src/common/session-rotation.c

   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 <lttng/condition/condition-internal.h>
   9 #include <lttng/condition/session-rotation-internal.h>
  10 #include <lttng/location-internal.h>
  11 #include <common/macros.h>
  12 #include <common/error.h>
  13 #include <assert.h>
  14 #include <stdbool.h>
  15
  16 static
  17 bool lttng_condition_session_rotation_validate(
  18                 const struct lttng_condition *condition);
  19 static
  20 int lttng_condition_session_rotation_serialize(
  21                 const struct lttng_condition *condition,
  22                 struct lttng_dynamic_buffer *buf);
  23 static
  24 bool lttng_condition_session_rotation_is_equal(const struct lttng_condition *_a,
  25                 const struct lttng_condition *_b);
  26 static
  27 void lttng_condition_session_rotation_destroy(
  28                 struct lttng_condition *condition);
  29
  30 static const
  31 struct lttng_condition rotation_condition_template = {
  32         /* .type omitted; shall be set on creation. */
  33         .validate = lttng_condition_session_rotation_validate,
  34         .serialize = lttng_condition_session_rotation_serialize,
  35         .equal = lttng_condition_session_rotation_is_equal,
  36         .destroy = lttng_condition_session_rotation_destroy,
  37 };
  38
  39 static
  40 int lttng_evaluation_session_rotation_serialize(
  41                 const struct lttng_evaluation *evaluation,
  42                 struct lttng_dynamic_buffer *buf);
  43 static
  44 void lttng_evaluation_session_rotation_destroy(
  45                 struct lttng_evaluation *evaluation);
  46
  47 static const
  48 struct lttng_evaluation rotation_evaluation_template = {
  49         /* .type omitted; shall be set on creation. */
  50         .serialize = lttng_evaluation_session_rotation_serialize,
  51         .destroy = lttng_evaluation_session_rotation_destroy,
  52 };
  53
  54 static
  55 bool is_rotation_condition(const struct lttng_condition *condition)
  56 {
  57         enum lttng_condition_type type = lttng_condition_get_type(condition);
  58
  59         return type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING ||
  60                         type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED;
  61 }
  62
  63 static
  64 bool is_rotation_evaluation(const struct lttng_evaluation *evaluation)
  65 {
  66         enum lttng_condition_type type = lttng_evaluation_get_type(evaluation);
  67
  68         return type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING ||
  69                         type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED;
  70 }
  71
  72 static
  73 bool lttng_condition_session_rotation_validate(
  74                 const struct lttng_condition *condition)
  75 {
  76         bool valid = false;
  77         struct lttng_condition_session_rotation *rotation;
  78
  79         if (!condition) {
  80                 goto end;
  81         }
  82
  83         rotation = container_of(condition,
  84                         struct lttng_condition_session_rotation, parent);
  85         if (!rotation->session_name) {
  86                 ERR("Invalid session rotation condition: a target session name must be set.");
  87                 goto end;
  88         }
  89
  90         valid = true;
  91 end:
  92         return valid;
  93 }
  94
  95 static
  96 int lttng_condition_session_rotation_serialize(
  97                 const struct lttng_condition *condition,
  98                 struct lttng_dynamic_buffer *buf)
  99 {
 100         int ret;
 101         size_t session_name_len;
 102         struct lttng_condition_session_rotation *rotation;
 103         struct lttng_condition_session_rotation_comm rotation_comm;
 104
 105         if (!condition || !is_rotation_condition(condition)) {
 106                 ret = -1;
 107                 goto end;
 108         }
 109
 110         DBG("Serializing session rotation condition");
 111         rotation = container_of(condition, struct lttng_condition_session_rotation,
 112                         parent);
 113
 114         session_name_len = strlen(rotation->session_name) + 1;
 115         if (session_name_len > LTTNG_NAME_MAX) {
 116                 ret = -1;
 117                 goto end;
 118         }
 119
 120         rotation_comm.session_name_len = session_name_len;
 121         ret = lttng_dynamic_buffer_append(buf, &rotation_comm,
 122                         sizeof(rotation_comm));
 123         if (ret) {
 124                 goto end;
 125         }
 126         ret = lttng_dynamic_buffer_append(buf, rotation->session_name,
 127                         session_name_len);
 128         if (ret) {
 129                 goto end;
 130         }
 131 end:
 132         return ret;
 133 }
 134
 135 static
 136 bool lttng_condition_session_rotation_is_equal(const struct lttng_condition *_a,
 137                 const struct lttng_condition *_b)
 138 {
 139         bool is_equal = false;
 140         struct lttng_condition_session_rotation *a, *b;
 141
 142         a = container_of(_a, struct lttng_condition_session_rotation, parent);
 143         b = container_of(_b, struct lttng_condition_session_rotation, parent);
 144
 145         /* Both session names must be set or both must be unset. */
 146         if ((a->session_name && !b->session_name) ||
 147                         (!a->session_name && b->session_name)) {
 148                 WARN("Comparing session rotation conditions with uninitialized session names.");
 149                 goto end;
 150         }
 151
 152         if (a->session_name && b->session_name &&
 153                         strcmp(a->session_name, b->session_name)) {
 154                 goto end;
 155         }
 156
 157         is_equal = true;
 158 end:
 159         return is_equal;
 160 }
 161
 162 static
 163 void lttng_condition_session_rotation_destroy(
 164                 struct lttng_condition *condition)
 165 {
 166         struct lttng_condition_session_rotation *rotation;
 167
 168         rotation = container_of(condition,
 169                         struct lttng_condition_session_rotation, parent);
 170
 171         free(rotation->session_name);
 172         free(rotation);
 173 }
 174
 175 static
 176 struct lttng_condition *lttng_condition_session_rotation_create(
 177                 enum lttng_condition_type type)
 178 {
 179         struct lttng_condition_session_rotation *condition;
 180
 181         condition = zmalloc(sizeof(struct lttng_condition_session_rotation));
 182         if (!condition) {
 183                 return NULL;
 184         }
 185
 186         memcpy(&condition->parent, &rotation_condition_template,
 187                         sizeof(condition->parent));
 188         lttng_condition_init(&condition->parent, type);
 189         return &condition->parent;
 190 }
 191
 192 struct lttng_condition *lttng_condition_session_rotation_ongoing_create(void)
 193 {
 194         return lttng_condition_session_rotation_create(
 195                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING);
 196 }
 197
 198 struct lttng_condition *lttng_condition_session_rotation_completed_create(void)
 199 {
 200         return lttng_condition_session_rotation_create(
 201                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED);
 202 }
 203
 204 static
 205 ssize_t init_condition_from_buffer(struct lttng_condition *condition,
 206                 const struct lttng_buffer_view *src_view)
 207 {
 208         ssize_t ret, condition_size;
 209         enum lttng_condition_status status;
 210         const struct lttng_condition_session_rotation_comm *condition_comm;
 211         const char *session_name;
 212         struct lttng_buffer_view name_view;
 213
 214         if (src_view->size < sizeof(*condition_comm)) {
 215                 ERR("Failed to initialize from malformed condition buffer: buffer too short to contain header");
 216                 ret = -1;
 217                 goto end;
 218         }
 219
 220         condition_comm = (const struct lttng_condition_session_rotation_comm *) src_view->data;
 221         name_view = lttng_buffer_view_from_view(src_view,
 222                         sizeof(*condition_comm), -1);
 223
 224         if (condition_comm->session_name_len > LTTNG_NAME_MAX) {
 225                 ERR("Failed to initialize from malformed condition buffer: name exceeds LTTNG_MAX_NAME");
 226                 ret = -1;
 227                 goto end;
 228         }
 229
 230         if (name_view.size < condition_comm->session_name_len) {
 231                 ERR("Failed to initialize from malformed condition buffer: buffer too short to contain session name");
 232                 ret = -1;
 233                 goto end;
 234         }
 235
 236         session_name = name_view.data;
 237         if (*(session_name + condition_comm->session_name_len - 1) != '\0') {
 238                 ERR("Malformed session name encountered in condition buffer");
 239                 ret = -1;
 240                 goto end;
 241         }
 242
 243         status = lttng_condition_session_rotation_set_session_name(condition,
 244                         session_name);
 245         if (status != LTTNG_CONDITION_STATUS_OK) {
 246                 ERR("Failed to set buffer consumed session name");
 247                 ret = -1;
 248                 goto end;
 249         }
 250
 251         if (!lttng_condition_validate(condition)) {
 252                 ret = -1;
 253                 goto end;
 254         }
 255
 256         condition_size = sizeof(*condition_comm) +
 257                         (ssize_t) condition_comm->session_name_len;
 258         ret = condition_size;
 259 end:
 260         return ret;
 261 }
 262
 263 static
 264 ssize_t lttng_condition_session_rotation_create_from_buffer(
 265                 const struct lttng_buffer_view *view,
 266                 struct lttng_condition **_condition,
 267                 enum lttng_condition_type type)
 268 {
 269         ssize_t ret;
 270         struct lttng_condition *condition = NULL;
 271
 272         switch (type) {
 273         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
 274                 condition = lttng_condition_session_rotation_ongoing_create();
 275                 break;
 276         case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
 277                 condition = lttng_condition_session_rotation_completed_create();
 278                 break;
 279         default:
 280                 ret = -1;
 281                 goto error;
 282         }
 283
 284         if (!_condition || !condition) {
 285                 ret = -1;
 286                 goto error;
 287         }
 288
 289         ret = init_condition_from_buffer(condition, view);
 290         if (ret < 0) {
 291                 goto error;
 292         }
 293
 294         *_condition = condition;
 295         return ret;
 296 error:
 297         lttng_condition_destroy(condition);
 298         return ret;
 299 }
 300
 301 LTTNG_HIDDEN
 302 ssize_t lttng_condition_session_rotation_ongoing_create_from_buffer(
 303                 const struct lttng_buffer_view *view,
 304                 struct lttng_condition **condition)
 305 {
 306         return lttng_condition_session_rotation_create_from_buffer(view,
 307                         condition,
 308                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING);
 309 }
 310
 311 LTTNG_HIDDEN
 312 ssize_t lttng_condition_session_rotation_completed_create_from_buffer(
 313                 const struct lttng_buffer_view *view,
 314                 struct lttng_condition **condition)
 315 {
 316         return lttng_condition_session_rotation_create_from_buffer(view,
 317                         condition,
 318                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED);
 319 }
 320
 321 static
 322 struct lttng_evaluation *lttng_evaluation_session_rotation_create(
 323                 enum lttng_condition_type type, uint64_t id,
 324                 struct lttng_trace_archive_location *location)
 325 {
 326         struct lttng_evaluation_session_rotation *evaluation;
 327
 328         evaluation = zmalloc(sizeof(struct lttng_evaluation_session_rotation));
 329         if (!evaluation) {
 330                 return NULL;
 331         }
 332
 333         memcpy(&evaluation->parent, &rotation_evaluation_template,
 334                         sizeof(evaluation->parent));
 335         lttng_evaluation_init(&evaluation->parent, type);
 336         evaluation->id = id;
 337         evaluation->location = location;
 338         return &evaluation->parent;
 339 }
 340
 341 static
 342 ssize_t create_evaluation_from_buffer(
 343                 enum lttng_condition_type type,
 344                 const struct lttng_buffer_view *view,
 345                 struct lttng_evaluation **_evaluation)
 346 {
 347         ssize_t ret, size;
 348         struct lttng_evaluation *evaluation = NULL;
 349         struct lttng_trace_archive_location *location = NULL;
 350         const struct lttng_evaluation_session_rotation_comm *comm =
 351                         (const struct lttng_evaluation_session_rotation_comm *) view->data;
 352         struct lttng_buffer_view location_view;
 353
 354         if (view->size < sizeof(*comm)) {
 355                 goto error;
 356         }
 357
 358         size = sizeof(*comm);
 359         if (comm->has_location) {
 360                 location_view = lttng_buffer_view_from_view(view, sizeof(*comm),
 361                                 -1);
 362                 if (!location_view.data) {
 363                         goto error;
 364                 }
 365
 366                 ret = lttng_trace_archive_location_create_from_buffer(
 367                                 &location_view, &location);
 368                 if (ret < 0) {
 369                         goto error;
 370                 }
 371                 size += ret;
 372         }
 373
 374         evaluation = lttng_evaluation_session_rotation_create(type, comm->id,
 375                         location);
 376         if (!evaluation) {
 377                 goto error;
 378         }
 379
 380         ret = size;
 381         *_evaluation = evaluation;
 382         return ret;
 383 error:
 384         lttng_trace_archive_location_destroy(location);
 385         evaluation = NULL;
 386         return -1;
 387 }
 388
 389 static
 390 ssize_t lttng_evaluation_session_rotation_create_from_buffer(
 391                 enum lttng_condition_type type,
 392                 const struct lttng_buffer_view *view,
 393                 struct lttng_evaluation **_evaluation)
 394 {
 395         ssize_t ret;
 396         struct lttng_evaluation *evaluation = NULL;
 397
 398         if (!_evaluation) {
 399                 ret = -1;
 400                 goto error;
 401         }
 402
 403         ret = create_evaluation_from_buffer(type, view, &evaluation);
 404         if (ret < 0) {
 405                 goto error;
 406         }
 407
 408         *_evaluation = evaluation;
 409         return ret;
 410 error:
 411         lttng_evaluation_destroy(evaluation);
 412         return ret;
 413 }
 414
 415 LTTNG_HIDDEN
 416 ssize_t lttng_evaluation_session_rotation_ongoing_create_from_buffer(
 417                 const struct lttng_buffer_view *view,
 418                 struct lttng_evaluation **evaluation)
 419 {
 420         return lttng_evaluation_session_rotation_create_from_buffer(
 421                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING,
 422                         view, evaluation);
 423 }
 424
 425 LTTNG_HIDDEN
 426 ssize_t lttng_evaluation_session_rotation_completed_create_from_buffer(
 427                 const struct lttng_buffer_view *view,
 428                 struct lttng_evaluation **evaluation)
 429 {
 430         return lttng_evaluation_session_rotation_create_from_buffer(
 431                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED,
 432                         view, evaluation);
 433 }
 434
 435 LTTNG_HIDDEN
 436 struct lttng_evaluation *lttng_evaluation_session_rotation_ongoing_create(
 437                 uint64_t id)
 438 {
 439         return lttng_evaluation_session_rotation_create(
 440                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING, id,
 441                         NULL);
 442 }
 443
 444 LTTNG_HIDDEN
 445 struct lttng_evaluation *lttng_evaluation_session_rotation_completed_create(
 446                 uint64_t id, struct lttng_trace_archive_location *location)
 447 {
 448         return lttng_evaluation_session_rotation_create(
 449                         LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED, id,
 450                         location);
 451 }
 452
 453 enum lttng_condition_status
 454 lttng_condition_session_rotation_get_session_name(
 455                 const struct lttng_condition *condition,
 456                 const char **session_name)
 457 {
 458         struct lttng_condition_session_rotation *rotation;
 459         enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
 460
 461         if (!condition || !is_rotation_condition(condition) || !session_name) {
 462                 status = LTTNG_CONDITION_STATUS_INVALID;
 463                 goto end;
 464         }
 465
 466         rotation = container_of(condition, struct lttng_condition_session_rotation,
 467                         parent);
 468         if (!rotation->session_name) {
 469                 status = LTTNG_CONDITION_STATUS_UNSET;
 470                 goto end;
 471         }
 472         *session_name = rotation->session_name;
 473 end:
 474         return status;
 475 }
 476
 477 enum lttng_condition_status
 478 lttng_condition_session_rotation_set_session_name(
 479                 struct lttng_condition *condition, const char *session_name)
 480 {
 481         char *session_name_copy;
 482         struct lttng_condition_session_rotation *rotation;
 483         enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
 484
 485         if (!condition || !is_rotation_condition(condition) ||
 486                         !session_name || strlen(session_name) == 0) {
 487                 status = LTTNG_CONDITION_STATUS_INVALID;
 488                 goto end;
 489         }
 490
 491         rotation = container_of(condition,
 492                         struct lttng_condition_session_rotation, parent);
 493         session_name_copy = strdup(session_name);
 494         if (!session_name_copy) {
 495                 status = LTTNG_CONDITION_STATUS_ERROR;
 496                 goto end;
 497         }
 498
 499         free(rotation->session_name);
 500         rotation->session_name = session_name_copy;
 501 end:
 502         return status;
 503 }
 504
 505 static
 506 int lttng_evaluation_session_rotation_serialize(
 507                 const struct lttng_evaluation *evaluation,
 508                 struct lttng_dynamic_buffer *buf)
 509 {
 510         int ret;
 511         struct lttng_evaluation_session_rotation *rotation;
 512         struct lttng_evaluation_session_rotation_comm comm = { 0 };
 513
 514         rotation = container_of(evaluation,
 515                         struct lttng_evaluation_session_rotation, parent);
 516         comm.id = rotation->id;
 517         comm.has_location = !!rotation->location;
 518         ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm));
 519         if (ret) {
 520                 goto end;
 521         }
 522         if (!rotation->location) {
 523                 goto end;
 524         }
 525         ret = lttng_trace_archive_location_serialize(rotation->location,
 526                         buf);
 527 end:
 528         return ret;
 529 }
 530
 531 static
 532 void lttng_evaluation_session_rotation_destroy(
 533                 struct lttng_evaluation *evaluation)
 534 {
 535         struct lttng_evaluation_session_rotation *rotation;
 536
 537         rotation = container_of(evaluation,
 538                         struct lttng_evaluation_session_rotation, parent);
 539         lttng_trace_archive_location_destroy(rotation->location);
 540         free(rotation);
 541 }
 542
 543 enum lttng_evaluation_status
 544 lttng_evaluation_session_rotation_get_id(
 545                 const struct lttng_evaluation *evaluation, uint64_t *id)
 546 {
 547         const struct lttng_evaluation_session_rotation *rotation;
 548         enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK;
 549
 550         if (!evaluation || !id || !is_rotation_evaluation(evaluation)) {
 551                 status = LTTNG_EVALUATION_STATUS_INVALID;
 552                 goto end;
 553         }
 554
 555         rotation = container_of(evaluation,
 556                         struct lttng_evaluation_session_rotation, parent);
 557         *id = rotation->id;
 558 end:
 559         return status;
 560 }
 561
 562 enum lttng_evaluation_status
 563 lttng_evaluation_session_rotation_completed_get_location(
 564                 const struct lttng_evaluation *evaluation,
 565                 const struct lttng_trace_archive_location **location)
 566 {
 567         const struct lttng_evaluation_session_rotation *rotation;
 568         enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK;
 569
 570         if (!evaluation || !location ||
 571                         evaluation->type != LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED) {
 572                 status = LTTNG_EVALUATION_STATUS_INVALID;
 573                 goto end;
 574         }
 575
 576         rotation = container_of(evaluation,
 577                         struct lttng_evaluation_session_rotation, parent);
 578         *location = rotation->location;
 579 end:
 580         return status;
 581 }