| 1 | /* |
| 2 | * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <common/compat/fcntl.hpp> |
| 9 | #include <common/defaults.hpp> |
| 10 | #include <common/error.hpp> |
| 11 | #include <common/payload-view.hpp> |
| 12 | #include <common/payload.hpp> |
| 13 | #include <common/sessiond-comm/sessiond-comm.hpp> |
| 14 | #include <common/unix.hpp> |
| 15 | #include <common/utils.hpp> |
| 16 | |
| 17 | #include <lttng/constant.h> |
| 18 | |
| 19 | #include <algorithm> |
| 20 | #include <pthread.h> |
| 21 | #include <stdbool.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <sys/wait.h> |
| 25 | #include <tap/tap.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #define HIGH_FD_COUNT LTTCOMM_MAX_SEND_FDS |
| 29 | #define MESSAGE_COUNT 4 |
| 30 | #define LARGE_PAYLOAD_SIZE (4 * 1024) |
| 31 | #define LARGE_PAYLOAD_RECV_SIZE 100 |
| 32 | |
| 33 | static const int TEST_COUNT = 37; |
| 34 | |
| 35 | /* For error.h */ |
| 36 | int lttng_opt_quiet; |
| 37 | int lttng_opt_verbose; |
| 38 | int lttng_opt_mi; |
| 39 | |
| 40 | /* |
| 41 | * Validate that a large number of file descriptors can be received in one shot. |
| 42 | */ |
| 43 | static void test_high_fd_count(unsigned int fd_count) |
| 44 | { |
| 45 | int sockets[2] = { -1, -1 }; |
| 46 | int ret; |
| 47 | unsigned int i; |
| 48 | const unsigned int payload_content = 42; |
| 49 | struct lttng_payload sent_payload; |
| 50 | struct lttng_payload received_payload; |
| 51 | |
| 52 | diag("Send and receive high FD count atomically (%u FDs)", fd_count); |
| 53 | lttng_payload_init(&sent_payload); |
| 54 | lttng_payload_init(&received_payload); |
| 55 | |
| 56 | ret = lttcomm_create_anon_unix_socketpair(sockets); |
| 57 | ok(ret == 0, "Created anonymous unix socket pair"); |
| 58 | if (ret < 0) { |
| 59 | PERROR("Failed to create an anonymous pair of unix sockets"); |
| 60 | goto error; |
| 61 | } |
| 62 | |
| 63 | /* Add dummy content to payload. */ |
| 64 | ret = lttng_dynamic_buffer_append( |
| 65 | &sent_payload.buffer, &payload_content, sizeof(payload_content)); |
| 66 | if (ret) { |
| 67 | PERROR("Failed to initialize test payload"); |
| 68 | goto error; |
| 69 | } |
| 70 | |
| 71 | for (i = 0; i < fd_count; i++) { |
| 72 | struct fd_handle *handle; |
| 73 | int fd = fcntl(STDOUT_FILENO, F_DUPFD, 0); |
| 74 | |
| 75 | if (fd < 0) { |
| 76 | PERROR("Failed to create fd while creating test payload"); |
| 77 | goto error; |
| 78 | } |
| 79 | |
| 80 | handle = fd_handle_create(fd); |
| 81 | if (!handle) { |
| 82 | if (close(fd)) { |
| 83 | PERROR("Failed to close fd while preparing test payload"); |
| 84 | goto error; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | ret = lttng_payload_push_fd_handle(&sent_payload, handle); |
| 89 | fd_handle_put(handle); |
| 90 | if (ret) { |
| 91 | PERROR("Failed to add fd handle to test payload"); |
| 92 | goto error; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | /* Send payload. */ |
| 97 | { |
| 98 | ssize_t sock_ret; |
| 99 | struct lttng_payload_view pv = |
| 100 | lttng_payload_view_from_payload(&sent_payload, 0, -1); |
| 101 | |
| 102 | /* Not expected to block considering the size of the payload. */ |
| 103 | sock_ret = lttcomm_send_unix_sock(sockets[0], pv.buffer.data, pv.buffer.size); |
| 104 | ok(sock_ret == pv.buffer.size, "Sent complete test payload"); |
| 105 | if (sock_ret != pv.buffer.size) { |
| 106 | ERR("Failed to send test payload bytes: ret = %zd, expected = %zu", |
| 107 | sock_ret, |
| 108 | pv.buffer.size); |
| 109 | goto error; |
| 110 | } |
| 111 | |
| 112 | sock_ret = lttcomm_send_payload_view_fds_unix_sock(sockets[0], &pv); |
| 113 | ok(sock_ret == 1, "Sent test payload file descriptors"); |
| 114 | if (sock_ret != 1) { |
| 115 | if (sock_ret < 0) { |
| 116 | PERROR("Failed to send test payload file descriptors: ret = %zd, expected = %d", |
| 117 | sock_ret, |
| 118 | 1); |
| 119 | } else { |
| 120 | diag("Failed to send test payload file descriptors: ret = %zd, expected = %d", |
| 121 | sock_ret, |
| 122 | 1); |
| 123 | } |
| 124 | |
| 125 | goto error; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | /* Receive payload */ |
| 130 | { |
| 131 | ssize_t sock_ret; |
| 132 | |
| 133 | ret = lttng_dynamic_buffer_set_size(&received_payload.buffer, |
| 134 | sent_payload.buffer.size); |
| 135 | if (ret) { |
| 136 | PERROR("Failed to pre-allocate reception buffer"); |
| 137 | goto error; |
| 138 | } |
| 139 | |
| 140 | sock_ret = lttcomm_recv_unix_sock( |
| 141 | sockets[1], received_payload.buffer.data, received_payload.buffer.size); |
| 142 | ok(sock_ret == received_payload.buffer.size, "Received payload bytes"); |
| 143 | if (sock_ret != received_payload.buffer.size) { |
| 144 | ERR("Failed to receive payload bytes: ret = %zd, expected = %zu", |
| 145 | sock_ret, |
| 146 | received_payload.buffer.size); |
| 147 | goto error; |
| 148 | } |
| 149 | |
| 150 | sock_ret = |
| 151 | lttcomm_recv_payload_fds_unix_sock(sockets[1], fd_count, &received_payload); |
| 152 | ok(sock_ret == (int) (sizeof(int) * fd_count), |
| 153 | "FD reception return value is number of fd * sizeof(int)"); |
| 154 | if (sock_ret != (int) (sizeof(int) * fd_count)) { |
| 155 | ERR("Failed to receive test payload file descriptors: ret = %zd, expected = %d", |
| 156 | sock_ret, |
| 157 | (int) (fd_count * sizeof(int))); |
| 158 | goto error; |
| 159 | } |
| 160 | |
| 161 | { |
| 162 | const struct lttng_payload_view pv = |
| 163 | lttng_payload_view_from_payload(&received_payload, 0, -1); |
| 164 | const int fd_handle_count = lttng_payload_view_get_fd_handle_count(&pv); |
| 165 | |
| 166 | ok(fd_handle_count == fd_count, |
| 167 | "Received all test payload file descriptors in one invocation"); |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | error: |
| 172 | for (i = 0; i < 2; i++) { |
| 173 | if (sockets[i] < 0) { |
| 174 | continue; |
| 175 | } |
| 176 | |
| 177 | if (close(sockets[i])) { |
| 178 | PERROR("Failed to close unix socket"); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | lttng_payload_reset(&sent_payload); |
| 183 | lttng_payload_reset(&received_payload); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Validate that if the sender sent multiple messages, each containing 1 fd, |
| 188 | * the receiver can receive one message at a time (the binary payload and its |
| 189 | * fd) and is not forced to receive all file descriptors at once. |
| 190 | */ |
| 191 | static void test_one_fd_per_message(unsigned int message_count) |
| 192 | { |
| 193 | const unsigned int payload_content = 42; |
| 194 | int sockets[2] = { -1, -1 }; |
| 195 | int ret; |
| 196 | unsigned int i; |
| 197 | struct lttng_payload sent_payload; |
| 198 | struct lttng_payload received_payload; |
| 199 | |
| 200 | diag("Send and receive small messages with one FD each (%u messages)", message_count); |
| 201 | lttng_payload_init(&sent_payload); |
| 202 | lttng_payload_init(&received_payload); |
| 203 | |
| 204 | ret = lttcomm_create_anon_unix_socketpair(sockets); |
| 205 | ok(ret == 0, "Created anonymous unix socket pair"); |
| 206 | if (ret < 0) { |
| 207 | PERROR("Failed to create an anonymous pair of unix sockets"); |
| 208 | goto error; |
| 209 | } |
| 210 | |
| 211 | /* Send messages with one fd each. */ |
| 212 | for (i = 0; i < message_count; i++) { |
| 213 | struct fd_handle *handle; |
| 214 | int fd; |
| 215 | |
| 216 | /* Add dummy content to payload. */ |
| 217 | ret = lttng_dynamic_buffer_append( |
| 218 | &sent_payload.buffer, &payload_content, sizeof(payload_content)); |
| 219 | if (ret) { |
| 220 | PERROR("Failed to initialize test payload"); |
| 221 | goto error; |
| 222 | } |
| 223 | |
| 224 | fd = fcntl(STDOUT_FILENO, F_DUPFD, 0); |
| 225 | if (fd < 0) { |
| 226 | PERROR("Failed to create fd while creating test payload"); |
| 227 | goto error; |
| 228 | } |
| 229 | |
| 230 | handle = fd_handle_create(fd); |
| 231 | if (!handle) { |
| 232 | if (close(fd)) { |
| 233 | PERROR("Failed to close fd while preparing test payload"); |
| 234 | goto error; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | ret = lttng_payload_push_fd_handle(&sent_payload, handle); |
| 239 | fd_handle_put(handle); |
| 240 | if (ret) { |
| 241 | PERROR("Failed to add fd handle to test payload"); |
| 242 | goto error; |
| 243 | } |
| 244 | |
| 245 | /* Send payload. */ |
| 246 | { |
| 247 | ssize_t sock_ret; |
| 248 | struct lttng_payload_view pv = |
| 249 | lttng_payload_view_from_payload(&sent_payload, 0, -1); |
| 250 | |
| 251 | /* Not expected to block considering the size of the |
| 252 | * payload. */ |
| 253 | sock_ret = |
| 254 | lttcomm_send_unix_sock(sockets[0], pv.buffer.data, pv.buffer.size); |
| 255 | ok(sock_ret == pv.buffer.size, "Sent binary payload for message %u", i); |
| 256 | if (sock_ret != pv.buffer.size) { |
| 257 | ERR("Failed to send test payload bytes: ret = %zd, expected = %zu", |
| 258 | sock_ret, |
| 259 | pv.buffer.size); |
| 260 | goto error; |
| 261 | } |
| 262 | |
| 263 | sock_ret = lttcomm_send_payload_view_fds_unix_sock(sockets[0], &pv); |
| 264 | ok(sock_ret == 1, "Sent file descriptors payload for message %u", i); |
| 265 | if (sock_ret != 1) { |
| 266 | if (sock_ret < 0) { |
| 267 | PERROR("Failed to send test payload file descriptors: ret = %zd, expected = %d", |
| 268 | sock_ret, |
| 269 | 1); |
| 270 | } else { |
| 271 | diag("Failed to send test payload file descriptors: ret = %zd, expected = %d", |
| 272 | sock_ret, |
| 273 | 1); |
| 274 | } |
| 275 | |
| 276 | goto error; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | lttng_payload_clear(&sent_payload); |
| 281 | } |
| 282 | |
| 283 | /* Receive messages one at a time. */ |
| 284 | for (i = 0; i < message_count; i++) { |
| 285 | ssize_t sock_ret; |
| 286 | |
| 287 | ret = lttng_dynamic_buffer_set_size(&received_payload.buffer, |
| 288 | sizeof(payload_content)); |
| 289 | if (ret) { |
| 290 | PERROR("Failed to pre-allocate reception buffer"); |
| 291 | goto error; |
| 292 | } |
| 293 | |
| 294 | sock_ret = lttcomm_recv_unix_sock( |
| 295 | sockets[1], received_payload.buffer.data, received_payload.buffer.size); |
| 296 | ok(sock_ret == received_payload.buffer.size, |
| 297 | "Received payload bytes for message %u", |
| 298 | i); |
| 299 | if (sock_ret != received_payload.buffer.size) { |
| 300 | ERR("Failed to receive payload bytes: ret = %zd, expected = %zu", |
| 301 | sock_ret, |
| 302 | received_payload.buffer.size); |
| 303 | goto error; |
| 304 | } |
| 305 | |
| 306 | sock_ret = lttcomm_recv_payload_fds_unix_sock(sockets[1], 1, &received_payload); |
| 307 | ok(sock_ret == (int) sizeof(int), "Received fd for message %u", i); |
| 308 | if (sock_ret != (int) sizeof(int)) { |
| 309 | ERR("Failed to receive test payload file descriptors: ret = %zd, expected = %u", |
| 310 | sock_ret, |
| 311 | (int) sizeof(int)); |
| 312 | goto error; |
| 313 | } |
| 314 | |
| 315 | { |
| 316 | const struct lttng_payload_view pv = |
| 317 | lttng_payload_view_from_payload(&received_payload, 0, -1); |
| 318 | const int fd_handle_count = lttng_payload_view_get_fd_handle_count(&pv); |
| 319 | |
| 320 | ok(fd_handle_count == 1, "Payload contains 1 fd for message %u", i); |
| 321 | } |
| 322 | |
| 323 | lttng_payload_clear(&received_payload); |
| 324 | } |
| 325 | |
| 326 | error: |
| 327 | for (i = 0; i < 2; i++) { |
| 328 | if (sockets[i] < 0) { |
| 329 | continue; |
| 330 | } |
| 331 | |
| 332 | if (close(sockets[i])) { |
| 333 | PERROR("Failed to close unix socket"); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | lttng_payload_reset(&sent_payload); |
| 338 | lttng_payload_reset(&received_payload); |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Validate that a large message can be received in multiple chunks. |
| 343 | */ |
| 344 | static void test_receive_in_chunks(unsigned int payload_size, unsigned int max_recv_size) |
| 345 | { |
| 346 | int sockets[2] = { -1, -1 }; |
| 347 | int ret; |
| 348 | unsigned int i; |
| 349 | struct lttng_payload sent_payload; |
| 350 | struct lttng_payload received_payload; |
| 351 | struct fd_handle *handle; |
| 352 | int fd; |
| 353 | ssize_t sock_ret, received = 0; |
| 354 | |
| 355 | diag("Receive a message in multiple chunks"); |
| 356 | lttng_payload_init(&sent_payload); |
| 357 | lttng_payload_init(&received_payload); |
| 358 | |
| 359 | ret = lttcomm_create_anon_unix_socketpair(sockets); |
| 360 | ok(ret == 0, "Created anonymous unix socket pair"); |
| 361 | if (ret < 0) { |
| 362 | PERROR("Failed to create an anonymous pair of unix sockets"); |
| 363 | goto error; |
| 364 | } |
| 365 | |
| 366 | /* Add dummy content to payload. */ |
| 367 | ret = lttng_dynamic_buffer_set_size(&sent_payload.buffer, payload_size); |
| 368 | if (ret) { |
| 369 | PERROR("Failed to initialize test payload"); |
| 370 | goto error; |
| 371 | } |
| 372 | |
| 373 | fd = fcntl(STDOUT_FILENO, F_DUPFD, 0); |
| 374 | if (fd < 0) { |
| 375 | PERROR("Failed to create fd while creating test payload"); |
| 376 | goto error; |
| 377 | } |
| 378 | |
| 379 | handle = fd_handle_create(fd); |
| 380 | if (!handle) { |
| 381 | if (close(fd)) { |
| 382 | PERROR("Failed to close fd while preparing test payload"); |
| 383 | goto error; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | ret = lttng_payload_push_fd_handle(&sent_payload, handle); |
| 388 | fd_handle_put(handle); |
| 389 | if (ret) { |
| 390 | PERROR("Failed to add fd handle to test payload"); |
| 391 | goto error; |
| 392 | } |
| 393 | |
| 394 | /* Send payload. */ |
| 395 | { |
| 396 | struct lttng_payload_view pv = |
| 397 | lttng_payload_view_from_payload(&sent_payload, 0, -1); |
| 398 | |
| 399 | /* Not expected to block considering the size of the payload. */ |
| 400 | sock_ret = lttcomm_send_unix_sock(sockets[0], pv.buffer.data, pv.buffer.size); |
| 401 | ok(sock_ret == pv.buffer.size, "Sent complete test payload"); |
| 402 | if (sock_ret != pv.buffer.size) { |
| 403 | ERR("Failed to send test payload bytes: ret = %zd, expected = %zu", |
| 404 | sock_ret, |
| 405 | pv.buffer.size); |
| 406 | goto error; |
| 407 | } |
| 408 | |
| 409 | sock_ret = lttcomm_send_payload_view_fds_unix_sock(sockets[0], &pv); |
| 410 | ok(sock_ret == 1, "Sent test payload file descriptors"); |
| 411 | if (sock_ret != 1) { |
| 412 | if (sock_ret < 0) { |
| 413 | PERROR("Failed to send test payload file descriptors: ret = %zd, expected = %d", |
| 414 | sock_ret, |
| 415 | 1); |
| 416 | } else { |
| 417 | diag("Failed to send test payload file descriptors: ret = %zd, expected = %d", |
| 418 | sock_ret, |
| 419 | 1); |
| 420 | } |
| 421 | |
| 422 | goto error; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /* Receive payload */ |
| 427 | ret = lttng_dynamic_buffer_set_size(&received_payload.buffer, sent_payload.buffer.size); |
| 428 | if (ret) { |
| 429 | PERROR("Failed to pre-allocate reception buffer"); |
| 430 | goto error; |
| 431 | } |
| 432 | |
| 433 | do { |
| 434 | const ssize_t to_receive_this_pass = |
| 435 | std::min<ssize_t>(max_recv_size, sent_payload.buffer.size - received); |
| 436 | |
| 437 | sock_ret = lttcomm_recv_unix_sock( |
| 438 | sockets[1], received_payload.buffer.data + received, to_receive_this_pass); |
| 439 | if (sock_ret != to_receive_this_pass) { |
| 440 | ERR("Failed to receive payload bytes: ret = %zd, expected = %zu", |
| 441 | sock_ret, |
| 442 | to_receive_this_pass); |
| 443 | break; |
| 444 | } |
| 445 | |
| 446 | received += sock_ret; |
| 447 | } while (received < sent_payload.buffer.size); |
| 448 | |
| 449 | ok(received == sent_payload.buffer.size, |
| 450 | "Received complete payload in chunks of %u bytes", |
| 451 | max_recv_size); |
| 452 | if (received != sent_payload.buffer.size) { |
| 453 | goto error; |
| 454 | } |
| 455 | |
| 456 | sock_ret = lttcomm_recv_payload_fds_unix_sock(sockets[1], 1, &received_payload); |
| 457 | ok(sock_ret == (int) sizeof(int), |
| 458 | "Received file descriptor after receiving payload in chunks"); |
| 459 | if (sock_ret != (int) sizeof(int)) { |
| 460 | ERR("Failed to receive test payload file descriptors: ret = %zd, expected = %d", |
| 461 | sock_ret, |
| 462 | (int) sizeof(int)); |
| 463 | goto error; |
| 464 | } |
| 465 | |
| 466 | { |
| 467 | const struct lttng_payload_view pv = |
| 468 | lttng_payload_view_from_payload(&received_payload, 0, -1); |
| 469 | const int fd_handle_count = lttng_payload_view_get_fd_handle_count(&pv); |
| 470 | |
| 471 | ok(fd_handle_count == 1, "Payload contains 1 fd after receiving payload in chunks"); |
| 472 | } |
| 473 | |
| 474 | error: |
| 475 | for (i = 0; i < 2; i++) { |
| 476 | if (sockets[i] < 0) { |
| 477 | continue; |
| 478 | } |
| 479 | |
| 480 | if (close(sockets[i])) { |
| 481 | PERROR("Failed to close unix socket"); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | lttng_payload_reset(&sent_payload); |
| 486 | lttng_payload_reset(&received_payload); |
| 487 | } |
| 488 | |
| 489 | static void test_creds_passing() |
| 490 | { |
| 491 | pid_t fork_ret = -1; |
| 492 | int ret, parent_socket = -1, child_connection_socket = -1; |
| 493 | ssize_t sock_ret; |
| 494 | char socket_dir_path[] = "/tmp/test.unix.socket.creds.passing.XXXXXX"; |
| 495 | char socket_path[PATH_MAX] = {}; |
| 496 | struct expected_creds { |
| 497 | uid_t euid; |
| 498 | gid_t egid; |
| 499 | pid_t pid; |
| 500 | } expected_creds; |
| 501 | |
| 502 | diag("Receive peer's effective uid, effective gid, and pid from a unix socket"); |
| 503 | |
| 504 | if (!mkdtemp(socket_dir_path)) { |
| 505 | PERROR("Failed to generate temporary socket location"); |
| 506 | goto error; |
| 507 | } |
| 508 | |
| 509 | strncat(socket_path, socket_dir_path, sizeof(socket_path) - strlen(socket_path) - 1); |
| 510 | strncat(socket_path, "/test_unix_socket", sizeof(socket_path) - strlen(socket_path) - 1); |
| 511 | |
| 512 | parent_socket = lttcomm_create_unix_sock(socket_path); |
| 513 | ok(parent_socket >= 0, "Created unix socket at path `%s`", socket_path); |
| 514 | if (parent_socket < 0) { |
| 515 | PERROR("Failed to create unix socket at path `%s`", socket_path); |
| 516 | goto error; |
| 517 | } |
| 518 | |
| 519 | ret = lttcomm_listen_unix_sock(parent_socket); |
| 520 | if (ret < 0) { |
| 521 | PERROR("Failed to mark parent socket as a passive socket"); |
| 522 | goto error; |
| 523 | } |
| 524 | |
| 525 | ret = lttcomm_setsockopt_creds_unix_sock(parent_socket); |
| 526 | if (ret) { |
| 527 | PERROR("Failed to set SO_PASSCRED on parent socket"); |
| 528 | goto error; |
| 529 | } |
| 530 | |
| 531 | fork_ret = fork(); |
| 532 | if (fork_ret < 0) { |
| 533 | PERROR("Failed to fork"); |
| 534 | goto error; |
| 535 | } |
| 536 | |
| 537 | if (fork_ret == 0) { |
| 538 | /* Child. */ |
| 539 | int child_socket; |
| 540 | |
| 541 | expected_creds = (struct expected_creds){ |
| 542 | .euid = geteuid(), |
| 543 | .egid = getegid(), |
| 544 | .pid = getpid(), |
| 545 | }; |
| 546 | |
| 547 | child_socket = lttcomm_connect_unix_sock(socket_path); |
| 548 | if (child_socket < 0) { |
| 549 | PERROR("Failed to connect to parent socket"); |
| 550 | goto error; |
| 551 | } |
| 552 | |
| 553 | ret = lttcomm_setsockopt_creds_unix_sock(child_socket); |
| 554 | if (ret) { |
| 555 | PERROR("Failed to set SO_PASSCRED on child socket"); |
| 556 | } |
| 557 | |
| 558 | sock_ret = lttcomm_send_creds_unix_sock( |
| 559 | child_socket, &expected_creds, sizeof(expected_creds)); |
| 560 | if (sock_ret < 0) { |
| 561 | PERROR("Failed to send expected credentials"); |
| 562 | } |
| 563 | |
| 564 | ret = close(child_socket); |
| 565 | if (ret) { |
| 566 | PERROR("Failed to close child socket"); |
| 567 | } |
| 568 | } else { |
| 569 | /* Parent. */ |
| 570 | int child_status; |
| 571 | pid_t wait_pid_ret; |
| 572 | lttng_sock_cred received_creds = {}; |
| 573 | |
| 574 | child_connection_socket = lttcomm_accept_unix_sock(parent_socket); |
| 575 | if (child_connection_socket < 0) { |
| 576 | PERROR(); |
| 577 | goto error; |
| 578 | } |
| 579 | |
| 580 | ret = lttcomm_setsockopt_creds_unix_sock(child_connection_socket); |
| 581 | if (ret) { |
| 582 | PERROR("Failed to set SO_PASSCRED on child connection socket"); |
| 583 | goto error; |
| 584 | } |
| 585 | |
| 586 | sock_ret = lttcomm_recv_creds_unix_sock(child_connection_socket, |
| 587 | &expected_creds, |
| 588 | sizeof(expected_creds), |
| 589 | &received_creds); |
| 590 | if (sock_ret < 0) { |
| 591 | PERROR("Failed to receive credentials"); |
| 592 | goto error; |
| 593 | } |
| 594 | |
| 595 | wait_pid_ret = waitpid(fork_ret, &child_status, 0); |
| 596 | if (wait_pid_ret == -1) { |
| 597 | PERROR("Failed to wait for termination of child process"); |
| 598 | goto error; |
| 599 | } |
| 600 | if (!WIFEXITED(child_status) || WEXITSTATUS(child_status)) { |
| 601 | diag("Child process reported an error, test failed"); |
| 602 | goto error; |
| 603 | } |
| 604 | |
| 605 | ok(expected_creds.euid == received_creds.uid, |
| 606 | "Received the expected effective uid (%d == %d)", |
| 607 | expected_creds.euid, |
| 608 | received_creds.uid); |
| 609 | ok(expected_creds.egid == received_creds.gid, |
| 610 | "Received the expected effective gid (%d == %d)", |
| 611 | expected_creds.egid, |
| 612 | received_creds.gid); |
| 613 | ok(expected_creds.pid == received_creds.pid, |
| 614 | "Received the expected pid (%d == %d)", |
| 615 | expected_creds.pid, |
| 616 | received_creds.pid); |
| 617 | } |
| 618 | |
| 619 | error: |
| 620 | if (parent_socket >= 0) { |
| 621 | ret = close(parent_socket); |
| 622 | if (ret) { |
| 623 | PERROR("Failed to close parent socket"); |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | if (fork_ret == 0) { |
| 628 | /* Prevent libtap from printing a result for the child. */ |
| 629 | fclose(stdout); |
| 630 | fclose(stderr); |
| 631 | |
| 632 | /* Child exits at the end of this test. */ |
| 633 | exit(0); |
| 634 | } else if (parent_socket >= 0) { |
| 635 | if (child_connection_socket >= 0) { |
| 636 | ret = close(child_connection_socket); |
| 637 | if (ret) { |
| 638 | PERROR("Failed to close child connection socket"); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | ret = unlink(socket_path); |
| 643 | if (ret) { |
| 644 | PERROR("Failed to unlink socket at path `%s`", socket_path); |
| 645 | } |
| 646 | |
| 647 | ret = rmdir(socket_dir_path); |
| 648 | if (ret) { |
| 649 | PERROR("Failed to remove test directory at `%s`", socket_dir_path); |
| 650 | } |
| 651 | } |
| 652 | } |
| 653 | |
| 654 | int main() |
| 655 | { |
| 656 | plan_tests(TEST_COUNT); |
| 657 | |
| 658 | test_high_fd_count(HIGH_FD_COUNT); |
| 659 | test_one_fd_per_message(MESSAGE_COUNT); |
| 660 | test_receive_in_chunks(LARGE_PAYLOAD_SIZE, LARGE_PAYLOAD_RECV_SIZE); |
| 661 | test_creds_passing(); |
| 662 | |
| 663 | return exit_status(); |
| 664 | } |