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Fix: Missing semicolon after debug statement
[lttng-tools.git] / src / bin / lttng-sessiond / save.c
CommitLineData
fb198a11
JG		 1/*
2 * Copyright (C) 2014 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#define _GNU_SOURCE
19#include <assert.h>
20#include <inttypes.h>
21#include <string.h>
22#include <urcu/uatomic.h>
23#include <unistd.h>
24
25#include <common/defaults.h>
26#include <common/error.h>
27#include <common/config/config.h>
fb198a11
JG		 28#include <common/utils.h>
29#include <common/runas.h>
30#include <lttng/save-internal.h>
31
32#include "save.h"
33#include "session.h"
0de3eda1 34#include "syscall.h"
fb198a11
JG		 35#include "trace-ust.h"
36
37static
38int save_kernel_channel_attributes(struct config_writer *writer,
39 struct lttng_channel_attr *attr)
40{
41 int ret;
42
43 ret = config_writer_write_element_string(writer,
44 config_element_overwrite_mode,
45 attr->overwrite ? config_overwrite_mode_overwrite :
46 config_overwrite_mode_discard);
47 if (ret) {
48 goto end;
49 }
50
51 ret = config_writer_write_element_unsigned_int(writer,
52 config_element_subbuf_size, attr->subbuf_size);
53 if (ret) {
54 goto end;
55 }
56
57 ret = config_writer_write_element_unsigned_int(writer,
58 config_element_num_subbuf,
59 attr->num_subbuf);
60 if (ret) {
61 goto end;
62 }
63
64 ret = config_writer_write_element_unsigned_int(writer,
65 config_element_switch_timer_interval,
66 attr->switch_timer_interval);
67 if (ret) {
68 goto end;
69 }
70
71 ret = config_writer_write_element_unsigned_int(writer,
72 config_element_read_timer_interval,
73 attr->read_timer_interval);
74 if (ret) {
75 goto end;
76 }
77
78 ret = config_writer_write_element_string(writer,
79 config_element_output_type,
80 attr->output == LTTNG_EVENT_SPLICE ?
81 config_output_type_splice : config_output_type_mmap);
82 if (ret) {
83 goto end;
84 }
85
86 ret = config_writer_write_element_unsigned_int(writer,
87 config_element_tracefile_size, attr->tracefile_size);
88 if (ret) {
89 goto end;
90 }
91
92 ret = config_writer_write_element_unsigned_int(writer,
93 config_element_tracefile_count,
94 attr->tracefile_count);
95 if (ret) {
96 goto end;
97 }
98
99 ret = config_writer_write_element_unsigned_int(writer,
100 config_element_live_timer_interval,
101 attr->live_timer_interval);
102 if (ret) {
103 goto end;
104 }
105end:
106 return ret ? LTTNG_ERR_SAVE_IO_FAIL : 0;
107}
108
109static
110int save_ust_channel_attributes(struct config_writer *writer,
111 struct lttng_ust_channel_attr *attr)
112{
113 int ret;
114
115 ret = config_writer_write_element_string(writer,
116 config_element_overwrite_mode,
117 attr->overwrite ? config_overwrite_mode_overwrite :
118 config_overwrite_mode_discard);
119 if (ret) {
120 goto end;
121 }
122
123 ret = config_writer_write_element_unsigned_int(writer,
124 config_element_subbuf_size, attr->subbuf_size);
125 if (ret) {
126 goto end;
127 }
128
129 ret = config_writer_write_element_unsigned_int(writer,
130 config_element_num_subbuf,
131 attr->num_subbuf);
132 if (ret) {
133 goto end;
134 }
135
136 ret = config_writer_write_element_unsigned_int(writer,
137 config_element_switch_timer_interval,
138 attr->switch_timer_interval);
139 if (ret) {
140 goto end;
141 }
142
143 ret = config_writer_write_element_unsigned_int(writer,
144 config_element_read_timer_interval,
145 attr->read_timer_interval);
146 if (ret) {
147 goto end;
148 }
149
150 ret = config_writer_write_element_string(writer,
151 config_element_output_type,
152 attr->output == LTTNG_UST_MMAP ?
153 config_output_type_mmap : config_output_type_splice);
154 if (ret) {
155 goto end;
156 }
157end:
158 return ret ? LTTNG_ERR_SAVE_IO_FAIL : 0;
159}
160
161static
162const char *get_kernel_instrumentation_string(
163 enum lttng_kernel_instrumentation instrumentation)
164{
165 const char *instrumentation_string;
166
167 switch (instrumentation) {
168 case LTTNG_KERNEL_ALL:
169 instrumentation_string = config_event_type_all;
170 break;
171 case LTTNG_KERNEL_TRACEPOINT:
172 instrumentation_string = config_event_type_tracepoint;
173 break;
174 case LTTNG_KERNEL_KPROBE:
175 instrumentation_string = config_event_type_kprobe;
176 break;
177 case LTTNG_KERNEL_FUNCTION:
178 instrumentation_string = config_event_type_function;
179 break;
180 case LTTNG_KERNEL_KRETPROBE:
181 instrumentation_string = config_event_type_kretprobe;
182 break;
183 case LTTNG_KERNEL_NOOP:
184 instrumentation_string = config_event_type_noop;
185 break;
186 case LTTNG_KERNEL_SYSCALL:
187 instrumentation_string = config_event_type_syscall;
188 break;
189 default:
190 instrumentation_string = NULL;
191 }
192
193 return instrumentation_string;
194}
195
196static
197const char *get_kernel_context_type_string(
198 enum lttng_kernel_context_type context_type)
199{
200 const char *context_type_string;
201
202 switch (context_type) {
203 case LTTNG_KERNEL_CONTEXT_PID:
204 context_type_string = config_event_context_pid;
205 break;
206 case LTTNG_KERNEL_CONTEXT_PROCNAME:
207 context_type_string = config_event_context_procname;
208 break;
209 case LTTNG_KERNEL_CONTEXT_PRIO:
210 context_type_string = config_event_context_prio;
211 break;
212 case LTTNG_KERNEL_CONTEXT_NICE:
213 context_type_string = config_event_context_nice;
214 break;
215 case LTTNG_KERNEL_CONTEXT_VPID:
216 context_type_string = config_event_context_vpid;
217 break;
218 case LTTNG_KERNEL_CONTEXT_TID:
219 context_type_string = config_event_context_tid;
220 break;
221 case LTTNG_KERNEL_CONTEXT_VTID:
222 context_type_string = config_event_context_vtid;
223 break;
224 case LTTNG_KERNEL_CONTEXT_PPID:
225 context_type_string = config_event_context_ppid;
226 break;
227 case LTTNG_KERNEL_CONTEXT_VPPID:
228 context_type_string = config_event_context_vppid;
229 break;
230 case LTTNG_KERNEL_CONTEXT_HOSTNAME:
231 context_type_string = config_event_context_hostname;
232 break;
233 default:
234 context_type_string = NULL;
235 }
236
237 return context_type_string;
238}
239
240static
241const char *get_ust_context_type_string(
242 enum lttng_ust_context_type context_type)
243{
244 const char *context_type_string;
245
246 switch (context_type) {
247 case LTTNG_UST_CONTEXT_PROCNAME:
248 context_type_string = config_event_context_procname;
249 break;
250 case LTTNG_UST_CONTEXT_VPID:
251 context_type_string = config_event_context_vpid;
252 break;
253 case LTTNG_UST_CONTEXT_VTID:
254 context_type_string = config_event_context_vtid;
255 break;
256 case LTTNG_UST_CONTEXT_IP:
257 context_type_string = config_event_context_ip;
258 break;
259 case LTTNG_UST_CONTEXT_PTHREAD_ID:
260 context_type_string = config_event_context_pthread_id;
261 break;
e885a367 262 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
14ce5bd8
JG		 263 /*
264 * Error, should not be stored in the XML, perf contexts
265 * are stored as a node of type event_perf_context_type.
266 */
fb198a11
JG		 267 default:
268 context_type_string = NULL;
e885a367 269 break;
fb198a11
JG		 270 }
271
272 return context_type_string;
273}
274
275static
276const char *get_buffer_type_string(
277 enum lttng_buffer_type buffer_type)
278{
279 const char *buffer_type_string;
280
281 switch (buffer_type) {
282 case LTTNG_BUFFER_PER_PID:
283 buffer_type_string = config_buffer_type_per_pid;
284 break;
285 case LTTNG_BUFFER_PER_UID:
286 buffer_type_string = config_buffer_type_per_uid;
287 break;
288 case LTTNG_BUFFER_GLOBAL:
289 buffer_type_string = config_buffer_type_global;
290 break;
291 default:
292 buffer_type_string = NULL;
293 }
294
295 return buffer_type_string;
296}
297
298static
299const char *get_loglevel_type_string(
300 enum lttng_ust_loglevel_type loglevel_type)
301{
302 const char *loglevel_type_string;
303
304 switch (loglevel_type) {
305 case LTTNG_UST_LOGLEVEL_ALL:
306 loglevel_type_string = config_loglevel_type_all;
307 break;
308 case LTTNG_UST_LOGLEVEL_RANGE:
309 loglevel_type_string = config_loglevel_type_range;
310 break;
311 case LTTNG_UST_LOGLEVEL_SINGLE:
312 loglevel_type_string = config_loglevel_type_single;
313 break;
314 default:
315 loglevel_type_string = NULL;
316 }
317
318 return loglevel_type_string;
319}
320
321static
322int save_kernel_event(struct config_writer *writer,
323 struct ltt_kernel_event *event)
324{
325 int ret;
326 const char *instrumentation_type;
327
328 ret = config_writer_open_element(writer, config_element_event);
329 if (ret) {
330 ret = LTTNG_ERR_SAVE_IO_FAIL;
331 goto end;
332 }
333
334 if (event->event->name[0]) {
335 ret = config_writer_write_element_string(writer,
336 config_element_name, event->event->name);
337 if (ret) {
338 ret = LTTNG_ERR_SAVE_IO_FAIL;
339 goto end;
340 }
341 }
342
343 ret = config_writer_write_element_bool(writer, config_element_enabled,
344 event->enabled);
345 if (ret) {
346 ret = LTTNG_ERR_SAVE_IO_FAIL;
347 goto end;
348 }
349
350 instrumentation_type = get_kernel_instrumentation_string(
351 event->event->instrumentation);
352 if (!instrumentation_type) {
353 ret = LTTNG_ERR_INVALID;
354 goto end;
355 }
356
357 ret = config_writer_write_element_string(writer, config_element_type,
358 instrumentation_type);
359 if (ret) {
360 ret = LTTNG_ERR_SAVE_IO_FAIL;
361 goto end;
362 }
363
364 if (event->event->instrumentation == LTTNG_KERNEL_FUNCTION ||
365 event->event->instrumentation == LTTNG_KERNEL_KPROBE ||
366 event->event->instrumentation == LTTNG_KERNEL_KRETPROBE) {
367
368 ret = config_writer_open_element(writer,
369 config_element_attributes);
370 if (ret) {
371 ret = LTTNG_ERR_SAVE_IO_FAIL;
372 goto end;
373 }
374
375 switch (event->event->instrumentation) {
0de3eda1 376 case LTTNG_KERNEL_SYSCALL:
fb198a11
JG		 377 case LTTNG_KERNEL_FUNCTION:
378 ret = config_writer_open_element(writer,
379 config_element_function_attributes);
380 if (ret) {
381 ret = LTTNG_ERR_SAVE_IO_FAIL;
382 goto end;
383 }
384
385 ret = config_writer_write_element_string(writer,
386 config_element_name,
387 event->event->u.ftrace.symbol_name);
388 if (ret) {
389 ret = LTTNG_ERR_SAVE_IO_FAIL;
390 goto end;
391 }
392
393 /* /function attributes */
394 ret = config_writer_close_element(writer);
395 if (ret) {
396 ret = LTTNG_ERR_SAVE_IO_FAIL;
397 goto end;
398 }
399 break;
400 case LTTNG_KERNEL_KPROBE:
401 case LTTNG_KERNEL_KRETPROBE:
402 {
403 const char *symbol_name;
404 uint64_t addr;
405 uint64_t offset;
406
407 if (event->event->instrumentation ==
408 LTTNG_KERNEL_KPROBE) {
409 /*
410 * Comments in lttng-kernel.h mention that
411 * either addr or symbol_name are set, not both.
412 */
413 addr = event->event->u.kprobe.addr;
414 offset = event->event->u.kprobe.offset;
415 symbol_name = addr ? NULL :
416 event->event->u.kprobe.symbol_name;
417 } else {
418 symbol_name =
419 event->event->u.kretprobe.symbol_name;
420 addr = event->event->u.kretprobe.addr;
421 offset = event->event->u.kretprobe.offset;
422 }
423
424 ret = config_writer_open_element(writer,
425 config_element_probe_attributes);
426 if (ret) {
427 ret = LTTNG_ERR_SAVE_IO_FAIL;
428 goto end;
429 }
430
431 if (symbol_name) {
432 ret = config_writer_write_element_string(writer,
433 config_element_symbol_name,
434 symbol_name);
435 if (ret) {
436 ret = LTTNG_ERR_SAVE_IO_FAIL;
437 goto end;
438 }
439 }
440
441 if (addr) {
442 ret = config_writer_write_element_unsigned_int(
443 writer, config_element_address, addr);
444 if (ret) {
445 ret = LTTNG_ERR_SAVE_IO_FAIL;
446 goto end;
447 }
448 }
449
450 if (offset) {
451 ret = config_writer_write_element_unsigned_int(
452 writer, config_element_offset, offset);
453 if (ret) {
454 ret = LTTNG_ERR_SAVE_IO_FAIL;
455 goto end;
456 }
457 }
458
459 ret = config_writer_close_element(writer);
460 if (ret) {
461 ret = LTTNG_ERR_SAVE_IO_FAIL;
462 goto end;
463 }
464 break;
465 }
466 default:
467 ERR("Unsupported kernel instrumentation type.");
468 ret = LTTNG_ERR_INVALID;
469 goto end;
470 }
471
472 /* /attributes */
473 ret = config_writer_close_element(writer);
474 if (ret) {
475 ret = LTTNG_ERR_SAVE_IO_FAIL;
476 goto end;
477 }
478 }
479
480 /* /event */
481 ret = config_writer_close_element(writer);
482 if (ret) {
483 ret = LTTNG_ERR_SAVE_IO_FAIL;
484 goto end;
485 }
486end:
487 return ret;
488}
489
0de3eda1
DG		 490static
491int save_kernel_syscall(struct config_writer *writer,
492 struct ltt_kernel_channel *kchan)
493{
494 int ret, i;
495 ssize_t count;
496 struct lttng_event *events = NULL;
497
498 assert(writer);
499 assert(kchan);
500
501 count = syscall_list_channel(kchan, &events, 0);
502 if (!count) {
503 /* No syscalls, just gracefully return. */
504 ret = 0;
505 goto end;
506 }
507
508 for (i = 0; i < count; i++) {
509 struct ltt_kernel_event *kevent;
510
511 /* Create a temporary kevent in order to save it. */
512 kevent = trace_kernel_create_event(&events[i]);
513 if (!kevent) {
514 ret = -ENOMEM;
515 goto end;
516 }
517 /* Init list in order so the destroy call can del the node. */
518 CDS_INIT_LIST_HEAD(&kevent->list);
519
520 ret = save_kernel_event(writer, kevent);
521 trace_kernel_destroy_event(kevent);
522 if (ret) {
523 goto end;
524 }
525 }
526
527 /* Everything went well */
528 ret = 0;
529
530end:
531 free(events);
532 return ret;
533}
534
fb198a11
JG		 535static
536int save_kernel_events(struct config_writer *writer,
0de3eda1 537 struct ltt_kernel_channel *kchan)
fb198a11
JG		 538{
539 int ret;
540 struct ltt_kernel_event *event;
541
542 ret = config_writer_open_element(writer, config_element_events);
543 if (ret) {
544 ret = LTTNG_ERR_SAVE_IO_FAIL;
545 goto end;
546 }
547
0de3eda1 548 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
fb198a11
JG		 549 ret = save_kernel_event(writer, event);
550 if (ret) {
551 goto end;
552 }
553 }
554
0de3eda1
DG		 555 /* Save syscalls if any. */
556 ret = save_kernel_syscall(writer, kchan);
557 if (ret) {
558 goto end;
559 }
560
fb198a11
JG		 561 /* /events */
562 ret = config_writer_close_element(writer);
563 if (ret) {
564 ret = LTTNG_ERR_SAVE_IO_FAIL;
565 goto end;
566 }
567end:
568 return ret;
569}
570
571static
572int save_ust_event(struct config_writer *writer,
573 struct ltt_ust_event *event)
574{
575 int ret;
576 const char *loglevel_type_string;
577
578 ret = config_writer_open_element(writer, config_element_event);
579 if (ret) {
580 ret = LTTNG_ERR_SAVE_IO_FAIL;
581 goto end;
582 }
583
584 if (event->attr.name[0]) {
585 ret = config_writer_write_element_string(writer,
586 config_element_name, event->attr.name);
587 if (ret) {
588 ret = LTTNG_ERR_SAVE_IO_FAIL;
589 goto end;
590 }
591 }
592
593 ret = config_writer_write_element_bool(writer, config_element_enabled,
594 event->enabled);
595 if (ret) {
596 ret = LTTNG_ERR_SAVE_IO_FAIL;
597 goto end;
598 }
599
600 if (event->attr.instrumentation != LTTNG_UST_TRACEPOINT) {
601 ERR("Unsupported UST instrumentation type.");
602 ret = LTTNG_ERR_INVALID;
603 goto end;
604 }
605 ret = config_writer_write_element_string(writer, config_element_type,
606 config_event_type_tracepoint);
607 if (ret) {
608 ret = LTTNG_ERR_SAVE_IO_FAIL;
609 goto end;
610 }
611
612 loglevel_type_string = get_loglevel_type_string(
613 event->attr.loglevel_type);
614 if (!loglevel_type_string) {
615 ERR("Unsupported UST loglevel type.");
616 ret = LTTNG_ERR_INVALID;
617 goto end;
618 }
619
620 ret = config_writer_write_element_string(writer,
621 config_element_loglevel_type, loglevel_type_string);
622 if (ret) {
623 ret = LTTNG_ERR_SAVE_IO_FAIL;
624 goto end;
625 }
626
e6112cc6
JG		 627 /* The log level is irrelevant if no "filtering" is enabled */
628 if (event->attr.loglevel_type != LTTNG_UST_LOGLEVEL_ALL) {
629 ret = config_writer_write_element_signed_int(writer,
630 config_element_loglevel, event->attr.loglevel);
631 if (ret) {
632 ret = LTTNG_ERR_SAVE_IO_FAIL;
633 goto end;
634 }
fb198a11
JG		 635 }
636
637 if (event->filter_expression) {
638 ret = config_writer_write_element_string(writer,
639 config_element_filter, event->filter_expression);
640 if (ret) {
641 ret = LTTNG_ERR_SAVE_IO_FAIL;
642 goto end;
643 }
644 }
645
646 if (event->exclusion && event->exclusion->count) {
647 uint32_t i;
648
649 ret = config_writer_open_element(writer,
650 config_element_exclusions);
651 if (ret) {
652 ret = LTTNG_ERR_SAVE_IO_FAIL;
653 goto end;
654 }
655
656 for (i = 0; i < event->exclusion->count; i++) {
657 ret = config_writer_write_element_string(writer,
658 config_element_exclusion,
659 &event->exclusion->names[0][i]);
660 if (ret) {
661 ret = LTTNG_ERR_SAVE_IO_FAIL;
662 goto end;
663 }
664 }
665
666 /* /exclusions */
667 ret = config_writer_close_element(writer);
668 if (ret) {
669 ret = LTTNG_ERR_SAVE_IO_FAIL;
670 goto end;
671 }
672 }
673
674 /* /event */
675 ret = config_writer_close_element(writer);
676 if (ret) {
677 ret = LTTNG_ERR_SAVE_IO_FAIL;
678 goto end;
679 }
680end:
681 return ret;
682}
683
684static
685int save_ust_events(struct config_writer *writer,
686 struct lttng_ht *events)
687{
688 int ret;
689 struct ltt_ust_event *event;
690 struct lttng_ht_node_str *node;
691 struct lttng_ht_iter iter;
692
693 ret = config_writer_open_element(writer, config_element_events);
694 if (ret) {
695 ret = LTTNG_ERR_SAVE_IO_FAIL;
696 goto end;
697 }
698
699 rcu_read_lock();
700 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
701 event = caa_container_of(node, struct ltt_ust_event, node);
702
703 ret = save_ust_event(writer, event);
704 if (ret) {
705 rcu_read_unlock();
706 goto end;
707 }
708 }
709 rcu_read_unlock();
710
711 /* /events */
712 ret = config_writer_close_element(writer);
713 if (ret) {
714 ret = LTTNG_ERR_SAVE_IO_FAIL;
715 goto end;
716 }
717end:
718 return ret;
719}
720
721static
722int save_kernel_context(struct config_writer *writer,
723 struct lttng_kernel_context *ctx)
724{
725 int ret = 0;
726
727 if (!ctx) {
728 goto end;
729 }
730
fb198a11
JG		 731 ret = config_writer_open_element(writer, config_element_context);
732 if (ret) {
733 ret = LTTNG_ERR_SAVE_IO_FAIL;
734 goto end;
735 }
736
cba45eda 737 if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) {
fb198a11
JG		 738 ret = config_writer_open_element(writer, config_element_perf);
739 if (ret) {
740 ret = LTTNG_ERR_SAVE_IO_FAIL;
741 goto end;
742 }
743
744 ret = config_writer_write_element_unsigned_int(writer,
745 config_element_type, ctx->u.perf_counter.type);
746 if (ret) {
747 ret = LTTNG_ERR_SAVE_IO_FAIL;
748 goto end;
749 }
750
751 ret = config_writer_write_element_unsigned_int(writer,
752 config_element_config, ctx->u.perf_counter.config);
753 if (ret) {
754 ret = LTTNG_ERR_SAVE_IO_FAIL;
755 goto end;
756 }
757
758 ret = config_writer_write_element_string(writer,
759 config_element_name, ctx->u.perf_counter.name);
760 if (ret) {
761 ret = LTTNG_ERR_SAVE_IO_FAIL;
762 goto end;
763 }
764
765 /* /perf */
766 ret = config_writer_close_element(writer);
767 if (ret) {
768 ret = LTTNG_ERR_SAVE_IO_FAIL;
769 goto end;
770 }
771 } else {
772 const char *context_type_string =
773 get_kernel_context_type_string(ctx->ctx);
774
775 if (!context_type_string) {
776 ERR("Unsupported kernel context type.");
777 ret = LTTNG_ERR_INVALID;
778 goto end;
779 }
780
781 ret = config_writer_write_element_string(writer,
782 config_element_type, context_type_string);
783 if (ret) {
784 ret = LTTNG_ERR_SAVE_IO_FAIL;
785 goto end;
786 }
787 }
788
789 /* /context */
790 ret = config_writer_close_element(writer);
791 if (ret) {
792 ret = LTTNG_ERR_SAVE_IO_FAIL;
793 goto end;
794 }
795
645328ae
DG		 796end:
797 return ret;
798}
799
800static
801int save_kernel_contexts(struct config_writer *writer,
802 struct ltt_kernel_channel *kchan)
803{
804 int ret;
805 struct ltt_kernel_context *ctx;
806
2aa64052
JG		 807 if (cds_list_empty(&kchan->ctx_list)) {
808 ret = 0;
809 goto end;
810 }
811
645328ae
DG		 812 ret = config_writer_open_element(writer, config_element_contexts);
813 if (ret) {
814 ret = LTTNG_ERR_SAVE_IO_FAIL;
815 goto end;
816 }
817
818 cds_list_for_each_entry(ctx, &kchan->ctx_list, list) {
819 ret = save_kernel_context(writer, &ctx->ctx);
820 if (ret) {
821 goto end;
822 }
823 }
824
fb198a11
JG		 825 /* /contexts */
826 ret = config_writer_close_element(writer);
827 if (ret) {
828 ret = LTTNG_ERR_SAVE_IO_FAIL;
829 goto end;
830 }
831end:
832 return ret;
833}
834
835static
836int save_ust_context(struct config_writer *writer,
837 struct cds_list_head *ctx_list)
838{
839 int ret;
840 struct ltt_ust_context *ctx;
841
842 assert(writer);
843 assert(ctx_list);
844
845 ret = config_writer_open_element(writer, config_element_contexts);
846 if (ret) {
847 ret = LTTNG_ERR_SAVE_IO_FAIL;
848 goto end;
849 }
850
851 cds_list_for_each_entry(ctx, ctx_list, list) {
852 const char *context_type_string;
853
fb198a11
JG		 854
855 ret = config_writer_open_element(writer,
856 config_element_context);
857 if (ret) {
858 ret = LTTNG_ERR_SAVE_IO_FAIL;
859 goto end;
860 }
861
14ce5bd8
JG		 862 if (ctx->ctx.ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) {
863 /* Perf contexts are saved as event_perf_context_type */
864 ret = config_writer_open_element(writer,
865 config_element_perf);
866 if (ret) {
867 ret = LTTNG_ERR_SAVE_IO_FAIL;
868 goto end;
869 }
870
871 ret = config_writer_write_element_unsigned_int(writer,
872 config_element_type,
873 ctx->ctx.u.perf_counter.type);
874 if (ret) {
875 ret = LTTNG_ERR_SAVE_IO_FAIL;
876 goto end;
877 }
878
879 ret = config_writer_write_element_unsigned_int(writer,
880 config_element_config,
881 ctx->ctx.u.perf_counter.config);
882 if (ret) {
883 ret = LTTNG_ERR_SAVE_IO_FAIL;
884 goto end;
885 }
886
887 ret = config_writer_write_element_string(writer,
888 config_element_name,
889 ctx->ctx.u.perf_counter.name);
890 if (ret) {
891 ret = LTTNG_ERR_SAVE_IO_FAIL;
892 goto end;
893 }
894
895 /* /perf */
896 ret = config_writer_close_element(writer);
897 if (ret) {
898 ret = LTTNG_ERR_SAVE_IO_FAIL;
899 goto end;
900 }
901 } else {
902 /* Save context as event_context_type_type */
903 context_type_string = get_ust_context_type_string(
904 ctx->ctx.ctx);
905 if (!context_type_string) {
51e03e91 906 ERR("Unsupported UST context type.");
14ce5bd8
JG		 907 ret = LTTNG_ERR_INVALID;
908 goto end;
909 }
910
911 ret = config_writer_write_element_string(writer,
912 config_element_type, context_type_string);
913 if (ret) {
914 ret = LTTNG_ERR_SAVE_IO_FAIL;
915 goto end;
916 }
fb198a11
JG		 917 }
918
919 /* /context */
920 ret = config_writer_close_element(writer);
921 if (ret) {
922 ret = LTTNG_ERR_SAVE_IO_FAIL;
923 goto end;
924 }
925 }
926
927 /* /contexts */
928 ret = config_writer_close_element(writer);
929 if (ret) {
930 ret = LTTNG_ERR_SAVE_IO_FAIL;
931 goto end;
932 }
933end:
934 return ret;
935}
936
937static
938int save_kernel_channel(struct config_writer *writer,
939 struct ltt_kernel_channel *kchan)
940{
941 int ret;
942
943 assert(writer);
944 assert(kchan);
945
946 ret = config_writer_open_element(writer, config_element_channel);
947 if (ret) {
948 ret = LTTNG_ERR_SAVE_IO_FAIL;
949 goto end;
950 }
951
952 ret = config_writer_write_element_string(writer, config_element_name,
953 kchan->channel->name);
954 if (ret) {
955 ret = LTTNG_ERR_SAVE_IO_FAIL;
956 goto end;
957 }
958
959 ret = config_writer_write_element_bool(writer, config_element_enabled,
960 kchan->channel->enabled);
961 if (ret) {
962 ret = LTTNG_ERR_SAVE_IO_FAIL;
963 goto end;
964 }
965
966 ret = save_kernel_channel_attributes(writer, &kchan->channel->attr);
967 if (ret) {
968 goto end;
969 }
970
0de3eda1 971 ret = save_kernel_events(writer, kchan);
fb198a11
JG		 972 if (ret) {
973 goto end;
974 }
975
645328ae 976 ret = save_kernel_contexts(writer, kchan);
fb198a11
JG		 977 if (ret) {
978 goto end;
979 }
980
981 /* /channel */
982 ret = config_writer_close_element(writer);
983 if (ret) {
984 ret = LTTNG_ERR_SAVE_IO_FAIL;
985 goto end;
986 }
987end:
988 return ret;
989}
990
991static
992int save_ust_channel(struct config_writer *writer,
993 struct ltt_ust_channel *ust_chan,
994 struct ltt_ust_session *session)
995{
996 int ret;
997
998 assert(writer);
999 assert(ust_chan);
1000 assert(session);
1001
1002 ret = config_writer_open_element(writer, config_element_channel);
1003 if (ret) {
1004 ret = LTTNG_ERR_SAVE_IO_FAIL;
1005 goto end;
1006 }
1007
1008 ret = config_writer_write_element_string(writer, config_element_name,
1009 ust_chan->name);
1010 if (ret) {
1011 ret = LTTNG_ERR_SAVE_IO_FAIL;
1012 goto end;
1013 }
1014
1015 ret = config_writer_write_element_bool(writer, config_element_enabled,
1016 ust_chan->enabled);
1017 if (ret) {
1018 ret = LTTNG_ERR_SAVE_IO_FAIL;
1019 goto end;
1020 }
1021
1022 ret = save_ust_channel_attributes(writer, &ust_chan->attr);
1023 if (ret) {
1024 goto end;
1025 }
1026
1027 ret = config_writer_write_element_unsigned_int(writer,
1028 config_element_tracefile_size, ust_chan->tracefile_size);
1029 if (ret) {
1030 ret = LTTNG_ERR_SAVE_IO_FAIL;
1031 goto end;
1032 }
1033
1034 ret = config_writer_write_element_unsigned_int(writer,
1035 config_element_tracefile_count, ust_chan->tracefile_count);
1036 if (ret) {
1037 ret = LTTNG_ERR_SAVE_IO_FAIL;
1038 goto end;
1039 }
1040
1041 ret = config_writer_write_element_unsigned_int(writer,
1042 config_element_live_timer_interval,
1043 session->live_timer_interval);
1044 if (ret) {
1045 ret = LTTNG_ERR_SAVE_IO_FAIL;
1046 goto end;
1047 }
1048
1049 ret = save_ust_events(writer, ust_chan->events);
1050 if (ret) {
1051 ret = LTTNG_ERR_SAVE_IO_FAIL;
1052 goto end;
1053 }
1054
1055 ret = save_ust_context(writer, &ust_chan->ctx_list);
1056 if (ret) {
1057 goto end;
1058 }
1059
1060 /* /channel */
1061 ret = config_writer_close_element(writer);
1062 if (ret) {
1063 ret = LTTNG_ERR_SAVE_IO_FAIL;
1064 goto end;
1065 }
1066end:
1067 return ret;
1068}
1069
1070static
1071int save_kernel_session(struct config_writer *writer,
1072 struct ltt_session *session)
1073{
1074 int ret;
1075 struct ltt_kernel_channel *kchan;
1076
1077 assert(writer);
1078 assert(session);
1079
1080 ret = config_writer_write_element_string(writer, config_element_type,
1081 config_domain_type_kernel);
1082 if (ret) {
1083 ret = LTTNG_ERR_SAVE_IO_FAIL;
1084 goto end;
1085 }
1086
1087 ret = config_writer_write_element_string(writer,
1088 config_element_buffer_type, config_buffer_type_global);
1089 if (ret) {
1090 ret = LTTNG_ERR_SAVE_IO_FAIL;
1091 goto end;
1092 }
1093
1094 ret = config_writer_open_element(writer,
1095 config_element_channels);
1096 if (ret) {
1097 ret = LTTNG_ERR_SAVE_IO_FAIL;
1098 goto end;
1099 }
1100
1101 cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head,
1102 list) {
1103 ret = save_kernel_channel(writer, kchan);
1104 if (ret) {
1105 goto end;
1106 }
1107 }
1108
1109 /* /channels */
1110 ret = config_writer_close_element(writer);
1111 if (ret) {
1112 ret = LTTNG_ERR_SAVE_IO_FAIL;
1113 goto end;
1114 }
1115end:
1116 return ret;
1117}
1118
1119static
1120int save_ust_session(struct config_writer *writer,
022d91ba 1121 struct ltt_session *session, int save_agent)
fb198a11
JG		 1122{
1123 int ret;
1124 struct ltt_ust_channel *ust_chan;
1125 const char *buffer_type_string;
1126 struct lttng_ht_node_str *node;
1127 struct lttng_ht_iter iter;
1128
1129 assert(writer);
1130 assert(session);
1131
1132 ret = config_writer_write_element_string(writer, config_element_type,
022d91ba 1133 save_agent ? config_domain_type_jul : config_domain_type_ust);
fb198a11
JG		 1134 if (ret) {
1135 ret = LTTNG_ERR_SAVE_IO_FAIL;
1136 goto end;
1137 }
1138
1139 buffer_type_string = get_buffer_type_string(
1140 session->ust_session->buffer_type);
1141 if (!buffer_type_string) {
1142 ERR("Unsupported buffer type.");
1143 ret = LTTNG_ERR_INVALID;
1144 goto end;
1145 }
1146
1147 ret = config_writer_write_element_string(writer,
1148 config_element_buffer_type, buffer_type_string);
1149 if (ret) {
1150 ret = LTTNG_ERR_SAVE_IO_FAIL;
1151 goto end;
1152 }
1153
1154 ret = config_writer_open_element(writer, config_element_channels);
1155 if (ret) {
1156 ret = LTTNG_ERR_SAVE_IO_FAIL;
1157 goto end;
1158 }
1159
1160 rcu_read_lock();
1161 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1162 &iter.iter, node, node) {
022d91ba 1163 int agent_channel;
fb198a11
JG		 1164
1165 ust_chan = caa_container_of(node, struct ltt_ust_channel, node);
da6c3a50
DG		 1166 agent_channel = !strcmp(DEFAULT_JUL_CHANNEL_NAME, ust_chan->name) ||
1167 !strcmp(DEFAULT_LOG4J_CHANNEL_NAME, ust_chan->name);
022d91ba 1168 if (!(save_agent ^ agent_channel)) {
fb198a11
JG		 1169 ret = save_ust_channel(writer, ust_chan, session->ust_session);
1170 if (ret) {
1171 rcu_read_unlock();
1172 goto end;
1173 }
1174 }
1175 }
1176 rcu_read_unlock();
1177
1178 /* /channels */
1179 ret = config_writer_close_element(writer);
1180 if (ret) {
1181 ret = LTTNG_ERR_SAVE_IO_FAIL;
1182 goto end;
1183 }
1184end:
1185 return ret;
1186}
1187
1188static
1189int save_domains(struct config_writer *writer, struct ltt_session *session)
1190{
1191 int ret = 0;
1192
1193 assert(writer);
1194 assert(session);
1195
1196 if (!session->kernel_session && !session->ust_session) {
1197 goto end;
1198 }
1199
1200 ret = config_writer_open_element(writer, config_element_domains);
1201 if (ret) {
1202 ret = LTTNG_ERR_SAVE_IO_FAIL;
1203 goto end;
1204 }
1205
1206
1207 if (session->kernel_session) {
1208 ret = config_writer_open_element(writer,
1209 config_element_domain);
1210 if (ret) {
1211 ret = LTTNG_ERR_SAVE_IO_FAIL;
1212 goto end;
1213 }
1214
1215 ret = save_kernel_session(writer, session);
1216 if (ret) {
1217 goto end;
1218 }
1219
1220 /* /domain */
1221 ret = config_writer_close_element(writer);
1222 if (ret) {
1223 ret = LTTNG_ERR_SAVE_IO_FAIL;
1224 goto end;
1225 }
1226 }
1227
1228 if (session->ust_session) {
b01421cf
JG		 1229 unsigned long agent_count;
1230
fb198a11
JG		 1231 ret = config_writer_open_element(writer,
1232 config_element_domain);
1233 if (ret) {
1234 ret = LTTNG_ERR_SAVE_IO_FAIL;
1235 goto end;
1236 }
1237
1238 ret = save_ust_session(writer, session, 0);
1239 if (ret) {
1240 goto end;
1241 }
1242
1243 /* /domain */
1244 ret = config_writer_close_element(writer);
1245 if (ret) {
1246 ret = LTTNG_ERR_SAVE_IO_FAIL;
1247 goto end;
1248 }
fb198a11 1249
b01421cf
JG		 1250 rcu_read_lock();
1251 agent_count =
1252 lttng_ht_get_count(session->ust_session->agents);
1253 rcu_read_unlock();
fb198a11 1254
b01421cf
JG		 1255 if (agent_count > 0) {
1256 ret = config_writer_open_element(writer,
1257 config_element_domain);
1258 if (ret) {
1259 ret = LTTNG_ERR_SAVE_IO_FAIL;
1260 goto end;
1261 }
fb198a11 1262
b01421cf
JG		 1263 ret = save_ust_session(writer, session, 1);
1264 if (ret) {
1265 goto end;
1266 }
1267
1268 /* /domain */
1269 ret = config_writer_close_element(writer);
1270 if (ret) {
1271 ret = LTTNG_ERR_SAVE_IO_FAIL;
1272 goto end;
1273 }
fb198a11
JG		 1274 }
1275 }
1276
b01421cf
JG		 1277 if (session->ust_session) {
1278 }
1279
fb198a11
JG		 1280 /* /domains */
1281 ret = config_writer_close_element(writer);
1282 if (ret) {
1283 ret = LTTNG_ERR_SAVE_IO_FAIL;
1284 goto end;
1285 }
1286end:
1287 return ret;
1288}
1289
1290static
1291int save_consumer_output(struct config_writer *writer,
1292 struct consumer_output *output)
1293{
1294 int ret;
1295
1296 assert(writer);
1297 assert(output);
1298
1299 ret = config_writer_open_element(writer, config_element_consumer_output);
1300 if (ret) {
1301 ret = LTTNG_ERR_SAVE_IO_FAIL;
1302 goto end;
1303 }
1304
1305 ret = config_writer_write_element_bool(writer, config_element_enabled,
1306 output->enabled);
1307 if (ret) {
1308 ret = LTTNG_ERR_SAVE_IO_FAIL;
1309 goto end;
1310 }
1311
1312 ret = config_writer_open_element(writer, config_element_destination);
1313 if (ret) {
1314 ret = LTTNG_ERR_SAVE_IO_FAIL;
1315 goto end;
1316 }
1317
1318 switch (output->type) {
1319 case CONSUMER_DST_LOCAL:
1320 ret = config_writer_write_element_string(writer,
1321 config_element_path, output->dst.trace_path);
1322 if (ret) {
1323 ret = LTTNG_ERR_SAVE_IO_FAIL;
1324 goto end;
1325 }
1326 break;
1327 case CONSUMER_DST_NET:
1328 {
1329 char *uri;
1330
1331 uri = zmalloc(PATH_MAX);
1332 if (!uri) {
1333 ret = LTTNG_ERR_NOMEM;
1334 goto end;
1335 }
1336
1337 ret = config_writer_open_element(writer, config_element_net_output);
1338 if (ret) {
1339 ret = LTTNG_ERR_SAVE_IO_FAIL;
1340 goto end_net_output;
1341 }
1342
1343 if (output->dst.net.control_isset &&
1344 output->dst.net.data_isset) {
1345 ret = uri_to_str_url(&output->dst.net.control, uri, PATH_MAX);
1346 if (ret < 0) {
1347 ret = LTTNG_ERR_INVALID;
1348 goto end_net_output;
1349 }
1350
1351 ret = config_writer_write_element_string(writer,
1352 config_element_control_uri, uri);
1353 if (ret) {
1354 ret = LTTNG_ERR_SAVE_IO_FAIL;
1355 goto end_net_output;
1356 }
1357
1358 ret = uri_to_str_url(&output->dst.net.data, uri, PATH_MAX);
1359 if (ret < 0) {
1360 ret = LTTNG_ERR_INVALID;
1361 goto end_net_output;
1362 }
1363
1364 ret = config_writer_write_element_string(writer,
1365 config_element_data_uri, uri);
1366 if (ret) {
1367 ret = LTTNG_ERR_SAVE_IO_FAIL;
1368 goto end_net_output;
1369 }
1370
1371end_net_output:
1372 free(uri);
1373 if (ret) {
1374 goto end;
1375 }
1376 } else {
1377 ret = !output->dst.net.control_isset ?
1378 LTTNG_ERR_URL_CTRL_MISS :
1379 LTTNG_ERR_URL_DATA_MISS;
c39270e5 1380 free(uri);
fb198a11
JG		 1381 goto end;
1382 }
1383
1384 ret = config_writer_close_element(writer);
1385 if (ret) {
1386 ret = LTTNG_ERR_SAVE_IO_FAIL;
1387 goto end;
1388 }
1389 break;
1390 }
1391 default:
1392 ERR("Unsupported consumer output type.");
1393 ret = LTTNG_ERR_INVALID;
1394 goto end;
1395 }
1396
1397 /* /destination */
1398 ret = config_writer_close_element(writer);
1399 if (ret) {
1400 ret = LTTNG_ERR_SAVE_IO_FAIL;
1401 goto end;
1402 }
1403
1404 /* /consumer_output */
1405 ret = config_writer_close_element(writer);
1406 if (ret) {
1407 ret = LTTNG_ERR_SAVE_IO_FAIL;
1408 goto end;
1409 }
1410end:
1411 return ret;
1412}
1413
1414static
1415int save_snapshot_outputs(struct config_writer *writer,
1416 struct snapshot *snapshot)
1417{
1418 int ret;
1419 struct lttng_ht_iter iter;
1420 struct snapshot_output *output;
1421
1422 assert(writer);
1423 assert(snapshot);
1424
1425 ret = config_writer_open_element(writer, config_element_snapshot_outputs);
1426 if (ret) {
1427 ret = LTTNG_ERR_SAVE_IO_FAIL;
1428 goto end;
1429 }
1430
1431 rcu_read_lock();
1432 cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output,
1433 node.node) {
1434 ret = config_writer_open_element(writer,
1435 config_element_output);
1436 if (ret) {
1437 ret = LTTNG_ERR_SAVE_IO_FAIL;
1438 goto end_unlock;
1439 }
1440
1441 ret = config_writer_write_element_string(writer,
1442 config_element_name, output->name);
1443 if (ret) {
1444 ret = LTTNG_ERR_SAVE_IO_FAIL;
1445 goto end_unlock;
1446 }
1447
1448 ret = config_writer_write_element_unsigned_int(writer,
1449 config_element_max_size, output->max_size);
1450 if (ret) {
1451 ret = LTTNG_ERR_SAVE_IO_FAIL;
1452 goto end_unlock;
1453 }
1454
1455 ret = save_consumer_output(writer, output->consumer);
1456 if (ret) {
1457 goto end_unlock;
1458 }
1459
1460 /* /output */
1461 ret = config_writer_close_element(writer);
1462 if (ret) {
1463 ret = LTTNG_ERR_SAVE_IO_FAIL;
1464 goto end_unlock;
1465 }
1466 }
1467 rcu_read_unlock();
1468
1469 /* /snapshot_outputs */
1470 ret = config_writer_close_element(writer);
1471 if (ret) {
1472 ret = LTTNG_ERR_SAVE_IO_FAIL;
1473 goto end;
1474 }
1475
1476end:
1477 return ret;
1478end_unlock:
1479 rcu_read_unlock();
1480 return ret;
1481}
1482
1483static
1484int save_session_output(struct config_writer *writer,
1485 struct ltt_session *session)
1486{
1487 int ret;
1488
1489 assert(writer);
1490 assert(session);
1491
1492 if ((session->snapshot_mode && session->snapshot.nb_output == 0) ||
1493 (!session->snapshot_mode && !session->consumer)) {
1494 /* Session is in no output mode */
1495 ret = 0;
1496 goto end;
1497 }
1498
1499 ret = config_writer_open_element(writer, config_element_output);
1500 if (ret) {
1501 ret = LTTNG_ERR_SAVE_IO_FAIL;
1502 goto end;
1503 }
1504
1505 if (session->snapshot_mode) {
1506 ret = save_snapshot_outputs(writer, &session->snapshot);
1507 if (ret) {
1508 goto end;
1509 }
1510 } else {
1511 if (session->consumer) {
1512 ret = save_consumer_output(writer, session->consumer);
1513 if (ret) {
1514 goto end;
1515 }
1516 }
1517 }
1518
1519 /* /output */
1520 ret = config_writer_close_element(writer);
1521 if (ret) {
1522 ret = LTTNG_ERR_SAVE_IO_FAIL;
1523 goto end;
1524 }
1525end:
1526 return ret;
1527}
1528
1529/*
1530 * Save the given session.
1531 *
1532 * Return 0 on success else a LTTNG_ERR* code.
1533 */
1534static
1535int save_session(struct ltt_session *session,
1536 struct lttng_save_session_attr *attr, lttng_sock_cred *creds)
1537{
1538 int ret, fd;
db471218 1539 unsigned int file_opened = 0; /* Indicate if the file has been opened */
fb198a11
JG		 1540 char config_file_path[PATH_MAX];
1541 size_t len;
1542 struct config_writer *writer = NULL;
1543 size_t session_name_len;
1544 const char *provided_path;
1545
1546 assert(session);
1547 assert(attr);
1548 assert(creds);
1549
1550 session_name_len = strlen(session->name);
95a29ab8 1551 memset(config_file_path, 0, sizeof(config_file_path));
fb198a11
JG		 1552
1553 if (!session_access_ok(session,
1554 LTTNG_SOCK_GET_UID_CRED(creds),
1555 LTTNG_SOCK_GET_GID_CRED(creds))) {
1556 ret = LTTNG_ERR_EPERM;
1557 goto end;
1558 }
1559
1560 provided_path = lttng_save_session_attr_get_output_url(attr);
1561 if (provided_path) {
95a29ab8 1562 DBG3("Save session in provided path %s", provided_path);
fb198a11 1563 len = strlen(provided_path);
d2992717 1564 if (len >= sizeof(config_file_path)) {
fb198a11
JG		 1565 ret = LTTNG_ERR_SET_URL;
1566 goto end;
1567 }
1568 strncpy(config_file_path, provided_path, len);
1569 } else {
7e078ad1 1570 ssize_t ret_len;
fb198a11
JG		 1571 char *home_dir = utils_get_user_home_dir(
1572 LTTNG_SOCK_GET_UID_CRED(creds));
1573 if (!home_dir) {
1574 ret = LTTNG_ERR_SET_URL;
1575 goto end;
1576 }
1577
d2992717 1578 ret_len = snprintf(config_file_path, sizeof(config_file_path),
fb198a11
JG		 1579 DEFAULT_SESSION_HOME_CONFIGPATH, home_dir);
1580 free(home_dir);
7e078ad1 1581 if (ret_len < 0) {
fb198a11
JG		 1582 PERROR("snprintf save session");
1583 ret = LTTNG_ERR_SET_URL;
1584 goto end;
1585 }
7e078ad1 1586 len = ret_len;
fb198a11
JG		 1587 }
1588
1589 /*
d2992717
DG		 1590 * Check the path fits in the config file path dst including the '/'
1591 * followed by trailing .lttng extension and the NULL terminated string.
fb198a11 1592 */
d2992717
DG		 1593 if ((len + session_name_len + 2 +
1594 sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION))
1595 > sizeof(config_file_path)) {
fb198a11
JG		 1596 ret = LTTNG_ERR_SET_URL;
1597 goto end;
1598 }
1599
1600 ret = run_as_mkdir_recursive(config_file_path, S_IRWXU | S_IRWXG,
1601 LTTNG_SOCK_GET_UID_CRED(creds), LTTNG_SOCK_GET_GID_CRED(creds));
1602 if (ret) {
1603 ret = LTTNG_ERR_SET_URL;
1604 goto end;
1605 }
1606
d2992717
DG		 1607 /*
1608 * At this point, we know that everything fits in the buffer. Validation
1609 * was done just above.
1610 */
fb198a11
JG		 1611 config_file_path[len++] = '/';
1612 strncpy(config_file_path + len, session->name, session_name_len);
1613 len += session_name_len;
1614 strcpy(config_file_path + len, DEFAULT_SESSION_CONFIG_FILE_EXTENSION);
95a29ab8
DG		 1615 len += sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION);
1616 config_file_path[len] = '\0';
fb198a11
JG		 1617
1618 if (!access(config_file_path, F_OK) && !attr->overwrite) {
f9b57ab2
DG		 1619 /* File exists, notify the user since the overwrite flag is off. */
1620 ret = LTTNG_ERR_SAVE_FILE_EXIST;
fb198a11
JG		 1621 goto end;
1622 }
1623
1624 fd = run_as_open(config_file_path, O_CREAT | O_WRONLY | O_TRUNC,
1625 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
1626 LTTNG_SOCK_GET_UID_CRED(creds), LTTNG_SOCK_GET_GID_CRED(creds));
1627 if (fd < 0) {
1628 PERROR("Could not create configuration file");
1629 ret = LTTNG_ERR_SAVE_IO_FAIL;
1630 goto end;
1631 }
db471218 1632 file_opened = 1;
fb198a11 1633
705bb62f 1634 writer = config_writer_create(fd, 1);
fb198a11
JG		 1635 if (!writer) {
1636 ret = LTTNG_ERR_NOMEM;
1637 goto end;
1638 }
1639
1640 ret = config_writer_open_element(writer, config_element_sessions);
1641 if (ret) {
1642 ret = LTTNG_ERR_SAVE_IO_FAIL;
1643 goto end;
1644 }
1645
1646 ret = config_writer_open_element(writer, config_element_session);
1647 if (ret) {
1648 ret = LTTNG_ERR_SAVE_IO_FAIL;
1649 goto end;
1650 }
1651
1652 ret = config_writer_write_element_string(writer, config_element_name,
1653 session->name);
1654 if (ret) {
1655 ret = LTTNG_ERR_SAVE_IO_FAIL;
1656 goto end;
1657 }
1658
1659 ret = save_domains(writer, session);
1660 if (ret) {
1661 goto end;
1662 }
1663
1664 ret = config_writer_write_element_bool(writer, config_element_started,
8382cf6f 1665 session->active);
fb198a11
JG		 1666 if (ret) {
1667 ret = LTTNG_ERR_SAVE_IO_FAIL;
1668 goto end;
1669 }
1670
1671 if (session->snapshot_mode || session->live_timer) {
1672 ret = config_writer_open_element(writer, config_element_attributes);
1673 if (ret) {
1674 ret = LTTNG_ERR_SAVE_IO_FAIL;
1675 goto end;
1676 }
1677
1678 if (session->snapshot_mode) {
1679 ret = config_writer_write_element_bool(writer,
1680 config_element_snapshot_mode, 1);
1681 if (ret) {
1682 ret = LTTNG_ERR_SAVE_IO_FAIL;
1683 goto end;
1684 }
1685 } else {
d98ad589 1686 ret = config_writer_write_element_unsigned_int(writer,
fb198a11
JG		 1687 config_element_live_timer_interval, session->live_timer);
1688 if (ret) {
1689 ret = LTTNG_ERR_SAVE_IO_FAIL;
1690 goto end;
1691 }
1692 }
1693
1694 /* /attributes */
1695 ret = config_writer_close_element(writer);
1696 if (ret) {
1697 ret = LTTNG_ERR_SAVE_IO_FAIL;
1698 goto end;
1699 }
1700 }
1701
1702 ret = save_session_output(writer, session);
1703 if (ret) {
1704 goto end;
1705 }
1706
1707 /* /session */
1708 ret = config_writer_close_element(writer);
1709 if (ret) {
1710 ret = LTTNG_ERR_SAVE_IO_FAIL;
1711 goto end;
1712 }
1713
1714 /* /sessions */
1715 ret = config_writer_close_element(writer);
1716 if (ret) {
1717 ret = LTTNG_ERR_SAVE_IO_FAIL;
1718 goto end;
1719 }
1720end:
1721 if (writer && config_writer_destroy(writer)) {
1722 /* Preserve the original error code */
1723 ret = ret ? ret : LTTNG_ERR_SAVE_IO_FAIL;
1724 }
1725 if (ret) {
1726 /* Delete file in case of error */
db471218 1727 if (file_opened && unlink(config_file_path)) {
fb198a11
JG		 1728 PERROR("Unlinking XML session configuration.");
1729 }
1730 }
1731
1732 return ret;
1733}
1734
1735int cmd_save_sessions(struct lttng_save_session_attr *attr,
1736 lttng_sock_cred *creds)
1737{
1738 int ret;
1739 const char *session_name;
1740 struct ltt_session *session;
1741
1742 session_lock_list();
1743
1744 session_name = lttng_save_session_attr_get_session_name(attr);
1745 if (session_name) {
1746 session = session_find_by_name(session_name);
1747 if (!session) {
1748 ret = LTTNG_ERR_SESS_NOT_FOUND;
1749 goto end;
1750 }
1751
1752 session_lock(session);
1753 ret = save_session(session, attr, creds);
1754 session_unlock(session);
1755 if (ret) {
1756 goto end;
1757 }
1758 } else {
1759 struct ltt_session_list *list = session_get_list();
1760
1761 cds_list_for_each_entry(session, &list->head, list) {
1762 session_lock(session);
1763 ret = save_session(session, attr, creds);
1764 session_unlock(session);
1765
1766 /* Don't abort if we don't have the required permissions. */
1767 if (ret && ret != LTTNG_ERR_EPERM) {
1768 goto end;
1769 }
1770 }
1771 }
1772 ret = LTTNG_OK;
1773
1774end:
1775 session_unlock_list();
1776 return ret;
1777}
LTTng 2.0 tools and control repository
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