| 1 | /* |
| 2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> |
| 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License, version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _LGPL_SOURCE |
| 20 | #include <assert.h> |
| 21 | #include <urcu/uatomic.h> |
| 22 | #include <urcu/rculist.h> |
| 23 | |
| 24 | #include <common/common.h> |
| 25 | #include <common/sessiond-comm/agent.h> |
| 26 | |
| 27 | #include <common/compat/endian.h> |
| 28 | |
| 29 | #include "agent.h" |
| 30 | #include "ust-app.h" |
| 31 | #include "utils.h" |
| 32 | #include "error.h" |
| 33 | |
| 34 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) |
| 35 | |
| 36 | /* |
| 37 | * Agent application context representation. |
| 38 | */ |
| 39 | struct agent_app_ctx { |
| 40 | char *provider_name; |
| 41 | char *ctx_name; |
| 42 | |
| 43 | /* agent_app_ctx are part of the agent app_ctx_list. */ |
| 44 | struct cds_list_head list_node; |
| 45 | |
| 46 | /* For call_rcu teardown. */ |
| 47 | struct rcu_head rcu_node; |
| 48 | }; |
| 49 | |
| 50 | /* |
| 51 | * Human readable agent return code. |
| 52 | */ |
| 53 | static const char *error_string_array[] = { |
| 54 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", |
| 55 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", |
| 56 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", |
| 57 | |
| 58 | /* Last element */ |
| 59 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", |
| 60 | }; |
| 61 | |
| 62 | static |
| 63 | void log_reply_code(uint32_t in_reply_ret_code) |
| 64 | { |
| 65 | int level = PRINT_DBG3; |
| 66 | /* |
| 67 | * reply_ret_code and in_reply_ret_code are kept separate to have a |
| 68 | * sanitized value (used to retrieve the human readable string) and the |
| 69 | * original value which is logged as-is. |
| 70 | */ |
| 71 | uint32_t reply_ret_code = in_reply_ret_code; |
| 72 | |
| 73 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || |
| 74 | reply_ret_code >= AGENT_RET_CODE_NR) { |
| 75 | reply_ret_code = AGENT_RET_CODE_NR; |
| 76 | level = PRINT_ERR; |
| 77 | } |
| 78 | |
| 79 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", |
| 80 | error_string_array[AGENT_RET_CODE_INDEX( |
| 81 | reply_ret_code)], |
| 82 | in_reply_ret_code); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Match function for the events hash table lookup by name. |
| 87 | */ |
| 88 | static int ht_match_event_by_name(struct cds_lfht_node *node, |
| 89 | const void *_key) |
| 90 | { |
| 91 | struct agent_event *event; |
| 92 | const struct agent_ht_key *key; |
| 93 | |
| 94 | assert(node); |
| 95 | assert(_key); |
| 96 | |
| 97 | event = caa_container_of(node, struct agent_event, node.node); |
| 98 | key = _key; |
| 99 | |
| 100 | /* Match 1 elements of the key: name. */ |
| 101 | |
| 102 | /* Event name */ |
| 103 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { |
| 104 | goto no_match; |
| 105 | } |
| 106 | /* Match. */ |
| 107 | return 1; |
| 108 | |
| 109 | no_match: |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Match function for the events hash table lookup by name and loglevel. |
| 115 | */ |
| 116 | static int ht_match_event(struct cds_lfht_node *node, |
| 117 | const void *_key) |
| 118 | { |
| 119 | struct agent_event *event; |
| 120 | const struct agent_ht_key *key; |
| 121 | int ll_match; |
| 122 | |
| 123 | assert(node); |
| 124 | assert(_key); |
| 125 | |
| 126 | event = caa_container_of(node, struct agent_event, node.node); |
| 127 | key = _key; |
| 128 | |
| 129 | /* Match 2 elements of the key: name and loglevel. */ |
| 130 | |
| 131 | /* Event name */ |
| 132 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { |
| 133 | goto no_match; |
| 134 | } |
| 135 | |
| 136 | /* Event loglevel value and type. */ |
| 137 | ll_match = loglevels_match(event->loglevel_type, |
| 138 | event->loglevel_value, key->loglevel_type, |
| 139 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); |
| 140 | |
| 141 | if (!ll_match) { |
| 142 | goto no_match; |
| 143 | } |
| 144 | |
| 145 | /* Filter expression */ |
| 146 | if (strncmp(event->filter_expression, key->filter_expression, |
| 147 | strlen(event->filter_expression)) != 0) { |
| 148 | goto no_match; |
| 149 | } |
| 150 | |
| 151 | return 1; |
| 152 | |
| 153 | no_match: |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Add unique agent event based on the event name and loglevel. |
| 159 | */ |
| 160 | static void add_unique_agent_event(struct lttng_ht *ht, |
| 161 | struct agent_event *event) |
| 162 | { |
| 163 | struct cds_lfht_node *node_ptr; |
| 164 | struct agent_ht_key key; |
| 165 | |
| 166 | assert(ht); |
| 167 | assert(ht->ht); |
| 168 | assert(event); |
| 169 | |
| 170 | key.name = event->name; |
| 171 | key.loglevel_value = event->loglevel_value; |
| 172 | key.loglevel_type = event->loglevel_type; |
| 173 | key.filter_expression = event->filter_expression; |
| 174 | |
| 175 | node_ptr = cds_lfht_add_unique(ht->ht, |
| 176 | ht->hash_fct(event->node.key, lttng_ht_seed), |
| 177 | ht_match_event, &key, &event->node.node); |
| 178 | assert(node_ptr == &event->node.node); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * URCU delayed agent event reclaim. |
| 183 | */ |
| 184 | static void destroy_event_agent_rcu(struct rcu_head *head) |
| 185 | { |
| 186 | struct lttng_ht_node_str *node = |
| 187 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 188 | struct agent_event *event = |
| 189 | caa_container_of(node, struct agent_event, node); |
| 190 | |
| 191 | agent_destroy_event(event); |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * URCU delayed agent app reclaim. |
| 196 | */ |
| 197 | static void destroy_app_agent_rcu(struct rcu_head *head) |
| 198 | { |
| 199 | struct lttng_ht_node_ulong *node = |
| 200 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 201 | struct agent_app *app = |
| 202 | caa_container_of(node, struct agent_app, node); |
| 203 | |
| 204 | free(app); |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Communication with the agent. Send the message header to the given socket in |
| 209 | * big endian. |
| 210 | * |
| 211 | * Return 0 on success or else a negative errno message of sendmsg() op. |
| 212 | */ |
| 213 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, |
| 214 | uint32_t cmd, uint32_t cmd_version) |
| 215 | { |
| 216 | int ret; |
| 217 | ssize_t size; |
| 218 | struct lttcomm_agent_hdr msg; |
| 219 | |
| 220 | assert(sock); |
| 221 | |
| 222 | memset(&msg, 0, sizeof(msg)); |
| 223 | msg.data_size = htobe64(data_size); |
| 224 | msg.cmd = htobe32(cmd); |
| 225 | msg.cmd_version = htobe32(cmd_version); |
| 226 | |
| 227 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); |
| 228 | if (size < sizeof(msg)) { |
| 229 | ret = -errno; |
| 230 | goto error; |
| 231 | } |
| 232 | ret = 0; |
| 233 | |
| 234 | error: |
| 235 | return ret; |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * Communication call with the agent. Send the payload to the given socket. The |
| 240 | * header MUST be sent prior to this call. |
| 241 | * |
| 242 | * Return 0 on success or else a negative errno value of sendmsg() op. |
| 243 | */ |
| 244 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
| 245 | size_t size) |
| 246 | { |
| 247 | int ret; |
| 248 | ssize_t len; |
| 249 | |
| 250 | assert(sock); |
| 251 | assert(data); |
| 252 | |
| 253 | len = sock->ops->sendmsg(sock, data, size, 0); |
| 254 | if (len < size) { |
| 255 | ret = -errno; |
| 256 | goto error; |
| 257 | } |
| 258 | ret = 0; |
| 259 | |
| 260 | error: |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Communication call with the agent. Receive reply from the agent using the |
| 266 | * given socket. |
| 267 | * |
| 268 | * Return 0 on success or else a negative errno value from recvmsg() op. |
| 269 | */ |
| 270 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) |
| 271 | { |
| 272 | int ret; |
| 273 | ssize_t len; |
| 274 | |
| 275 | assert(sock); |
| 276 | assert(buf); |
| 277 | |
| 278 | len = sock->ops->recvmsg(sock, buf, size, 0); |
| 279 | if (len < size) { |
| 280 | ret = -errno; |
| 281 | goto error; |
| 282 | } |
| 283 | ret = 0; |
| 284 | |
| 285 | error: |
| 286 | return ret; |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | * Internal event listing for a given app. Populate events. |
| 291 | * |
| 292 | * Return number of element in the list or else a negative LTTNG_ERR* code. |
| 293 | * On success, the caller is responsible for freeing the memory |
| 294 | * allocated for "events". |
| 295 | */ |
| 296 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
| 297 | { |
| 298 | int ret, i, len = 0, offset = 0; |
| 299 | uint32_t nb_event; |
| 300 | size_t data_size; |
| 301 | uint32_t reply_ret_code; |
| 302 | struct lttng_event *tmp_events = NULL; |
| 303 | struct lttcomm_agent_list_reply *reply = NULL; |
| 304 | struct lttcomm_agent_list_reply_hdr reply_hdr; |
| 305 | |
| 306 | assert(app); |
| 307 | assert(app->sock); |
| 308 | assert(events); |
| 309 | |
| 310 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
| 311 | app->sock->fd); |
| 312 | |
| 313 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
| 314 | if (ret < 0) { |
| 315 | goto error_io; |
| 316 | } |
| 317 | |
| 318 | /* Get list header so we know how much we'll receive. */ |
| 319 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); |
| 320 | if (ret < 0) { |
| 321 | goto error_io; |
| 322 | } |
| 323 | |
| 324 | reply_ret_code = be32toh(reply_hdr.ret_code); |
| 325 | log_reply_code(reply_ret_code); |
| 326 | switch (reply_ret_code) { |
| 327 | case AGENT_RET_CODE_SUCCESS: |
| 328 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
| 329 | break; |
| 330 | default: |
| 331 | ret = LTTNG_ERR_UNK; |
| 332 | goto error; |
| 333 | } |
| 334 | |
| 335 | reply = zmalloc(data_size); |
| 336 | if (!reply) { |
| 337 | ret = LTTNG_ERR_NOMEM; |
| 338 | goto error; |
| 339 | } |
| 340 | |
| 341 | /* Get the list with the appropriate data size. */ |
| 342 | ret = recv_reply(app->sock, reply, data_size); |
| 343 | if (ret < 0) { |
| 344 | goto error_io; |
| 345 | } |
| 346 | |
| 347 | nb_event = be32toh(reply->nb_event); |
| 348 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); |
| 349 | if (!tmp_events) { |
| 350 | ret = LTTNG_ERR_NOMEM; |
| 351 | goto error; |
| 352 | } |
| 353 | |
| 354 | for (i = 0; i < nb_event; i++) { |
| 355 | offset += len; |
| 356 | strncpy(tmp_events[i].name, reply->payload + offset, |
| 357 | sizeof(tmp_events[i].name)); |
| 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(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 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
| 412 | if (ret < 0) { |
| 413 | goto error_io; |
| 414 | } |
| 415 | |
| 416 | memset(&msg, 0, sizeof(msg)); |
| 417 | msg.loglevel_value = htobe32(event->loglevel_value); |
| 418 | msg.loglevel_type = htobe32(event->loglevel_type); |
| 419 | strncpy(msg.name, event->name, sizeof(msg.name)); |
| 420 | msg.filter_expression_length = htobe32(filter_expression_length); |
| 421 | |
| 422 | bytes_to_send = zmalloc(data_size); |
| 423 | if (!bytes_to_send) { |
| 424 | ret = LTTNG_ERR_NOMEM; |
| 425 | goto error; |
| 426 | } |
| 427 | |
| 428 | memcpy(bytes_to_send, &msg, sizeof(msg)); |
| 429 | if (filter_expression_length > 0) { |
| 430 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, |
| 431 | filter_expression_length); |
| 432 | } |
| 433 | |
| 434 | ret = send_payload(app->sock, bytes_to_send, data_size); |
| 435 | free(bytes_to_send); |
| 436 | if (ret < 0) { |
| 437 | goto error_io; |
| 438 | } |
| 439 | |
| 440 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 441 | if (ret < 0) { |
| 442 | goto error_io; |
| 443 | } |
| 444 | |
| 445 | reply_ret_code = be32toh(reply.ret_code); |
| 446 | log_reply_code(reply_ret_code); |
| 447 | switch (reply_ret_code) { |
| 448 | case AGENT_RET_CODE_SUCCESS: |
| 449 | break; |
| 450 | case AGENT_RET_CODE_UNKNOWN_NAME: |
| 451 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 452 | goto error; |
| 453 | default: |
| 454 | ret = LTTNG_ERR_UNK; |
| 455 | goto error; |
| 456 | } |
| 457 | |
| 458 | return LTTNG_OK; |
| 459 | |
| 460 | error_io: |
| 461 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 462 | error: |
| 463 | return ret; |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. |
| 468 | */ |
| 469 | static |
| 470 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) |
| 471 | { |
| 472 | int ret; |
| 473 | uint32_t len_be; |
| 474 | |
| 475 | len_be = htobe32(len); |
| 476 | ret = send_payload(sock, &len_be, sizeof(len_be)); |
| 477 | if (ret) { |
| 478 | goto end; |
| 479 | } |
| 480 | |
| 481 | ret = send_payload(sock, str, len); |
| 482 | if (ret) { |
| 483 | goto end; |
| 484 | } |
| 485 | end: |
| 486 | return ret; |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | * Internal enable application context on an agent application. This function |
| 491 | * communicates with the agent to enable a given application context. |
| 492 | * |
| 493 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 494 | */ |
| 495 | static int app_context_op(struct agent_app *app, |
| 496 | struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) |
| 497 | { |
| 498 | int ret; |
| 499 | uint32_t reply_ret_code; |
| 500 | struct lttcomm_agent_generic_reply reply; |
| 501 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; |
| 502 | |
| 503 | assert(app); |
| 504 | assert(app->sock); |
| 505 | assert(ctx); |
| 506 | assert(cmd == AGENT_CMD_APP_CTX_ENABLE || |
| 507 | cmd == AGENT_CMD_APP_CTX_DISABLE); |
| 508 | |
| 509 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", |
| 510 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", |
| 511 | ctx->provider_name, ctx->ctx_name, |
| 512 | app->pid, app->sock->fd); |
| 513 | |
| 514 | /* |
| 515 | * Calculate the payload's size, which consists of the size (u32, BE) |
| 516 | * of the provider name, the NULL-terminated provider name string, the |
| 517 | * size (u32, BE) of the context name, followed by the NULL-terminated |
| 518 | * context name string. |
| 519 | */ |
| 520 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; |
| 521 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; |
| 522 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + |
| 523 | sizeof(uint32_t) + app_ctx_name_len; |
| 524 | |
| 525 | ret = send_header(app->sock, data_size, cmd, 0); |
| 526 | if (ret < 0) { |
| 527 | goto error_io; |
| 528 | } |
| 529 | |
| 530 | if (app_ctx_provider_name_len > UINT32_MAX || |
| 531 | app_ctx_name_len > UINT32_MAX) { |
| 532 | ERR("Application context name > MAX_UINT32"); |
| 533 | ret = LTTNG_ERR_INVALID; |
| 534 | goto error; |
| 535 | } |
| 536 | |
| 537 | ret = send_pstring(app->sock, ctx->provider_name, |
| 538 | (uint32_t) app_ctx_provider_name_len); |
| 539 | if (ret < 0) { |
| 540 | goto error_io; |
| 541 | } |
| 542 | |
| 543 | ret = send_pstring(app->sock, ctx->ctx_name, |
| 544 | (uint32_t) app_ctx_name_len); |
| 545 | if (ret < 0) { |
| 546 | goto error_io; |
| 547 | } |
| 548 | |
| 549 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 550 | if (ret < 0) { |
| 551 | goto error_io; |
| 552 | } |
| 553 | |
| 554 | reply_ret_code = be32toh(reply.ret_code); |
| 555 | log_reply_code(reply_ret_code); |
| 556 | switch (reply_ret_code) { |
| 557 | case AGENT_RET_CODE_SUCCESS: |
| 558 | break; |
| 559 | default: |
| 560 | ret = LTTNG_ERR_UNK; |
| 561 | goto error; |
| 562 | } |
| 563 | |
| 564 | return LTTNG_OK; |
| 565 | |
| 566 | error_io: |
| 567 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 568 | error: |
| 569 | return ret; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Internal disable agent event call on a agent application. This function |
| 574 | * communicates with the agent to disable a given event. |
| 575 | * |
| 576 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 577 | */ |
| 578 | static int disable_event(struct agent_app *app, struct agent_event *event) |
| 579 | { |
| 580 | int ret; |
| 581 | uint64_t data_size; |
| 582 | uint32_t reply_ret_code; |
| 583 | struct lttcomm_agent_disable_event msg; |
| 584 | struct lttcomm_agent_generic_reply reply; |
| 585 | |
| 586 | assert(app); |
| 587 | assert(app->sock); |
| 588 | assert(event); |
| 589 | |
| 590 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
| 591 | app->pid, app->sock->fd); |
| 592 | |
| 593 | data_size = sizeof(msg); |
| 594 | |
| 595 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
| 596 | if (ret < 0) { |
| 597 | goto error_io; |
| 598 | } |
| 599 | |
| 600 | memset(&msg, 0, sizeof(msg)); |
| 601 | strncpy(msg.name, event->name, sizeof(msg.name)); |
| 602 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
| 603 | if (ret < 0) { |
| 604 | goto error_io; |
| 605 | } |
| 606 | |
| 607 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 608 | if (ret < 0) { |
| 609 | goto error_io; |
| 610 | } |
| 611 | |
| 612 | reply_ret_code = be32toh(reply.ret_code); |
| 613 | log_reply_code(reply_ret_code); |
| 614 | switch (reply_ret_code) { |
| 615 | case AGENT_RET_CODE_SUCCESS: |
| 616 | break; |
| 617 | case AGENT_RET_CODE_UNKNOWN_NAME: |
| 618 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 619 | goto error; |
| 620 | default: |
| 621 | ret = LTTNG_ERR_UNK; |
| 622 | goto error; |
| 623 | } |
| 624 | |
| 625 | return LTTNG_OK; |
| 626 | |
| 627 | error_io: |
| 628 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 629 | error: |
| 630 | return ret; |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * Send back the registration DONE command to a given agent application. |
| 635 | * |
| 636 | * Return 0 on success or else a negative value. |
| 637 | */ |
| 638 | int agent_send_registration_done(struct agent_app *app) |
| 639 | { |
| 640 | assert(app); |
| 641 | assert(app->sock); |
| 642 | |
| 643 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
| 644 | |
| 645 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Enable agent event on every agent applications registered with the session |
| 650 | * daemon. |
| 651 | * |
| 652 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 653 | */ |
| 654 | int agent_enable_event(struct agent_event *event, |
| 655 | enum lttng_domain_type domain) |
| 656 | { |
| 657 | int ret; |
| 658 | struct agent_app *app; |
| 659 | struct lttng_ht_iter iter; |
| 660 | |
| 661 | assert(event); |
| 662 | |
| 663 | rcu_read_lock(); |
| 664 | |
| 665 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 666 | node.node) { |
| 667 | if (app->domain != domain) { |
| 668 | continue; |
| 669 | } |
| 670 | |
| 671 | /* Enable event on agent application through TCP socket. */ |
| 672 | ret = enable_event(app, event); |
| 673 | if (ret != LTTNG_OK) { |
| 674 | goto error; |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | event->enabled = 1; |
| 679 | ret = LTTNG_OK; |
| 680 | |
| 681 | error: |
| 682 | rcu_read_unlock(); |
| 683 | return ret; |
| 684 | } |
| 685 | |
| 686 | static |
| 687 | void destroy_app_ctx(struct agent_app_ctx *ctx) |
| 688 | { |
| 689 | free(ctx->provider_name); |
| 690 | free(ctx->ctx_name); |
| 691 | free(ctx); |
| 692 | } |
| 693 | |
| 694 | static |
| 695 | struct agent_app_ctx *create_app_ctx(struct lttng_event_context *ctx) |
| 696 | { |
| 697 | struct agent_app_ctx *agent_ctx = NULL; |
| 698 | |
| 699 | if (!ctx) { |
| 700 | goto end; |
| 701 | } |
| 702 | |
| 703 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 704 | agent_ctx = zmalloc(sizeof(*ctx)); |
| 705 | if (!agent_ctx) { |
| 706 | goto end; |
| 707 | } |
| 708 | |
| 709 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); |
| 710 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); |
| 711 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { |
| 712 | destroy_app_ctx(agent_ctx); |
| 713 | agent_ctx = NULL; |
| 714 | } |
| 715 | end: |
| 716 | return agent_ctx; |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * Enable agent context on every agent applications registered with the session |
| 721 | * daemon. |
| 722 | * |
| 723 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 724 | */ |
| 725 | int agent_enable_context(struct lttng_event_context *ctx, |
| 726 | enum lttng_domain_type domain) |
| 727 | { |
| 728 | int ret; |
| 729 | struct agent_app *app; |
| 730 | struct lttng_ht_iter iter; |
| 731 | |
| 732 | assert(ctx); |
| 733 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 734 | ret = LTTNG_ERR_INVALID; |
| 735 | goto error; |
| 736 | } |
| 737 | |
| 738 | rcu_read_lock(); |
| 739 | |
| 740 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 741 | node.node) { |
| 742 | struct agent_app_ctx *agent_ctx; |
| 743 | |
| 744 | if (app->domain != domain) { |
| 745 | continue; |
| 746 | } |
| 747 | |
| 748 | agent_ctx = create_app_ctx(ctx); |
| 749 | if (!agent_ctx) { |
| 750 | ret = LTTNG_ERR_NOMEM; |
| 751 | goto error_unlock; |
| 752 | } |
| 753 | |
| 754 | /* Enable event on agent application through TCP socket. */ |
| 755 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); |
| 756 | destroy_app_ctx(agent_ctx); |
| 757 | if (ret != LTTNG_OK) { |
| 758 | goto error_unlock; |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | ret = LTTNG_OK; |
| 763 | |
| 764 | error_unlock: |
| 765 | rcu_read_unlock(); |
| 766 | error: |
| 767 | return ret; |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * Disable agent event on every agent application registered with the session |
| 772 | * daemon. |
| 773 | * |
| 774 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 775 | */ |
| 776 | int agent_disable_event(struct agent_event *event, |
| 777 | enum lttng_domain_type domain) |
| 778 | { |
| 779 | int ret = LTTNG_OK; |
| 780 | struct agent_app *app; |
| 781 | struct lttng_ht_iter iter; |
| 782 | |
| 783 | assert(event); |
| 784 | if (!event->enabled) { |
| 785 | goto end; |
| 786 | } |
| 787 | |
| 788 | rcu_read_lock(); |
| 789 | |
| 790 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 791 | node.node) { |
| 792 | if (app->domain != domain) { |
| 793 | continue; |
| 794 | } |
| 795 | |
| 796 | /* Enable event on agent application through TCP socket. */ |
| 797 | ret = disable_event(app, event); |
| 798 | if (ret != LTTNG_OK) { |
| 799 | goto error; |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | event->enabled = 0; |
| 804 | |
| 805 | error: |
| 806 | rcu_read_unlock(); |
| 807 | end: |
| 808 | return ret; |
| 809 | } |
| 810 | |
| 811 | /* |
| 812 | * Disable agent context on every agent application registered with the session |
| 813 | * daemon. |
| 814 | * |
| 815 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 816 | */ |
| 817 | int disable_context(struct agent_app_ctx *ctx, enum lttng_domain_type domain) |
| 818 | { |
| 819 | int ret = LTTNG_OK; |
| 820 | struct agent_app *app; |
| 821 | struct lttng_ht_iter iter; |
| 822 | |
| 823 | assert(ctx); |
| 824 | |
| 825 | rcu_read_lock(); |
| 826 | DBG2("Disabling agent application context %s:%s", |
| 827 | ctx->provider_name, ctx->ctx_name); |
| 828 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 829 | node.node) { |
| 830 | if (app->domain != domain) { |
| 831 | continue; |
| 832 | } |
| 833 | |
| 834 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); |
| 835 | if (ret != LTTNG_OK) { |
| 836 | goto end; |
| 837 | } |
| 838 | } |
| 839 | end: |
| 840 | rcu_read_unlock(); |
| 841 | return ret; |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | * Ask every agent for the list of possible event. Events is allocated with the |
| 846 | * events of every agent application. |
| 847 | * |
| 848 | * Return the number of events or else a negative value. |
| 849 | */ |
| 850 | int agent_list_events(struct lttng_event **events, |
| 851 | enum lttng_domain_type domain) |
| 852 | { |
| 853 | int ret; |
| 854 | size_t nbmem, count = 0; |
| 855 | struct agent_app *app; |
| 856 | struct lttng_event *tmp_events = NULL; |
| 857 | struct lttng_ht_iter iter; |
| 858 | |
| 859 | assert(events); |
| 860 | |
| 861 | DBG2("Agent listing events for domain %d", domain); |
| 862 | |
| 863 | nbmem = UST_APP_EVENT_LIST_SIZE; |
| 864 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); |
| 865 | if (!tmp_events) { |
| 866 | PERROR("zmalloc agent list events"); |
| 867 | ret = -ENOMEM; |
| 868 | goto error; |
| 869 | } |
| 870 | |
| 871 | rcu_read_lock(); |
| 872 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
| 873 | node.node) { |
| 874 | ssize_t nb_ev; |
| 875 | struct lttng_event *agent_events; |
| 876 | |
| 877 | /* Skip domain not asked by the list. */ |
| 878 | if (app->domain != domain) { |
| 879 | continue; |
| 880 | } |
| 881 | |
| 882 | nb_ev = list_events(app, &agent_events); |
| 883 | if (nb_ev < 0) { |
| 884 | ret = nb_ev; |
| 885 | goto error_unlock; |
| 886 | } |
| 887 | |
| 888 | if (count + nb_ev > nbmem) { |
| 889 | /* In case the realloc fails, we free the memory */ |
| 890 | struct lttng_event *new_tmp_events; |
| 891 | size_t new_nbmem; |
| 892 | |
| 893 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); |
| 894 | DBG2("Reallocating agent event list from %zu to %zu entries", |
| 895 | nbmem, new_nbmem); |
| 896 | new_tmp_events = realloc(tmp_events, |
| 897 | new_nbmem * sizeof(*new_tmp_events)); |
| 898 | if (!new_tmp_events) { |
| 899 | PERROR("realloc agent events"); |
| 900 | ret = -ENOMEM; |
| 901 | free(agent_events); |
| 902 | goto error_unlock; |
| 903 | } |
| 904 | /* Zero the new memory */ |
| 905 | memset(new_tmp_events + nbmem, 0, |
| 906 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); |
| 907 | nbmem = new_nbmem; |
| 908 | tmp_events = new_tmp_events; |
| 909 | } |
| 910 | memcpy(tmp_events + count, agent_events, |
| 911 | nb_ev * sizeof(*tmp_events)); |
| 912 | free(agent_events); |
| 913 | count += nb_ev; |
| 914 | } |
| 915 | rcu_read_unlock(); |
| 916 | |
| 917 | ret = count; |
| 918 | *events = tmp_events; |
| 919 | return ret; |
| 920 | |
| 921 | error_unlock: |
| 922 | rcu_read_unlock(); |
| 923 | error: |
| 924 | free(tmp_events); |
| 925 | return ret; |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * Create a agent app object using the given PID. |
| 930 | * |
| 931 | * Return newly allocated object or else NULL on error. |
| 932 | */ |
| 933 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
| 934 | struct lttcomm_sock *sock) |
| 935 | { |
| 936 | struct agent_app *app; |
| 937 | |
| 938 | assert(sock); |
| 939 | |
| 940 | app = zmalloc(sizeof(*app)); |
| 941 | if (!app) { |
| 942 | PERROR("zmalloc agent create"); |
| 943 | goto error; |
| 944 | } |
| 945 | |
| 946 | app->pid = pid; |
| 947 | app->domain = domain; |
| 948 | app->sock = sock; |
| 949 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
| 950 | |
| 951 | error: |
| 952 | return app; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * Lookup agent app by socket in the global hash table. |
| 957 | * |
| 958 | * RCU read side lock MUST be acquired. |
| 959 | * |
| 960 | * Return object if found else NULL. |
| 961 | */ |
| 962 | struct agent_app *agent_find_app_by_sock(int sock) |
| 963 | { |
| 964 | struct lttng_ht_node_ulong *node; |
| 965 | struct lttng_ht_iter iter; |
| 966 | struct agent_app *app; |
| 967 | |
| 968 | assert(sock >= 0); |
| 969 | |
| 970 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
| 971 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 972 | if (node == NULL) { |
| 973 | goto error; |
| 974 | } |
| 975 | app = caa_container_of(node, struct agent_app, node); |
| 976 | |
| 977 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
| 978 | return app; |
| 979 | |
| 980 | error: |
| 981 | DBG3("Agent app NOT found by sock %d.", sock); |
| 982 | return NULL; |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * Add agent application object to the global hash table. |
| 987 | */ |
| 988 | void agent_add_app(struct agent_app *app) |
| 989 | { |
| 990 | assert(app); |
| 991 | |
| 992 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
| 993 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
| 994 | } |
| 995 | |
| 996 | /* |
| 997 | * Delete agent application from the global hash table. |
| 998 | * |
| 999 | * rcu_read_lock() must be held by the caller. |
| 1000 | */ |
| 1001 | void agent_delete_app(struct agent_app *app) |
| 1002 | { |
| 1003 | int ret; |
| 1004 | struct lttng_ht_iter iter; |
| 1005 | |
| 1006 | assert(app); |
| 1007 | |
| 1008 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
| 1009 | |
| 1010 | iter.iter.node = &app->node.node; |
| 1011 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
| 1012 | assert(!ret); |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * Destroy an agent application object by detaching it from its corresponding |
| 1017 | * UST app if one is connected by closing the socket. Finally, perform a |
| 1018 | * delayed memory reclaim. |
| 1019 | */ |
| 1020 | void agent_destroy_app(struct agent_app *app) |
| 1021 | { |
| 1022 | assert(app); |
| 1023 | |
| 1024 | if (app->sock) { |
| 1025 | app->sock->ops->close(app->sock); |
| 1026 | lttcomm_destroy_sock(app->sock); |
| 1027 | } |
| 1028 | |
| 1029 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
| 1030 | } |
| 1031 | |
| 1032 | /* |
| 1033 | * Initialize an already allocated agent object. |
| 1034 | * |
| 1035 | * Return 0 on success or else a negative errno value. |
| 1036 | */ |
| 1037 | int agent_init(struct agent *agt) |
| 1038 | { |
| 1039 | int ret; |
| 1040 | |
| 1041 | assert(agt); |
| 1042 | |
| 1043 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 1044 | if (!agt->events) { |
| 1045 | ret = -ENOMEM; |
| 1046 | goto error; |
| 1047 | } |
| 1048 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
| 1049 | |
| 1050 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
| 1051 | return 0; |
| 1052 | |
| 1053 | error: |
| 1054 | return ret; |
| 1055 | } |
| 1056 | |
| 1057 | /* |
| 1058 | * Add agent object to the given hash table. |
| 1059 | */ |
| 1060 | void agent_add(struct agent *agt, struct lttng_ht *ht) |
| 1061 | { |
| 1062 | assert(agt); |
| 1063 | assert(ht); |
| 1064 | |
| 1065 | DBG3("Agent adding from domain %d", agt->domain); |
| 1066 | |
| 1067 | lttng_ht_add_unique_u64(ht, &agt->node); |
| 1068 | } |
| 1069 | |
| 1070 | /* |
| 1071 | * Create an agent object for the given domain. |
| 1072 | * |
| 1073 | * Return the allocated agent or NULL on error. |
| 1074 | */ |
| 1075 | struct agent *agent_create(enum lttng_domain_type domain) |
| 1076 | { |
| 1077 | int ret; |
| 1078 | struct agent *agt; |
| 1079 | |
| 1080 | agt = zmalloc(sizeof(struct agent)); |
| 1081 | if (!agt) { |
| 1082 | goto error; |
| 1083 | } |
| 1084 | agt->domain = domain; |
| 1085 | |
| 1086 | ret = agent_init(agt); |
| 1087 | if (ret < 0) { |
| 1088 | free(agt); |
| 1089 | agt = NULL; |
| 1090 | goto error; |
| 1091 | } |
| 1092 | |
| 1093 | error: |
| 1094 | return agt; |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * Create a newly allocated agent event data structure. |
| 1099 | * Ownership of filter_expression is taken. |
| 1100 | * |
| 1101 | * Return a new object else NULL on error. |
| 1102 | */ |
| 1103 | struct agent_event *agent_create_event(const char *name, |
| 1104 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
| 1105 | struct lttng_filter_bytecode *filter, char *filter_expression) |
| 1106 | { |
| 1107 | struct agent_event *event = NULL; |
| 1108 | |
| 1109 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
| 1110 | loglevel value %d and filter %s", |
| 1111 | name, loglevel_type, loglevel_value, |
| 1112 | filter_expression ? filter_expression : "NULL"); |
| 1113 | |
| 1114 | if (!name) { |
| 1115 | ERR("Failed to create agent event; no name provided."); |
| 1116 | goto error; |
| 1117 | } |
| 1118 | |
| 1119 | event = zmalloc(sizeof(*event)); |
| 1120 | if (!event) { |
| 1121 | goto error; |
| 1122 | } |
| 1123 | |
| 1124 | strncpy(event->name, name, sizeof(event->name)); |
| 1125 | event->name[sizeof(event->name) - 1] = '\0'; |
| 1126 | lttng_ht_node_init_str(&event->node, event->name); |
| 1127 | |
| 1128 | event->loglevel_value = loglevel_value; |
| 1129 | event->loglevel_type = loglevel_type; |
| 1130 | event->filter = filter; |
| 1131 | event->filter_expression = filter_expression; |
| 1132 | error: |
| 1133 | return event; |
| 1134 | } |
| 1135 | |
| 1136 | /* |
| 1137 | * Unique add of a agent event to an agent object. |
| 1138 | */ |
| 1139 | void agent_add_event(struct agent_event *event, struct agent *agt) |
| 1140 | { |
| 1141 | assert(event); |
| 1142 | assert(agt); |
| 1143 | assert(agt->events); |
| 1144 | |
| 1145 | DBG3("Agent adding event %s", event->name); |
| 1146 | add_unique_agent_event(agt->events, event); |
| 1147 | agt->being_used = 1; |
| 1148 | } |
| 1149 | |
| 1150 | /* |
| 1151 | * Unique add of a agent context to an agent object. |
| 1152 | */ |
| 1153 | int agent_add_context(struct lttng_event_context *ctx, struct agent *agt) |
| 1154 | { |
| 1155 | int ret = LTTNG_OK; |
| 1156 | struct agent_app_ctx *agent_ctx = NULL; |
| 1157 | |
| 1158 | assert(ctx); |
| 1159 | assert(agt); |
| 1160 | assert(agt->events); |
| 1161 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 1162 | |
| 1163 | agent_ctx = create_app_ctx(ctx); |
| 1164 | if (!agent_ctx) { |
| 1165 | ret = LTTNG_ERR_NOMEM; |
| 1166 | goto end; |
| 1167 | } |
| 1168 | |
| 1169 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, |
| 1170 | ctx->u.app_ctx.ctx_name); |
| 1171 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); |
| 1172 | end: |
| 1173 | return ret; |
| 1174 | } |
| 1175 | |
| 1176 | /* |
| 1177 | * Find multiple agent events sharing the given name. |
| 1178 | * |
| 1179 | * RCU read side lock MUST be acquired. It must be held for the |
| 1180 | * duration of the iteration. |
| 1181 | * |
| 1182 | * Sets the given iterator. |
| 1183 | */ |
| 1184 | void agent_find_events_by_name(const char *name, struct agent *agt, |
| 1185 | struct lttng_ht_iter* iter) |
| 1186 | { |
| 1187 | struct lttng_ht *ht; |
| 1188 | struct agent_ht_key key; |
| 1189 | |
| 1190 | assert(name); |
| 1191 | assert(agt); |
| 1192 | assert(agt->events); |
| 1193 | assert(iter); |
| 1194 | |
| 1195 | ht = agt->events; |
| 1196 | key.name = name; |
| 1197 | |
| 1198 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 1199 | ht_match_event_by_name, &key, &iter->iter); |
| 1200 | } |
| 1201 | |
| 1202 | /* |
| 1203 | * Get the next agent event duplicate by name. This should be called |
| 1204 | * after a call to agent_find_events_by_name() to iterate on events. |
| 1205 | * |
| 1206 | * The RCU read lock must be held during the iteration and for as long |
| 1207 | * as the object the iterator points to remains in use. |
| 1208 | */ |
| 1209 | void agent_event_next_duplicate(const char *name, |
| 1210 | struct agent *agt, struct lttng_ht_iter* iter) |
| 1211 | { |
| 1212 | struct agent_ht_key key; |
| 1213 | |
| 1214 | key.name = name; |
| 1215 | |
| 1216 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, |
| 1217 | &key, &iter->iter); |
| 1218 | } |
| 1219 | |
| 1220 | /* |
| 1221 | * Find a agent event in the given agent using name, loglevel and filter. |
| 1222 | * |
| 1223 | * RCU read side lock MUST be acquired. It must be kept for as long as |
| 1224 | * the returned agent_event is used. |
| 1225 | * |
| 1226 | * Return object if found else NULL. |
| 1227 | */ |
| 1228 | struct agent_event *agent_find_event(const char *name, |
| 1229 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
| 1230 | char *filter_expression, struct agent *agt) |
| 1231 | { |
| 1232 | struct lttng_ht_node_str *node; |
| 1233 | struct lttng_ht_iter iter; |
| 1234 | struct lttng_ht *ht; |
| 1235 | struct agent_ht_key key; |
| 1236 | |
| 1237 | assert(name); |
| 1238 | assert(agt); |
| 1239 | assert(agt->events); |
| 1240 | |
| 1241 | ht = agt->events; |
| 1242 | key.name = name; |
| 1243 | key.loglevel_value = loglevel_value; |
| 1244 | key.loglevel_type = loglevel_type; |
| 1245 | key.filter_expression = filter_expression; |
| 1246 | |
| 1247 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 1248 | ht_match_event, &key, &iter.iter); |
| 1249 | node = lttng_ht_iter_get_node_str(&iter); |
| 1250 | if (node == NULL) { |
| 1251 | goto error; |
| 1252 | } |
| 1253 | |
| 1254 | DBG3("Agent event found %s.", name); |
| 1255 | return caa_container_of(node, struct agent_event, node); |
| 1256 | |
| 1257 | error: |
| 1258 | DBG3("Agent event NOT found %s.", name); |
| 1259 | return NULL; |
| 1260 | } |
| 1261 | |
| 1262 | /* |
| 1263 | * Free given agent event. This event must not be globally visible at this |
| 1264 | * point (only expected to be used on failure just after event creation). After |
| 1265 | * this call, the pointer is not usable anymore. |
| 1266 | */ |
| 1267 | void agent_destroy_event(struct agent_event *event) |
| 1268 | { |
| 1269 | assert(event); |
| 1270 | |
| 1271 | free(event->filter); |
| 1272 | free(event->filter_expression); |
| 1273 | free(event->exclusion); |
| 1274 | free(event); |
| 1275 | } |
| 1276 | |
| 1277 | static |
| 1278 | void destroy_app_ctx_rcu(struct rcu_head *head) |
| 1279 | { |
| 1280 | struct agent_app_ctx *ctx = |
| 1281 | caa_container_of(head, struct agent_app_ctx, rcu_node); |
| 1282 | |
| 1283 | destroy_app_ctx(ctx); |
| 1284 | } |
| 1285 | |
| 1286 | /* |
| 1287 | * Destroy an agent completely. |
| 1288 | */ |
| 1289 | void agent_destroy(struct agent *agt) |
| 1290 | { |
| 1291 | struct lttng_ht_node_str *node; |
| 1292 | struct lttng_ht_iter iter; |
| 1293 | struct agent_app_ctx *ctx; |
| 1294 | |
| 1295 | assert(agt); |
| 1296 | |
| 1297 | DBG3("Agent destroy"); |
| 1298 | |
| 1299 | rcu_read_lock(); |
| 1300 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
| 1301 | int ret; |
| 1302 | struct agent_event *event; |
| 1303 | |
| 1304 | /* |
| 1305 | * When destroying an event, we have to try to disable it on the |
| 1306 | * agent side so the event stops generating data. The return |
| 1307 | * value is not important since we have to continue anyway |
| 1308 | * destroying the object. |
| 1309 | */ |
| 1310 | event = caa_container_of(node, struct agent_event, node); |
| 1311 | (void) agent_disable_event(event, agt->domain); |
| 1312 | |
| 1313 | ret = lttng_ht_del(agt->events, &iter); |
| 1314 | assert(!ret); |
| 1315 | call_rcu(&node->head, destroy_event_agent_rcu); |
| 1316 | } |
| 1317 | |
| 1318 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
| 1319 | (void) disable_context(ctx, agt->domain); |
| 1320 | cds_list_del(&ctx->list_node); |
| 1321 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); |
| 1322 | } |
| 1323 | rcu_read_unlock(); |
| 1324 | ht_cleanup_push(agt->events); |
| 1325 | free(agt); |
| 1326 | } |
| 1327 | |
| 1328 | /* |
| 1329 | * Allocate agent_apps_ht_by_sock. |
| 1330 | */ |
| 1331 | int agent_app_ht_alloc(void) |
| 1332 | { |
| 1333 | int ret = 0; |
| 1334 | |
| 1335 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1336 | if (!agent_apps_ht_by_sock) { |
| 1337 | ret = -1; |
| 1338 | } |
| 1339 | |
| 1340 | return ret; |
| 1341 | } |
| 1342 | |
| 1343 | /* |
| 1344 | * Destroy a agent application by socket. |
| 1345 | */ |
| 1346 | void agent_destroy_app_by_sock(int sock) |
| 1347 | { |
| 1348 | struct agent_app *app; |
| 1349 | |
| 1350 | assert(sock >= 0); |
| 1351 | |
| 1352 | /* |
| 1353 | * Not finding an application is a very important error that should NEVER |
| 1354 | * happen. The hash table deletion is ONLY done through this call when the |
| 1355 | * main sessiond thread is torn down. |
| 1356 | */ |
| 1357 | rcu_read_lock(); |
| 1358 | app = agent_find_app_by_sock(sock); |
| 1359 | assert(app); |
| 1360 | |
| 1361 | /* RCU read side lock is assumed to be held by this function. */ |
| 1362 | agent_delete_app(app); |
| 1363 | |
| 1364 | /* The application is freed in a RCU call but the socket is closed here. */ |
| 1365 | agent_destroy_app(app); |
| 1366 | rcu_read_unlock(); |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * Clean-up the agent app hash table and destroy it. |
| 1371 | */ |
| 1372 | void agent_app_ht_clean(void) |
| 1373 | { |
| 1374 | struct lttng_ht_node_ulong *node; |
| 1375 | struct lttng_ht_iter iter; |
| 1376 | |
| 1377 | if (!agent_apps_ht_by_sock) { |
| 1378 | return; |
| 1379 | } |
| 1380 | rcu_read_lock(); |
| 1381 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { |
| 1382 | struct agent_app *app; |
| 1383 | |
| 1384 | app = caa_container_of(node, struct agent_app, node); |
| 1385 | agent_destroy_app_by_sock(app->sock->fd); |
| 1386 | } |
| 1387 | rcu_read_unlock(); |
| 1388 | |
| 1389 | lttng_ht_destroy(agent_apps_ht_by_sock); |
| 1390 | } |
| 1391 | |
| 1392 | /* |
| 1393 | * Update a agent application (given socket) using the given agent. |
| 1394 | * |
| 1395 | * Note that this function is most likely to be used with a tracing session |
| 1396 | * thus the caller should make sure to hold the appropriate lock(s). |
| 1397 | */ |
| 1398 | void agent_update(struct agent *agt, int sock) |
| 1399 | { |
| 1400 | int ret; |
| 1401 | struct agent_app *app; |
| 1402 | struct agent_event *event; |
| 1403 | struct lttng_ht_iter iter; |
| 1404 | struct agent_app_ctx *ctx; |
| 1405 | |
| 1406 | assert(agt); |
| 1407 | assert(sock >= 0); |
| 1408 | |
| 1409 | DBG("Agent updating app socket %d", sock); |
| 1410 | |
| 1411 | rcu_read_lock(); |
| 1412 | app = agent_find_app_by_sock(sock); |
| 1413 | /* |
| 1414 | * We are in the registration path thus if the application is gone, |
| 1415 | * there is a serious code flow error. |
| 1416 | */ |
| 1417 | assert(app); |
| 1418 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
| 1419 | /* Skip event if disabled. */ |
| 1420 | if (!event->enabled) { |
| 1421 | continue; |
| 1422 | } |
| 1423 | |
| 1424 | ret = enable_event(app, event); |
| 1425 | if (ret != LTTNG_OK) { |
| 1426 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
| 1427 | event->name, app->pid, app->sock->fd); |
| 1428 | /* Let's try the others here and don't assume the app is dead. */ |
| 1429 | continue; |
| 1430 | } |
| 1431 | } |
| 1432 | |
| 1433 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
| 1434 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); |
| 1435 | if (ret != LTTNG_OK) { |
| 1436 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", |
| 1437 | ctx->provider_name, ctx->ctx_name, |
| 1438 | app->pid, app->sock->fd); |
| 1439 | continue; |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | rcu_read_unlock(); |
| 1444 | } |