attribute.c

   1 /*
   2  * Copyright (C) 1997-2012 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
   9 #include <regex.h>
  10 #include <osl.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "crypt.h"
  15 #include "string.h"
  16 #include "afh.h"
  17 #include "afs.h"
  18 #include "ipc.h"
  19 #include "command.h"
  20
  21 static struct osl_table *attribute_table;
  22 static int greatest_att_bitnum;
  23
  24 /** The columns of the attribute table. */
  25 enum attribute_table_columns {
  26         /** The bit number (0-63). */
  27         ATTCOL_BITNUM,
  28         /** The name of the attribute. */
  29         ATTCOL_NAME,
  30         /** Number of columns in this table. */
  31         NUM_ATT_COLUMNS
  32 };
  33
  34 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  35 {
  36         const unsigned char *c1 = (const unsigned char*)obj1->data;
  37         const unsigned char *c2 = (const unsigned char*)obj2->data;
  38         if (*c1 > *c2)
  39                 return 1;
  40         if (*c1 < *c2)
  41                 return -1;
  42         return 0;
  43 }
  44
  45 static struct osl_column_description att_cols[] = {
  46         [ATTCOL_BITNUM] = {
  47                 .storage_type = OSL_MAPPED_STORAGE,
  48                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
  49                 .name = "bitnum",
  50                 .compare_function = char_compare,
  51                 .data_size = 1
  52         },
  53         [ATTCOL_NAME] = {
  54                 .storage_type = OSL_MAPPED_STORAGE,
  55                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  56                 .name = "name",
  57                 .compare_function = string_compare,
  58         }
  59 };
  60
  61 static struct osl_table_description attribute_table_desc = {
  62         .name = "attributes",
  63         .num_columns = NUM_ATT_COLUMNS,
  64         .flags = 0,
  65         .column_descriptions = att_cols
  66 };
  67
  68 static void find_greatest_att_bitnum(void)
  69 {
  70         unsigned char c = 63;
  71         do {
  72                 struct osl_row *row;
  73                 struct osl_object obj = {.data = &c, .size = 1};
  74                 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
  75                                 &row) >= 0) {
  76                         greatest_att_bitnum = c;
  77                         return;
  78                 }
  79         } while (c--);
  80         PARA_INFO_LOG("no attributes\n");
  81         greatest_att_bitnum = -E_NO_ATTRIBUTES;
  82 }
  83
  84 /**
  85  * Retrieve the identifier (number) of an attribute.
  86  *
  87  * \param att_name The name of the attribute.
  88  * \param bitnum Result pointer.
  89  *
  90  * \return Positive on success, negative on errors.
  91  */
  92 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
  93 {
  94         struct osl_object obj = {.data = (char *)att_name,
  95                 .size = strlen(att_name) + 1};
  96         struct osl_row *row;
  97         int ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
  98
  99         if (ret < 0)
 100                 return ret;
 101         ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj));
 102         if (ret < 0)
 103                 return ret;
 104         *bitnum = *(unsigned char *)obj.data;
 105         return 1;
 106 }
 107
 108 /**
 109  * Flags used by the lsatt command.
 110  *
 111  * \param \sa com_lsatt().
 112  */
 113 enum lsatt_flags {
 114         /** Whether "-a" was given for the lsatt command. */
 115         LSATT_FLAG_SORT_BY_ID = 1,
 116         /** Whether "-l" was given for the lsatt command. */
 117         LSATT_FLAG_LONG = 2,
 118         /** Reverse sort order. */
 119         LSATT_FLAG_REVERSE = 4
 120 };
 121
 122 /** Data passed to the action function of lsatt */
 123 struct lsatt_action_data {
 124         /** The result buffer. */
 125         struct para_buffer pb;
 126         /** The given flags for the lsatt command. */
 127         unsigned flags;
 128 };
 129
 130 static int print_attribute(struct osl_table *table, struct osl_row *row,
 131                 const char *name, void *data)
 132 {
 133         struct lsatt_action_data *laad = data;
 134         struct osl_object bitnum_obj;
 135         int ret;
 136
 137         if (!(laad->flags & LSATT_FLAG_LONG))
 138                 return para_printf(&laad->pb, "%s\n", name);
 139         ret = osl(osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj));
 140         if (ret < 0) {
 141                 para_printf(&laad->pb, "%s: %s\n", name, para_strerror(-ret));
 142                 return ret;
 143         }
 144         return para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
 145                 name);
 146 }
 147
 148 static void com_lsatt_callback(int fd, const struct osl_object *query)
 149 {
 150         struct lsatt_action_data laad = {
 151                 .flags = *(unsigned *) query->data,
 152                 .pb = {
 153                         .max_size = shm_get_shmmax(),
 154                         .private_data = &(struct afs_max_size_handler_data) {
 155                                 .fd = fd,
 156                         },
 157                         .max_size_handler = afs_max_size_handler
 158                 }
 159
 160         };
 161         struct pattern_match_data pmd = {
 162                 .table = attribute_table,
 163                 .loop_col_num = ATTCOL_BITNUM,
 164                 .match_col_num = ATTCOL_NAME,
 165                 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
 166                         .size = query->size - sizeof(laad.flags)},
 167                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
 168                 .data = &laad,
 169                 .action = print_attribute
 170         };
 171         if (laad.flags & LSATT_FLAG_SORT_BY_ID)
 172                 pmd.loop_col_num = ATTCOL_NAME;
 173         if (laad.flags & LSATT_FLAG_REVERSE)
 174                 pmd.pm_flags |= PM_REVERSE_LOOP;
 175         for_each_matching_row(&pmd);
 176         if (laad.pb.offset)
 177                 pass_buffer_as_shm(laad.pb.buf, laad.pb.offset, &fd);
 178         free(laad.pb.buf);
 179 }
 180
 181 int com_lsatt(struct command_context *cc)
 182 {
 183         unsigned flags = 0;
 184         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 185         int ret, i;
 186
 187         for (i = 1; i < cc->argc; i++) {
 188                 const char *arg = cc->argv[i];
 189                 if (arg[0] != '-')
 190                         break;
 191                 if (!strcmp(arg, "--")) {
 192                         i++;
 193                         break;
 194                 }
 195                 if (!strcmp(arg, "-i")) {
 196                         flags |= LSATT_FLAG_SORT_BY_ID;
 197                         continue;
 198                 }
 199                 if (!strcmp(arg, "-l")) {
 200                         flags |= LSATT_FLAG_LONG;
 201                         continue;
 202                 }
 203                 if (!strcmp(arg, "-r")) {
 204                         flags |= LSATT_FLAG_REVERSE;
 205                         continue;
 206                 }
 207         }
 208         ret = send_option_arg_callback_request(&options, cc->argc - i, cc->argv + i,
 209                 com_lsatt_callback, afs_cb_result_handler, cc);
 210         if (!ret) {
 211                 if (cc->argc > 1)
 212                         ret = sc_send_va_buffer(&cc->scc, "no matches\n");
 213         } else if (ret < 0)
 214                 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
 215         return ret;
 216 }
 217
 218 static void com_setatt_callback(__a_unused int fd, const struct osl_object *query)
 219 {
 220         char *p;
 221         uint64_t add_mask = 0, del_mask = 0;
 222         int ret;
 223         size_t len;
 224         struct osl_object obj;
 225         struct osl_row *row;
 226
 227         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 228                 char c;
 229
 230                 len = strlen(p);
 231                 ret = -E_ATTR_SYNTAX;
 232                 if (!*p)
 233                         goto out;
 234                 c = p[len - 1];
 235                 if (c != '+' && c != '-')
 236                         break;
 237                 p[len - 1] = '\0';
 238                 obj.data = p;
 239                 obj.size = len + 1;
 240                 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 241                 if (ret < 0)
 242                         goto out;
 243                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 244                         &obj));
 245                 if (ret < 0)
 246                         goto out;
 247                 if (c == '+')
 248                         add_mask |= (1UL << *(unsigned char *)obj.data);
 249                 else
 250                         del_mask |= (1UL << *(unsigned char *)obj.data);
 251         }
 252         ret = -E_ATTR_SYNTAX;
 253         if (!add_mask && !del_mask)
 254                 goto out;
 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                         goto out;
 265                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 266                 if (ret < 0)
 267                         goto out;
 268                 ret = load_afsi(&old_afsi, &obj);
 269                 if (ret < 0)
 270                         goto out;
 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 out:
 278         if (ret < 0)
 279                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 280 }
 281
 282 int com_setatt(struct command_context *cc)
 283 {
 284         if (cc->argc < 3)
 285                 return -E_ATTR_SYNTAX;
 286         return send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 287                 com_setatt_callback, NULL, NULL);
 288 }
 289
 290 struct addatt_event_data {
 291         const char *name;
 292         unsigned char bitnum;
 293 };
 294
 295
 296 static void com_addatt_callback(int fd, const struct osl_object *query)
 297 {
 298         char *p;
 299         int ret = 1, ret2 = 0;
 300         struct para_buffer pb = {
 301                 .max_size = shm_get_shmmax(),
 302                 .private_data = &(struct afs_max_size_handler_data) {
 303                         .fd = fd,
 304                 },
 305                 .max_size_handler = afs_max_size_handler
 306         };
 307         size_t len;
 308
 309         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 310                 struct osl_object objs[NUM_ATT_COLUMNS];
 311                 struct osl_row *row;
 312                 unsigned char bitnum;
 313                 struct addatt_event_data aed;
 314
 315                 len = strlen(p);
 316                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 317                         ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
 318                         if (ret2 < 0)
 319                                 goto out;
 320                         continue;
 321                 }
 322                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 323                 if (ret >= 0) {
 324                         ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
 325                         if (ret2 < 0)
 326                                 goto out;
 327                         continue;
 328                 }
 329                 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
 330                         goto out;
 331                 objs[ATTCOL_BITNUM].size = 1;
 332                 /* find smallest unused attribute */
 333                 for (bitnum = 0; bitnum < 64; bitnum++) {
 334                         objs[ATTCOL_BITNUM].data = &bitnum;
 335                         ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
 336                                 &objs[ATTCOL_BITNUM], &row));
 337                         if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 338                                 break; /* this bitnum is unused, use it */
 339                         if (ret < 0) /* error */
 340                                 goto out;
 341                         /* this bit is already in use, try next bit */
 342                 }
 343                 if (bitnum == 64) {
 344                         ret = -E_ATT_TABLE_FULL;
 345                         goto out;
 346                 }
 347                 objs[ATTCOL_NAME].data = p;
 348                 objs[ATTCOL_NAME].size = len + 1;
 349                 ret = osl(osl_add_row(attribute_table, objs));
 350                 if (ret < 0)
 351                         goto out;
 352                 aed.name = p;
 353                 aed.bitnum = bitnum;
 354                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 355                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
 356         }
 357 out:
 358         if (ret < 0 && ret2 >= 0)
 359                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 360         if (pb.offset)
 361                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 362         free(pb.buf);
 363 }
 364
 365 int com_addatt(struct command_context *cc)
 366 {
 367         int ret;
 368
 369         if (cc->argc < 2)
 370                 return -E_ATTR_SYNTAX;
 371         ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 372                 com_addatt_callback, afs_cb_result_handler, cc);
 373         if (ret < 0)
 374                 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
 375         return ret;
 376 }
 377
 378 static void com_mvatt_callback(int fd, const struct osl_object *query)
 379 {
 380         char *old = query->data;
 381         size_t size = strlen(old) + 1;
 382         char *new = old + size;
 383         struct osl_object obj = {.data = old, .size = size};
 384         struct osl_row *row;
 385         struct para_buffer pb = {
 386                 .max_size = shm_get_shmmax(),
 387                 .private_data = &(struct afs_max_size_handler_data) {
 388                         .fd = fd,
 389                 },
 390                 .max_size_handler = afs_max_size_handler,
 391         };
 392         int ret;
 393
 394         ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 395         if (ret < 0)
 396                 goto out;
 397         obj.data = new;
 398         obj.size = strlen(new) + 1;
 399         ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
 400 out:
 401         if (ret < 0)
 402                 para_printf(&pb, "%s\n", para_strerror(-ret));
 403         else
 404                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 405         if (pb.offset)
 406                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 407         free(pb.buf);
 408 }
 409
 410 int com_mvatt(struct command_context *cc)
 411 {
 412         int ret;
 413
 414         if (cc->argc != 3)
 415                 return -E_ATTR_SYNTAX;
 416         ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 417                 com_mvatt_callback, afs_cb_result_handler, cc);
 418         if (ret < 0)
 419                 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
 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                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 443         ret = osl(osl_del_row(table, row));
 444         if (ret < 0)
 445                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 446         ret = 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 ret;
 451 }
 452
 453 static void com_rmatt_callback(int fd, const struct osl_object *query)
 454 {
 455         struct remove_attribute_action_data raad = {
 456                 .num_removed = 0,
 457                 .pb = {
 458                         .max_size = shm_get_shmmax(),
 459                         .private_data = &(struct afs_max_size_handler_data) {
 460                                 .fd = fd,
 461                         },
 462                         .max_size_handler = afs_max_size_handler,
 463                 }
 464         };
 465         int ret, ret2 = 0;
 466         struct pattern_match_data pmd = {
 467                 .table = attribute_table,
 468                 .patterns = *query,
 469                 .loop_col_num = ATTCOL_BITNUM,
 470                 .match_col_num = ATTCOL_NAME,
 471                 .data = &raad,
 472                 .action = remove_attribute
 473         };
 474         ret = for_each_matching_row(&pmd);
 475         if (ret < 0)
 476                 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 477         else if (!raad.num_removed)
 478                 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
 479         if (ret2 >= 0 && raad.pb.offset)
 480                 pass_buffer_as_shm(raad.pb.buf, raad.pb.offset, &fd);
 481         free(raad.pb.buf);
 482 }
 483
 484 int com_rmatt(struct command_context *cc)
 485 {
 486         int ret;
 487
 488         if (cc->argc < 2)
 489                 return -E_ATTR_SYNTAX;
 490         ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 491                 com_rmatt_callback, afs_cb_result_handler, cc);
 492         if (ret < 0)
 493                 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
 494         return ret;
 495 }
 496
 497 /**
 498  * Return a binary representation of the given attribute value.
 499  *
 500  * \param atts Pointer to the attribute value.
 501  * \param buf Result.
 502  *
 503  * This function prints a string of at most 64 characters plus the terminating
 504  * \p NULL character into \a buf which must be provided by the caller and at
 505  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 506  * used for unset attributes.
 507  *
 508  * In practice, not all 64 attributes are defined. In this case, the function
 509  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 510  * attribute.
 511  */
 512 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 513 {
 514         int i;
 515         const uint64_t one = 1;
 516
 517         for (i = 0; i <= greatest_att_bitnum; i++)
 518                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 519         buf[i] = '\0';
 520 }
 521
 522 /**
 523  * Get a string containing the set attributes in text form.
 524  *
 525  * \param atts The attribute bitmap.
 526  * \param delim The delimiter to separate matching attribute names.
 527  * \param text Result pointer.
 528  *
 529  * \return Positive on success, negative on errors. If no attributes have
 530  * been defined, \a *text is NULL.
 531  */
 532 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 533 {
 534         int i, ret;
 535         const uint64_t one = 1;
 536
 537         *text = NULL;
 538         if (greatest_att_bitnum < 0) { /* no attributes available */
 539                 *text = para_strdup("(no attributes available)");
 540                 return 1;
 541         }
 542         for (i = 0; i <= greatest_att_bitnum; i++) {
 543                 unsigned char bn = i;
 544                 struct osl_object obj = {.data = &bn, .size = 1};
 545                 struct osl_row *row;
 546
 547                 if (!(*atts & (one << i)))
 548                         continue;
 549                 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
 550                 if (ret < 0)
 551                         goto err;
 552                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
 553                 if (ret < 0)
 554                         goto err;
 555                 if (*text) {
 556                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 557                         free(*text);
 558                         *text = tmp;
 559                 } else
 560                         *text = para_strdup(obj.data);
 561         }
 562         if (!*text) /* no attributes set */
 563                 *text = para_strdup("");
 564         return 1;
 565 err:
 566         free(*text);
 567         return ret;
 568 }
 569
 570 /**
 571  * Close the attribute table.
 572  *
 573  * \sa osl_close_table().
 574  */
 575 static void attribute_close(void)
 576 {
 577         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 578         attribute_table = NULL;
 579 }
 580
 581 /**
 582  * Open the attribute table.
 583  *
 584  * \param dir The database directory.
 585  *
 586  * \return Positive on success, negative on errors.
 587  *
 588  * \sa osl_open_table().
 589  */
 590 static int attribute_open(const char *dir)
 591 {
 592         int ret;
 593
 594         attribute_table_desc.dir = dir;
 595         ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
 596         greatest_att_bitnum = -1; /* no atts available */
 597         if (ret >= 0) {
 598                 find_greatest_att_bitnum();
 599                 return ret;
 600         }
 601         attribute_table = NULL;
 602         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 603                 return 1;
 604         return ret;
 605 }
 606
 607 static int attribute_create(const char *dir)
 608 {
 609         attribute_table_desc.dir = dir;
 610         return osl(osl_create_table(&attribute_table_desc));
 611 }
 612
 613 /**
 614  * Initialize the attribute table structure.
 615  *
 616  * \param t The table structure to initialize.
 617  */
 618 void attribute_init(struct afs_table *t)
 619 {
 620         t->open = attribute_open;
 621         t->close = attribute_close;
 622         t->create = attribute_create;
 623 }