attribute.c

   1 /*
   2  * Copyright (C) 1997-2007 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 > 0) {
 206                 ret = send_buffer(fd, (char *)result.data);
 207                 free(result.data);
 208         } else if (ret < 0)
 209                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 210         else if (argc > 1)
 211                 send_va_buffer(fd, "no matches\n");
 212         return ret;
 213 }
 214
 215 static int com_setatt_callback(const struct osl_object *query,
 216                 __a_unused struct osl_object *result)
 217 {
 218         char *p;
 219         uint64_t add_mask = 0, del_mask = 0;
 220         int ret;
 221         size_t len;
 222         struct osl_object obj;
 223         struct osl_row *row;
 224
 225         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 226                 char c;
 227
 228                 len = strlen(p);
 229                 if (!*p)
 230                         return -E_ATTR_SYNTAX;
 231                 c = p[len - 1];
 232                 if (c != '+' && c != '-')
 233                         break;
 234                 p[len - 1] = '\0';
 235                 obj.data = p;
 236                 obj.size = len + 1;
 237                 ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 238                 if (ret < 0)
 239                         return ret;
 240                 ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 241                         &obj);
 242                 if (ret < 0)
 243                         return ret;
 244                 if (c == '+')
 245                         add_mask |= (1UL << *(unsigned char *)obj.data);
 246                 else
 247                         del_mask |= (1UL << *(unsigned char *)obj.data);
 248         }
 249         if (!add_mask && !del_mask)
 250                 return -E_ATTR_SYNTAX;
 251         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 252                 (long long unsigned)del_mask);
 253         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 254                 struct afs_info old_afsi, new_afsi;
 255                 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
 256
 257                 len = strlen(p);
 258                 ret = aft_get_row_of_path(p, &aced.aft_row);
 259                 if (ret < 0)
 260                         return ret;
 261                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 262                 if (ret < 0)
 263                         return ret;
 264                 ret = load_afsi(&old_afsi, &obj);
 265                 if (ret < 0)
 266                         return ret;
 267                 new_afsi = old_afsi;
 268                 new_afsi.attributes |= add_mask;
 269                 new_afsi.attributes &= ~del_mask;
 270                 save_afsi(&new_afsi, &obj); /* in-place update */
 271                 afs_event(AFSI_CHANGE, NULL, &aced);
 272         }
 273         return 1;
 274 }
 275
 276 int com_setatt(__a_unused int fd, int argc, char * const * const argv)
 277 {
 278         if (argc < 3)
 279                 return -E_ATTR_SYNTAX;
 280         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 281                 NULL);
 282 }
 283
 284 struct addatt_event_data {
 285         const char *name;
 286         unsigned char bitnum;
 287 };
 288
 289
 290 static int com_addatt_callback(const struct osl_object *query,
 291                 struct osl_object *result)
 292 {
 293         char *p = query->data;
 294         int ret = 1;
 295         struct para_buffer pb = {.size = 0};
 296         size_t len;
 297
 298         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 299                 struct osl_object objs[NUM_ATT_COLUMNS];
 300                 struct osl_row *row;
 301                 unsigned char bitnum;
 302                 len = strlen(p);
 303                 struct addatt_event_data aed;
 304
 305                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 306                         para_printf(&pb, "invalid attribute name: %s\n", p);
 307                         continue;
 308                 }
 309                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 310                 if (ret >= 0) {
 311                         para_printf(&pb, "attribute \"%s\" already exists\n", p);
 312                         continue;
 313                 }
 314                 if (ret != -E_RB_KEY_NOT_FOUND) /* error */
 315                         goto out;
 316                 objs[ATTCOL_BITNUM].size = 1;
 317                 /* find smallest unused attribute */
 318                 for (bitnum = 0; bitnum < 64; bitnum++) {
 319                         objs[ATTCOL_BITNUM].data = &bitnum;
 320                         ret = osl_get_row(attribute_table, ATTCOL_BITNUM,
 321                                 &objs[ATTCOL_BITNUM], &row);
 322                         if (ret == -E_RB_KEY_NOT_FOUND)
 323                                 break; /* this bitnum is unused, use it */
 324                         if (ret < 0) /* error */
 325                                 goto out;
 326                         /* this bit is already in use, try next bit */
 327                 }
 328                 if (bitnum == 64) {
 329                         ret = -E_ATT_TABLE_FULL;
 330                         goto out;
 331                 }
 332                 objs[ATTCOL_NAME].data = p;
 333                 objs[ATTCOL_NAME].size = len + 1;
 334                 ret = osl_add_row(attribute_table, objs);
 335                 if (ret < 0)
 336                         goto out;
 337                 aed.name = p;
 338                 aed.bitnum = bitnum;
 339                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 340                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, bitnum);
 341         }
 342 out:
 343         if (ret < 0)
 344                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 345         result->data = pb.buf;
 346         result->size = pb.size;
 347         return result->data? 0 : 1;
 348 }
 349
 350 int com_addatt(int fd, int argc, char * const * const argv)
 351 {
 352         struct osl_object result;
 353         int ret;
 354
 355         if (argc < 2)
 356                 return -E_ATTR_SYNTAX;
 357         ret = send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 358                 &result);
 359         if (!ret)
 360                 return 1;
 361         if (ret < 0)
 362                 return ret;
 363         if (!result.data || !result.size)
 364                 return 1;
 365         ret =  send_va_buffer(fd, "%s", (char *) result.data);
 366         free(result.data);
 367         return ret;
 368 }
 369
 370 static int com_mvatt_callback(const struct osl_object *query,
 371                 struct osl_object *result)
 372 {
 373         char *old = query->data;
 374         size_t size = strlen(old) + 1;
 375         char *new = old + size;
 376         struct osl_object obj = {.data = old, .size = size};
 377         struct osl_row *row;
 378         struct para_buffer pb = {.size = 0};
 379         int ret;
 380
 381         ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 382         if (ret < 0)
 383                 goto out;
 384         obj.data = new;
 385         obj.size = strlen(new) + 1;
 386         ret = osl_update_object(attribute_table, row, ATTCOL_NAME, &obj);
 387 out:
 388         if (ret < 0)
 389                 para_printf(&pb, "%s\n", para_strerror(-ret));
 390         else
 391                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 392         if (!pb.buf)
 393                 return 0;
 394         result->data = pb.buf;
 395         result->size = pb.size;
 396         return 1;
 397 }
 398
 399 int com_mvatt(int fd, int argc, char * const * const argv)
 400 {
 401         struct osl_object result;
 402         int ret;
 403
 404         if (argc != 3)
 405                 return -E_ATTR_SYNTAX;
 406         ret = send_standard_callback_request(argc - 1, argv + 1, com_mvatt_callback,
 407                 &result);
 408         if (!ret)
 409                 return 1;
 410         if (ret < 0)
 411                 return ret;
 412         if (!result.data || !result.size)
 413                 return 1;
 414         ret =  send_va_buffer(fd, "%s", (char *) result.data);
 415         free(result.data);
 416         return ret;
 417 }
 418
 419 /** Data passed to the action handler of com_rmatt(). */
 420 struct remove_attribute_action_data {
 421         /** Message buffer. */
 422         struct para_buffer pb;
 423         /** Numver of attributes removed. */
 424         int num_removed;
 425         /** Bitwise "or" of the removed attributes. */
 426         uint64_t mask_of_removed_atts;
 427 };
 428
 429 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 430                 const char *name, void *data)
 431 {
 432         struct remove_attribute_action_data *raad = data;
 433         int ret;
 434         struct rmatt_event_data red = {.name = name};
 435
 436         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 437         if (ret < 0) {
 438                 para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 439                 return 1;
 440         }
 441         ret = osl_del_row(table, row);
 442         if (ret < 0) {
 443                 para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 444                 return 1;
 445         }
 446         para_printf(&raad->pb, "removed attribute %s\n", name);
 447         raad->num_removed++;
 448         raad->mask_of_removed_atts |= (1 << red.bitnum);
 449         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 450         return 1;
 451 }
 452
 453 static int com_rmatt_callback(const struct osl_object *query,
 454                 struct osl_object *result)
 455 {
 456         struct remove_attribute_action_data raad = {.num_removed = 0};
 457         int ret;
 458         struct pattern_match_data pmd = {
 459                 .table = attribute_table,
 460                 .patterns = *query,
 461                 .loop_col_num = ATTCOL_BITNUM,
 462                 .match_col_num = ATTCOL_NAME,
 463                 .data = &raad,
 464                 .action = remove_attribute
 465         };
 466         ret = for_each_matching_row(&pmd);
 467         if (ret < 0)
 468                 para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 469         if (!raad.num_removed)
 470                 para_printf(&raad.pb, "no match -- nothing removed\n");
 471         result->data = raad.pb.buf;
 472         result->size = raad.pb.size;
 473         return 1;
 474 }
 475
 476 int com_rmatt(int fd, int argc, char * const * const argv)
 477 {
 478         int ret;
 479         struct osl_object result;
 480
 481         if (argc < 2)
 482                 return -E_ATTR_SYNTAX;
 483         ret = send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 484                 &result);
 485         if (ret > 0) {
 486                 send_buffer(fd, (char *)result.data);
 487                 free(result.data);
 488         } else
 489                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 490         return ret;
 491 }
 492
 493 /**
 494  * Return a binary representation of the given attribute value.
 495  *
 496  * \param atts Pointer to the attribute value.
 497  * \param buf Result.
 498  *
 499  * This function prints a string of at most 64 characters plus the terminating
 500  * \p NULL character into \a buf which must be provided by the caller and at
 501  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 502  * used for unset attributes.
 503  *
 504  * In practice, not all 64 attributes are defined. In this case, the function
 505  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 506  * attribute.
 507  */
 508 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 509 {
 510         int i;
 511         const uint64_t one = 1;
 512
 513         for (i = 0; i <= greatest_att_bitnum; i++)
 514                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 515         buf[i] = '\0';
 516 }
 517
 518 /**
 519  * Get a string containing the set attributes in text form.
 520  *
 521  * \param atts The attribute bitmap.
 522  * \param delim The delimiter to separate matching attribute names.
 523  * \param text Result pointer.
 524  *
 525  * \return Positive on success, negative on errors. If no attributes have
 526  * been defined, \a *text is NULL.
 527  */
 528 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 529 {
 530         int i, ret;
 531         const uint64_t one = 1;
 532
 533         *text = NULL;
 534         if (greatest_att_bitnum < 0) { /* no attributes available */
 535                 *text = para_strdup("(no attributes available)");
 536                 return 1;
 537         }
 538         for (i = 0; i <= greatest_att_bitnum; i++) {
 539                 unsigned char bn = i;
 540                 struct osl_object obj = {.data = &bn, .size = 1};
 541                 struct osl_row *row;
 542
 543                 if (!(*atts & (one << i)))
 544                         continue;
 545                 ret = osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row);
 546                 if (ret < 0)
 547                         goto err;
 548                 ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &obj);
 549                 if (ret < 0)
 550                         goto err;
 551                 if (*text) {
 552                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 553                         free(*text);
 554                         *text = tmp;
 555                 } else
 556                         *text = para_strdup(obj.data);
 557         }
 558         if (!*text) /* no attributes set */
 559                 *text = para_strdup("");
 560         return 1;
 561 err:
 562         free(*text);
 563         return ret;
 564 }
 565
 566 /**
 567  * Close the attribute table.
 568  *
 569  * \sa osl_close_table().
 570  */
 571 void attribute_close(void)
 572 {
 573         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 574         attribute_table = NULL;
 575 }
 576
 577 /**
 578  * Open the attribute table.
 579  *
 580  * \param ti Gets initialized by this function.
 581  * \param db The database directory.
 582  *
 583  * \return Positive on success, negative on errors.
 584  *
 585  * \sa osl_open_table().
 586  */
 587 static int attribute_open(const char *dir)
 588 {
 589         int ret;
 590
 591         attribute_table_desc.dir = dir;
 592         ret = osl_open_table(&attribute_table_desc, &attribute_table);
 593         greatest_att_bitnum = -1; /* no atts available */
 594         if (ret >= 0) {
 595                 find_greatest_att_bitnum();
 596                 return ret;
 597         }
 598         attribute_table = NULL;
 599         if (ret >= 0 || is_errno(-ret, ENOENT))
 600                 return 1;
 601         return ret;
 602 }
 603
 604 static int attribute_create(const char *dir)
 605 {
 606         attribute_table_desc.dir = dir;
 607         return osl_create_table(&attribute_table_desc);
 608 }
 609
 610
 611 void attribute_init(struct afs_table *t)
 612 {
 613         t->name = attribute_table_desc.name;
 614         t->open = attribute_open;
 615         t->close = attribute_close;
 616         t->create = attribute_create;
 617 }