| 1 | /* |
| 2 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This library 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 Lesser General Public License |
| 11 | * for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public License |
| 14 | * along with this library; if not, write to the Free Software Foundation, |
| 15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | #include <assert.h> |
| 19 | #include <common/error.h> |
| 20 | #include <common/macros.h> |
| 21 | #include <common/compat/string.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <lttng/constant.h> |
| 24 | #include <lttng/userspace-probe-internal.h> |
| 25 | |
| 26 | enum lttng_userspace_probe_location_lookup_method_type |
| 27 | lttng_userspace_probe_location_lookup_method_get_type( |
| 28 | const struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 29 | { |
| 30 | return lookup_method ? lookup_method->type : |
| 31 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_UNKNOWN; |
| 32 | } |
| 33 | |
| 34 | void lttng_userspace_probe_location_lookup_method_destroy( |
| 35 | struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 36 | { |
| 37 | if (!lookup_method){ |
| 38 | return; |
| 39 | } |
| 40 | |
| 41 | switch (lookup_method->type) { |
| 42 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 43 | { |
| 44 | struct lttng_userspace_probe_location_lookup_method_elf *elf_method = |
| 45 | container_of(lookup_method, |
| 46 | struct lttng_userspace_probe_location_lookup_method_elf, parent); |
| 47 | free(elf_method); |
| 48 | break; |
| 49 | } |
| 50 | default: |
| 51 | break; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | struct lttng_userspace_probe_location_lookup_method * |
| 56 | lttng_userspace_probe_location_lookup_method_function_elf_create(void) |
| 57 | { |
| 58 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 59 | struct lttng_userspace_probe_location_lookup_method_elf *elf_method; |
| 60 | |
| 61 | elf_method = zmalloc(sizeof(*elf_method)); |
| 62 | if (!elf_method) { |
| 63 | PERROR("zmalloc"); |
| 64 | goto end; |
| 65 | } |
| 66 | |
| 67 | ret = &elf_method->parent; |
| 68 | ret->type = LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF; |
| 69 | end: |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | enum lttng_userspace_probe_location_type lttng_userspace_probe_location_get_type( |
| 74 | const struct lttng_userspace_probe_location *location) |
| 75 | { |
| 76 | return location ? location->type : |
| 77 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_UNKNOWN; |
| 78 | } |
| 79 | |
| 80 | static |
| 81 | void lttng_userspace_probe_location_function_destroy( |
| 82 | struct lttng_userspace_probe_location *location) |
| 83 | { |
| 84 | struct lttng_userspace_probe_location_function *location_function = NULL; |
| 85 | |
| 86 | assert(location); |
| 87 | |
| 88 | location_function = container_of(location, |
| 89 | struct lttng_userspace_probe_location_function, parent); |
| 90 | |
| 91 | assert(location_function); |
| 92 | |
| 93 | free(location_function->function_name); |
| 94 | free(location_function->binary_path); |
| 95 | if (location_function->binary_fd >= 0) { |
| 96 | if (close(location_function->binary_fd)) { |
| 97 | PERROR("close"); |
| 98 | } |
| 99 | } |
| 100 | free(location); |
| 101 | } |
| 102 | |
| 103 | void lttng_userspace_probe_location_destroy( |
| 104 | struct lttng_userspace_probe_location *location) |
| 105 | { |
| 106 | if (!location) { |
| 107 | return; |
| 108 | } |
| 109 | |
| 110 | lttng_userspace_probe_location_lookup_method_destroy( |
| 111 | location->lookup_method); |
| 112 | |
| 113 | switch (location->type) { |
| 114 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 115 | lttng_userspace_probe_location_function_destroy(location); |
| 116 | break; |
| 117 | default: |
| 118 | free(location); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static struct lttng_userspace_probe_location * |
| 123 | lttng_userspace_probe_location_function_create_no_check(const char *binary_path, |
| 124 | const char *function_name, |
| 125 | struct lttng_userspace_probe_location_lookup_method *lookup_method, |
| 126 | bool open_binary) |
| 127 | { |
| 128 | int binary_fd = -1; |
| 129 | char *function_name_copy = NULL, *binary_path_copy = NULL; |
| 130 | struct lttng_userspace_probe_location *ret = NULL; |
| 131 | struct lttng_userspace_probe_location_function *location; |
| 132 | |
| 133 | if (open_binary) { |
| 134 | binary_fd = open(binary_path, O_RDONLY); |
| 135 | if (binary_fd < 0) { |
| 136 | PERROR("Error opening the binary"); |
| 137 | goto error; |
| 138 | } |
| 139 | } else { |
| 140 | binary_fd = -1; |
| 141 | } |
| 142 | |
| 143 | function_name_copy = lttng_strndup(function_name, LTTNG_SYMBOL_NAME_LEN); |
| 144 | if (!function_name_copy) { |
| 145 | PERROR("Error duplicating the function name"); |
| 146 | goto error; |
| 147 | } |
| 148 | |
| 149 | binary_path_copy = lttng_strndup(binary_path, LTTNG_PATH_MAX); |
| 150 | if (!binary_path_copy) { |
| 151 | PERROR("Error duplicating the function name"); |
| 152 | goto error; |
| 153 | } |
| 154 | |
| 155 | location = zmalloc(sizeof(*location)); |
| 156 | if (!location) { |
| 157 | PERROR("Error allocating userspace probe location"); |
| 158 | goto error; |
| 159 | } |
| 160 | |
| 161 | location->function_name = function_name_copy; |
| 162 | location->binary_path = binary_path_copy; |
| 163 | location->binary_fd = binary_fd; |
| 164 | |
| 165 | ret = &location->parent; |
| 166 | ret->lookup_method = lookup_method; |
| 167 | ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION; |
| 168 | goto end; |
| 169 | |
| 170 | error: |
| 171 | free(function_name_copy); |
| 172 | free(binary_path_copy); |
| 173 | if (binary_fd >= 0) { |
| 174 | if (close(binary_fd)) { |
| 175 | PERROR("Error closing binary fd in error path"); |
| 176 | } |
| 177 | } |
| 178 | end: |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | struct lttng_userspace_probe_location * |
| 183 | lttng_userspace_probe_location_function_create(const char *binary_path, |
| 184 | const char *function_name, |
| 185 | struct lttng_userspace_probe_location_lookup_method *lookup_method) |
| 186 | { |
| 187 | struct lttng_userspace_probe_location *ret = NULL; |
| 188 | |
| 189 | if (!binary_path || !function_name) { |
| 190 | ERR("Invalid argument(s)"); |
| 191 | goto end; |
| 192 | } |
| 193 | |
| 194 | switch (lttng_userspace_probe_location_lookup_method_get_type( |
| 195 | lookup_method)) { |
| 196 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT: |
| 197 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 198 | break; |
| 199 | default: |
| 200 | /* Invalid probe location lookup method. */ |
| 201 | goto end; |
| 202 | } |
| 203 | |
| 204 | ret = lttng_userspace_probe_location_function_create_no_check( |
| 205 | binary_path, function_name, lookup_method, true); |
| 206 | end: |
| 207 | return ret; |
| 208 | } |
| 209 | |
| 210 | const char *lttng_userspace_probe_location_function_get_binary_path( |
| 211 | const struct lttng_userspace_probe_location *location) |
| 212 | { |
| 213 | const char *ret = NULL; |
| 214 | struct lttng_userspace_probe_location_function *function_location; |
| 215 | |
| 216 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 217 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 218 | ERR("Invalid argument(s)"); |
| 219 | goto end; |
| 220 | } |
| 221 | |
| 222 | function_location = container_of(location, |
| 223 | struct lttng_userspace_probe_location_function, |
| 224 | parent); |
| 225 | ret = function_location->binary_path; |
| 226 | end: |
| 227 | return ret; |
| 228 | } |
| 229 | |
| 230 | const char *lttng_userspace_probe_location_function_get_function_name( |
| 231 | const struct lttng_userspace_probe_location *location) |
| 232 | { |
| 233 | const char *ret = NULL; |
| 234 | struct lttng_userspace_probe_location_function *function_location; |
| 235 | |
| 236 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 237 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 238 | ERR("Invalid argument(s)"); |
| 239 | goto end; |
| 240 | } |
| 241 | |
| 242 | function_location = container_of(location, |
| 243 | struct lttng_userspace_probe_location_function, parent); |
| 244 | ret = function_location->function_name; |
| 245 | end: |
| 246 | return ret; |
| 247 | } |
| 248 | |
| 249 | int lttng_userspace_probe_location_function_get_binary_fd( |
| 250 | const struct lttng_userspace_probe_location *location) |
| 251 | { |
| 252 | int ret = -1; |
| 253 | struct lttng_userspace_probe_location_function *function_location; |
| 254 | |
| 255 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 256 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 257 | ERR("Invalid argument(s)"); |
| 258 | goto end; |
| 259 | } |
| 260 | |
| 261 | function_location = container_of(location, |
| 262 | struct lttng_userspace_probe_location_function, parent); |
| 263 | ret = function_location->binary_fd; |
| 264 | end: |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | static struct lttng_userspace_probe_location_lookup_method * |
| 269 | lttng_userspace_probe_location_function_get_lookup_method( |
| 270 | const struct lttng_userspace_probe_location *location) |
| 271 | { |
| 272 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 273 | |
| 274 | if (!location || lttng_userspace_probe_location_get_type(location) != |
| 275 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) { |
| 276 | ERR("Invalid argument(s)"); |
| 277 | goto end; |
| 278 | } |
| 279 | |
| 280 | ret = location->lookup_method; |
| 281 | end: |
| 282 | return ret; |
| 283 | } |
| 284 | |
| 285 | struct lttng_userspace_probe_location_lookup_method * |
| 286 | lttng_userspace_probe_location_get_lookup_method( |
| 287 | const struct lttng_userspace_probe_location *location) |
| 288 | { |
| 289 | struct lttng_userspace_probe_location_lookup_method *ret = NULL; |
| 290 | |
| 291 | assert(location); |
| 292 | switch (location->type) { |
| 293 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 294 | ret = lttng_userspace_probe_location_function_get_lookup_method( |
| 295 | location); |
| 296 | break; |
| 297 | default: |
| 298 | ERR("Unknowned lookup method."); |
| 299 | break; |
| 300 | } |
| 301 | return ret; |
| 302 | } |
| 303 | |
| 304 | static |
| 305 | int lttng_userspace_probe_location_lookup_method_serialize( |
| 306 | struct lttng_userspace_probe_location_lookup_method *method, |
| 307 | struct lttng_dynamic_buffer *buffer) |
| 308 | { |
| 309 | int ret; |
| 310 | struct lttng_userspace_probe_location_lookup_method_comm |
| 311 | lookup_method_comm; |
| 312 | |
| 313 | lookup_method_comm.type = (int8_t) (method ? method->type : |
| 314 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT); |
| 315 | if (buffer) { |
| 316 | ret = lttng_dynamic_buffer_append(buffer, &lookup_method_comm, |
| 317 | sizeof(lookup_method_comm)); |
| 318 | if (ret) { |
| 319 | goto end; |
| 320 | } |
| 321 | } |
| 322 | ret = sizeof(lookup_method_comm); |
| 323 | end: |
| 324 | return ret; |
| 325 | } |
| 326 | |
| 327 | static |
| 328 | int lttng_userspace_probe_location_function_serialize( |
| 329 | const struct lttng_userspace_probe_location *location, |
| 330 | struct lttng_dynamic_buffer *buffer, |
| 331 | int *binary_fd) |
| 332 | { |
| 333 | int ret; |
| 334 | size_t function_name_len, binary_path_len; |
| 335 | struct lttng_userspace_probe_location_function *location_function; |
| 336 | struct lttng_userspace_probe_location_function_comm location_function_comm; |
| 337 | |
| 338 | assert(location); |
| 339 | assert(lttng_userspace_probe_location_get_type(location) == |
| 340 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
| 341 | |
| 342 | location_function = container_of(location, |
| 343 | struct lttng_userspace_probe_location_function, |
| 344 | parent); |
| 345 | if (!location_function->function_name || !location_function->binary_path) { |
| 346 | ret = -LTTNG_ERR_INVALID; |
| 347 | goto end; |
| 348 | } |
| 349 | |
| 350 | if (binary_fd && location_function->binary_fd < 0) { |
| 351 | ret = -LTTNG_ERR_INVALID; |
| 352 | goto end; |
| 353 | } |
| 354 | |
| 355 | if (binary_fd) { |
| 356 | *binary_fd = location_function->binary_fd; |
| 357 | } |
| 358 | |
| 359 | function_name_len = strlen(location_function->function_name); |
| 360 | if (function_name_len == 0) { |
| 361 | ret = -LTTNG_ERR_INVALID; |
| 362 | goto end; |
| 363 | } |
| 364 | binary_path_len = strlen(location_function->binary_path); |
| 365 | if (binary_path_len == 0) { |
| 366 | ret = -LTTNG_ERR_INVALID; |
| 367 | goto end; |
| 368 | } |
| 369 | |
| 370 | location_function_comm.function_name_len = function_name_len + 1; |
| 371 | location_function_comm.binary_path_len = binary_path_len + 1; |
| 372 | |
| 373 | if (buffer) { |
| 374 | ret = lttng_dynamic_buffer_append(buffer, |
| 375 | &location_function_comm, |
| 376 | sizeof(location_function_comm)); |
| 377 | if (ret) { |
| 378 | ret = -LTTNG_ERR_INVALID; |
| 379 | goto end; |
| 380 | } |
| 381 | ret = lttng_dynamic_buffer_append(buffer, |
| 382 | location_function->function_name, |
| 383 | location_function_comm.function_name_len); |
| 384 | if (ret) { |
| 385 | ret = -LTTNG_ERR_INVALID; |
| 386 | goto end; |
| 387 | } |
| 388 | ret = lttng_dynamic_buffer_append(buffer, |
| 389 | location_function->binary_path, |
| 390 | location_function_comm.binary_path_len); |
| 391 | if (ret) { |
| 392 | ret = -LTTNG_ERR_INVALID; |
| 393 | goto end; |
| 394 | } |
| 395 | } |
| 396 | ret = sizeof(location_function_comm) + |
| 397 | location_function_comm.function_name_len + |
| 398 | location_function_comm.binary_path_len; |
| 399 | end: |
| 400 | return ret; |
| 401 | } |
| 402 | |
| 403 | LTTNG_HIDDEN |
| 404 | int lttng_userspace_probe_location_serialize( |
| 405 | const struct lttng_userspace_probe_location *location, |
| 406 | struct lttng_dynamic_buffer *buffer, |
| 407 | int *binary_fd) |
| 408 | { |
| 409 | int ret, buffer_use = 0; |
| 410 | struct lttng_userspace_probe_location_comm location_generic_comm; |
| 411 | |
| 412 | if (!location) { |
| 413 | ERR("Invalid argument(s)"); |
| 414 | ret = -LTTNG_ERR_INVALID; |
| 415 | goto end; |
| 416 | } |
| 417 | |
| 418 | memset(&location_generic_comm, 0, sizeof(location_generic_comm)); |
| 419 | |
| 420 | location_generic_comm.type = (int8_t) location->type; |
| 421 | if (buffer) { |
| 422 | ret = lttng_dynamic_buffer_append(buffer, &location_generic_comm, |
| 423 | sizeof(location_generic_comm)); |
| 424 | if (ret) { |
| 425 | goto end; |
| 426 | } |
| 427 | } |
| 428 | buffer_use += sizeof(location_generic_comm); |
| 429 | |
| 430 | switch (lttng_userspace_probe_location_get_type(location)) { |
| 431 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 432 | ret = lttng_userspace_probe_location_function_serialize( |
| 433 | location, buffer, binary_fd); |
| 434 | break; |
| 435 | default: |
| 436 | ERR("Unsupported probe location type"); |
| 437 | ret = -LTTNG_ERR_INVALID; |
| 438 | goto end; |
| 439 | } |
| 440 | if (ret < 0) { |
| 441 | goto end; |
| 442 | } |
| 443 | buffer_use += ret; |
| 444 | |
| 445 | ret = lttng_userspace_probe_location_lookup_method_serialize( |
| 446 | location->lookup_method, buffer); |
| 447 | if (ret < 0) { |
| 448 | goto end; |
| 449 | } |
| 450 | ret += buffer_use; |
| 451 | end: |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | static |
| 456 | int lttng_userspace_probe_location_function_create_from_buffer( |
| 457 | const struct lttng_buffer_view *buffer, |
| 458 | struct lttng_userspace_probe_location **location) |
| 459 | { |
| 460 | struct lttng_userspace_probe_location_function_comm *location_function_comm; |
| 461 | const char *function_name_src, *binary_path_src; |
| 462 | char *function_name = NULL, *binary_path = NULL; |
| 463 | int ret = 0; |
| 464 | |
| 465 | assert(buffer); |
| 466 | assert(buffer->data); |
| 467 | assert(location); |
| 468 | |
| 469 | location_function_comm = |
| 470 | (struct lttng_userspace_probe_location_function_comm *) buffer->data; |
| 471 | |
| 472 | const size_t expected_size = sizeof(*location_function_comm) + |
| 473 | location_function_comm->function_name_len + |
| 474 | location_function_comm->binary_path_len; |
| 475 | |
| 476 | if (buffer->size < expected_size) { |
| 477 | ret = -LTTNG_ERR_INVALID; |
| 478 | goto end; |
| 479 | } |
| 480 | |
| 481 | function_name_src = buffer->data + sizeof(*location_function_comm); |
| 482 | binary_path_src = function_name_src + |
| 483 | location_function_comm->function_name_len; |
| 484 | |
| 485 | if (function_name_src[location_function_comm->function_name_len - 1] != '\0') { |
| 486 | ret = -LTTNG_ERR_INVALID; |
| 487 | goto end; |
| 488 | } |
| 489 | if (binary_path_src[location_function_comm->binary_path_len - 1] != '\0') { |
| 490 | ret = -LTTNG_ERR_INVALID; |
| 491 | goto end; |
| 492 | } |
| 493 | |
| 494 | function_name = lttng_strndup(function_name_src, LTTNG_SYMBOL_NAME_LEN); |
| 495 | if (!function_name) { |
| 496 | PERROR("lttng_strndup"); |
| 497 | goto end; |
| 498 | } |
| 499 | |
| 500 | binary_path = lttng_strndup(binary_path_src, LTTNG_PATH_MAX); |
| 501 | if (!binary_path) { |
| 502 | PERROR("lttng_strndup"); |
| 503 | goto end; |
| 504 | } |
| 505 | |
| 506 | *location = lttng_userspace_probe_location_function_create_no_check( |
| 507 | binary_path, function_name, NULL, false); |
| 508 | if (!(*location)) { |
| 509 | ret = -LTTNG_ERR_INVALID; |
| 510 | goto end; |
| 511 | } |
| 512 | |
| 513 | ret = (int) expected_size; |
| 514 | end: |
| 515 | free(function_name); |
| 516 | free(binary_path); |
| 517 | return ret; |
| 518 | } |
| 519 | |
| 520 | static |
| 521 | int lttng_userspace_probe_location_lookup_method_create_from_buffer( |
| 522 | struct lttng_buffer_view *buffer, |
| 523 | struct lttng_userspace_probe_location_lookup_method **lookup_method) |
| 524 | { |
| 525 | int ret; |
| 526 | struct lttng_userspace_probe_location_lookup_method_comm *lookup_comm; |
| 527 | enum lttng_userspace_probe_location_lookup_method_type type; |
| 528 | |
| 529 | assert(buffer); |
| 530 | assert(buffer->data); |
| 531 | assert(lookup_method); |
| 532 | |
| 533 | if (buffer->size < sizeof(*lookup_comm)) { |
| 534 | ret = -LTTNG_ERR_INVALID; |
| 535 | goto end; |
| 536 | } |
| 537 | |
| 538 | lookup_comm = (struct lttng_userspace_probe_location_lookup_method_comm *) |
| 539 | buffer->data; |
| 540 | type = (enum lttng_userspace_probe_location_lookup_method_type) |
| 541 | lookup_comm->type; |
| 542 | switch (type) { |
| 543 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT: |
| 544 | *lookup_method = NULL; |
| 545 | break; |
| 546 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 547 | *lookup_method = |
| 548 | lttng_userspace_probe_location_lookup_method_function_elf_create(); |
| 549 | if (!(*lookup_method)) { |
| 550 | ret = -LTTNG_ERR_INVALID; |
| 551 | goto end; |
| 552 | } |
| 553 | break; |
| 554 | default: |
| 555 | ret = -LTTNG_ERR_INVALID; |
| 556 | goto end; |
| 557 | } |
| 558 | |
| 559 | ret = sizeof(*lookup_comm); |
| 560 | end: |
| 561 | return ret; |
| 562 | } |
| 563 | |
| 564 | LTTNG_HIDDEN |
| 565 | int lttng_userspace_probe_location_create_from_buffer( |
| 566 | const struct lttng_buffer_view *buffer, |
| 567 | struct lttng_userspace_probe_location **location) |
| 568 | { |
| 569 | struct lttng_userspace_probe_location_lookup_method *lookup_method; |
| 570 | struct lttng_userspace_probe_location_comm *probe_location_comm; |
| 571 | enum lttng_userspace_probe_location_type type; |
| 572 | struct lttng_buffer_view lookup_method_view; |
| 573 | int consumed = 0; |
| 574 | int ret; |
| 575 | |
| 576 | |
| 577 | assert(buffer); |
| 578 | assert(buffer->data); |
| 579 | assert(location); |
| 580 | |
| 581 | lookup_method = NULL; |
| 582 | |
| 583 | if (buffer->size <= sizeof(*probe_location_comm)) { |
| 584 | ret = -LTTNG_ERR_INVALID; |
| 585 | goto end; |
| 586 | } |
| 587 | |
| 588 | probe_location_comm = |
| 589 | (struct lttng_userspace_probe_location_comm *) buffer->data; |
| 590 | type = (enum lttng_userspace_probe_location_type) probe_location_comm->type; |
| 591 | consumed += sizeof(*probe_location_comm); |
| 592 | |
| 593 | switch (type) { |
| 594 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 595 | { |
| 596 | struct lttng_buffer_view view = lttng_buffer_view_from_view( |
| 597 | buffer, consumed, buffer->size - consumed); |
| 598 | |
| 599 | ret = lttng_userspace_probe_location_function_create_from_buffer( |
| 600 | &view, location); |
| 601 | if (ret < 0) { |
| 602 | goto end; |
| 603 | } |
| 604 | break; |
| 605 | } |
| 606 | default: |
| 607 | ret = -LTTNG_ERR_INVALID; |
| 608 | goto end; |
| 609 | } |
| 610 | |
| 611 | consumed += ret; |
| 612 | if (buffer->size <= consumed) { |
| 613 | ret = -LTTNG_ERR_INVALID; |
| 614 | goto end; |
| 615 | } |
| 616 | |
| 617 | lookup_method_view = lttng_buffer_view_from_view(buffer, consumed, |
| 618 | buffer->size - consumed); |
| 619 | ret = lttng_userspace_probe_location_lookup_method_create_from_buffer( |
| 620 | &lookup_method_view, &lookup_method); |
| 621 | if (ret < 0) { |
| 622 | ret = -LTTNG_ERR_INVALID; |
| 623 | goto end; |
| 624 | } |
| 625 | |
| 626 | assert(lookup_method); |
| 627 | (*location)->lookup_method = lookup_method; |
| 628 | lookup_method = NULL; |
| 629 | ret += consumed; |
| 630 | end: |
| 631 | return ret; |
| 632 | } |
| 633 | |
| 634 | LTTNG_HIDDEN |
| 635 | int lttng_userspace_probe_location_function_set_binary_fd( |
| 636 | struct lttng_userspace_probe_location *location, int binary_fd) |
| 637 | { |
| 638 | int ret = 0; |
| 639 | struct lttng_userspace_probe_location_function *function_location; |
| 640 | |
| 641 | assert(location); |
| 642 | assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
| 643 | |
| 644 | function_location = container_of(location, |
| 645 | struct lttng_userspace_probe_location_function, parent); |
| 646 | if (function_location->binary_fd >= 0) { |
| 647 | ret = close(function_location->binary_fd); |
| 648 | if (ret) { |
| 649 | PERROR("close"); |
| 650 | ret = -LTTNG_ERR_INVALID; |
| 651 | goto end; |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | function_location->binary_fd = binary_fd; |
| 656 | end: |
| 657 | return ret; |
| 658 | } |
| 659 | |
| 660 | static |
| 661 | int lttng_userspace_probe_location_function_flatten( |
| 662 | const struct lttng_userspace_probe_location *location, |
| 663 | struct lttng_dynamic_buffer *buffer) |
| 664 | { |
| 665 | struct lttng_userspace_probe_location_lookup_method_elf flat_lookup_method; |
| 666 | struct lttng_userspace_probe_location_function *probe_function; |
| 667 | struct lttng_userspace_probe_location_function flat_probe; |
| 668 | size_t function_name_len, binary_path_len; |
| 669 | size_t padding_needed = 0; |
| 670 | char *flat_probe_start; |
| 671 | int storage_needed = 0; |
| 672 | int ret; |
| 673 | |
| 674 | assert(location); |
| 675 | |
| 676 | if (location->lookup_method && location->lookup_method->type != |
| 677 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF) { |
| 678 | ret = -LTTNG_ERR_INVALID; |
| 679 | goto end; |
| 680 | } |
| 681 | |
| 682 | probe_function = container_of(location, |
| 683 | struct lttng_userspace_probe_location_function, |
| 684 | parent); |
| 685 | assert(probe_function->function_name); |
| 686 | assert(probe_function->binary_path); |
| 687 | |
| 688 | storage_needed += |
| 689 | sizeof(struct lttng_userspace_probe_location_function); |
| 690 | function_name_len = strlen(probe_function->function_name) + 1; |
| 691 | binary_path_len = strlen(probe_function->binary_path) + 1; |
| 692 | storage_needed += function_name_len + binary_path_len; |
| 693 | |
| 694 | /* |
| 695 | * The lookup method is aligned to 64-bit within the buffer. |
| 696 | * This is needed even if there is no lookup method since |
| 697 | * the next structure in the buffer probably needs to be |
| 698 | * aligned too (depending on the arch). |
| 699 | */ |
| 700 | padding_needed = ALIGN_TO(storage_needed, sizeof(uint64_t)) - storage_needed; |
| 701 | storage_needed += padding_needed; |
| 702 | |
| 703 | if (location->lookup_method) { |
| 704 | /* NOTE: elf look-up method is assumed here. */ |
| 705 | storage_needed += sizeof(struct lttng_userspace_probe_location_lookup_method_elf); |
| 706 | } |
| 707 | |
| 708 | if (!buffer) { |
| 709 | ret = storage_needed; |
| 710 | goto end; |
| 711 | } |
| 712 | |
| 713 | if (lttng_dynamic_buffer_get_capacity_left(buffer) < storage_needed) { |
| 714 | ret = lttng_dynamic_buffer_set_capacity(buffer, |
| 715 | buffer->size + storage_needed); |
| 716 | if (ret) { |
| 717 | goto end; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | memset(&flat_probe, 0, sizeof(flat_probe)); |
| 722 | |
| 723 | flat_probe_start = buffer->data + buffer->size; |
| 724 | flat_probe.parent.type = location->type; |
| 725 | /* |
| 726 | * The lookup method, if present, is the last element in the flat |
| 727 | * representation of the probe. |
| 728 | */ |
| 729 | if (location->lookup_method) { |
| 730 | flat_probe.parent.lookup_method = |
| 731 | (struct lttng_userspace_probe_location_lookup_method *) |
| 732 | (flat_probe_start + sizeof(flat_probe) + |
| 733 | function_name_len + binary_path_len + padding_needed); |
| 734 | } else { |
| 735 | flat_probe.parent.lookup_method = NULL; |
| 736 | } |
| 737 | |
| 738 | flat_probe.function_name = flat_probe_start + sizeof(flat_probe); |
| 739 | flat_probe.binary_path = flat_probe.function_name + function_name_len; |
| 740 | flat_probe.binary_fd = -1; |
| 741 | ret = lttng_dynamic_buffer_append(buffer, &flat_probe, |
| 742 | sizeof(flat_probe)); |
| 743 | if (ret) { |
| 744 | goto end; |
| 745 | } |
| 746 | |
| 747 | ret = lttng_dynamic_buffer_append(buffer, |
| 748 | probe_function->function_name, function_name_len); |
| 749 | if (ret) { |
| 750 | goto end; |
| 751 | } |
| 752 | ret = lttng_dynamic_buffer_append(buffer, |
| 753 | probe_function->binary_path, binary_path_len); |
| 754 | if (ret) { |
| 755 | goto end; |
| 756 | } |
| 757 | |
| 758 | /* Insert padding before the lookup method. */ |
| 759 | ret = lttng_dynamic_buffer_set_size(buffer, |
| 760 | buffer->size + padding_needed); |
| 761 | if (ret) { |
| 762 | goto end; |
| 763 | } |
| 764 | |
| 765 | if (!location->lookup_method) { |
| 766 | /* Not an error, the default method is used. */ |
| 767 | ret = storage_needed; |
| 768 | goto end; |
| 769 | } |
| 770 | |
| 771 | memset(&flat_lookup_method, 0, sizeof(flat_lookup_method)); |
| 772 | flat_lookup_method.parent.type = |
| 773 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF; |
| 774 | ret = lttng_dynamic_buffer_append(buffer, |
| 775 | &flat_lookup_method, sizeof(flat_lookup_method)); |
| 776 | if (ret) { |
| 777 | goto end; |
| 778 | } |
| 779 | ret = storage_needed; |
| 780 | end: |
| 781 | return ret; |
| 782 | } |
| 783 | |
| 784 | LTTNG_HIDDEN |
| 785 | int lttng_userspace_probe_location_flatten( |
| 786 | const struct lttng_userspace_probe_location *location, |
| 787 | struct lttng_dynamic_buffer *buffer) |
| 788 | { |
| 789 | int ret; |
| 790 | if (!location) { |
| 791 | ret = -LTTNG_ERR_INVALID; |
| 792 | goto end; |
| 793 | } |
| 794 | |
| 795 | /* Only types currently supported. */ |
| 796 | switch (location->type) { |
| 797 | case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION: |
| 798 | ret = lttng_userspace_probe_location_function_flatten(location, buffer); |
| 799 | break; |
| 800 | default: |
| 801 | ret = -LTTNG_ERR_INVALID; |
| 802 | goto end; |
| 803 | } |
| 804 | |
| 805 | end: |
| 806 | return ret; |
| 807 | } |