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