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