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[babeltrace.git] / src / plugins / ctf / lttng-live / viewer-connection.c
1 /*
2 * Copyright 2019 - Francis Deslauriers <francis.deslauriers@efficios.com>
3 * Copyright 2016 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #define BT_COMP_LOG_SELF_COMP (viewer_connection->self_comp)
25 #define BT_LOG_OUTPUT_LEVEL (viewer_connection->log_level)
26 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/VIEWER"
27 #include "logging/comp-logging.h"
28
29 #include <stdio.h>
30 #include <stdint.h>
31 #include <stdlib.h>
32 #include <stdbool.h>
33 #include <unistd.h>
34 #include <glib.h>
35 #include <inttypes.h>
36 #include <sys/types.h>
37 #include <fcntl.h>
38
39 #include "compat/socket.h"
40 #include "compat/endian.h"
41 #include "compat/compiler.h"
42 #include "common/common.h"
43 #include <babeltrace2/babeltrace.h>
44
45 #include "lttng-live.h"
46 #include "viewer-connection.h"
47 #include "lttng-viewer-abi.h"
48 #include "data-stream.h"
49 #include "metadata.h"
50
51 static
52 ssize_t lttng_live_recv(struct live_viewer_connection *viewer_connection,
53 void *buf, size_t len)
54 {
55 ssize_t ret;
56 size_t copied = 0, to_copy = len;
57 struct lttng_live_msg_iter *lttng_live_msg_iter =
58 viewer_connection->lttng_live_msg_iter;
59 BT_SOCKET sock = viewer_connection->control_sock;
60
61 do {
62 ret = bt_socket_recv(sock, buf + copied, to_copy, 0);
63 if (ret > 0) {
64 BT_ASSERT(ret <= to_copy);
65 copied += ret;
66 to_copy -= ret;
67 }
68 if (ret == BT_SOCKET_ERROR && bt_socket_interrupted()) {
69 if (!viewer_connection->in_query &&
70 lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
71 break;
72 } else {
73 continue;
74 }
75 }
76 } while (ret > 0 && to_copy > 0);
77 if (ret > 0)
78 ret = copied;
79 /* ret = 0 means orderly shutdown, ret == BT_SOCKET_ERROR is error. */
80 return ret;
81 }
82
83 static
84 ssize_t lttng_live_send(struct live_viewer_connection *viewer_connection,
85 const void *buf, size_t len)
86 {
87 struct lttng_live_msg_iter *lttng_live_msg_iter =
88 viewer_connection->lttng_live_msg_iter;
89 BT_SOCKET sock = viewer_connection->control_sock;
90 ssize_t ret;
91
92 for (;;) {
93 ret = bt_socket_send_nosigpipe(sock, buf, len);
94 if (ret == BT_SOCKET_ERROR && bt_socket_interrupted()) {
95 if (!viewer_connection->in_query &&
96 lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
97 break;
98 } else {
99 continue;
100 }
101 } else {
102 break;
103 }
104 }
105 return ret;
106 }
107
108 static
109 int parse_url(struct live_viewer_connection *viewer_connection)
110 {
111 char error_buf[256] = { 0 };
112 struct bt_common_lttng_live_url_parts lttng_live_url_parts = { 0 };
113 int ret = -1;
114 const char *path = viewer_connection->url->str;
115
116 if (!path) {
117 goto end;
118 }
119
120 lttng_live_url_parts = bt_common_parse_lttng_live_url(path, error_buf,
121 sizeof(error_buf));
122 if (!lttng_live_url_parts.proto) {
123 BT_COMP_LOGW("Invalid LTTng live URL format: %s", error_buf);
124 goto end;
125 }
126
127 viewer_connection->relay_hostname = lttng_live_url_parts.hostname;
128 lttng_live_url_parts.hostname = NULL;
129
130 if (lttng_live_url_parts.port >= 0) {
131 viewer_connection->port = lttng_live_url_parts.port;
132 } else {
133 viewer_connection->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
134 }
135
136 viewer_connection->target_hostname = lttng_live_url_parts.target_hostname;
137 lttng_live_url_parts.target_hostname = NULL;
138
139 if (lttng_live_url_parts.session_name) {
140 viewer_connection->session_name = lttng_live_url_parts.session_name;
141 lttng_live_url_parts.session_name = NULL;
142 }
143
144 BT_COMP_LOGI("Connecting to hostname : %s, port : %d, "
145 "target hostname : %s, session name : %s, proto : %s",
146 viewer_connection->relay_hostname->str,
147 viewer_connection->port,
148 !viewer_connection->target_hostname ?
149 "<none>" : viewer_connection->target_hostname->str,
150 !viewer_connection->session_name ?
151 "<none>" : viewer_connection->session_name->str,
152 lttng_live_url_parts.proto->str);
153 ret = 0;
154
155 end:
156 bt_common_destroy_lttng_live_url_parts(&lttng_live_url_parts);
157 return ret;
158 }
159
160 static
161 int lttng_live_handshake(struct live_viewer_connection *viewer_connection)
162 {
163 struct lttng_viewer_cmd cmd;
164 struct lttng_viewer_connect connect;
165 const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect);
166 char cmd_buf[cmd_buf_len];
167 int ret;
168 ssize_t ret_len;
169
170 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
171 cmd.data_size = htobe64((uint64_t) sizeof(connect));
172 cmd.cmd_version = htobe32(0);
173
174 connect.viewer_session_id = -1ULL; /* will be set on recv */
175 connect.major = htobe32(LTTNG_LIVE_MAJOR);
176 connect.minor = htobe32(LTTNG_LIVE_MINOR);
177 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
178
179 /*
180 * Merge the cmd and connection request to prevent a write-write
181 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
182 * second write to be performed quickly in presence of Nagle's algorithm
183 */
184 memcpy(cmd_buf, &cmd, sizeof(cmd));
185 memcpy(cmd_buf + sizeof(cmd), &connect, sizeof(connect));
186 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
187 if (ret_len == BT_SOCKET_ERROR) {
188 BT_COMP_LOGE("Error sending version: %s", bt_socket_errormsg());
189 goto error;
190 }
191
192 BT_ASSERT(ret_len == cmd_buf_len);
193
194 ret_len = lttng_live_recv(viewer_connection, &connect, sizeof(connect));
195 if (ret_len == 0) {
196 BT_COMP_LOGI("Remote side has closed connection");
197 goto error;
198 }
199 if (ret_len == BT_SOCKET_ERROR) {
200 BT_COMP_LOGE("Error receiving version: %s", bt_socket_errormsg());
201 goto error;
202 }
203 BT_ASSERT(ret_len == sizeof(connect));
204
205 BT_COMP_LOGI("Received viewer session ID : %" PRIu64,
206 (uint64_t) be64toh(connect.viewer_session_id));
207 BT_COMP_LOGI("Relayd version : %u.%u", be32toh(connect.major),
208 be32toh(connect.minor));
209
210 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
211 BT_COMP_LOGE("Incompatible lttng-relayd protocol");
212 goto error;
213 }
214 /* Use the smallest protocol version implemented. */
215 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
216 viewer_connection->minor = be32toh(connect.minor);
217 } else {
218 viewer_connection->minor = LTTNG_LIVE_MINOR;
219 }
220 viewer_connection->major = LTTNG_LIVE_MAJOR;
221 ret = 0;
222 return ret;
223
224 error:
225 BT_COMP_LOGE("Unable to establish connection");
226 return -1;
227 }
228
229 static
230 int lttng_live_connect_viewer(struct live_viewer_connection *viewer_connection)
231 {
232 struct hostent *host;
233 struct sockaddr_in server_addr;
234 int ret;
235
236 if (parse_url(viewer_connection)) {
237 goto error;
238 }
239
240 host = gethostbyname(viewer_connection->relay_hostname->str);
241 if (!host) {
242 BT_COMP_LOGE("Cannot lookup hostname %s",
243 viewer_connection->relay_hostname->str);
244 goto error;
245 }
246
247 if ((viewer_connection->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == BT_INVALID_SOCKET) {
248 BT_COMP_LOGE("Socket creation failed: %s", bt_socket_errormsg());
249 goto error;
250 }
251
252 server_addr.sin_family = AF_INET;
253 server_addr.sin_port = htons(viewer_connection->port);
254 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
255 memset(&(server_addr.sin_zero), 0, 8);
256
257 if (connect(viewer_connection->control_sock, (struct sockaddr *) &server_addr,
258 sizeof(struct sockaddr)) == BT_SOCKET_ERROR) {
259 BT_COMP_LOGE("Connection failed: %s", bt_socket_errormsg());
260 goto error;
261 }
262 if (lttng_live_handshake(viewer_connection)) {
263 goto error;
264 }
265
266 ret = 0;
267
268 return ret;
269
270 error:
271 if (viewer_connection->control_sock != BT_INVALID_SOCKET) {
272 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
273 BT_COMP_LOGE("Close: %s", bt_socket_errormsg());
274 }
275 }
276 viewer_connection->control_sock = BT_INVALID_SOCKET;
277 return -1;
278 }
279
280 static
281 void lttng_live_disconnect_viewer(
282 struct live_viewer_connection *viewer_connection)
283 {
284 if (viewer_connection->control_sock == BT_INVALID_SOCKET) {
285 return;
286 }
287 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
288 BT_COMP_LOGE("Close: %s", bt_socket_errormsg());
289 viewer_connection->control_sock = BT_INVALID_SOCKET;
290 }
291 }
292
293 static
294 void connection_release(bt_object *obj)
295 {
296 struct live_viewer_connection *conn =
297 container_of(obj, struct live_viewer_connection, obj);
298
299 live_viewer_connection_destroy(conn);
300 }
301
302 static
303 int list_update_session(bt_value *results,
304 const struct lttng_viewer_session *session,
305 bool *_found, struct live_viewer_connection *viewer_connection)
306 {
307 int ret = 0;
308 uint64_t i, len;
309 bt_value *map = NULL;
310 bt_value *hostname = NULL;
311 bt_value *session_name = NULL;
312 bt_value *btval = NULL;
313 bool found = false;
314
315 len = bt_value_array_get_length(results);
316 for (i = 0; i < len; i++) {
317 const char *hostname_str = NULL;
318 const char *session_name_str = NULL;
319
320 map = bt_value_array_borrow_element_by_index(results, i);
321 hostname = bt_value_map_borrow_entry_value(map, "target-hostname");
322 if (!hostname) {
323 BT_COMP_LOGE_STR("Error borrowing \"target-hostname\" entry.");
324 ret = -1;
325 goto end;
326 }
327 session_name = bt_value_map_borrow_entry_value(map, "session-name");
328 if (!session_name) {
329 BT_COMP_LOGE_STR("Error borrowing \"session-name\" entry.");
330 ret = -1;
331 goto end;
332 }
333 hostname_str = bt_value_string_get(hostname);
334 session_name_str = bt_value_string_get(session_name);
335
336 if (strcmp(session->hostname, hostname_str) == 0
337 && strcmp(session->session_name, session_name_str) == 0) {
338 int64_t val;
339 uint32_t streams = be32toh(session->streams);
340 uint32_t clients = be32toh(session->clients);
341
342 found = true;
343
344 btval = bt_value_map_borrow_entry_value(map, "stream-count");
345 if (!btval) {
346 BT_COMP_LOGE_STR("Error borrowing \"stream-count\" entry.");
347 ret = -1;
348 goto end;
349 }
350 val = bt_value_integer_unsigned_get(btval);
351 /* sum */
352 val += streams;
353 bt_value_integer_unsigned_set(btval, val);
354
355 btval = bt_value_map_borrow_entry_value(map, "client-count");
356 if (!btval) {
357 BT_COMP_LOGE_STR("Error borrowing \"client-count\" entry.");
358 ret = -1;
359 goto end;
360 }
361 val = bt_value_integer_unsigned_get(btval);
362 /* max */
363 val = bt_max_t(int64_t, clients, val);
364 bt_value_integer_unsigned_set(btval, val);
365 }
366
367 if (found) {
368 break;
369 }
370 }
371 end:
372 *_found = found;
373 return ret;
374 }
375
376 static
377 int list_append_session(bt_value *results,
378 GString *base_url,
379 const struct lttng_viewer_session *session,
380 struct live_viewer_connection *viewer_connection)
381 {
382 int ret = 0;
383 bt_value_map_insert_entry_status insert_status;
384 bt_value_array_append_element_status append_status;
385 bt_value *map = NULL;
386 GString *url = NULL;
387 bool found = false;
388
389 /*
390 * If the session already exists, add the stream count to it,
391 * and do max of client counts.
392 */
393 ret = list_update_session(results, session, &found, viewer_connection);
394 if (ret || found) {
395 goto end;
396 }
397
398 map = bt_value_map_create();
399 if (!map) {
400 BT_COMP_LOGE_STR("Error creating map value.");
401 ret = -1;
402 goto end;
403 }
404
405 if (base_url->len < 1) {
406 BT_COMP_LOGE_STR("Error: base_url length smaller than 1.");
407 ret = -1;
408 goto end;
409 }
410 /*
411 * key = "url",
412 * value = <string>,
413 */
414 url = g_string_new(base_url->str);
415 g_string_append(url, "/host/");
416 g_string_append(url, session->hostname);
417 g_string_append_c(url, '/');
418 g_string_append(url, session->session_name);
419
420 insert_status = bt_value_map_insert_string_entry(map, "url", url->str);
421 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
422 BT_COMP_LOGE_STR("Error inserting \"url\" entry.");
423 ret = -1;
424 goto end;
425 }
426
427 /*
428 * key = "target-hostname",
429 * value = <string>,
430 */
431 insert_status = bt_value_map_insert_string_entry(map, "target-hostname",
432 session->hostname);
433 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
434 BT_COMP_LOGE_STR("Error inserting \"target-hostname\" entry.");
435 ret = -1;
436 goto end;
437 }
438
439 /*
440 * key = "session-name",
441 * value = <string>,
442 */
443 insert_status = bt_value_map_insert_string_entry(map, "session-name",
444 session->session_name);
445 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
446 BT_COMP_LOGE_STR("Error inserting \"session-name\" entry.");
447 ret = -1;
448 goto end;
449 }
450
451 /*
452 * key = "timer-us",
453 * value = <integer>,
454 */
455 {
456 uint32_t live_timer = be32toh(session->live_timer);
457
458 insert_status = bt_value_map_insert_unsigned_integer_entry(
459 map, "timer-us", live_timer);
460 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
461 BT_COMP_LOGE_STR("Error inserting \"timer-us\" entry.");
462 ret = -1;
463 goto end;
464 }
465 }
466
467 /*
468 * key = "stream-count",
469 * value = <integer>,
470 */
471 {
472 uint32_t streams = be32toh(session->streams);
473
474 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
475 "stream-count", streams);
476 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
477 BT_COMP_LOGE_STR("Error inserting \"stream-count\" entry.");
478 ret = -1;
479 goto end;
480 }
481 }
482
483 /*
484 * key = "client-count",
485 * value = <integer>,
486 */
487 {
488 uint32_t clients = be32toh(session->clients);
489
490 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
491 "client-count", clients);
492 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
493 BT_COMP_LOGE_STR("Error inserting \"client-count\" entry.");
494 ret = -1;
495 goto end;
496 }
497 }
498
499 append_status = bt_value_array_append_element(results, map);
500 if (append_status != BT_VALUE_ARRAY_APPEND_ELEMENT_STATUS_OK) {
501 BT_COMP_LOGE_STR("Error appending map to results.");
502 ret = -1;
503 }
504
505 end:
506 if (url) {
507 g_string_free(url, true);
508 }
509 BT_VALUE_PUT_REF_AND_RESET(map);
510 return ret;
511 }
512
513 /*
514 * Data structure returned:
515 *
516 * {
517 * <array> = {
518 * [n] = {
519 * <map> = {
520 * {
521 * key = "url",
522 * value = <string>,
523 * },
524 * {
525 * key = "target-hostname",
526 * value = <string>,
527 * },
528 * {
529 * key = "session-name",
530 * value = <string>,
531 * },
532 * {
533 * key = "timer-us",
534 * value = <integer>,
535 * },
536 * {
537 * key = "stream-count",
538 * value = <integer>,
539 * },
540 * {
541 * key = "client-count",
542 * value = <integer>,
543 * },
544 * },
545 * }
546 * }
547 */
548
549 BT_HIDDEN
550 bt_component_class_query_method_status live_viewer_connection_list_sessions(
551 struct live_viewer_connection *viewer_connection,
552 const bt_value **user_result)
553 {
554 bt_component_class_query_method_status status =
555 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
556 bt_value *result = NULL;
557 struct lttng_viewer_cmd cmd;
558 struct lttng_viewer_list_sessions list;
559 uint32_t i, sessions_count;
560 ssize_t ret_len;
561
562 result = bt_value_array_create();
563 if (!result) {
564 BT_COMP_LOGE("Error creating array");
565 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
566 goto error;
567 }
568
569 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
570 cmd.data_size = htobe64((uint64_t) 0);
571 cmd.cmd_version = htobe32(0);
572
573 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
574 if (ret_len == BT_SOCKET_ERROR) {
575 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
576 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
577 goto error;
578 }
579 BT_ASSERT(ret_len == sizeof(cmd));
580
581 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
582 if (ret_len == 0) {
583 BT_COMP_LOGI("Remote side has closed connection");
584 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
585 goto error;
586 }
587 if (ret_len == BT_SOCKET_ERROR) {
588 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
589 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
590 goto error;
591 }
592 BT_ASSERT(ret_len == sizeof(list));
593
594 sessions_count = be32toh(list.sessions_count);
595 for (i = 0; i < sessions_count; i++) {
596 struct lttng_viewer_session lsession;
597
598 ret_len = lttng_live_recv(viewer_connection, &lsession,
599 sizeof(lsession));
600 if (ret_len == 0) {
601 BT_COMP_LOGI("Remote side has closed connection");
602 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
603 goto error;
604 }
605 if (ret_len == BT_SOCKET_ERROR) {
606 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
607 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
608 goto error;
609 }
610 BT_ASSERT(ret_len == sizeof(lsession));
611 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
612 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
613 if (list_append_session(result, viewer_connection->url,
614 &lsession, viewer_connection)) {
615 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
616 goto error;
617 }
618 }
619
620 *user_result = result;
621 goto end;
622 error:
623 BT_VALUE_PUT_REF_AND_RESET(result);
624 end:
625 return status;
626 }
627
628 static
629 int lttng_live_query_session_ids(struct lttng_live_msg_iter *lttng_live_msg_iter)
630 {
631 struct lttng_viewer_cmd cmd;
632 struct lttng_viewer_list_sessions list;
633 struct lttng_viewer_session lsession;
634 uint32_t i, sessions_count;
635 ssize_t ret_len;
636 uint64_t session_id;
637 struct live_viewer_connection *viewer_connection =
638 lttng_live_msg_iter->viewer_connection;
639
640 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
641 cmd.data_size = htobe64((uint64_t) 0);
642 cmd.cmd_version = htobe32(0);
643
644 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
645 if (ret_len == BT_SOCKET_ERROR) {
646 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
647 goto error;
648 }
649 BT_ASSERT(ret_len == sizeof(cmd));
650
651 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
652 if (ret_len == 0) {
653 BT_COMP_LOGI("Remote side has closed connection");
654 goto error;
655 }
656 if (ret_len == BT_SOCKET_ERROR) {
657 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
658 goto error;
659 }
660 BT_ASSERT(ret_len == sizeof(list));
661
662 sessions_count = be32toh(list.sessions_count);
663 for (i = 0; i < sessions_count; i++) {
664 ret_len = lttng_live_recv(viewer_connection,
665 &lsession, sizeof(lsession));
666 if (ret_len == 0) {
667 BT_COMP_LOGI("Remote side has closed connection");
668 goto error;
669 }
670 if (ret_len == BT_SOCKET_ERROR) {
671 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
672 goto error;
673 }
674 BT_ASSERT(ret_len == sizeof(lsession));
675 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
676 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
677 session_id = be64toh(lsession.id);
678
679 BT_COMP_LOGI("Adding session %" PRIu64 " hostname: %s session_name: %s",
680 session_id, lsession.hostname, lsession.session_name);
681
682 if ((strncmp(lsession.session_name,
683 viewer_connection->session_name->str,
684 LTTNG_VIEWER_NAME_MAX) == 0) && (strncmp(lsession.hostname,
685 viewer_connection->target_hostname->str,
686 LTTNG_VIEWER_HOST_NAME_MAX) == 0)) {
687 if (lttng_live_add_session(lttng_live_msg_iter, session_id,
688 lsession.hostname,
689 lsession.session_name)) {
690 goto error;
691 }
692 }
693 }
694
695 return 0;
696
697 error:
698 BT_COMP_LOGE("Unable to query session ids");
699 return -1;
700 }
701
702 BT_HIDDEN
703 int lttng_live_create_viewer_session(
704 struct lttng_live_msg_iter *lttng_live_msg_iter)
705 {
706 struct lttng_viewer_cmd cmd;
707 struct lttng_viewer_create_session_response resp;
708 ssize_t ret_len;
709 struct live_viewer_connection *viewer_connection =
710 lttng_live_msg_iter->viewer_connection;
711
712 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
713 cmd.data_size = htobe64((uint64_t) 0);
714 cmd.cmd_version = htobe32(0);
715
716 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
717 if (ret_len == BT_SOCKET_ERROR) {
718 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
719 goto error;
720 }
721 BT_ASSERT(ret_len == sizeof(cmd));
722
723 ret_len = lttng_live_recv(viewer_connection, &resp, sizeof(resp));
724 if (ret_len == 0) {
725 BT_COMP_LOGI("Remote side has closed connection");
726 goto error;
727 }
728 if (ret_len == BT_SOCKET_ERROR) {
729 BT_COMP_LOGE("Error receiving create session reply: %s", bt_socket_errormsg());
730 goto error;
731 }
732 BT_ASSERT(ret_len == sizeof(resp));
733
734 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
735 BT_COMP_LOGE("Error creating viewer session");
736 goto error;
737 }
738 if (lttng_live_query_session_ids(lttng_live_msg_iter)) {
739 goto error;
740 }
741
742 return 0;
743
744 error:
745 return -1;
746 }
747
748 static
749 int receive_streams(struct lttng_live_session *session,
750 uint32_t stream_count)
751 {
752 ssize_t ret_len;
753 uint32_t i;
754 struct lttng_live_msg_iter *lttng_live_msg_iter =
755 session->lttng_live_msg_iter;
756 struct live_viewer_connection *viewer_connection =
757 lttng_live_msg_iter->viewer_connection;
758
759 BT_COMP_LOGI("Getting %" PRIu32 " new streams:", stream_count);
760 for (i = 0; i < stream_count; i++) {
761 struct lttng_viewer_stream stream;
762 struct lttng_live_stream_iterator *live_stream;
763 uint64_t stream_id;
764 uint64_t ctf_trace_id;
765
766 ret_len = lttng_live_recv(viewer_connection, &stream, sizeof(stream));
767 if (ret_len == 0) {
768 BT_COMP_LOGI("Remote side has closed connection");
769 goto error;
770 }
771 if (ret_len == BT_SOCKET_ERROR) {
772 BT_COMP_LOGE("Error receiving stream");
773 goto error;
774 }
775 BT_ASSERT(ret_len == sizeof(stream));
776 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
777 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
778 stream_id = be64toh(stream.id);
779 ctf_trace_id = be64toh(stream.ctf_trace_id);
780
781 if (stream.metadata_flag) {
782 BT_COMP_LOGI(" metadata stream %" PRIu64 " : %s/%s",
783 stream_id, stream.path_name, stream.channel_name);
784 if (lttng_live_metadata_create_stream(session,
785 ctf_trace_id, stream_id,
786 stream.path_name)) {
787 BT_COMP_LOGE("Error creating metadata stream");
788
789 goto error;
790 }
791 session->lazy_stream_msg_init = true;
792 } else {
793 BT_COMP_LOGI(" stream %" PRIu64 " : %s/%s",
794 stream_id, stream.path_name, stream.channel_name);
795 live_stream = lttng_live_stream_iterator_create(session,
796 ctf_trace_id, stream_id);
797 if (!live_stream) {
798 BT_COMP_LOGE("Error creating streamn");
799 goto error;
800 }
801 }
802 }
803 return 0;
804
805 error:
806 return -1;
807 }
808
809 BT_HIDDEN
810 int lttng_live_attach_session(struct lttng_live_session *session)
811 {
812 struct lttng_viewer_cmd cmd;
813 struct lttng_viewer_attach_session_request rq;
814 struct lttng_viewer_attach_session_response rp;
815 struct lttng_live_msg_iter *lttng_live_msg_iter =
816 session->lttng_live_msg_iter;
817 struct live_viewer_connection *viewer_connection =
818 lttng_live_msg_iter->viewer_connection;
819 uint64_t session_id = session->id;
820 uint32_t streams_count;
821 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
822 char cmd_buf[cmd_buf_len];
823 ssize_t ret_len;
824
825 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
826 cmd.data_size = htobe64((uint64_t) sizeof(rq));
827 cmd.cmd_version = htobe32(0);
828
829 memset(&rq, 0, sizeof(rq));
830 rq.session_id = htobe64(session_id);
831 // TODO: add cmd line parameter to select seek beginning
832 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
833 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
834
835 /*
836 * Merge the cmd and connection request to prevent a write-write
837 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
838 * second write to be performed quickly in presence of Nagle's algorithm.
839 */
840 memcpy(cmd_buf, &cmd, sizeof(cmd));
841 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
842 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
843 if (ret_len == BT_SOCKET_ERROR) {
844 BT_COMP_LOGE("Error sending attach request: %s", bt_socket_errormsg());
845 goto error;
846 }
847
848 BT_ASSERT(ret_len == cmd_buf_len);
849 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
850 if (ret_len == 0) {
851 BT_COMP_LOGI("Remote side has closed connection");
852 goto error;
853 }
854 if (ret_len == BT_SOCKET_ERROR) {
855 BT_COMP_LOGE("Error receiving attach response: %s", bt_socket_errormsg());
856 goto error;
857 }
858 BT_ASSERT(ret_len == sizeof(rp));
859
860 streams_count = be32toh(rp.streams_count);
861 switch(be32toh(rp.status)) {
862 case LTTNG_VIEWER_ATTACH_OK:
863 break;
864 case LTTNG_VIEWER_ATTACH_UNK:
865 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
866 goto error;
867 case LTTNG_VIEWER_ATTACH_ALREADY:
868 BT_COMP_LOGW("There is already a viewer attached to this session");
869 goto error;
870 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
871 BT_COMP_LOGW("Not a live session");
872 goto error;
873 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
874 BT_COMP_LOGE("Wrong seek parameter");
875 goto error;
876 default:
877 BT_COMP_LOGE("Unknown attach return code %u", be32toh(rp.status));
878 goto error;
879 }
880
881 /* We receive the initial list of streams. */
882 if (receive_streams(session, streams_count)) {
883 goto error;
884 }
885
886 session->attached = true;
887 session->new_streams_needed = false;
888
889 return 0;
890
891 error:
892 return -1;
893 }
894
895 BT_HIDDEN
896 int lttng_live_detach_session(struct lttng_live_session *session)
897 {
898 struct lttng_viewer_cmd cmd;
899 struct lttng_viewer_detach_session_request rq;
900 struct lttng_viewer_detach_session_response rp;
901 ssize_t ret_len;
902 struct lttng_live_msg_iter *lttng_live_msg_iter =
903 session->lttng_live_msg_iter;
904 struct live_viewer_connection *viewer_connection =
905 lttng_live_msg_iter->viewer_connection;
906 uint64_t session_id = session->id;
907 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
908 char cmd_buf[cmd_buf_len];
909
910 if (!session->attached) {
911 return 0;
912 }
913
914 cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
915 cmd.data_size = htobe64((uint64_t) sizeof(rq));
916 cmd.cmd_version = htobe32(0);
917
918 memset(&rq, 0, sizeof(rq));
919 rq.session_id = htobe64(session_id);
920
921 /*
922 * Merge the cmd and connection request to prevent a write-write
923 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
924 * second write to be performed quickly in presence of Nagle's algorithm.
925 */
926 memcpy(cmd_buf, &cmd, sizeof(cmd));
927 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
928 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
929 if (ret_len == BT_SOCKET_ERROR) {
930 BT_COMP_LOGE("Error sending detach request: %s", bt_socket_errormsg());
931 goto error;
932 }
933
934 BT_ASSERT(ret_len == cmd_buf_len);
935 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
936 if (ret_len == 0) {
937 BT_COMP_LOGI("Remote side has closed connection");
938 goto error;
939 }
940 if (ret_len == BT_SOCKET_ERROR) {
941 BT_COMP_LOGE("Error receiving detach response: %s", bt_socket_errormsg());
942 goto error;
943 }
944 BT_ASSERT(ret_len == sizeof(rp));
945
946 switch(be32toh(rp.status)) {
947 case LTTNG_VIEWER_DETACH_SESSION_OK:
948 break;
949 case LTTNG_VIEWER_DETACH_SESSION_UNK:
950 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
951 goto error;
952 case LTTNG_VIEWER_DETACH_SESSION_ERR:
953 BT_COMP_LOGW("Error detaching session id %" PRIu64 "", session_id);
954 goto error;
955 default:
956 BT_COMP_LOGE("Unknown detach return code %u", be32toh(rp.status));
957 goto error;
958 }
959
960 session->attached = false;
961
962 return 0;
963
964 error:
965 return -1;
966 }
967
968 BT_HIDDEN
969 ssize_t lttng_live_get_one_metadata_packet(struct lttng_live_trace *trace,
970 FILE *fp)
971 {
972 uint64_t len = 0;
973 int ret;
974 struct lttng_viewer_cmd cmd;
975 struct lttng_viewer_get_metadata rq;
976 struct lttng_viewer_metadata_packet rp;
977 char *data = NULL;
978 ssize_t ret_len;
979 struct lttng_live_session *session = trace->session;
980 struct lttng_live_msg_iter *lttng_live_msg_iter =
981 session->lttng_live_msg_iter;
982 struct lttng_live_metadata *metadata = trace->metadata;
983 struct live_viewer_connection *viewer_connection =
984 lttng_live_msg_iter->viewer_connection;
985 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
986 char cmd_buf[cmd_buf_len];
987
988 rq.stream_id = htobe64(metadata->stream_id);
989 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
990 cmd.data_size = htobe64((uint64_t) sizeof(rq));
991 cmd.cmd_version = htobe32(0);
992
993 /*
994 * Merge the cmd and connection request to prevent a write-write
995 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
996 * second write to be performed quickly in presence of Nagle's algorithm.
997 */
998 memcpy(cmd_buf, &cmd, sizeof(cmd));
999 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1000 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1001 if (ret_len == BT_SOCKET_ERROR) {
1002 BT_COMP_LOGE("Error sending get_metadata request: %s", bt_socket_errormsg());
1003 goto error;
1004 }
1005
1006 BT_ASSERT(ret_len == cmd_buf_len);
1007 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1008 if (ret_len == 0) {
1009 BT_COMP_LOGI("Remote side has closed connection");
1010 goto error;
1011 }
1012 if (ret_len == BT_SOCKET_ERROR) {
1013 BT_COMP_LOGE("Error receiving get_metadata response: %s", bt_socket_errormsg());
1014 goto error;
1015 }
1016 BT_ASSERT(ret_len == sizeof(rp));
1017
1018 switch (be32toh(rp.status)) {
1019 case LTTNG_VIEWER_METADATA_OK:
1020 BT_COMP_LOGD("get_metadata : OK");
1021 break;
1022 case LTTNG_VIEWER_NO_NEW_METADATA:
1023 BT_COMP_LOGD("get_metadata : NO NEW");
1024 ret = 0;
1025 goto end;
1026 case LTTNG_VIEWER_METADATA_ERR:
1027 BT_COMP_LOGD("get_metadata : ERR");
1028 goto error;
1029 default:
1030 BT_COMP_LOGD("get_metadata : UNKNOWN");
1031 goto error;
1032 }
1033
1034 len = be64toh(rp.len);
1035 BT_COMP_LOGD("Writing %" PRIu64" bytes to metadata", len);
1036 if (len <= 0) {
1037 goto error;
1038 }
1039
1040 data = calloc(1, len);
1041 if (!data) {
1042 BT_COMP_LOGE("relay data calloc: %s", strerror(errno));
1043 goto error;
1044 }
1045 ret_len = lttng_live_recv(viewer_connection, data, len);
1046 if (ret_len == 0) {
1047 BT_COMP_LOGI("Remote side has closed connection");
1048 goto error_free_data;
1049 }
1050 if (ret_len == BT_SOCKET_ERROR) {
1051 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1052 goto error_free_data;
1053 }
1054 BT_ASSERT(ret_len == len);
1055
1056 do {
1057 ret_len = fwrite(data, 1, len, fp);
1058 } while (ret_len < 0 && errno == EINTR);
1059 if (ret_len < 0) {
1060 BT_COMP_LOGE("Writing in the metadata fp");
1061 goto error_free_data;
1062 }
1063 BT_ASSERT(ret_len == len);
1064 free(data);
1065 ret = len;
1066 end:
1067 return ret;
1068
1069 error_free_data:
1070 free(data);
1071 error:
1072 return -1;
1073 }
1074
1075 /*
1076 * Assign the fields from a lttng_viewer_index to a packet_index.
1077 */
1078 static
1079 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
1080 struct packet_index *pindex)
1081 {
1082 BT_ASSERT(lindex);
1083 BT_ASSERT(pindex);
1084
1085 pindex->offset = be64toh(lindex->offset);
1086 pindex->packet_size = be64toh(lindex->packet_size);
1087 pindex->content_size = be64toh(lindex->content_size);
1088 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
1089 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
1090 pindex->events_discarded = be64toh(lindex->events_discarded);
1091 }
1092
1093 BT_HIDDEN
1094 enum lttng_live_iterator_status lttng_live_get_next_index(
1095 struct lttng_live_msg_iter *lttng_live_msg_iter,
1096 struct lttng_live_stream_iterator *stream,
1097 struct packet_index *index)
1098 {
1099 struct lttng_viewer_cmd cmd;
1100 struct lttng_viewer_get_next_index rq;
1101 struct lttng_viewer_index rp;
1102 enum lttng_live_iterator_status retstatus = LTTNG_LIVE_ITERATOR_STATUS_OK;
1103 struct live_viewer_connection *viewer_connection =
1104 lttng_live_msg_iter->viewer_connection;
1105 struct lttng_live_trace *trace = stream->trace;
1106 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1107 char cmd_buf[cmd_buf_len];
1108 uint32_t flags, status;
1109 ssize_t ret_len;
1110
1111 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1112 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1113 cmd.cmd_version = htobe32(0);
1114
1115
1116 memset(&rq, 0, sizeof(rq));
1117 rq.stream_id = htobe64(stream->viewer_stream_id);
1118
1119 /*
1120 * Merge the cmd and connection request to prevent a write-write
1121 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1122 * second write to be performed quickly in presence of Nagle's algorithm.
1123 */
1124 memcpy(cmd_buf, &cmd, sizeof(cmd));
1125 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1126 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1127 if (ret_len == BT_SOCKET_ERROR) {
1128 BT_COMP_LOGE("Error sending get_next_index request: %s",
1129 bt_socket_errormsg());
1130 goto error;
1131 }
1132
1133 BT_ASSERT(ret_len == cmd_buf_len);
1134 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1135 if (ret_len == 0) {
1136 BT_COMP_LOGI("Remote side has closed connection");
1137 goto error;
1138 }
1139 if (ret_len == BT_SOCKET_ERROR) {
1140 BT_COMP_LOGE("Error receiving get_next_index response: %s",
1141 bt_socket_errormsg());
1142 goto error;
1143 }
1144 BT_ASSERT(ret_len == sizeof(rp));
1145
1146 flags = be32toh(rp.flags);
1147 status = be32toh(rp.status);
1148
1149 switch (status) {
1150 case LTTNG_VIEWER_INDEX_INACTIVE:
1151 {
1152 uint64_t ctf_stream_class_id;
1153
1154 BT_COMP_LOGD("get_next_index: inactive");
1155 memset(index, 0, sizeof(struct packet_index));
1156 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1157 stream->current_inactivity_ts = index->ts_cycles.timestamp_end;
1158 ctf_stream_class_id = be64toh(rp.stream_id);
1159 if (stream->ctf_stream_class_id != -1ULL) {
1160 BT_ASSERT(stream->ctf_stream_class_id ==
1161 ctf_stream_class_id);
1162 } else {
1163 stream->ctf_stream_class_id = ctf_stream_class_id;
1164 }
1165 stream->state = LTTNG_LIVE_STREAM_QUIESCENT;
1166 break;
1167 }
1168 case LTTNG_VIEWER_INDEX_OK:
1169 {
1170 uint64_t ctf_stream_class_id;
1171
1172 BT_COMP_LOGD("get_next_index: OK");
1173 lttng_index_to_packet_index(&rp, index);
1174 ctf_stream_class_id = be64toh(rp.stream_id);
1175 if (stream->ctf_stream_class_id != -1ULL) {
1176 BT_ASSERT(stream->ctf_stream_class_id ==
1177 ctf_stream_class_id);
1178 } else {
1179 stream->ctf_stream_class_id = ctf_stream_class_id;
1180 }
1181
1182 stream->state = LTTNG_LIVE_STREAM_ACTIVE_DATA;
1183
1184 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1185 BT_COMP_LOGD("get_next_index: new metadata needed");
1186 trace->new_metadata_needed = true;
1187 }
1188 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1189 BT_COMP_LOGD("get_next_index: new streams needed");
1190 lttng_live_need_new_streams(lttng_live_msg_iter);
1191 }
1192 break;
1193 }
1194 case LTTNG_VIEWER_INDEX_RETRY:
1195 BT_COMP_LOGD("get_next_index: retry");
1196 memset(index, 0, sizeof(struct packet_index));
1197 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1198 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1199 goto end;
1200 case LTTNG_VIEWER_INDEX_HUP:
1201 BT_COMP_LOGD("get_next_index: stream hung up");
1202 memset(index, 0, sizeof(struct packet_index));
1203 index->offset = EOF;
1204 retstatus = LTTNG_LIVE_ITERATOR_STATUS_END;
1205 stream->state = LTTNG_LIVE_STREAM_EOF;
1206 stream->has_stream_hung_up = true;
1207 break;
1208 case LTTNG_VIEWER_INDEX_ERR:
1209 BT_COMP_LOGE("get_next_index: error");
1210 memset(index, 0, sizeof(struct packet_index));
1211 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1212 goto error;
1213 default:
1214 BT_COMP_LOGE("get_next_index: unknown value");
1215 memset(index, 0, sizeof(struct packet_index));
1216 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1217 goto error;
1218 }
1219 end:
1220 return retstatus;
1221
1222 error:
1223 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1224 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1225 } else {
1226 retstatus = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1227 }
1228 return retstatus;
1229 }
1230
1231 BT_HIDDEN
1232 enum bt_msg_iter_medium_status lttng_live_get_stream_bytes(
1233 struct lttng_live_msg_iter *lttng_live_msg_iter,
1234 struct lttng_live_stream_iterator *stream, uint8_t *buf,
1235 uint64_t offset, uint64_t req_len, uint64_t *recv_len)
1236 {
1237 enum bt_msg_iter_medium_status retstatus = BT_MSG_ITER_MEDIUM_STATUS_OK;
1238 struct lttng_viewer_trace_packet rp;
1239 struct lttng_viewer_cmd cmd;
1240 struct lttng_viewer_get_packet rq;
1241 struct live_viewer_connection *viewer_connection =
1242 lttng_live_msg_iter->viewer_connection;
1243 struct lttng_live_trace *trace = stream->trace;
1244 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1245 char cmd_buf[cmd_buf_len];
1246 uint32_t flags, status;
1247 ssize_t ret_len;
1248
1249 BT_COMP_LOGD("lttng_live_get_stream_bytes: offset=%" PRIu64 ", req_len=%" PRIu64,
1250 offset, req_len);
1251 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
1252 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1253 cmd.cmd_version = htobe32(0);
1254
1255 memset(&rq, 0, sizeof(rq));
1256 rq.stream_id = htobe64(stream->viewer_stream_id);
1257 rq.offset = htobe64(offset);
1258 rq.len = htobe32(req_len);
1259
1260 /*
1261 * Merge the cmd and connection request to prevent a write-write
1262 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1263 * second write to be performed quickly in presence of Nagle's algorithm.
1264 */
1265 memcpy(cmd_buf, &cmd, sizeof(cmd));
1266 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1267 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1268 if (ret_len == BT_SOCKET_ERROR) {
1269 BT_COMP_LOGE("Error sending get_data request: %s", bt_socket_errormsg());
1270 goto error;
1271 }
1272
1273 BT_ASSERT(ret_len == cmd_buf_len);
1274 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1275 if (ret_len == 0) {
1276 BT_COMP_LOGI("Remote side has closed connection");
1277 goto error;
1278 }
1279 if (ret_len == BT_SOCKET_ERROR) {
1280 BT_COMP_LOGE("Error receiving get_data response: %s", bt_socket_errormsg());
1281 goto error;
1282 }
1283 if (ret_len != sizeof(rp)) {
1284 BT_COMP_LOGE("get_data_packet: expected %zu"
1285 ", received %zd", sizeof(rp),
1286 ret_len);
1287 goto error;
1288 }
1289
1290 flags = be32toh(rp.flags);
1291 status = be32toh(rp.status);
1292
1293 switch (status) {
1294 case LTTNG_VIEWER_GET_PACKET_OK:
1295 req_len = be32toh(rp.len);
1296 BT_COMP_LOGD("get_data_packet: Ok, packet size : %" PRIu64 "", req_len);
1297 break;
1298 case LTTNG_VIEWER_GET_PACKET_RETRY:
1299 /* Unimplemented by relay daemon */
1300 BT_COMP_LOGD("get_data_packet: retry");
1301 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1302 goto end;
1303 case LTTNG_VIEWER_GET_PACKET_ERR:
1304 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1305 BT_COMP_LOGD("get_data_packet: new metadata needed, try again later");
1306 trace->new_metadata_needed = true;
1307 }
1308 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1309 BT_COMP_LOGD("get_data_packet: new streams needed, try again later");
1310 lttng_live_need_new_streams(lttng_live_msg_iter);
1311 }
1312 if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
1313 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
1314 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1315 goto end;
1316 }
1317 BT_COMP_LOGE("get_data_packet: error");
1318 goto error;
1319 case LTTNG_VIEWER_GET_PACKET_EOF:
1320 retstatus = BT_MSG_ITER_MEDIUM_STATUS_EOF;
1321 goto end;
1322 default:
1323 BT_COMP_LOGE("get_data_packet: unknown");
1324 goto error;
1325 }
1326
1327 if (req_len == 0) {
1328 goto error;
1329 }
1330
1331 ret_len = lttng_live_recv(viewer_connection, buf, req_len);
1332 if (ret_len == 0) {
1333 BT_COMP_LOGI("Remote side has closed connection");
1334 goto error;
1335 }
1336 if (ret_len == BT_SOCKET_ERROR) {
1337 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1338 goto error;
1339 }
1340 BT_ASSERT(ret_len == req_len);
1341 *recv_len = ret_len;
1342 end:
1343 return retstatus;
1344
1345 error:
1346 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1347 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1348 } else {
1349 retstatus = BT_MSG_ITER_MEDIUM_STATUS_ERROR;
1350 }
1351 return retstatus;
1352 }
1353
1354 /*
1355 * Request new streams for a session.
1356 */
1357 BT_HIDDEN
1358 enum lttng_live_iterator_status lttng_live_get_new_streams(
1359 struct lttng_live_session *session)
1360 {
1361 enum lttng_live_iterator_status status =
1362 LTTNG_LIVE_ITERATOR_STATUS_OK;
1363 struct lttng_viewer_cmd cmd;
1364 struct lttng_viewer_new_streams_request rq;
1365 struct lttng_viewer_new_streams_response rp;
1366 struct lttng_live_msg_iter *lttng_live_msg_iter =
1367 session->lttng_live_msg_iter;
1368 struct live_viewer_connection *viewer_connection =
1369 lttng_live_msg_iter->viewer_connection;
1370 uint32_t streams_count;
1371 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1372 char cmd_buf[cmd_buf_len];
1373 ssize_t ret_len;
1374
1375 if (!session->new_streams_needed) {
1376 return LTTNG_LIVE_ITERATOR_STATUS_OK;
1377 }
1378
1379 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1380 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1381 cmd.cmd_version = htobe32(0);
1382
1383 memset(&rq, 0, sizeof(rq));
1384 rq.session_id = htobe64(session->id);
1385
1386 /*
1387 * Merge the cmd and connection request to prevent a write-write
1388 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1389 * second write to be performed quickly in presence of Nagle's algorithm.
1390 */
1391 memcpy(cmd_buf, &cmd, sizeof(cmd));
1392 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1393 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1394 if (ret_len == BT_SOCKET_ERROR) {
1395 BT_COMP_LOGE("Error sending get_new_streams request: %s",
1396 bt_socket_errormsg());
1397 goto error;
1398 }
1399
1400 BT_ASSERT(ret_len == cmd_buf_len);
1401 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1402 if (ret_len == 0) {
1403 BT_COMP_LOGI("Remote side has closed connection");
1404 goto error;
1405 }
1406 if (ret_len == BT_SOCKET_ERROR) {
1407 BT_COMP_LOGE("Error receiving get_new_streams response");
1408 goto error;
1409 }
1410 BT_ASSERT(ret_len == sizeof(rp));
1411
1412 streams_count = be32toh(rp.streams_count);
1413
1414 switch(be32toh(rp.status)) {
1415 case LTTNG_VIEWER_NEW_STREAMS_OK:
1416 session->new_streams_needed = false;
1417 break;
1418 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1419 session->new_streams_needed = false;
1420 goto end;
1421 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1422 session->new_streams_needed = false;
1423 session->closed = true;
1424 status = LTTNG_LIVE_ITERATOR_STATUS_END;
1425 goto end;
1426 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1427 BT_COMP_LOGE("get_new_streams error");
1428 goto error;
1429 default:
1430 BT_COMP_LOGE("Unknown return code %u", be32toh(rp.status));
1431 goto error;
1432 }
1433
1434 if (receive_streams(session, streams_count)) {
1435 goto error;
1436 }
1437 end:
1438 return status;
1439
1440 error:
1441 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1442 status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1443 } else {
1444 status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1445 }
1446 return status;
1447 }
1448
1449 BT_HIDDEN
1450 struct live_viewer_connection *live_viewer_connection_create(
1451 const char *url, bool in_query,
1452 struct lttng_live_msg_iter *lttng_live_msg_iter,
1453 bt_logging_level log_level)
1454 {
1455 struct live_viewer_connection *viewer_connection;
1456
1457 viewer_connection = g_new0(struct live_viewer_connection, 1);
1458
1459 if (bt_socket_init(log_level) != 0) {
1460 goto error;
1461 }
1462
1463 viewer_connection->log_level = log_level;
1464
1465 if (lttng_live_msg_iter) {
1466 viewer_connection->self_comp = lttng_live_msg_iter->self_comp;
1467 }
1468
1469 bt_object_init_shared(&viewer_connection->obj, connection_release);
1470 viewer_connection->control_sock = BT_INVALID_SOCKET;
1471 viewer_connection->port = -1;
1472 viewer_connection->in_query = in_query;
1473 viewer_connection->lttng_live_msg_iter = lttng_live_msg_iter;
1474 viewer_connection->url = g_string_new(url);
1475 if (!viewer_connection->url) {
1476 goto error;
1477 }
1478
1479 BT_COMP_LOGI("Establishing connection to url \"%s\"...", url);
1480 if (lttng_live_connect_viewer(viewer_connection)) {
1481 goto error_report;
1482 }
1483 BT_COMP_LOGI("Connection to url \"%s\" is established", url);
1484 return viewer_connection;
1485
1486 error_report:
1487 BT_COMP_LOGW("Failure to establish connection to url \"%s\"", url);
1488 error:
1489 if (viewer_connection) {
1490 live_viewer_connection_destroy(viewer_connection);
1491 }
1492
1493 return NULL;
1494 }
1495
1496 BT_HIDDEN
1497 void live_viewer_connection_destroy(
1498 struct live_viewer_connection *viewer_connection)
1499 {
1500 BT_COMP_LOGI("Closing connection to url \"%s\"", viewer_connection->url->str);
1501 lttng_live_disconnect_viewer(viewer_connection);
1502 if (viewer_connection->url) {
1503 g_string_free(viewer_connection->url, true);
1504 }
1505 if (viewer_connection->relay_hostname) {
1506 g_string_free(viewer_connection->relay_hostname, true);
1507 }
1508 if (viewer_connection->target_hostname) {
1509 g_string_free(viewer_connection->target_hostname, true);
1510 }
1511 if (viewer_connection->session_name) {
1512 g_string_free(viewer_connection->session_name, true);
1513 }
1514 g_free(viewer_connection);
1515
1516 bt_socket_fini();
1517 }
BabelTrace - Trace Format Babel Tower
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