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lttng: fix argument numbers in add-trigger error messages
[lttng-tools.git] / src / bin / lttng / commands / add_trigger.cpp
1 /*
2 * Copyright (C) 2021 Simon Marchi <simon.marchi@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #include <ctype.h>
9 #include <stdio.h>
10 #include <string.h>
11 #include <stdarg.h>
12
13 #include "../command.h"
14 #include "../loglevel.h"
15 #include "../uprobe.h"
16
17 #include "common/argpar/argpar.h"
18 #include "common/argpar-utils/argpar-utils.h"
19 #include "common/dynamic-array.h"
20 #include "common/mi-lttng.h"
21 #include "common/string-utils/string-utils.h"
22 #include "common/utils.h"
23 #include <lttng/domain-internal.h>
24 /* For lttng_event_rule_type_str(). */
25 #include <lttng/event-rule/event-rule-internal.h>
26 #include <lttng/lttng.h>
27 #include "common/filter/filter-ast.h"
28 #include "common/filter/filter-ir.h"
29 #include "common/dynamic-array.h"
30
31 #if (LTTNG_SYMBOL_NAME_LEN == 256)
32 #define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
33 #endif
34
35 #ifdef LTTNG_EMBED_HELP
36 static const char help_msg[] =
37 #include <lttng-add-trigger.1.h>
38 ;
39 #endif
40
41 enum {
42 OPT_HELP,
43 OPT_LIST_OPTIONS,
44
45 OPT_CONDITION,
46 OPT_ACTION,
47 OPT_ID,
48 OPT_OWNER_UID,
49 OPT_RATE_POLICY,
50
51 OPT_NAME,
52 OPT_FILTER,
53 OPT_EXCLUDE_NAME,
54 OPT_EVENT_NAME,
55 OPT_LOG_LEVEL,
56
57 OPT_TYPE,
58 OPT_LOCATION,
59
60 OPT_MAX_SIZE,
61 OPT_DATA_URL,
62 OPT_CTRL_URL,
63 OPT_URL,
64 OPT_PATH,
65
66 OPT_CAPTURE,
67 };
68
69 static const struct argpar_opt_descr event_rule_opt_descrs[] = {
70 { OPT_FILTER, 'f', "filter", true },
71 { OPT_NAME, 'n', "name", true },
72 { OPT_EXCLUDE_NAME, 'x', "exclude-name", true },
73 { OPT_LOG_LEVEL, 'l', "log-level", true },
74 { OPT_EVENT_NAME, 'E', "event-name", true },
75
76 { OPT_TYPE, 't', "type", true },
77 { OPT_LOCATION, 'L', "location", true },
78
79 /* Capture descriptor */
80 { OPT_CAPTURE, '\0', "capture", true },
81
82 ARGPAR_OPT_DESCR_SENTINEL
83 };
84
85 static
86 bool has_syscall_prefix(const char *arg)
87 {
88 bool matches = false;
89 const char kernel_syscall_type_opt_prefix[] = "kernel:syscall";
90 const size_t kernel_syscall_type_opt_prefix_len =
91 sizeof(kernel_syscall_type_opt_prefix) - 1;
92 const char syscall_type_opt_prefix[] = "syscall";
93 const size_t syscall_type_opt_prefix_len =
94 sizeof(syscall_type_opt_prefix) - 1;
95
96 if (strncmp(arg, syscall_type_opt_prefix,
97 syscall_type_opt_prefix_len) == 0) {
98 matches = true;
99 } else if (strncmp(arg, kernel_syscall_type_opt_prefix,
100 kernel_syscall_type_opt_prefix_len) == 0) {
101 matches = true;
102 } else {
103 matches = false;
104 }
105
106 return matches;
107 }
108
109 static
110 bool assign_event_rule_type(enum lttng_event_rule_type *dest, const char *arg)
111 {
112 bool ret;
113
114 if (*dest != LTTNG_EVENT_RULE_TYPE_UNKNOWN) {
115 ERR("More than one `--type` was specified.");
116 goto error;
117 }
118
119 if (strcmp(arg, "user") == 0 || strcmp(arg, "user:tracepoint") == 0) {
120 *dest = LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT;
121 } else if (strcmp(arg, "kernel") == 0 ||
122 strcmp(arg, "kernel:tracepoint") == 0) {
123 *dest = LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT;
124 } else if (strcmp(arg, "jul") == 0 || strcmp(arg, "jul:logging") == 0) {
125 *dest = LTTNG_EVENT_RULE_TYPE_JUL_LOGGING;
126 } else if (strcmp(arg, "log4j") == 0 ||
127 strcmp(arg, "log4j:logging") == 0) {
128 *dest = LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING;
129 } else if (strcmp(arg, "python") == 0 ||
130 strcmp(arg, "python:logging") == 0) {
131 *dest = LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING;
132 } else if (strcmp(arg, "kprobe") == 0 ||
133 strcmp(arg, "kernel:kprobe") == 0) {
134 *dest = LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE;
135 } else if (strcmp(arg, "kernel:uprobe") == 0) {
136 *dest = LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE;
137 } else if (has_syscall_prefix(arg)) {
138 /*
139 * Matches the following:
140 * - syscall
141 * - syscall:entry
142 * - syscall:exit
143 * - syscall:entry+exit
144 * - syscall:*
145 * - kernel:syscall
146 * - kernel:syscall:entry
147 * - kernel:syscall:exit
148 * - kernel:syscall:entry+exit
149 * - kernel:syscall:*
150 *
151 * Validation for the right side is left to further usage sites.
152 */
153 *dest = LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL;
154 } else {
155 ERR("Invalid `--type` value: %s", arg);
156 goto error;
157 }
158
159 ret = true;
160 goto end;
161
162 error:
163 ret = false;
164
165 end:
166 return ret;
167 }
168
169 static
170 bool assign_string(char **dest, const char *src, const char *opt_name)
171 {
172 bool ret;
173
174 if (*dest) {
175 ERR("Duplicate '%s' given.", opt_name);
176 goto error;
177 }
178
179 *dest = strdup(src);
180 if (!*dest) {
181 PERROR("Failed to allocate string '%s'.", opt_name);
182 goto error;
183 }
184
185 ret = true;
186 goto end;
187
188 error:
189 ret = false;
190
191 end:
192 return ret;
193 }
194
195 static bool parse_syscall_emission_site_from_type(const char *str,
196 enum lttng_event_rule_kernel_syscall_emission_site *type)
197 {
198 bool ret = false;
199 const char kernel_prefix[] = "kernel:";
200 const size_t kernel_prefix_len = sizeof(kernel_prefix) - 1;
201
202 /*
203 * If the passed string is of the form "kernel:syscall*", move the
204 * pointer passed "kernel:".
205 */
206 if (strncmp(str, kernel_prefix, kernel_prefix_len) == 0) {
207 str = &str[kernel_prefix_len];
208 }
209
210 if (strcmp(str, "syscall") == 0 ||
211 strcmp(str, "syscall:entry+exit") == 0) {
212 *type = LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY_EXIT;
213 } else if (strcmp(str, "syscall:entry") == 0) {
214 *type = LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY;
215 } else if (strcmp(str, "syscall:exit") == 0) {
216 *type = LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_EXIT;
217 } else {
218 goto error;
219 }
220
221 ret = true;
222
223 error:
224 return ret;
225 }
226
227 /*
228 * Parse `str` as a log level against the passed event rule type.
229 *
230 * Return the log level in `*log_level`. Return true in `*log_level_only` if
231 * the string specifies exactly this log level, false if it specifies at least
232 * this log level.
233 *
234 * Return true if the string was successfully parsed as a log level string.
235 */
236 static bool parse_log_level_string(const char *str,
237 enum lttng_event_rule_type event_rule_type,
238 int *log_level,
239 bool *log_level_only)
240 {
241 bool ret;
242
243 switch (event_rule_type) {
244 case LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT:
245 {
246 enum lttng_loglevel log_level_min, log_level_max;
247 if (!loglevel_parse_range_string(
248 str, &log_level_min, &log_level_max)) {
249 goto error;
250 }
251
252 /* Only support VAL and VAL.. for now. */
253 if (log_level_min != log_level_max &&
254 log_level_max != LTTNG_LOGLEVEL_EMERG) {
255 goto error;
256 }
257
258 *log_level = (int) log_level_min;
259 *log_level_only = log_level_min == log_level_max;
260 break;
261 }
262 case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
263 {
264 enum lttng_loglevel_log4j log_level_min, log_level_max;
265 if (!loglevel_log4j_parse_range_string(
266 str, &log_level_min, &log_level_max)) {
267 goto error;
268 }
269
270 /* Only support VAL and VAL.. for now. */
271 if (log_level_min != log_level_max &&
272 log_level_max != LTTNG_LOGLEVEL_LOG4J_FATAL) {
273 goto error;
274 }
275
276 *log_level = (int) log_level_min;
277 *log_level_only = log_level_min == log_level_max;
278 break;
279 }
280 case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
281 {
282 enum lttng_loglevel_jul log_level_min, log_level_max;
283 if (!loglevel_jul_parse_range_string(
284 str, &log_level_min, &log_level_max)) {
285 goto error;
286 }
287
288 /* Only support VAL and VAL.. for now. */
289 if (log_level_min != log_level_max &&
290 log_level_max != LTTNG_LOGLEVEL_JUL_SEVERE) {
291 goto error;
292 }
293
294 *log_level = (int) log_level_min;
295 *log_level_only = log_level_min == log_level_max;
296 break;
297 }
298 case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
299 {
300 enum lttng_loglevel_python log_level_min, log_level_max;
301 if (!loglevel_python_parse_range_string(
302 str, &log_level_min, &log_level_max)) {
303 goto error;
304 }
305
306 /* Only support VAL and VAL.. for now. */
307 if (log_level_min != log_level_max &&
308 log_level_max !=
309 LTTNG_LOGLEVEL_PYTHON_CRITICAL) {
310 goto error;
311 }
312
313 *log_level = (int) log_level_min;
314 *log_level_only = log_level_min == log_level_max;
315 break;
316 }
317 default:
318 /* Invalid domain type. */
319 abort();
320 }
321
322 ret = true;
323 goto end;
324
325 error:
326 ret = false;
327
328 end:
329 return ret;
330 }
331
332 static int parse_kernel_probe_opts(const char *source,
333 struct lttng_kernel_probe_location **location)
334 {
335 int ret = 0;
336 int match;
337 char s_hex[19];
338 char name[LTTNG_SYMBOL_NAME_LEN];
339 char *symbol_name = NULL;
340 uint64_t offset;
341
342 /* Check for symbol+offset. */
343 match = sscanf(source,
344 "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
345 "[^'+']+%18s",
346 name, s_hex);
347 if (match == 2) {
348 if (*s_hex == '\0') {
349 ERR("Kernel probe symbol offset is missing.");
350 goto error;
351 }
352
353 symbol_name = strndup(name, LTTNG_SYMBOL_NAME_LEN);
354 if (!symbol_name) {
355 PERROR("Failed to copy kernel probe location symbol name.");
356 goto error;
357 }
358 offset = strtoul(s_hex, NULL, 0);
359
360 *location = lttng_kernel_probe_location_symbol_create(
361 symbol_name, offset);
362 if (!*location) {
363 ERR("Failed to create symbol kernel probe location.");
364 goto error;
365 }
366
367 goto end;
368 }
369
370 /* Check for symbol. */
371 if (isalpha(name[0]) || name[0] == '_') {
372 match = sscanf(source,
373 "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
374 "s",
375 name);
376 if (match == 1) {
377 symbol_name = strndup(name, LTTNG_SYMBOL_NAME_LEN);
378 if (!symbol_name) {
379 ERR("Failed to copy kernel probe location symbol name.");
380 goto error;
381 }
382
383 *location = lttng_kernel_probe_location_symbol_create(
384 symbol_name, 0);
385 if (!*location) {
386 ERR("Failed to create symbol kernel probe location.");
387 goto error;
388 }
389
390 goto end;
391 }
392 }
393
394 /* Check for address. */
395 match = sscanf(source, "%18s", s_hex);
396 if (match > 0) {
397 uint64_t address;
398
399 if (*s_hex == '\0') {
400 ERR("Invalid kernel probe location address.");
401 goto error;
402 }
403
404 address = strtoul(s_hex, NULL, 0);
405 *location = lttng_kernel_probe_location_address_create(address);
406 if (!*location) {
407 ERR("Failed to create symbol kernel probe location.");
408 goto error;
409 }
410
411 goto end;
412 }
413
414 error:
415 /* No match */
416 ret = -1;
417 *location = NULL;
418
419 end:
420 free(symbol_name);
421 return ret;
422 }
423
424 static
425 struct lttng_event_expr *ir_op_load_expr_to_event_expr(
426 const struct ir_load_expression *load_expr,
427 const char *capture_str)
428 {
429 char *provider_name = NULL;
430 struct lttng_event_expr *event_expr = NULL;
431 const struct ir_load_expression_op *load_expr_op = load_expr->child;
432 const enum ir_load_expression_type load_expr_child_type =
433 load_expr_op->type;
434
435 switch (load_expr_child_type) {
436 case IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT:
437 case IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT:
438 {
439 const char *field_name;
440
441 load_expr_op = load_expr_op->next;
442 LTTNG_ASSERT(load_expr_op);
443 LTTNG_ASSERT(load_expr_op->type == IR_LOAD_EXPRESSION_GET_SYMBOL);
444 field_name = load_expr_op->u.symbol;
445 LTTNG_ASSERT(field_name);
446
447 event_expr = load_expr_child_type == IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT ?
448 lttng_event_expr_event_payload_field_create(field_name) :
449 lttng_event_expr_channel_context_field_create(field_name);
450 if (!event_expr) {
451 ERR("Failed to create %s event expression: field name = `%s`.",
452 load_expr_child_type == IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT ?
453 "payload field" : "channel context",
454 field_name);
455 goto error;
456 }
457
458 break;
459 }
460 case IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT:
461 {
462 const char *colon;
463 const char *type_name;
464 const char *field_name;
465
466 load_expr_op = load_expr_op->next;
467 LTTNG_ASSERT(load_expr_op);
468 LTTNG_ASSERT(load_expr_op->type == IR_LOAD_EXPRESSION_GET_SYMBOL);
469 field_name = load_expr_op->u.symbol;
470 LTTNG_ASSERT(field_name);
471
472 /*
473 * The field name needs to be of the form PROVIDER:TYPE. We
474 * split it here.
475 */
476 colon = strchr(field_name, ':');
477 if (!colon) {
478 ERR("Invalid app-specific context field name: missing colon in `%s`.",
479 field_name);
480 goto error;
481 }
482
483 type_name = colon + 1;
484 if (*type_name == '\0') {
485 ERR("Invalid app-specific context field name: missing type name after colon in `%s`.",
486 field_name);
487 goto error;
488 }
489
490 provider_name = strndup(field_name, colon - field_name);
491 if (!provider_name) {
492 PERROR("Failed to allocate field name string");
493 goto error;
494 }
495
496 event_expr = lttng_event_expr_app_specific_context_field_create(
497 provider_name, type_name);
498 if (!event_expr) {
499 ERR("Failed to create app-specific context field event expression: provider name = `%s`, type name = `%s`",
500 provider_name, type_name);
501 goto error;
502 }
503
504 break;
505 }
506 default:
507 ERR("%s: unexpected load expr type %d.", __func__,
508 load_expr_op->type);
509 abort();
510 }
511
512 load_expr_op = load_expr_op->next;
513
514 /* There may be a single array index after that. */
515 if (load_expr_op->type == IR_LOAD_EXPRESSION_GET_INDEX) {
516 struct lttng_event_expr *index_event_expr;
517 const uint64_t index = load_expr_op->u.index;
518
519 index_event_expr = lttng_event_expr_array_field_element_create(event_expr, index);
520 if (!index_event_expr) {
521 ERR("Failed to create array field element event expression.");
522 goto error;
523 }
524
525 event_expr = index_event_expr;
526 load_expr_op = load_expr_op->next;
527 }
528
529 switch (load_expr_op->type) {
530 case IR_LOAD_EXPRESSION_LOAD_FIELD:
531 /*
532 * This is what we expect, IR_LOAD_EXPRESSION_LOAD_FIELD is
533 * always found at the end of the chain.
534 */
535 break;
536 case IR_LOAD_EXPRESSION_GET_SYMBOL:
537 ERR("While parsing expression `%s`: Capturing subfields is not supported.",
538 capture_str);
539 goto error;
540
541 default:
542 ERR("%s: unexpected load expression operator %s.", __func__,
543 ir_load_expression_type_str(load_expr_op->type));
544 abort();
545 }
546
547 goto end;
548
549 error:
550 lttng_event_expr_destroy(event_expr);
551 event_expr = NULL;
552
553 end:
554 free(provider_name);
555
556 return event_expr;
557 }
558
559 static
560 struct lttng_event_expr *ir_op_load_to_event_expr(
561 const struct ir_op *ir, const char *capture_str)
562 {
563 struct lttng_event_expr *event_expr = NULL;
564
565 LTTNG_ASSERT(ir->op == IR_OP_LOAD);
566
567 switch (ir->data_type) {
568 case IR_DATA_EXPRESSION:
569 {
570 const struct ir_load_expression *ir_load_expr =
571 ir->u.load.u.expression;
572
573 event_expr = ir_op_load_expr_to_event_expr(
574 ir_load_expr, capture_str);
575 break;
576 }
577 default:
578 ERR("%s: unexpected data type: %s.", __func__,
579 ir_data_type_str(ir->data_type));
580 abort();
581 }
582
583 return event_expr;
584 }
585
586 static
587 const char *ir_operator_type_human_str(enum ir_op_type op)
588 {
589 const char *name;
590
591 switch (op) {
592 case IR_OP_BINARY:
593 name = "Binary";
594 break;
595 case IR_OP_UNARY:
596 name = "Unary";
597 break;
598 case IR_OP_LOGICAL:
599 name = "Logical";
600 break;
601 default:
602 abort();
603 }
604
605 return name;
606 }
607
608 static
609 struct lttng_event_expr *ir_op_root_to_event_expr(const struct ir_op *ir,
610 const char *capture_str)
611 {
612 struct lttng_event_expr *event_expr = NULL;
613
614 LTTNG_ASSERT(ir->op == IR_OP_ROOT);
615 ir = ir->u.root.child;
616
617 switch (ir->op) {
618 case IR_OP_LOAD:
619 event_expr = ir_op_load_to_event_expr(ir, capture_str);
620 break;
621 case IR_OP_BINARY:
622 case IR_OP_UNARY:
623 case IR_OP_LOGICAL:
624 ERR("While parsing expression `%s`: %s operators are not allowed in capture expressions.",
625 capture_str,
626 ir_operator_type_human_str(ir->op));
627 break;
628 default:
629 ERR("%s: unexpected IR op type: %s.", __func__,
630 ir_op_type_str(ir->op));
631 abort();
632 }
633
634 return event_expr;
635 }
636
637 static
638 void destroy_event_expr(void *ptr)
639 {
640 lttng_event_expr_destroy((lttng_event_expr *) ptr);
641 }
642
643 struct parse_event_rule_res {
644 /* Owned by this. */
645 struct lttng_event_rule *er;
646
647 /* Array of `struct lttng_event_expr *` */
648 struct lttng_dynamic_pointer_array capture_descriptors;
649 };
650
651 static
652 struct parse_event_rule_res parse_event_rule(int *argc, const char ***argv,
653 int argc_offset)
654 {
655 enum lttng_event_rule_type event_rule_type =
656 LTTNG_EVENT_RULE_TYPE_UNKNOWN;
657 struct argpar_iter *argpar_iter = NULL;
658 const struct argpar_item *argpar_item = NULL;
659 int consumed_args = -1;
660 struct lttng_kernel_probe_location *kernel_probe_location = NULL;
661 struct lttng_userspace_probe_location *userspace_probe_location = NULL;
662 struct parse_event_rule_res res = { 0 };
663 struct lttng_event_expr *event_expr = NULL;
664 struct filter_parser_ctx *parser_ctx = NULL;
665 struct lttng_log_level_rule *log_level_rule = NULL;
666
667 /* Event rule type option */
668 char *event_rule_type_str = NULL;
669
670 /* Tracepoint and syscall options. */
671 char *name = NULL;
672 /* Array of strings. */
673 struct lttng_dynamic_pointer_array exclude_names;
674
675 /* For userspace / kernel probe and function. */
676 char *location = NULL;
677 char *event_name = NULL;
678
679 /* Filter. */
680 char *filter = NULL;
681
682 /* Log level. */
683 char *log_level_str = NULL;
684
685 lttng_dynamic_pointer_array_init(&res.capture_descriptors,
686 destroy_event_expr);
687
688 lttng_dynamic_pointer_array_init(&exclude_names, free);
689
690 argpar_iter = argpar_iter_create(*argc, *argv, event_rule_opt_descrs);
691 if (!argpar_iter) {
692 ERR("Failed to allocate an argpar iter.");
693 goto error;
694 }
695
696 while (true) {
697 enum parse_next_item_status status;
698
699 status = parse_next_item(argpar_iter, &argpar_item,
700 argc_offset, *argv, false, NULL);
701 if (status == PARSE_NEXT_ITEM_STATUS_ERROR) {
702 goto error;
703 } else if (status == PARSE_NEXT_ITEM_STATUS_END) {
704 break;
705 }
706
707 LTTNG_ASSERT(status == PARSE_NEXT_ITEM_STATUS_OK);
708
709 if (argpar_item_type(argpar_item) == ARGPAR_ITEM_TYPE_OPT) {
710 const struct argpar_opt_descr *descr =
711 argpar_item_opt_descr(argpar_item);
712 const char *arg = argpar_item_opt_arg(argpar_item);
713
714 switch (descr->id) {
715 case OPT_TYPE:
716 if (!assign_event_rule_type(&event_rule_type, arg)) {
717 goto error;
718 }
719
720 /* Save the string for later use. */
721 if (!assign_string(&event_rule_type_str, arg,
722 "--type/-t")) {
723 goto error;
724 }
725
726 break;
727 case OPT_LOCATION:
728 if (!assign_string(&location, arg,
729 "--location/-L")) {
730 goto error;
731 }
732
733 break;
734 case OPT_EVENT_NAME:
735 if (!assign_string(&event_name, arg,
736 "--event-name/-E")) {
737 goto error;
738 }
739
740 break;
741 case OPT_FILTER:
742 if (!assign_string(&filter, arg,
743 "--filter/-f")) {
744 goto error;
745 }
746
747 break;
748 case OPT_NAME:
749 if (!assign_string(&name, arg,
750 "--name/-n")) {
751 goto error;
752 }
753
754 break;
755 case OPT_EXCLUDE_NAME:
756 {
757 int ret;
758
759 ret = lttng_dynamic_pointer_array_add_pointer(
760 &exclude_names,
761 strdup(arg));
762 if (ret != 0) {
763 ERR("Failed to add pointer to dynamic pointer array.");
764 goto error;
765 }
766
767 break;
768 }
769 case OPT_LOG_LEVEL:
770 if (!assign_string(&log_level_str, arg,
771 "--log-level/-l")) {
772 goto error;
773 }
774
775 break;
776 case OPT_CAPTURE:
777 {
778 int ret;
779
780 ret = filter_parser_ctx_create_from_filter_expression(
781 arg, &parser_ctx);
782 if (ret) {
783 ERR("Failed to parse capture expression `%s`.", arg);
784 goto error;
785 }
786
787 event_expr = ir_op_root_to_event_expr(
788 parser_ctx->ir_root, arg);
789 if (!event_expr) {
790 /*
791 * ir_op_root_to_event_expr has printed
792 * an error message.
793 */
794 goto error;
795 }
796
797 ret = lttng_dynamic_pointer_array_add_pointer(
798 &res.capture_descriptors,
799 event_expr);
800 if (ret) {
801 goto error;
802 }
803
804 /*
805 * The ownership of event expression was
806 * transferred to the dynamic array.
807 */
808 event_expr = NULL;
809
810 break;
811 }
812 default:
813 abort();
814 }
815 } else {
816 const char *arg = argpar_item_non_opt_arg(argpar_item);
817
818 /* Don't accept non-option arguments. */
819 ERR("Unexpected argument '%s'", arg);
820 goto error;
821 }
822 }
823
824 if (event_rule_type == LTTNG_EVENT_RULE_TYPE_UNKNOWN) {
825 ERR("Event rule requires a --type.");
826 goto error;
827 }
828
829 /*
830 * Option --name is applicable to event rules of type kernel, user, jul,
831 * log4j,python and syscall. If --name is omitted, it is implicitly
832 * "*".
833 */
834 switch (event_rule_type) {
835 case LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT:
836 case LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT:
837 case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
838 case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
839 case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
840 case LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL:
841 if (!name) {
842 name = strdup("*");
843 }
844 break;
845
846 default:
847 if (name) {
848 ERR("Can't use --name with %s event rules.",
849 lttng_event_rule_type_str(
850 event_rule_type));
851 goto error;
852 }
853
854 if (lttng_dynamic_pointer_array_get_count(&exclude_names) > 0) {
855 ERR("Can't use --exclude-name/-x with %s event rules.",
856 lttng_event_rule_type_str(
857 event_rule_type));
858 goto error;
859 }
860 }
861
862 /*
863 * Option --location is only applicable to (and mandatory for) event
864 * rules of type {k,u}probe and function.
865 *
866 * Option --event-name is only applicable to event rules of type probe.
867 * If omitted, it defaults to the location.
868 */
869 switch (event_rule_type) {
870 case LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE:
871 case LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE:
872 if (!location) {
873 ERR("Event rule of type %s requires a --location.",
874 lttng_event_rule_type_str(event_rule_type));
875 goto error;
876 }
877
878 if (!event_name) {
879 event_name = strdup(location);
880 }
881
882 break;
883
884 default:
885 if (location) {
886 ERR("Can't use --location with %s event rules.",
887 lttng_event_rule_type_str(event_rule_type));
888 goto error;
889 }
890
891 if (event_name) {
892 ERR("Can't use --event-name with %s event rules.",
893 lttng_event_rule_type_str(
894 event_rule_type));
895 goto error;
896 }
897 }
898
899 /*
900 * Update *argc and *argv so our caller can keep parsing what follows.
901 */
902 consumed_args = argpar_iter_ingested_orig_args(argpar_iter);
903 LTTNG_ASSERT(consumed_args >= 0);
904 *argc -= consumed_args;
905 *argv += consumed_args;
906
907 /*
908 * Adding a filter to a probe, function or userspace-probe would be
909 * denied by the kernel tracer as it's not supported at the moment. We
910 * do an early check here to warn the user.
911 */
912 if (filter) {
913 switch (event_rule_type) {
914 case LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT:
915 case LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT:
916 case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
917 case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
918 case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
919 case LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL:
920 break;
921 default:
922 ERR("Filter expressions are not supported for %s event rules.",
923 lttng_event_rule_type_str(event_rule_type));
924 goto error;
925 }
926 }
927
928 /*
929 * If --exclude-name/-x was passed, split it into an exclusion list.
930 * Exclusions are only supported by
931 * LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT for now.
932 */
933 if (lttng_dynamic_pointer_array_get_count(&exclude_names) > 0) {
934 if (event_rule_type != LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT) {
935 ERR("Event name exclusions are not yet implemented for %s event rules.",
936 lttng_event_rule_type_str(event_rule_type));
937 goto error;
938 }
939
940 if (validate_exclusion_list(name, &exclude_names) != 0) {
941 /*
942 * Assume validate_exclusion_list already prints an
943 * error message.
944 */
945 goto error;
946 }
947 }
948
949 if (log_level_str) {
950 switch (event_rule_type) {
951 case LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT:
952 case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
953 case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
954 case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
955 {
956 int log_level;
957 bool log_level_only;
958
959 if (strcmp(log_level_str, "..") == 0) {
960 /*
961 * ".." is the same as passing no log level
962 * option and correspond to the "ANY" case.
963 */
964 break;
965 }
966
967 if (!parse_log_level_string(log_level_str, event_rule_type,
968 &log_level, &log_level_only)) {
969 ERR("Failed to parse log level string `%s`.",
970 log_level_str);
971 goto error;
972 }
973
974 if (log_level_only) {
975 log_level_rule = lttng_log_level_rule_exactly_create(log_level);
976 } else {
977 log_level_rule = lttng_log_level_rule_at_least_as_severe_as_create(log_level);
978 }
979
980 if (log_level_rule == NULL) {
981 ERR("Failed to create log level rule object.");
982 goto error;
983 }
984 break;
985 }
986 default:
987 ERR("Log levels are not supported for %s event rules.",
988 lttng_event_rule_type_str(event_rule_type));
989 goto error;
990 }
991 }
992
993 /* Finally, create the event rule object. */
994 switch (event_rule_type) {
995 case LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT:
996 {
997 enum lttng_event_rule_status event_rule_status;
998
999 res.er = lttng_event_rule_user_tracepoint_create();
1000 if (!res.er) {
1001 ERR("Failed to create user_tracepoint event rule.");
1002 goto error;
1003 }
1004
1005 /* Set pattern. */
1006 event_rule_status = lttng_event_rule_user_tracepoint_set_name_pattern(
1007 res.er, name);
1008 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1009 ERR("Failed to set user_tracepoint event rule's pattern to '%s'.",
1010 name);
1011 goto error;
1012 }
1013
1014 /* Set filter. */
1015 if (filter) {
1016 event_rule_status = lttng_event_rule_user_tracepoint_set_filter(
1017 res.er, filter);
1018 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1019 ERR("Failed to set user_tracepoint event rule's filter to '%s'.",
1020 filter);
1021 goto error;
1022 }
1023 }
1024
1025 /* Set exclusion list. */
1026 if (lttng_dynamic_pointer_array_get_count(&exclude_names) > 0) {
1027 int n;
1028 int count = lttng_dynamic_pointer_array_get_count(
1029 &exclude_names);
1030
1031 for (n = 0; n < count; n++) {
1032 const char *exclude_name =
1033 (const char *) lttng_dynamic_pointer_array_get_pointer(
1034 &exclude_names,
1035 n);
1036
1037 event_rule_status =
1038 lttng_event_rule_user_tracepoint_add_name_pattern_exclusion(
1039 res.er,
1040 exclude_name);
1041 if (event_rule_status !=
1042 LTTNG_EVENT_RULE_STATUS_OK) {
1043 ERR("Failed to set user_tracepoint exclusion list element '%s'",
1044 exclude_name);
1045 goto error;
1046 }
1047 }
1048 }
1049
1050 if (log_level_rule) {
1051 event_rule_status =
1052 lttng_event_rule_user_tracepoint_set_log_level_rule(
1053 res.er, log_level_rule);
1054
1055 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1056 ERR("Failed to set log level on event fule.");
1057 goto error;
1058 }
1059 }
1060
1061 break;
1062 }
1063 case LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT:
1064 {
1065 enum lttng_event_rule_status event_rule_status;
1066
1067 res.er = lttng_event_rule_kernel_tracepoint_create();
1068 if (!res.er) {
1069 ERR("Failed to create kernel_tracepoint event rule.");
1070 goto error;
1071 }
1072
1073 /* Set pattern. */
1074 event_rule_status = lttng_event_rule_kernel_tracepoint_set_name_pattern(
1075 res.er, name);
1076 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1077 ERR("Failed to set kernel_tracepoint event rule's pattern to '%s'.",
1078 name);
1079 goto error;
1080 }
1081
1082 /* Set filter. */
1083 if (filter) {
1084 event_rule_status = lttng_event_rule_kernel_tracepoint_set_filter(
1085 res.er, filter);
1086 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1087 ERR("Failed to set kernel_tracepoint event rule's filter to '%s'.",
1088 filter);
1089 goto error;
1090 }
1091 }
1092 break;
1093 }
1094 case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
1095 {
1096 enum lttng_event_rule_status event_rule_status;
1097
1098 res.er = lttng_event_rule_jul_logging_create();
1099 if (!res.er) {
1100 ERR("Failed to create jul_logging event rule.");
1101 goto error;
1102 }
1103
1104 /* Set pattern. */
1105 event_rule_status = lttng_event_rule_jul_logging_set_name_pattern(
1106 res.er, name);
1107 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1108 ERR("Failed to set jul_logging event rule's pattern to '%s'.",
1109 name);
1110 goto error;
1111 }
1112
1113 /* Set filter. */
1114 if (filter) {
1115 event_rule_status = lttng_event_rule_jul_logging_set_filter(
1116 res.er, filter);
1117 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1118 ERR("Failed to set jul_logging event rule's filter to '%s'.",
1119 filter);
1120 goto error;
1121 }
1122 }
1123
1124 if (log_level_rule) {
1125 event_rule_status =
1126 lttng_event_rule_jul_logging_set_log_level_rule(
1127 res.er, log_level_rule);
1128
1129 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1130 ERR("Failed to set log level on event fule.");
1131 goto error;
1132 }
1133 }
1134 break;
1135 }
1136 case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
1137 {
1138 enum lttng_event_rule_status event_rule_status;
1139
1140 res.er = lttng_event_rule_log4j_logging_create();
1141 if (!res.er) {
1142 ERR("Failed to create jul_logging event rule.");
1143 goto error;
1144 }
1145
1146 /* Set pattern. */
1147 event_rule_status = lttng_event_rule_log4j_logging_set_name_pattern(
1148 res.er, name);
1149 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1150 ERR("Failed to set jul_logging event rule's pattern to '%s'.",
1151 name);
1152 goto error;
1153 }
1154
1155 /* Set filter. */
1156 if (filter) {
1157 event_rule_status = lttng_event_rule_log4j_logging_set_filter(
1158 res.er, filter);
1159 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1160 ERR("Failed to set jul_logging event rule's filter to '%s'.",
1161 filter);
1162 goto error;
1163 }
1164 }
1165
1166 if (log_level_rule) {
1167 event_rule_status =
1168 lttng_event_rule_log4j_logging_set_log_level_rule(
1169 res.er, log_level_rule);
1170
1171 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1172 ERR("Failed to set log level on event fule.");
1173 goto error;
1174 }
1175 }
1176 break;
1177 }
1178 case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
1179 {
1180 enum lttng_event_rule_status event_rule_status;
1181
1182 res.er = lttng_event_rule_python_logging_create();
1183 if (!res.er) {
1184 ERR("Failed to create jul_logging event rule.");
1185 goto error;
1186 }
1187
1188 /* Set pattern. */
1189 event_rule_status = lttng_event_rule_python_logging_set_name_pattern(
1190 res.er, name);
1191 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1192 ERR("Failed to set jul_logging event rule's pattern to '%s'.",
1193 name);
1194 goto error;
1195 }
1196
1197 /* Set filter. */
1198 if (filter) {
1199 event_rule_status = lttng_event_rule_python_logging_set_filter(
1200 res.er, filter);
1201 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1202 ERR("Failed to set jul_logging event rule's filter to '%s'.",
1203 filter);
1204 goto error;
1205 }
1206 }
1207
1208 if (log_level_rule) {
1209 event_rule_status =
1210 lttng_event_rule_python_logging_set_log_level_rule(
1211 res.er, log_level_rule);
1212
1213 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1214 ERR("Failed to set log level on event fule.");
1215 goto error;
1216 }
1217 }
1218 break;
1219 }
1220 case LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE:
1221 {
1222 int ret;
1223 enum lttng_event_rule_status event_rule_status;
1224
1225 ret = parse_kernel_probe_opts(
1226 location, &kernel_probe_location);
1227 if (ret) {
1228 ERR("Failed to parse kernel probe location.");
1229 goto error;
1230 }
1231
1232 LTTNG_ASSERT(kernel_probe_location);
1233 res.er = lttng_event_rule_kernel_kprobe_create(kernel_probe_location);
1234 if (!res.er) {
1235 ERR("Failed to create kprobe event rule.");
1236 goto error;
1237 }
1238
1239 event_rule_status =
1240 lttng_event_rule_kernel_kprobe_set_event_name(
1241 res.er, event_name);
1242 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1243 ERR("Failed to set kprobe event rule's name to '%s'.",
1244 event_name);
1245 goto error;
1246 }
1247
1248 break;
1249 }
1250 case LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE:
1251 {
1252 int ret;
1253 enum lttng_event_rule_status event_rule_status;
1254
1255 ret = parse_userspace_probe_opts(
1256 location, &userspace_probe_location);
1257 if (ret) {
1258 ERR("Failed to parse user space probe location.");
1259 goto error;
1260 }
1261
1262 res.er = lttng_event_rule_kernel_uprobe_create(userspace_probe_location);
1263 if (!res.er) {
1264 ERR("Failed to create userspace probe event rule.");
1265 goto error;
1266 }
1267
1268 event_rule_status =
1269 lttng_event_rule_kernel_uprobe_set_event_name(
1270 res.er, event_name);
1271 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1272 ERR("Failed to set user space probe event rule's name to '%s'.",
1273 event_name);
1274 goto error;
1275 }
1276
1277 break;
1278 }
1279 case LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL:
1280 {
1281 enum lttng_event_rule_status event_rule_status;
1282 enum lttng_event_rule_kernel_syscall_emission_site emission_site;
1283
1284 if (!parse_syscall_emission_site_from_type(
1285 event_rule_type_str, &emission_site)) {
1286 ERR("Failed to parse syscall type '%s'.", event_rule_type_str);
1287 goto error;
1288 }
1289
1290 res.er = lttng_event_rule_kernel_syscall_create(emission_site);
1291 if (!res.er) {
1292 ERR("Failed to create syscall event rule.");
1293 goto error;
1294 }
1295
1296 event_rule_status = lttng_event_rule_kernel_syscall_set_name_pattern(
1297 res.er, name);
1298 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1299 ERR("Failed to set syscall event rule's pattern to '%s'.",
1300 name);
1301 goto error;
1302 }
1303
1304 if (filter) {
1305 event_rule_status = lttng_event_rule_kernel_syscall_set_filter(
1306 res.er, filter);
1307 if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
1308 ERR("Failed to set syscall event rule's filter to '%s'.",
1309 filter);
1310 goto error;
1311 }
1312 }
1313
1314 break;
1315 }
1316 default:
1317 abort();
1318 goto error;
1319 }
1320
1321 goto end;
1322
1323 error:
1324 lttng_event_rule_destroy(res.er);
1325 res.er = NULL;
1326 lttng_dynamic_pointer_array_reset(&res.capture_descriptors);
1327
1328 end:
1329 if (parser_ctx) {
1330 filter_parser_ctx_free(parser_ctx);
1331 }
1332
1333 lttng_event_expr_destroy(event_expr);
1334 argpar_item_destroy(argpar_item);
1335 argpar_iter_destroy(argpar_iter);
1336 free(filter);
1337 free(name);
1338 lttng_dynamic_pointer_array_reset(&exclude_names);
1339 free(log_level_str);
1340 free(location);
1341 free(event_name);
1342 free(event_rule_type_str);
1343
1344 lttng_kernel_probe_location_destroy(kernel_probe_location);
1345 lttng_userspace_probe_location_destroy(userspace_probe_location);
1346 lttng_log_level_rule_destroy(log_level_rule);
1347 return res;
1348 }
1349
1350 static
1351 struct lttng_condition *handle_condition_event(int *argc, const char ***argv,
1352 int argc_offset)
1353 {
1354 struct parse_event_rule_res res;
1355 struct lttng_condition *c;
1356 size_t i;
1357
1358 res = parse_event_rule(argc, argv, argc_offset);
1359 if (!res.er) {
1360 c = NULL;
1361 goto error;
1362 }
1363
1364 c = lttng_condition_event_rule_matches_create(res.er);
1365 lttng_event_rule_destroy(res.er);
1366 res.er = NULL;
1367 if (!c) {
1368 goto error;
1369 }
1370
1371 for (i = 0; i < lttng_dynamic_pointer_array_get_count(&res.capture_descriptors);
1372 i++) {
1373 enum lttng_condition_status status;
1374 struct lttng_event_expr **expr =
1375 (lttng_event_expr **) lttng_dynamic_array_get_element(
1376 &res.capture_descriptors.array, i);
1377
1378 LTTNG_ASSERT(expr);
1379 LTTNG_ASSERT(*expr);
1380 status = lttng_condition_event_rule_matches_append_capture_descriptor(
1381 c, *expr);
1382 if (status != LTTNG_CONDITION_STATUS_OK) {
1383 if (status == LTTNG_CONDITION_STATUS_UNSUPPORTED) {
1384 ERR("The capture feature is unsupported by the event-rule condition type");
1385 }
1386
1387 goto error;
1388 }
1389
1390 /* Ownership of event expression moved to `c` */
1391 *expr = NULL;
1392 }
1393
1394 goto end;
1395
1396 error:
1397 lttng_condition_destroy(c);
1398 c = NULL;
1399
1400 end:
1401 lttng_dynamic_pointer_array_reset(&res.capture_descriptors);
1402 lttng_event_rule_destroy(res.er);
1403 return c;
1404 }
1405
1406 struct condition_descr {
1407 const char *name;
1408 struct lttng_condition *(*handler) (int *argc, const char ***argv,
1409 int argc_offset);
1410 };
1411
1412 static const
1413 struct condition_descr condition_descrs[] = {
1414 { "event-rule-matches", handle_condition_event },
1415 };
1416
1417 static
1418 struct lttng_condition *parse_condition(const char *condition_name, int *argc,
1419 const char ***argv, int argc_offset)
1420 {
1421 int i;
1422 struct lttng_condition *cond;
1423 const struct condition_descr *descr = NULL;
1424
1425 for (i = 0; i < ARRAY_SIZE(condition_descrs); i++) {
1426 if (strcmp(condition_name, condition_descrs[i].name) == 0) {
1427 descr = &condition_descrs[i];
1428 break;
1429 }
1430 }
1431
1432 if (!descr) {
1433 ERR("Unknown condition name '%s'", condition_name);
1434 goto error;
1435 }
1436
1437 cond = descr->handler(argc, argv, argc_offset);
1438 if (!cond) {
1439 /* The handler has already printed an error message. */
1440 goto error;
1441 }
1442
1443 goto end;
1444 error:
1445 cond = NULL;
1446 end:
1447 return cond;
1448 }
1449
1450 static struct lttng_rate_policy *parse_rate_policy(const char *policy_str)
1451 {
1452 int ret;
1453 size_t num_token = 0;
1454 struct lttng_dynamic_pointer_array tokens;
1455 struct lttng_rate_policy *policy = NULL;
1456 enum lttng_rate_policy_type policy_type;
1457 unsigned long long value;
1458 char *policy_type_str;
1459 char *policy_value_str;
1460
1461 LTTNG_ASSERT(policy_str);
1462 lttng_dynamic_pointer_array_init(&tokens, NULL);
1463
1464 /* Rate policy fields are separated by ':'. */
1465 ret = strutils_split(policy_str, ':', 1, &tokens);
1466 if (ret == 0) {
1467 num_token = lttng_dynamic_pointer_array_get_count(&tokens);
1468 }
1469
1470 /*
1471 * Early sanity check that the number of parameter is exactly 2.
1472 * i.e : type:value
1473 */
1474 if (num_token != 2) {
1475 ERR("Rate policy format is invalid.");
1476 goto end;
1477 }
1478
1479 policy_type_str = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0);
1480 policy_value_str = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
1481
1482 /* Parse the type. */
1483 if (strcmp(policy_type_str, "once-after") == 0) {
1484 policy_type = LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N;
1485 } else if (strcmp(policy_type_str, "every") == 0) {
1486 policy_type = LTTNG_RATE_POLICY_TYPE_EVERY_N;
1487 } else {
1488 ERR("Rate policy type `%s` unknown.", policy_type_str);
1489 goto end;
1490 }
1491
1492 /* Parse the value. */
1493 if (utils_parse_unsigned_long_long(policy_value_str, &value) != 0) {
1494 ERR("Failed to parse rate policy value `%s` as an integer.",
1495 policy_value_str);
1496 goto end;
1497 }
1498
1499 if (value == 0) {
1500 ERR("Rate policy value `%s` must be > 0.", policy_value_str);
1501 goto end;
1502 }
1503
1504 switch (policy_type) {
1505 case LTTNG_RATE_POLICY_TYPE_EVERY_N:
1506 policy = lttng_rate_policy_every_n_create(value);
1507 break;
1508 case LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N:
1509 policy = lttng_rate_policy_once_after_n_create(value);
1510 break;
1511 default:
1512 abort();
1513 }
1514
1515 if (policy == NULL) {
1516 ERR("Failed to create rate policy `%s`.", policy_str);
1517 }
1518
1519 end:
1520 lttng_dynamic_pointer_array_reset(&tokens);
1521 return policy;
1522 }
1523
1524 static const struct argpar_opt_descr notify_action_opt_descrs[] = {
1525 { OPT_RATE_POLICY, '\0', "rate-policy", true },
1526 ARGPAR_OPT_DESCR_SENTINEL
1527 };
1528
1529 static
1530 struct lttng_action *handle_action_notify(int *argc, const char ***argv,
1531 int argc_offset)
1532 {
1533 struct lttng_action *action = NULL;
1534 struct argpar_iter *argpar_iter = NULL;
1535 const struct argpar_item *argpar_item = NULL;
1536 struct lttng_rate_policy *policy = NULL;
1537
1538 argpar_iter = argpar_iter_create(*argc, *argv, notify_action_opt_descrs);
1539 if (!argpar_iter) {
1540 ERR("Failed to allocate an argpar iter.");
1541 goto error;
1542 }
1543
1544 while (true) {
1545 enum parse_next_item_status status;
1546
1547 status = parse_next_item(argpar_iter, &argpar_item,
1548 argc_offset, *argv, false,
1549 "While parsing `notify` action:");
1550 if (status == PARSE_NEXT_ITEM_STATUS_ERROR) {
1551 goto error;
1552 } else if (status == PARSE_NEXT_ITEM_STATUS_END) {
1553 break;
1554 }
1555
1556 LTTNG_ASSERT(status == PARSE_NEXT_ITEM_STATUS_OK);
1557
1558 if (argpar_item_type(argpar_item) == ARGPAR_ITEM_TYPE_OPT) {
1559 const struct argpar_opt_descr *descr =
1560 argpar_item_opt_descr(argpar_item);
1561 const char *arg = argpar_item_opt_arg(argpar_item);
1562
1563 switch (descr->id) {
1564 case OPT_RATE_POLICY:
1565 {
1566 policy = parse_rate_policy(arg);
1567 if (!policy) {
1568 goto error;
1569 }
1570 break;
1571 }
1572 default:
1573 abort();
1574 }
1575 } else {
1576 const char *arg = argpar_item_non_opt_arg(argpar_item);
1577
1578 ERR("Unexpected argument `%s`.", arg);
1579 goto error;
1580 }
1581 }
1582
1583 *argc -= argpar_iter_ingested_orig_args(argpar_iter);
1584 *argv += argpar_iter_ingested_orig_args(argpar_iter);
1585
1586 action = lttng_action_notify_create();
1587 if (!action) {
1588 ERR("Failed to create notify action");
1589 goto error;
1590 }
1591
1592 if (policy) {
1593 enum lttng_action_status status;
1594 status = lttng_action_notify_set_rate_policy(action, policy);
1595 if (status != LTTNG_ACTION_STATUS_OK) {
1596 ERR("Failed to set rate policy");
1597 goto error;
1598 }
1599 }
1600
1601 goto end;
1602
1603 error:
1604 lttng_action_destroy(action);
1605 action = NULL;
1606 end:
1607 lttng_rate_policy_destroy(policy);
1608 argpar_item_destroy(argpar_item);
1609 argpar_iter_destroy(argpar_iter);
1610 return action;
1611 }
1612
1613 /*
1614 * Generic handler for a kind of action that takes a session name and an
1615 * optional rate policy.
1616 */
1617
1618 static struct lttng_action *handle_action_simple_session_with_policy(int *argc,
1619 const char ***argv,
1620 int argc_offset,
1621 struct lttng_action *(*create_action_cb)(void),
1622 enum lttng_action_status (*set_session_name_cb)(
1623 struct lttng_action *, const char *),
1624 enum lttng_action_status (*set_rate_policy_cb)(
1625 struct lttng_action *,
1626 const struct lttng_rate_policy *),
1627 const char *action_name)
1628 {
1629 struct lttng_action *action = NULL;
1630 struct argpar_iter *argpar_iter = NULL;
1631 const struct argpar_item *argpar_item = NULL;
1632 const char *session_name_arg = NULL;
1633 enum lttng_action_status action_status;
1634 struct lttng_rate_policy *policy = NULL;
1635
1636 LTTNG_ASSERT(set_session_name_cb);
1637 LTTNG_ASSERT(set_rate_policy_cb);
1638
1639 const struct argpar_opt_descr rate_policy_opt_descrs[] = {
1640 { OPT_RATE_POLICY, '\0', "rate-policy", true },
1641 ARGPAR_OPT_DESCR_SENTINEL
1642 };
1643
1644 argpar_iter = argpar_iter_create(*argc, *argv, rate_policy_opt_descrs);
1645 if (!argpar_iter) {
1646 ERR("Failed to allocate an argpar iter.");
1647 goto error;
1648 }
1649
1650 while (true) {
1651 enum parse_next_item_status status;
1652
1653 status = parse_next_item(argpar_iter, &argpar_item, argc_offset,
1654 *argv, false,
1655 "While parsing `%s` action:", action_name);
1656 if (status == PARSE_NEXT_ITEM_STATUS_ERROR) {
1657 goto error;
1658 } else if (status == PARSE_NEXT_ITEM_STATUS_END) {
1659 break;
1660 }
1661
1662 LTTNG_ASSERT(status == PARSE_NEXT_ITEM_STATUS_OK);
1663
1664 if (argpar_item_type(argpar_item) == ARGPAR_ITEM_TYPE_OPT) {
1665 const struct argpar_opt_descr *descr =
1666 argpar_item_opt_descr(argpar_item);
1667 const char *arg = argpar_item_opt_arg(argpar_item);
1668
1669 switch (descr->id) {
1670 case OPT_RATE_POLICY:
1671 {
1672 policy = parse_rate_policy(arg);
1673 if (!policy) {
1674 goto error;
1675 }
1676 break;
1677 }
1678 default:
1679 abort();
1680 }
1681 } else {
1682 const char *arg = argpar_item_non_opt_arg(argpar_item);
1683 unsigned int idx = argpar_item_non_opt_non_opt_index(argpar_item);
1684
1685 switch (idx) {
1686 case 0:
1687 session_name_arg = arg;
1688 break;
1689 default:
1690 ERR("Unexpected argument `%s`.", arg);
1691 goto error;
1692 }
1693 }
1694 }
1695
1696 *argc -= argpar_iter_ingested_orig_args(argpar_iter);
1697 *argv += argpar_iter_ingested_orig_args(argpar_iter);
1698
1699 if (!session_name_arg) {
1700 ERR("Missing session name.");
1701 goto error;
1702 }
1703
1704 action = create_action_cb();
1705 if (!action) {
1706 ERR("Failed to allocate %s session action.", action_name);
1707 goto error;
1708 }
1709
1710 action_status = set_session_name_cb(action, session_name_arg);
1711 if (action_status != LTTNG_ACTION_STATUS_OK) {
1712 ERR("Failed to set action %s session's session name to '%s'.",
1713 action_name, session_name_arg);
1714 goto error;
1715 }
1716
1717 if (policy) {
1718 action_status = set_rate_policy_cb(action, policy);
1719 if (action_status != LTTNG_ACTION_STATUS_OK) {
1720 ERR("Failed to set rate policy");
1721 goto error;
1722 }
1723 }
1724
1725 goto end;
1726
1727 error:
1728 lttng_action_destroy(action);
1729 action = NULL;
1730
1731 end:
1732 lttng_rate_policy_destroy(policy);
1733 argpar_item_destroy(argpar_item);
1734 argpar_iter_destroy(argpar_iter);
1735 return action;
1736 }
1737
1738 static
1739 struct lttng_action *handle_action_start_session(int *argc,
1740 const char ***argv, int argc_offset)
1741 {
1742 return handle_action_simple_session_with_policy(argc, argv,
1743 argc_offset,
1744 lttng_action_start_session_create,
1745 lttng_action_start_session_set_session_name,
1746 lttng_action_start_session_set_rate_policy, "start");
1747 }
1748
1749 static
1750 struct lttng_action *handle_action_stop_session(int *argc,
1751 const char ***argv, int argc_offset)
1752 {
1753 return handle_action_simple_session_with_policy(argc, argv,
1754 argc_offset,
1755 lttng_action_stop_session_create,
1756 lttng_action_stop_session_set_session_name,
1757 lttng_action_stop_session_set_rate_policy, "stop");
1758 }
1759
1760 static
1761 struct lttng_action *handle_action_rotate_session(int *argc,
1762 const char ***argv, int argc_offset)
1763 {
1764 return handle_action_simple_session_with_policy(argc, argv,
1765 argc_offset,
1766 lttng_action_rotate_session_create,
1767 lttng_action_rotate_session_set_session_name,
1768 lttng_action_rotate_session_set_rate_policy,
1769 "rotate");
1770 }
1771
1772 static const struct argpar_opt_descr snapshot_action_opt_descrs[] = {
1773 { OPT_NAME, 'n', "name", true },
1774 { OPT_MAX_SIZE, 'm', "max-size", true },
1775 { OPT_CTRL_URL, '\0', "ctrl-url", true },
1776 { OPT_DATA_URL, '\0', "data-url", true },
1777 { OPT_URL, '\0', "url", true },
1778 { OPT_PATH, '\0', "path", true },
1779 { OPT_RATE_POLICY, '\0', "rate-policy", true },
1780 ARGPAR_OPT_DESCR_SENTINEL
1781 };
1782
1783 static
1784 struct lttng_action *handle_action_snapshot_session(int *argc,
1785 const char ***argv, int argc_offset)
1786 {
1787 struct lttng_action *action = NULL;
1788 struct argpar_iter *argpar_iter = NULL;
1789 const struct argpar_item *argpar_item = NULL;
1790 const char *session_name_arg = NULL;
1791 char *snapshot_name_arg = NULL;
1792 char *ctrl_url_arg = NULL;
1793 char *data_url_arg = NULL;
1794 char *max_size_arg = NULL;
1795 char *url_arg = NULL;
1796 char *path_arg = NULL;
1797 char *error = NULL;
1798 enum lttng_action_status action_status;
1799 struct lttng_snapshot_output *snapshot_output = NULL;
1800 struct lttng_rate_policy *policy = NULL;
1801 int ret;
1802 unsigned int locations_specified = 0;
1803
1804 argpar_iter = argpar_iter_create(*argc, *argv, snapshot_action_opt_descrs);
1805 if (!argpar_iter) {
1806 ERR("Failed to allocate an argpar iter.");
1807 goto error;
1808 }
1809
1810 while (true) {
1811 enum parse_next_item_status status;
1812
1813 status = parse_next_item(argpar_iter, &argpar_item, argc_offset,
1814 *argv, false, "While parsing `snapshot` action:");
1815 if (status == PARSE_NEXT_ITEM_STATUS_ERROR) {
1816 goto error;
1817 } else if (status == PARSE_NEXT_ITEM_STATUS_END) {
1818 break;
1819 }
1820
1821 LTTNG_ASSERT(status == PARSE_NEXT_ITEM_STATUS_OK);
1822
1823 if (argpar_item_type(argpar_item) == ARGPAR_ITEM_TYPE_OPT) {
1824 const struct argpar_opt_descr *descr =
1825 argpar_item_opt_descr(argpar_item);
1826 const char *arg = argpar_item_opt_arg(argpar_item);
1827
1828 switch (descr->id) {
1829 case OPT_NAME:
1830 if (!assign_string(&snapshot_name_arg, arg, "--name/-n")) {
1831 goto error;
1832 }
1833
1834 break;
1835 case OPT_MAX_SIZE:
1836 if (!assign_string(&max_size_arg, arg, "--max-size/-m")) {
1837 goto error;
1838 }
1839
1840 break;
1841 case OPT_CTRL_URL:
1842 if (!assign_string(&ctrl_url_arg, arg, "--ctrl-url")) {
1843 goto error;
1844 }
1845
1846 break;
1847 case OPT_DATA_URL:
1848 if (!assign_string(&data_url_arg, arg, "--data-url")) {
1849 goto error;
1850 }
1851
1852 break;
1853 case OPT_URL:
1854 if (!assign_string(&url_arg, arg, "--url")) {
1855 goto error;
1856 }
1857
1858 break;
1859 case OPT_PATH:
1860 if (!assign_string(&path_arg, arg, "--path")) {
1861 goto error;
1862 }
1863
1864 break;
1865 case OPT_RATE_POLICY:
1866 {
1867 policy = parse_rate_policy(arg);
1868 if (!policy) {
1869 goto error;
1870 }
1871 break;
1872 }
1873 default:
1874 abort();
1875 }
1876 } else {
1877 const char *arg = argpar_item_non_opt_arg(argpar_item);
1878 const unsigned int idx = argpar_item_non_opt_non_opt_index(argpar_item);
1879
1880 switch (idx) {
1881 case 0:
1882 session_name_arg = arg;
1883 break;
1884 default:
1885 ERR("Unexpected argument `%s`.", arg);
1886 goto error;
1887 }
1888 }
1889 }
1890
1891 *argc -= argpar_iter_ingested_orig_args(argpar_iter);
1892 *argv += argpar_iter_ingested_orig_args(argpar_iter);
1893
1894 if (!session_name_arg) {
1895 ERR("Missing session name.");
1896 goto error;
1897 }
1898
1899 /* --ctrl-url and --data-url must come in pair. */
1900 if (ctrl_url_arg && !data_url_arg) {
1901 ERR("--ctrl-url is specified, but --data-url is missing.");
1902 goto error;
1903 }
1904
1905 if (!ctrl_url_arg && data_url_arg) {
1906 ERR("--data-url is specified, but --ctrl-url is missing.");
1907 goto error;
1908 }
1909
1910 locations_specified += !!(ctrl_url_arg || data_url_arg);
1911 locations_specified += !!url_arg;
1912 locations_specified += !!path_arg;
1913
1914 /* --ctrl-url/--data-url, --url and --path are mutually exclusive. */
1915 if (locations_specified > 1) {
1916 ERR("The --ctrl-url/--data-url, --url, and --path options can't be used together.");
1917 goto error;
1918 }
1919
1920 /*
1921 * Did the user specify an option that implies using a
1922 * custom/unregistered output?
1923 */
1924 if (url_arg || ctrl_url_arg || path_arg) {
1925 snapshot_output = lttng_snapshot_output_create();
1926 if (!snapshot_output) {
1927 ERR("Failed to allocate a snapshot output.");
1928 goto error;
1929 }
1930 }
1931
1932 action = lttng_action_snapshot_session_create();
1933 if (!action) {
1934 ERR("Failed to allocate snapshot session action.");
1935 goto error;
1936 }
1937
1938 action_status = lttng_action_snapshot_session_set_session_name(
1939 action, session_name_arg);
1940 if (action_status != LTTNG_ACTION_STATUS_OK) {
1941 ERR("Failed to set action snapshot session's session name to '%s'.",
1942 session_name_arg);
1943 goto error;
1944 }
1945
1946 if (snapshot_name_arg) {
1947 if (!snapshot_output) {
1948 ERR("Can't provide a snapshot output name without a snapshot output destination.");
1949 goto error;
1950 }
1951
1952 ret = lttng_snapshot_output_set_name(
1953 snapshot_name_arg, snapshot_output);
1954 if (ret != 0) {
1955 ERR("Failed to set name of snapshot output.");
1956 goto error;
1957 }
1958 }
1959
1960 if (max_size_arg) {
1961 uint64_t max_size;
1962
1963 if (!snapshot_output) {
1964 ERR("Can't provide a snapshot output max size without a snapshot output destination.");
1965 goto error;
1966 }
1967
1968 ret = utils_parse_size_suffix(max_size_arg, &max_size);
1969 if (ret != 0) {
1970 ERR("Failed to parse `%s` as a size.", max_size_arg);
1971 goto error;
1972 }
1973
1974 ret = lttng_snapshot_output_set_size(max_size, snapshot_output);
1975 if (ret != 0) {
1976 ERR("Failed to set snapshot output's max size to %" PRIu64 " bytes.",
1977 max_size);
1978 goto error;
1979 }
1980 }
1981
1982 if (url_arg) {
1983 int num_uris;
1984 struct lttng_uri *uris;
1985
1986 if (!strstr(url_arg, "://")) {
1987 ERR("Failed to parse '%s' as an URL.", url_arg);
1988 goto error;
1989 }
1990
1991 num_uris = uri_parse_str_urls(url_arg, NULL, &uris);
1992 if (num_uris < 1) {
1993 ERR("Failed to parse '%s' as an URL.", url_arg);
1994 goto error;
1995 }
1996
1997 if (uris[0].dtype == LTTNG_DST_PATH) {
1998 ret = lttng_snapshot_output_set_local_path(
1999 uris[0].dst.path, snapshot_output);
2000 free(uris);
2001 if (ret != 0) {
2002 ERR("Failed to assign '%s' as a local destination.",
2003 url_arg);
2004 goto error;
2005 }
2006 } else {
2007 ret = lttng_snapshot_output_set_network_url(
2008 url_arg, snapshot_output);
2009 free(uris);
2010 if (ret != 0) {
2011 ERR("Failed to assign '%s' as a network URL.",
2012 url_arg);
2013 goto error;
2014 }
2015 }
2016 }
2017
2018 if (path_arg) {
2019 ret = lttng_snapshot_output_set_local_path(
2020 path_arg, snapshot_output);
2021 if (ret != 0) {
2022 ERR("Failed to parse '%s' as a local path.", path_arg);
2023 goto error;
2024 }
2025 }
2026
2027 if (ctrl_url_arg) {
2028 /*
2029 * Two argument form, network output with separate control and
2030 * data URLs.
2031 */
2032 ret = lttng_snapshot_output_set_network_urls(
2033 ctrl_url_arg, data_url_arg, snapshot_output);
2034 if (ret != 0) {
2035 ERR("Failed to parse `%s` and `%s` as control and data URLs.",
2036 ctrl_url_arg, data_url_arg);
2037 goto error;
2038 }
2039 }
2040
2041 if (snapshot_output) {
2042 action_status = lttng_action_snapshot_session_set_output(
2043 action, snapshot_output);
2044 if (action_status != LTTNG_ACTION_STATUS_OK) {
2045 ERR("Failed to set snapshot session action's output.");
2046 goto error;
2047 }
2048
2049 /* Ownership of `snapshot_output` has been transferred to the action. */
2050 snapshot_output = NULL;
2051 }
2052
2053 if (policy) {
2054 enum lttng_action_status status;
2055 status = lttng_action_snapshot_session_set_rate_policy(
2056 action, policy);
2057 if (status != LTTNG_ACTION_STATUS_OK) {
2058 ERR("Failed to set rate policy");
2059 goto error;
2060 }
2061 }
2062
2063 goto end;
2064
2065 error:
2066 lttng_action_destroy(action);
2067 action = NULL;
2068 free(error);
2069 end:
2070 free(snapshot_name_arg);
2071 free(path_arg);
2072 free(url_arg);
2073 free(ctrl_url_arg);
2074 free(data_url_arg);
2075 free(snapshot_output);
2076 free(max_size_arg);
2077 lttng_rate_policy_destroy(policy);
2078 argpar_item_destroy(argpar_item);
2079 argpar_iter_destroy(argpar_iter);
2080 return action;
2081 }
2082
2083 struct action_descr {
2084 const char *name;
2085 struct lttng_action *(*handler) (int *argc, const char ***argv,
2086 int argc_offset);
2087 };
2088
2089 static const
2090 struct action_descr action_descrs[] = {
2091 { "notify", handle_action_notify },
2092 { "start-session", handle_action_start_session },
2093 { "stop-session", handle_action_stop_session },
2094 { "rotate-session", handle_action_rotate_session },
2095 { "snapshot-session", handle_action_snapshot_session },
2096 };
2097
2098 static
2099 struct lttng_action *parse_action(const char *action_name, int *argc,
2100 const char ***argv, int argc_offset)
2101 {
2102 int i;
2103 struct lttng_action *action;
2104 const struct action_descr *descr = NULL;
2105
2106 for (i = 0; i < ARRAY_SIZE(action_descrs); i++) {
2107 if (strcmp(action_name, action_descrs[i].name) == 0) {
2108 descr = &action_descrs[i];
2109 break;
2110 }
2111 }
2112
2113 if (!descr) {
2114 ERR("Unknown action name: %s", action_name);
2115 goto error;
2116 }
2117
2118 action = descr->handler(argc, argv, argc_offset);
2119 if (!action) {
2120 /* The handler has already printed an error message. */
2121 goto error;
2122 }
2123
2124 goto end;
2125 error:
2126 action = NULL;
2127 end:
2128 return action;
2129 }
2130
2131 static const
2132 struct argpar_opt_descr add_trigger_options[] = {
2133 { OPT_HELP, 'h', "help", false },
2134 { OPT_LIST_OPTIONS, '\0', "list-options", false },
2135 { OPT_CONDITION, '\0', "condition", true },
2136 { OPT_ACTION, '\0', "action", true },
2137 { OPT_NAME, '\0', "name", true },
2138 { OPT_OWNER_UID, '\0', "owner-uid", true },
2139 ARGPAR_OPT_DESCR_SENTINEL,
2140 };
2141
2142 static
2143 void lttng_actions_destructor(void *p)
2144 {
2145 struct lttng_action *action = (lttng_action *) p;
2146
2147 lttng_action_destroy(action);
2148 }
2149
2150 int cmd_add_trigger(int argc, const char **argv)
2151 {
2152 int ret;
2153 int my_argc = argc - 1;
2154 const char **my_argv = argv + 1;
2155 struct lttng_condition *condition = NULL;
2156 struct lttng_dynamic_pointer_array actions;
2157 struct argpar_iter *argpar_iter = NULL;
2158 const struct argpar_item *argpar_item = NULL;
2159 struct lttng_action *action_list = NULL;
2160 struct lttng_action *action = NULL;
2161 struct lttng_trigger *trigger = NULL;
2162 char *name = NULL;
2163 int i;
2164 char *owner_uid = NULL;
2165 enum lttng_error_code ret_code;
2166 struct mi_writer *mi_writer = NULL;
2167
2168 lttng_dynamic_pointer_array_init(&actions, lttng_actions_destructor);
2169
2170 if (lttng_opt_mi) {
2171 mi_writer = mi_lttng_writer_create(
2172 fileno(stdout), lttng_opt_mi);
2173 if (!mi_writer) {
2174 ret = CMD_ERROR;
2175 goto error;
2176 }
2177
2178 /* Open command element. */
2179 ret = mi_lttng_writer_command_open(mi_writer,
2180 mi_lttng_element_command_add_trigger);
2181 if (ret) {
2182 ret = CMD_ERROR;
2183 goto error;
2184 }
2185
2186 /* Open output element. */
2187 ret = mi_lttng_writer_open_element(
2188 mi_writer, mi_lttng_element_command_output);
2189 if (ret) {
2190 ret = CMD_ERROR;
2191 goto error;
2192 }
2193 }
2194
2195 while (true) {
2196 enum parse_next_item_status status;
2197 int ingested_args;
2198 const struct argpar_opt_descr *descr;
2199 const char *arg;
2200
2201 argpar_iter_destroy(argpar_iter);
2202 argpar_iter = argpar_iter_create(my_argc, my_argv,
2203 add_trigger_options);
2204 if (!argpar_iter) {
2205 ERR("Failed to create argpar iter.");
2206 goto error;
2207 }
2208
2209 status = parse_next_item(argpar_iter, &argpar_item,
2210 argc - my_argc, my_argv, true, NULL);
2211 if (status == PARSE_NEXT_ITEM_STATUS_ERROR) {
2212 goto error;
2213 } else if (status == PARSE_NEXT_ITEM_STATUS_END) {
2214 break;
2215 }
2216
2217 LTTNG_ASSERT(status == PARSE_NEXT_ITEM_STATUS_OK);
2218
2219 if (argpar_item_type(argpar_item) == ARGPAR_ITEM_TYPE_NON_OPT) {
2220 ERR("Unexpected argument `%s`.",
2221 argpar_item_non_opt_arg(argpar_item));
2222 goto error;
2223 }
2224
2225 ingested_args = argpar_iter_ingested_orig_args(argpar_iter);
2226
2227 my_argc -= ingested_args;
2228 my_argv += ingested_args;
2229
2230 descr = argpar_item_opt_descr(argpar_item);
2231 arg = argpar_item_opt_arg(argpar_item);
2232
2233 switch (descr->id) {
2234 case OPT_HELP:
2235 SHOW_HELP();
2236 ret = 0;
2237 goto end;
2238 case OPT_LIST_OPTIONS:
2239 list_cmd_options_argpar(stdout, add_trigger_options);
2240 ret = 0;
2241 goto end;
2242 case OPT_CONDITION:
2243 {
2244 if (condition) {
2245 ERR("A --condition was already given.");
2246 goto error;
2247 }
2248
2249 condition = parse_condition(arg, &my_argc, &my_argv,
2250 argc - my_argc);
2251 if (!condition) {
2252 /*
2253 * An error message was already printed by
2254 * parse_condition.
2255 */
2256 goto error;
2257 }
2258
2259 break;
2260 }
2261 case OPT_ACTION:
2262 {
2263 action = parse_action(arg, &my_argc, &my_argv,
2264 argc - my_argc);
2265 if (!action) {
2266 /*
2267 * An error message was already printed by
2268 * parse_condition.
2269 */
2270 goto error;
2271 }
2272
2273 ret = lttng_dynamic_pointer_array_add_pointer(
2274 &actions, action);
2275 if (ret) {
2276 ERR("Failed to add pointer to pointer array.");
2277 goto error;
2278 }
2279
2280 /* Ownership of the action was transferred to the list. */
2281 action = NULL;
2282
2283 break;
2284 }
2285 case OPT_NAME:
2286 {
2287 if (!assign_string(&name, arg, "--name")) {
2288 goto error;
2289 }
2290
2291 break;
2292 }
2293 case OPT_OWNER_UID:
2294 {
2295 if (!assign_string(&owner_uid, arg,
2296 "--owner-uid")) {
2297 goto error;
2298 }
2299
2300 break;
2301 }
2302 default:
2303 abort();
2304 }
2305 }
2306
2307 if (!condition) {
2308 ERR("Missing --condition.");
2309 goto error;
2310 }
2311
2312 if (lttng_dynamic_pointer_array_get_count(&actions) == 0) {
2313 ERR("Need at least one --action.");
2314 goto error;
2315 }
2316
2317 action_list = lttng_action_list_create();
2318 if (!action_list) {
2319 goto error;
2320 }
2321
2322 for (i = 0; i < lttng_dynamic_pointer_array_get_count(&actions); i++) {
2323 enum lttng_action_status status;
2324
2325 action = (lttng_action *) lttng_dynamic_pointer_array_steal_pointer(&actions, i);
2326
2327 status = lttng_action_list_add_action(action_list, action);
2328 if (status != LTTNG_ACTION_STATUS_OK) {
2329 goto error;
2330 }
2331
2332 /*
2333 * The `lttng_action_list_add_action()` takes a reference to
2334 * the action. We can destroy ours.
2335 */
2336 lttng_action_destroy(action);
2337 action = NULL;
2338 }
2339
2340 trigger = lttng_trigger_create(condition, action_list);
2341 if (!trigger) {
2342 goto error;
2343 }
2344
2345 if (owner_uid) {
2346 enum lttng_trigger_status trigger_status;
2347 char *end;
2348 long long uid;
2349
2350 errno = 0;
2351 uid = strtol(owner_uid, &end, 10);
2352 if (end == owner_uid || *end != '\0' || errno != 0) {
2353 ERR("Failed to parse `%s` as a user id.", owner_uid);
2354 goto error;
2355 }
2356
2357 trigger_status = lttng_trigger_set_owner_uid(trigger, uid);
2358 if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
2359 ERR("Failed to set trigger's user identity.");
2360 goto error;
2361 }
2362 }
2363
2364 if (name) {
2365 ret_code = lttng_register_trigger_with_name(trigger, name);
2366 } else {
2367 ret_code = lttng_register_trigger_with_automatic_name(trigger);
2368 }
2369
2370 if (ret_code != LTTNG_OK) {
2371 ERR("Failed to register trigger: %s.",
2372 lttng_strerror(-ret_code));
2373 goto error;
2374 }
2375
2376 if (lttng_opt_mi) {
2377 ret_code = lttng_trigger_mi_serialize(trigger, mi_writer, NULL);
2378 if (ret_code != LTTNG_OK) {
2379 goto error;
2380 }
2381 } else {
2382 const char *returned_trigger_name;
2383 const enum lttng_trigger_status trigger_status =
2384 lttng_trigger_get_name(trigger,
2385 &returned_trigger_name);
2386
2387 if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
2388 WARN("Failed to retrieve the added trigger's name.");
2389 } else {
2390 MSG("Added trigger `%s`.", returned_trigger_name);
2391 }
2392 }
2393
2394 ret = 0;
2395
2396 goto end;
2397
2398 error:
2399 ret = 1;
2400
2401 end:
2402 /* Mi closing. */
2403 if (lttng_opt_mi && mi_writer) {
2404 int mi_ret;
2405
2406 /* Close output element. */
2407 mi_ret = mi_lttng_writer_close_element(mi_writer);
2408 if (mi_ret) {
2409 ret = 1;
2410 goto cleanup;
2411 }
2412
2413 mi_ret = mi_lttng_writer_write_element_bool(mi_writer,
2414 mi_lttng_element_command_success, ret ? 0 : 1);
2415 if (mi_ret) {
2416 ret = 1;
2417 goto cleanup;
2418 }
2419
2420 /* Command element close. */
2421 mi_ret = mi_lttng_writer_command_close(mi_writer);
2422 if (mi_ret) {
2423 ret = 1;
2424 goto cleanup;
2425 }
2426 }
2427
2428 cleanup:
2429 argpar_iter_destroy(argpar_iter);
2430 argpar_item_destroy(argpar_item);
2431 lttng_dynamic_pointer_array_reset(&actions);
2432 lttng_condition_destroy(condition);
2433 lttng_action_destroy(action_list);
2434 lttng_action_destroy(action);
2435 lttng_trigger_destroy(trigger);
2436 free(name);
2437 free(owner_uid);
2438 if (mi_writer && mi_lttng_writer_destroy(mi_writer)) {
2439 /* Preserve original error code. */
2440 ret = ret ? ret : CMD_ERROR;
2441 }
2442
2443 return ret;
2444 }
LTTng 2.0 tools and control repository
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