;
 299         struct para_buffer pb = {.size = 0};
 300         size_t len;
 301
 302         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 303                 struct osl_object objs[NUM_ATT_COLUMNS];
 304                 struct osl_row *row;
 305                 unsigned char bitnum;
 306                 len = strlen(p);
 307                 struct addatt_event_data aed;
 308
 309                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 310                         para_printf(&pb, "invalid attribute name: %s\n", p);
 311                         continue;
 312                 }
 313                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 314                 if (ret >= 0) {
 315                         para_printf(&pb, "attribute \"%s\" already exists\n", p);
 316                         continue;
 317                 }
 318                 if (ret != -E_RB_KEY_NOT_FOUND) /* error */
 319                         goto out;
 320                 objs[ATTCOL_BITNUM].size = 1;
 321                 /* find smallest unused attribute */
 322                 for (bitnum = 0; bitnum < 64; bitnum++) {
 323                         objs[ATTCOL_BITNUM].data = &bitnum;
 324                         ret = osl_get_row(attribute_table, ATTCOL_BITNUM,
 325                                 &objs[ATTCOL_BITNUM], &row);
 326                         if (ret == -E_RB_KEY_NOT_FOUND)
 327                                 break; /* this bitnum is unused, use it */
 328                         if (ret < 0) /* error */
 329                                 goto out;
 330                         /* this bit is already in use, try next bit */
 331                 }
 332                 if (bitnum == 64) {
 333                         ret = -E_ATT_TABLE_FULL;
 334                         goto out;
 335                 }
 336                 objs[ATTCOL_NAME].data = p;
 337                 objs[ATTCOL_NAME].size = len + 1;
 338                 ret = osl_add_row(attribute_table, objs);
 339                 if (ret < 0)
 340                         goto out;
 341                 aed.name = p;
 342                 aed.bitnum = bitnum;
 343                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 344                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, bitnum);
 345         }
 346 out:
 347         if (ret < 0)
 348                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 349         result->data = pb.buf;
 350         result->size = pb.size;
 351         return result->data? 0 : 1;
 352 }
 353
 354 int com_addatt(int fd, int argc, char * const * const argv)
 355 {
 356         struct osl_object result;
 357         int ret;
 358
 359         if (argc < 2)
 360                 return -E_ATTR_SYNTAX;
 361         ret = send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 362                 &result);
 363         if (!ret)
 364                 return 1;
 365         if (ret < 0)
 366                 return ret;
 367         if (!result.data || !result.size)
 368                 return 1;
 369         ret =  send_va_buffer(fd, "%s", (char *) result.data);
 370         free(result.data);
 371         return ret;
 372 }
 373
 374 static int com_mvatt_callback(const struct osl_object *query,
 375                 struct osl_object *result)
 376 {
 377         char *old = query->data;
 378         size_t size = strlen(old) + 1;
 379         char *new = old + size;
 380         struct osl_object obj = {.data = old, .size = size};
 381         struct osl_row *row;
 382         struct para_buffer pb = {.size = 0};
 383         int ret;
 384
 385         ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 386         if (ret < 0)
 387                 goto out;
 388         obj.data = new;
 389         obj.size = strlen(new) + 1;
 390         ret = osl_update_object(attribute_table, row, ATTCOL_NAME, &obj);
 391 out:
 392         if (ret < 0)
 393                 para_printf(&pb, "%s\n", para_strerror(-ret));
 394         else
 395                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 396         if (!pb.buf)
 397                 return 0;
 398         result->data = pb.buf;
 399         result->size = pb.size;
 400         return 1;
 401 }
 402
 403 int com_mvatt(int fd, int argc, char * const * const argv)
 404 {
 405         struct osl_object result;
 406         int ret;
 407
 408         if (argc != 3)
 409                 return -E_ATTR_SYNTAX;
 410         ret = send_standard_callback_request(argc - 1, argv + 1, com_mvatt_callback,
 411                 &result);
 412         if (!ret)
 413                 return 1;
 414         if (ret < 0)
 415                 return ret;
 416         if (!result.data || !result.size)
 417                 return 1;
 418         ret =  send_va_buffer(fd, "%s", (char *) result.data);
 419         free(result.data);
 420         return ret;
 421 }
 422
 423 /** Data passed to the action handler of com_rmatt(). */
 424 struct remove_attribute_action_data {
 425         /** Message buffer. */
 426         struct para_buffer pb;
 427         /** Numver of attributes removed. */
 428         int num_removed;
 429         /** Bitwise "or" of the removed attributes. */
 430         uint64_t mask_of_removed_atts;
 431 };
 432
 433 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 434                 const char *name, void *data)
 435 {
 436         struct remove_attribute_action_data *raad = data;
 437         int ret;
 438         struct rmatt_event_data red = {.name = name};
 439
 440         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 441         if (ret < 0) {
 442                 para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 443                 return 1;
 444         }
 445         ret = osl_del_row(table, row);
 446         if (ret < 0) {
 447                 para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 448                 return 1;
 449         }
 450         para_printf(&raad->pb, "removed attribute %s\n", name);
 451         raad->num_removed++;
 452         raad->mask_of_removed_atts |= (1 << red.bitnum);
 453         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 454         return 1;
 455 }
 456
 457 static int com_rmatt_callback(const struct osl_object *query,
 458                 struct osl_object *result)
 459 {
 460         struct remove_attribute_action_data raad = {.num_removed = 0};
 461         int ret;
 462         struct pattern_match_data pmd = {
 463                 .table = attribute_table,
 464                 .patterns = *query,
 465                 .loop_col_num = ATTCOL_BITNUM,
 466                 .match_col_num = ATTCOL_NAME,
 467                 .data = &raad,
 468                 .action = remove_attribute
 469         };
 470         ret = for_each_matching_row(&pmd);
 471         if (ret < 0)
 472                 para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 473         if (!raad.num_removed)
 474                 para_printf(&raad.pb, "no match -- nothing removed\n");
 475         result->data = raad.pb.buf;
 476         result->size = raad.pb.size;
 477         return 1;
 478 }
 479
 480 int com_rmatt(int fd, int argc, char * const * const argv)
 481 {
 482         int ret;
 483         struct osl_object result;
 484
 485         if (argc < 2)
 486                 return -E_ATTR_SYNTAX;
 487         ret = send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 488                 &result);
 489         if (!ret)
 490                 return 0;
 491         if (ret < 0) {
 492                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 493                 return ret;
 494         }
 495         ret = send_buffer(fd, (char *)result.data);
 496         free(result.data);
 497         return ret;
 498 }
 499
 500 /**
 501  * Return a binary representation of the given attribute value.
 502  *
 503  * \param atts Pointer to the attribute value.
 504  * \param buf Result.
 505  *
 506  * This function prints a string of at most 64 characters plus the terminating
 507  * \p NULL character into \a buf which must be provided by the caller and at
 508  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 509  * used for unset attributes.
 510  *
 511  * In practice, not all 64 attributes are defined. In this case, the function
 512  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 513  * attribute.
 514  */
 515 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 516 {
 517         int i;
 518         const uint64_t one = 1;
 519
 520         for (i = 0; i <= greatest_att_bitnum; i++)
 521                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 522         buf[i] = '\0';
 523 }
 524
 525 /**
 526  * Get a string containing the set attributes in text form.
 527  *
 528  * \param atts The attribute bitmap.
 529  * \param delim The delimiter to separate matching attribute names.
 530  * \param text Result pointer.
 531  *
 532  * \return Positive on success, negative on errors. If no attributes have
 533  * been defined, \a *text is NULL.
 534  */
 535 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 536 {
 537         int i, ret;
 538         const uint64_t one = 1;
 539
 540         *text = NULL;
 541         if (greatest_att_bitnum < 0) { /* no attributes available */
 542                 *text = para_strdup("(no attributes available)");
 543                 return 1;
 544         }
 545         for (i = 0; i <= greatest_att_bitnum; i++) {
 546                 unsigned char bn = i;
 547                 struct osl_object obj = {.data = &bn, .size = 1};
 548                 struct osl_row *row;
 549
 550                 if (!(*atts & (one << i)))
 551                         continue;
 552                 ret = osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row);
 553                 if (ret < 0)
 554                         goto err;
 555                 ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &obj);
 556                 if (ret < 0)
 557                         goto err;
 558                 if (*text) {
 559                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 560                         free(*text);
 561                         *text = tmp;
 562                 } else
 563                         *text = para_strdup(obj.data);
 564         }
 565         if (!*text) /* no attributes set */
 566                 *text = para_strdup("");
 567         return 1;
 568 err:
 569         free(*text);
 570         return ret;
 571 }
 572
 573 /**
 574  * Close the attribute table.
 575  *
 576  * \sa osl_close_table().
 577  */
 578 void attribute_close(void)
 579 {
 580         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 581         attribute_table = NULL;
 582 }
 583
 584 /**
 585  * Open the attribute table.
 586  *
 587  * \param ti Gets initialized by this function.
 588  * \param db The database directory.
 589  *
 590  * \return Positive on success, negative on errors.
 591  *
 592  * \sa osl_open_table().
 593  */
 594 static int attribute_open(const char *dir)
 595 {
 596         int ret;
 597
 598         attribute_table_desc.dir = dir;
 599         ret = osl_open_table(&attribute_table_desc, &attribute_table);
 600         greatest_att_bitnum = -1; /* no atts available */
 601         if (ret >= 0) {
 602                 find_greatest_att_bitnum();
 603                 return ret;
 604         }
 605         attribute_table = NULL;
 606         if (ret >= 0 || is_errno(-ret, ENOENT))
 607                 return 1;
 608         return ret;
 609 }
 610
 611 static int attribute_create(const char *dir)
 612 {
 613         attribute_table_desc.dir = dir;
 614         return osl_create_table(&attribute_table_desc);
 615 }
 616
 617
 618 void attribute_init(struct afs_table *t)
 619 {
 620         t->name = attribute_table_desc.name;
 621         t->open = attribute_open;
 622         t->close = attribute_close;
 623         t->create = attribute_create;
 624 }