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 #include "ipc.h"
  15
  16 static struct osl_table *attribute_table;
  17 static int greatest_att_bitnum;
  18
  19 /** The columns of the attribute table. */
  20 enum attribute_table_columns {
  21         /** The bit number (0-63). */
  22         ATTCOL_BITNUM,
  23         /** The name of the attribute. */
  24         ATTCOL_NAME,
  25         /** Number of columns in this table. */
  26         NUM_ATT_COLUMNS
  27 };
  28
  29 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  30 {
  31         const unsigned char *c1 = (const unsigned char*)obj1->data;
  32         const unsigned char *c2 = (const unsigned char*)obj2->data;
  33         if (*c1 > *c2)
  34                 return 1;
  35         if (*c1 < *c2)
  36                 return -1;
  37         return 0;
  38 }
  39
  40 static struct osl_column_description att_cols[] = {
  41         [ATTCOL_BITNUM] = {
  42                 .storage_type = OSL_MAPPED_STORAGE,
  43                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
  44                 .name = "bitnum",
  45                 .compare_function = char_compare,
  46                 .data_size = 1
  47         },
  48         [ATTCOL_NAME] = {
  49                 .storage_type = OSL_MAPPED_STORAGE,
  50                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  51                 .name = "name",
  52                 .compare_function = string_compare,
  53         }
  54 };
  55
  56 static struct osl_table_description attribute_table_desc = {
  57         .name = "attributes",
  58         .num_columns = NUM_ATT_COLUMNS,
  59         .flags = 0,
  60         .column_descriptions = att_cols
  61 };
  62
  63 static void find_greatest_att_bitnum(void)
  64 {
  65         unsigned char c = 63;
  66         do {
  67                 struct osl_row *row;
  68                 struct osl_object obj = {.data = &c, .size = 1};
  69                 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
  70                                 &row) >= 0) {
  71                         greatest_att_bitnum = c;
  72                         return;
  73                 }
  74         } while (c--);
  75         PARA_INFO_LOG("no attributes\n");
  76         greatest_att_bitnum = -E_NO_ATTRIBUTES;
  77 }
  78
  79 /**
  80  * Retrieve the identifier (number) of an attribute.
  81  *
  82  * \param att_name The name of the attribute.
  83  * \param bitnum Result pointer.
  84  *
  85  * \return Positive on success, negative on errors.
  86  */
  87 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
  88 {
  89         struct osl_object obj = {.data = (char *)att_name,
  90                 .size = strlen(att_name) + 1};
  91         struct osl_row *row;
  92         int ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
  93
  94         if (ret < 0)
  95                 return ret;
  96         ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj);
  97         if (ret < 0)
  98                 return ret;
  99         *bitnum = *(unsigned char *)obj.data;
 100         return 1;
 101 }
 102
 103 /**
 104  * Flags used by the lsatt command.
 105  *
 106  * \param \sa com_lsatt().
 107  */
 108 enum lsatt_flags {
 109         /** Whether "-a" was given for the lsatt command. */
 110         LSATT_FLAG_SORT_BY_ID = 1,
 111         /** Whether "-l" was given for the lsatt command. */
 112         LSATT_FLAG_LONG = 2,
 113         /** Reverse sort order. */
 114         LSATT_FLAG_REVERSE = 4
 115 };
 116
 117 /** Data passed to the action function of lsatt */
 118 struct lsatt_action_data {
 119         /** The result buffer. */
 120         struct para_buffer pb;
 121         /** The given flags for the lsatt command. */
 122         unsigned flags;
 123 };
 124
 125 static int print_attribute(struct osl_table *table, struct osl_row *row,
 126                 const char *name, void *data)
 127 {
 128         struct lsatt_action_data *laad = data;
 129         struct osl_object bitnum_obj;
 130         int ret, ret2;
 131
 132         if (!(laad->flags & LSATT_FLAG_LONG))
 133                 return para_printf(&laad->pb, "%s\n", name);
 134         ret = osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj);
 135         if (ret < 0) {
 136                 ret2 = para_printf(&laad->pb, "%s: %s\n", name, para_strerror(-ret));
 137                 return ret;
 138         }
 139         return para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
 140                 name);
 141 }
 142
 143 static void com_lsatt_callback(int fd, const struct osl_object *query)
 144 {
 145         struct lsatt_action_data laad = {
 146                 .flags = *(unsigned *) query->data,
 147                 .pb = {
 148                         .max_size = SHMMAX,
 149                         .private_data = &fd,
 150                         .max_size_handler = pass_buffer_as_shm
 151                 }
 152
 153         };
 154         struct pattern_match_data pmd = {
 155                 .table = attribute_table,
 156                 .loop_col_num = ATTCOL_BITNUM,
 157                 .match_col_num = ATTCOL_NAME,
 158                 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
 159                         .size = query->size - sizeof(laad.flags)},
 160                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
 161                 .data = &laad,
 162                 .action = print_attribute
 163         };
 164         if (laad.flags & LSATT_FLAG_SORT_BY_ID)
 165                 pmd.loop_col_num = ATTCOL_NAME;
 166         if (laad.flags & LSATT_FLAG_REVERSE)
 167                 pmd.pm_flags |= PM_REVERSE_LOOP;
 168         for_each_matching_row(&pmd);
 169         if (laad.pb.offset)
 170                 pass_buffer_as_shm(laad.pb.buf, laad.pb.offset, &fd);
 171         free(laad.pb.buf);
 172 }
 173
 174 int com_lsatt(int fd, int argc, char * const * const argv)
 175 {
 176         unsigned flags = 0;
 177         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 178         int ret, i;
 179
 180         for (i = 1; i < argc; i++) {
 181                 const char *arg = argv[i];
 182                 if (arg[0] != '-')
 183                         break;
 184                 if (!strcmp(arg, "--")) {
 185                         i++;
 186                         break;
 187                 }
 188                 if (!strcmp(arg, "-i")) {
 189                         flags |= LSATT_FLAG_SORT_BY_ID;
 190                         continue;
 191                 }
 192                 if (!strcmp(arg, "-l")) {
 193                         flags |= LSATT_FLAG_LONG;
 194                         continue;
 195                 }
 196                 if (!strcmp(arg, "-r")) {
 197                         flags |= LSATT_FLAG_REVERSE;
 198                         continue;
 199                 }
 200         }
 201         ret = send_option_arg_callback_request(&options, argc - i, argv + i,
 202                 com_lsatt_callback, send_result, &fd);
 203         if (!ret) {
 204                 if (argc > 1)
 205                         ret = send_va_buffer(fd, "no matches\n");
 206         } else if (ret < 0)
 207                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 208         return ret;
 209 }
 210
 211 static void com_setatt_callback(__a_unused int fd, const struct osl_object *query)
 212 {
 213         char *p;
 214         uint64_t add_mask = 0, del_mask = 0;
 215         int ret;
 216         size_t len;
 217         struct osl_object obj;
 218         struct osl_row *row;
 219
 220         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 221                 char c;
 222
 223                 len = strlen(p);
 224                 ret = -E_ATTR_SYNTAX;
 225                 if (!*p)
 226                         goto out;
 227                 c = p[len - 1];
 228                 if (c != '+' && c != '-')
 229                         break;
 230                 p[len - 1] = '\0';
 231                 obj.data = p;
 232                 obj.size = len + 1;
 233                 ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 234                 if (ret < 0)
 235                         goto out;
 236                 ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 237                         &obj);
 238                 if (ret < 0)
 239                         goto out;
 240                 if (c == '+')
 241                         add_mask |= (1UL << *(unsigned char *)obj.data);
 242                 else
 243                         del_mask |= (1UL << *(unsigned char *)obj.data);
 244         }
 245         ret = -E_ATTR_SYNTAX;
 246         if (!add_mask && !del_mask)
 247                 goto out;
 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                         goto out;
 258                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 259                 if (ret < 0)
 260                         goto out;
 261                 ret = load_afsi(&old_afsi, &obj);
 262                 if (ret < 0)
 263                         goto out;
 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 out:
 271         if (ret < 0)
 272                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 273 }
 274
 275 int com_setatt(__a_unused int fd, int argc, char * const * const argv)
 276 {
 277         if (argc < 3)
 278                 return -E_ATTR_SYNTAX;
 279         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 280                 NULL, NULL);
 281 }
 282
 283 struct addatt_event_data {
 284         const char *name;
 285         unsigned char bitnum;
 286 };
 287
 288
 289 static void com_addatt_callback(int fd, const struct osl_object *query)
 290 {
 291         char *p = query->data;
 292         int ret = 1, ret2 = 0;
 293         struct para_buffer pb = {
 294                 .max_size = SHMMAX,
 295                 .private_data = &fd,
 296                 .max_size_handler = pass_buffer_as_shm
 297         };
 298         size_t len;
 299
 300         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 301                 struct osl_object objs[NUM_ATT_COLUMNS];
 302                 struct osl_row *row;
 303                 unsigned char bitnum;
 304                 struct addatt_event_data aed;
 305
 306                 len = strlen(p);
 307                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 308                         ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
 309                         if (ret2 < 0)
 310                                 goto out;
 311                         continue;
 312                 }
 313                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 314                 if (ret >= 0) {
 315                         ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
 316                         if (ret2 < 0)
 317                                 goto out;
 318                         continue;
 319                 }
 320                 if (ret != -E_RB_KEY_NOT_FOUND) /* error */
 321                         goto out;
 322                 objs[ATTCOL_BITNUM].size = 1;
 323                 /* find smallest unused attribute */
 324                 for (bitnum = 0; bitnum < 64; bitnum++) {
 325                         objs[ATTCOL_BITNUM].data = &bitnum;
 326                         ret = osl_get_row(attribute_table, ATTCOL_BITNUM,
 327                                 &objs[ATTCOL_BITNUM], &row);
 328                         if (ret == -E_RB_KEY_NOT_FOUND)
 329                                 break; /* this bitnum is unused, use it */
 330                         if (ret < 0) /* error */
 331                                 goto out;
 332                         /* this bit is already in use, try next bit */
 333                 }
 334                 if (bitnum == 64) {
 335                         ret = -E_ATT_TABLE_FULL;
 336                         goto out;
 337                 }
 338                 objs[ATTCOL_NAME].data = p;
 339                 objs[ATTCOL_NAME].size = len + 1;
 340                 ret = osl_add_row(attribute_table, objs);
 341                 if (ret < 0)
 342                         goto out;
 343                 aed.name = p;
 344                 aed.bitnum = bitnum;
 345                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 346                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
 347         }
 348 out:
 349         if (ret < 0 && ret2 >= 0)
 350                 ret = para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 351         if (pb.offset)
 352                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 353         free(pb.buf);
 354 }
 355
 356 int com_addatt(int fd, int argc, char * const * const argv)
 357 {
 358         int ret;
 359
 360         if (argc < 2)
 361                 return -E_ATTR_SYNTAX;
 362         ret = send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 363                 send_result, &fd);
 364         if (ret < 0)
 365                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 366         return ret;
 367 }
 368
 369 static void com_mvatt_callback(int fd, const struct osl_object *query)
 370 {
 371         char *old = query->data;
 372         size_t size = strlen(old) + 1;
 373         char *new = old + size;
 374         struct osl_object obj = {.data = old, .size = size};
 375         struct osl_row *row;
 376         struct para_buffer pb = {
 377                 .max_size = SHMMAX,
 378                 .private_data = &fd,
 379                 .max_size_handler = pass_buffer_as_shm
 380         };
 381         int ret;
 382
 383         ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 384         if (ret < 0)
 385                 goto out;
 386         obj.data = new;
 387         obj.size = strlen(new) + 1;
 388         ret = osl_update_object(attribute_table, row, ATTCOL_NAME, &obj);
 389 out:
 390         if (ret < 0)
 391                 ret = para_printf(&pb, "%s\n", para_strerror(-ret));
 392         else
 393                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 394         if (pb.offset)
 395                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 396         free(pb.buf);
 397 }
 398
 399 int com_mvatt(int fd, int argc, char * const * const argv)
 400 {
 401         int ret;
 402
 403         if (argc != 3)
 404                 return -E_ATTR_SYNTAX;
 405         ret = send_standard_callback_request(argc - 1, argv + 1, com_mvatt_callback,
 406                 send_result, &fd);
 407         if (ret < 0)
 408                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 409         return ret;
 410 }
 411
 412 /** Data passed to the action handler of com_rmatt(). */
 413 struct remove_attribute_action_data {
 414         /** Message buffer. */
 415         struct para_buffer pb;
 416         /** Numver of attributes removed. */
 417         int num_removed;
 418         /** Bitwise "or" of the removed attributes. */
 419         uint64_t mask_of_removed_atts;
 420 };
 421
 422 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 423                 const char *name, void *data)
 424 {
 425         struct remove_attribute_action_data *raad = data;
 426         int ret;
 427         struct rmatt_event_data red = {.name = name};
 428
 429         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 430         if (ret < 0)
 431                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 432         ret = osl_del_row(table, row);
 433         if (ret < 0)
 434                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 435         ret = para_printf(&raad->pb, "removed attribute %s\n", name);
 436         raad->num_removed++;
 437         raad->mask_of_removed_atts |= (1 << red.bitnum);
 438         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 439         return ret;
 440 }
 441
 442 static void com_rmatt_callback(int fd, const struct osl_object *query)
 443 {
 444         struct remove_attribute_action_data raad = {
 445                 .num_removed = 0,
 446                 .pb = {
 447                         .max_size = SHMMAX,
 448                         .private_data = &fd,
 449                         .max_size_handler = pass_buffer_as_shm
 450                 }
 451         };
 452         int ret, ret2 = 0;
 453         struct pattern_match_data pmd = {
 454                 .table = attribute_table,
 455                 .patterns = *query,
 456                 .loop_col_num = ATTCOL_BITNUM,
 457                 .match_col_num = ATTCOL_NAME,
 458                 .data = &raad,
 459                 .action = remove_attribute
 460         };
 461         ret = for_each_matching_row(&pmd);
 462         if (ret < 0)
 463                 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 464         else if (!raad.num_removed)
 465                 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
 466         if (ret2 >= 0 && raad.pb.offset)
 467                 pass_buffer_as_shm(raad.pb.buf, raad.pb.offset, &fd);
 468         free(raad.pb.buf);
 469 }
 470
 471 int com_rmatt(int fd, int argc, char * const * const argv)
 472 {
 473         int ret;
 474
 475         if (argc < 2)
 476                 return -E_ATTR_SYNTAX;
 477         ret = send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 478                 send_result, &fd);
 479         if (ret < 0)
 480                 send_va_buffer(fd, "%s\n", para_strerror(-ret));
 481         return ret;
 482 }
 483
 484 /**
 485  * Return a binary representation of the given attribute value.
 486  *
 487  * \param atts Pointer to the attribute value.
 488  * \param buf Result.
 489  *
 490  * This function prints a string of at most 64 characters plus the terminating
 491  * \p NULL character into \a buf which must be provided by the caller and at
 492  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 493  * used for unset attributes.
 494  *
 495  * In practice, not all 64 attributes are defined. In this case, the function
 496  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 497  * attribute.
 498  */
 499 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 500 {
 501         int i;
 502         const uint64_t one = 1;
 503
 504         for (i = 0; i <= greatest_att_bitnum; i++)
 505                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 506         buf[i] = '\0';
 507 }
 508
 509 /**
 510  * Get a string containing the set attributes in text form.
 511  *
 512  * \param atts The attribute bitmap.
 513  * \param delim The delimiter to separate matching attribute names.
 514  * \param text Result pointer.
 515  *
 516  * \return Positive on success, negative on errors. If no attributes have
 517  * been defined, \a *text is NULL.
 518  */
 519 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 520 {
 521         int i, ret;
 522         const uint64_t one = 1;
 523
 524         *text = NULL;
 525         if (greatest_att_bitnum < 0) { /* no attributes available */
 526                 *text = para_strdup("(no attributes available)");
 527                 return 1;
 528         }
 529         for (i = 0; i <= greatest_att_bitnum; i++) {
 530                 unsigned char bn = i;
 531                 struct osl_object obj = {.data = &bn, .size = 1};
 532                 struct osl_row *row;
 533
 534                 if (!(*atts & (one << i)))
 535                         continue;
 536                 ret = osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row);
 537                 if (ret < 0)
 538                         goto err;
 539                 ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &obj);
 540                 if (ret < 0)
 541                         goto err;
 542                 if (*text) {
 543                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 544                         free(*text);
 545                         *text = tmp;
 546                 } else
 547                         *text = para_strdup(obj.data);
 548         }
 549         if (!*text) /* no attributes set */
 550                 *text = para_strdup("");
 551         return 1;
 552 err:
 553         free(*text);
 554         return ret;
 555 }
 556
 557 /**
 558  * Close the attribute table.
 559  *
 560  * \sa osl_close_table().
 561  */
 562 void attribute_close(void)
 563 {
 564         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 565         attribute_table = NULL;
 566 }
 567
 568 /**
 569  * Open the attribute table.
 570  *
 571  * \param ti Gets initialized by this function.
 572  * \param db The database directory.
 573  *
 574  * \return Positive on success, negative on errors.
 575  *
 576  * \sa osl_open_table().
 577  */
 578 static int attribute_open(const char *dir)
 579 {
 580         int ret;
 581
 582         attribute_table_desc.dir = dir;
 583         ret = osl_open_table(&attribute_table_desc, &attribute_table);
 584         greatest_att_bitnum = -1; /* no atts available */
 585         if (ret >= 0) {
 586                 find_greatest_att_bitnum();
 587                 return ret;
 588         }
 589         attribute_table = NULL;
 590         if (ret >= 0 || is_errno(-ret, ENOENT))
 591                 return 1;
 592         return ret;
 593 }
 594
 595 static int attribute_create(const char *dir)
 596 {
 597         attribute_table_desc.dir = dir;
 598         return osl_create_table(&attribute_table_desc);
 599 }
 600
 601
 602 void attribute_init(struct afs_table *t)
 603 {
 604         t->name = attribute_table_desc.name;
 605         t->open = attribute_open;
 606         t->close = attribute_close;
 607         t->create = attribute_create;
 608 }