| 1 | /* |
| 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <assert.h> |
| 9 | #include <common/compat/string.h> |
| 10 | #include <common/error.h> |
| 11 | #include <common/macros.h> |
| 12 | #include <common/payload.h> |
| 13 | #include <common/payload-view.h> |
| 14 | #include <fcntl.h> |
| 15 | #include <lttng/constant.h> |
| 16 | #include <lttng/userspace-probe-internal.h> |
| 17 | #include <sys/stat.h> |
| 18 | #include <sys/types.h> |
| 19 | #include <sys/unistd.h> |
| 20 | |
| 21 | enum lttng_userspace_probe_location_lookup_method_type |
| 22 | lttng_userspace_probe_location_lookup_method_get_type( |
| 23 | const struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 24 | { |
| 25 | return lookup_method ? lookup_method->type : |
| 26 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_UNKNOWN; |
| 27 | } |
| 28 | |
| 29 | void lttng_userspace_probe_location_lookup_method_destroy( |
| 30 | struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 31 | { |
| 32 | if (!lookup_method){ |
| 33 | return; |
| 34 | } |
| 35 | |
| 36 | free(lookup_method); |
| 37 | } |
| 38 | |
| 39 | struct lttng_userspace_probe_location_lookup_method * |
| 40 | lttng_userspace_probe_location_lookup_method_function_elf_create(void) |
| 41 | { |
| 42 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 43 | struct lttng_userspace_probe_location_lookup_method_elf *elf_method; |
| 44 | |
| 45 | elf_method = zmalloc(sizeof(*elf_method)); |
| 46 | if (!elf_method) { |
| 47 | PERROR("zmalloc"); |
| 48 | goto end; |
| 49 | } |
| 50 | |
| 51 | ret = &elf_method->parent; |
| 52 | ret->type = LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF; |
| 53 | end: |
| 54 | return ret; |
| 55 | } |
| 56 | |
| 57 | struct lttng_userspace_probe_location_lookup_method * |
| 58 | lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create(void) |
| 59 | { |
| 60 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 61 | struct lttng_userspace_probe_location_lookup_method_sdt *sdt_method; |
| 62 | |
| 63 | sdt_method = zmalloc(sizeof(*sdt_method)); |
| 64 | if (!sdt_method) { |
| 65 | PERROR("zmalloc"); |
| 66 | goto end; |
| 67 | } |
| 68 | |
| 69 | ret = &sdt_method->parent; |
| 70 | ret->type = LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT; |
| 71 | end: |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | enum lttng_userspace_probe_location_type lttng_userspace_probe_location_get_type( |
| 76 | const struct lttng_userspace_probe_location *location) |
| 77 | { |
| 78 | return location ? location->type : |
| 79 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_UNKNOWN; |
| 80 | } |
| 81 | |
| 82 | static |
| 83 | void lttng_userspace_probe_location_function_destroy( |
| 84 | struct lttng_userspace_probe_location *location) |
| 85 | { |
| 86 | struct lttng_userspace_probe_location_function *location_function = NULL; |
| 87 | |
| 88 | assert(location); |
| 89 | |
| 90 | location_function = container_of(location, |
| 91 | struct lttng_userspace_probe_location_function, parent); |
| 92 | |
| 93 | assert(location_function); |
| 94 | |
| 95 | free(location_function->function_name); |
| 96 | free(location_function->binary_path); |
| 97 | if (location_function->binary_fd >= 0) { |
| 98 | if (close(location_function->binary_fd)) { |
| 99 | PERROR("close"); |
| 100 | } |
| 101 | } |
| 102 | free(location); |
| 103 | } |
| 104 | |
| 105 | static |
| 106 | void lttng_userspace_probe_location_tracepoint_destroy( |
| 107 | struct lttng_userspace_probe_location *location) |
| 108 | { |
| 109 | struct lttng_userspace_probe_location_tracepoint *location_tracepoint = NULL; |
| 110 | |
| 111 | assert(location); |
| 112 | |
| 113 | location_tracepoint = container_of(location, |
| 114 | struct lttng_userspace_probe_location_tracepoint, |
| 115 | parent); |
| 116 | |
| 117 | assert(location_tracepoint); |
| 118 | |
| 119 | free(location_tracepoint->probe_name); |
| 120 | free(location_tracepoint->provider_name); |
| 121 | free(location_tracepoint->binary_path); |
| 122 | if (location_tracepoint->binary_fd >= 0) { |
| 123 | if (close(location_tracepoint->binary_fd)) { |
| 124 | PERROR("close"); |
| 125 | } |
| 126 | } |
| 127 | free(location); |
| 128 | } |
| 129 | |
| 130 | void lttng_userspace_probe_location_destroy( |
| 131 | struct lttng_userspace_probe_location *location) |
| 132 | { |
| 133 | if (!location) { |
| 134 | return; |
| 135 | } |
| 136 | |
| 137 | lttng_userspace_probe_location_lookup_method_destroy( |
| 138 | location->lookup_method); |
| 139 | |
| 140 | switch (location->type) { |
| 141 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 142 | lttng_userspace_probe_location_function_destroy(location); |
| 143 | break; |
| 144 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT: |
| 145 | lttng_userspace_probe_location_tracepoint_destroy(location); |
| 146 | break; |
| 147 | default: |
| 148 | abort(); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /* Compare two file descriptors based on their inode and device numbers. */ |
| 153 | static bool fd_is_equal(int a, int b) |
| 154 | { |
| 155 | int ret; |
| 156 | bool is_equal = false; |
| 157 | struct stat a_stat, b_stat; |
| 158 | |
| 159 | if (a < 0 && b >= 0) { |
| 160 | goto end; |
| 161 | } |
| 162 | |
| 163 | if (b < 0 && a >= 0) { |
| 164 | goto end; |
| 165 | } |
| 166 | |
| 167 | if (a < 0 && b < 0) { |
| 168 | if (a == -1 && b == -1) { |
| 169 | is_equal = true; |
| 170 | goto end; |
| 171 | } |
| 172 | |
| 173 | /* Invalid state, abort. */ |
| 174 | abort(); |
| 175 | } |
| 176 | |
| 177 | /* Both are valid file descriptors. */ |
| 178 | ret = fstat(a, &a_stat); |
| 179 | if (ret) { |
| 180 | PERROR("Failed to fstat userspace probe location binary fd %d", |
| 181 | a); |
| 182 | goto end; |
| 183 | } |
| 184 | |
| 185 | ret = fstat(b, &b_stat); |
| 186 | if (ret) { |
| 187 | PERROR("Failed to fstat userspace probe location binary fd %d", |
| 188 | b); |
| 189 | goto end; |
| 190 | } |
| 191 | |
| 192 | is_equal = (a_stat.st_ino == b_stat.st_ino) && |
| 193 | (a_stat.st_dev == b_stat.st_dev); |
| 194 | |
| 195 | end: |
| 196 | return is_equal; |
| 197 | } |
| 198 | |
| 199 | static bool lttng_userspace_probe_location_function_is_equal( |
| 200 | const struct lttng_userspace_probe_location *_a, |
| 201 | const struct lttng_userspace_probe_location *_b) |
| 202 | { |
| 203 | bool is_equal = false; |
| 204 | struct lttng_userspace_probe_location_function *a, *b; |
| 205 | |
| 206 | a = container_of(_a, struct lttng_userspace_probe_location_function, |
| 207 | parent); |
| 208 | b = container_of(_b, struct lttng_userspace_probe_location_function, |
| 209 | parent); |
| 210 | |
| 211 | if (a->instrumentation_type != b->instrumentation_type) { |
| 212 | goto end; |
| 213 | } |
| 214 | |
| 215 | assert(a->function_name); |
| 216 | assert(b->function_name); |
| 217 | if (strcmp(a->function_name, b->function_name)) { |
| 218 | goto end; |
| 219 | } |
| 220 | |
| 221 | assert(a->binary_path); |
| 222 | assert(b->binary_path); |
| 223 | if (strcmp(a->binary_path, b->binary_path)) { |
| 224 | goto end; |
| 225 | } |
| 226 | |
| 227 | is_equal = fd_is_equal(a->binary_fd, b->binary_fd); |
| 228 | end: |
| 229 | return is_equal; |
| 230 | } |
| 231 | |
| 232 | static struct lttng_userspace_probe_location * |
| 233 | lttng_userspace_probe_location_function_create_no_check(const char *binary_path, |
| 234 | const char *function_name, |
| 235 | struct lttng_userspace_probe_location_lookup_method *lookup_method, |
| 236 | bool open_binary) |
| 237 | { |
| 238 | int binary_fd = -1; |
| 239 | char *function_name_copy = NULL, *binary_path_copy = NULL; |
| 240 | struct lttng_userspace_probe_location *ret = NULL; |
| 241 | struct lttng_userspace_probe_location_function *location; |
| 242 | |
| 243 | if (open_binary) { |
| 244 | binary_fd = open(binary_path, O_RDONLY); |
| 245 | if (binary_fd < 0) { |
| 246 | PERROR("Error opening the binary"); |
| 247 | goto error; |
| 248 | } |
| 249 | } else { |
| 250 | binary_fd = -1; |
| 251 | } |
| 252 | |
| 253 | function_name_copy = lttng_strndup(function_name, LTTNG_SYMBOL_NAME_LEN); |
| 254 | if (!function_name_copy) { |
| 255 | PERROR("Error duplicating the function name"); |
| 256 | goto error; |
| 257 | } |
| 258 | |
| 259 | binary_path_copy = lttng_strndup(binary_path, LTTNG_PATH_MAX); |
| 260 | if (!binary_path_copy) { |
| 261 | PERROR("Error duplicating the function name"); |
| 262 | goto error; |
| 263 | } |
| 264 | |
| 265 | location = zmalloc(sizeof(*location)); |
| 266 | if (!location) { |
| 267 | PERROR("Error allocating userspace probe location"); |
| 268 | goto error; |
| 269 | } |
| 270 | |
| 271 | location->function_name = function_name_copy; |
| 272 | location->binary_path = binary_path_copy; |
| 273 | location->binary_fd = binary_fd; |
| 274 | location->instrumentation_type = |
| 275 | LTTNG_USERSPACE_PROBE_LOCATION_FUNCTION_INSTRUMENTATION_TYPE_ENTRY; |
| 276 | |
| 277 | ret = &location->parent; |
| 278 | ret->lookup_method = lookup_method; |
| 279 | ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION; |
| 280 | ret->equal = lttng_userspace_probe_location_function_is_equal; |
| 281 | goto end; |
| 282 | |
| 283 | error: |
| 284 | free(function_name_copy); |
| 285 | free(binary_path_copy); |
| 286 | if (binary_fd >= 0) { |
| 287 | if (close(binary_fd)) { |
| 288 | PERROR("Error closing binary fd in error path"); |
| 289 | } |
| 290 | } |
| 291 | end: |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | static bool lttng_userspace_probe_location_tracepoint_is_equal( |
| 296 | const struct lttng_userspace_probe_location *_a, |
| 297 | const struct lttng_userspace_probe_location *_b) |
| 298 | { |
| 299 | bool is_equal = false; |
| 300 | struct lttng_userspace_probe_location_tracepoint *a, *b; |
| 301 | |
| 302 | a = container_of(_a, struct lttng_userspace_probe_location_tracepoint, |
| 303 | parent); |
| 304 | b = container_of(_b, struct lttng_userspace_probe_location_tracepoint, |
| 305 | parent); |
| 306 | |
| 307 | assert(a->probe_name); |
| 308 | assert(b->probe_name); |
| 309 | if (strcmp(a->probe_name, b->probe_name)) { |
| 310 | goto end; |
| 311 | } |
| 312 | |
| 313 | assert(a->provider_name); |
| 314 | assert(b->provider_name); |
| 315 | if (strcmp(a->provider_name, b->provider_name)) { |
| 316 | goto end; |
| 317 | } |
| 318 | |
| 319 | assert(a->binary_path); |
| 320 | assert(b->binary_path); |
| 321 | if (strcmp(a->binary_path, b->binary_path)) { |
| 322 | goto end; |
| 323 | } |
| 324 | |
| 325 | is_equal = fd_is_equal(a->binary_fd, b->binary_fd); |
| 326 | |
| 327 | end: |
| 328 | return is_equal; |
| 329 | } |
| 330 | |
| 331 | static struct lttng_userspace_probe_location * |
| 332 | lttng_userspace_probe_location_tracepoint_create_no_check(const char *binary_path, |
| 333 | const char *provider_name, const char *probe_name, |
| 334 | struct lttng_userspace_probe_location_lookup_method *lookup_method, |
| 335 | bool open_binary) |
| 336 | { |
| 337 | int binary_fd = -1; |
| 338 | char *probe_name_copy = NULL; |
| 339 | char *provider_name_copy = NULL; |
| 340 | char *binary_path_copy = NULL; |
| 341 | struct lttng_userspace_probe_location *ret = NULL; |
| 342 | struct lttng_userspace_probe_location_tracepoint *location; |
| 343 | |
| 344 | if (open_binary) { |
| 345 | binary_fd = open(binary_path, O_RDONLY); |
| 346 | if (binary_fd < 0) { |
| 347 | PERROR("open"); |
| 348 | goto error; |
| 349 | } |
| 350 | } else { |
| 351 | binary_fd = -1; |
| 352 | } |
| 353 | |
| 354 | probe_name_copy = lttng_strndup(probe_name, LTTNG_SYMBOL_NAME_LEN); |
| 355 | if (!probe_name_copy) { |
| 356 | PERROR("lttng_strndup"); |
| 357 | goto error; |
| 358 | } |
| 359 | |
| 360 | provider_name_copy = lttng_strndup(provider_name, LTTNG_SYMBOL_NAME_LEN); |
| 361 | if (!provider_name_copy) { |
| 362 | PERROR("lttng_strndup"); |
| 363 | goto error; |
| 364 | } |
| 365 | |
| 366 | binary_path_copy = lttng_strndup(binary_path, LTTNG_PATH_MAX); |
| 367 | if (!binary_path_copy) { |
| 368 | PERROR("lttng_strndup"); |
| 369 | goto error; |
| 370 | } |
| 371 | |
| 372 | location = zmalloc(sizeof(*location)); |
| 373 | if (!location) { |
| 374 | PERROR("zmalloc"); |
| 375 | goto error; |
| 376 | } |
| 377 | |
| 378 | location->probe_name = probe_name_copy; |
| 379 | location->provider_name = provider_name_copy; |
| 380 | location->binary_path = binary_path_copy; |
| 381 | location->binary_fd = binary_fd; |
| 382 | |
| 383 | ret = &location->parent; |
| 384 | ret->lookup_method = lookup_method; |
| 385 | ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT; |
| 386 | ret->equal = lttng_userspace_probe_location_tracepoint_is_equal; |
| 387 | goto end; |
| 388 | |
| 389 | error: |
| 390 | free(probe_name_copy); |
| 391 | free(provider_name_copy); |
| 392 | free(binary_path_copy); |
| 393 | if (binary_fd >= 0) { |
| 394 | if (close(binary_fd)) { |
| 395 | PERROR("Error closing binary fd in error path"); |
| 396 | } |
| 397 | } |
| 398 | end: |
| 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | struct lttng_userspace_probe_location * |
| 403 | lttng_userspace_probe_location_function_create(const char *binary_path, |
| 404 | const char *function_name, |
| 405 | struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 406 | { |
| 407 | struct lttng_userspace_probe_location *ret = NULL; |
| 408 | |
| 409 | if (!binary_path || !function_name) { |
| 410 | ERR("Invalid argument(s)"); |
| 411 | goto end; |
| 412 | } |
| 413 | |
| 414 | switch (lttng_userspace_probe_location_lookup_method_get_type( |
| 415 | lookup_method)) { |
| 416 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT: |
| 417 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 418 | break; |
| 419 | default: |
| 420 | /* Invalid probe location lookup method. */ |
| 421 | goto end; |
| 422 | } |
| 423 | |
| 424 | ret = lttng_userspace_probe_location_function_create_no_check( |
| 425 | binary_path, function_name, lookup_method, true); |
| 426 | end: |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | struct lttng_userspace_probe_location * |
| 431 | lttng_userspace_probe_location_tracepoint_create(const char *binary_path, |
| 432 | const char *provider_name, const char *probe_name, |
| 433 | struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 434 | { |
| 435 | struct lttng_userspace_probe_location *ret = NULL; |
| 436 | |
| 437 | if (!binary_path || !probe_name || !provider_name) { |
| 438 | ERR("Invalid argument(s)"); |
| 439 | goto end; |
| 440 | } |
| 441 | |
| 442 | switch (lttng_userspace_probe_location_lookup_method_get_type( |
| 443 | lookup_method)) { |
| 444 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 445 | break; |
| 446 | default: |
| 447 | /* Invalid probe location lookup method. */ |
| 448 | goto end; |
| 449 | } |
| 450 | |
| 451 | ret = lttng_userspace_probe_location_tracepoint_create_no_check( |
| 452 | binary_path, provider_name, probe_name, lookup_method, true); |
| 453 | end: |
| 454 | return ret; |
| 455 | } |
| 456 | |
| 457 | static struct lttng_userspace_probe_location_lookup_method * |
| 458 | lttng_userspace_probe_location_lookup_method_function_elf_copy( |
| 459 | const struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 460 | { |
| 461 | struct lttng_userspace_probe_location_lookup_method *parent = NULL; |
| 462 | struct lttng_userspace_probe_location_lookup_method_elf *elf_method; |
| 463 | |
| 464 | assert(lookup_method); |
| 465 | assert(lookup_method->type == |
| 466 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); |
| 467 | |
| 468 | elf_method = zmalloc(sizeof(*elf_method)); |
| 469 | if (!elf_method) { |
| 470 | PERROR("Error allocating ELF userspace probe lookup method"); |
| 471 | goto error; |
| 472 | } |
| 473 | |
| 474 | elf_method->parent.type = lookup_method->type; |
| 475 | parent = &elf_method->parent; |
| 476 | |
| 477 | goto end; |
| 478 | error: |
| 479 | parent = NULL; |
| 480 | end: |
| 481 | return parent; |
| 482 | } |
| 483 | |
| 484 | static struct lttng_userspace_probe_location_lookup_method * |
| 485 | lttng_userspace_probe_location_lookup_method_tracepoint_sdt_copy( |
| 486 | struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 487 | { |
| 488 | struct lttng_userspace_probe_location_lookup_method *parent = NULL; |
| 489 | struct lttng_userspace_probe_location_lookup_method_sdt *sdt_method; |
| 490 | |
| 491 | assert(lookup_method); |
| 492 | assert(lookup_method->type == |
| 493 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); |
| 494 | |
| 495 | sdt_method = zmalloc(sizeof(*sdt_method)); |
| 496 | if (!sdt_method) { |
| 497 | PERROR("zmalloc"); |
| 498 | goto error; |
| 499 | } |
| 500 | |
| 501 | sdt_method->parent.type = lookup_method->type; |
| 502 | parent = &sdt_method->parent; |
| 503 | |
| 504 | goto end; |
| 505 | |
| 506 | error: |
| 507 | parent = NULL; |
| 508 | end: |
| 509 | return parent; |
| 510 | } |
| 511 | |
| 512 | static struct lttng_userspace_probe_location * |
| 513 | lttng_userspace_probe_location_function_copy( |
| 514 | const struct lttng_userspace_probe_location *location) |
| 515 | { |
| 516 | enum lttng_userspace_probe_location_lookup_method_type lookup_type; |
| 517 | struct lttng_userspace_probe_location *new_location = NULL; |
| 518 | struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
| 519 | const char *binary_path = NULL; |
| 520 | const char *function_name = NULL; |
| 521 | int fd, new_fd; |
| 522 | |
| 523 | assert(location); |
| 524 | assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
| 525 | |
| 526 | /* Get probe location fields */ |
| 527 | binary_path = lttng_userspace_probe_location_function_get_binary_path(location); |
| 528 | if (!binary_path) { |
| 529 | ERR("Userspace probe binary path is NULL"); |
| 530 | goto error; |
| 531 | } |
| 532 | |
| 533 | function_name = lttng_userspace_probe_location_function_get_function_name(location); |
| 534 | if (!function_name) { |
| 535 | ERR("Userspace probe function name is NULL"); |
| 536 | goto error; |
| 537 | } |
| 538 | |
| 539 | /* Duplicate the binary fd */ |
| 540 | fd = lttng_userspace_probe_location_function_get_binary_fd(location); |
| 541 | if (fd == -1) { |
| 542 | ERR("Error getting file descriptor to binary"); |
| 543 | goto error; |
| 544 | } |
| 545 | |
| 546 | new_fd = dup(fd); |
| 547 | if (new_fd == -1) { |
| 548 | PERROR("Error duplicating file descriptor to binary"); |
| 549 | goto error; |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Duplicate probe location method fields |
| 554 | */ |
| 555 | lookup_type = lttng_userspace_probe_location_lookup_method_get_type( |
| 556 | location->lookup_method); |
| 557 | switch (lookup_type) { |
| 558 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 559 | lookup_method = |
| 560 | lttng_userspace_probe_location_lookup_method_function_elf_copy( |
| 561 | location->lookup_method); |
| 562 | if (!lookup_method) { |
| 563 | goto close_fd; |
| 564 | } |
| 565 | break; |
| 566 | default: |
| 567 | /* Invalid probe location lookup method. */ |
| 568 | goto close_fd; |
| 569 | } |
| 570 | |
| 571 | /* Create the probe_location */ |
| 572 | new_location = lttng_userspace_probe_location_function_create_no_check( |
| 573 | binary_path, function_name, lookup_method, false); |
| 574 | if (!new_location) { |
| 575 | goto destroy_lookup_method; |
| 576 | } |
| 577 | |
| 578 | /* Set the duplicated fd to the new probe_location */ |
| 579 | if (lttng_userspace_probe_location_function_set_binary_fd(new_location, new_fd) < 0) { |
| 580 | goto destroy_probe_location; |
| 581 | } |
| 582 | |
| 583 | goto end; |
| 584 | |
| 585 | destroy_probe_location: |
| 586 | lttng_userspace_probe_location_destroy(new_location); |
| 587 | destroy_lookup_method: |
| 588 | lttng_userspace_probe_location_lookup_method_destroy(lookup_method); |
| 589 | close_fd: |
| 590 | if (close(new_fd) < 0) { |
| 591 | PERROR("Error closing duplicated file descriptor in error path"); |
| 592 | } |
| 593 | error: |
| 594 | new_location = NULL; |
| 595 | end: |
| 596 | return new_location; |
| 597 | } |
| 598 | |
| 599 | static struct lttng_userspace_probe_location * |
| 600 | lttng_userspace_probe_location_tracepoint_copy( |
| 601 | const struct lttng_userspace_probe_location *location) |
| 602 | { |
| 603 | enum lttng_userspace_probe_location_lookup_method_type lookup_type; |
| 604 | struct lttng_userspace_probe_location *new_location = NULL; |
| 605 | struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
| 606 | const char *binary_path = NULL; |
| 607 | const char *probe_name = NULL; |
| 608 | const char *provider_name = NULL; |
| 609 | int fd, new_fd; |
| 610 | |
| 611 | assert(location); |
| 612 | assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
| 613 | |
| 614 | /* Get probe location fields */ |
| 615 | binary_path = lttng_userspace_probe_location_tracepoint_get_binary_path(location); |
| 616 | if (!binary_path) { |
| 617 | ERR("Userspace probe binary path is NULL"); |
| 618 | goto error; |
| 619 | } |
| 620 | |
| 621 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name(location); |
| 622 | if (!probe_name) { |
| 623 | ERR("Userspace probe probe name is NULL"); |
| 624 | goto error; |
| 625 | } |
| 626 | |
| 627 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name(location); |
| 628 | if (!provider_name) { |
| 629 | ERR("Userspace probe provider name is NULL"); |
| 630 | goto error; |
| 631 | } |
| 632 | |
| 633 | /* Duplicate the binary fd */ |
| 634 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(location); |
| 635 | if (fd == -1) { |
| 636 | ERR("Error getting file descriptor to binary"); |
| 637 | goto error; |
| 638 | } |
| 639 | |
| 640 | new_fd = dup(fd); |
| 641 | if (new_fd == -1) { |
| 642 | PERROR("Error duplicating file descriptor to binary"); |
| 643 | goto error; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * Duplicate probe location method fields |
| 648 | */ |
| 649 | lookup_type = lttng_userspace_probe_location_lookup_method_get_type( |
| 650 | location->lookup_method); |
| 651 | switch (lookup_type) { |
| 652 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 653 | lookup_method = |
| 654 | lttng_userspace_probe_location_lookup_method_tracepoint_sdt_copy( |
| 655 | location->lookup_method); |
| 656 | if (!lookup_method) { |
| 657 | goto close_fd; |
| 658 | } |
| 659 | break; |
| 660 | default: |
| 661 | /* Invalid probe location lookup method. */ |
| 662 | goto close_fd; |
| 663 | } |
| 664 | |
| 665 | /* Create the probe_location */ |
| 666 | new_location = lttng_userspace_probe_location_tracepoint_create_no_check( |
| 667 | binary_path, provider_name, probe_name, lookup_method, false); |
| 668 | if (!new_location) { |
| 669 | goto destroy_lookup_method; |
| 670 | } |
| 671 | |
| 672 | /* Set the duplicated fd to the new probe_location */ |
| 673 | if (lttng_userspace_probe_location_tracepoint_set_binary_fd(new_location, new_fd) < 0) { |
| 674 | goto destroy_probe_location; |
| 675 | } |
| 676 | |
| 677 | goto end; |
| 678 | |
| 679 | destroy_probe_location: |
| 680 | lttng_userspace_probe_location_destroy(new_location); |
| 681 | destroy_lookup_method: |
| 682 | lttng_userspace_probe_location_lookup_method_destroy(lookup_method); |
| 683 | close_fd: |
| 684 | if (close(new_fd) < 0) { |
| 685 | PERROR("Error closing duplicated file descriptor in error path"); |
| 686 | } |
| 687 | error: |
| 688 | new_location = NULL; |
| 689 | end: |
| 690 | return new_location; |
| 691 | } |
| 692 | |
| 693 | const char *lttng_userspace_probe_location_function_get_binary_path( |
| 694 | const struct lttng_userspace_probe_location *location) |
| 695 | { |
| 696 | const char *ret = NULL; |
| 697 | struct lttng_userspace_probe_location_function *function_location; |
| 698 | |
| 699 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 700 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 701 | ERR("Invalid argument(s)"); |
| 702 | goto end; |
| 703 | } |
| 704 | |
| 705 | function_location = container_of(location, |
| 706 | struct lttng_userspace_probe_location_function, |
| 707 | parent); |
| 708 | ret = function_location->binary_path; |
| 709 | end: |
| 710 | return ret; |
| 711 | } |
| 712 | |
| 713 | const char *lttng_userspace_probe_location_tracepoint_get_binary_path( |
| 714 | const struct lttng_userspace_probe_location *location) |
| 715 | { |
| 716 | const char *ret = NULL; |
| 717 | struct lttng_userspace_probe_location_tracepoint *tracepoint_location; |
| 718 | |
| 719 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 720 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT) { |
| 721 | ERR("Invalid argument(s)"); |
| 722 | goto end; |
| 723 | } |
| 724 | |
| 725 | tracepoint_location = container_of(location, |
| 726 | struct lttng_userspace_probe_location_tracepoint, |
| 727 | parent); |
| 728 | ret = tracepoint_location->binary_path; |
| 729 | end: |
| 730 | return ret; |
| 731 | } |
| 732 | |
| 733 | const char *lttng_userspace_probe_location_function_get_function_name( |
| 734 | const struct lttng_userspace_probe_location *location) |
| 735 | { |
| 736 | const char *ret = NULL; |
| 737 | struct lttng_userspace_probe_location_function *function_location; |
| 738 | |
| 739 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 740 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 741 | ERR("Invalid argument(s)"); |
| 742 | goto end; |
| 743 | } |
| 744 | |
| 745 | function_location = container_of(location, |
| 746 | struct lttng_userspace_probe_location_function, parent); |
| 747 | ret = function_location->function_name; |
| 748 | end: |
| 749 | return ret; |
| 750 | } |
| 751 | |
| 752 | const char *lttng_userspace_probe_location_tracepoint_get_probe_name( |
| 753 | const struct lttng_userspace_probe_location *location) |
| 754 | { |
| 755 | const char *ret = NULL; |
| 756 | struct lttng_userspace_probe_location_tracepoint *tracepoint_location; |
| 757 | |
| 758 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 759 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT) { |
| 760 | ERR("Invalid argument(s)"); |
| 761 | goto end; |
| 762 | } |
| 763 | |
| 764 | tracepoint_location = container_of(location, |
| 765 | struct lttng_userspace_probe_location_tracepoint, parent); |
| 766 | ret = tracepoint_location->probe_name; |
| 767 | end: |
| 768 | return ret; |
| 769 | } |
| 770 | |
| 771 | const char *lttng_userspace_probe_location_tracepoint_get_provider_name( |
| 772 | const struct lttng_userspace_probe_location *location) |
| 773 | { |
| 774 | const char *ret = NULL; |
| 775 | struct lttng_userspace_probe_location_tracepoint *tracepoint_location; |
| 776 | |
| 777 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 778 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT) { |
| 779 | ERR("Invalid argument(s)"); |
| 780 | goto end; |
| 781 | } |
| 782 | |
| 783 | tracepoint_location = container_of(location, |
| 784 | struct lttng_userspace_probe_location_tracepoint, parent); |
| 785 | ret = tracepoint_location->provider_name; |
| 786 | end: |
| 787 | return ret; |
| 788 | } |
| 789 | |
| 790 | int lttng_userspace_probe_location_function_get_binary_fd( |
| 791 | const struct lttng_userspace_probe_location *location) |
| 792 | { |
| 793 | int ret = -1; |
| 794 | struct lttng_userspace_probe_location_function *function_location; |
| 795 | |
| 796 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 797 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 798 | ERR("Invalid argument(s)"); |
| 799 | goto end; |
| 800 | } |
| 801 | |
| 802 | function_location = container_of(location, |
| 803 | struct lttng_userspace_probe_location_function, parent); |
| 804 | ret = function_location->binary_fd; |
| 805 | end: |
| 806 | return ret; |
| 807 | } |
| 808 | |
| 809 | enum lttng_userspace_probe_location_function_instrumentation_type |
| 810 | lttng_userspace_probe_location_function_get_instrumentation_type( |
| 811 | const struct lttng_userspace_probe_location *location) |
| 812 | { |
| 813 | enum lttng_userspace_probe_location_function_instrumentation_type type; |
| 814 | struct lttng_userspace_probe_location_function *function_location; |
| 815 | |
| 816 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 817 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 818 | ERR("Invalid argument(s)"); |
| 819 | type = LTTNG_USERSPACE_PROBE_LOCATION_FUNCTION_INSTRUMENTATION_TYPE_UNKNOWN; |
| 820 | goto end; |
| 821 | } |
| 822 | |
| 823 | function_location = container_of(location, |
| 824 | struct lttng_userspace_probe_location_function, parent); |
| 825 | type = function_location->instrumentation_type; |
| 826 | end: |
| 827 | return type; |
| 828 | } |
| 829 | |
| 830 | enum lttng_userspace_probe_location_status |
| 831 | lttng_userspace_probe_location_function_set_instrumentation_type( |
| 832 | const struct lttng_userspace_probe_location *location, |
| 833 | enum lttng_userspace_probe_location_function_instrumentation_type instrumentation_type) |
| 834 | { |
| 835 | enum lttng_userspace_probe_location_status status = |
| 836 | LTTNG_USERSPACE_PROBE_LOCATION_STATUS_OK; |
| 837 | struct lttng_userspace_probe_location_function *function_location; |
| 838 | |
| 839 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 840 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION || |
| 841 | instrumentation_type != |
| 842 | LTTNG_USERSPACE_PROBE_LOCATION_FUNCTION_INSTRUMENTATION_TYPE_ENTRY) { |
| 843 | ERR("Invalid argument(s)"); |
| 844 | status = LTTNG_USERSPACE_PROBE_LOCATION_STATUS_INVALID; |
| 845 | goto end; |
| 846 | } |
| 847 | |
| 848 | function_location = container_of(location, |
| 849 | struct lttng_userspace_probe_location_function, parent); |
| 850 | function_location->instrumentation_type = instrumentation_type; |
| 851 | end: |
| 852 | return status; |
| 853 | } |
| 854 | |
| 855 | int lttng_userspace_probe_location_tracepoint_get_binary_fd( |
| 856 | const struct lttng_userspace_probe_location *location) |
| 857 | { |
| 858 | int ret = -1; |
| 859 | struct lttng_userspace_probe_location_tracepoint *tracepoint_location; |
| 860 | |
| 861 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 862 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT) { |
| 863 | ERR("Invalid argument(s)"); |
| 864 | goto end; |
| 865 | } |
| 866 | |
| 867 | tracepoint_location = container_of(location, |
| 868 | struct lttng_userspace_probe_location_tracepoint, parent); |
| 869 | ret = tracepoint_location->binary_fd; |
| 870 | end: |
| 871 | return ret; |
| 872 | } |
| 873 | |
| 874 | static struct lttng_userspace_probe_location_lookup_method * |
| 875 | lttng_userspace_probe_location_function_get_lookup_method( |
| 876 | const struct lttng_userspace_probe_location *location) |
| 877 | { |
| 878 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 879 | |
| 880 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 881 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 882 | ERR("Invalid argument(s)"); |
| 883 | goto end; |
| 884 | } |
| 885 | |
| 886 | ret = location->lookup_method; |
| 887 | end: |
| 888 | return ret; |
| 889 | } |
| 890 | |
| 891 | static struct lttng_userspace_probe_location_lookup_method * |
| 892 | lttng_userspace_probe_location_tracepoint_get_lookup_method( |
| 893 | const struct lttng_userspace_probe_location *location) |
| 894 | { |
| 895 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 896 | |
| 897 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 898 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT) { |
| 899 | ERR("Invalid argument(s)"); |
| 900 | goto end; |
| 901 | } |
| 902 | |
| 903 | ret = location->lookup_method; |
| 904 | end: |
| 905 | return ret; |
| 906 | } |
| 907 | |
| 908 | const struct lttng_userspace_probe_location_lookup_method * |
| 909 | lttng_userspace_probe_location_get_lookup_method( |
| 910 | const struct lttng_userspace_probe_location *location) |
| 911 | { |
| 912 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 913 | |
| 914 | assert(location); |
| 915 | switch (location->type) { |
| 916 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 917 | ret = lttng_userspace_probe_location_function_get_lookup_method( |
| 918 | location); |
| 919 | break; |
| 920 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT: |
| 921 | ret = lttng_userspace_probe_location_tracepoint_get_lookup_method( |
| 922 | location); |
| 923 | break; |
| 924 | default: |
| 925 | ERR("Unknowned lookup method."); |
| 926 | break; |
| 927 | } |
| 928 | return ret; |
| 929 | } |
| 930 | |
| 931 | static |
| 932 | int lttng_userspace_probe_location_lookup_method_serialize( |
| 933 | struct lttng_userspace_probe_location_lookup_method *method, |
| 934 | struct lttng_dynamic_buffer *buffer) |
| 935 | { |
| 936 | int ret; |
| 937 | struct lttng_userspace_probe_location_lookup_method_comm |
| 938 | lookup_method_comm; |
| 939 | |
| 940 | lookup_method_comm.type = (int8_t) (method ? method->type : |
| 941 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT); |
| 942 | if (buffer) { |
| 943 | ret = lttng_dynamic_buffer_append(buffer, &lookup_method_comm, |
| 944 | sizeof(lookup_method_comm)); |
| 945 | if (ret) { |
| 946 | goto end; |
| 947 | } |
| 948 | } |
| 949 | ret = sizeof(lookup_method_comm); |
| 950 | end: |
| 951 | return ret; |
| 952 | } |
| 953 | |
| 954 | static |
| 955 | int lttng_userspace_probe_location_function_serialize( |
| 956 | const struct lttng_userspace_probe_location *location, |
| 957 | struct lttng_dynamic_buffer *buffer, |
| 958 | int *binary_fd) |
| 959 | { |
| 960 | int ret; |
| 961 | size_t function_name_len, binary_path_len; |
| 962 | struct lttng_userspace_probe_location_function *location_function; |
| 963 | struct lttng_userspace_probe_location_function_comm location_function_comm; |
| 964 | |
| 965 | assert(location); |
| 966 | assert(lttng_userspace_probe_location_get_type(location) == |
| 967 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
| 968 | |
| 969 | location_function = container_of(location, |
| 970 | struct lttng_userspace_probe_location_function, |
| 971 | parent); |
| 972 | if (!location_function->function_name || !location_function->binary_path) { |
| 973 | ret = -LTTNG_ERR_INVALID; |
| 974 | goto end; |
| 975 | } |
| 976 | |
| 977 | if (binary_fd && location_function->binary_fd < 0) { |
| 978 | ret = -LTTNG_ERR_INVALID; |
| 979 | goto end; |
| 980 | } |
| 981 | |
| 982 | if (binary_fd) { |
| 983 | *binary_fd = location_function->binary_fd; |
| 984 | } |
| 985 | |
| 986 | function_name_len = strlen(location_function->function_name); |
| 987 | if (function_name_len == 0) { |
| 988 | ret = -LTTNG_ERR_INVALID; |
| 989 | goto end; |
| 990 | } |
| 991 | binary_path_len = strlen(location_function->binary_path); |
| 992 | if (binary_path_len == 0) { |
| 993 | ret = -LTTNG_ERR_INVALID; |
| 994 | goto end; |
| 995 | } |
| 996 | |
| 997 | location_function_comm.function_name_len = function_name_len + 1; |
| 998 | location_function_comm.binary_path_len = binary_path_len + 1; |
| 999 | |
| 1000 | if (buffer) { |
| 1001 | ret = lttng_dynamic_buffer_append(buffer, |
| 1002 | &location_function_comm, |
| 1003 | sizeof(location_function_comm)); |
| 1004 | if (ret) { |
| 1005 | ret = -LTTNG_ERR_INVALID; |
| 1006 | goto end; |
| 1007 | } |
| 1008 | ret = lttng_dynamic_buffer_append(buffer, |
| 1009 | location_function->function_name, |
| 1010 | location_function_comm.function_name_len); |
| 1011 | if (ret) { |
| 1012 | ret = -LTTNG_ERR_INVALID; |
| 1013 | goto end; |
| 1014 | } |
| 1015 | ret = lttng_dynamic_buffer_append(buffer, |
| 1016 | location_function->binary_path, |
| 1017 | location_function_comm.binary_path_len); |
| 1018 | if (ret) { |
| 1019 | ret = -LTTNG_ERR_INVALID; |
| 1020 | goto end; |
| 1021 | } |
| 1022 | } |
| 1023 | ret = sizeof(location_function_comm) + |
| 1024 | location_function_comm.function_name_len + |
| 1025 | location_function_comm.binary_path_len; |
| 1026 | end: |
| 1027 | return ret; |
| 1028 | } |
| 1029 | |
| 1030 | static |
| 1031 | int lttng_userspace_probe_location_tracepoint_serialize( |
| 1032 | const struct lttng_userspace_probe_location *location, |
| 1033 | struct lttng_dynamic_buffer *buffer, |
| 1034 | int *binary_fd) |
| 1035 | { |
| 1036 | int ret; |
| 1037 | size_t probe_name_len, provider_name_len, binary_path_len; |
| 1038 | struct lttng_userspace_probe_location_tracepoint *location_tracepoint; |
| 1039 | struct lttng_userspace_probe_location_tracepoint_comm location_tracepoint_comm; |
| 1040 | |
| 1041 | assert(location); |
| 1042 | assert(lttng_userspace_probe_location_get_type(location) == |
| 1043 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
| 1044 | |
| 1045 | location_tracepoint = container_of(location, |
| 1046 | struct lttng_userspace_probe_location_tracepoint, |
| 1047 | parent); |
| 1048 | if (!location_tracepoint->probe_name || |
| 1049 | !location_tracepoint->provider_name || |
| 1050 | !location_tracepoint->binary_path) { |
| 1051 | ret = -LTTNG_ERR_INVALID; |
| 1052 | goto end; |
| 1053 | } |
| 1054 | |
| 1055 | if (binary_fd && location_tracepoint->binary_fd < 0) { |
| 1056 | ret = -LTTNG_ERR_INVALID; |
| 1057 | goto end; |
| 1058 | } |
| 1059 | |
| 1060 | if (binary_fd) { |
| 1061 | *binary_fd = location_tracepoint->binary_fd; |
| 1062 | } |
| 1063 | |
| 1064 | probe_name_len = strlen(location_tracepoint->probe_name); |
| 1065 | if (probe_name_len == 0) { |
| 1066 | ret = -LTTNG_ERR_INVALID; |
| 1067 | goto end; |
| 1068 | } |
| 1069 | |
| 1070 | provider_name_len = strlen(location_tracepoint->provider_name); |
| 1071 | if (provider_name_len == 0) { |
| 1072 | ret = -LTTNG_ERR_INVALID; |
| 1073 | goto end; |
| 1074 | } |
| 1075 | |
| 1076 | binary_path_len = strlen(location_tracepoint->binary_path); |
| 1077 | if (binary_path_len == 0) { |
| 1078 | ret = -LTTNG_ERR_INVALID; |
| 1079 | goto end; |
| 1080 | } |
| 1081 | |
| 1082 | location_tracepoint_comm.probe_name_len = probe_name_len + 1; |
| 1083 | location_tracepoint_comm.provider_name_len = provider_name_len + 1; |
| 1084 | location_tracepoint_comm.binary_path_len = binary_path_len + 1; |
| 1085 | |
| 1086 | if (buffer) { |
| 1087 | ret = lttng_dynamic_buffer_append(buffer, |
| 1088 | &location_tracepoint_comm, |
| 1089 | sizeof(location_tracepoint_comm)); |
| 1090 | if (ret) { |
| 1091 | ret = -LTTNG_ERR_INVALID; |
| 1092 | goto end; |
| 1093 | } |
| 1094 | ret = lttng_dynamic_buffer_append(buffer, |
| 1095 | location_tracepoint->probe_name, |
| 1096 | location_tracepoint_comm.probe_name_len); |
| 1097 | if (ret) { |
| 1098 | ret = -LTTNG_ERR_INVALID; |
| 1099 | goto end; |
| 1100 | } |
| 1101 | ret = lttng_dynamic_buffer_append(buffer, |
| 1102 | location_tracepoint->provider_name, |
| 1103 | location_tracepoint_comm.provider_name_len); |
| 1104 | if (ret) { |
| 1105 | ret = -LTTNG_ERR_INVALID; |
| 1106 | goto end; |
| 1107 | } |
| 1108 | ret = lttng_dynamic_buffer_append(buffer, |
| 1109 | location_tracepoint->binary_path, |
| 1110 | location_tracepoint_comm.binary_path_len); |
| 1111 | if (ret) { |
| 1112 | ret = -LTTNG_ERR_INVALID; |
| 1113 | goto end; |
| 1114 | } |
| 1115 | } |
| 1116 | ret = sizeof(location_tracepoint_comm) + |
| 1117 | location_tracepoint_comm.probe_name_len + |
| 1118 | location_tracepoint_comm.provider_name_len + |
| 1119 | location_tracepoint_comm.binary_path_len; |
| 1120 | end: |
| 1121 | return ret; |
| 1122 | } |
| 1123 | |
| 1124 | LTTNG_HIDDEN |
| 1125 | int lttng_userspace_probe_location_serialize( |
| 1126 | const struct lttng_userspace_probe_location *location, |
| 1127 | struct lttng_dynamic_buffer *buffer, |
| 1128 | int *binary_fd) |
| 1129 | { |
| 1130 | int ret, buffer_use = 0; |
| 1131 | struct lttng_userspace_probe_location_comm location_generic_comm; |
| 1132 | |
| 1133 | if (!location) { |
| 1134 | ERR("Invalid argument(s)"); |
| 1135 | ret = -LTTNG_ERR_INVALID; |
| 1136 | goto end; |
| 1137 | } |
| 1138 | |
| 1139 | memset(&location_generic_comm, 0, sizeof(location_generic_comm)); |
| 1140 | |
| 1141 | location_generic_comm.type = (int8_t) location->type; |
| 1142 | if (buffer) { |
| 1143 | ret = lttng_dynamic_buffer_append(buffer, &location_generic_comm, |
| 1144 | sizeof(location_generic_comm)); |
| 1145 | if (ret) { |
| 1146 | goto end; |
| 1147 | } |
| 1148 | } |
| 1149 | buffer_use += sizeof(location_generic_comm); |
| 1150 | |
| 1151 | switch (lttng_userspace_probe_location_get_type(location)) { |
| 1152 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 1153 | ret = lttng_userspace_probe_location_function_serialize( |
| 1154 | location, buffer, binary_fd); |
| 1155 | break; |
| 1156 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT: |
| 1157 | ret = lttng_userspace_probe_location_tracepoint_serialize( |
| 1158 | location, buffer, binary_fd); |
| 1159 | break; |
| 1160 | default: |
| 1161 | ERR("Unsupported probe location type"); |
| 1162 | ret = -LTTNG_ERR_INVALID; |
| 1163 | goto end; |
| 1164 | } |
| 1165 | if (ret < 0) { |
| 1166 | goto end; |
| 1167 | } |
| 1168 | buffer_use += ret; |
| 1169 | |
| 1170 | ret = lttng_userspace_probe_location_lookup_method_serialize( |
| 1171 | location->lookup_method, buffer); |
| 1172 | if (ret < 0) { |
| 1173 | goto end; |
| 1174 | } |
| 1175 | ret += buffer_use; |
| 1176 | end: |
| 1177 | return ret; |
| 1178 | } |
| 1179 | |
| 1180 | static |
| 1181 | int lttng_userspace_probe_location_function_create_from_buffer( |
| 1182 | const struct lttng_buffer_view *buffer, |
| 1183 | struct lttng_userspace_probe_location **location) |
| 1184 | { |
| 1185 | struct lttng_userspace_probe_location_function_comm *location_function_comm; |
| 1186 | const char *function_name_src, *binary_path_src; |
| 1187 | char *function_name = NULL, *binary_path = NULL; |
| 1188 | int ret = 0; |
| 1189 | |
| 1190 | assert(buffer); |
| 1191 | assert(buffer->data); |
| 1192 | assert(location); |
| 1193 | |
| 1194 | location_function_comm = |
| 1195 | (struct lttng_userspace_probe_location_function_comm *) buffer->data; |
| 1196 | |
| 1197 | const size_t expected_size = sizeof(*location_function_comm) + |
| 1198 | location_function_comm->function_name_len + |
| 1199 | location_function_comm->binary_path_len; |
| 1200 | |
| 1201 | if (buffer->size < expected_size) { |
| 1202 | ret = -LTTNG_ERR_INVALID; |
| 1203 | goto end; |
| 1204 | } |
| 1205 | |
| 1206 | function_name_src = buffer->data + sizeof(*location_function_comm); |
| 1207 | binary_path_src = function_name_src + |
| 1208 | location_function_comm->function_name_len; |
| 1209 | |
| 1210 | if (function_name_src[location_function_comm->function_name_len - 1] != '\0') { |
| 1211 | ret = -LTTNG_ERR_INVALID; |
| 1212 | goto end; |
| 1213 | } |
| 1214 | if (binary_path_src[location_function_comm->binary_path_len - 1] != '\0') { |
| 1215 | ret = -LTTNG_ERR_INVALID; |
| 1216 | goto end; |
| 1217 | } |
| 1218 | |
| 1219 | function_name = lttng_strndup(function_name_src, LTTNG_SYMBOL_NAME_LEN); |
| 1220 | if (!function_name) { |
| 1221 | PERROR("lttng_strndup"); |
| 1222 | ret = -LTTNG_ERR_NOMEM; |
| 1223 | goto end; |
| 1224 | } |
| 1225 | |
| 1226 | binary_path = lttng_strndup(binary_path_src, LTTNG_PATH_MAX); |
| 1227 | if (!binary_path) { |
| 1228 | PERROR("lttng_strndup"); |
| 1229 | ret = -LTTNG_ERR_NOMEM; |
| 1230 | goto end; |
| 1231 | } |
| 1232 | |
| 1233 | *location = lttng_userspace_probe_location_function_create_no_check( |
| 1234 | binary_path, function_name, NULL, false); |
| 1235 | if (!(*location)) { |
| 1236 | ret = -LTTNG_ERR_INVALID; |
| 1237 | goto end; |
| 1238 | } |
| 1239 | |
| 1240 | ret = (int) expected_size; |
| 1241 | end: |
| 1242 | free(function_name); |
| 1243 | free(binary_path); |
| 1244 | return ret; |
| 1245 | } |
| 1246 | |
| 1247 | static |
| 1248 | int lttng_userspace_probe_location_tracepoint_create_from_buffer( |
| 1249 | const struct lttng_buffer_view *buffer, |
| 1250 | struct lttng_userspace_probe_location **location) |
| 1251 | { |
| 1252 | struct lttng_userspace_probe_location_tracepoint_comm *location_tracepoint_comm; |
| 1253 | const char *probe_name_src, *provider_name_src, *binary_path_src; |
| 1254 | char *probe_name = NULL, *provider_name = NULL, *binary_path = NULL; |
| 1255 | int ret = 0; |
| 1256 | |
| 1257 | assert(buffer); |
| 1258 | assert(buffer->data); |
| 1259 | assert(location); |
| 1260 | |
| 1261 | location_tracepoint_comm = |
| 1262 | (struct lttng_userspace_probe_location_tracepoint_comm *) buffer->data; |
| 1263 | |
| 1264 | const size_t expected_size = sizeof(*location_tracepoint_comm) + |
| 1265 | location_tracepoint_comm->probe_name_len + |
| 1266 | location_tracepoint_comm->provider_name_len + |
| 1267 | location_tracepoint_comm->binary_path_len; |
| 1268 | |
| 1269 | if (buffer->size < expected_size) { |
| 1270 | ret = -LTTNG_ERR_INVALID; |
| 1271 | goto end; |
| 1272 | } |
| 1273 | |
| 1274 | probe_name_src = buffer->data + sizeof(*location_tracepoint_comm); |
| 1275 | provider_name_src = probe_name_src + |
| 1276 | location_tracepoint_comm->probe_name_len; |
| 1277 | binary_path_src = provider_name_src + |
| 1278 | location_tracepoint_comm->provider_name_len; |
| 1279 | |
| 1280 | if (probe_name_src[location_tracepoint_comm->probe_name_len - 1] != '\0') { |
| 1281 | ret = -LTTNG_ERR_INVALID; |
| 1282 | goto end; |
| 1283 | } |
| 1284 | |
| 1285 | if (provider_name_src[location_tracepoint_comm->provider_name_len - 1] != '\0') { |
| 1286 | ret = -LTTNG_ERR_INVALID; |
| 1287 | goto end; |
| 1288 | } |
| 1289 | |
| 1290 | if (binary_path_src[location_tracepoint_comm->binary_path_len - 1] != '\0') { |
| 1291 | ret = -LTTNG_ERR_INVALID; |
| 1292 | goto end; |
| 1293 | } |
| 1294 | |
| 1295 | probe_name = lttng_strndup(probe_name_src, LTTNG_SYMBOL_NAME_LEN); |
| 1296 | if (!probe_name) { |
| 1297 | PERROR("lttng_strndup"); |
| 1298 | goto end; |
| 1299 | } |
| 1300 | provider_name = lttng_strndup(provider_name_src, LTTNG_SYMBOL_NAME_LEN); |
| 1301 | if (!provider_name) { |
| 1302 | PERROR("lttng_strndup"); |
| 1303 | goto end; |
| 1304 | } |
| 1305 | |
| 1306 | binary_path = lttng_strndup(binary_path_src, LTTNG_SYMBOL_NAME_LEN); |
| 1307 | if (!binary_path) { |
| 1308 | PERROR("lttng_strndup"); |
| 1309 | goto end; |
| 1310 | } |
| 1311 | |
| 1312 | *location = lttng_userspace_probe_location_tracepoint_create_no_check( |
| 1313 | binary_path, provider_name, probe_name, NULL, false); |
| 1314 | if (!(*location)) { |
| 1315 | ret = -LTTNG_ERR_INVALID; |
| 1316 | goto end; |
| 1317 | } |
| 1318 | |
| 1319 | ret = (int) expected_size; |
| 1320 | end: |
| 1321 | free(probe_name); |
| 1322 | free(provider_name); |
| 1323 | free(binary_path); |
| 1324 | return ret; |
| 1325 | } |
| 1326 | |
| 1327 | static |
| 1328 | int lttng_userspace_probe_location_lookup_method_create_from_buffer( |
| 1329 | struct lttng_buffer_view *buffer, |
| 1330 | struct lttng_userspace_probe_location_lookup_method **lookup_method) |
| 1331 | { |
| 1332 | int ret; |
| 1333 | struct lttng_userspace_probe_location_lookup_method_comm *lookup_comm; |
| 1334 | enum lttng_userspace_probe_location_lookup_method_type type; |
| 1335 | |
| 1336 | assert(buffer); |
| 1337 | assert(buffer->data); |
| 1338 | assert(lookup_method); |
| 1339 | |
| 1340 | if (buffer->size < sizeof(*lookup_comm)) { |
| 1341 | ret = -LTTNG_ERR_INVALID; |
| 1342 | goto end; |
| 1343 | } |
| 1344 | |
| 1345 | lookup_comm = (struct lttng_userspace_probe_location_lookup_method_comm *) |
| 1346 | buffer->data; |
| 1347 | type = (enum lttng_userspace_probe_location_lookup_method_type) |
| 1348 | lookup_comm->type; |
| 1349 | switch (type) { |
| 1350 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT: |
| 1351 | *lookup_method = NULL; |
| 1352 | break; |
| 1353 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 1354 | *lookup_method = |
| 1355 | lttng_userspace_probe_location_lookup_method_function_elf_create(); |
| 1356 | if (!(*lookup_method)) { |
| 1357 | ret = -LTTNG_ERR_INVALID; |
| 1358 | goto end; |
| 1359 | } |
| 1360 | break; |
| 1361 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 1362 | *lookup_method = |
| 1363 | lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create(); |
| 1364 | if (!(*lookup_method)) { |
| 1365 | ret = -LTTNG_ERR_INVALID; |
| 1366 | goto end; |
| 1367 | } |
| 1368 | break; |
| 1369 | default: |
| 1370 | ret = -LTTNG_ERR_INVALID; |
| 1371 | goto end; |
| 1372 | } |
| 1373 | |
| 1374 | ret = sizeof(*lookup_comm); |
| 1375 | end: |
| 1376 | return ret; |
| 1377 | } |
| 1378 | |
| 1379 | LTTNG_HIDDEN |
| 1380 | int lttng_userspace_probe_location_create_from_buffer( |
| 1381 | const struct lttng_buffer_view *buffer, |
| 1382 | struct lttng_userspace_probe_location **location) |
| 1383 | { |
| 1384 | struct lttng_userspace_probe_location_lookup_method *lookup_method; |
| 1385 | struct lttng_userspace_probe_location_comm *probe_location_comm; |
| 1386 | enum lttng_userspace_probe_location_type type; |
| 1387 | struct lttng_buffer_view lookup_method_view; |
| 1388 | int consumed = 0; |
| 1389 | int ret; |
| 1390 | |
| 1391 | |
| 1392 | assert(buffer); |
| 1393 | assert(buffer->data); |
| 1394 | assert(location); |
| 1395 | |
| 1396 | lookup_method = NULL; |
| 1397 | |
| 1398 | if (buffer->size <= sizeof(*probe_location_comm)) { |
| 1399 | ret = -LTTNG_ERR_INVALID; |
| 1400 | goto end; |
| 1401 | } |
| 1402 | |
| 1403 | probe_location_comm = |
| 1404 | (struct lttng_userspace_probe_location_comm *) buffer->data; |
| 1405 | type = (enum lttng_userspace_probe_location_type) probe_location_comm->type; |
| 1406 | consumed += sizeof(*probe_location_comm); |
| 1407 | |
| 1408 | switch (type) { |
| 1409 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 1410 | { |
| 1411 | struct lttng_buffer_view view = lttng_buffer_view_from_view( |
| 1412 | buffer, consumed, buffer->size - consumed); |
| 1413 | |
| 1414 | ret = lttng_userspace_probe_location_function_create_from_buffer( |
| 1415 | &view, location); |
| 1416 | if (ret < 0) { |
| 1417 | goto end; |
| 1418 | } |
| 1419 | break; |
| 1420 | } |
| 1421 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT: |
| 1422 | { |
| 1423 | struct lttng_buffer_view view = lttng_buffer_view_from_view( |
| 1424 | buffer, consumed, buffer->size - consumed); |
| 1425 | |
| 1426 | ret = lttng_userspace_probe_location_tracepoint_create_from_buffer( |
| 1427 | &view, location); |
| 1428 | if (ret < 0) { |
| 1429 | goto end; |
| 1430 | } |
| 1431 | break; |
| 1432 | } |
| 1433 | default: |
| 1434 | ret = -LTTNG_ERR_INVALID; |
| 1435 | goto end; |
| 1436 | } |
| 1437 | |
| 1438 | consumed += ret; |
| 1439 | if (buffer->size <= consumed) { |
| 1440 | ret = -LTTNG_ERR_INVALID; |
| 1441 | goto end; |
| 1442 | } |
| 1443 | |
| 1444 | lookup_method_view = lttng_buffer_view_from_view(buffer, consumed, |
| 1445 | buffer->size - consumed); |
| 1446 | ret = lttng_userspace_probe_location_lookup_method_create_from_buffer( |
| 1447 | &lookup_method_view, &lookup_method); |
| 1448 | if (ret < 0) { |
| 1449 | ret = -LTTNG_ERR_INVALID; |
| 1450 | goto end; |
| 1451 | } |
| 1452 | |
| 1453 | assert(lookup_method); |
| 1454 | (*location)->lookup_method = lookup_method; |
| 1455 | lookup_method = NULL; |
| 1456 | ret += consumed; |
| 1457 | end: |
| 1458 | return ret; |
| 1459 | } |
| 1460 | |
| 1461 | LTTNG_HIDDEN |
| 1462 | int lttng_userspace_probe_location_function_set_binary_fd( |
| 1463 | struct lttng_userspace_probe_location *location, int binary_fd) |
| 1464 | { |
| 1465 | int ret = 0; |
| 1466 | struct lttng_userspace_probe_location_function *function_location; |
| 1467 | |
| 1468 | assert(location); |
| 1469 | assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
| 1470 | |
| 1471 | function_location = container_of(location, |
| 1472 | struct lttng_userspace_probe_location_function, parent); |
| 1473 | if (function_location->binary_fd >= 0) { |
| 1474 | ret = close(function_location->binary_fd); |
| 1475 | if (ret) { |
| 1476 | PERROR("close"); |
| 1477 | ret = -LTTNG_ERR_INVALID; |
| 1478 | goto end; |
| 1479 | } |
| 1480 | } |
| 1481 | |
| 1482 | function_location->binary_fd = binary_fd; |
| 1483 | end: |
| 1484 | return ret; |
| 1485 | } |
| 1486 | |
| 1487 | LTTNG_HIDDEN |
| 1488 | int lttng_userspace_probe_location_tracepoint_set_binary_fd( |
| 1489 | struct lttng_userspace_probe_location *location, int binary_fd) |
| 1490 | { |
| 1491 | int ret = 0; |
| 1492 | struct lttng_userspace_probe_location_tracepoint *tracepoint_location; |
| 1493 | |
| 1494 | assert(location); |
| 1495 | assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
| 1496 | |
| 1497 | tracepoint_location = container_of(location, |
| 1498 | struct lttng_userspace_probe_location_tracepoint, parent); |
| 1499 | if (tracepoint_location->binary_fd >= 0) { |
| 1500 | ret = close(tracepoint_location->binary_fd); |
| 1501 | if (ret) { |
| 1502 | PERROR("close"); |
| 1503 | ret = -LTTNG_ERR_INVALID; |
| 1504 | goto end; |
| 1505 | } |
| 1506 | } |
| 1507 | |
| 1508 | tracepoint_location->binary_fd = binary_fd; |
| 1509 | end: |
| 1510 | return ret; |
| 1511 | } |
| 1512 | |
| 1513 | static |
| 1514 | int lttng_userspace_probe_location_function_flatten( |
| 1515 | const struct lttng_userspace_probe_location *location, |
| 1516 | struct lttng_dynamic_buffer *buffer) |
| 1517 | { |
| 1518 | struct lttng_userspace_probe_location_lookup_method_elf flat_lookup_method; |
| 1519 | struct lttng_userspace_probe_location_function *probe_function; |
| 1520 | struct lttng_userspace_probe_location_function flat_probe; |
| 1521 | size_t function_name_len, binary_path_len; |
| 1522 | size_t padding_needed = 0; |
| 1523 | char *flat_probe_start; |
| 1524 | int storage_needed = 0; |
| 1525 | int ret; |
| 1526 | |
| 1527 | assert(location); |
| 1528 | |
| 1529 | if (location->lookup_method && location->lookup_method->type != |
| 1530 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF) { |
| 1531 | ret = -LTTNG_ERR_INVALID; |
| 1532 | goto end; |
| 1533 | } |
| 1534 | |
| 1535 | probe_function = container_of(location, |
| 1536 | struct lttng_userspace_probe_location_function, |
| 1537 | parent); |
| 1538 | assert(probe_function->function_name); |
| 1539 | assert(probe_function->binary_path); |
| 1540 | |
| 1541 | storage_needed += |
| 1542 | sizeof(struct lttng_userspace_probe_location_function); |
| 1543 | function_name_len = strlen(probe_function->function_name) + 1; |
| 1544 | binary_path_len = strlen(probe_function->binary_path) + 1; |
| 1545 | storage_needed += function_name_len + binary_path_len; |
| 1546 | |
| 1547 | /* |
| 1548 | * The lookup method is aligned to 64-bit within the buffer. |
| 1549 | * This is needed even if there is no lookup method since |
| 1550 | * the next structure in the buffer probably needs to be |
| 1551 | * aligned too (depending on the arch). |
| 1552 | */ |
| 1553 | padding_needed = ALIGN_TO(storage_needed, sizeof(uint64_t)) - storage_needed; |
| 1554 | storage_needed += padding_needed; |
| 1555 | |
| 1556 | if (location->lookup_method) { |
| 1557 | /* NOTE: elf look-up method is assumed here. */ |
| 1558 | storage_needed += sizeof(struct lttng_userspace_probe_location_lookup_method_elf); |
| 1559 | } |
| 1560 | |
| 1561 | if (!buffer) { |
| 1562 | ret = storage_needed; |
| 1563 | goto end; |
| 1564 | } |
| 1565 | |
| 1566 | if (lttng_dynamic_buffer_get_capacity_left(buffer) < storage_needed) { |
| 1567 | ret = lttng_dynamic_buffer_set_capacity(buffer, |
| 1568 | buffer->size + storage_needed); |
| 1569 | if (ret) { |
| 1570 | goto end; |
| 1571 | } |
| 1572 | } |
| 1573 | |
| 1574 | memset(&flat_probe, 0, sizeof(flat_probe)); |
| 1575 | |
| 1576 | flat_probe_start = buffer->data + buffer->size; |
| 1577 | flat_probe.parent.type = location->type; |
| 1578 | /* |
| 1579 | * The lookup method, if present, is the last element in the flat |
| 1580 | * representation of the probe. |
| 1581 | */ |
| 1582 | if (location->lookup_method) { |
| 1583 | flat_probe.parent.lookup_method = |
| 1584 | (struct lttng_userspace_probe_location_lookup_method *) |
| 1585 | (flat_probe_start + sizeof(flat_probe) + |
| 1586 | function_name_len + binary_path_len + padding_needed); |
| 1587 | } else { |
| 1588 | flat_probe.parent.lookup_method = NULL; |
| 1589 | } |
| 1590 | |
| 1591 | flat_probe.function_name = flat_probe_start + sizeof(flat_probe); |
| 1592 | flat_probe.binary_path = flat_probe.function_name + function_name_len; |
| 1593 | flat_probe.binary_fd = -1; |
| 1594 | ret = lttng_dynamic_buffer_append(buffer, &flat_probe, |
| 1595 | sizeof(flat_probe)); |
| 1596 | if (ret) { |
| 1597 | goto end; |
| 1598 | } |
| 1599 | |
| 1600 | ret = lttng_dynamic_buffer_append(buffer, |
| 1601 | probe_function->function_name, function_name_len); |
| 1602 | if (ret) { |
| 1603 | goto end; |
| 1604 | } |
| 1605 | ret = lttng_dynamic_buffer_append(buffer, |
| 1606 | probe_function->binary_path, binary_path_len); |
| 1607 | if (ret) { |
| 1608 | goto end; |
| 1609 | } |
| 1610 | |
| 1611 | /* Insert padding before the lookup method. */ |
| 1612 | ret = lttng_dynamic_buffer_set_size(buffer, |
| 1613 | buffer->size + padding_needed); |
| 1614 | if (ret) { |
| 1615 | goto end; |
| 1616 | } |
| 1617 | |
| 1618 | if (!location->lookup_method) { |
| 1619 | /* Not an error, the default method is used. */ |
| 1620 | ret = storage_needed; |
| 1621 | goto end; |
| 1622 | } |
| 1623 | |
| 1624 | memset(&flat_lookup_method, 0, sizeof(flat_lookup_method)); |
| 1625 | flat_lookup_method.parent.type = |
| 1626 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF; |
| 1627 | ret = lttng_dynamic_buffer_append(buffer, |
| 1628 | &flat_lookup_method, sizeof(flat_lookup_method)); |
| 1629 | if (ret) { |
| 1630 | goto end; |
| 1631 | } |
| 1632 | ret = storage_needed; |
| 1633 | end: |
| 1634 | return ret; |
| 1635 | } |
| 1636 | |
| 1637 | static |
| 1638 | int lttng_userspace_probe_location_tracepoint_flatten( |
| 1639 | const struct lttng_userspace_probe_location *location, |
| 1640 | struct lttng_dynamic_buffer *buffer) |
| 1641 | { |
| 1642 | struct lttng_userspace_probe_location_lookup_method_sdt flat_lookup_method; |
| 1643 | struct lttng_userspace_probe_location_tracepoint *probe_tracepoint; |
| 1644 | struct lttng_userspace_probe_location_tracepoint flat_probe; |
| 1645 | size_t probe_name_len, provider_name_len, binary_path_len; |
| 1646 | size_t padding_needed = 0; |
| 1647 | int storage_needed = 0; |
| 1648 | char *flat_probe_start; |
| 1649 | int ret = 0; |
| 1650 | |
| 1651 | assert(location); |
| 1652 | |
| 1653 | /* Only SDT tracepoints are supported at the moment */ |
| 1654 | if (location->lookup_method && location->lookup_method->type != |
| 1655 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT) { |
| 1656 | ret = -LTTNG_ERR_INVALID; |
| 1657 | goto end; |
| 1658 | } |
| 1659 | probe_tracepoint = container_of(location, |
| 1660 | struct lttng_userspace_probe_location_tracepoint, |
| 1661 | parent); |
| 1662 | assert(probe_tracepoint->probe_name); |
| 1663 | assert(probe_tracepoint->provider_name); |
| 1664 | assert(probe_tracepoint->binary_path); |
| 1665 | |
| 1666 | /* Compute the storage space needed to flatten the probe location */ |
| 1667 | storage_needed += sizeof(struct lttng_userspace_probe_location_tracepoint); |
| 1668 | |
| 1669 | probe_name_len = strlen(probe_tracepoint->probe_name) + 1; |
| 1670 | provider_name_len = strlen(probe_tracepoint->provider_name) + 1; |
| 1671 | binary_path_len = strlen(probe_tracepoint->binary_path) + 1; |
| 1672 | |
| 1673 | storage_needed += probe_name_len + provider_name_len + binary_path_len; |
| 1674 | |
| 1675 | /* |
| 1676 | * The lookup method is aligned to 64-bit within the buffer. |
| 1677 | * This is needed even if there is no lookup method since |
| 1678 | * the next structure in the buffer probably needs to be |
| 1679 | * aligned too (depending on the arch). |
| 1680 | */ |
| 1681 | padding_needed = ALIGN_TO(storage_needed, sizeof(uint64_t)) - storage_needed; |
| 1682 | storage_needed += padding_needed; |
| 1683 | |
| 1684 | if (location->lookup_method) { |
| 1685 | /* NOTE: elf look-up method is assumed here. */ |
| 1686 | storage_needed += |
| 1687 | sizeof(struct lttng_userspace_probe_location_lookup_method_elf); |
| 1688 | } |
| 1689 | |
| 1690 | /* |
| 1691 | * If the caller set buffer to NULL, return the size of the needed buffer. |
| 1692 | */ |
| 1693 | if (!buffer) { |
| 1694 | ret = storage_needed; |
| 1695 | goto end; |
| 1696 | } |
| 1697 | |
| 1698 | if (lttng_dynamic_buffer_get_capacity_left(buffer) < storage_needed) { |
| 1699 | ret = lttng_dynamic_buffer_set_capacity(buffer, |
| 1700 | buffer->size + storage_needed); |
| 1701 | if (ret) { |
| 1702 | goto end; |
| 1703 | } |
| 1704 | } |
| 1705 | |
| 1706 | memset(&flat_probe, 0, sizeof(flat_probe)); |
| 1707 | |
| 1708 | flat_probe_start = buffer->data + buffer->size; |
| 1709 | flat_probe.parent.type = location->type; |
| 1710 | |
| 1711 | /* |
| 1712 | * The lookup method, if present, is the last element in the flat |
| 1713 | * representation of the probe. |
| 1714 | */ |
| 1715 | if (location->lookup_method) { |
| 1716 | flat_probe.parent.lookup_method = |
| 1717 | (struct lttng_userspace_probe_location_lookup_method *) |
| 1718 | (flat_probe_start + sizeof(flat_probe) + |
| 1719 | probe_name_len + provider_name_len + |
| 1720 | binary_path_len + padding_needed); |
| 1721 | } else { |
| 1722 | flat_probe.parent.lookup_method = NULL; |
| 1723 | } |
| 1724 | |
| 1725 | flat_probe.probe_name = flat_probe_start + sizeof(flat_probe); |
| 1726 | flat_probe.provider_name = flat_probe.probe_name + probe_name_len; |
| 1727 | flat_probe.binary_path = flat_probe.provider_name + provider_name_len; |
| 1728 | flat_probe.binary_fd = -1; |
| 1729 | ret = lttng_dynamic_buffer_append(buffer, &flat_probe, sizeof(flat_probe)); |
| 1730 | if (ret) { |
| 1731 | goto end; |
| 1732 | } |
| 1733 | |
| 1734 | /* Append all the fields to the buffer */ |
| 1735 | ret = lttng_dynamic_buffer_append(buffer, |
| 1736 | probe_tracepoint->probe_name, probe_name_len); |
| 1737 | if (ret) { |
| 1738 | goto end; |
| 1739 | } |
| 1740 | ret = lttng_dynamic_buffer_append(buffer, |
| 1741 | probe_tracepoint->provider_name, provider_name_len); |
| 1742 | if (ret) { |
| 1743 | goto end; |
| 1744 | } |
| 1745 | ret = lttng_dynamic_buffer_append(buffer, |
| 1746 | probe_tracepoint->binary_path, binary_path_len); |
| 1747 | if (ret) { |
| 1748 | goto end; |
| 1749 | } |
| 1750 | |
| 1751 | /* Insert padding before the lookup method. */ |
| 1752 | ret = lttng_dynamic_buffer_set_size(buffer, buffer->size + padding_needed); |
| 1753 | if (ret) { |
| 1754 | goto end; |
| 1755 | } |
| 1756 | |
| 1757 | if (!location->lookup_method) { |
| 1758 | /* Not an error, the default method is used. */ |
| 1759 | ret = storage_needed; |
| 1760 | goto end; |
| 1761 | } |
| 1762 | |
| 1763 | memset(&flat_lookup_method, 0, sizeof(flat_lookup_method)); |
| 1764 | |
| 1765 | flat_lookup_method.parent.type = |
| 1766 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT; |
| 1767 | ret = lttng_dynamic_buffer_append(buffer, |
| 1768 | &flat_lookup_method, sizeof(flat_lookup_method)); |
| 1769 | if (ret) { |
| 1770 | goto end; |
| 1771 | } |
| 1772 | ret = storage_needed; |
| 1773 | end: |
| 1774 | return ret; |
| 1775 | } |
| 1776 | |
| 1777 | LTTNG_HIDDEN |
| 1778 | int lttng_userspace_probe_location_flatten( |
| 1779 | const struct lttng_userspace_probe_location *location, |
| 1780 | struct lttng_dynamic_buffer *buffer) |
| 1781 | { |
| 1782 | int ret; |
| 1783 | if (!location) { |
| 1784 | ret = -LTTNG_ERR_INVALID; |
| 1785 | goto end; |
| 1786 | } |
| 1787 | |
| 1788 | /* Only types currently supported. */ |
| 1789 | switch (location->type) { |
| 1790 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 1791 | ret = lttng_userspace_probe_location_function_flatten(location, buffer); |
| 1792 | break; |
| 1793 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT: |
| 1794 | ret = lttng_userspace_probe_location_tracepoint_flatten(location, buffer); |
| 1795 | break; |
| 1796 | default: |
| 1797 | ret = -LTTNG_ERR_INVALID; |
| 1798 | goto end; |
| 1799 | } |
| 1800 | |
| 1801 | end: |
| 1802 | return ret; |
| 1803 | } |
| 1804 | |
| 1805 | LTTNG_HIDDEN |
| 1806 | struct lttng_userspace_probe_location *lttng_userspace_probe_location_copy( |
| 1807 | const struct lttng_userspace_probe_location *location) |
| 1808 | { |
| 1809 | struct lttng_userspace_probe_location *new_location = NULL; |
| 1810 | enum lttng_userspace_probe_location_type type; |
| 1811 | |
| 1812 | if (!location) { |
| 1813 | goto err; |
| 1814 | } |
| 1815 | |
| 1816 | type = lttng_userspace_probe_location_get_type(location); |
| 1817 | switch (type) { |
| 1818 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 1819 | new_location = |
| 1820 | lttng_userspace_probe_location_function_copy(location); |
| 1821 | if (!new_location) { |
| 1822 | goto err; |
| 1823 | } |
| 1824 | break; |
| 1825 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT: |
| 1826 | new_location = |
| 1827 | lttng_userspace_probe_location_tracepoint_copy(location); |
| 1828 | if (!new_location) { |
| 1829 | goto err; |
| 1830 | } |
| 1831 | break; |
| 1832 | default: |
| 1833 | new_location = NULL; |
| 1834 | goto err; |
| 1835 | } |
| 1836 | err: |
| 1837 | return new_location; |
| 1838 | } |
| 1839 | |
| 1840 | LTTNG_HIDDEN |
| 1841 | bool lttng_userspace_probe_location_lookup_method_is_equal( |
| 1842 | const struct lttng_userspace_probe_location_lookup_method *a, |
| 1843 | const struct lttng_userspace_probe_location_lookup_method *b) |
| 1844 | { |
| 1845 | bool is_equal = false; |
| 1846 | |
| 1847 | if (!a || !b) { |
| 1848 | goto end; |
| 1849 | } |
| 1850 | |
| 1851 | if (a == b) { |
| 1852 | is_equal = true; |
| 1853 | goto end; |
| 1854 | } |
| 1855 | |
| 1856 | if (a->type != b->type) { |
| 1857 | goto end; |
| 1858 | } |
| 1859 | |
| 1860 | is_equal = true; |
| 1861 | end: |
| 1862 | return is_equal; |
| 1863 | } |
| 1864 | |
| 1865 | LTTNG_HIDDEN |
| 1866 | bool lttng_userspace_probe_location_is_equal( |
| 1867 | const struct lttng_userspace_probe_location *a, |
| 1868 | const struct lttng_userspace_probe_location *b) |
| 1869 | { |
| 1870 | bool is_equal = false; |
| 1871 | |
| 1872 | if (!a || !b) { |
| 1873 | goto end; |
| 1874 | } |
| 1875 | |
| 1876 | if (a == b) { |
| 1877 | is_equal = true; |
| 1878 | goto end; |
| 1879 | } |
| 1880 | |
| 1881 | if (!lttng_userspace_probe_location_lookup_method_is_equal( |
| 1882 | a->lookup_method, b->lookup_method)) { |
| 1883 | goto end; |
| 1884 | } |
| 1885 | |
| 1886 | if (a->type != b->type) { |
| 1887 | goto end; |
| 1888 | } |
| 1889 | |
| 1890 | is_equal = a->equal ? a->equal(a, b) : true; |
| 1891 | end: |
| 1892 | return is_equal; |
| 1893 | } |