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 <regex.h>
  10 #include <openssl/rc4.h>
  11 #include <osl.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "crypt.h"
  16 #include "string.h"
  17 #include "afh.h"
  18 #include "afs.h"
  19 #include "net.h"
  20 #include "ipc.h"
  21
  22 static struct osl_table *attribute_table;
  23 static int greatest_att_bitnum;
  24
  25 /** The columns of the attribute table. */
  26 enum attribute_table_columns {
  27         /** The bit number (0-63). */
  28         ATTCOL_BITNUM,
  29         /** The name of the attribute. */
  30         ATTCOL_NAME,
  31         /** Number of columns in this table. */
  32         NUM_ATT_COLUMNS
  33 };
  34
  35 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  36 {
  37         const unsigned char *c1 = (const unsigned char*)obj1->data;
  38         const unsigned char *c2 = (const unsigned char*)obj2->data;
  39         if (*c1 > *c2)
  40                 return 1;
  41         if (*c1 < *c2)
  42                 return -1;
  43         return 0;
  44 }
  45
  46 static struct osl_column_description att_cols[] = {
  47         [ATTCOL_BITNUM] = {
  48                 .storage_type = OSL_MAPPED_STORAGE,
  49                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
  50                 .name = "bitnum",
  51                 .compare_function = char_compare,
  52                 .data_size = 1
  53         },
  54         [ATTCOL_NAME] = {
  55                 .storage_type = OSL_MAPPED_STORAGE,
  56                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  57                 .name = "name",
  58                 .compare_function = string_compare,
  59         }
  60 };
  61
  62 static struct osl_table_description attribute_table_desc = {
  63         .name = "attributes",
  64         .num_columns = NUM_ATT_COLUMNS,
  65         .flags = 0,
  66         .column_descriptions = att_cols
  67 };
  68
  69 static void find_greatest_att_bitnum(void)
  70 {
  71         unsigned char c = 63;
  72         do {
  73                 struct osl_row *row;
  74                 struct osl_object obj = {.data = &c, .size = 1};
  75                 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
  76                                 &row) >= 0) {
  77                         greatest_att_bitnum = c;
  78                         return;
  79                 }
  80         } while (c--);
  81         PARA_INFO_LOG("no attributes\n");
  82         greatest_att_bitnum = -E_NO_ATTRIBUTES;
  83 }
  84
  85 /**
  86  * Retrieve the identifier (number) of an attribute.
  87  *
  88  * \param att_name The name of the attribute.
  89  * \param bitnum Result pointer.
  90  *
  91  * \return Positive on success, negative on errors.
  92  */
  93 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
  94 {
  95         struct osl_object obj = {.data = (char *)att_name,
  96                 .size = strlen(att_name) + 1};
  97         struct osl_row *row;
  98         int ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
  99
 100         if (ret < 0)
 101                 return ret;
 102         ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj));
 103         if (ret < 0)
 104                 return ret;
 105         *bitnum = *(unsigned char *)obj.data;
 106         return 1;
 107 }
 108
 109 /**
 110  * Flags used by the lsatt command.
 111  *
 112  * \param \sa com_lsatt().
 113  */
 114 enum lsatt_flags {
 115         /** Whether "-a" was given for the lsatt command. */
 116         LSATT_FLAG_SORT_BY_ID = 1,
 117         /** Whether "-l" was given for the lsatt command. */
 118         LSATT_FLAG_LONG = 2,
 119         /** Reverse sort order. */
 120         LSATT_FLAG_REVERSE = 4
 121 };
 122
 123 /** Data passed to the action function of lsatt */
 124 struct lsatt_action_data {
 125         /** The result buffer. */
 126         struct para_buffer pb;
 127         /** The given flags for the lsatt command. */
 128         unsigned flags;
 129 };
 130
 131 static int print_attribute(struct osl_table *table, struct osl_row *row,
 132                 const char *name, void *data)
 133 {
 134         struct lsatt_action_data *laad = data;
 135         struct osl_object bitnum_obj;
 136         int ret;
 137
 138         if (!(laad->flags & LSATT_FLAG_LONG))
 139                 return para_printf(&laad->pb, "%s\n", name);
 140         ret = osl(osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj));
 141         if (ret < 0) {
 142                 para_printf(&laad->pb, "%s: %s\n", name, para_strerror(-ret));
 143                 return ret;
 144         }
 145         return para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
 146                 name);
 147 }
 148
 149 static void com_lsatt_callback(int fd, const struct osl_object *query)
 150 {
 151         struct lsatt_action_data laad = {
 152                 .flags = *(unsigned *) query->data,
 153                 .pb = {
 154                         .max_size = SHMMAX,
 155                         .private_data = &fd,
 156                         .max_size_handler = pass_buffer_as_shm
 157                 }
 158
 159         };
 160         struct pattern_match_data pmd = {
 161                 .table = attribute_table,
 162                 .loop_col_num = ATTCOL_BITNUM,
 163                 .match_col_num = ATTCOL_NAME,
 164                 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
 165                         .size = query->size - sizeof(laad.flags)},
 166                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
 167                 .data = &laad,
 168                 .action = print_attribute
 169         };
 170         if (laad.flags & LSATT_FLAG_SORT_BY_ID)
 171                 pmd.loop_col_num = ATTCOL_NAME;
 172         if (laad.flags & LSATT_FLAG_REVERSE)
 173                 pmd.pm_flags |= PM_REVERSE_LOOP;
 174         for_each_matching_row(&pmd);
 175         if (laad.pb.offset)
 176                 pass_buffer_as_shm(laad.pb.buf, laad.pb.offset, &fd);
 177         free(laad.pb.buf);
 178 }
 179
 180 int com_lsatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 181 {
 182         unsigned flags = 0;
 183         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 184         int ret, i;
 185
 186         for (i = 1; i < argc; i++) {
 187                 const char *arg = argv[i];
 188                 if (arg[0] != '-')
 189                         break;
 190                 if (!strcmp(arg, "--")) {
 191                         i++;
 192                         break;
 193                 }
 194                 if (!strcmp(arg, "-i")) {
 195                         flags |= LSATT_FLAG_SORT_BY_ID;
 196                         continue;
 197                 }
 198                 if (!strcmp(arg, "-l")) {
 199                         flags |= LSATT_FLAG_LONG;
 200                         continue;
 201                 }
 202                 if (!strcmp(arg, "-r")) {
 203                         flags |= LSATT_FLAG_REVERSE;
 204                         continue;
 205                 }
 206         }
 207         ret = send_option_arg_callback_request(&options, argc - i, argv + i,
 208                 com_lsatt_callback, rc4_send_result, rc4c);
 209         if (!ret) {
 210                 if (argc > 1)
 211                         ret = rc4_send_va_buffer(rc4c, "no matches\n");
 212         } else if (ret < 0)
 213                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 214         return ret;
 215 }
 216
 217 static void com_setatt_callback(__a_unused int fd, const struct osl_object *query)
 218 {
 219         char *p;
 220         uint64_t add_mask = 0, del_mask = 0;
 221         int ret;
 222         size_t len;
 223         struct osl_object obj;
 224         struct osl_row *row;
 225
 226         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 227                 char c;
 228
 229                 len = strlen(p);
 230                 ret = -E_ATTR_SYNTAX;
 231                 if (!*p)
 232                         goto out;
 233                 c = p[len - 1];
 234                 if (c != '+' && c != '-')
 235                         break;
 236                 p[len - 1] = '\0';
 237                 obj.data = p;
 238                 obj.size = len + 1;
 239                 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 240                 if (ret < 0)
 241                         goto out;
 242                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 243                         &obj));
 244                 if (ret < 0)
 245                         goto out;
 246                 if (c == '+')
 247                         add_mask |= (1UL << *(unsigned char *)obj.data);
 248                 else
 249                         del_mask |= (1UL << *(unsigned char *)obj.data);
 250         }
 251         ret = -E_ATTR_SYNTAX;
 252         if (!add_mask && !del_mask)
 253                 goto out;
 254         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 255                 (long long unsigned)del_mask);
 256         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 257                 struct afs_info old_afsi, new_afsi;
 258                 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
 259
 260                 len = strlen(p);
 261                 ret = aft_get_row_of_path(p, &aced.aft_row);
 262                 if (ret < 0)
 263                         goto out;
 264                 ret = get_afsi_object_of_row(aced.aft_row, &obj);
 265                 if (ret < 0)
 266                         goto out;
 267                 ret = load_afsi(&old_afsi, &obj);
 268                 if (ret < 0)
 269                         goto out;
 270                 new_afsi = old_afsi;
 271                 new_afsi.attributes |= add_mask;
 272                 new_afsi.attributes &= ~del_mask;
 273                 save_afsi(&new_afsi, &obj); /* in-place update */
 274                 afs_event(AFSI_CHANGE, NULL, &aced);
 275         }
 276 out:
 277         if (ret < 0)
 278                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 279 }
 280
 281 int com_setatt(__a_unused struct rc4_context *rc4c, int argc, char * const * const argv)
 282 {
 283         if (argc < 3)
 284                 return -E_ATTR_SYNTAX;
 285         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 286                 NULL, NULL);
 287 }
 288
 289 struct addatt_event_data {
 290         const char *name;
 291         unsigned char bitnum;
 292 };
 293
 294
 295 static void com_addatt_callback(int fd, const struct osl_object *query)
 296 {
 297         char *p;
 298         int ret = 1, ret2 = 0;
 299         struct para_buffer pb = {
 300                 .max_size = SHMMAX,
 301                 .private_data = &fd,
 302                 .max_size_handler = pass_buffer_as_shm
 303         };
 304         size_t len;
 305
 306         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 307                 struct osl_object objs[NUM_ATT_COLUMNS];
 308                 struct osl_row *row;
 309                 unsigned char bitnum;
 310                 struct addatt_event_data aed;
 311
 312                 len = strlen(p);
 313                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 314                         ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
 315                         if (ret2 < 0)
 316                                 goto out;
 317                         continue;
 318                 }
 319                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 320                 if (ret >= 0) {
 321                         ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
 322                         if (ret2 < 0)
 323                                 goto out;
 324                         continue;
 325                 }
 326                 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
 327                         goto out;
 328                 objs[ATTCOL_BITNUM].size = 1;
 329                 /* find smallest unused attribute */
 330                 for (bitnum = 0; bitnum < 64; bitnum++) {
 331                         objs[ATTCOL_BITNUM].data = &bitnum;
 332                         ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
 333                                 &objs[ATTCOL_BITNUM], &row));
 334                         if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 335                                 break; /* this bitnum is unused, use it */
 336                         if (ret < 0) /* error */
 337                                 goto out;
 338                         /* this bit is already in use, try next bit */
 339                 }
 340                 if (bitnum == 64) {
 341                         ret = -E_ATT_TABLE_FULL;
 342                         goto out;
 343                 }
 344                 objs[ATTCOL_NAME].data = p;
 345                 objs[ATTCOL_NAME].size = len + 1;
 346                 ret = osl(osl_add_row(attribute_table, objs));
 347                 if (ret < 0)
 348                         goto out;
 349                 aed.name = p;
 350                 aed.bitnum = bitnum;
 351                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 352                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
 353         }
 354 out:
 355         if (ret < 0 && ret2 >= 0)
 356                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 357         if (pb.offset)
 358                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 359         free(pb.buf);
 360 }
 361
 362 int com_addatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 363 {
 364         int ret;
 365
 366         if (argc < 2)
 367                 return -E_ATTR_SYNTAX;
 368         ret = send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 369                 rc4_send_result, rc4c);
 370         if (ret < 0)
 371                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 372         return ret;
 373 }
 374
 375 static void com_mvatt_callback(int fd, const struct osl_object *query)
 376 {
 377         char *old = query->data;
 378         size_t size = strlen(old) + 1;
 379         char *new = old + size;
 380         struct osl_object obj = {.data = old, .size = size};
 381         struct osl_row *row;
 382         struct para_buffer pb = {
 383                 .max_size = SHMMAX,
 384                 .private_data = &fd,
 385                 .max_size_handler = pass_buffer_as_shm
 386         };
 387         int ret;
 388
 389         ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 390         if (ret < 0)
 391                 goto out;
 392         obj.data = new;
 393         obj.size = strlen(new) + 1;
 394         ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
 395 out:
 396         if (ret < 0)
 397                 para_printf(&pb, "%s\n", para_strerror(-ret));
 398         else
 399                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 400         if (pb.offset)
 401                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 402         free(pb.buf);
 403 }
 404
 405 int com_mvatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 406 {
 407         int ret;
 408
 409         if (argc != 3)
 410                 return -E_ATTR_SYNTAX;
 411         ret = send_standard_callback_request(argc - 1, argv + 1, com_mvatt_callback,
 412                 rc4_send_result, rc4c);
 413         if (ret < 0)
 414                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 415         return ret;
 416 }
 417
 418 /** Data passed to the action handler of com_rmatt(). */
 419 struct remove_attribute_action_data {
 420         /** Message buffer. */
 421         struct para_buffer pb;
 422         /** Numver of attributes removed. */
 423         int num_removed;
 424         /** Bitwise "or" of the removed attributes. */
 425         uint64_t mask_of_removed_atts;
 426 };
 427
 428 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 429                 const char *name, void *data)
 430 {
 431         struct remove_attribute_action_data *raad = data;
 432         int ret;
 433         struct rmatt_event_data red = {.name = name};
 434
 435         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 436         if (ret < 0)
 437                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 438         ret = osl(osl_del_row(table, row));
 439         if (ret < 0)
 440                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 441         ret = para_printf(&raad->pb, "removed attribute %s\n", name);
 442         raad->num_removed++;
 443         raad->mask_of_removed_atts |= (1 << red.bitnum);
 444         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 445         return ret;
 446 }
 447
 448 static void com_rmatt_callback(int fd, const struct osl_object *query)
 449 {
 450         struct remove_attribute_action_data raad = {
 451                 .num_removed = 0,
 452                 .pb = {
 453                         .max_size = SHMMAX,
 454                         .private_data = &fd,
 455                         .max_size_handler = pass_buffer_as_shm
 456                 }
 457         };
 458         int ret, ret2 = 0;
 459         struct pattern_match_data pmd = {
 460                 .table = attribute_table,
 461                 .patterns = *query,
 462                 .loop_col_num = ATTCOL_BITNUM,
 463                 .match_col_num = ATTCOL_NAME,
 464                 .data = &raad,
 465                 .action = remove_attribute
 466         };
 467         ret = for_each_matching_row(&pmd);
 468         if (ret < 0)
 469                 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 470         else if (!raad.num_removed)
 471                 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
 472         if (ret2 >= 0 && raad.pb.offset)
 473                 pass_buffer_as_shm(raad.pb.buf, raad.pb.offset, &fd);
 474         free(raad.pb.buf);
 475 }
 476
 477 int com_rmatt(struct rc4_context *rc4c, int argc, char * const * const argv)
 478 {
 479         int ret;
 480
 481         if (argc < 2)
 482                 return -E_ATTR_SYNTAX;
 483         ret = send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 484                 rc4_send_result, rc4c);
 485         if (ret < 0)
 486                 rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
 487         return ret;
 488 }
 489
 490 /**
 491  * Return a binary representation of the given attribute value.
 492  *
 493  * \param atts Pointer to the attribute value.
 494  * \param buf Result.
 495  *
 496  * This function prints a string of at most 64 characters plus the terminating
 497  * \p NULL character into \a buf which must be provided by the caller and at
 498  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 499  * used for unset attributes.
 500  *
 501  * In practice, not all 64 attributes are defined. In this case, the function
 502  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 503  * attribute.
 504  */
 505 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 506 {
 507         int i;
 508         const uint64_t one = 1;
 509
 510         for (i = 0; i <= greatest_att_bitnum; i++)
 511                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 512         buf[i] = '\0';
 513 }
 514
 515 /**
 516  * Get a string containing the set attributes in text form.
 517  *
 518  * \param atts The attribute bitmap.
 519  * \param delim The delimiter to separate matching attribute names.
 520  * \param text Result pointer.
 521  *
 522  * \return Positive on success, negative on errors. If no attributes have
 523  * been defined, \a *text is NULL.
 524  */
 525 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 526 {
 527         int i, ret;
 528         const uint64_t one = 1;
 529
 530         *text = NULL;
 531         if (greatest_att_bitnum < 0) { /* no attributes available */
 532                 *text = para_strdup("(no attributes available)");
 533                 return 1;
 534         }
 535         for (i = 0; i <= greatest_att_bitnum; i++) {
 536                 unsigned char bn = i;
 537                 struct osl_object obj = {.data = &bn, .size = 1};
 538                 struct osl_row *row;
 539
 540                 if (!(*atts & (one << i)))
 541                         continue;
 542                 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
 543                 if (ret < 0)
 544                         goto err;
 545                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
 546                 if (ret < 0)
 547                         goto err;
 548                 if (*text) {
 549                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 550                         free(*text);
 551                         *text = tmp;
 552                 } else
 553                         *text = para_strdup(obj.data);
 554         }
 555         if (!*text) /* no attributes set */
 556                 *text = para_strdup("");
 557         return 1;
 558 err:
 559         free(*text);
 560         return ret;
 561 }
 562
 563 /**
 564  * Close the attribute table.
 565  *
 566  * \sa osl_close_table().
 567  */
 568 static void attribute_close(void)
 569 {
 570         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 571         attribute_table = NULL;
 572 }
 573
 574 /**
 575  * Open the attribute table.
 576  *
 577  * \param dir The database directory.
 578  *
 579  * \return Positive on success, negative on errors.
 580  *
 581  * \sa osl_open_table().
 582  */
 583 static int attribute_open(const char *dir)
 584 {
 585         int ret;
 586
 587         attribute_table_desc.dir = dir;
 588         ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
 589         greatest_att_bitnum = -1; /* no atts available */
 590         if (ret >= 0) {
 591                 find_greatest_att_bitnum();
 592                 return ret;
 593         }
 594         attribute_table = NULL;
 595         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 596                 return 1;
 597         return ret;
 598 }
 599
 600 static int attribute_create(const char *dir)
 601 {
 602         attribute_table_desc.dir = dir;
 603         return osl(osl_create_table(&attribute_table_desc));
 604 }
 605
 606 /**
 607  * Initialize the attribute table structure.
 608  *
 609  * \param t The table structure to initialize.
 610  */
 611 void attribute_init(struct afs_table *t)
 612 {
 613         t->open = attribute_open;
 614         t->close = attribute_close;
 615         t->create = attribute_create;
 616 }