| 1 | /* |
| 2 | * Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #include <common/compat/directory-handle.h> |
| 19 | #include <common/error.h> |
| 20 | #include <common/macros.h> |
| 21 | #include <common/runas.h> |
| 22 | #include <common/credentials.h> |
| 23 | #include <lttng/constant.h> |
| 24 | #include <common/dynamic-array.h> |
| 25 | |
| 26 | #include <assert.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/stat.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <unistd.h> |
| 31 | #include <dirent.h> |
| 32 | |
| 33 | /* |
| 34 | * This compatibility layer shares a common "base" that is implemented |
| 35 | * in terms of an internal API. This file contains two implementations |
| 36 | * of the internal API below. |
| 37 | */ |
| 38 | static |
| 39 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, |
| 40 | const char *path, struct stat *st); |
| 41 | static |
| 42 | int lttng_directory_handle_mkdir( |
| 43 | const struct lttng_directory_handle *handle, |
| 44 | const char *path, mode_t mode); |
| 45 | static |
| 46 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, |
| 47 | mode_t mode, uid_t uid, gid_t gid); |
| 48 | static |
| 49 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, |
| 50 | const char *path, mode_t mode, uid_t uid, gid_t gid); |
| 51 | static |
| 52 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
| 53 | const char *filename, int flags, mode_t mode); |
| 54 | static |
| 55 | int _run_as_open(const struct lttng_directory_handle *handle, |
| 56 | const char *filename, |
| 57 | int flags, mode_t mode, uid_t uid, gid_t gid); |
| 58 | static |
| 59 | int lttng_directory_handle_unlink( |
| 60 | const struct lttng_directory_handle *handle, |
| 61 | const char *filename); |
| 62 | static |
| 63 | int _run_as_unlink(const struct lttng_directory_handle *handle, |
| 64 | const char *filename, uid_t uid, gid_t gid); |
| 65 | static |
| 66 | int _lttng_directory_handle_rename( |
| 67 | const struct lttng_directory_handle *old_handle, |
| 68 | const char *old_name, |
| 69 | const struct lttng_directory_handle *new_handle, |
| 70 | const char *new_name); |
| 71 | static |
| 72 | int _run_as_rename(const struct lttng_directory_handle *old_handle, |
| 73 | const char *old_name, |
| 74 | const struct lttng_directory_handle *new_handle, |
| 75 | const char *new_name, uid_t uid, gid_t gid); |
| 76 | static |
| 77 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, |
| 78 | const char *path); |
| 79 | static |
| 80 | int lttng_directory_handle_rmdir( |
| 81 | const struct lttng_directory_handle *handle, const char *name); |
| 82 | static |
| 83 | int _run_as_rmdir(const struct lttng_directory_handle *handle, |
| 84 | const char *name, uid_t uid, gid_t gid); |
| 85 | static |
| 86 | int _run_as_rmdir_recursive( |
| 87 | const struct lttng_directory_handle *handle, const char *name, |
| 88 | uid_t uid, gid_t gid, int flags); |
| 89 | static |
| 90 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle); |
| 91 | static |
| 92 | void lttng_directory_handle_release(struct urcu_ref *ref); |
| 93 | |
| 94 | #ifdef COMPAT_DIRFD |
| 95 | |
| 96 | /* |
| 97 | * Special inode number reserved to represent the "current working directory". |
| 98 | * ino_t is spec'ed as being an unsigned integral type. |
| 99 | */ |
| 100 | #define RESERVED_AT_FDCWD_INO \ |
| 101 | ({ \ |
| 102 | uint64_t reserved_val; \ |
| 103 | switch (sizeof(ino_t)) { \ |
| 104 | case 4: \ |
| 105 | reserved_val = UINT32_MAX; \ |
| 106 | break; \ |
| 107 | case 8: \ |
| 108 | reserved_val = UINT64_MAX; \ |
| 109 | break; \ |
| 110 | default: \ |
| 111 | abort(); \ |
| 112 | } \ |
| 113 | (ino_t) reserved_val; \ |
| 114 | }) |
| 115 | |
| 116 | LTTNG_HIDDEN |
| 117 | struct lttng_directory_handle *lttng_directory_handle_create(const char *path) |
| 118 | { |
| 119 | const struct lttng_directory_handle cwd_handle = { |
| 120 | .dirfd = AT_FDCWD, |
| 121 | }; |
| 122 | |
| 123 | /* Open a handle to the CWD if NULL is passed. */ |
| 124 | return lttng_directory_handle_create_from_handle(path, &cwd_handle); |
| 125 | } |
| 126 | |
| 127 | LTTNG_HIDDEN |
| 128 | struct lttng_directory_handle *lttng_directory_handle_create_from_handle( |
| 129 | const char *path, |
| 130 | const struct lttng_directory_handle *ref_handle) |
| 131 | { |
| 132 | int dirfd; |
| 133 | struct lttng_directory_handle *handle = NULL; |
| 134 | |
| 135 | if (!path) { |
| 136 | handle = lttng_directory_handle_copy(ref_handle); |
| 137 | goto end; |
| 138 | } |
| 139 | if (!*path) { |
| 140 | ERR("Failed to initialize directory handle: provided path is an empty string"); |
| 141 | goto end; |
| 142 | } |
| 143 | |
| 144 | dirfd = openat(ref_handle->dirfd, path, O_RDONLY | O_DIRECTORY | O_CLOEXEC); |
| 145 | if (dirfd == -1) { |
| 146 | PERROR("Failed to initialize directory handle to \"%s\"", path); |
| 147 | goto end; |
| 148 | } |
| 149 | |
| 150 | handle = lttng_directory_handle_create_from_dirfd(dirfd); |
| 151 | if (!handle) { |
| 152 | goto error_close; |
| 153 | } |
| 154 | end: |
| 155 | return handle; |
| 156 | error_close: |
| 157 | if (close(dirfd)) { |
| 158 | PERROR("Failed to close directory file descriptor"); |
| 159 | } |
| 160 | return NULL; |
| 161 | } |
| 162 | |
| 163 | LTTNG_HIDDEN |
| 164 | struct lttng_directory_handle *lttng_directory_handle_create_from_dirfd( |
| 165 | int dirfd) |
| 166 | { |
| 167 | int ret; |
| 168 | struct lttng_directory_handle *handle = zmalloc(sizeof(*handle)); |
| 169 | struct stat stat_buf; |
| 170 | |
| 171 | if (!handle) { |
| 172 | goto end; |
| 173 | } |
| 174 | |
| 175 | if (dirfd != AT_FDCWD) { |
| 176 | ret = fstat(dirfd, &stat_buf); |
| 177 | if (ret) { |
| 178 | PERROR("Failed to fstat directory file descriptor %i", dirfd); |
| 179 | lttng_directory_handle_release(&handle->ref); |
| 180 | } |
| 181 | } else { |
| 182 | handle->directory_inode = RESERVED_AT_FDCWD_INO; |
| 183 | } |
| 184 | handle->dirfd = dirfd; |
| 185 | urcu_ref_init(&handle->ref); |
| 186 | end: |
| 187 | return handle; |
| 188 | } |
| 189 | |
| 190 | static |
| 191 | void lttng_directory_handle_release(struct urcu_ref *ref) |
| 192 | { |
| 193 | int ret; |
| 194 | struct lttng_directory_handle *handle = |
| 195 | container_of(ref, struct lttng_directory_handle, ref); |
| 196 | |
| 197 | if (handle->dirfd == AT_FDCWD || handle->dirfd == -1) { |
| 198 | goto end; |
| 199 | } |
| 200 | ret = close(handle->dirfd); |
| 201 | if (ret == -1) { |
| 202 | PERROR("Failed to close directory file descriptor of directory handle"); |
| 203 | } |
| 204 | end: |
| 205 | lttng_directory_handle_invalidate(handle); |
| 206 | free(handle); |
| 207 | } |
| 208 | |
| 209 | LTTNG_HIDDEN |
| 210 | struct lttng_directory_handle *lttng_directory_handle_copy( |
| 211 | const struct lttng_directory_handle *handle) |
| 212 | { |
| 213 | struct lttng_directory_handle *new_handle = NULL; |
| 214 | |
| 215 | if (handle->dirfd == AT_FDCWD) { |
| 216 | new_handle = lttng_directory_handle_create_from_dirfd(AT_FDCWD); |
| 217 | } else { |
| 218 | const int new_dirfd = dup(handle->dirfd); |
| 219 | |
| 220 | if (new_dirfd == -1) { |
| 221 | PERROR("Failed to duplicate directory file descriptor of directory handle"); |
| 222 | goto end; |
| 223 | } |
| 224 | new_handle = lttng_directory_handle_create_from_dirfd( |
| 225 | new_dirfd); |
| 226 | if (!new_handle && close(new_dirfd)) { |
| 227 | PERROR("Failed to close directory file descriptor of directory handle"); |
| 228 | } |
| 229 | } |
| 230 | end: |
| 231 | return new_handle; |
| 232 | } |
| 233 | |
| 234 | LTTNG_HIDDEN |
| 235 | bool lttng_directory_handle_equals(const struct lttng_directory_handle *lhs, |
| 236 | const struct lttng_directory_handle *rhs) |
| 237 | { |
| 238 | return lhs->directory_inode == rhs->directory_inode; |
| 239 | } |
| 240 | |
| 241 | static |
| 242 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) |
| 243 | { |
| 244 | handle->dirfd = -1; |
| 245 | } |
| 246 | |
| 247 | static |
| 248 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, |
| 249 | const char *path, struct stat *st) |
| 250 | { |
| 251 | return fstatat(handle->dirfd, path, st, 0); |
| 252 | } |
| 253 | |
| 254 | static |
| 255 | int lttng_directory_handle_mkdir( |
| 256 | const struct lttng_directory_handle *handle, |
| 257 | const char *path, mode_t mode) |
| 258 | { |
| 259 | return mkdirat(handle->dirfd, path, mode); |
| 260 | } |
| 261 | |
| 262 | static |
| 263 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
| 264 | const char *filename, int flags, mode_t mode) |
| 265 | { |
| 266 | return openat(handle->dirfd, filename, flags, mode); |
| 267 | } |
| 268 | |
| 269 | static |
| 270 | int _run_as_open(const struct lttng_directory_handle *handle, |
| 271 | const char *filename, |
| 272 | int flags, mode_t mode, uid_t uid, gid_t gid) |
| 273 | { |
| 274 | return run_as_openat(handle->dirfd, filename, flags, mode, uid, gid); |
| 275 | } |
| 276 | |
| 277 | static |
| 278 | int _run_as_unlink(const struct lttng_directory_handle *handle, |
| 279 | const char *filename, uid_t uid, gid_t gid) |
| 280 | { |
| 281 | return run_as_unlinkat(handle->dirfd, filename, uid, gid); |
| 282 | } |
| 283 | |
| 284 | static |
| 285 | int lttng_directory_handle_unlink( |
| 286 | const struct lttng_directory_handle *handle, |
| 287 | const char *filename) |
| 288 | { |
| 289 | return unlinkat(handle->dirfd, filename, 0); |
| 290 | } |
| 291 | |
| 292 | static |
| 293 | int _run_as_mkdir(const struct lttng_directory_handle *handle, |
| 294 | const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 295 | { |
| 296 | return run_as_mkdirat(handle->dirfd, path, mode, uid, gid); |
| 297 | } |
| 298 | |
| 299 | static |
| 300 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, |
| 301 | const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 302 | { |
| 303 | return run_as_mkdirat_recursive(handle->dirfd, path, mode, uid, gid); |
| 304 | } |
| 305 | |
| 306 | static |
| 307 | int _lttng_directory_handle_rename( |
| 308 | const struct lttng_directory_handle *old_handle, |
| 309 | const char *old_name, |
| 310 | const struct lttng_directory_handle *new_handle, |
| 311 | const char *new_name) |
| 312 | { |
| 313 | return renameat(old_handle->dirfd, old_name, |
| 314 | new_handle->dirfd, new_name); |
| 315 | } |
| 316 | |
| 317 | static |
| 318 | int _run_as_rename(const struct lttng_directory_handle *old_handle, |
| 319 | const char *old_name, |
| 320 | const struct lttng_directory_handle *new_handle, |
| 321 | const char *new_name, uid_t uid, gid_t gid) |
| 322 | { |
| 323 | return run_as_renameat(old_handle->dirfd, old_name, new_handle->dirfd, |
| 324 | new_name, uid, gid); |
| 325 | } |
| 326 | |
| 327 | static |
| 328 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, |
| 329 | const char *path) |
| 330 | { |
| 331 | DIR *dir_stream = NULL; |
| 332 | int fd = openat(handle->dirfd, path, O_RDONLY); |
| 333 | |
| 334 | if (fd < 0) { |
| 335 | goto end; |
| 336 | } |
| 337 | |
| 338 | dir_stream = fdopendir(fd); |
| 339 | if (!dir_stream) { |
| 340 | int ret; |
| 341 | |
| 342 | PERROR("Failed to open directory stream"); |
| 343 | ret = close(fd); |
| 344 | if (ret) { |
| 345 | PERROR("Failed to close file descriptor to %s", path); |
| 346 | } |
| 347 | goto end; |
| 348 | } |
| 349 | |
| 350 | end: |
| 351 | return dir_stream; |
| 352 | } |
| 353 | |
| 354 | static |
| 355 | int lttng_directory_handle_rmdir( |
| 356 | const struct lttng_directory_handle *handle, const char *name) |
| 357 | { |
| 358 | return unlinkat(handle->dirfd, name, AT_REMOVEDIR); |
| 359 | } |
| 360 | |
| 361 | static |
| 362 | int _run_as_rmdir(const struct lttng_directory_handle *handle, |
| 363 | const char *name, uid_t uid, gid_t gid) |
| 364 | { |
| 365 | return run_as_rmdirat(handle->dirfd, name, uid, gid); |
| 366 | } |
| 367 | |
| 368 | static |
| 369 | int _run_as_rmdir_recursive( |
| 370 | const struct lttng_directory_handle *handle, const char *name, |
| 371 | uid_t uid, gid_t gid, int flags) |
| 372 | { |
| 373 | return run_as_rmdirat_recursive(handle->dirfd, name, uid, gid, flags); |
| 374 | } |
| 375 | |
| 376 | #else /* COMPAT_DIRFD */ |
| 377 | |
| 378 | static |
| 379 | int get_full_path(const struct lttng_directory_handle *handle, |
| 380 | const char *subdirectory, char *fullpath, size_t size) |
| 381 | { |
| 382 | int ret; |
| 383 | const bool subdirectory_is_absolute = |
| 384 | subdirectory && *subdirectory == '/'; |
| 385 | const char * const base = subdirectory_is_absolute ? |
| 386 | subdirectory : handle->base_path; |
| 387 | const char * const end = subdirectory && !subdirectory_is_absolute ? |
| 388 | subdirectory : NULL; |
| 389 | const size_t base_len = strlen(base); |
| 390 | const size_t end_len = end ? strlen(end) : 0; |
| 391 | const bool add_separator_slash = end && base[base_len - 1] != '/'; |
| 392 | const bool add_trailing_slash = end && end[end_len - 1] != '/'; |
| 393 | |
| 394 | ret = snprintf(fullpath, size, "%s%s%s%s", |
| 395 | base, |
| 396 | add_separator_slash ? "/" : "", |
| 397 | end ? end : "", |
| 398 | add_trailing_slash ? "/" : ""); |
| 399 | if (ret == -1 || ret >= size) { |
| 400 | ERR("Failed to format subdirectory from directory handle"); |
| 401 | ret = -1; |
| 402 | goto end; |
| 403 | } |
| 404 | ret = 0; |
| 405 | end: |
| 406 | return ret; |
| 407 | } |
| 408 | |
| 409 | static |
| 410 | struct lttng_directory_handle *_lttng_directory_handle_create(char *path) |
| 411 | { |
| 412 | struct lttng_directory_handle *handle = zmalloc(sizeof(*handle)); |
| 413 | |
| 414 | if (!handle) { |
| 415 | goto end; |
| 416 | } |
| 417 | urcu_ref_init(&handle->ref); |
| 418 | handle->base_path = path; |
| 419 | end: |
| 420 | return handle; |
| 421 | } |
| 422 | |
| 423 | LTTNG_HIDDEN |
| 424 | struct lttng_directory_handle *lttng_directory_handle_create( |
| 425 | const char *path) |
| 426 | { |
| 427 | int ret; |
| 428 | const char *cwd = ""; |
| 429 | size_t cwd_len, path_len; |
| 430 | char cwd_buf[LTTNG_PATH_MAX] = {}; |
| 431 | char handle_buf[LTTNG_PATH_MAX] = {}; |
| 432 | struct lttng_directory_handle *new_handle = NULL; |
| 433 | bool add_cwd_slash = false, add_trailing_slash = false; |
| 434 | const struct lttng_directory_handle cwd_handle = { |
| 435 | .base_path = handle_buf, |
| 436 | }; |
| 437 | |
| 438 | path_len = path ? strlen(path) : 0; |
| 439 | add_trailing_slash = path && path[path_len - 1] != '/'; |
| 440 | if (!path || (path && *path != '/')) { |
| 441 | cwd = getcwd(cwd_buf, sizeof(cwd_buf)); |
| 442 | if (!cwd) { |
| 443 | PERROR("Failed to initialize directory handle, can't get current working directory"); |
| 444 | ret = -1; |
| 445 | goto end; |
| 446 | } |
| 447 | cwd_len = strlen(cwd); |
| 448 | if (cwd_len == 0) { |
| 449 | ERR("Failed to initialize directory handle, current working directory path has a length of 0"); |
| 450 | ret = -1; |
| 451 | goto end; |
| 452 | } |
| 453 | add_cwd_slash = cwd[cwd_len - 1] != '/'; |
| 454 | } |
| 455 | |
| 456 | ret = snprintf(handle_buf, sizeof(handle_buf), "%s%s%s%s", |
| 457 | cwd, |
| 458 | add_cwd_slash ? "/" : "", |
| 459 | path ? : "", |
| 460 | add_trailing_slash ? "/" : ""); |
| 461 | if (ret == -1 || ret >= LTTNG_PATH_MAX) { |
| 462 | ERR("Failed to initialize directory handle, failed to format directory path"); |
| 463 | goto end; |
| 464 | } |
| 465 | |
| 466 | new_handle = lttng_directory_handle_create_from_handle(path, &cwd_handle); |
| 467 | end: |
| 468 | return new_handle; |
| 469 | } |
| 470 | |
| 471 | LTTNG_HIDDEN |
| 472 | struct lttng_directory_handle *lttng_directory_handle_create_from_handle( |
| 473 | const char *path, |
| 474 | const struct lttng_directory_handle *ref_handle) |
| 475 | { |
| 476 | int ret; |
| 477 | size_t path_len, handle_path_len; |
| 478 | bool add_trailing_slash; |
| 479 | struct stat stat_buf; |
| 480 | struct lttng_directory_handle *new_handle = NULL; |
| 481 | char *new_path = NULL; |
| 482 | |
| 483 | assert(ref_handle && ref_handle->base_path); |
| 484 | |
| 485 | ret = lttng_directory_handle_stat(ref_handle, path, &stat_buf); |
| 486 | if (ret == -1) { |
| 487 | PERROR("Failed to create directory handle"); |
| 488 | goto end; |
| 489 | } else if (!S_ISDIR(stat_buf.st_mode)) { |
| 490 | char full_path[LTTNG_PATH_MAX]; |
| 491 | |
| 492 | /* Best effort for logging purposes. */ |
| 493 | ret = get_full_path(ref_handle, path, full_path, |
| 494 | sizeof(full_path)); |
| 495 | if (ret) { |
| 496 | full_path[0] = '\0'; |
| 497 | } |
| 498 | |
| 499 | ERR("Failed to initialize directory handle to \"%s\": not a directory", |
| 500 | full_path); |
| 501 | goto end; |
| 502 | } |
| 503 | if (!path) { |
| 504 | new_handle = lttng_directory_handle_copy(ref_handle); |
| 505 | goto end; |
| 506 | } |
| 507 | |
| 508 | path_len = strlen(path); |
| 509 | if (path_len == 0) { |
| 510 | ERR("Failed to initialize directory handle: provided path is an empty string"); |
| 511 | ret = -1; |
| 512 | goto end; |
| 513 | } |
| 514 | if (*path == '/') { |
| 515 | new_path = strdup(path); |
| 516 | if (!new_path) { |
| 517 | goto end; |
| 518 | } |
| 519 | /* Takes ownership of new_path. */ |
| 520 | new_handle = _lttng_directory_handle_create(new_path); |
| 521 | new_path = NULL; |
| 522 | goto end; |
| 523 | } |
| 524 | |
| 525 | add_trailing_slash = path[path_len - 1] != '/'; |
| 526 | |
| 527 | handle_path_len = strlen(ref_handle->base_path) + path_len + |
| 528 | !!add_trailing_slash; |
| 529 | if (handle_path_len >= LTTNG_PATH_MAX) { |
| 530 | ERR("Failed to initialize directory handle as the resulting path's length (%zu bytes) exceeds the maximal allowed length (%d bytes)", |
| 531 | handle_path_len, LTTNG_PATH_MAX); |
| 532 | goto end; |
| 533 | } |
| 534 | new_path = zmalloc(handle_path_len); |
| 535 | if (!new_path) { |
| 536 | PERROR("Failed to initialize directory handle"); |
| 537 | goto end; |
| 538 | } |
| 539 | |
| 540 | ret = sprintf(new_handle->base_path, "%s%s%s", |
| 541 | ref_handle->base_path, |
| 542 | path, |
| 543 | add_trailing_slash ? "/" : ""); |
| 544 | if (ret == -1 || ret >= handle_path_len) { |
| 545 | ERR("Failed to initialize directory handle: path formatting failed"); |
| 546 | goto end; |
| 547 | } |
| 548 | new_handle = _lttng_directory_handle_create(new_path); |
| 549 | new_path = NULL; |
| 550 | end: |
| 551 | free(new_path); |
| 552 | return new_handle; |
| 553 | } |
| 554 | |
| 555 | LTTNG_HIDDEN |
| 556 | struct lttng_directory_handle *lttng_directory_handle_create_from_dirfd( |
| 557 | int dirfd) |
| 558 | { |
| 559 | assert(dirfd == AT_FDCWD); |
| 560 | return lttng_directory_handle_create(NULL); |
| 561 | } |
| 562 | |
| 563 | static |
| 564 | void lttng_directory_handle_release(struct urcu_ref *ref) |
| 565 | { |
| 566 | struct lttng_directory_handle *handle = |
| 567 | container_of(ref, struct lttng_directory_handle, ref); |
| 568 | |
| 569 | free(handle->base_path); |
| 570 | lttng_directory_handle_invalidate(handle); |
| 571 | free(handle); |
| 572 | } |
| 573 | |
| 574 | LTTNG_HIDDEN |
| 575 | struct lttng_directory_handle *lttng_directory_handle_copy( |
| 576 | const struct lttng_directory_handle *handle) |
| 577 | { |
| 578 | struct lttng_directory_handle *new_handle = NULL; |
| 579 | char *new_path = NULL; |
| 580 | |
| 581 | if (handle->base_path) { |
| 582 | new_path = strdup(handle->base_path); |
| 583 | if (!new_path) { |
| 584 | goto end; |
| 585 | } |
| 586 | } |
| 587 | new_handle = _lttng_directory_handle_create(new_path); |
| 588 | end: |
| 589 | return new_handle; |
| 590 | } |
| 591 | |
| 592 | LTTNG_HIDDEN |
| 593 | bool lttng_directory_handle_equals(const struct lttng_directory_handle *lhs, |
| 594 | const struct lttng_directory_handle *rhs) |
| 595 | { |
| 596 | return strcmp(lhs->path, rhs->path) == 0; |
| 597 | } |
| 598 | |
| 599 | static |
| 600 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) |
| 601 | { |
| 602 | handle->base_path = NULL; |
| 603 | } |
| 604 | |
| 605 | static |
| 606 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, |
| 607 | const char *subdirectory, struct stat *st) |
| 608 | { |
| 609 | int ret; |
| 610 | char fullpath[LTTNG_PATH_MAX]; |
| 611 | |
| 612 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); |
| 613 | if (ret) { |
| 614 | errno = ENOMEM; |
| 615 | goto end; |
| 616 | } |
| 617 | |
| 618 | ret = stat(fullpath, st); |
| 619 | end: |
| 620 | return ret; |
| 621 | } |
| 622 | |
| 623 | static |
| 624 | int lttng_directory_handle_mkdir(const struct lttng_directory_handle *handle, |
| 625 | const char *subdirectory, mode_t mode) |
| 626 | { |
| 627 | int ret; |
| 628 | char fullpath[LTTNG_PATH_MAX]; |
| 629 | |
| 630 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); |
| 631 | if (ret) { |
| 632 | errno = ENOMEM; |
| 633 | goto end; |
| 634 | } |
| 635 | |
| 636 | ret = mkdir(fullpath, mode); |
| 637 | end: |
| 638 | return ret; |
| 639 | } |
| 640 | |
| 641 | static |
| 642 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
| 643 | const char *filename, int flags, mode_t mode) |
| 644 | { |
| 645 | int ret; |
| 646 | char fullpath[LTTNG_PATH_MAX]; |
| 647 | |
| 648 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 649 | if (ret) { |
| 650 | errno = ENOMEM; |
| 651 | goto end; |
| 652 | } |
| 653 | |
| 654 | ret = open(fullpath, flags, mode); |
| 655 | end: |
| 656 | return ret; |
| 657 | } |
| 658 | |
| 659 | static |
| 660 | int lttng_directory_handle_unlink( |
| 661 | const struct lttng_directory_handle *handle, |
| 662 | const char *filename) |
| 663 | { |
| 664 | int ret; |
| 665 | char fullpath[LTTNG_PATH_MAX]; |
| 666 | |
| 667 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 668 | if (ret) { |
| 669 | errno = ENOMEM; |
| 670 | goto end; |
| 671 | } |
| 672 | |
| 673 | ret = unlink(fullpath); |
| 674 | end: |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | static |
| 679 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, |
| 680 | mode_t mode, uid_t uid, gid_t gid) |
| 681 | { |
| 682 | int ret; |
| 683 | char fullpath[LTTNG_PATH_MAX]; |
| 684 | |
| 685 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); |
| 686 | if (ret) { |
| 687 | errno = ENOMEM; |
| 688 | goto end; |
| 689 | } |
| 690 | |
| 691 | ret = run_as_mkdir(fullpath, mode, uid, gid); |
| 692 | end: |
| 693 | return ret; |
| 694 | } |
| 695 | |
| 696 | static |
| 697 | int _run_as_open(const struct lttng_directory_handle *handle, |
| 698 | const char *filename, |
| 699 | int flags, mode_t mode, uid_t uid, gid_t gid) |
| 700 | { |
| 701 | int ret; |
| 702 | char fullpath[LTTNG_PATH_MAX]; |
| 703 | |
| 704 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 705 | if (ret) { |
| 706 | errno = ENOMEM; |
| 707 | goto end; |
| 708 | } |
| 709 | |
| 710 | ret = run_as_open(fullpath, flags, mode, uid, gid); |
| 711 | end: |
| 712 | return ret; |
| 713 | } |
| 714 | |
| 715 | static |
| 716 | int _run_as_unlink(const struct lttng_directory_handle *handle, |
| 717 | const char *filename, uid_t uid, gid_t gid) |
| 718 | { |
| 719 | int ret; |
| 720 | char fullpath[LTTNG_PATH_MAX]; |
| 721 | |
| 722 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 723 | if (ret) { |
| 724 | errno = ENOMEM; |
| 725 | goto end; |
| 726 | } |
| 727 | |
| 728 | ret = run_as_unlink(fullpath, uid, gid); |
| 729 | end: |
| 730 | return ret; |
| 731 | } |
| 732 | |
| 733 | static |
| 734 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, |
| 735 | const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 736 | { |
| 737 | int ret; |
| 738 | char fullpath[LTTNG_PATH_MAX]; |
| 739 | |
| 740 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); |
| 741 | if (ret) { |
| 742 | errno = ENOMEM; |
| 743 | goto end; |
| 744 | } |
| 745 | |
| 746 | ret = run_as_mkdir_recursive(fullpath, mode, uid, gid); |
| 747 | end: |
| 748 | return ret; |
| 749 | } |
| 750 | |
| 751 | static |
| 752 | int _lttng_directory_handle_rename( |
| 753 | const struct lttng_directory_handle *old_handle, |
| 754 | const char *old_name, |
| 755 | const struct lttng_directory_handle *new_handle, |
| 756 | const char *new_name) |
| 757 | { |
| 758 | int ret; |
| 759 | char old_fullpath[LTTNG_PATH_MAX]; |
| 760 | char new_fullpath[LTTNG_PATH_MAX]; |
| 761 | |
| 762 | ret = get_full_path(old_handle, old_name, old_fullpath, |
| 763 | sizeof(old_fullpath)); |
| 764 | if (ret) { |
| 765 | errno = ENOMEM; |
| 766 | goto end; |
| 767 | } |
| 768 | ret = get_full_path(new_handle, new_name, new_fullpath, |
| 769 | sizeof(new_fullpath)); |
| 770 | if (ret) { |
| 771 | errno = ENOMEM; |
| 772 | goto end; |
| 773 | } |
| 774 | |
| 775 | ret = rename(old_fullpath, new_fullpath); |
| 776 | end: |
| 777 | return ret; |
| 778 | } |
| 779 | |
| 780 | static |
| 781 | int _run_as_rename(const struct lttng_directory_handle *old_handle, |
| 782 | const char *old_name, |
| 783 | const struct lttng_directory_handle *new_handle, |
| 784 | const char *new_name, uid_t uid, gid_t gid) |
| 785 | { |
| 786 | int ret; |
| 787 | char old_fullpath[LTTNG_PATH_MAX]; |
| 788 | char new_fullpath[LTTNG_PATH_MAX]; |
| 789 | |
| 790 | ret = get_full_path(old_handle, old_name, old_fullpath, |
| 791 | sizeof(old_fullpath)); |
| 792 | if (ret) { |
| 793 | errno = ENOMEM; |
| 794 | goto end; |
| 795 | } |
| 796 | ret = get_full_path(new_handle, new_name, new_fullpath, |
| 797 | sizeof(new_fullpath)); |
| 798 | if (ret) { |
| 799 | errno = ENOMEM; |
| 800 | goto end; |
| 801 | } |
| 802 | |
| 803 | ret = run_as_rename(old_fullpath, new_fullpath, uid, gid); |
| 804 | end: |
| 805 | return ret; |
| 806 | } |
| 807 | |
| 808 | static |
| 809 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, |
| 810 | const char *path) |
| 811 | { |
| 812 | int ret; |
| 813 | DIR *dir_stream = NULL; |
| 814 | char fullpath[LTTNG_PATH_MAX]; |
| 815 | |
| 816 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); |
| 817 | if (ret) { |
| 818 | errno = ENOMEM; |
| 819 | goto end; |
| 820 | } |
| 821 | |
| 822 | dir_stream = opendir(fullpath); |
| 823 | end: |
| 824 | return dir_stream; |
| 825 | } |
| 826 | |
| 827 | static |
| 828 | int lttng_directory_handle_rmdir( |
| 829 | const struct lttng_directory_handle *handle, const char *name) |
| 830 | { |
| 831 | int ret; |
| 832 | char fullpath[LTTNG_PATH_MAX]; |
| 833 | |
| 834 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); |
| 835 | if (ret) { |
| 836 | errno = ENOMEM; |
| 837 | goto end; |
| 838 | } |
| 839 | |
| 840 | ret = rmdir(fullpath); |
| 841 | end: |
| 842 | return ret; |
| 843 | } |
| 844 | |
| 845 | static |
| 846 | int _run_as_rmdir(const struct lttng_directory_handle *handle, |
| 847 | const char *name, uid_t uid, gid_t gid) |
| 848 | { |
| 849 | int ret; |
| 850 | char fullpath[LTTNG_PATH_MAX]; |
| 851 | |
| 852 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); |
| 853 | if (ret) { |
| 854 | errno = ENOMEM; |
| 855 | goto end; |
| 856 | } |
| 857 | |
| 858 | ret = run_as_rmdir(fullpath, uid, gid); |
| 859 | end: |
| 860 | return ret; |
| 861 | } |
| 862 | |
| 863 | static |
| 864 | int _run_as_rmdir_recursive( |
| 865 | const struct lttng_directory_handle *handle, const char *name, |
| 866 | uid_t uid, gid_t gid, int flags) |
| 867 | { |
| 868 | int ret; |
| 869 | char fullpath[LTTNG_PATH_MAX]; |
| 870 | |
| 871 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); |
| 872 | if (ret) { |
| 873 | errno = ENOMEM; |
| 874 | goto end; |
| 875 | } |
| 876 | |
| 877 | ret = run_as_rmdir_recursive(fullpath, uid, gid, flags); |
| 878 | end: |
| 879 | return ret; |
| 880 | } |
| 881 | |
| 882 | #endif /* COMPAT_DIRFD */ |
| 883 | |
| 884 | /* Common implementation. */ |
| 885 | |
| 886 | /* |
| 887 | * On some filesystems (e.g. nfs), mkdir will validate access rights before |
| 888 | * checking for the existence of the path element. This means that on a setup |
| 889 | * where "/home/" is a mounted NFS share, and running as an unpriviledged user, |
| 890 | * recursively creating a path of the form "/home/my_user/trace/" will fail with |
| 891 | * EACCES on mkdir("/home", ...). |
| 892 | * |
| 893 | * Checking the path for existence allows us to work around this behaviour. |
| 894 | */ |
| 895 | static |
| 896 | int create_directory_check_exists(const struct lttng_directory_handle *handle, |
| 897 | const char *path, mode_t mode) |
| 898 | { |
| 899 | int ret = 0; |
| 900 | struct stat st; |
| 901 | |
| 902 | ret = lttng_directory_handle_stat(handle, path, &st); |
| 903 | if (ret == 0) { |
| 904 | if (S_ISDIR(st.st_mode)) { |
| 905 | /* Directory exists, skip. */ |
| 906 | goto end; |
| 907 | } else { |
| 908 | /* Exists, but is not a directory. */ |
| 909 | errno = ENOTDIR; |
| 910 | ret = -1; |
| 911 | goto end; |
| 912 | } |
| 913 | } else if (errno != ENOENT) { |
| 914 | goto end; |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * Let mkdir handle other errors as the caller expects mkdir |
| 919 | * semantics. |
| 920 | */ |
| 921 | ret = lttng_directory_handle_mkdir(handle, path, mode); |
| 922 | end: |
| 923 | return ret; |
| 924 | } |
| 925 | |
| 926 | static |
| 927 | int create_directory_recursive(const struct lttng_directory_handle *handle, |
| 928 | const char *path, mode_t mode) |
| 929 | { |
| 930 | char *p, tmp[LTTNG_PATH_MAX]; |
| 931 | size_t len; |
| 932 | int ret; |
| 933 | |
| 934 | assert(path); |
| 935 | |
| 936 | ret = lttng_strncpy(tmp, path, sizeof(tmp)); |
| 937 | if (ret) { |
| 938 | ERR("Failed to create directory: provided path's length (%zu bytes) exceeds the maximal allowed length (%zu bytes)", |
| 939 | strlen(path) + 1, sizeof(tmp)); |
| 940 | goto error; |
| 941 | } |
| 942 | |
| 943 | len = strlen(path); |
| 944 | if (tmp[len - 1] == '/') { |
| 945 | tmp[len - 1] = 0; |
| 946 | } |
| 947 | |
| 948 | for (p = tmp + 1; *p; p++) { |
| 949 | if (*p == '/') { |
| 950 | *p = 0; |
| 951 | if (tmp[strlen(tmp) - 1] == '.' && |
| 952 | tmp[strlen(tmp) - 2] == '.' && |
| 953 | tmp[strlen(tmp) - 3] == '/') { |
| 954 | ERR("Using '/../' is not permitted in the trace path (%s)", |
| 955 | tmp); |
| 956 | ret = -1; |
| 957 | goto error; |
| 958 | } |
| 959 | ret = create_directory_check_exists(handle, tmp, mode); |
| 960 | if (ret < 0) { |
| 961 | if (errno != EACCES) { |
| 962 | PERROR("Failed to create directory \"%s\"", |
| 963 | path); |
| 964 | ret = -errno; |
| 965 | goto error; |
| 966 | } |
| 967 | } |
| 968 | *p = '/'; |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | ret = create_directory_check_exists(handle, tmp, mode); |
| 973 | if (ret < 0) { |
| 974 | PERROR("mkdirat recursive last element"); |
| 975 | ret = -errno; |
| 976 | } |
| 977 | error: |
| 978 | return ret; |
| 979 | } |
| 980 | |
| 981 | LTTNG_HIDDEN |
| 982 | bool lttng_directory_handle_get(struct lttng_directory_handle *handle) |
| 983 | { |
| 984 | return urcu_ref_get_unless_zero(&handle->ref); |
| 985 | } |
| 986 | |
| 987 | LTTNG_HIDDEN |
| 988 | void lttng_directory_handle_put(struct lttng_directory_handle *handle) |
| 989 | { |
| 990 | if (!handle) { |
| 991 | return; |
| 992 | } |
| 993 | assert(handle->ref.refcount); |
| 994 | urcu_ref_put(&handle->ref, lttng_directory_handle_release); |
| 995 | } |
| 996 | |
| 997 | LTTNG_HIDDEN |
| 998 | int lttng_directory_handle_create_subdirectory_as_user( |
| 999 | const struct lttng_directory_handle *handle, |
| 1000 | const char *subdirectory, |
| 1001 | mode_t mode, const struct lttng_credentials *creds) |
| 1002 | { |
| 1003 | int ret; |
| 1004 | |
| 1005 | if (!creds) { |
| 1006 | /* Run as current user. */ |
| 1007 | ret = create_directory_check_exists(handle, |
| 1008 | subdirectory, mode); |
| 1009 | } else { |
| 1010 | ret = _run_as_mkdir(handle, subdirectory, |
| 1011 | mode, creds->uid, creds->gid); |
| 1012 | } |
| 1013 | |
| 1014 | return ret; |
| 1015 | } |
| 1016 | |
| 1017 | LTTNG_HIDDEN |
| 1018 | int lttng_directory_handle_create_subdirectory_recursive_as_user( |
| 1019 | const struct lttng_directory_handle *handle, |
| 1020 | const char *subdirectory_path, |
| 1021 | mode_t mode, const struct lttng_credentials *creds) |
| 1022 | { |
| 1023 | int ret; |
| 1024 | |
| 1025 | if (!creds) { |
| 1026 | /* Run as current user. */ |
| 1027 | ret = create_directory_recursive(handle, |
| 1028 | subdirectory_path, mode); |
| 1029 | } else { |
| 1030 | ret = _run_as_mkdir_recursive(handle, subdirectory_path, |
| 1031 | mode, creds->uid, creds->gid); |
| 1032 | } |
| 1033 | |
| 1034 | return ret; |
| 1035 | } |
| 1036 | |
| 1037 | LTTNG_HIDDEN |
| 1038 | int lttng_directory_handle_create_subdirectory( |
| 1039 | const struct lttng_directory_handle *handle, |
| 1040 | const char *subdirectory, |
| 1041 | mode_t mode) |
| 1042 | { |
| 1043 | return lttng_directory_handle_create_subdirectory_as_user( |
| 1044 | handle, subdirectory, mode, NULL); |
| 1045 | } |
| 1046 | |
| 1047 | LTTNG_HIDDEN |
| 1048 | int lttng_directory_handle_create_subdirectory_recursive( |
| 1049 | const struct lttng_directory_handle *handle, |
| 1050 | const char *subdirectory_path, |
| 1051 | mode_t mode) |
| 1052 | { |
| 1053 | return lttng_directory_handle_create_subdirectory_recursive_as_user( |
| 1054 | handle, subdirectory_path, mode, NULL); |
| 1055 | } |
| 1056 | |
| 1057 | LTTNG_HIDDEN |
| 1058 | int lttng_directory_handle_open_file_as_user( |
| 1059 | const struct lttng_directory_handle *handle, |
| 1060 | const char *filename, |
| 1061 | int flags, mode_t mode, |
| 1062 | const struct lttng_credentials *creds) |
| 1063 | { |
| 1064 | int ret; |
| 1065 | |
| 1066 | if (!creds) { |
| 1067 | /* Run as current user. */ |
| 1068 | ret = lttng_directory_handle_open(handle, filename, flags, |
| 1069 | mode); |
| 1070 | } else { |
| 1071 | ret = _run_as_open(handle, filename, flags, mode, |
| 1072 | creds->uid, creds->gid); |
| 1073 | } |
| 1074 | return ret; |
| 1075 | } |
| 1076 | |
| 1077 | LTTNG_HIDDEN |
| 1078 | int lttng_directory_handle_open_file( |
| 1079 | const struct lttng_directory_handle *handle, |
| 1080 | const char *filename, |
| 1081 | int flags, mode_t mode) |
| 1082 | { |
| 1083 | return lttng_directory_handle_open_file_as_user(handle, filename, flags, |
| 1084 | mode, NULL); |
| 1085 | } |
| 1086 | |
| 1087 | LTTNG_HIDDEN |
| 1088 | int lttng_directory_handle_unlink_file_as_user( |
| 1089 | const struct lttng_directory_handle *handle, |
| 1090 | const char *filename, |
| 1091 | const struct lttng_credentials *creds) |
| 1092 | { |
| 1093 | int ret; |
| 1094 | |
| 1095 | if (!creds) { |
| 1096 | /* Run as current user. */ |
| 1097 | ret = lttng_directory_handle_unlink(handle, filename); |
| 1098 | } else { |
| 1099 | ret = _run_as_unlink(handle, filename, creds->uid, creds->gid); |
| 1100 | } |
| 1101 | return ret; |
| 1102 | } |
| 1103 | |
| 1104 | LTTNG_HIDDEN |
| 1105 | int lttng_directory_handle_unlink_file( |
| 1106 | const struct lttng_directory_handle *handle, |
| 1107 | const char *filename) |
| 1108 | { |
| 1109 | return lttng_directory_handle_unlink_file_as_user(handle, |
| 1110 | filename, NULL); |
| 1111 | } |
| 1112 | |
| 1113 | LTTNG_HIDDEN |
| 1114 | int lttng_directory_handle_rename( |
| 1115 | const struct lttng_directory_handle *old_handle, |
| 1116 | const char *old_name, |
| 1117 | const struct lttng_directory_handle *new_handle, |
| 1118 | const char *new_name) |
| 1119 | { |
| 1120 | return lttng_directory_handle_rename_as_user(old_handle, old_name, |
| 1121 | new_handle, new_name, NULL); |
| 1122 | } |
| 1123 | |
| 1124 | LTTNG_HIDDEN |
| 1125 | int lttng_directory_handle_rename_as_user( |
| 1126 | const struct lttng_directory_handle *old_handle, |
| 1127 | const char *old_name, |
| 1128 | const struct lttng_directory_handle *new_handle, |
| 1129 | const char *new_name, |
| 1130 | const struct lttng_credentials *creds) |
| 1131 | { |
| 1132 | int ret; |
| 1133 | |
| 1134 | if (!creds) { |
| 1135 | /* Run as current user. */ |
| 1136 | ret = _lttng_directory_handle_rename(old_handle, |
| 1137 | old_name, new_handle, new_name); |
| 1138 | } else { |
| 1139 | ret = _run_as_rename(old_handle, old_name, new_handle, |
| 1140 | new_name, creds->uid, creds->gid); |
| 1141 | } |
| 1142 | return ret; |
| 1143 | } |
| 1144 | |
| 1145 | LTTNG_HIDDEN |
| 1146 | int lttng_directory_handle_remove_subdirectory( |
| 1147 | const struct lttng_directory_handle *handle, |
| 1148 | const char *name) |
| 1149 | { |
| 1150 | return lttng_directory_handle_remove_subdirectory_as_user(handle, name, |
| 1151 | NULL); |
| 1152 | } |
| 1153 | |
| 1154 | LTTNG_HIDDEN |
| 1155 | int lttng_directory_handle_remove_subdirectory_as_user( |
| 1156 | const struct lttng_directory_handle *handle, |
| 1157 | const char *name, |
| 1158 | const struct lttng_credentials *creds) |
| 1159 | { |
| 1160 | int ret; |
| 1161 | |
| 1162 | if (!creds) { |
| 1163 | /* Run as current user. */ |
| 1164 | ret = lttng_directory_handle_rmdir(handle, name); |
| 1165 | } else { |
| 1166 | ret = _run_as_rmdir(handle, name, creds->uid, creds->gid); |
| 1167 | } |
| 1168 | return ret; |
| 1169 | } |
| 1170 | |
| 1171 | struct rmdir_frame { |
| 1172 | ssize_t parent_frame_idx; |
| 1173 | DIR *dir; |
| 1174 | bool empty; |
| 1175 | /* Size including '\0'. */ |
| 1176 | size_t path_size; |
| 1177 | }; |
| 1178 | |
| 1179 | static |
| 1180 | void rmdir_frame_fini(void *data) |
| 1181 | { |
| 1182 | int ret; |
| 1183 | struct rmdir_frame *frame = data; |
| 1184 | |
| 1185 | ret = closedir(frame->dir); |
| 1186 | if (ret == -1) { |
| 1187 | PERROR("Failed to close directory stream"); |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | static |
| 1192 | int remove_directory_recursive(const struct lttng_directory_handle *handle, |
| 1193 | const char *path, int flags) |
| 1194 | { |
| 1195 | int ret; |
| 1196 | struct lttng_dynamic_array frames; |
| 1197 | size_t current_frame_idx = 0; |
| 1198 | struct rmdir_frame initial_frame = { |
| 1199 | .parent_frame_idx = -1, |
| 1200 | .dir = lttng_directory_handle_opendir(handle, path), |
| 1201 | .empty = true, |
| 1202 | .path_size = strlen(path) + 1, |
| 1203 | }; |
| 1204 | struct lttng_dynamic_buffer current_path; |
| 1205 | const char separator = '/'; |
| 1206 | |
| 1207 | lttng_dynamic_buffer_init(¤t_path); |
| 1208 | lttng_dynamic_array_init(&frames, sizeof(struct rmdir_frame), |
| 1209 | rmdir_frame_fini); |
| 1210 | |
| 1211 | if (flags & ~(LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG | |
| 1212 | LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG)) { |
| 1213 | ERR("Unknown flags %d", flags); |
| 1214 | ret = -1; |
| 1215 | goto end; |
| 1216 | } |
| 1217 | |
| 1218 | if (!initial_frame.dir) { |
| 1219 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG && |
| 1220 | errno == ENOENT) { |
| 1221 | DBG("Cannot rmdir \"%s\": root does not exist", path); |
| 1222 | ret = 0; |
| 1223 | goto end; |
| 1224 | } else { |
| 1225 | PERROR("Failed to rmdir \"%s\"", path); |
| 1226 | ret = -1; |
| 1227 | goto end; |
| 1228 | } |
| 1229 | } |
| 1230 | |
| 1231 | ret = lttng_dynamic_array_add_element(&frames, &initial_frame); |
| 1232 | if (ret) { |
| 1233 | ERR("Failed to push context frame during recursive directory removal"); |
| 1234 | rmdir_frame_fini(&initial_frame); |
| 1235 | goto end; |
| 1236 | } |
| 1237 | |
| 1238 | ret = lttng_dynamic_buffer_append( |
| 1239 | ¤t_path, path, initial_frame.path_size); |
| 1240 | if (ret) { |
| 1241 | ERR("Failed to set initial path during recursive directory removal"); |
| 1242 | ret = -1; |
| 1243 | goto end; |
| 1244 | } |
| 1245 | |
| 1246 | while (lttng_dynamic_array_get_count(&frames) > 0) { |
| 1247 | struct dirent *entry; |
| 1248 | struct rmdir_frame *current_frame = |
| 1249 | lttng_dynamic_array_get_element( |
| 1250 | &frames, current_frame_idx); |
| 1251 | |
| 1252 | assert(current_frame->dir); |
| 1253 | ret = lttng_dynamic_buffer_set_size( |
| 1254 | ¤t_path, current_frame->path_size); |
| 1255 | assert(!ret); |
| 1256 | current_path.data[current_path.size - 1] = '\0'; |
| 1257 | |
| 1258 | while ((entry = readdir(current_frame->dir))) { |
| 1259 | struct stat st; |
| 1260 | |
| 1261 | if (!strcmp(entry->d_name, ".") || |
| 1262 | !strcmp(entry->d_name, "..")) { |
| 1263 | continue; |
| 1264 | } |
| 1265 | |
| 1266 | /* Set current_path to the entry's path. */ |
| 1267 | ret = lttng_dynamic_buffer_set_size( |
| 1268 | ¤t_path, current_path.size - 1); |
| 1269 | assert(!ret); |
| 1270 | ret = lttng_dynamic_buffer_append(¤t_path, |
| 1271 | &separator, sizeof(separator)); |
| 1272 | if (ret) { |
| 1273 | goto end; |
| 1274 | } |
| 1275 | ret = lttng_dynamic_buffer_append(¤t_path, |
| 1276 | entry->d_name, |
| 1277 | strlen(entry->d_name) + 1); |
| 1278 | if (ret) { |
| 1279 | goto end; |
| 1280 | } |
| 1281 | |
| 1282 | if (lttng_directory_handle_stat( |
| 1283 | handle, current_path.data, &st)) { |
| 1284 | if ((flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG) && |
| 1285 | errno == ENOENT) { |
| 1286 | break; |
| 1287 | } |
| 1288 | PERROR("Failed to stat \"%s\"", |
| 1289 | current_path.data); |
| 1290 | ret = -1; |
| 1291 | goto end; |
| 1292 | } |
| 1293 | |
| 1294 | if (!S_ISDIR(st.st_mode)) { |
| 1295 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG) { |
| 1296 | current_frame->empty = false; |
| 1297 | break; |
| 1298 | } else { |
| 1299 | /* Not empty, abort. */ |
| 1300 | DBG("Directory \"%s\" is not empty; refusing to remove directory", |
| 1301 | current_path.data); |
| 1302 | ret = -1; |
| 1303 | goto end; |
| 1304 | } |
| 1305 | } else { |
| 1306 | struct rmdir_frame new_frame = { |
| 1307 | .path_size = current_path.size, |
| 1308 | .dir = lttng_directory_handle_opendir( |
| 1309 | handle, |
| 1310 | current_path.data), |
| 1311 | .empty = true, |
| 1312 | .parent_frame_idx = current_frame_idx, |
| 1313 | }; |
| 1314 | |
| 1315 | if (!new_frame.dir) { |
| 1316 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG && |
| 1317 | errno == ENOENT) { |
| 1318 | DBG("Non-existing directory stream during recursive directory removal"); |
| 1319 | break; |
| 1320 | } else { |
| 1321 | PERROR("Failed to open directory stream during recursive directory removal"); |
| 1322 | ret = -1; |
| 1323 | goto end; |
| 1324 | } |
| 1325 | } |
| 1326 | ret = lttng_dynamic_array_add_element( |
| 1327 | &frames, &new_frame); |
| 1328 | if (ret) { |
| 1329 | ERR("Failed to push context frame during recursive directory removal"); |
| 1330 | rmdir_frame_fini(&new_frame); |
| 1331 | goto end; |
| 1332 | } |
| 1333 | current_frame_idx++; |
| 1334 | /* We break iteration on readdir. */ |
| 1335 | break; |
| 1336 | } |
| 1337 | } |
| 1338 | if (entry) { |
| 1339 | continue; |
| 1340 | } |
| 1341 | |
| 1342 | /* Pop rmdir frame. */ |
| 1343 | if (current_frame->empty) { |
| 1344 | ret = lttng_directory_handle_rmdir( |
| 1345 | handle, current_path.data); |
| 1346 | if (ret) { |
| 1347 | if ((flags & LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG) || |
| 1348 | errno != ENOENT) { |
| 1349 | PERROR("Failed to remove \"%s\" during recursive directory removal", |
| 1350 | current_path.data); |
| 1351 | goto end; |
| 1352 | } |
| 1353 | DBG("Non-existing directory stream during recursive directory removal"); |
| 1354 | } |
| 1355 | } else if (current_frame->parent_frame_idx >= 0) { |
| 1356 | struct rmdir_frame *parent_frame; |
| 1357 | |
| 1358 | parent_frame = lttng_dynamic_array_get_element(&frames, |
| 1359 | current_frame->parent_frame_idx); |
| 1360 | assert(parent_frame); |
| 1361 | parent_frame->empty = false; |
| 1362 | } |
| 1363 | ret = lttng_dynamic_array_remove_element( |
| 1364 | &frames, current_frame_idx); |
| 1365 | if (ret) { |
| 1366 | ERR("Failed to pop context frame during recursive directory removal"); |
| 1367 | goto end; |
| 1368 | } |
| 1369 | current_frame_idx--; |
| 1370 | } |
| 1371 | end: |
| 1372 | lttng_dynamic_array_reset(&frames); |
| 1373 | lttng_dynamic_buffer_reset(¤t_path); |
| 1374 | return ret; |
| 1375 | } |
| 1376 | |
| 1377 | LTTNG_HIDDEN |
| 1378 | int lttng_directory_handle_remove_subdirectory_recursive( |
| 1379 | const struct lttng_directory_handle *handle, |
| 1380 | const char *name, |
| 1381 | int flags) |
| 1382 | { |
| 1383 | return lttng_directory_handle_remove_subdirectory_recursive_as_user( |
| 1384 | handle, name, NULL, flags); |
| 1385 | } |
| 1386 | |
| 1387 | LTTNG_HIDDEN |
| 1388 | int lttng_directory_handle_remove_subdirectory_recursive_as_user( |
| 1389 | const struct lttng_directory_handle *handle, |
| 1390 | const char *name, |
| 1391 | const struct lttng_credentials *creds, |
| 1392 | int flags) |
| 1393 | { |
| 1394 | int ret; |
| 1395 | |
| 1396 | if (!creds) { |
| 1397 | /* Run as current user. */ |
| 1398 | ret = remove_directory_recursive(handle, name, flags); |
| 1399 | } else { |
| 1400 | ret = _run_as_rmdir_recursive(handle, name, creds->uid, |
| 1401 | creds->gid, flags); |
| 1402 | } |
| 1403 | return ret; |
| 1404 | } |