[07a3253d] | 1 | /* |
---|
| 2 | * Evaluation IMFS Node Support Routines |
---|
| 3 | * |
---|
[08311cc3] | 4 | * COPYRIGHT (c) 1989-1999. |
---|
[07a3253d] | 5 | * On-Line Applications Research Corporation (OAR). |
---|
| 6 | * |
---|
| 7 | * The license and distribution terms for this file may be |
---|
| 8 | * found in the file LICENSE in this distribution or at |
---|
| 9 | * http://www.OARcorp.com/rtems/license.html. |
---|
| 10 | * |
---|
| 11 | * $Id$ |
---|
| 12 | */ |
---|
| 13 | |
---|
[d6b1d73] | 14 | #if HAVE_CONFIG_H |
---|
| 15 | #include "config.h" |
---|
| 16 | #endif |
---|
| 17 | |
---|
[07a3253d] | 18 | #include <sys/types.h> |
---|
| 19 | #include <sys/stat.h> |
---|
| 20 | #include <fcntl.h> |
---|
| 21 | #include <unistd.h> |
---|
| 22 | #include <errno.h> |
---|
| 23 | #include <stdlib.h> |
---|
| 24 | #include <assert.h> |
---|
| 25 | |
---|
| 26 | #include "imfs.h" |
---|
[c058578] | 27 | #include <rtems/libio_.h> |
---|
[07a3253d] | 28 | |
---|
| 29 | #define RTEMS_LIBIO_PERMS_RX (RTEMS_LIBIO_PERMS_SEARCH | RTEMS_LIBIO_PERMS_READ) |
---|
| 30 | #define RTEMS_LIBIO_PERMS_WX (RTEMS_LIBIO_PERMS_SEARCH | RTEMS_LIBIO_PERMS_WRITE) |
---|
| 31 | |
---|
| 32 | #define MAXSYMLINK 5 |
---|
| 33 | |
---|
[b6a2d2fa] | 34 | int IMFS_Set_handlers( |
---|
[07a3253d] | 35 | rtems_filesystem_location_info_t *loc |
---|
| 36 | ) |
---|
| 37 | { |
---|
[657e1bf6] | 38 | IMFS_jnode_t *node = loc->node_access; |
---|
| 39 | IMFS_fs_info_t *fs_info; |
---|
[07a3253d] | 40 | |
---|
[657e1bf6] | 41 | fs_info = loc->mt_entry->fs_info; |
---|
[07a3253d] | 42 | switch( node->type ) { |
---|
| 43 | case IMFS_DIRECTORY: |
---|
[657e1bf6] | 44 | loc->handlers = fs_info->directory_handlers; |
---|
[07a3253d] | 45 | break; |
---|
| 46 | case IMFS_DEVICE: |
---|
[51435fc7] | 47 | loc->handlers = &IMFS_device_handlers; |
---|
[07a3253d] | 48 | break; |
---|
| 49 | case IMFS_SYM_LINK: |
---|
| 50 | case IMFS_HARD_LINK: |
---|
[94b357c2] | 51 | loc->handlers = &IMFS_link_handlers; |
---|
[07a3253d] | 52 | break; |
---|
[0ef748fb] | 53 | case IMFS_LINEAR_FILE: |
---|
| 54 | loc->handlers = fs_info->linearfile_handlers; |
---|
| 55 | break; |
---|
[07a3253d] | 56 | case IMFS_MEMORY_FILE: |
---|
[657e1bf6] | 57 | loc->handlers = fs_info->memfile_handlers; |
---|
[07a3253d] | 58 | break; |
---|
| 59 | } |
---|
| 60 | |
---|
| 61 | return 0; |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | /* |
---|
| 65 | * IMFS_evaluate_permission |
---|
| 66 | * |
---|
| 67 | * The following routine evaluates that we have permission |
---|
| 68 | * to do flags on the node. |
---|
| 69 | */ |
---|
| 70 | |
---|
| 71 | int IMFS_evaluate_permission( |
---|
| 72 | rtems_filesystem_location_info_t *node, |
---|
| 73 | int flags |
---|
| 74 | ) |
---|
| 75 | { |
---|
| 76 | uid_t st_uid; |
---|
| 77 | gid_t st_gid; |
---|
| 78 | IMFS_jnode_t *jnode; |
---|
| 79 | int flags_to_test; |
---|
| 80 | |
---|
[2f87c843] | 81 | if ( !rtems_libio_is_valid_perms( flags ) ) { |
---|
[07a3253d] | 82 | assert( 0 ); |
---|
| 83 | set_errno_and_return_minus_one( EIO ); |
---|
| 84 | } |
---|
| 85 | |
---|
| 86 | jnode = node->node_access; |
---|
| 87 | |
---|
| 88 | #if defined(RTEMS_POSIX_API) |
---|
| 89 | st_uid = geteuid(); |
---|
| 90 | st_gid = getegid(); |
---|
| 91 | #else |
---|
| 92 | st_uid = jnode->st_uid; |
---|
| 93 | st_gid = jnode->st_gid; |
---|
| 94 | #endif |
---|
| 95 | |
---|
| 96 | /* |
---|
| 97 | * Check if I am owner or a group member or someone else. |
---|
| 98 | */ |
---|
| 99 | |
---|
| 100 | flags_to_test = flags; |
---|
| 101 | |
---|
| 102 | if ( st_uid == jnode->st_uid ) |
---|
| 103 | flags_to_test <<= 6; |
---|
| 104 | else if ( st_gid == jnode->st_gid ) |
---|
| 105 | flags_to_test <<= 3; |
---|
| 106 | else |
---|
| 107 | /* must be other - do nothing */; |
---|
| 108 | |
---|
| 109 | /* |
---|
| 110 | * If all of the flags are set we have permission |
---|
| 111 | * to do this. |
---|
| 112 | */ |
---|
| 113 | if ( ( flags_to_test & jnode->st_mode) == flags_to_test ) |
---|
| 114 | return 1; |
---|
| 115 | |
---|
| 116 | return 0; |
---|
| 117 | } |
---|
| 118 | |
---|
| 119 | /* |
---|
| 120 | * IMFS_evaluate_hard_link |
---|
| 121 | * |
---|
| 122 | * The following routine evaluates a hardlink to the actual node. |
---|
| 123 | */ |
---|
| 124 | |
---|
| 125 | int IMFS_evaluate_hard_link( |
---|
| 126 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
---|
| 127 | int flags /* IN */ |
---|
| 128 | ) |
---|
| 129 | { |
---|
| 130 | IMFS_jnode_t *jnode = node->node_access; |
---|
| 131 | int result = 0; |
---|
| 132 | |
---|
| 133 | /* |
---|
| 134 | * Check for things that should never happen. |
---|
| 135 | */ |
---|
| 136 | |
---|
| 137 | if ( jnode->type != IMFS_HARD_LINK ) |
---|
| 138 | rtems_fatal_error_occurred (0xABCD0000); |
---|
| 139 | |
---|
| 140 | /* |
---|
| 141 | * Set the hard link value and the handlers. |
---|
| 142 | */ |
---|
| 143 | |
---|
| 144 | node->node_access = jnode->info.hard_link.link_node; |
---|
| 145 | |
---|
| 146 | IMFS_Set_handlers( node ); |
---|
| 147 | |
---|
| 148 | /* |
---|
| 149 | * Verify we have the correct permissions for this node. |
---|
| 150 | */ |
---|
| 151 | |
---|
[2f87c843] | 152 | if ( !IMFS_evaluate_permission( node, flags ) ) |
---|
[07a3253d] | 153 | set_errno_and_return_minus_one( EACCES ); |
---|
| 154 | |
---|
| 155 | return result; |
---|
| 156 | } |
---|
| 157 | |
---|
| 158 | |
---|
| 159 | /* |
---|
| 160 | * IMFS_evaluate_sym_link |
---|
| 161 | * |
---|
| 162 | * The following routine evaluates a symbolic link to the actual node. |
---|
| 163 | */ |
---|
| 164 | |
---|
| 165 | int IMFS_evaluate_sym_link( |
---|
| 166 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
---|
| 167 | int flags /* IN */ |
---|
| 168 | ) |
---|
| 169 | { |
---|
| 170 | IMFS_jnode_t *jnode = node->node_access; |
---|
| 171 | int result = 0; |
---|
| 172 | int i; |
---|
| 173 | |
---|
| 174 | /* |
---|
| 175 | * Check for things that should never happen. |
---|
| 176 | */ |
---|
| 177 | |
---|
| 178 | if ( jnode->type != IMFS_SYM_LINK ) |
---|
| 179 | rtems_fatal_error_occurred (0xABCD0000); |
---|
| 180 | |
---|
| 181 | if ( !jnode->Parent ) |
---|
| 182 | rtems_fatal_error_occurred( 0xBAD00000 ); |
---|
| 183 | |
---|
| 184 | |
---|
| 185 | /* |
---|
| 186 | * Move the node_access to either the symbolic links parent or |
---|
| 187 | * root depending on the symbolic links path. |
---|
| 188 | */ |
---|
| 189 | |
---|
| 190 | node->node_access = jnode->Parent; |
---|
| 191 | |
---|
| 192 | rtems_filesystem_get_sym_start_loc( |
---|
| 193 | jnode->info.sym_link.name, |
---|
| 194 | &i, |
---|
| 195 | node |
---|
| 196 | ); |
---|
| 197 | |
---|
| 198 | /* |
---|
| 199 | * Use eval path to evaluate the path of the symbolic link. |
---|
| 200 | */ |
---|
| 201 | |
---|
| 202 | result = IMFS_eval_path( |
---|
| 203 | &jnode->info.sym_link.name[i], |
---|
| 204 | flags, |
---|
| 205 | node |
---|
| 206 | ); |
---|
| 207 | |
---|
| 208 | IMFS_Set_handlers( node ); |
---|
| 209 | |
---|
| 210 | /* |
---|
| 211 | * Verify we have the correct permissions for this node. |
---|
| 212 | */ |
---|
| 213 | |
---|
[2f87c843] | 214 | if ( !IMFS_evaluate_permission( node, flags ) ) |
---|
[07a3253d] | 215 | set_errno_and_return_minus_one( EACCES ); |
---|
| 216 | |
---|
| 217 | return result; |
---|
| 218 | } |
---|
| 219 | |
---|
| 220 | /* |
---|
| 221 | * IMFS_evaluate_link |
---|
| 222 | * |
---|
| 223 | * The following routine returns the real node pointed to by a link. |
---|
| 224 | */ |
---|
| 225 | |
---|
| 226 | int IMFS_evaluate_link( |
---|
| 227 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
---|
| 228 | int flags /* IN */ |
---|
| 229 | ) |
---|
| 230 | { |
---|
| 231 | IMFS_jnode_t *jnode; |
---|
| 232 | int result = 0; |
---|
| 233 | |
---|
| 234 | do { |
---|
| 235 | jnode = node->node_access; |
---|
| 236 | |
---|
| 237 | /* |
---|
| 238 | * Increment and check the link counter. |
---|
| 239 | */ |
---|
| 240 | |
---|
| 241 | rtems_filesystem_link_counts ++; |
---|
| 242 | if ( rtems_filesystem_link_counts > MAXSYMLINK ) { |
---|
| 243 | rtems_filesystem_link_counts = 0; |
---|
| 244 | set_errno_and_return_minus_one( ELOOP ); |
---|
| 245 | } |
---|
| 246 | |
---|
| 247 | /* |
---|
| 248 | * Follow the Link node. |
---|
| 249 | */ |
---|
| 250 | |
---|
| 251 | if ( jnode->type == IMFS_HARD_LINK ) |
---|
| 252 | result = IMFS_evaluate_hard_link( node, flags ); |
---|
| 253 | |
---|
| 254 | else if (jnode->type == IMFS_SYM_LINK ) |
---|
| 255 | result = IMFS_evaluate_sym_link( node, flags ); |
---|
| 256 | |
---|
| 257 | } while ( ( result == 0 ) && ( ( jnode->type == IMFS_SYM_LINK ) || |
---|
| 258 | ( jnode->type == IMFS_HARD_LINK ) ) ); |
---|
| 259 | |
---|
| 260 | /* |
---|
| 261 | * Clear link counter. |
---|
| 262 | */ |
---|
| 263 | |
---|
| 264 | rtems_filesystem_link_counts = 0; |
---|
| 265 | |
---|
| 266 | return result; |
---|
| 267 | } |
---|
| 268 | |
---|
| 269 | |
---|
| 270 | /* |
---|
| 271 | * IMFS_evaluate_for_make |
---|
| 272 | * |
---|
| 273 | * The following routine evaluate path for a new node to be created. |
---|
| 274 | * pathloc is returned with a pointer to the parent of the new node. |
---|
| 275 | * name is returned with a pointer to the first character in the |
---|
| 276 | * new node name. The parent node is verified to be a directory. |
---|
| 277 | */ |
---|
| 278 | |
---|
| 279 | int IMFS_evaluate_for_make( |
---|
| 280 | const char *path, /* IN */ |
---|
| 281 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
---|
| 282 | const char **name /* OUT */ |
---|
| 283 | ) |
---|
| 284 | { |
---|
| 285 | int i = 0; |
---|
| 286 | int len; |
---|
| 287 | IMFS_token_types type; |
---|
[3cf8394] | 288 | char token[ IMFS_NAME_MAX + 1 ]; |
---|
[07a3253d] | 289 | rtems_filesystem_location_info_t newloc; |
---|
| 290 | IMFS_jnode_t *node; |
---|
| 291 | int done = 0; |
---|
| 292 | int result; |
---|
| 293 | |
---|
| 294 | /* |
---|
[b6a2d2fa] | 295 | * This was filled in by the caller and is valid in the |
---|
[07a3253d] | 296 | * mount table. |
---|
| 297 | */ |
---|
| 298 | node = pathloc->node_access; |
---|
| 299 | |
---|
| 300 | /* |
---|
| 301 | * Evaluate all tokens until we are done or an error occurs. |
---|
| 302 | */ |
---|
| 303 | |
---|
| 304 | while( !done ) { |
---|
| 305 | |
---|
| 306 | type = IMFS_get_token( &path[i], token, &len ); |
---|
| 307 | i += len; |
---|
| 308 | |
---|
| 309 | if ( !pathloc->node_access ) |
---|
| 310 | set_errno_and_return_minus_one( ENOENT ); |
---|
| 311 | |
---|
| 312 | /* |
---|
| 313 | * I cannot move out of this directory without execute permission. |
---|
| 314 | */ |
---|
| 315 | |
---|
| 316 | if ( type != IMFS_NO_MORE_PATH ) |
---|
| 317 | if ( node->type == IMFS_DIRECTORY ) |
---|
[2f87c843] | 318 | if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_SEARCH ) ) |
---|
[07a3253d] | 319 | set_errno_and_return_minus_one( EACCES ); |
---|
| 320 | |
---|
| 321 | node = pathloc->node_access; |
---|
| 322 | |
---|
| 323 | switch( type ) { |
---|
| 324 | |
---|
| 325 | case IMFS_UP_DIR: |
---|
[b6a2d2fa] | 326 | /* |
---|
| 327 | * Am I at the root of all filesystems? (chroot'ed?) |
---|
| 328 | */ |
---|
| 329 | |
---|
| 330 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) |
---|
| 331 | break; /* Throw out the .. in this case */ |
---|
| 332 | |
---|
[07a3253d] | 333 | |
---|
| 334 | /* |
---|
| 335 | * Am I at the root of this mounted filesystem? |
---|
| 336 | */ |
---|
| 337 | |
---|
| 338 | if (pathloc->node_access == pathloc->mt_entry->mt_fs_root.node_access){ |
---|
| 339 | |
---|
| 340 | /* |
---|
| 341 | * Am I at the root of all filesystems? |
---|
| 342 | */ |
---|
| 343 | |
---|
| 344 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) { |
---|
| 345 | break; |
---|
| 346 | |
---|
| 347 | } else { |
---|
| 348 | newloc = pathloc->mt_entry->mt_point_node; |
---|
| 349 | *pathloc = newloc; |
---|
[9c3fa30] | 350 | return (*pathloc->ops->evalformake_h)( &path[i-len], pathloc, name ); |
---|
[07a3253d] | 351 | } |
---|
| 352 | } else { |
---|
| 353 | |
---|
| 354 | if ( !node->Parent ) |
---|
| 355 | set_errno_and_return_minus_one( ENOENT ); |
---|
| 356 | |
---|
| 357 | node = node->Parent; |
---|
| 358 | } |
---|
| 359 | |
---|
| 360 | pathloc->node_access = node; |
---|
| 361 | break; |
---|
| 362 | |
---|
| 363 | case IMFS_NAME: |
---|
| 364 | |
---|
| 365 | if ( node->type == IMFS_HARD_LINK ) { |
---|
| 366 | |
---|
| 367 | result = IMFS_evaluate_link( pathloc, 0 ); |
---|
| 368 | if ( result == -1 ) |
---|
| 369 | return -1; |
---|
| 370 | |
---|
| 371 | } else if ( node->type == IMFS_SYM_LINK ) { |
---|
| 372 | |
---|
| 373 | result = IMFS_evaluate_link( pathloc, 0 ); |
---|
| 374 | |
---|
| 375 | if ( result == -1 ) |
---|
| 376 | return -1; |
---|
| 377 | } |
---|
| 378 | |
---|
| 379 | node = pathloc->node_access; |
---|
| 380 | if ( !node ) |
---|
| 381 | set_errno_and_return_minus_one( ENOTDIR ); |
---|
| 382 | |
---|
| 383 | /* |
---|
| 384 | * Only a directory can be decended into. |
---|
| 385 | */ |
---|
| 386 | |
---|
| 387 | if ( node->type != IMFS_DIRECTORY ) |
---|
| 388 | set_errno_and_return_minus_one( ENOTDIR ); |
---|
| 389 | |
---|
| 390 | /* |
---|
| 391 | * If we are at a node that is a mount point. Set loc to the |
---|
| 392 | * new fs root node and let them finish evaluating the path. |
---|
| 393 | */ |
---|
| 394 | |
---|
| 395 | if ( node->info.directory.mt_fs != NULL ) { |
---|
| 396 | newloc = node->info.directory.mt_fs->mt_fs_root; |
---|
| 397 | *pathloc = newloc; |
---|
[9c3fa30] | 398 | return (*pathloc->ops->evalformake_h)( &path[i-len], pathloc, name ); |
---|
[07a3253d] | 399 | } |
---|
| 400 | |
---|
| 401 | /* |
---|
| 402 | * Otherwise find the token name in the present location. |
---|
| 403 | */ |
---|
| 404 | |
---|
| 405 | node = IMFS_find_match_in_dir( node, token ); |
---|
| 406 | |
---|
| 407 | /* |
---|
| 408 | * If there is no node we have found the name of the node we |
---|
| 409 | * wish to create. |
---|
| 410 | */ |
---|
| 411 | |
---|
| 412 | if ( ! node ) |
---|
| 413 | done = TRUE; |
---|
| 414 | else |
---|
| 415 | pathloc->node_access = node; |
---|
| 416 | |
---|
| 417 | break; |
---|
| 418 | |
---|
| 419 | case IMFS_NO_MORE_PATH: |
---|
| 420 | set_errno_and_return_minus_one( EEXIST ); |
---|
| 421 | break; |
---|
| 422 | |
---|
| 423 | case IMFS_INVALID_TOKEN: |
---|
| 424 | set_errno_and_return_minus_one( ENAMETOOLONG ); |
---|
| 425 | break; |
---|
| 426 | |
---|
| 427 | case IMFS_CURRENT_DIR: |
---|
| 428 | break; |
---|
| 429 | } |
---|
| 430 | } |
---|
| 431 | |
---|
| 432 | *name = &path[ i - len ]; |
---|
| 433 | |
---|
| 434 | /* |
---|
| 435 | * We have evaluated the path as far as we can. |
---|
| 436 | * Verify there is not any invalid stuff at the end of the name. |
---|
| 437 | */ |
---|
| 438 | |
---|
| 439 | for( ; path[i] != '\0'; i++) { |
---|
[2f87c843] | 440 | if ( !IMFS_is_separator( path[ i ] ) ) |
---|
[07a3253d] | 441 | set_errno_and_return_minus_one( ENOENT ); |
---|
| 442 | } |
---|
| 443 | |
---|
| 444 | /* |
---|
| 445 | * Verify we can execute and write to this directory. |
---|
| 446 | */ |
---|
| 447 | |
---|
| 448 | result = IMFS_Set_handlers( pathloc ); |
---|
| 449 | |
---|
| 450 | /* |
---|
| 451 | * The returned node must be a directory |
---|
| 452 | */ |
---|
| 453 | node = pathloc->node_access; |
---|
| 454 | if ( node->type != IMFS_DIRECTORY ) |
---|
| 455 | set_errno_and_return_minus_one( ENOTDIR ); |
---|
| 456 | |
---|
| 457 | /* |
---|
| 458 | * We must have Write and execute permission on the returned node. |
---|
| 459 | */ |
---|
| 460 | |
---|
[2f87c843] | 461 | if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_WX ) ) |
---|
[07a3253d] | 462 | set_errno_and_return_minus_one( EACCES ); |
---|
| 463 | |
---|
| 464 | return result; |
---|
| 465 | } |
---|
| 466 | |
---|
| 467 | |
---|
| 468 | /* |
---|
| 469 | * IMFS_eval_path |
---|
| 470 | * |
---|
| 471 | * The following routine evaluate path for a node that wishes to be |
---|
| 472 | * accessed with mode. pathloc is returned with a pointer to the |
---|
| 473 | * node to be accessed. |
---|
| 474 | */ |
---|
| 475 | |
---|
| 476 | int IMFS_eval_path( |
---|
| 477 | const char *pathname, /* IN */ |
---|
| 478 | int flags, /* IN */ |
---|
| 479 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
---|
| 480 | ) |
---|
| 481 | { |
---|
| 482 | int i = 0; |
---|
| 483 | int len; |
---|
| 484 | IMFS_token_types type = IMFS_CURRENT_DIR; |
---|
[3cf8394] | 485 | char token[ IMFS_NAME_MAX + 1 ]; |
---|
[07a3253d] | 486 | rtems_filesystem_location_info_t newloc; |
---|
| 487 | IMFS_jnode_t *node; |
---|
| 488 | int result; |
---|
| 489 | |
---|
[2f87c843] | 490 | if ( !rtems_libio_is_valid_perms( flags ) ) { |
---|
[07a3253d] | 491 | assert( 0 ); |
---|
| 492 | set_errno_and_return_minus_one( EIO ); |
---|
| 493 | } |
---|
| 494 | |
---|
| 495 | /* |
---|
| 496 | * This was filled in by the caller and is valid in the |
---|
| 497 | * mount table. |
---|
| 498 | */ |
---|
| 499 | |
---|
| 500 | node = pathloc->node_access; |
---|
| 501 | |
---|
| 502 | /* |
---|
| 503 | * Evaluate all tokens until we are done or an error occurs. |
---|
| 504 | */ |
---|
| 505 | |
---|
| 506 | while( (type != IMFS_NO_MORE_PATH) && (type != IMFS_INVALID_TOKEN) ) { |
---|
| 507 | |
---|
| 508 | type = IMFS_get_token( &pathname[i], token, &len ); |
---|
| 509 | i += len; |
---|
| 510 | |
---|
| 511 | if ( !pathloc->node_access ) |
---|
| 512 | set_errno_and_return_minus_one( ENOENT ); |
---|
| 513 | |
---|
| 514 | /* |
---|
| 515 | * I cannot move out of this directory without execute permission. |
---|
| 516 | */ |
---|
| 517 | if ( type != IMFS_NO_MORE_PATH ) |
---|
| 518 | if ( node->type == IMFS_DIRECTORY ) |
---|
[2f87c843] | 519 | if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_SEARCH ) ) |
---|
[07a3253d] | 520 | set_errno_and_return_minus_one( EACCES ); |
---|
| 521 | |
---|
| 522 | node = pathloc->node_access; |
---|
| 523 | |
---|
| 524 | switch( type ) { |
---|
| 525 | case IMFS_UP_DIR: |
---|
[b6a2d2fa] | 526 | /* |
---|
| 527 | * Am I at the root of all filesystems? (chroot'ed?) |
---|
| 528 | */ |
---|
| 529 | |
---|
| 530 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) |
---|
| 531 | break; /* Throw out the .. in this case */ |
---|
[07a3253d] | 532 | |
---|
| 533 | /* |
---|
| 534 | * Am I at the root of this mounted filesystem? |
---|
| 535 | */ |
---|
| 536 | |
---|
| 537 | if (pathloc->node_access == |
---|
| 538 | pathloc->mt_entry->mt_fs_root.node_access) { |
---|
| 539 | |
---|
| 540 | /* |
---|
| 541 | * Am I at the root of all filesystems? |
---|
| 542 | */ |
---|
| 543 | |
---|
| 544 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) { |
---|
| 545 | break; /* Throw out the .. in this case */ |
---|
| 546 | } else { |
---|
| 547 | newloc = pathloc->mt_entry->mt_point_node; |
---|
| 548 | *pathloc = newloc; |
---|
[9c3fa30] | 549 | return (*pathloc->ops->evalpath_h)(&(pathname[i-len]),flags,pathloc); |
---|
[07a3253d] | 550 | } |
---|
| 551 | } else { |
---|
| 552 | |
---|
| 553 | if ( !node->Parent ) |
---|
| 554 | set_errno_and_return_minus_one( ENOENT ); |
---|
| 555 | |
---|
| 556 | node = node->Parent; |
---|
| 557 | pathloc->node_access = node; |
---|
| 558 | |
---|
| 559 | } |
---|
| 560 | |
---|
| 561 | pathloc->node_access = node; |
---|
| 562 | break; |
---|
| 563 | |
---|
| 564 | case IMFS_NAME: |
---|
| 565 | /* |
---|
| 566 | * If we are at a link follow it. |
---|
| 567 | */ |
---|
| 568 | |
---|
| 569 | if ( node->type == IMFS_HARD_LINK ) { |
---|
| 570 | |
---|
| 571 | IMFS_evaluate_hard_link( pathloc, 0 ); |
---|
| 572 | |
---|
| 573 | node = pathloc->node_access; |
---|
| 574 | if ( !node ) |
---|
[b6a2d2fa] | 575 | set_errno_and_return_minus_one( ENOTDIR ); |
---|
[07a3253d] | 576 | |
---|
| 577 | } else if ( node->type == IMFS_SYM_LINK ) { |
---|
| 578 | |
---|
| 579 | result = IMFS_evaluate_sym_link( pathloc, 0 ); |
---|
| 580 | |
---|
| 581 | node = pathloc->node_access; |
---|
| 582 | if ( result == -1 ) |
---|
| 583 | return -1; |
---|
| 584 | } |
---|
| 585 | |
---|
| 586 | /* |
---|
| 587 | * Only a directory can be decended into. |
---|
| 588 | */ |
---|
| 589 | |
---|
| 590 | if ( node->type != IMFS_DIRECTORY ) |
---|
| 591 | set_errno_and_return_minus_one( ENOTDIR ); |
---|
| 592 | |
---|
| 593 | /* |
---|
| 594 | * If we are at a node that is a mount point. Set loc to the |
---|
| 595 | * new fs root node and let them finish evaluating the path. |
---|
| 596 | */ |
---|
| 597 | |
---|
| 598 | if ( node->info.directory.mt_fs != NULL ) { |
---|
| 599 | newloc = node->info.directory.mt_fs->mt_fs_root; |
---|
| 600 | *pathloc = newloc; |
---|
[9c3fa30] | 601 | return (*pathloc->ops->evalpath_h)( &pathname[i-len], flags, pathloc ); |
---|
[07a3253d] | 602 | } |
---|
| 603 | |
---|
| 604 | /* |
---|
| 605 | * Otherwise find the token name in the present location. |
---|
| 606 | */ |
---|
| 607 | |
---|
| 608 | node = IMFS_find_match_in_dir( node, token ); |
---|
| 609 | if ( !node ) |
---|
| 610 | set_errno_and_return_minus_one( ENOENT ); |
---|
| 611 | |
---|
| 612 | /* |
---|
| 613 | * Set the node access to the point we have found. |
---|
| 614 | */ |
---|
| 615 | |
---|
| 616 | pathloc->node_access = node; |
---|
| 617 | break; |
---|
| 618 | |
---|
| 619 | case IMFS_NO_MORE_PATH: |
---|
| 620 | case IMFS_CURRENT_DIR: |
---|
| 621 | break; |
---|
| 622 | |
---|
| 623 | case IMFS_INVALID_TOKEN: |
---|
| 624 | set_errno_and_return_minus_one( ENAMETOOLONG ); |
---|
| 625 | break; |
---|
| 626 | |
---|
| 627 | } |
---|
| 628 | } |
---|
| 629 | |
---|
| 630 | /* |
---|
[13e47e2e] | 631 | * Always return the root node. |
---|
| 632 | * |
---|
| 633 | * If we are at a node that is a mount point. Set loc to the |
---|
| 634 | * new fs root node and let let the mounted filesystem set the handlers. |
---|
| 635 | * |
---|
| 636 | * NOTE: The behavior of stat() on a mount point appears to be questionable. |
---|
[07a3253d] | 637 | */ |
---|
| 638 | |
---|
[13e47e2e] | 639 | if ( node->type == IMFS_DIRECTORY ) { |
---|
| 640 | if ( node->info.directory.mt_fs != NULL ) { |
---|
| 641 | newloc = node->info.directory.mt_fs->mt_fs_root; |
---|
| 642 | *pathloc = newloc; |
---|
| 643 | return (*pathloc->ops->evalpath_h)( &pathname[i-len], flags, pathloc ); |
---|
| 644 | } else { |
---|
| 645 | result = IMFS_Set_handlers( pathloc ); |
---|
| 646 | } |
---|
| 647 | } else { |
---|
| 648 | result = IMFS_Set_handlers( pathloc ); |
---|
[07a3253d] | 649 | } |
---|
| 650 | |
---|
| 651 | /* |
---|
| 652 | * Verify we have the correct permissions for this node. |
---|
| 653 | */ |
---|
| 654 | |
---|
[2f87c843] | 655 | if ( !IMFS_evaluate_permission( pathloc, flags ) ) |
---|
[07a3253d] | 656 | set_errno_and_return_minus_one( EACCES ); |
---|
| 657 | |
---|
| 658 | return result; |
---|
| 659 | } |
---|