| 1 | /* |
| 2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
| 3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0-only |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #define _LGPL_SOURCE |
| 10 | #include <assert.h> |
| 11 | #include <urcu/uatomic.h> |
| 12 | #include <urcu/rculist.h> |
| 13 | |
| 14 | #include <common/common.h> |
| 15 | #include <common/sessiond-comm/agent.h> |
| 16 | |
| 17 | #include <common/compat/endian.h> |
| 18 | |
| 19 | #include "agent.h" |
| 20 | #include "ust-app.h" |
| 21 | #include "utils.h" |
| 22 | #include "common/error.h" |
| 23 | |
| 24 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) |
| 25 | |
| 26 | /* |
| 27 | * Agent application context representation. |
| 28 | */ |
| 29 | struct agent_app_ctx { |
| 30 | char *provider_name; |
| 31 | char *ctx_name; |
| 32 | |
| 33 | /* agent_app_ctx are part of the agent app_ctx_list. */ |
| 34 | struct cds_list_head list_node; |
| 35 | |
| 36 | /* For call_rcu teardown. */ |
| 37 | struct rcu_head rcu_node; |
| 38 | }; |
| 39 | |
| 40 | /* |
| 41 | * Human readable agent return code. |
| 42 | */ |
| 43 | static const char *error_string_array[] = { |
| 44 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", |
| 45 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", |
| 46 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", |
| 47 | |
| 48 | /* Last element */ |
| 49 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", |
| 50 | }; |
| 51 | |
| 52 | static |
| 53 | void log_reply_code(uint32_t in_reply_ret_code) |
| 54 | { |
| 55 | int level = PRINT_DBG3; |
| 56 | /* |
| 57 | * reply_ret_code and in_reply_ret_code are kept separate to have a |
| 58 | * sanitized value (used to retrieve the human readable string) and the |
| 59 | * original value which is logged as-is. |
| 60 | */ |
| 61 | uint32_t reply_ret_code = in_reply_ret_code; |
| 62 | |
| 63 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || |
| 64 | reply_ret_code >= AGENT_RET_CODE_NR) { |
| 65 | reply_ret_code = AGENT_RET_CODE_NR; |
| 66 | level = PRINT_ERR; |
| 67 | } |
| 68 | |
| 69 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", |
| 70 | error_string_array[AGENT_RET_CODE_INDEX( |
| 71 | reply_ret_code)], |
| 72 | in_reply_ret_code); |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Match function for the events hash table lookup by name. |
| 77 | */ |
| 78 | static int ht_match_event_by_name(struct cds_lfht_node *node, |
| 79 | const void *_key) |
| 80 | { |
| 81 | struct agent_event *event; |
| 82 | const struct agent_ht_key *key; |
| 83 | |
| 84 | assert(node); |
| 85 | assert(_key); |
| 86 | |
| 87 | event = caa_container_of(node, struct agent_event, node.node); |
| 88 | key = _key; |
| 89 | |
| 90 | /* Match 1 elements of the key: name. */ |
| 91 | |
| 92 | /* Event name */ |
| 93 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { |
| 94 | goto no_match; |
| 95 | } |
| 96 | /* Match. */ |
| 97 | return 1; |
| 98 | |
| 99 | no_match: |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Match function for the events hash table lookup by name and loglevel. |
| 105 | */ |
| 106 | static int ht_match_event(struct cds_lfht_node *node, |
| 107 | const void *_key) |
| 108 | { |
| 109 | struct agent_event *event; |
| 110 | const struct agent_ht_key *key; |
| 111 | int ll_match; |
| 112 | |
| 113 | assert(node); |
| 114 | assert(_key); |
| 115 | |
| 116 | event = caa_container_of(node, struct agent_event, node.node); |
| 117 | key = _key; |
| 118 | |
| 119 | /* Match 2 elements of the key: name and loglevel. */ |
| 120 | |
| 121 | /* Event name */ |
| 122 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { |
| 123 | goto no_match; |
| 124 | } |
| 125 | |
| 126 | /* Event loglevel value and type. */ |
| 127 | ll_match = loglevels_match(event->loglevel_type, |
| 128 | event->loglevel_value, key->loglevel_type, |
| 129 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); |
| 130 | |
| 131 | if (!ll_match) { |
| 132 | goto no_match; |
| 133 | } |
| 134 | |
| 135 | /* Filter expression */ |
| 136 | if (!!event->filter_expression != !!key->filter_expression) { |
| 137 | /* One has a filter expression, the other does not */ |
| 138 | goto no_match; |
| 139 | } |
| 140 | |
| 141 | if (event->filter_expression) { |
| 142 | if (strncmp(event->filter_expression, key->filter_expression, |
| 143 | strlen(event->filter_expression)) != 0) { |
| 144 | goto no_match; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | return 1; |
| 149 | |
| 150 | no_match: |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Add unique agent event based on the event name and loglevel. |
| 156 | */ |
| 157 | static void add_unique_agent_event(struct lttng_ht *ht, |
| 158 | struct agent_event *event) |
| 159 | { |
| 160 | struct cds_lfht_node *node_ptr; |
| 161 | struct agent_ht_key key; |
| 162 | |
| 163 | assert(ht); |
| 164 | assert(ht->ht); |
| 165 | assert(event); |
| 166 | |
| 167 | key.name = event->name; |
| 168 | key.loglevel_value = event->loglevel_value; |
| 169 | key.loglevel_type = event->loglevel_type; |
| 170 | key.filter_expression = event->filter_expression; |
| 171 | |
| 172 | node_ptr = cds_lfht_add_unique(ht->ht, |
| 173 | ht->hash_fct(event->node.key, lttng_ht_seed), |
| 174 | ht_match_event, &key, &event->node.node); |
| 175 | assert(node_ptr == &event->node.node); |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * URCU delayed agent event reclaim. |
| 180 | */ |
| 181 | static void destroy_event_agent_rcu(struct rcu_head *head) |
| 182 | { |
| 183 | struct lttng_ht_node_str *node = |
| 184 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 185 | struct agent_event *event = |
| 186 | caa_container_of(node, struct agent_event, node); |
| 187 | |
| 188 | agent_destroy_event(event); |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * URCU delayed agent app reclaim. |
| 193 | */ |
| 194 | static void destroy_app_agent_rcu(struct rcu_head *head) |
| 195 | { |
| 196 | struct lttng_ht_node_ulong *node = |
| 197 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 198 | struct agent_app *app = |
| 199 | caa_container_of(node, struct agent_app, node); |
| 200 | |
| 201 | free(app); |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Communication with the agent. Send the message header to the given socket in |
| 206 | * big endian. |
| 207 | * |
| 208 | * Return 0 on success or else a negative errno message of sendmsg() op. |
| 209 | */ |
| 210 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, |
| 211 | uint32_t cmd, uint32_t cmd_version) |
| 212 | { |
| 213 | int ret; |
| 214 | ssize_t size; |
| 215 | struct lttcomm_agent_hdr msg; |
| 216 | |
| 217 | assert(sock); |
| 218 | |
| 219 | memset(&msg, 0, sizeof(msg)); |
| 220 | msg.data_size = htobe64(data_size); |
| 221 | msg.cmd = htobe32(cmd); |
| 222 | msg.cmd_version = htobe32(cmd_version); |
| 223 | |
| 224 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); |
| 225 | if (size < sizeof(msg)) { |
| 226 | ret = -errno; |
| 227 | goto error; |
| 228 | } |
| 229 | ret = 0; |
| 230 | |
| 231 | error: |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * Communication call with the agent. Send the payload to the given socket. The |
| 237 | * header MUST be sent prior to this call. |
| 238 | * |
| 239 | * Return 0 on success or else a negative errno value of sendmsg() op. |
| 240 | */ |
| 241 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
| 242 | size_t size) |
| 243 | { |
| 244 | int ret; |
| 245 | ssize_t len; |
| 246 | |
| 247 | assert(sock); |
| 248 | assert(data); |
| 249 | |
| 250 | len = sock->ops->sendmsg(sock, data, size, 0); |
| 251 | if (len < size) { |
| 252 | ret = -errno; |
| 253 | goto error; |
| 254 | } |
| 255 | ret = 0; |
| 256 | |
| 257 | error: |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * Communication call with the agent. Receive reply from the agent using the |
| 263 | * given socket. |
| 264 | * |
| 265 | * Return 0 on success or else a negative errno value from recvmsg() op. |
| 266 | */ |
| 267 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) |
| 268 | { |
| 269 | int ret; |
| 270 | ssize_t len; |
| 271 | |
| 272 | assert(sock); |
| 273 | assert(buf); |
| 274 | |
| 275 | len = sock->ops->recvmsg(sock, buf, size, 0); |
| 276 | if (len < size) { |
| 277 | ret = -errno; |
| 278 | goto error; |
| 279 | } |
| 280 | ret = 0; |
| 281 | |
| 282 | error: |
| 283 | return ret; |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Internal event listing for a given app. Populate events. |
| 288 | * |
| 289 | * Return number of element in the list or else a negative LTTNG_ERR* code. |
| 290 | * On success, the caller is responsible for freeing the memory |
| 291 | * allocated for "events". |
| 292 | */ |
| 293 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
| 294 | { |
| 295 | int ret, i, len = 0, offset = 0; |
| 296 | uint32_t nb_event; |
| 297 | size_t data_size; |
| 298 | uint32_t reply_ret_code; |
| 299 | struct lttng_event *tmp_events = NULL; |
| 300 | struct lttcomm_agent_list_reply *reply = NULL; |
| 301 | struct lttcomm_agent_list_reply_hdr reply_hdr; |
| 302 | |
| 303 | assert(app); |
| 304 | assert(app->sock); |
| 305 | assert(events); |
| 306 | |
| 307 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
| 308 | app->sock->fd); |
| 309 | |
| 310 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
| 311 | if (ret < 0) { |
| 312 | goto error_io; |
| 313 | } |
| 314 | |
| 315 | /* Get list header so we know how much we'll receive. */ |
| 316 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); |
| 317 | if (ret < 0) { |
| 318 | goto error_io; |
| 319 | } |
| 320 | |
| 321 | reply_ret_code = be32toh(reply_hdr.ret_code); |
| 322 | log_reply_code(reply_ret_code); |
| 323 | switch (reply_ret_code) { |
| 324 | case AGENT_RET_CODE_SUCCESS: |
| 325 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
| 326 | break; |
| 327 | default: |
| 328 | ret = LTTNG_ERR_UNK; |
| 329 | goto error; |
| 330 | } |
| 331 | |
| 332 | reply = zmalloc(data_size); |
| 333 | if (!reply) { |
| 334 | ret = LTTNG_ERR_NOMEM; |
| 335 | goto error; |
| 336 | } |
| 337 | |
| 338 | /* Get the list with the appropriate data size. */ |
| 339 | ret = recv_reply(app->sock, reply, data_size); |
| 340 | if (ret < 0) { |
| 341 | goto error_io; |
| 342 | } |
| 343 | |
| 344 | nb_event = be32toh(reply->nb_event); |
| 345 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); |
| 346 | if (!tmp_events) { |
| 347 | ret = LTTNG_ERR_NOMEM; |
| 348 | goto error; |
| 349 | } |
| 350 | |
| 351 | for (i = 0; i < nb_event; i++) { |
| 352 | offset += len; |
| 353 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
| 354 | sizeof(tmp_events[i].name))) { |
| 355 | ret = LTTNG_ERR_INVALID; |
| 356 | goto error; |
| 357 | } |
| 358 | tmp_events[i].pid = app->pid; |
| 359 | tmp_events[i].enabled = -1; |
| 360 | len = strlen(reply->payload + offset) + 1; |
| 361 | } |
| 362 | |
| 363 | *events = tmp_events; |
| 364 | |
| 365 | free(reply); |
| 366 | return nb_event; |
| 367 | |
| 368 | error_io: |
| 369 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 370 | error: |
| 371 | free(reply); |
| 372 | free(tmp_events); |
| 373 | return -ret; |
| 374 | |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Internal enable agent event on a agent application. This function |
| 379 | * communicates with the agent to enable a given event. |
| 380 | * |
| 381 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 382 | */ |
| 383 | static int enable_event(const struct agent_app *app, struct agent_event *event) |
| 384 | { |
| 385 | int ret; |
| 386 | char *bytes_to_send; |
| 387 | uint64_t data_size; |
| 388 | size_t filter_expression_length; |
| 389 | uint32_t reply_ret_code; |
| 390 | struct lttcomm_agent_enable_event msg; |
| 391 | struct lttcomm_agent_generic_reply reply; |
| 392 | |
| 393 | assert(app); |
| 394 | assert(app->sock); |
| 395 | assert(event); |
| 396 | |
| 397 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
| 398 | app->pid, app->sock->fd); |
| 399 | |
| 400 | /* |
| 401 | * Calculate the payload's size, which is the fixed-size struct followed |
| 402 | * by the variable-length filter expression (+1 for the ending \0). |
| 403 | */ |
| 404 | if (!event->filter_expression) { |
| 405 | filter_expression_length = 0; |
| 406 | } else { |
| 407 | filter_expression_length = strlen(event->filter_expression) + 1; |
| 408 | } |
| 409 | data_size = sizeof(msg) + filter_expression_length; |
| 410 | |
| 411 | memset(&msg, 0, sizeof(msg)); |
| 412 | msg.loglevel_value = htobe32(event->loglevel_value); |
| 413 | msg.loglevel_type = htobe32(event->loglevel_type); |
| 414 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
| 415 | ret = LTTNG_ERR_INVALID; |
| 416 | goto error; |
| 417 | } |
| 418 | msg.filter_expression_length = htobe32(filter_expression_length); |
| 419 | |
| 420 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
| 421 | if (ret < 0) { |
| 422 | goto error_io; |
| 423 | } |
| 424 | |
| 425 | bytes_to_send = zmalloc(data_size); |
| 426 | if (!bytes_to_send) { |
| 427 | ret = LTTNG_ERR_NOMEM; |
| 428 | goto error; |
| 429 | } |
| 430 | |
| 431 | memcpy(bytes_to_send, &msg, sizeof(msg)); |
| 432 | if (filter_expression_length > 0) { |
| 433 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, |
| 434 | filter_expression_length); |
| 435 | } |
| 436 | |
| 437 | ret = send_payload(app->sock, bytes_to_send, data_size); |
| 438 | free(bytes_to_send); |
| 439 | if (ret < 0) { |
| 440 | goto error_io; |
| 441 | } |
| 442 | |
| 443 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 444 | if (ret < 0) { |
| 445 | goto error_io; |
| 446 | } |
| 447 | |
| 448 | reply_ret_code = be32toh(reply.ret_code); |
| 449 | log_reply_code(reply_ret_code); |
| 450 | switch (reply_ret_code) { |
| 451 | case AGENT_RET_CODE_SUCCESS: |
| 452 | break; |
| 453 | case AGENT_RET_CODE_UNKNOWN_NAME: |
| 454 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 455 | goto error; |
| 456 | default: |
| 457 | ret = LTTNG_ERR_UNK; |
| 458 | goto error; |
| 459 | } |
| 460 | |
| 461 | return LTTNG_OK; |
| 462 | |
| 463 | error_io: |
| 464 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 465 | error: |
| 466 | return ret; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. |
| 471 | */ |
| 472 | static |
| 473 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) |
| 474 | { |
| 475 | int ret; |
| 476 | uint32_t len_be; |
| 477 | |
| 478 | len_be = htobe32(len); |
| 479 | ret = send_payload(sock, &len_be, sizeof(len_be)); |
| 480 | if (ret) { |
| 481 | goto end; |
| 482 | } |
| 483 | |
| 484 | ret = send_payload(sock, str, len); |
| 485 | if (ret) { |
| 486 | goto end; |
| 487 | } |
| 488 | end: |
| 489 | return ret; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Internal enable application context on an agent application. This function |
| 494 | * communicates with the agent to enable a given application context. |
| 495 | * |
| 496 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 497 | */ |
| 498 | static int app_context_op(const struct agent_app *app, |
| 499 | const struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) |
| 500 | { |
| 501 | int ret; |
| 502 | uint32_t reply_ret_code; |
| 503 | struct lttcomm_agent_generic_reply reply; |
| 504 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; |
| 505 | |
| 506 | assert(app); |
| 507 | assert(app->sock); |
| 508 | assert(ctx); |
| 509 | assert(cmd == AGENT_CMD_APP_CTX_ENABLE || |
| 510 | cmd == AGENT_CMD_APP_CTX_DISABLE); |
| 511 | |
| 512 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", |
| 513 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", |
| 514 | ctx->provider_name, ctx->ctx_name, |
| 515 | app->pid, app->sock->fd); |
| 516 | |
| 517 | /* |
| 518 | * Calculate the payload's size, which consists of the size (u32, BE) |
| 519 | * of the provider name, the NULL-terminated provider name string, the |
| 520 | * size (u32, BE) of the context name, followed by the NULL-terminated |
| 521 | * context name string. |
| 522 | */ |
| 523 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; |
| 524 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; |
| 525 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + |
| 526 | sizeof(uint32_t) + app_ctx_name_len; |
| 527 | |
| 528 | ret = send_header(app->sock, data_size, cmd, 0); |
| 529 | if (ret < 0) { |
| 530 | goto error_io; |
| 531 | } |
| 532 | |
| 533 | if (app_ctx_provider_name_len > UINT32_MAX || |
| 534 | app_ctx_name_len > UINT32_MAX) { |
| 535 | ERR("Application context name > MAX_UINT32"); |
| 536 | ret = LTTNG_ERR_INVALID; |
| 537 | goto error; |
| 538 | } |
| 539 | |
| 540 | ret = send_pstring(app->sock, ctx->provider_name, |
| 541 | (uint32_t) app_ctx_provider_name_len); |
| 542 | if (ret < 0) { |
| 543 | goto error_io; |
| 544 | } |
| 545 | |
| 546 | ret = send_pstring(app->sock, ctx->ctx_name, |
| 547 | (uint32_t) app_ctx_name_len); |
| 548 | if (ret < 0) { |
| 549 | goto error_io; |
| 550 | } |
| 551 | |
| 552 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 553 | if (ret < 0) { |
| 554 | goto error_io; |
| 555 | } |
| 556 | |
| 557 | reply_ret_code = be32toh(reply.ret_code); |
| 558 | log_reply_code(reply_ret_code); |
| 559 | switch (reply_ret_code) { |
| 560 | case AGENT_RET_CODE_SUCCESS: |
| 561 | break; |
| 562 | default: |
| 563 | ret = LTTNG_ERR_UNK; |
| 564 | goto error; |
| 565 | } |
| 566 | |
| 567 | return LTTNG_OK; |
| 568 | |
| 569 | error_io: |
| 570 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 571 | error: |
| 572 | return ret; |
| 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Internal disable agent event call on a agent application. This function |
| 577 | * communicates with the agent to disable a given event. |
| 578 | * |
| 579 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 580 | */ |
| 581 | static int disable_event(struct agent_app *app, struct agent_event *event) |
| 582 | { |
| 583 | int ret; |
| 584 | uint64_t data_size; |
| 585 | uint32_t reply_ret_code; |
| 586 | struct lttcomm_agent_disable_event msg; |
| 587 | struct lttcomm_agent_generic_reply reply; |
| 588 | |
| 589 | assert(app); |
| 590 | assert(app->sock); |
| 591 | assert(event); |
| 592 | |
| 593 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
| 594 | app->pid, app->sock->fd); |
| 595 | |
| 596 | data_size = sizeof(msg); |
| 597 | memset(&msg, 0, sizeof(msg)); |
| 598 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
| 599 | ret = LTTNG_ERR_INVALID; |
| 600 | goto error; |
| 601 | } |
| 602 | |
| 603 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
| 604 | if (ret < 0) { |
| 605 | goto error_io; |
| 606 | } |
| 607 | |
| 608 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
| 609 | if (ret < 0) { |
| 610 | goto error_io; |
| 611 | } |
| 612 | |
| 613 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 614 | if (ret < 0) { |
| 615 | goto error_io; |
| 616 | } |
| 617 | |
| 618 | reply_ret_code = be32toh(reply.ret_code); |
| 619 | log_reply_code(reply_ret_code); |
| 620 | switch (reply_ret_code) { |
| 621 | case AGENT_RET_CODE_SUCCESS: |
| 622 | break; |
| 623 | case AGENT_RET_CODE_UNKNOWN_NAME: |
| 624 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 625 | goto error; |
| 626 | default: |
| 627 | ret = LTTNG_ERR_UNK; |
| 628 | goto error; |
| 629 | } |
| 630 | |
| 631 | return LTTNG_OK; |
| 632 | |
| 633 | error_io: |
| 634 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 635 | error: |
| 636 | return ret; |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Send back the registration DONE command to a given agent application. |
| 641 | * |
| 642 | * Return 0 on success or else a negative value. |
| 643 | */ |
| 644 | int agent_send_registration_done(struct agent_app *app) |
| 645 | { |
| 646 | assert(app); |
| 647 | assert(app->sock); |
| 648 | |
| 649 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
| 650 | |
| 651 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * Enable agent event on every agent applications registered with the session |
| 656 | * daemon. |
| 657 | * |
| 658 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 659 | */ |
| 660 | int agent_enable_event(struct agent_event *event, |
| 661 | enum lttng_domain_type domain) |
| 662 | { |
| 663 | int ret; |
| 664 | struct agent_app *app; |
| 665 | struct lttng_ht_iter iter; |
| 666 | |
| 667 | assert(event); |
| 668 | |
| 669 | rcu_read_lock(); |
| 670 | |
| 671 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 672 | node.node) { |
| 673 | if (app->domain != domain) { |
| 674 | continue; |
| 675 | } |
| 676 | |
| 677 | /* Enable event on agent application through TCP socket. */ |
| 678 | ret = enable_event(app, event); |
| 679 | if (ret != LTTNG_OK) { |
| 680 | goto error; |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | event->enabled = 1; |
| 685 | ret = LTTNG_OK; |
| 686 | |
| 687 | error: |
| 688 | rcu_read_unlock(); |
| 689 | return ret; |
| 690 | } |
| 691 | |
| 692 | static |
| 693 | void destroy_app_ctx(struct agent_app_ctx *ctx) |
| 694 | { |
| 695 | free(ctx->provider_name); |
| 696 | free(ctx->ctx_name); |
| 697 | free(ctx); |
| 698 | } |
| 699 | |
| 700 | static |
| 701 | struct agent_app_ctx *create_app_ctx(const struct lttng_event_context *ctx) |
| 702 | { |
| 703 | struct agent_app_ctx *agent_ctx = NULL; |
| 704 | |
| 705 | if (!ctx) { |
| 706 | goto end; |
| 707 | } |
| 708 | |
| 709 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 710 | agent_ctx = zmalloc(sizeof(*ctx)); |
| 711 | if (!agent_ctx) { |
| 712 | goto end; |
| 713 | } |
| 714 | |
| 715 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); |
| 716 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); |
| 717 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { |
| 718 | destroy_app_ctx(agent_ctx); |
| 719 | agent_ctx = NULL; |
| 720 | } |
| 721 | end: |
| 722 | return agent_ctx; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Enable agent context on every agent applications registered with the session |
| 727 | * daemon. |
| 728 | * |
| 729 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 730 | */ |
| 731 | int agent_enable_context(const struct lttng_event_context *ctx, |
| 732 | enum lttng_domain_type domain) |
| 733 | { |
| 734 | int ret; |
| 735 | struct agent_app *app; |
| 736 | struct lttng_ht_iter iter; |
| 737 | |
| 738 | assert(ctx); |
| 739 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 740 | ret = LTTNG_ERR_INVALID; |
| 741 | goto error; |
| 742 | } |
| 743 | |
| 744 | rcu_read_lock(); |
| 745 | |
| 746 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 747 | node.node) { |
| 748 | struct agent_app_ctx *agent_ctx; |
| 749 | |
| 750 | if (app->domain != domain) { |
| 751 | continue; |
| 752 | } |
| 753 | |
| 754 | agent_ctx = create_app_ctx(ctx); |
| 755 | if (!agent_ctx) { |
| 756 | ret = LTTNG_ERR_NOMEM; |
| 757 | goto error_unlock; |
| 758 | } |
| 759 | |
| 760 | /* Enable event on agent application through TCP socket. */ |
| 761 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); |
| 762 | destroy_app_ctx(agent_ctx); |
| 763 | if (ret != LTTNG_OK) { |
| 764 | goto error_unlock; |
| 765 | } |
| 766 | } |
| 767 | |
| 768 | ret = LTTNG_OK; |
| 769 | |
| 770 | error_unlock: |
| 771 | rcu_read_unlock(); |
| 772 | error: |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | /* |
| 777 | * Disable agent event on every agent application registered with the session |
| 778 | * daemon. |
| 779 | * |
| 780 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 781 | */ |
| 782 | int agent_disable_event(struct agent_event *event, |
| 783 | enum lttng_domain_type domain) |
| 784 | { |
| 785 | int ret = LTTNG_OK; |
| 786 | struct agent_app *app; |
| 787 | struct lttng_ht_iter iter; |
| 788 | |
| 789 | assert(event); |
| 790 | if (!event->enabled) { |
| 791 | goto end; |
| 792 | } |
| 793 | |
| 794 | rcu_read_lock(); |
| 795 | |
| 796 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 797 | node.node) { |
| 798 | if (app->domain != domain) { |
| 799 | continue; |
| 800 | } |
| 801 | |
| 802 | /* Enable event on agent application through TCP socket. */ |
| 803 | ret = disable_event(app, event); |
| 804 | if (ret != LTTNG_OK) { |
| 805 | goto error; |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | event->enabled = 0; |
| 810 | |
| 811 | error: |
| 812 | rcu_read_unlock(); |
| 813 | end: |
| 814 | return ret; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Disable agent context on every agent application registered with the session |
| 819 | * daemon. |
| 820 | * |
| 821 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 822 | */ |
| 823 | static int disable_context(struct agent_app_ctx *ctx, |
| 824 | enum lttng_domain_type domain) |
| 825 | { |
| 826 | int ret = LTTNG_OK; |
| 827 | struct agent_app *app; |
| 828 | struct lttng_ht_iter iter; |
| 829 | |
| 830 | assert(ctx); |
| 831 | |
| 832 | rcu_read_lock(); |
| 833 | DBG2("Disabling agent application context %s:%s", |
| 834 | ctx->provider_name, ctx->ctx_name); |
| 835 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 836 | node.node) { |
| 837 | if (app->domain != domain) { |
| 838 | continue; |
| 839 | } |
| 840 | |
| 841 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); |
| 842 | if (ret != LTTNG_OK) { |
| 843 | goto end; |
| 844 | } |
| 845 | } |
| 846 | end: |
| 847 | rcu_read_unlock(); |
| 848 | return ret; |
| 849 | } |
| 850 | |
| 851 | /* |
| 852 | * Ask every agent for the list of possible event. Events is allocated with the |
| 853 | * events of every agent application. |
| 854 | * |
| 855 | * Return the number of events or else a negative value. |
| 856 | */ |
| 857 | int agent_list_events(struct lttng_event **events, |
| 858 | enum lttng_domain_type domain) |
| 859 | { |
| 860 | int ret; |
| 861 | size_t nbmem, count = 0; |
| 862 | struct agent_app *app; |
| 863 | struct lttng_event *tmp_events = NULL; |
| 864 | struct lttng_ht_iter iter; |
| 865 | |
| 866 | assert(events); |
| 867 | |
| 868 | DBG2("Agent listing events for domain %d", domain); |
| 869 | |
| 870 | nbmem = UST_APP_EVENT_LIST_SIZE; |
| 871 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); |
| 872 | if (!tmp_events) { |
| 873 | PERROR("zmalloc agent list events"); |
| 874 | ret = -ENOMEM; |
| 875 | goto error; |
| 876 | } |
| 877 | |
| 878 | rcu_read_lock(); |
| 879 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 880 | node.node) { |
| 881 | ssize_t nb_ev; |
| 882 | struct lttng_event *agent_events; |
| 883 | |
| 884 | /* Skip domain not asked by the list. */ |
| 885 | if (app->domain != domain) { |
| 886 | continue; |
| 887 | } |
| 888 | |
| 889 | nb_ev = list_events(app, &agent_events); |
| 890 | if (nb_ev < 0) { |
| 891 | ret = nb_ev; |
| 892 | goto error_unlock; |
| 893 | } |
| 894 | |
| 895 | if (count + nb_ev > nbmem) { |
| 896 | /* In case the realloc fails, we free the memory */ |
| 897 | struct lttng_event *new_tmp_events; |
| 898 | size_t new_nbmem; |
| 899 | |
| 900 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); |
| 901 | DBG2("Reallocating agent event list from %zu to %zu entries", |
| 902 | nbmem, new_nbmem); |
| 903 | new_tmp_events = realloc(tmp_events, |
| 904 | new_nbmem * sizeof(*new_tmp_events)); |
| 905 | if (!new_tmp_events) { |
| 906 | PERROR("realloc agent events"); |
| 907 | ret = -ENOMEM; |
| 908 | free(agent_events); |
| 909 | goto error_unlock; |
| 910 | } |
| 911 | /* Zero the new memory */ |
| 912 | memset(new_tmp_events + nbmem, 0, |
| 913 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); |
| 914 | nbmem = new_nbmem; |
| 915 | tmp_events = new_tmp_events; |
| 916 | } |
| 917 | memcpy(tmp_events + count, agent_events, |
| 918 | nb_ev * sizeof(*tmp_events)); |
| 919 | free(agent_events); |
| 920 | count += nb_ev; |
| 921 | } |
| 922 | rcu_read_unlock(); |
| 923 | |
| 924 | ret = count; |
| 925 | *events = tmp_events; |
| 926 | return ret; |
| 927 | |
| 928 | error_unlock: |
| 929 | rcu_read_unlock(); |
| 930 | error: |
| 931 | free(tmp_events); |
| 932 | return ret; |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * Create a agent app object using the given PID. |
| 937 | * |
| 938 | * Return newly allocated object or else NULL on error. |
| 939 | */ |
| 940 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
| 941 | struct lttcomm_sock *sock) |
| 942 | { |
| 943 | struct agent_app *app; |
| 944 | |
| 945 | assert(sock); |
| 946 | |
| 947 | app = zmalloc(sizeof(*app)); |
| 948 | if (!app) { |
| 949 | PERROR("Failed to allocate agent application instance"); |
| 950 | goto error; |
| 951 | } |
| 952 | |
| 953 | app->pid = pid; |
| 954 | app->domain = domain; |
| 955 | app->sock = sock; |
| 956 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
| 957 | |
| 958 | error: |
| 959 | return app; |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * Lookup agent app by socket in the global hash table. |
| 964 | * |
| 965 | * RCU read side lock MUST be acquired. |
| 966 | * |
| 967 | * Return object if found else NULL. |
| 968 | */ |
| 969 | struct agent_app *agent_find_app_by_sock(int sock) |
| 970 | { |
| 971 | struct lttng_ht_node_ulong *node; |
| 972 | struct lttng_ht_iter iter; |
| 973 | struct agent_app *app; |
| 974 | |
| 975 | assert(sock >= 0); |
| 976 | |
| 977 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
| 978 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 979 | if (node == NULL) { |
| 980 | goto error; |
| 981 | } |
| 982 | app = caa_container_of(node, struct agent_app, node); |
| 983 | |
| 984 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
| 985 | return app; |
| 986 | |
| 987 | error: |
| 988 | DBG3("Agent app NOT found by sock %d.", sock); |
| 989 | return NULL; |
| 990 | } |
| 991 | |
| 992 | /* |
| 993 | * Add agent application object to the global hash table. |
| 994 | */ |
| 995 | void agent_add_app(struct agent_app *app) |
| 996 | { |
| 997 | assert(app); |
| 998 | |
| 999 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
| 1000 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Delete agent application from the global hash table. |
| 1005 | * |
| 1006 | * rcu_read_lock() must be held by the caller. |
| 1007 | */ |
| 1008 | void agent_delete_app(struct agent_app *app) |
| 1009 | { |
| 1010 | int ret; |
| 1011 | struct lttng_ht_iter iter; |
| 1012 | |
| 1013 | assert(app); |
| 1014 | |
| 1015 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
| 1016 | |
| 1017 | iter.iter.node = &app->node.node; |
| 1018 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
| 1019 | assert(!ret); |
| 1020 | } |
| 1021 | |
| 1022 | /* |
| 1023 | * Destroy an agent application object by detaching it from its corresponding |
| 1024 | * UST app if one is connected by closing the socket. Finally, perform a |
| 1025 | * delayed memory reclaim. |
| 1026 | */ |
| 1027 | void agent_destroy_app(struct agent_app *app) |
| 1028 | { |
| 1029 | assert(app); |
| 1030 | |
| 1031 | if (app->sock) { |
| 1032 | app->sock->ops->close(app->sock); |
| 1033 | lttcomm_destroy_sock(app->sock); |
| 1034 | } |
| 1035 | |
| 1036 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * Initialize an already allocated agent object. |
| 1041 | * |
| 1042 | * Return 0 on success or else a negative errno value. |
| 1043 | */ |
| 1044 | int agent_init(struct agent *agt) |
| 1045 | { |
| 1046 | int ret; |
| 1047 | |
| 1048 | assert(agt); |
| 1049 | |
| 1050 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 1051 | if (!agt->events) { |
| 1052 | ret = -ENOMEM; |
| 1053 | goto error; |
| 1054 | } |
| 1055 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
| 1056 | |
| 1057 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
| 1058 | return 0; |
| 1059 | |
| 1060 | error: |
| 1061 | return ret; |
| 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * Add agent object to the given hash table. |
| 1066 | */ |
| 1067 | void agent_add(struct agent *agt, struct lttng_ht *ht) |
| 1068 | { |
| 1069 | assert(agt); |
| 1070 | assert(ht); |
| 1071 | |
| 1072 | DBG3("Agent adding from domain %d", agt->domain); |
| 1073 | |
| 1074 | lttng_ht_add_unique_u64(ht, &agt->node); |
| 1075 | } |
| 1076 | |
| 1077 | /* |
| 1078 | * Create an agent object for the given domain. |
| 1079 | * |
| 1080 | * Return the allocated agent or NULL on error. |
| 1081 | */ |
| 1082 | struct agent *agent_create(enum lttng_domain_type domain) |
| 1083 | { |
| 1084 | int ret; |
| 1085 | struct agent *agt; |
| 1086 | |
| 1087 | agt = zmalloc(sizeof(struct agent)); |
| 1088 | if (!agt) { |
| 1089 | goto error; |
| 1090 | } |
| 1091 | agt->domain = domain; |
| 1092 | |
| 1093 | ret = agent_init(agt); |
| 1094 | if (ret < 0) { |
| 1095 | free(agt); |
| 1096 | agt = NULL; |
| 1097 | goto error; |
| 1098 | } |
| 1099 | |
| 1100 | error: |
| 1101 | return agt; |
| 1102 | } |
| 1103 | |
| 1104 | /* |
| 1105 | * Create a newly allocated agent event data structure. |
| 1106 | * Ownership of filter_expression is taken. |
| 1107 | * |
| 1108 | * Return a new object else NULL on error. |
| 1109 | */ |
| 1110 | struct agent_event *agent_create_event(const char *name, |
| 1111 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
| 1112 | struct lttng_filter_bytecode *filter, char *filter_expression) |
| 1113 | { |
| 1114 | struct agent_event *event = NULL; |
| 1115 | |
| 1116 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
| 1117 | loglevel value %d and filter %s", |
| 1118 | name, loglevel_type, loglevel_value, |
| 1119 | filter_expression ? filter_expression : "NULL"); |
| 1120 | |
| 1121 | if (!name) { |
| 1122 | ERR("Failed to create agent event; no name provided."); |
| 1123 | goto error; |
| 1124 | } |
| 1125 | |
| 1126 | event = zmalloc(sizeof(*event)); |
| 1127 | if (!event) { |
| 1128 | goto error; |
| 1129 | } |
| 1130 | |
| 1131 | strncpy(event->name, name, sizeof(event->name)); |
| 1132 | event->name[sizeof(event->name) - 1] = '\0'; |
| 1133 | lttng_ht_node_init_str(&event->node, event->name); |
| 1134 | |
| 1135 | event->loglevel_value = loglevel_value; |
| 1136 | event->loglevel_type = loglevel_type; |
| 1137 | event->filter = filter; |
| 1138 | event->filter_expression = filter_expression; |
| 1139 | error: |
| 1140 | return event; |
| 1141 | } |
| 1142 | |
| 1143 | /* |
| 1144 | * Unique add of a agent event to an agent object. |
| 1145 | */ |
| 1146 | void agent_add_event(struct agent_event *event, struct agent *agt) |
| 1147 | { |
| 1148 | assert(event); |
| 1149 | assert(agt); |
| 1150 | assert(agt->events); |
| 1151 | |
| 1152 | DBG3("Agent adding event %s", event->name); |
| 1153 | add_unique_agent_event(agt->events, event); |
| 1154 | agt->being_used = 1; |
| 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * Unique add of a agent context to an agent object. |
| 1159 | */ |
| 1160 | int agent_add_context(const struct lttng_event_context *ctx, struct agent *agt) |
| 1161 | { |
| 1162 | int ret = LTTNG_OK; |
| 1163 | struct agent_app_ctx *agent_ctx = NULL; |
| 1164 | |
| 1165 | assert(ctx); |
| 1166 | assert(agt); |
| 1167 | assert(agt->events); |
| 1168 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 1169 | |
| 1170 | agent_ctx = create_app_ctx(ctx); |
| 1171 | if (!agent_ctx) { |
| 1172 | ret = LTTNG_ERR_NOMEM; |
| 1173 | goto end; |
| 1174 | } |
| 1175 | |
| 1176 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, |
| 1177 | ctx->u.app_ctx.ctx_name); |
| 1178 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); |
| 1179 | end: |
| 1180 | return ret; |
| 1181 | } |
| 1182 | |
| 1183 | /* |
| 1184 | * Find multiple agent events sharing the given name. |
| 1185 | * |
| 1186 | * RCU read side lock MUST be acquired. It must be held for the |
| 1187 | * duration of the iteration. |
| 1188 | * |
| 1189 | * Sets the given iterator. |
| 1190 | */ |
| 1191 | void agent_find_events_by_name(const char *name, struct agent *agt, |
| 1192 | struct lttng_ht_iter* iter) |
| 1193 | { |
| 1194 | struct lttng_ht *ht; |
| 1195 | struct agent_ht_key key; |
| 1196 | |
| 1197 | assert(name); |
| 1198 | assert(agt); |
| 1199 | assert(agt->events); |
| 1200 | assert(iter); |
| 1201 | |
| 1202 | ht = agt->events; |
| 1203 | key.name = name; |
| 1204 | |
| 1205 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 1206 | ht_match_event_by_name, &key, &iter->iter); |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * Get the next agent event duplicate by name. This should be called |
| 1211 | * after a call to agent_find_events_by_name() to iterate on events. |
| 1212 | * |
| 1213 | * The RCU read lock must be held during the iteration and for as long |
| 1214 | * as the object the iterator points to remains in use. |
| 1215 | */ |
| 1216 | void agent_event_next_duplicate(const char *name, |
| 1217 | struct agent *agt, struct lttng_ht_iter* iter) |
| 1218 | { |
| 1219 | struct agent_ht_key key; |
| 1220 | |
| 1221 | key.name = name; |
| 1222 | |
| 1223 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, |
| 1224 | &key, &iter->iter); |
| 1225 | } |
| 1226 | |
| 1227 | /* |
| 1228 | * Find a agent event in the given agent using name, loglevel and filter. |
| 1229 | * |
| 1230 | * RCU read side lock MUST be acquired. It must be kept for as long as |
| 1231 | * the returned agent_event is used. |
| 1232 | * |
| 1233 | * Return object if found else NULL. |
| 1234 | */ |
| 1235 | struct agent_event *agent_find_event(const char *name, |
| 1236 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
| 1237 | char *filter_expression, struct agent *agt) |
| 1238 | { |
| 1239 | struct lttng_ht_node_str *node; |
| 1240 | struct lttng_ht_iter iter; |
| 1241 | struct lttng_ht *ht; |
| 1242 | struct agent_ht_key key; |
| 1243 | |
| 1244 | assert(name); |
| 1245 | assert(agt); |
| 1246 | assert(agt->events); |
| 1247 | |
| 1248 | ht = agt->events; |
| 1249 | key.name = name; |
| 1250 | key.loglevel_value = loglevel_value; |
| 1251 | key.loglevel_type = loglevel_type; |
| 1252 | key.filter_expression = filter_expression; |
| 1253 | |
| 1254 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 1255 | ht_match_event, &key, &iter.iter); |
| 1256 | node = lttng_ht_iter_get_node_str(&iter); |
| 1257 | if (node == NULL) { |
| 1258 | goto error; |
| 1259 | } |
| 1260 | |
| 1261 | DBG3("Agent event found %s.", name); |
| 1262 | return caa_container_of(node, struct agent_event, node); |
| 1263 | |
| 1264 | error: |
| 1265 | DBG3("Agent event NOT found %s.", name); |
| 1266 | return NULL; |
| 1267 | } |
| 1268 | |
| 1269 | /* |
| 1270 | * Free given agent event. This event must not be globally visible at this |
| 1271 | * point (only expected to be used on failure just after event creation). After |
| 1272 | * this call, the pointer is not usable anymore. |
| 1273 | */ |
| 1274 | void agent_destroy_event(struct agent_event *event) |
| 1275 | { |
| 1276 | assert(event); |
| 1277 | |
| 1278 | free(event->filter); |
| 1279 | free(event->filter_expression); |
| 1280 | free(event->exclusion); |
| 1281 | free(event); |
| 1282 | } |
| 1283 | |
| 1284 | static |
| 1285 | void destroy_app_ctx_rcu(struct rcu_head *head) |
| 1286 | { |
| 1287 | struct agent_app_ctx *ctx = |
| 1288 | caa_container_of(head, struct agent_app_ctx, rcu_node); |
| 1289 | |
| 1290 | destroy_app_ctx(ctx); |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * Destroy an agent completely. |
| 1295 | */ |
| 1296 | void agent_destroy(struct agent *agt) |
| 1297 | { |
| 1298 | struct lttng_ht_node_str *node; |
| 1299 | struct lttng_ht_iter iter; |
| 1300 | struct agent_app_ctx *ctx; |
| 1301 | |
| 1302 | assert(agt); |
| 1303 | |
| 1304 | DBG3("Agent destroy"); |
| 1305 | |
| 1306 | rcu_read_lock(); |
| 1307 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
| 1308 | int ret; |
| 1309 | struct agent_event *event; |
| 1310 | |
| 1311 | /* |
| 1312 | * When destroying an event, we have to try to disable it on the |
| 1313 | * agent side so the event stops generating data. The return |
| 1314 | * value is not important since we have to continue anyway |
| 1315 | * destroying the object. |
| 1316 | */ |
| 1317 | event = caa_container_of(node, struct agent_event, node); |
| 1318 | (void) agent_disable_event(event, agt->domain); |
| 1319 | |
| 1320 | ret = lttng_ht_del(agt->events, &iter); |
| 1321 | assert(!ret); |
| 1322 | call_rcu(&node->head, destroy_event_agent_rcu); |
| 1323 | } |
| 1324 | |
| 1325 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
| 1326 | (void) disable_context(ctx, agt->domain); |
| 1327 | cds_list_del(&ctx->list_node); |
| 1328 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); |
| 1329 | } |
| 1330 | rcu_read_unlock(); |
| 1331 | ht_cleanup_push(agt->events); |
| 1332 | free(agt); |
| 1333 | } |
| 1334 | |
| 1335 | /* |
| 1336 | * Allocate agent_apps_ht_by_sock. |
| 1337 | */ |
| 1338 | int agent_app_ht_alloc(void) |
| 1339 | { |
| 1340 | int ret = 0; |
| 1341 | |
| 1342 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1343 | if (!agent_apps_ht_by_sock) { |
| 1344 | ret = -1; |
| 1345 | } |
| 1346 | |
| 1347 | return ret; |
| 1348 | } |
| 1349 | |
| 1350 | /* |
| 1351 | * Destroy a agent application by socket. |
| 1352 | */ |
| 1353 | void agent_destroy_app_by_sock(int sock) |
| 1354 | { |
| 1355 | struct agent_app *app; |
| 1356 | |
| 1357 | assert(sock >= 0); |
| 1358 | |
| 1359 | /* |
| 1360 | * Not finding an application is a very important error that should NEVER |
| 1361 | * happen. The hash table deletion is ONLY done through this call when the |
| 1362 | * main sessiond thread is torn down. |
| 1363 | */ |
| 1364 | rcu_read_lock(); |
| 1365 | app = agent_find_app_by_sock(sock); |
| 1366 | assert(app); |
| 1367 | |
| 1368 | /* RCU read side lock is assumed to be held by this function. */ |
| 1369 | agent_delete_app(app); |
| 1370 | |
| 1371 | /* The application is freed in a RCU call but the socket is closed here. */ |
| 1372 | agent_destroy_app(app); |
| 1373 | rcu_read_unlock(); |
| 1374 | } |
| 1375 | |
| 1376 | /* |
| 1377 | * Clean-up the agent app hash table and destroy it. |
| 1378 | */ |
| 1379 | void agent_app_ht_clean(void) |
| 1380 | { |
| 1381 | struct lttng_ht_node_ulong *node; |
| 1382 | struct lttng_ht_iter iter; |
| 1383 | |
| 1384 | if (!agent_apps_ht_by_sock) { |
| 1385 | return; |
| 1386 | } |
| 1387 | rcu_read_lock(); |
| 1388 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { |
| 1389 | struct agent_app *app; |
| 1390 | |
| 1391 | app = caa_container_of(node, struct agent_app, node); |
| 1392 | agent_destroy_app_by_sock(app->sock->fd); |
| 1393 | } |
| 1394 | rcu_read_unlock(); |
| 1395 | |
| 1396 | lttng_ht_destroy(agent_apps_ht_by_sock); |
| 1397 | } |
| 1398 | |
| 1399 | /* |
| 1400 | * Update a agent application (given socket) using the given agent. |
| 1401 | * |
| 1402 | * Note that this function is most likely to be used with a tracing session |
| 1403 | * thus the caller should make sure to hold the appropriate lock(s). |
| 1404 | */ |
| 1405 | void agent_update(const struct agent *agt, const struct agent_app *app) |
| 1406 | { |
| 1407 | int ret; |
| 1408 | struct agent_event *event; |
| 1409 | struct lttng_ht_iter iter; |
| 1410 | struct agent_app_ctx *ctx; |
| 1411 | |
| 1412 | assert(agt); |
| 1413 | assert(app); |
| 1414 | |
| 1415 | DBG("Agent updating app: pid = %ld", (long) app->pid); |
| 1416 | |
| 1417 | rcu_read_lock(); |
| 1418 | /* |
| 1419 | * We are in the registration path thus if the application is gone, |
| 1420 | * there is a serious code flow error. |
| 1421 | */ |
| 1422 | |
| 1423 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
| 1424 | /* Skip event if disabled. */ |
| 1425 | if (!event->enabled) { |
| 1426 | continue; |
| 1427 | } |
| 1428 | |
| 1429 | ret = enable_event(app, event); |
| 1430 | if (ret != LTTNG_OK) { |
| 1431 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
| 1432 | event->name, app->pid, app->sock->fd); |
| 1433 | /* Let's try the others here and don't assume the app is dead. */ |
| 1434 | continue; |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
| 1439 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); |
| 1440 | if (ret != LTTNG_OK) { |
| 1441 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", |
| 1442 | ctx->provider_name, ctx->ctx_name, |
| 1443 | app->pid, app->sock->fd); |
| 1444 | continue; |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | rcu_read_unlock(); |
| 1449 | } |