attribute.c

   1 /*
   2  * Copyright (C) 1997-2014 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 "sideband.h"
  20 #include "command.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 = shm_get_shmmax(),
 155                         .private_data = &(struct afs_max_size_handler_data) {
 156                                 .fd = fd,
 157                                 .band = SBD_OUTPUT
 158                         },
 159                         .max_size_handler = afs_max_size_handler
 160                 }
 161
 162         };
 163         struct pattern_match_data pmd = {
 164                 .table = attribute_table,
 165                 .loop_col_num = ATTCOL_BITNUM,
 166                 .match_col_num = ATTCOL_NAME,
 167                 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
 168                         .size = query->size - sizeof(laad.flags)},
 169                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
 170                 .data = &laad,
 171                 .action = print_attribute
 172         };
 173         if (laad.flags & LSATT_FLAG_SORT_BY_ID)
 174                 pmd.loop_col_num = ATTCOL_NAME;
 175         if (laad.flags & LSATT_FLAG_REVERSE)
 176                 pmd.pm_flags |= PM_REVERSE_LOOP;
 177         for_each_matching_row(&pmd);
 178         if (laad.pb.offset)
 179                 pass_buffer_as_shm(fd, SBD_OUTPUT, laad.pb.buf, laad.pb.offset);
 180         free(laad.pb.buf);
 181 }
 182
 183 int com_lsatt(struct command_context *cc)
 184 {
 185         unsigned flags = 0;
 186         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 187         int ret, i;
 188
 189         for (i = 1; i < cc->argc; i++) {
 190                 const char *arg = cc->argv[i];
 191                 if (arg[0] != '-')
 192                         break;
 193                 if (!strcmp(arg, "--")) {
 194                         i++;
 195                         break;
 196                 }
 197                 if (!strcmp(arg, "-i")) {
 198                         flags |= LSATT_FLAG_SORT_BY_ID;
 199                         continue;
 200                 }
 201                 if (!strcmp(arg, "-l")) {
 202                         flags |= LSATT_FLAG_LONG;
 203                         continue;
 204                 }
 205                 if (!strcmp(arg, "-r")) {
 206                         flags |= LSATT_FLAG_REVERSE;
 207                         continue;
 208                 }
 209         }
 210         ret = send_option_arg_callback_request(&options, cc->argc - i, cc->argv + i,
 211                 com_lsatt_callback, afs_cb_result_handler, cc);
 212         if (ret < 0)
 213                 send_strerror(cc, -ret);
 214         else if (ret == 0 && cc->argc > 1)
 215                 ret = send_sb_va(&cc->scc, SBD_ERROR_LOG, "no matches\n");
 216         return ret;
 217 }
 218
 219 struct addatt_event_data {
 220         const char *name;
 221         unsigned char bitnum;
 222 };
 223
 224
 225 static void com_addatt_callback(int fd, const struct osl_object *query)
 226 {
 227         char *p;
 228         int ret = 1, ret2 = 0;
 229         struct para_buffer pb = {
 230                 .max_size = shm_get_shmmax(),
 231                 .private_data = &(struct afs_max_size_handler_data) {
 232                         .fd = fd,
 233                         .band = SBD_OUTPUT
 234                 },
 235                 .max_size_handler = afs_max_size_handler
 236         };
 237         size_t len;
 238
 239         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 240                 struct osl_object objs[NUM_ATT_COLUMNS];
 241                 struct osl_row *row;
 242                 unsigned char bitnum;
 243                 struct addatt_event_data aed;
 244
 245                 len = strlen(p);
 246                 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
 247                         ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
 248                         if (ret2 < 0)
 249                                 goto out;
 250                         continue;
 251                 }
 252                 ret = get_attribute_bitnum_by_name(p, &bitnum);
 253                 if (ret >= 0) {
 254                         ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
 255                         if (ret2 < 0)
 256                                 goto out;
 257                         continue;
 258                 }
 259                 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
 260                         goto out;
 261                 objs[ATTCOL_BITNUM].size = 1;
 262                 /* find smallest unused attribute */
 263                 for (bitnum = 0; bitnum < 64; bitnum++) {
 264                         objs[ATTCOL_BITNUM].data = &bitnum;
 265                         ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
 266                                 &objs[ATTCOL_BITNUM], &row));
 267                         if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 268                                 break; /* this bitnum is unused, use it */
 269                         if (ret < 0) /* error */
 270                                 goto out;
 271                         /* this bit is already in use, try next bit */
 272                 }
 273                 if (bitnum == 64) {
 274                         ret = -E_ATT_TABLE_FULL;
 275                         goto out;
 276                 }
 277                 objs[ATTCOL_NAME].data = p;
 278                 objs[ATTCOL_NAME].size = len + 1;
 279                 ret = osl(osl_add_row(attribute_table, objs));
 280                 if (ret < 0)
 281                         goto out;
 282                 aed.name = p;
 283                 aed.bitnum = bitnum;
 284                 afs_event(ATTRIBUTE_ADD, &pb, &aed);
 285                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
 286         }
 287 out:
 288         if (ret < 0 && ret2 >= 0)
 289                 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
 290         if (pb.offset)
 291                 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
 292         free(pb.buf);
 293 }
 294
 295 int com_addatt(struct command_context *cc)
 296 {
 297         int ret;
 298
 299         if (cc->argc < 2)
 300                 return -E_ATTR_SYNTAX;
 301         ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 302                 com_addatt_callback, afs_cb_result_handler, cc);
 303         if (ret < 0)
 304                 send_strerror(cc, -ret);
 305         return ret;
 306 }
 307
 308 static void com_mvatt_callback(int fd, const struct osl_object *query)
 309 {
 310         char *old = query->data;
 311         size_t size = strlen(old) + 1;
 312         char *new = old + size;
 313         struct osl_object obj = {.data = old, .size = size};
 314         struct osl_row *row;
 315         struct para_buffer pb = {
 316                 .max_size = shm_get_shmmax(),
 317                 .private_data = &(struct afs_max_size_handler_data) {
 318                         .fd = fd,
 319                         .band = SBD_OUTPUT
 320                 },
 321                 .max_size_handler = afs_max_size_handler,
 322         };
 323         int ret;
 324
 325         ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
 326         if (ret < 0)
 327                 goto out;
 328         obj.data = new;
 329         obj.size = strlen(new) + 1;
 330         ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
 331 out:
 332         if (ret < 0)
 333                 para_printf(&pb, "%s\n", para_strerror(-ret));
 334         else
 335                 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
 336         if (pb.offset)
 337                 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
 338         free(pb.buf);
 339 }
 340
 341 int com_mvatt(struct command_context *cc)
 342 {
 343         int ret;
 344
 345         if (cc->argc != 3)
 346                 return -E_ATTR_SYNTAX;
 347         ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 348                 com_mvatt_callback, afs_cb_result_handler, cc);
 349         if (ret < 0)
 350                 send_strerror(cc, -ret);
 351         return ret;
 352 }
 353
 354 /** Data passed to the action handler of com_rmatt(). */
 355 struct remove_attribute_action_data {
 356         /** Message buffer. */
 357         struct para_buffer pb;
 358         /** Numver of attributes removed. */
 359         int num_removed;
 360         /** Bitwise "or" of the removed attributes. */
 361         uint64_t mask_of_removed_atts;
 362 };
 363
 364 static int remove_attribute(struct osl_table *table, struct osl_row *row,
 365                 const char *name, void *data)
 366 {
 367         struct remove_attribute_action_data *raad = data;
 368         int ret;
 369         struct rmatt_event_data red = {.name = name};
 370
 371         ret = get_attribute_bitnum_by_name(name, &red.bitnum);
 372         if (ret < 0)
 373                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 374         ret = osl(osl_del_row(table, row));
 375         if (ret < 0)
 376                 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
 377         ret = para_printf(&raad->pb, "removed attribute %s\n", name);
 378         raad->num_removed++;
 379         raad->mask_of_removed_atts |= (1 << red.bitnum);
 380         afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
 381         return ret;
 382 }
 383
 384 static void com_rmatt_callback(int fd, const struct osl_object *query)
 385 {
 386         struct remove_attribute_action_data raad = {
 387                 .num_removed = 0,
 388                 .pb = {
 389                         .max_size = shm_get_shmmax(),
 390                         .private_data = &(struct afs_max_size_handler_data) {
 391                                 .fd = fd,
 392                                 .band = SBD_OUTPUT
 393                         },
 394                         .max_size_handler = afs_max_size_handler,
 395                 }
 396         };
 397         int ret, ret2 = 0;
 398         struct pattern_match_data pmd = {
 399                 .table = attribute_table,
 400                 .patterns = *query,
 401                 .loop_col_num = ATTCOL_BITNUM,
 402                 .match_col_num = ATTCOL_NAME,
 403                 .data = &raad,
 404                 .action = remove_attribute
 405         };
 406         ret = for_each_matching_row(&pmd);
 407         if (ret < 0)
 408                 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
 409         else if (!raad.num_removed)
 410                 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
 411         if (ret2 >= 0 && raad.pb.offset)
 412                 pass_buffer_as_shm(fd, SBD_OUTPUT, raad.pb.buf, raad.pb.offset);
 413         free(raad.pb.buf);
 414 }
 415
 416 int com_rmatt(struct command_context *cc)
 417 {
 418         int ret;
 419
 420         if (cc->argc < 2)
 421                 return -E_ATTR_SYNTAX;
 422         ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
 423                 com_rmatt_callback, afs_cb_result_handler, cc);
 424         if (ret < 0)
 425                 send_strerror(cc, -ret);
 426         return ret;
 427 }
 428
 429 /**
 430  * Return a binary representation of the given attribute value.
 431  *
 432  * \param atts Pointer to the attribute value.
 433  * \param buf Result.
 434  *
 435  * This function prints a string of at most 64 characters plus the terminating
 436  * \p NULL character into \a buf which must be provided by the caller and at
 437  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 438  * used for unset attributes.
 439  *
 440  * In practice, not all 64 attributes are defined. In this case, the function
 441  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 442  * attribute.
 443  */
 444 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 445 {
 446         int i;
 447         const uint64_t one = 1;
 448
 449         for (i = 0; i <= greatest_att_bitnum; i++)
 450                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 451         buf[i] = '\0';
 452 }
 453
 454 /**
 455  * Get a string containing the set attributes in text form.
 456  *
 457  * \param atts The attribute bitmap.
 458  * \param delim The delimiter to separate matching attribute names.
 459  * \param text Result pointer.
 460  *
 461  * \return Positive on success, negative on errors. If no attributes have
 462  * been defined, \a *text is NULL.
 463  */
 464 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 465 {
 466         int i, ret;
 467         const uint64_t one = 1;
 468
 469         *text = NULL;
 470         if (greatest_att_bitnum < 0) { /* no attributes available */
 471                 *text = para_strdup("(no attributes available)");
 472                 return 1;
 473         }
 474         for (i = 0; i <= greatest_att_bitnum; i++) {
 475                 unsigned char bn = i;
 476                 struct osl_object obj = {.data = &bn, .size = 1};
 477                 struct osl_row *row;
 478
 479                 if (!(*atts & (one << i)))
 480                         continue;
 481                 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
 482                 if (ret < 0)
 483                         goto err;
 484                 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
 485                 if (ret < 0)
 486                         goto err;
 487                 if (*text) {
 488                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 489                         free(*text);
 490                         *text = tmp;
 491                 } else
 492                         *text = para_strdup(obj.data);
 493         }
 494         if (!*text) /* no attributes set */
 495                 *text = para_strdup("");
 496         return 1;
 497 err:
 498         free(*text);
 499         return ret;
 500 }
 501
 502 /**
 503  * Close the attribute table.
 504  *
 505  * \sa osl_close_table().
 506  */
 507 static void attribute_close(void)
 508 {
 509         osl_close_table(attribute_table, OSL_MARK_CLEAN);
 510         attribute_table = NULL;
 511 }
 512
 513 /**
 514  * Open the attribute table.
 515  *
 516  * \param dir The database directory.
 517  *
 518  * \return Positive on success, negative on errors.
 519  *
 520  * \sa osl_open_table().
 521  */
 522 static int attribute_open(const char *dir)
 523 {
 524         int ret;
 525
 526         attribute_table_desc.dir = dir;
 527         ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
 528         greatest_att_bitnum = -1; /* no atts available */
 529         if (ret >= 0) {
 530                 find_greatest_att_bitnum();
 531                 return ret;
 532         }
 533         attribute_table = NULL;
 534         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 535                 return 1;
 536         return ret;
 537 }
 538
 539 static int attribute_create(const char *dir)
 540 {
 541         attribute_table_desc.dir = dir;
 542         return osl(osl_create_table(&attribute_table_desc));
 543 }
 544
 545 /**
 546  * Initialize the attribute table structure.
 547  *
 548  * \param t The table structure to initialize.
 549  */
 550 void attribute_init(struct afs_table *t)
 551 {
 552         t->open = attribute_open;
 553         t->close = attribute_close;
 554         t->create = attribute_create;
 555 }