| 1 | /* |
| 2 | * Copyright (C) 2019 Simon Marchi <simon.marchi@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <assert.h> |
| 9 | #include <common/error.h> |
| 10 | #include <common/macros.h> |
| 11 | #include <common/mi-lttng.h> |
| 12 | #include <lttng/action/action-internal.h> |
| 13 | #include <lttng/action/rate-policy-internal.h> |
| 14 | #include <lttng/action/rate-policy.h> |
| 15 | #include <lttng/action/start-session-internal.h> |
| 16 | #include <lttng/action/start-session.h> |
| 17 | |
| 18 | #define IS_START_SESSION_ACTION(action) \ |
| 19 | (lttng_action_get_type(action) == LTTNG_ACTION_TYPE_START_SESSION) |
| 20 | |
| 21 | struct lttng_action_start_session { |
| 22 | struct lttng_action parent; |
| 23 | |
| 24 | /* Owned by this. */ |
| 25 | char *session_name; |
| 26 | struct lttng_rate_policy *policy; |
| 27 | }; |
| 28 | |
| 29 | struct lttng_action_start_session_comm { |
| 30 | /* Includes the trailing \0. */ |
| 31 | uint32_t session_name_len; |
| 32 | |
| 33 | /* |
| 34 | * Variable data: |
| 35 | * |
| 36 | * - session name (null terminated) |
| 37 | * - policy |
| 38 | */ |
| 39 | char data[]; |
| 40 | } LTTNG_PACKED; |
| 41 | |
| 42 | static const struct lttng_rate_policy * |
| 43 | lttng_action_start_session_internal_get_rate_policy( |
| 44 | const struct lttng_action *action); |
| 45 | |
| 46 | static struct lttng_action_start_session *action_start_session_from_action( |
| 47 | struct lttng_action *action) |
| 48 | { |
| 49 | assert(action); |
| 50 | |
| 51 | return container_of(action, struct lttng_action_start_session, parent); |
| 52 | } |
| 53 | |
| 54 | static const struct lttng_action_start_session * |
| 55 | action_start_session_from_action_const(const struct lttng_action *action) |
| 56 | { |
| 57 | assert(action); |
| 58 | |
| 59 | return container_of(action, struct lttng_action_start_session, parent); |
| 60 | } |
| 61 | |
| 62 | static bool lttng_action_start_session_validate(struct lttng_action *action) |
| 63 | { |
| 64 | bool valid; |
| 65 | struct lttng_action_start_session *action_start_session; |
| 66 | |
| 67 | if (!action) { |
| 68 | valid = false; |
| 69 | goto end; |
| 70 | } |
| 71 | |
| 72 | action_start_session = action_start_session_from_action(action); |
| 73 | |
| 74 | /* A non-empty session name is mandatory. */ |
| 75 | if (!action_start_session->session_name || |
| 76 | strlen(action_start_session->session_name) == 0) { |
| 77 | valid = false; |
| 78 | goto end; |
| 79 | } |
| 80 | |
| 81 | valid = true; |
| 82 | end: |
| 83 | return valid; |
| 84 | } |
| 85 | |
| 86 | static bool lttng_action_start_session_is_equal( |
| 87 | const struct lttng_action *_a, const struct lttng_action *_b) |
| 88 | { |
| 89 | bool is_equal = false; |
| 90 | struct lttng_action_start_session *a, *b; |
| 91 | |
| 92 | a = container_of(_a, struct lttng_action_start_session, parent); |
| 93 | b = container_of(_b, struct lttng_action_start_session, parent); |
| 94 | |
| 95 | /* Action is not valid if this is not true. */ |
| 96 | assert(a->session_name); |
| 97 | assert(b->session_name); |
| 98 | if (strcmp(a->session_name, b->session_name)) { |
| 99 | goto end; |
| 100 | } |
| 101 | |
| 102 | is_equal = lttng_rate_policy_is_equal(a->policy, b->policy); |
| 103 | end: |
| 104 | return is_equal; |
| 105 | } |
| 106 | |
| 107 | static int lttng_action_start_session_serialize( |
| 108 | struct lttng_action *action, struct lttng_payload *payload) |
| 109 | { |
| 110 | struct lttng_action_start_session *action_start_session; |
| 111 | struct lttng_action_start_session_comm comm; |
| 112 | size_t session_name_len; |
| 113 | int ret; |
| 114 | |
| 115 | assert(action); |
| 116 | assert(payload); |
| 117 | |
| 118 | action_start_session = action_start_session_from_action(action); |
| 119 | |
| 120 | assert(action_start_session->session_name); |
| 121 | |
| 122 | DBG("Serializing start session action: session-name: %s", |
| 123 | action_start_session->session_name); |
| 124 | |
| 125 | session_name_len = strlen(action_start_session->session_name) + 1; |
| 126 | comm.session_name_len = session_name_len; |
| 127 | |
| 128 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm)); |
| 129 | if (ret) { |
| 130 | ret = -1; |
| 131 | goto end; |
| 132 | } |
| 133 | |
| 134 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 135 | action_start_session->session_name, session_name_len); |
| 136 | if (ret) { |
| 137 | ret = -1; |
| 138 | goto end; |
| 139 | } |
| 140 | |
| 141 | ret = lttng_rate_policy_serialize( |
| 142 | action_start_session->policy, payload); |
| 143 | if (ret) { |
| 144 | ret = -1; |
| 145 | goto end; |
| 146 | } |
| 147 | |
| 148 | ret = 0; |
| 149 | end: |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | static void lttng_action_start_session_destroy(struct lttng_action *action) |
| 154 | { |
| 155 | struct lttng_action_start_session *action_start_session; |
| 156 | |
| 157 | if (!action) { |
| 158 | goto end; |
| 159 | } |
| 160 | |
| 161 | action_start_session = action_start_session_from_action(action); |
| 162 | |
| 163 | lttng_rate_policy_destroy(action_start_session->policy); |
| 164 | free(action_start_session->session_name); |
| 165 | free(action_start_session); |
| 166 | |
| 167 | end: |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | ssize_t lttng_action_start_session_create_from_payload( |
| 172 | struct lttng_payload_view *view, |
| 173 | struct lttng_action **p_action) |
| 174 | { |
| 175 | ssize_t consumed_len, ret; |
| 176 | const struct lttng_action_start_session_comm *comm; |
| 177 | const char *session_name; |
| 178 | struct lttng_action *action = NULL; |
| 179 | enum lttng_action_status status; |
| 180 | struct lttng_rate_policy *policy = NULL; |
| 181 | |
| 182 | comm = (typeof(comm)) view->buffer.data; |
| 183 | session_name = (const char *) &comm->data; |
| 184 | |
| 185 | /* Session name */ |
| 186 | if (!lttng_buffer_view_contains_string(&view->buffer, session_name, |
| 187 | comm->session_name_len)) { |
| 188 | consumed_len = -1; |
| 189 | goto end; |
| 190 | } |
| 191 | consumed_len = sizeof(*comm) + comm->session_name_len; |
| 192 | |
| 193 | /* Rate policy. */ |
| 194 | { |
| 195 | struct lttng_payload_view policy_view = |
| 196 | lttng_payload_view_from_view( |
| 197 | view, consumed_len, -1); |
| 198 | ret = lttng_rate_policy_create_from_payload( |
| 199 | &policy_view, &policy); |
| 200 | if (ret < 0) { |
| 201 | consumed_len = -1; |
| 202 | goto end; |
| 203 | } |
| 204 | consumed_len += ret; |
| 205 | } |
| 206 | |
| 207 | action = lttng_action_start_session_create(); |
| 208 | if (!action) { |
| 209 | consumed_len = -1; |
| 210 | goto end; |
| 211 | } |
| 212 | |
| 213 | status = lttng_action_start_session_set_session_name( |
| 214 | action, session_name); |
| 215 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 216 | consumed_len = -1; |
| 217 | goto end; |
| 218 | } |
| 219 | |
| 220 | assert(policy); |
| 221 | status = lttng_action_start_session_set_rate_policy(action, policy); |
| 222 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 223 | consumed_len = -1; |
| 224 | goto end; |
| 225 | } |
| 226 | |
| 227 | *p_action = action; |
| 228 | action = NULL; |
| 229 | |
| 230 | end: |
| 231 | lttng_rate_policy_destroy(policy); |
| 232 | lttng_action_start_session_destroy(action); |
| 233 | |
| 234 | return consumed_len; |
| 235 | } |
| 236 | |
| 237 | static enum lttng_error_code lttng_action_start_session_mi_serialize( |
| 238 | const struct lttng_action *action, struct mi_writer *writer) |
| 239 | { |
| 240 | int ret; |
| 241 | enum lttng_error_code ret_code; |
| 242 | enum lttng_action_status status; |
| 243 | const char *session_name = NULL; |
| 244 | const struct lttng_rate_policy *policy = NULL; |
| 245 | |
| 246 | assert(action); |
| 247 | assert(IS_START_SESSION_ACTION(action)); |
| 248 | |
| 249 | status = lttng_action_start_session_get_session_name( |
| 250 | action, &session_name); |
| 251 | assert(status == LTTNG_ACTION_STATUS_OK); |
| 252 | assert(session_name != NULL); |
| 253 | |
| 254 | status = lttng_action_start_session_get_rate_policy(action, &policy); |
| 255 | assert(status == LTTNG_ACTION_STATUS_OK); |
| 256 | assert(policy != NULL); |
| 257 | |
| 258 | /* Open action start session element. */ |
| 259 | ret = mi_lttng_writer_open_element( |
| 260 | writer, mi_lttng_element_action_start_session); |
| 261 | if (ret) { |
| 262 | goto mi_error; |
| 263 | } |
| 264 | |
| 265 | /* Session name. */ |
| 266 | ret = mi_lttng_writer_write_element_string( |
| 267 | writer, mi_lttng_element_session_name, session_name); |
| 268 | if (ret) { |
| 269 | goto mi_error; |
| 270 | } |
| 271 | |
| 272 | /* Rate policy. */ |
| 273 | ret_code = lttng_rate_policy_mi_serialize(policy, writer); |
| 274 | if (ret_code != LTTNG_OK) { |
| 275 | goto end; |
| 276 | } |
| 277 | |
| 278 | /* Close action start session element. */ |
| 279 | ret = mi_lttng_writer_close_element(writer); |
| 280 | if (ret) { |
| 281 | goto mi_error; |
| 282 | } |
| 283 | |
| 284 | ret_code = LTTNG_OK; |
| 285 | goto end; |
| 286 | |
| 287 | mi_error: |
| 288 | ret_code = LTTNG_ERR_MI_IO_FAIL; |
| 289 | end: |
| 290 | return ret_code; |
| 291 | } |
| 292 | |
| 293 | struct lttng_action *lttng_action_start_session_create(void) |
| 294 | { |
| 295 | struct lttng_action *action = NULL; |
| 296 | struct lttng_rate_policy *policy = NULL; |
| 297 | enum lttng_action_status status; |
| 298 | |
| 299 | /* Create a every N = 1 rate policy. */ |
| 300 | policy = lttng_rate_policy_every_n_create(1); |
| 301 | if (!policy) { |
| 302 | goto end; |
| 303 | } |
| 304 | |
| 305 | action = zmalloc(sizeof(struct lttng_action_start_session)); |
| 306 | if (!action) { |
| 307 | goto end; |
| 308 | } |
| 309 | |
| 310 | lttng_action_init(action, LTTNG_ACTION_TYPE_START_SESSION, |
| 311 | lttng_action_start_session_validate, |
| 312 | lttng_action_start_session_serialize, |
| 313 | lttng_action_start_session_is_equal, |
| 314 | lttng_action_start_session_destroy, |
| 315 | lttng_action_start_session_internal_get_rate_policy, |
| 316 | lttng_action_generic_add_error_query_results, |
| 317 | lttng_action_start_session_mi_serialize); |
| 318 | |
| 319 | status = lttng_action_start_session_set_rate_policy(action, policy); |
| 320 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 321 | free(action); |
| 322 | action = NULL; |
| 323 | goto end; |
| 324 | } |
| 325 | |
| 326 | end: |
| 327 | lttng_rate_policy_destroy(policy); |
| 328 | return action; |
| 329 | } |
| 330 | |
| 331 | enum lttng_action_status lttng_action_start_session_set_session_name( |
| 332 | struct lttng_action *action, const char *session_name) |
| 333 | { |
| 334 | struct lttng_action_start_session *action_start_session; |
| 335 | enum lttng_action_status status; |
| 336 | |
| 337 | if (!action || !IS_START_SESSION_ACTION(action) || !session_name || |
| 338 | strlen(session_name) == 0) { |
| 339 | status = LTTNG_ACTION_STATUS_INVALID; |
| 340 | goto end; |
| 341 | } |
| 342 | |
| 343 | action_start_session = action_start_session_from_action(action); |
| 344 | |
| 345 | free(action_start_session->session_name); |
| 346 | |
| 347 | action_start_session->session_name = strdup(session_name); |
| 348 | if (!action_start_session->session_name) { |
| 349 | status = LTTNG_ACTION_STATUS_ERROR; |
| 350 | goto end; |
| 351 | } |
| 352 | |
| 353 | status = LTTNG_ACTION_STATUS_OK; |
| 354 | end: |
| 355 | return status; |
| 356 | } |
| 357 | |
| 358 | enum lttng_action_status lttng_action_start_session_get_session_name( |
| 359 | const struct lttng_action *action, const char **session_name) |
| 360 | { |
| 361 | const struct lttng_action_start_session *action_start_session; |
| 362 | enum lttng_action_status status; |
| 363 | |
| 364 | if (!action || !IS_START_SESSION_ACTION(action) || !session_name) { |
| 365 | status = LTTNG_ACTION_STATUS_INVALID; |
| 366 | goto end; |
| 367 | } |
| 368 | |
| 369 | action_start_session = action_start_session_from_action_const(action); |
| 370 | |
| 371 | *session_name = action_start_session->session_name; |
| 372 | |
| 373 | status = LTTNG_ACTION_STATUS_OK; |
| 374 | end: |
| 375 | return status; |
| 376 | } |
| 377 | |
| 378 | enum lttng_action_status lttng_action_start_session_set_rate_policy( |
| 379 | struct lttng_action *action, |
| 380 | const struct lttng_rate_policy *policy) |
| 381 | { |
| 382 | enum lttng_action_status status; |
| 383 | struct lttng_action_start_session *start_session_action; |
| 384 | struct lttng_rate_policy *copy = NULL; |
| 385 | |
| 386 | if (!action || !policy || !IS_START_SESSION_ACTION(action)) { |
| 387 | status = LTTNG_ACTION_STATUS_INVALID; |
| 388 | goto end; |
| 389 | } |
| 390 | |
| 391 | copy = lttng_rate_policy_copy(policy); |
| 392 | if (!copy) { |
| 393 | status = LTTNG_ACTION_STATUS_ERROR; |
| 394 | goto end; |
| 395 | } |
| 396 | |
| 397 | start_session_action = action_start_session_from_action(action); |
| 398 | |
| 399 | /* Release the previous rate policy .*/ |
| 400 | lttng_rate_policy_destroy(start_session_action->policy); |
| 401 | |
| 402 | /* Assign the policy. */ |
| 403 | start_session_action->policy = copy; |
| 404 | status = LTTNG_ACTION_STATUS_OK; |
| 405 | copy = NULL; |
| 406 | |
| 407 | end: |
| 408 | lttng_rate_policy_destroy(copy); |
| 409 | return status; |
| 410 | } |
| 411 | |
| 412 | enum lttng_action_status lttng_action_start_session_get_rate_policy( |
| 413 | const struct lttng_action *action, |
| 414 | const struct lttng_rate_policy **policy) |
| 415 | { |
| 416 | enum lttng_action_status status; |
| 417 | const struct lttng_action_start_session *start_session_action; |
| 418 | |
| 419 | if (!action || !policy || !IS_START_SESSION_ACTION(action)) { |
| 420 | status = LTTNG_ACTION_STATUS_INVALID; |
| 421 | goto end; |
| 422 | } |
| 423 | |
| 424 | start_session_action = action_start_session_from_action_const(action); |
| 425 | |
| 426 | *policy = start_session_action->policy; |
| 427 | status = LTTNG_ACTION_STATUS_OK; |
| 428 | end: |
| 429 | return status; |
| 430 | } |
| 431 | |
| 432 | static const struct lttng_rate_policy * |
| 433 | lttng_action_start_session_internal_get_rate_policy( |
| 434 | const struct lttng_action *action) |
| 435 | { |
| 436 | const struct lttng_action_start_session *_action; |
| 437 | _action = action_start_session_from_action_const(action); |
| 438 | |
| 439 | return _action->policy; |
| 440 | } |