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.offset;
 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         int ret, i;
 180
 181         for (i = 1; i < argc; i++) {
 182                 const char *arg = argv[i];
 183                 if (arg[0] != '-')
 184                         break;
 185                 if (!strcmp(arg, "--")) {
 186                         i++;
 187                         break;
 188                 }
 189                 if (!strcmp(arg, "-i")) {
 190                         flags |= LSATT_FLAG_SORT_BY_ID;
 191                         continue;
 192                 }
 193                 if (!strcmp(arg, "-l")) {
 194                         flags |= LSATT_FLAG_LONG;
 195                         continue;
 196                 }
 197                 if (!strcmp(arg, "-r")) {
 198                         flags |= LSATT_FLAG_REVERSE;
 199                         continue;
 200                 }
 201         }
 202         ret = send_option_arg_callback_request(&options, argc - i, argv + i,
 203                 com_lsatt_callback, send_result, &fd);
 204         if (!ret) {
 205                 if (argc > 1)
 206                         ret = send_va_buffer(fd, "no matches\n");
 207         } else if (ret < 0)
 208                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 209         return ret;
 210 }
 211
 212 static int com_setatt_callback(const struct osl_object *query,
 213                 __a_unused struct osl_object *result)
 214 {
 215         char *p;
 216         uint64_t add_mask = 0, del_mask = 0;
 217         int ret;
 218         size_t len;
 219         struct osl_object obj;
 220         struct osl_row *row;
 221
 222         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 223                 char c;
 224
 225                 len = strlen(p);
 226                 if (!*p)
 227                         return -E_ATTR_SYNTAX;
 228                 c = p[len - 1];
 229                 if (c != '+' && c != '-')
 230                         break;
 231                 p[len - 1] = '\0';
 232                 obj.data = p;
 233                 obj.size = len + 1;
 234                 ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 235                 if (ret < 0)
 236                         return ret;
 237                 ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 238                         &obj);
 239                 if (ret < 0)
 240                         return ret;
 241                 if (c == '+')
 242                         add_mask |= (1UL << *(unsigned char *)obj.data);
 243                 else
 244                         del_mask |= (1UL << *(unsigned char *)obj.data);
 245         }
 246         if (!add_mask && !del_mask)
 247                 return -E_ATTR_SYNTAX;
 248         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 249                 (long long unsigned)del_mask);
 250         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 251                 struct afs_info old_afsi, new_afsi;
 252                 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
 253
 254                 len = strlen(p);
 255                 ret = aft_get_row_of_path(p, &aced.aft_row);
 256                 if (ret < 0)
 257                         return ret;
 258                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 259                 if (ret < 0)
 260                         return ret;
 261                 ret = load_afsi(&old_afsi, &obj);
 262                 if (ret < 0)
 263                         return ret;
 264                 new_afsi = old_afsi;
 265                 new_afsi.attributes |= add_mask;
 266                 new_afsi.attributes &= ~del_mask;
 267                 save_afsi(&new_afsi, &obj); /* in-place update */
 268                 afs_event(AFSI_CHANGE, NULL, &aced);
 269         }
 270         return 1;
 271 }
 272
 273 int com_setatt(__a_unused int fd, int argc, char * const * const argv)
 274 {
 275         if (argc < 3)
 276                 return -E_ATTR_SYNTAX;
 277         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 278                 NULL, NULL);
 279 }
 280
 281 struct addatt_event_data {
 282         const char *name;
 283         unsigned char bitnum;
 284 };
 285
 286
 287 static int com_addatt_callback(const struct osl_object *query,
 288                 struct osl_object *result)
 289 {
 290         char *p = query->data;
 291         int ret = 1;
 292         struct para_buffer pb = {.size = 0};
 293         size_t len;
 294
 295         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 296                 struct osl_object objs[NUM_ATT_COLUMNS];
 297                 struct osl_row *row;
 298                 unsigned char bitnum;
 299                 len = strlen(p);
 300                 struct addatt_event_data aed;
 301
 302                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 303                         para_printf(&pb, "invalid attribute name: %s\n", p);
 304                         continue;
 305                 }
 306                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 307                 if (ret >= 0) {
 308                         para_printf(&pb, "attribute \"%s\" already exists\n", p);
 309                         continue;
 310                 }
 311                 if (ret != -E_RB_KEY_NOT_FOUND) /* error */
 312                         goto out;
 313                 objs[ATTCOL_BITNUM].size = 1;
 314                 /* find smallest unused attribute */
 315                 for (bitnum = 0; bitnum < 64; bitnum++) {
 316                         objs[ATTCOL_BITNUM].data = &bitnum;
 317                         ret = osl_get_row(attribute_table, ATTCOL_BITNUM,
 318                                 &objs[ATTCOL_BITNUM], &row);
 319                         if (ret == -E_RB_KEY_NOT_FOUND)
 320                                 break; /* this bitnum is unused, use it */
 321                         if (ret < 0) /* error */
 322                                 goto out;
 323                         /* this bit is already in use, try next bit */
 324                 }
 325                 if (bitnum == 64) {
 326                         ret = -E_ATT_TABLE_FULL;
 327                         goto out;
 328                 }
 329                 objs[ATTCOL_NAME].data = p;
 330                 objs[ATTCOL_NAME].size = len + 1;
 331                 ret = osl_add_row(attribute_table, objs);
 332                 if (ret < 0)
 333                         goto out;
 334                 aed.name = p;
 335                 aed.bitnum = bitnum;
 336                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 337                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, bitnum);
 338         }
 339 out:
 340         if (ret < 0)
 341                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 342         result->data = pb.buf;
 343         result->size = pb.offset;
 344         return result->data? 0 : 1;
 345 }
 346
 347 int com_addatt(int fd, int argc, char * const * const argv)
 348 {
 349         int ret;
 350
 351         if (argc < 2)
 352                 return -E_ATTR_SYNTAX;
 353         ret = send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 354                 send_result, &fd);
 355         if (ret < 0)
 356                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 357         return ret;
 358 }
 359
 360 static int com_mvatt_callback(const struct osl_object *query,
 361                 struct osl_object *result)
 362 {
 363         char *old = query->data;
 364         size_t size = strlen(old) + 1;
 365         char *new = old + size;
 366         struct osl_object obj = {.data = old, .size = size};
 367         struct osl_row *row;
 368         struct para_buffer pb = {.size = 0};
 369         int ret;
 370
 371         ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 372         if (ret < 0)
 373                 goto out;
 374         obj.data = new;
 375         obj.size = strlen(new) + 1;
 376         ret = osl_update_object(attribute_table, row, ATTCOL_NAME, &obj);
 377 out:
 378         if (ret < 0)
 379                 para_printf(&pb, "%s\n", para_strerror(-ret));
 380         else
 381                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 382         if (!pb.buf)
 383                 return 0;
 384         result->data = pb.buf;
 385         result->size = pb.offset;
 386         return 1;
 387 }
 388
 389 int com_mvatt(int fd, int argc, char * const * const argv)
 390 {
 391         int ret;
 392
 393         if (argc != 3)
 394                 return -E_ATTR_SYNTAX;
 395         ret = send_standard_callback_request(argc - 1, argv + 1, com_mvatt_callback,
 396                 send_result, &fd);
 397         if (ret < 0)
 398                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 399         return ret;
 400 }
 401
 402 /** Data passed to the action handler of com_rmatt(). */
 403 struct remove_attribute_action_data {
 404         /** Message buffer. */
 405         struct para_buffer pb;
 406         /** Numver of attributes removed. */
 407         int num_removed;
 408         /** Bitwise "or" of the removed attributes. */
 409         uint64_t mask_of_removed_atts;
 410 };
 411
 412 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 413                 const char *name, void *data)
 414 {
 415         struct remove_attribute_action_data *raad = data;
 416         int ret;
 417         struct rmatt_event_data red = {.name = name};
 418
 419         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 420         if (ret < 0) {
 421                 para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 422                 return 1;
 423         }
 424         ret = osl_del_row(table, row);
 425         if (ret < 0) {
 426                 para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 427                 return 1;
 428         }
 429         para_printf(&raad->pb, "removed attribute %s\n", name);
 430         raad->num_removed++;
 431         raad->mask_of_removed_atts |= (1 << red.bitnum);
 432         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 433         return 1;
 434 }
 435
 436 static int com_rmatt_callback(const struct osl_object *query,
 437                 struct osl_object *result)
 438 {
 439         struct remove_attribute_action_data raad = {.num_removed = 0};
 440         int ret;
 441         struct pattern_match_data pmd = {
 442                 .table = attribute_table,
 443                 .patterns = *query,
 444                 .loop_col_num = ATTCOL_BITNUM,
 445                 .match_col_num = ATTCOL_NAME,
 446                 .data = &raad,
 447                 .action = remove_attribute
 448         };
 449         ret = for_each_matching_row(&pmd);
 450         if (ret < 0)
 451                 para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 452         if (!raad.num_removed)
 453                 para_printf(&raad.pb, "no match -- nothing removed\n");
 454         result->data = raad.pb.buf;
 455         result->size = raad.pb.offset;
 456         return 1;
 457 }
 458
 459 int com_rmatt(int fd, int argc, char * const * const argv)
 460 {
 461         int ret;
 462
 463         if (argc < 2)
 464                 return -E_ATTR_SYNTAX;
 465         ret = send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 466                 send_result, &fd);
 467         if (ret < 0)
 468                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 469         return ret;
 470 }
 471
 472 /**
 473  * Return a binary representation of the given attribute value.
 474  *
 475  * \param atts Pointer to the attribute value.
 476  * \param buf Result.
 477  *
 478  * This function prints a string of at most 64 characters plus the terminating
 479  * \p NULL character into \a buf which must be provided by the caller and at
 480  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 481  * used for unset attributes.
 482  *
 483  * In practice, not all 64 attributes are defined. In this case, the function
 484  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 485  * attribute.
 486  */
 487 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 488 {
 489         int i;
 490         const uint64_t one = 1;
 491
 492         for (i = 0; i <= greatest_att_bitnum; i++)
 493                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 494         buf[i] = '\0';
 495 }
 496
 497 /**
 498  * Get a string containing the set attributes in text form.
 499  *
 500  * \param atts The attribute bitmap.
 501  * \param delim The delimiter to separate matching attribute names.
 502  * \param text Result pointer.
 503  *
 504  * \return Positive on success, negative on errors. If no attributes have
 505  * been defined, \a *text is NULL.
 506  */
 507 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 508 {
 509         int i, ret;
 510         const uint64_t one = 1;
 511
 512         *text = NULL;
 513         if (greatest_att_bitnum < 0) { /* no attributes available */
 514                 *text = para_strdup("(no attributes available)");
 515                 return 1;
 516         }
 517         for (i = 0; i <= greatest_att_bitnum; i++) {
 518                 unsigned char bn = i;
 519                 struct osl_object obj = {.data = &bn, .size = 1};
 520                 struct osl_row *row;
 521
 522                 if (!(*atts & (one << i)))
 523                         continue;
 524                 ret = osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row);
 525                 if (ret < 0)
 526                         goto err;
 527                 ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &obj);
 528                 if (ret < 0)
 529                         goto err;
 530                 if (*text) {
 531                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 532                         free(*text);
 533                         *text = tmp;
 534                 } else
 535                         *text = para_strdup(obj.data);
 536         }
 537         if (!*text) /* no attributes set */
 538                 *text = para_strdup("");
 539         return 1;
 540 err:
 541         free(*text);
 542         return ret;
 543 }
 544
 545 /**
 546  * Close the attribute table.
 547  *
 548  * \sa osl_close_table().
 549  */
 550 void attribute_close(void)
 551 {
 552         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 553         attribute_table = NULL;
 554 }
 555
 556 /**
 557  * Open the attribute table.
 558  *
 559  * \param ti Gets initialized by this function.
 560  * \param db The database directory.
 561  *
 562  * \return Positive on success, negative on errors.
 563  *
 564  * \sa osl_open_table().
 565  */
 566 static int attribute_open(const char *dir)
 567 {
 568         int ret;
 569
 570         attribute_table_desc.dir = dir;
 571         ret = osl_open_table(&attribute_table_desc, &attribute_table);
 572         greatest_att_bitnum = -1; /* no atts available */
 573         if (ret >= 0) {
 574                 find_greatest_att_bitnum();
 575                 return ret;
 576         }
 577         attribute_table = NULL;
 578         if (ret >= 0 || is_errno(-ret, ENOENT))
 579                 return 1;
 580         return ret;
 581 }
 582
 583 static int attribute_create(const char *dir)
 584 {
 585         attribute_table_desc.dir = dir;
 586         return osl_create_table(&attribute_table_desc);
 587 }
 588
 589
 590 void attribute_init(struct afs_table *t)
 591 {
 592         t->name = attribute_table_desc.name;
 593         t->open = attribute_open;
 594         t->close = attribute_close;
 595         t->create = attribute_create;
 596 }