attribute.c

   1 /*
   2  * Copyright (C) 1997-2009 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 <openssl/rc4.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 "net.h"
  19 #include "ipc.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 = SHMMAX,
 154                         .private_data = &fd,
 155                         .max_size_handler = pass_buffer_as_shm
 156                 }
 157
 158         };
 159         struct pattern_match_data pmd = {
 160                 .table = attribute_table,
 161                 .loop_col_num = ATTCOL_BITNUM,
 162                 .match_col_num = ATTCOL_NAME,
 163                 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
 164                         .size = query->size - sizeof(laad.flags)},
 165                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
 166                 .data = &laad,
 167                 .action = print_attribute
 168         };
 169         if (laad.flags & LSATT_FLAG_SORT_BY_ID)
 170                 pmd.loop_col_num = ATTCOL_NAME;
 171         if (laad.flags & LSATT_FLAG_REVERSE)
 172                 pmd.pm_flags |= PM_REVERSE_LOOP;
 173         for_each_matching_row(&pmd);
 174         if (laad.pb.offset)
 175                 pass_buffer_as_shm(laad.pb.buf, laad.pb.offset, &fd);
 176         free(laad.pb.buf);
 177 }
 178
 179 int com_lsatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 180 {
 181         unsigned flags = 0;
 182         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 183         int ret, i;
 184
 185         for (i = 1; i < argc; i++) {
 186                 const char *arg = argv[i];
 187                 if (arg[0] != '-')
 188                         break;
 189                 if (!strcmp(arg, "--")) {
 190                         i++;
 191                         break;
 192                 }
 193                 if (!strcmp(arg, "-i")) {
 194                         flags |= LSATT_FLAG_SORT_BY_ID;
 195                         continue;
 196                 }
 197                 if (!strcmp(arg, "-l")) {
 198                         flags |= LSATT_FLAG_LONG;
 199                         continue;
 200                 }
 201                 if (!strcmp(arg, "-r")) {
 202                         flags |= LSATT_FLAG_REVERSE;
 203                         continue;
 204                 }
 205         }
 206         ret = send_option_arg_callback_request(&options, argc - i, argv + i,
 207                 com_lsatt_callback, rc4_send_result, rc4c);
 208         if (!ret) {
 209                 if (argc > 1)
 210                         ret = rc4_send_va_buffer(rc4c, "no matches\n");
 211         } else if (ret < 0)
 212                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 213         return ret;
 214 }
 215
 216 static void com_setatt_callback(__a_unused int fd, const struct osl_object *query)
 217 {
 218         char *p;
 219         uint64_t add_mask = 0, del_mask = 0;
 220         int ret;
 221         size_t len;
 222         struct osl_object obj;
 223         struct osl_row *row;
 224
 225         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 226                 char c;
 227
 228                 len = strlen(p);
 229                 ret = -E_ATTR_SYNTAX;
 230                 if (!*p)
 231                         goto out;
 232                 c = p[len - 1];
 233                 if (c != '+' && c != '-')
 234                         break;
 235                 p[len - 1] = '\0';
 236                 obj.data = p;
 237                 obj.size = len + 1;
 238                 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 239                 if (ret < 0)
 240                         goto out;
 241                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 242                         &obj));
 243                 if (ret < 0)
 244                         goto out;
 245                 if (c == '+')
 246                         add_mask |= (1UL << *(unsigned char *)obj.data);
 247                 else
 248                         del_mask |= (1UL << *(unsigned char *)obj.data);
 249         }
 250         ret = -E_ATTR_SYNTAX;
 251         if (!add_mask && !del_mask)
 252                 goto out;
 253         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 254                 (long long unsigned)del_mask);
 255         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 256                 struct afs_info old_afsi, new_afsi;
 257                 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
 258
 259                 len = strlen(p);
 260                 ret = aft_get_row_of_path(p, &aced.aft_row);
 261                 if (ret < 0)
 262                         goto out;
 263                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 264                 if (ret < 0)
 265                         goto out;
 266                 ret = load_afsi(&old_afsi, &obj);
 267                 if (ret < 0)
 268                         goto out;
 269                 new_afsi = old_afsi;
 270                 new_afsi.attributes |= add_mask;
 271                 new_afsi.attributes &= ~del_mask;
 272                 save_afsi(&new_afsi, &obj); /* in-place update */
 273                 afs_event(AFSI_CHANGE, NULL, &aced);
 274         }
 275 out:
 276         if (ret < 0)
 277                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 278 }
 279
 280 int com_setatt(__a_unused struct rc4_context *rc4c, int argc, char * const * const argv)
 281 {
 282         if (argc < 3)
 283                 return -E_ATTR_SYNTAX;
 284         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 285                 NULL, NULL);
 286 }
 287
 288 struct addatt_event_data {
 289         const char *name;
 290         unsigned char bitnum;
 291 };
 292
 293
 294 static void com_addatt_callback(int fd, const struct osl_object *query)
 295 {
 296         char *p;
 297         int ret = 1, ret2 = 0;
 298         struct para_buffer pb = {
 299                 .max_size = SHMMAX,
 300                 .private_data = &fd,
 301                 .max_size_handler = pass_buffer_as_shm
 302         };
 303         size_t len;
 304
 305         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 306                 struct osl_object objs[NUM_ATT_COLUMNS];
 307                 struct osl_row *row;
 308                 unsigned char bitnum;
 309                 struct addatt_event_data aed;
 310
 311                 len = strlen(p);
 312                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 313                         ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
 314                         if (ret2 < 0)
 315                                 goto out;
 316                         continue;
 317                 }
 318                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 319                 if (ret >= 0) {
 320                         ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
 321                         if (ret2 < 0)
 322                                 goto out;
 323                         continue;
 324                 }
 325                 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
 326                         goto out;
 327                 objs[ATTCOL_BITNUM].size = 1;
 328                 /* find smallest unused attribute */
 329                 for (bitnum = 0; bitnum < 64; bitnum++) {
 330                         objs[ATTCOL_BITNUM].data = &bitnum;
 331                         ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
 332                                 &objs[ATTCOL_BITNUM], &row));
 333                         if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 334                                 break; /* this bitnum is unused, use it */
 335                         if (ret < 0) /* error */
 336                                 goto out;
 337                         /* this bit is already in use, try next bit */
 338                 }
 339                 if (bitnum == 64) {
 340                         ret = -E_ATT_TABLE_FULL;
 341                         goto out;
 342                 }
 343                 objs[ATTCOL_NAME].data = p;
 344                 objs[ATTCOL_NAME].size = len + 1;
 345                 ret = osl(osl_add_row(attribute_table, objs));
 346                 if (ret < 0)
 347                         goto out;
 348                 aed.name = p;
 349                 aed.bitnum = bitnum;
 350                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 351                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
 352         }
 353 out:
 354         if (ret < 0 && ret2 >= 0)
 355                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 356         if (pb.offset)
 357                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 358         free(pb.buf);
 359 }
 360
 361 int com_addatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 362 {
 363         int ret;
 364
 365         if (argc < 2)
 366                 return -E_ATTR_SYNTAX;
 367         ret = send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 368                 rc4_send_result, rc4c);
 369         if (ret < 0)
 370                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 371         return ret;
 372 }
 373
 374 static void com_mvatt_callback(int fd, const struct osl_object *query)
 375 {
 376         char *old = query->data;
 377         size_t size = strlen(old) + 1;
 378         char *new = old + size;
 379         struct osl_object obj = {.data = old, .size = size};
 380         struct osl_row *row;
 381         struct para_buffer pb = {
 382                 .max_size = SHMMAX,
 383                 .private_data = &fd,
 384                 .max_size_handler = pass_buffer_as_shm
 385         };
 386         int ret;
 387
 388         ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 389         if (ret < 0)
 390                 goto out;
 391         obj.data = new;
 392         obj.size = strlen(new) + 1;
 393         ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
 394 out:
 395         if (ret < 0)
 396                 para_printf(&pb, "%s\n", para_strerror(-ret));
 397         else
 398                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 399         if (pb.offset)
 400                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 401         free(pb.buf);
 402 }
 403
 404 int com_mvatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 405 {
 406         int ret;
 407
 408         if (argc != 3)
 409                 return -E_ATTR_SYNTAX;
 410         ret = send_standard_callback_request(argc - 1, argv + 1, com_mvatt_callback,
 411                 rc4_send_result, rc4c);
 412         if (ret < 0)
 413                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 414         return ret;
 415 }
 416
 417 /** Data passed to the action handler of com_rmatt(). */
 418 struct remove_attribute_action_data {
 419         /** Message buffer. */
 420         struct para_buffer pb;
 421         /** Numver of attributes removed. */
 422         int num_removed;
 423         /** Bitwise "or" of the removed attributes. */
 424         uint64_t mask_of_removed_atts;
 425 };
 426
 427 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 428                 const char *name, void *data)
 429 {
 430         struct remove_attribute_action_data *raad = data;
 431         int ret;
 432         struct rmatt_event_data red = {.name = name};
 433
 434         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 435         if (ret < 0)
 436                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 437         ret = osl(osl_del_row(table, row));
 438         if (ret < 0)
 439                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 440         ret = para_printf(&raad->pb, "removed attribute %s\n", name);
 441         raad->num_removed++;
 442         raad->mask_of_removed_atts |= (1 << red.bitnum);
 443         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 444         return ret;
 445 }
 446
 447 static void com_rmatt_callback(int fd, const struct osl_object *query)
 448 {
 449         struct remove_attribute_action_data raad = {
 450                 .num_removed = 0,
 451                 .pb = {
 452                         .max_size = SHMMAX,
 453                         .private_data = &fd,
 454                         .max_size_handler = pass_buffer_as_shm
 455                 }
 456         };
 457         int ret, ret2 = 0;
 458         struct pattern_match_data pmd = {
 459                 .table = attribute_table,
 460                 .patterns = *query,
 461                 .loop_col_num = ATTCOL_BITNUM,
 462                 .match_col_num = ATTCOL_NAME,
 463                 .data = &raad,
 464                 .action = remove_attribute
 465         };
 466         ret = for_each_matching_row(&pmd);
 467         if (ret < 0)
 468                 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 469         else if (!raad.num_removed)
 470                 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
 471         if (ret2 >= 0 && raad.pb.offset)
 472                 pass_buffer_as_shm(raad.pb.buf, raad.pb.offset, &fd);
 473         free(raad.pb.buf);
 474 }
 475
 476 int com_rmatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 477 {
 478         int ret;
 479
 480         if (argc < 2)
 481                 return -E_ATTR_SYNTAX;
 482         ret = send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 483                 rc4_send_result, rc4c);
 484         if (ret < 0)
 485                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 486         return ret;
 487 }
 488
 489 /**
 490  * Return a binary representation of the given attribute value.
 491  *
 492  * \param atts Pointer to the attribute value.
 493  * \param buf Result.
 494  *
 495  * This function prints a string of at most 64 characters plus the terminating
 496  * \p NULL character into \a buf which must be provided by the caller and at
 497  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 498  * used for unset attributes.
 499  *
 500  * In practice, not all 64 attributes are defined. In this case, the function
 501  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 502  * attribute.
 503  */
 504 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 505 {
 506         int i;
 507         const uint64_t one = 1;
 508
 509         for (i = 0; i <= greatest_att_bitnum; i++)
 510                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 511         buf[i] = '\0';
 512 }
 513
 514 /**
 515  * Get a string containing the set attributes in text form.
 516  *
 517  * \param atts The attribute bitmap.
 518  * \param delim The delimiter to separate matching attribute names.
 519  * \param text Result pointer.
 520  *
 521  * \return Positive on success, negative on errors. If no attributes have
 522  * been defined, \a *text is NULL.
 523  */
 524 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 525 {
 526         int i, ret;
 527         const uint64_t one = 1;
 528
 529         *text = NULL;
 530         if (greatest_att_bitnum < 0) { /* no attributes available */
 531                 *text = para_strdup("(no attributes available)");
 532                 return 1;
 533         }
 534         for (i = 0; i <= greatest_att_bitnum; i++) {
 535                 unsigned char bn = i;
 536                 struct osl_object obj = {.data = &bn, .size = 1};
 537                 struct osl_row *row;
 538
 539                 if (!(*atts & (one << i)))
 540                         continue;
 541                 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
 542                 if (ret < 0)
 543                         goto err;
 544                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
 545                 if (ret < 0)
 546                         goto err;
 547                 if (*text) {
 548                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 549                         free(*text);
 550                         *text = tmp;
 551                 } else
 552                         *text = para_strdup(obj.data);
 553         }
 554         if (!*text) /* no attributes set */
 555                 *text = para_strdup("");
 556         return 1;
 557 err:
 558         free(*text);
 559         return ret;
 560 }
 561
 562 /**
 563  * Close the attribute table.
 564  *
 565  * \sa osl_close_table().
 566  */
 567 void attribute_close(void)
 568 {
 569         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 570         attribute_table = NULL;
 571 }
 572
 573 /**
 574  * Open the attribute table.
 575  *
 576  * \param dir The database directory.
 577  *
 578  * \return Positive on success, negative on errors.
 579  *
 580  * \sa osl_open_table().
 581  */
 582 static int attribute_open(const char *dir)
 583 {
 584         int ret;
 585
 586         attribute_table_desc.dir = dir;
 587         ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
 588         greatest_att_bitnum = -1; /* no atts available */
 589         if (ret >= 0) {
 590                 find_greatest_att_bitnum();
 591                 return ret;
 592         }
 593         attribute_table = NULL;
 594         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 595                 return 1;
 596         return ret;
 597 }
 598
 599 static int attribute_create(const char *dir)
 600 {
 601         attribute_table_desc.dir = dir;
 602         return osl(osl_create_table(&attribute_table_desc));
 603 }
 604
 605 /**
 606  * Initialize the attribute table structure.
 607  *
 608  * \param t The table structure to initialize.
 609  */
 610 void attribute_init(struct afs_table *t)
 611 {
 612         t->name = attribute_table_desc.name;
 613         t->open = attribute_open;
 614         t->close = attribute_close;
 615         t->create = attribute_create;
 616 }