1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
4 *
5 */
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <string.h>
9 #include <stdarg.h>
10 #include <errno.h>
11 #include <sys/types.h>
12
13 #include "event-parse.h"
14 #include "event-utils.h"
15
16 #define COMM "COMM"
17 #define CPU "CPU"
18
19 static struct format_field comm = {
20 .name = "COMM",
21 };
22
23 static struct format_field cpu = {
24 .name = "CPU",
25 };
26
27 struct event_list {
28 struct event_list *next;
29 struct event_format *event;
30 };
31
show_error(char * error_buf,const char * fmt,...)32 static void show_error(char *error_buf, const char *fmt, ...)
33 {
34 unsigned long long index;
35 const char *input;
36 va_list ap;
37 int len;
38 int i;
39
40 input = tep_get_input_buf();
41 index = tep_get_input_buf_ptr();
42 len = input ? strlen(input) : 0;
43
44 if (len) {
45 strcpy(error_buf, input);
46 error_buf[len] = '\n';
47 for (i = 1; i < len && i < index; i++)
48 error_buf[len+i] = ' ';
49 error_buf[len + i] = '^';
50 error_buf[len + i + 1] = '\n';
51 len += i+2;
52 }
53
54 va_start(ap, fmt);
55 vsnprintf(error_buf + len, TEP_FILTER_ERROR_BUFSZ - len, fmt, ap);
56 va_end(ap);
57 }
58
free_token(char * token)59 static void free_token(char *token)
60 {
61 tep_free_token(token);
62 }
63
read_token(char ** tok)64 static enum event_type read_token(char **tok)
65 {
66 enum event_type type;
67 char *token = NULL;
68
69 do {
70 free_token(token);
71 type = tep_read_token(&token);
72 } while (type == EVENT_NEWLINE || type == EVENT_SPACE);
73
74 /* If token is = or ! check to see if the next char is ~ */
75 if (token &&
76 (strcmp(token, "=") == 0 || strcmp(token, "!") == 0) &&
77 tep_peek_char() == '~') {
78 /* append it */
79 *tok = malloc(3);
80 if (*tok == NULL) {
81 free_token(token);
82 return EVENT_ERROR;
83 }
84 sprintf(*tok, "%c%c", *token, '~');
85 free_token(token);
86 /* Now remove the '~' from the buffer */
87 tep_read_token(&token);
88 free_token(token);
89 } else
90 *tok = token;
91
92 return type;
93 }
94
filter_cmp(const void * a,const void * b)95 static int filter_cmp(const void *a, const void *b)
96 {
97 const struct filter_type *ea = a;
98 const struct filter_type *eb = b;
99
100 if (ea->event_id < eb->event_id)
101 return -1;
102
103 if (ea->event_id > eb->event_id)
104 return 1;
105
106 return 0;
107 }
108
109 static struct filter_type *
find_filter_type(struct event_filter * filter,int id)110 find_filter_type(struct event_filter *filter, int id)
111 {
112 struct filter_type *filter_type;
113 struct filter_type key;
114
115 key.event_id = id;
116
117 filter_type = bsearch(&key, filter->event_filters,
118 filter->filters,
119 sizeof(*filter->event_filters),
120 filter_cmp);
121
122 return filter_type;
123 }
124
125 static struct filter_type *
add_filter_type(struct event_filter * filter,int id)126 add_filter_type(struct event_filter *filter, int id)
127 {
128 struct filter_type *filter_type;
129 int i;
130
131 filter_type = find_filter_type(filter, id);
132 if (filter_type)
133 return filter_type;
134
135 filter_type = realloc(filter->event_filters,
136 sizeof(*filter->event_filters) *
137 (filter->filters + 1));
138 if (!filter_type)
139 return NULL;
140
141 filter->event_filters = filter_type;
142
143 for (i = 0; i < filter->filters; i++) {
144 if (filter->event_filters[i].event_id > id)
145 break;
146 }
147
148 if (i < filter->filters)
149 memmove(&filter->event_filters[i+1],
150 &filter->event_filters[i],
151 sizeof(*filter->event_filters) *
152 (filter->filters - i));
153
154 filter_type = &filter->event_filters[i];
155 filter_type->event_id = id;
156 filter_type->event = tep_find_event(filter->pevent, id);
157 filter_type->filter = NULL;
158
159 filter->filters++;
160
161 return filter_type;
162 }
163
164 /**
165 * tep_filter_alloc - create a new event filter
166 * @pevent: The pevent that this filter is associated with
167 */
tep_filter_alloc(struct tep_handle * pevent)168 struct event_filter *tep_filter_alloc(struct tep_handle *pevent)
169 {
170 struct event_filter *filter;
171
172 filter = malloc(sizeof(*filter));
173 if (filter == NULL)
174 return NULL;
175
176 memset(filter, 0, sizeof(*filter));
177 filter->pevent = pevent;
178 tep_ref(pevent);
179
180 return filter;
181 }
182
allocate_arg(void)183 static struct filter_arg *allocate_arg(void)
184 {
185 return calloc(1, sizeof(struct filter_arg));
186 }
187
free_arg(struct filter_arg * arg)188 static void free_arg(struct filter_arg *arg)
189 {
190 if (!arg)
191 return;
192
193 switch (arg->type) {
194 case FILTER_ARG_NONE:
195 case FILTER_ARG_BOOLEAN:
196 break;
197
198 case FILTER_ARG_NUM:
199 free_arg(arg->num.left);
200 free_arg(arg->num.right);
201 break;
202
203 case FILTER_ARG_EXP:
204 free_arg(arg->exp.left);
205 free_arg(arg->exp.right);
206 break;
207
208 case FILTER_ARG_STR:
209 free(arg->str.val);
210 regfree(&arg->str.reg);
211 free(arg->str.buffer);
212 break;
213
214 case FILTER_ARG_VALUE:
215 if (arg->value.type == FILTER_STRING ||
216 arg->value.type == FILTER_CHAR)
217 free(arg->value.str);
218 break;
219
220 case FILTER_ARG_OP:
221 free_arg(arg->op.left);
222 free_arg(arg->op.right);
223 default:
224 break;
225 }
226
227 free(arg);
228 }
229
add_event(struct event_list ** events,struct event_format * event)230 static int add_event(struct event_list **events,
231 struct event_format *event)
232 {
233 struct event_list *list;
234
235 list = malloc(sizeof(*list));
236 if (list == NULL)
237 return -1;
238
239 list->next = *events;
240 *events = list;
241 list->event = event;
242 return 0;
243 }
244
event_match(struct event_format * event,regex_t * sreg,regex_t * ereg)245 static int event_match(struct event_format *event,
246 regex_t *sreg, regex_t *ereg)
247 {
248 if (sreg) {
249 return !regexec(sreg, event->system, 0, NULL, 0) &&
250 !regexec(ereg, event->name, 0, NULL, 0);
251 }
252
253 return !regexec(ereg, event->system, 0, NULL, 0) ||
254 !regexec(ereg, event->name, 0, NULL, 0);
255 }
256
257 static enum tep_errno
find_event(struct tep_handle * pevent,struct event_list ** events,char * sys_name,char * event_name)258 find_event(struct tep_handle *pevent, struct event_list **events,
259 char *sys_name, char *event_name)
260 {
261 struct event_format *event;
262 regex_t ereg;
263 regex_t sreg;
264 int match = 0;
265 int fail = 0;
266 char *reg;
267 int ret;
268 int i;
269
270 if (!event_name) {
271 /* if no name is given, then swap sys and name */
272 event_name = sys_name;
273 sys_name = NULL;
274 }
275
276 ret = asprintf(®, "^%s$", event_name);
277 if (ret < 0)
278 return TEP_ERRNO__MEM_ALLOC_FAILED;
279
280 ret = regcomp(&ereg, reg, REG_ICASE|REG_NOSUB);
281 free(reg);
282
283 if (ret)
284 return TEP_ERRNO__INVALID_EVENT_NAME;
285
286 if (sys_name) {
287 ret = asprintf(®, "^%s$", sys_name);
288 if (ret < 0) {
289 regfree(&ereg);
290 return TEP_ERRNO__MEM_ALLOC_FAILED;
291 }
292
293 ret = regcomp(&sreg, reg, REG_ICASE|REG_NOSUB);
294 free(reg);
295 if (ret) {
296 regfree(&ereg);
297 return TEP_ERRNO__INVALID_EVENT_NAME;
298 }
299 }
300
301 for (i = 0; i < pevent->nr_events; i++) {
302 event = pevent->events[i];
303 if (event_match(event, sys_name ? &sreg : NULL, &ereg)) {
304 match = 1;
305 if (add_event(events, event) < 0) {
306 fail = 1;
307 break;
308 }
309 }
310 }
311
312 regfree(&ereg);
313 if (sys_name)
314 regfree(&sreg);
315
316 if (!match)
317 return TEP_ERRNO__EVENT_NOT_FOUND;
318 if (fail)
319 return TEP_ERRNO__MEM_ALLOC_FAILED;
320
321 return 0;
322 }
323
free_events(struct event_list * events)324 static void free_events(struct event_list *events)
325 {
326 struct event_list *event;
327
328 while (events) {
329 event = events;
330 events = events->next;
331 free(event);
332 }
333 }
334
335 static enum tep_errno
create_arg_item(struct event_format * event,const char * token,enum event_type type,struct filter_arg ** parg,char * error_str)336 create_arg_item(struct event_format *event, const char *token,
337 enum event_type type, struct filter_arg **parg, char *error_str)
338 {
339 struct format_field *field;
340 struct filter_arg *arg;
341
342 arg = allocate_arg();
343 if (arg == NULL) {
344 show_error(error_str, "failed to allocate filter arg");
345 return TEP_ERRNO__MEM_ALLOC_FAILED;
346 }
347
348 switch (type) {
349
350 case EVENT_SQUOTE:
351 case EVENT_DQUOTE:
352 arg->type = FILTER_ARG_VALUE;
353 arg->value.type =
354 type == EVENT_DQUOTE ? FILTER_STRING : FILTER_CHAR;
355 arg->value.str = strdup(token);
356 if (!arg->value.str) {
357 free_arg(arg);
358 show_error(error_str, "failed to allocate string filter arg");
359 return TEP_ERRNO__MEM_ALLOC_FAILED;
360 }
361 break;
362 case EVENT_ITEM:
363 /* if it is a number, then convert it */
364 if (isdigit(token[0])) {
365 arg->type = FILTER_ARG_VALUE;
366 arg->value.type = FILTER_NUMBER;
367 arg->value.val = strtoull(token, NULL, 0);
368 break;
369 }
370 /* Consider this a field */
371 field = tep_find_any_field(event, token);
372 if (!field) {
373 /* If token is 'COMM' or 'CPU' then it is special */
374 if (strcmp(token, COMM) == 0) {
375 field = &comm;
376 } else if (strcmp(token, CPU) == 0) {
377 field = &cpu;
378 } else {
379 /* not a field, Make it false */
380 arg->type = FILTER_ARG_BOOLEAN;
381 arg->boolean.value = FILTER_FALSE;
382 break;
383 }
384 }
385 arg->type = FILTER_ARG_FIELD;
386 arg->field.field = field;
387 break;
388 default:
389 free_arg(arg);
390 show_error(error_str, "expected a value but found %s", token);
391 return TEP_ERRNO__UNEXPECTED_TYPE;
392 }
393 *parg = arg;
394 return 0;
395 }
396
397 static struct filter_arg *
create_arg_op(enum filter_op_type btype)398 create_arg_op(enum filter_op_type btype)
399 {
400 struct filter_arg *arg;
401
402 arg = allocate_arg();
403 if (!arg)
404 return NULL;
405
406 arg->type = FILTER_ARG_OP;
407 arg->op.type = btype;
408
409 return arg;
410 }
411
412 static struct filter_arg *
create_arg_exp(enum filter_exp_type etype)413 create_arg_exp(enum filter_exp_type etype)
414 {
415 struct filter_arg *arg;
416
417 arg = allocate_arg();
418 if (!arg)
419 return NULL;
420
421 arg->type = FILTER_ARG_EXP;
422 arg->exp.type = etype;
423
424 return arg;
425 }
426
427 static struct filter_arg *
create_arg_cmp(enum filter_cmp_type ctype)428 create_arg_cmp(enum filter_cmp_type ctype)
429 {
430 struct filter_arg *arg;
431
432 arg = allocate_arg();
433 if (!arg)
434 return NULL;
435
436 /* Use NUM and change if necessary */
437 arg->type = FILTER_ARG_NUM;
438 arg->num.type = ctype;
439
440 return arg;
441 }
442
443 static enum tep_errno
add_right(struct filter_arg * op,struct filter_arg * arg,char * error_str)444 add_right(struct filter_arg *op, struct filter_arg *arg, char *error_str)
445 {
446 struct filter_arg *left;
447 char *str;
448 int op_type;
449 int ret;
450
451 switch (op->type) {
452 case FILTER_ARG_EXP:
453 if (op->exp.right)
454 goto out_fail;
455 op->exp.right = arg;
456 break;
457
458 case FILTER_ARG_OP:
459 if (op->op.right)
460 goto out_fail;
461 op->op.right = arg;
462 break;
463
464 case FILTER_ARG_NUM:
465 if (op->op.right)
466 goto out_fail;
467 /*
468 * The arg must be num, str, or field
469 */
470 switch (arg->type) {
471 case FILTER_ARG_VALUE:
472 case FILTER_ARG_FIELD:
473 break;
474 default:
475 show_error(error_str, "Illegal rvalue");
476 return TEP_ERRNO__ILLEGAL_RVALUE;
477 }
478
479 /*
480 * Depending on the type, we may need to
481 * convert this to a string or regex.
482 */
483 switch (arg->value.type) {
484 case FILTER_CHAR:
485 /*
486 * A char should be converted to number if
487 * the string is 1 byte, and the compare
488 * is not a REGEX.
489 */
490 if (strlen(arg->value.str) == 1 &&
491 op->num.type != FILTER_CMP_REGEX &&
492 op->num.type != FILTER_CMP_NOT_REGEX) {
493 arg->value.type = FILTER_NUMBER;
494 goto do_int;
495 }
496 /* fall through */
497 case FILTER_STRING:
498
499 /* convert op to a string arg */
500 op_type = op->num.type;
501 left = op->num.left;
502 str = arg->value.str;
503
504 /* reset the op for the new field */
505 memset(op, 0, sizeof(*op));
506
507 /*
508 * If left arg was a field not found then
509 * NULL the entire op.
510 */
511 if (left->type == FILTER_ARG_BOOLEAN) {
512 free_arg(left);
513 free_arg(arg);
514 op->type = FILTER_ARG_BOOLEAN;
515 op->boolean.value = FILTER_FALSE;
516 break;
517 }
518
519 /* Left arg must be a field */
520 if (left->type != FILTER_ARG_FIELD) {
521 show_error(error_str,
522 "Illegal lvalue for string comparison");
523 return TEP_ERRNO__ILLEGAL_LVALUE;
524 }
525
526 /* Make sure this is a valid string compare */
527 switch (op_type) {
528 case FILTER_CMP_EQ:
529 op_type = FILTER_CMP_MATCH;
530 break;
531 case FILTER_CMP_NE:
532 op_type = FILTER_CMP_NOT_MATCH;
533 break;
534
535 case FILTER_CMP_REGEX:
536 case FILTER_CMP_NOT_REGEX:
537 ret = regcomp(&op->str.reg, str, REG_ICASE|REG_NOSUB);
538 if (ret) {
539 show_error(error_str,
540 "RegEx '%s' did not compute",
541 str);
542 return TEP_ERRNO__INVALID_REGEX;
543 }
544 break;
545 default:
546 show_error(error_str,
547 "Illegal comparison for string");
548 return TEP_ERRNO__ILLEGAL_STRING_CMP;
549 }
550
551 op->type = FILTER_ARG_STR;
552 op->str.type = op_type;
553 op->str.field = left->field.field;
554 op->str.val = strdup(str);
555 if (!op->str.val) {
556 show_error(error_str, "Failed to allocate string filter");
557 return TEP_ERRNO__MEM_ALLOC_FAILED;
558 }
559 /*
560 * Need a buffer to copy data for tests
561 */
562 op->str.buffer = malloc(op->str.field->size + 1);
563 if (!op->str.buffer) {
564 show_error(error_str, "Failed to allocate string filter");
565 return TEP_ERRNO__MEM_ALLOC_FAILED;
566 }
567 /* Null terminate this buffer */
568 op->str.buffer[op->str.field->size] = 0;
569
570 /* We no longer have left or right args */
571 free_arg(arg);
572 free_arg(left);
573
574 break;
575
576 case FILTER_NUMBER:
577
578 do_int:
579 switch (op->num.type) {
580 case FILTER_CMP_REGEX:
581 case FILTER_CMP_NOT_REGEX:
582 show_error(error_str,
583 "Op not allowed with integers");
584 return TEP_ERRNO__ILLEGAL_INTEGER_CMP;
585
586 default:
587 break;
588 }
589
590 /* numeric compare */
591 op->num.right = arg;
592 break;
593 default:
594 goto out_fail;
595 }
596 break;
597 default:
598 goto out_fail;
599 }
600
601 return 0;
602
603 out_fail:
604 show_error(error_str, "Syntax error");
605 return TEP_ERRNO__SYNTAX_ERROR;
606 }
607
608 static struct filter_arg *
rotate_op_right(struct filter_arg * a,struct filter_arg * b)609 rotate_op_right(struct filter_arg *a, struct filter_arg *b)
610 {
611 struct filter_arg *arg;
612
613 arg = a->op.right;
614 a->op.right = b;
615 return arg;
616 }
617
add_left(struct filter_arg * op,struct filter_arg * arg)618 static enum tep_errno add_left(struct filter_arg *op, struct filter_arg *arg)
619 {
620 switch (op->type) {
621 case FILTER_ARG_EXP:
622 if (arg->type == FILTER_ARG_OP)
623 arg = rotate_op_right(arg, op);
624 op->exp.left = arg;
625 break;
626
627 case FILTER_ARG_OP:
628 op->op.left = arg;
629 break;
630 case FILTER_ARG_NUM:
631 if (arg->type == FILTER_ARG_OP)
632 arg = rotate_op_right(arg, op);
633
634 /* left arg of compares must be a field */
635 if (arg->type != FILTER_ARG_FIELD &&
636 arg->type != FILTER_ARG_BOOLEAN)
637 return TEP_ERRNO__INVALID_ARG_TYPE;
638 op->num.left = arg;
639 break;
640 default:
641 return TEP_ERRNO__INVALID_ARG_TYPE;
642 }
643 return 0;
644 }
645
646 enum op_type {
647 OP_NONE,
648 OP_BOOL,
649 OP_NOT,
650 OP_EXP,
651 OP_CMP,
652 };
653
process_op(const char * token,enum filter_op_type * btype,enum filter_cmp_type * ctype,enum filter_exp_type * etype)654 static enum op_type process_op(const char *token,
655 enum filter_op_type *btype,
656 enum filter_cmp_type *ctype,
657 enum filter_exp_type *etype)
658 {
659 *btype = FILTER_OP_NOT;
660 *etype = FILTER_EXP_NONE;
661 *ctype = FILTER_CMP_NONE;
662
663 if (strcmp(token, "&&") == 0)
664 *btype = FILTER_OP_AND;
665 else if (strcmp(token, "||") == 0)
666 *btype = FILTER_OP_OR;
667 else if (strcmp(token, "!") == 0)
668 return OP_NOT;
669
670 if (*btype != FILTER_OP_NOT)
671 return OP_BOOL;
672
673 /* Check for value expressions */
674 if (strcmp(token, "+") == 0) {
675 *etype = FILTER_EXP_ADD;
676 } else if (strcmp(token, "-") == 0) {
677 *etype = FILTER_EXP_SUB;
678 } else if (strcmp(token, "*") == 0) {
679 *etype = FILTER_EXP_MUL;
680 } else if (strcmp(token, "/") == 0) {
681 *etype = FILTER_EXP_DIV;
682 } else if (strcmp(token, "%") == 0) {
683 *etype = FILTER_EXP_MOD;
684 } else if (strcmp(token, ">>") == 0) {
685 *etype = FILTER_EXP_RSHIFT;
686 } else if (strcmp(token, "<<") == 0) {
687 *etype = FILTER_EXP_LSHIFT;
688 } else if (strcmp(token, "&") == 0) {
689 *etype = FILTER_EXP_AND;
690 } else if (strcmp(token, "|") == 0) {
691 *etype = FILTER_EXP_OR;
692 } else if (strcmp(token, "^") == 0) {
693 *etype = FILTER_EXP_XOR;
694 } else if (strcmp(token, "~") == 0)
695 *etype = FILTER_EXP_NOT;
696
697 if (*etype != FILTER_EXP_NONE)
698 return OP_EXP;
699
700 /* Check for compares */
701 if (strcmp(token, "==") == 0)
702 *ctype = FILTER_CMP_EQ;
703 else if (strcmp(token, "!=") == 0)
704 *ctype = FILTER_CMP_NE;
705 else if (strcmp(token, "<") == 0)
706 *ctype = FILTER_CMP_LT;
707 else if (strcmp(token, ">") == 0)
708 *ctype = FILTER_CMP_GT;
709 else if (strcmp(token, "<=") == 0)
710 *ctype = FILTER_CMP_LE;
711 else if (strcmp(token, ">=") == 0)
712 *ctype = FILTER_CMP_GE;
713 else if (strcmp(token, "=~") == 0)
714 *ctype = FILTER_CMP_REGEX;
715 else if (strcmp(token, "!~") == 0)
716 *ctype = FILTER_CMP_NOT_REGEX;
717 else
718 return OP_NONE;
719
720 return OP_CMP;
721 }
722
check_op_done(struct filter_arg * arg)723 static int check_op_done(struct filter_arg *arg)
724 {
725 switch (arg->type) {
726 case FILTER_ARG_EXP:
727 return arg->exp.right != NULL;
728
729 case FILTER_ARG_OP:
730 return arg->op.right != NULL;
731
732 case FILTER_ARG_NUM:
733 return arg->num.right != NULL;
734
735 case FILTER_ARG_STR:
736 /* A string conversion is always done */
737 return 1;
738
739 case FILTER_ARG_BOOLEAN:
740 /* field not found, is ok */
741 return 1;
742
743 default:
744 return 0;
745 }
746 }
747
748 enum filter_vals {
749 FILTER_VAL_NORM,
750 FILTER_VAL_FALSE,
751 FILTER_VAL_TRUE,
752 };
753
754 static enum tep_errno
reparent_op_arg(struct filter_arg * parent,struct filter_arg * old_child,struct filter_arg * arg,char * error_str)755 reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
756 struct filter_arg *arg, char *error_str)
757 {
758 struct filter_arg *other_child;
759 struct filter_arg **ptr;
760
761 if (parent->type != FILTER_ARG_OP &&
762 arg->type != FILTER_ARG_OP) {
763 show_error(error_str, "can not reparent other than OP");
764 return TEP_ERRNO__REPARENT_NOT_OP;
765 }
766
767 /* Get the sibling */
768 if (old_child->op.right == arg) {
769 ptr = &old_child->op.right;
770 other_child = old_child->op.left;
771 } else if (old_child->op.left == arg) {
772 ptr = &old_child->op.left;
773 other_child = old_child->op.right;
774 } else {
775 show_error(error_str, "Error in reparent op, find other child");
776 return TEP_ERRNO__REPARENT_FAILED;
777 }
778
779 /* Detach arg from old_child */
780 *ptr = NULL;
781
782 /* Check for root */
783 if (parent == old_child) {
784 free_arg(other_child);
785 *parent = *arg;
786 /* Free arg without recussion */
787 free(arg);
788 return 0;
789 }
790
791 if (parent->op.right == old_child)
792 ptr = &parent->op.right;
793 else if (parent->op.left == old_child)
794 ptr = &parent->op.left;
795 else {
796 show_error(error_str, "Error in reparent op");
797 return TEP_ERRNO__REPARENT_FAILED;
798 }
799
800 *ptr = arg;
801
802 free_arg(old_child);
803 return 0;
804 }
805
806 /* Returns either filter_vals (success) or tep_errno (failfure) */
test_arg(struct filter_arg * parent,struct filter_arg * arg,char * error_str)807 static int test_arg(struct filter_arg *parent, struct filter_arg *arg,
808 char *error_str)
809 {
810 int lval, rval;
811
812 switch (arg->type) {
813
814 /* bad case */
815 case FILTER_ARG_BOOLEAN:
816 return FILTER_VAL_FALSE + arg->boolean.value;
817
818 /* good cases: */
819 case FILTER_ARG_STR:
820 case FILTER_ARG_VALUE:
821 case FILTER_ARG_FIELD:
822 return FILTER_VAL_NORM;
823
824 case FILTER_ARG_EXP:
825 lval = test_arg(arg, arg->exp.left, error_str);
826 if (lval != FILTER_VAL_NORM)
827 return lval;
828 rval = test_arg(arg, arg->exp.right, error_str);
829 if (rval != FILTER_VAL_NORM)
830 return rval;
831 return FILTER_VAL_NORM;
832
833 case FILTER_ARG_NUM:
834 lval = test_arg(arg, arg->num.left, error_str);
835 if (lval != FILTER_VAL_NORM)
836 return lval;
837 rval = test_arg(arg, arg->num.right, error_str);
838 if (rval != FILTER_VAL_NORM)
839 return rval;
840 return FILTER_VAL_NORM;
841
842 case FILTER_ARG_OP:
843 if (arg->op.type != FILTER_OP_NOT) {
844 lval = test_arg(arg, arg->op.left, error_str);
845 switch (lval) {
846 case FILTER_VAL_NORM:
847 break;
848 case FILTER_VAL_TRUE:
849 if (arg->op.type == FILTER_OP_OR)
850 return FILTER_VAL_TRUE;
851 rval = test_arg(arg, arg->op.right, error_str);
852 if (rval != FILTER_VAL_NORM)
853 return rval;
854
855 return reparent_op_arg(parent, arg, arg->op.right,
856 error_str);
857
858 case FILTER_VAL_FALSE:
859 if (arg->op.type == FILTER_OP_AND)
860 return FILTER_VAL_FALSE;
861 rval = test_arg(arg, arg->op.right, error_str);
862 if (rval != FILTER_VAL_NORM)
863 return rval;
864
865 return reparent_op_arg(parent, arg, arg->op.right,
866 error_str);
867
868 default:
869 return lval;
870 }
871 }
872
873 rval = test_arg(arg, arg->op.right, error_str);
874 switch (rval) {
875 case FILTER_VAL_NORM:
876 default:
877 break;
878
879 case FILTER_VAL_TRUE:
880 if (arg->op.type == FILTER_OP_OR)
881 return FILTER_VAL_TRUE;
882 if (arg->op.type == FILTER_OP_NOT)
883 return FILTER_VAL_FALSE;
884
885 return reparent_op_arg(parent, arg, arg->op.left,
886 error_str);
887
888 case FILTER_VAL_FALSE:
889 if (arg->op.type == FILTER_OP_AND)
890 return FILTER_VAL_FALSE;
891 if (arg->op.type == FILTER_OP_NOT)
892 return FILTER_VAL_TRUE;
893
894 return reparent_op_arg(parent, arg, arg->op.left,
895 error_str);
896 }
897
898 return rval;
899 default:
900 show_error(error_str, "bad arg in filter tree");
901 return TEP_ERRNO__BAD_FILTER_ARG;
902 }
903 return FILTER_VAL_NORM;
904 }
905
906 /* Remove any unknown event fields */
collapse_tree(struct filter_arg * arg,struct filter_arg ** arg_collapsed,char * error_str)907 static int collapse_tree(struct filter_arg *arg,
908 struct filter_arg **arg_collapsed, char *error_str)
909 {
910 int ret;
911
912 ret = test_arg(arg, arg, error_str);
913 switch (ret) {
914 case FILTER_VAL_NORM:
915 break;
916
917 case FILTER_VAL_TRUE:
918 case FILTER_VAL_FALSE:
919 free_arg(arg);
920 arg = allocate_arg();
921 if (arg) {
922 arg->type = FILTER_ARG_BOOLEAN;
923 arg->boolean.value = ret == FILTER_VAL_TRUE;
924 } else {
925 show_error(error_str, "Failed to allocate filter arg");
926 ret = TEP_ERRNO__MEM_ALLOC_FAILED;
927 }
928 break;
929
930 default:
931 /* test_arg() already set the error_str */
932 free_arg(arg);
933 arg = NULL;
934 break;
935 }
936
937 *arg_collapsed = arg;
938 return ret;
939 }
940
941 static enum tep_errno
process_filter(struct event_format * event,struct filter_arg ** parg,char * error_str,int not)942 process_filter(struct event_format *event, struct filter_arg **parg,
943 char *error_str, int not)
944 {
945 enum event_type type;
946 char *token = NULL;
947 struct filter_arg *current_op = NULL;
948 struct filter_arg *current_exp = NULL;
949 struct filter_arg *left_item = NULL;
950 struct filter_arg *arg = NULL;
951 enum op_type op_type;
952 enum filter_op_type btype;
953 enum filter_exp_type etype;
954 enum filter_cmp_type ctype;
955 enum tep_errno ret;
956
957 *parg = NULL;
958
959 do {
960 free(token);
961 type = read_token(&token);
962 switch (type) {
963 case EVENT_SQUOTE:
964 case EVENT_DQUOTE:
965 case EVENT_ITEM:
966 ret = create_arg_item(event, token, type, &arg, error_str);
967 if (ret < 0)
968 goto fail;
969 if (!left_item)
970 left_item = arg;
971 else if (current_exp) {
972 ret = add_right(current_exp, arg, error_str);
973 if (ret < 0)
974 goto fail;
975 left_item = NULL;
976 /* Not's only one one expression */
977 if (not) {
978 arg = NULL;
979 if (current_op)
980 goto fail_syntax;
981 free(token);
982 *parg = current_exp;
983 return 0;
984 }
985 } else
986 goto fail_syntax;
987 arg = NULL;
988 break;
989
990 case EVENT_DELIM:
991 if (*token == ',') {
992 show_error(error_str, "Illegal token ','");
993 ret = TEP_ERRNO__ILLEGAL_TOKEN;
994 goto fail;
995 }
996
997 if (*token == '(') {
998 if (left_item) {
999 show_error(error_str,
1000 "Open paren can not come after item");
1001 ret = TEP_ERRNO__INVALID_PAREN;
1002 goto fail;
1003 }
1004 if (current_exp) {
1005 show_error(error_str,
1006 "Open paren can not come after expression");
1007 ret = TEP_ERRNO__INVALID_PAREN;
1008 goto fail;
1009 }
1010
1011 ret = process_filter(event, &arg, error_str, 0);
1012 if (ret != TEP_ERRNO__UNBALANCED_PAREN) {
1013 if (ret == 0) {
1014 show_error(error_str,
1015 "Unbalanced number of '('");
1016 ret = TEP_ERRNO__UNBALANCED_PAREN;
1017 }
1018 goto fail;
1019 }
1020 ret = 0;
1021
1022 /* A not wants just one expression */
1023 if (not) {
1024 if (current_op)
1025 goto fail_syntax;
1026 *parg = arg;
1027 return 0;
1028 }
1029
1030 if (current_op)
1031 ret = add_right(current_op, arg, error_str);
1032 else
1033 current_exp = arg;
1034
1035 if (ret < 0)
1036 goto fail;
1037
1038 } else { /* ')' */
1039 if (!current_op && !current_exp)
1040 goto fail_syntax;
1041
1042 /* Make sure everything is finished at this level */
1043 if (current_exp && !check_op_done(current_exp))
1044 goto fail_syntax;
1045 if (current_op && !check_op_done(current_op))
1046 goto fail_syntax;
1047
1048 if (current_op)
1049 *parg = current_op;
1050 else
1051 *parg = current_exp;
1052 free(token);
1053 return TEP_ERRNO__UNBALANCED_PAREN;
1054 }
1055 break;
1056
1057 case EVENT_OP:
1058 op_type = process_op(token, &btype, &ctype, &etype);
1059
1060 /* All expect a left arg except for NOT */
1061 switch (op_type) {
1062 case OP_BOOL:
1063 /* Logic ops need a left expression */
1064 if (!current_exp && !current_op)
1065 goto fail_syntax;
1066 /* fall through */
1067 case OP_NOT:
1068 /* logic only processes ops and exp */
1069 if (left_item)
1070 goto fail_syntax;
1071 break;
1072 case OP_EXP:
1073 case OP_CMP:
1074 if (!left_item)
1075 goto fail_syntax;
1076 break;
1077 case OP_NONE:
1078 show_error(error_str,
1079 "Unknown op token %s", token);
1080 ret = TEP_ERRNO__UNKNOWN_TOKEN;
1081 goto fail;
1082 }
1083
1084 ret = 0;
1085 switch (op_type) {
1086 case OP_BOOL:
1087 arg = create_arg_op(btype);
1088 if (arg == NULL)
1089 goto fail_alloc;
1090 if (current_op)
1091 ret = add_left(arg, current_op);
1092 else
1093 ret = add_left(arg, current_exp);
1094 current_op = arg;
1095 current_exp = NULL;
1096 break;
1097
1098 case OP_NOT:
1099 arg = create_arg_op(btype);
1100 if (arg == NULL)
1101 goto fail_alloc;
1102 if (current_op)
1103 ret = add_right(current_op, arg, error_str);
1104 if (ret < 0)
1105 goto fail;
1106 current_exp = arg;
1107 ret = process_filter(event, &arg, error_str, 1);
1108 if (ret < 0)
1109 goto fail;
1110 ret = add_right(current_exp, arg, error_str);
1111 if (ret < 0)
1112 goto fail;
1113 break;
1114
1115 case OP_EXP:
1116 case OP_CMP:
1117 if (op_type == OP_EXP)
1118 arg = create_arg_exp(etype);
1119 else
1120 arg = create_arg_cmp(ctype);
1121 if (arg == NULL)
1122 goto fail_alloc;
1123
1124 if (current_op)
1125 ret = add_right(current_op, arg, error_str);
1126 if (ret < 0)
1127 goto fail;
1128 ret = add_left(arg, left_item);
1129 if (ret < 0) {
1130 arg = NULL;
1131 goto fail_syntax;
1132 }
1133 current_exp = arg;
1134 break;
1135 default:
1136 break;
1137 }
1138 arg = NULL;
1139 if (ret < 0)
1140 goto fail_syntax;
1141 break;
1142 case EVENT_NONE:
1143 break;
1144 case EVENT_ERROR:
1145 goto fail_alloc;
1146 default:
1147 goto fail_syntax;
1148 }
1149 } while (type != EVENT_NONE);
1150
1151 if (!current_op && !current_exp)
1152 goto fail_syntax;
1153
1154 if (!current_op)
1155 current_op = current_exp;
1156
1157 ret = collapse_tree(current_op, parg, error_str);
1158 /* collapse_tree() may free current_op, and updates parg accordingly */
1159 current_op = NULL;
1160 if (ret < 0)
1161 goto fail;
1162
1163 free(token);
1164 return 0;
1165
1166 fail_alloc:
1167 show_error(error_str, "failed to allocate filter arg");
1168 ret = TEP_ERRNO__MEM_ALLOC_FAILED;
1169 goto fail;
1170 fail_syntax:
1171 show_error(error_str, "Syntax error");
1172 ret = TEP_ERRNO__SYNTAX_ERROR;
1173 fail:
1174 free_arg(current_op);
1175 free_arg(current_exp);
1176 free_arg(arg);
1177 free(token);
1178 return ret;
1179 }
1180
1181 static enum tep_errno
process_event(struct event_format * event,const char * filter_str,struct filter_arg ** parg,char * error_str)1182 process_event(struct event_format *event, const char *filter_str,
1183 struct filter_arg **parg, char *error_str)
1184 {
1185 int ret;
1186
1187 tep_buffer_init(filter_str, strlen(filter_str));
1188
1189 ret = process_filter(event, parg, error_str, 0);
1190 if (ret < 0)
1191 return ret;
1192
1193 /* If parg is NULL, then make it into FALSE */
1194 if (!*parg) {
1195 *parg = allocate_arg();
1196 if (*parg == NULL)
1197 return TEP_ERRNO__MEM_ALLOC_FAILED;
1198
1199 (*parg)->type = FILTER_ARG_BOOLEAN;
1200 (*parg)->boolean.value = FILTER_FALSE;
1201 }
1202
1203 return 0;
1204 }
1205
1206 static enum tep_errno
filter_event(struct event_filter * filter,struct event_format * event,const char * filter_str,char * error_str)1207 filter_event(struct event_filter *filter, struct event_format *event,
1208 const char *filter_str, char *error_str)
1209 {
1210 struct filter_type *filter_type;
1211 struct filter_arg *arg;
1212 enum tep_errno ret;
1213
1214 if (filter_str) {
1215 ret = process_event(event, filter_str, &arg, error_str);
1216 if (ret < 0)
1217 return ret;
1218
1219 } else {
1220 /* just add a TRUE arg */
1221 arg = allocate_arg();
1222 if (arg == NULL)
1223 return TEP_ERRNO__MEM_ALLOC_FAILED;
1224
1225 arg->type = FILTER_ARG_BOOLEAN;
1226 arg->boolean.value = FILTER_TRUE;
1227 }
1228
1229 filter_type = add_filter_type(filter, event->id);
1230 if (filter_type == NULL) {
1231 free_arg(arg);
1232 return TEP_ERRNO__MEM_ALLOC_FAILED;
1233 }
1234
1235 if (filter_type->filter)
1236 free_arg(filter_type->filter);
1237 filter_type->filter = arg;
1238
1239 return 0;
1240 }
1241
filter_init_error_buf(struct event_filter * filter)1242 static void filter_init_error_buf(struct event_filter *filter)
1243 {
1244 /* clear buffer to reset show error */
1245 tep_buffer_init("", 0);
1246 filter->error_buffer[0] = '\0';
1247 }
1248
1249 /**
1250 * tep_filter_add_filter_str - add a new filter
1251 * @filter: the event filter to add to
1252 * @filter_str: the filter string that contains the filter
1253 *
1254 * Returns 0 if the filter was successfully added or a
1255 * negative error code. Use tep_filter_strerror() to see
1256 * actual error message in case of error.
1257 */
tep_filter_add_filter_str(struct event_filter * filter,const char * filter_str)1258 enum tep_errno tep_filter_add_filter_str(struct event_filter *filter,
1259 const char *filter_str)
1260 {
1261 struct tep_handle *pevent = filter->pevent;
1262 struct event_list *event;
1263 struct event_list *events = NULL;
1264 const char *filter_start;
1265 const char *next_event;
1266 char *this_event;
1267 char *event_name = NULL;
1268 char *sys_name = NULL;
1269 char *sp;
1270 enum tep_errno rtn = 0; /* TEP_ERRNO__SUCCESS */
1271 int len;
1272 int ret;
1273
1274 filter_init_error_buf(filter);
1275
1276 filter_start = strchr(filter_str, ':');
1277 if (filter_start)
1278 len = filter_start - filter_str;
1279 else
1280 len = strlen(filter_str);
1281
1282 do {
1283 next_event = strchr(filter_str, ',');
1284 if (next_event &&
1285 (!filter_start || next_event < filter_start))
1286 len = next_event - filter_str;
1287 else if (filter_start)
1288 len = filter_start - filter_str;
1289 else
1290 len = strlen(filter_str);
1291
1292 this_event = malloc(len + 1);
1293 if (this_event == NULL) {
1294 /* This can only happen when events is NULL, but still */
1295 free_events(events);
1296 return TEP_ERRNO__MEM_ALLOC_FAILED;
1297 }
1298 memcpy(this_event, filter_str, len);
1299 this_event[len] = 0;
1300
1301 if (next_event)
1302 next_event++;
1303
1304 filter_str = next_event;
1305
1306 sys_name = strtok_r(this_event, "/", &sp);
1307 event_name = strtok_r(NULL, "/", &sp);
1308
1309 if (!sys_name) {
1310 /* This can only happen when events is NULL, but still */
1311 free_events(events);
1312 free(this_event);
1313 return TEP_ERRNO__FILTER_NOT_FOUND;
1314 }
1315
1316 /* Find this event */
1317 ret = find_event(pevent, &events, strim(sys_name), strim(event_name));
1318 if (ret < 0) {
1319 free_events(events);
1320 free(this_event);
1321 return ret;
1322 }
1323 free(this_event);
1324 } while (filter_str);
1325
1326 /* Skip the ':' */
1327 if (filter_start)
1328 filter_start++;
1329
1330 /* filter starts here */
1331 for (event = events; event; event = event->next) {
1332 ret = filter_event(filter, event->event, filter_start,
1333 filter->error_buffer);
1334 /* Failures are returned if a parse error happened */
1335 if (ret < 0)
1336 rtn = ret;
1337
1338 if (ret >= 0 && pevent->test_filters) {
1339 char *test;
1340 test = tep_filter_make_string(filter, event->event->id);
1341 if (test) {
1342 printf(" '%s: %s'\n", event->event->name, test);
1343 free(test);
1344 }
1345 }
1346 }
1347
1348 free_events(events);
1349
1350 if (rtn >= 0 && pevent->test_filters)
1351 exit(0);
1352
1353 return rtn;
1354 }
1355
free_filter_type(struct filter_type * filter_type)1356 static void free_filter_type(struct filter_type *filter_type)
1357 {
1358 free_arg(filter_type->filter);
1359 }
1360
1361 /**
1362 * tep_filter_strerror - fill error message in a buffer
1363 * @filter: the event filter contains error
1364 * @err: the error code
1365 * @buf: the buffer to be filled in
1366 * @buflen: the size of the buffer
1367 *
1368 * Returns 0 if message was filled successfully, -1 if error
1369 */
tep_filter_strerror(struct event_filter * filter,enum tep_errno err,char * buf,size_t buflen)1370 int tep_filter_strerror(struct event_filter *filter, enum tep_errno err,
1371 char *buf, size_t buflen)
1372 {
1373 if (err <= __TEP_ERRNO__START || err >= __TEP_ERRNO__END)
1374 return -1;
1375
1376 if (strlen(filter->error_buffer) > 0) {
1377 size_t len = snprintf(buf, buflen, "%s", filter->error_buffer);
1378
1379 if (len > buflen)
1380 return -1;
1381 return 0;
1382 }
1383
1384 return tep_strerror(filter->pevent, err, buf, buflen);
1385 }
1386
1387 /**
1388 * tep_filter_remove_event - remove a filter for an event
1389 * @filter: the event filter to remove from
1390 * @event_id: the event to remove a filter for
1391 *
1392 * Removes the filter saved for an event defined by @event_id
1393 * from the @filter.
1394 *
1395 * Returns 1: if an event was removed
1396 * 0: if the event was not found
1397 */
tep_filter_remove_event(struct event_filter * filter,int event_id)1398 int tep_filter_remove_event(struct event_filter *filter,
1399 int event_id)
1400 {
1401 struct filter_type *filter_type;
1402 unsigned long len;
1403
1404 if (!filter->filters)
1405 return 0;
1406
1407 filter_type = find_filter_type(filter, event_id);
1408
1409 if (!filter_type)
1410 return 0;
1411
1412 free_filter_type(filter_type);
1413
1414 /* The filter_type points into the event_filters array */
1415 len = (unsigned long)(filter->event_filters + filter->filters) -
1416 (unsigned long)(filter_type + 1);
1417
1418 memmove(filter_type, filter_type + 1, len);
1419 filter->filters--;
1420
1421 memset(&filter->event_filters[filter->filters], 0,
1422 sizeof(*filter_type));
1423
1424 return 1;
1425 }
1426
1427 /**
1428 * tep_filter_reset - clear all filters in a filter
1429 * @filter: the event filter to reset
1430 *
1431 * Removes all filters from a filter and resets it.
1432 */
tep_filter_reset(struct event_filter * filter)1433 void tep_filter_reset(struct event_filter *filter)
1434 {
1435 int i;
1436
1437 for (i = 0; i < filter->filters; i++)
1438 free_filter_type(&filter->event_filters[i]);
1439
1440 free(filter->event_filters);
1441 filter->filters = 0;
1442 filter->event_filters = NULL;
1443 }
1444
tep_filter_free(struct event_filter * filter)1445 void tep_filter_free(struct event_filter *filter)
1446 {
1447 tep_unref(filter->pevent);
1448
1449 tep_filter_reset(filter);
1450
1451 free(filter);
1452 }
1453
1454 static char *arg_to_str(struct event_filter *filter, struct filter_arg *arg);
1455
copy_filter_type(struct event_filter * filter,struct event_filter * source,struct filter_type * filter_type)1456 static int copy_filter_type(struct event_filter *filter,
1457 struct event_filter *source,
1458 struct filter_type *filter_type)
1459 {
1460 struct filter_arg *arg;
1461 struct event_format *event;
1462 const char *sys;
1463 const char *name;
1464 char *str;
1465
1466 /* Can't assume that the pevent's are the same */
1467 sys = filter_type->event->system;
1468 name = filter_type->event->name;
1469 event = tep_find_event_by_name(filter->pevent, sys, name);
1470 if (!event)
1471 return -1;
1472
1473 str = arg_to_str(source, filter_type->filter);
1474 if (!str)
1475 return -1;
1476
1477 if (strcmp(str, "TRUE") == 0 || strcmp(str, "FALSE") == 0) {
1478 /* Add trivial event */
1479 arg = allocate_arg();
1480 if (arg == NULL) {
1481 free(str);
1482 return -1;
1483 }
1484
1485 arg->type = FILTER_ARG_BOOLEAN;
1486 if (strcmp(str, "TRUE") == 0)
1487 arg->boolean.value = 1;
1488 else
1489 arg->boolean.value = 0;
1490
1491 filter_type = add_filter_type(filter, event->id);
1492 if (filter_type == NULL) {
1493 free(str);
1494 free_arg(arg);
1495 return -1;
1496 }
1497
1498 filter_type->filter = arg;
1499
1500 free(str);
1501 return 0;
1502 }
1503
1504 filter_event(filter, event, str, NULL);
1505 free(str);
1506
1507 return 0;
1508 }
1509
1510 /**
1511 * tep_filter_copy - copy a filter using another filter
1512 * @dest - the filter to copy to
1513 * @source - the filter to copy from
1514 *
1515 * Returns 0 on success and -1 if not all filters were copied
1516 */
tep_filter_copy(struct event_filter * dest,struct event_filter * source)1517 int tep_filter_copy(struct event_filter *dest, struct event_filter *source)
1518 {
1519 int ret = 0;
1520 int i;
1521
1522 tep_filter_reset(dest);
1523
1524 for (i = 0; i < source->filters; i++) {
1525 if (copy_filter_type(dest, source, &source->event_filters[i]))
1526 ret = -1;
1527 }
1528 return ret;
1529 }
1530
1531
1532 /**
1533 * tep_update_trivial - update the trivial filters with the given filter
1534 * @dest - the filter to update
1535 * @source - the filter as the source of the update
1536 * @type - the type of trivial filter to update.
1537 *
1538 * Scan dest for trivial events matching @type to replace with the source.
1539 *
1540 * Returns 0 on success and -1 if there was a problem updating, but
1541 * events may have still been updated on error.
1542 */
tep_update_trivial(struct event_filter * dest,struct event_filter * source,enum filter_trivial_type type)1543 int tep_update_trivial(struct event_filter *dest, struct event_filter *source,
1544 enum filter_trivial_type type)
1545 {
1546 struct tep_handle *src_pevent;
1547 struct tep_handle *dest_pevent;
1548 struct event_format *event;
1549 struct filter_type *filter_type;
1550 struct filter_arg *arg;
1551 char *str;
1552 int i;
1553
1554 src_pevent = source->pevent;
1555 dest_pevent = dest->pevent;
1556
1557 /* Do nothing if either of the filters has nothing to filter */
1558 if (!dest->filters || !source->filters)
1559 return 0;
1560
1561 for (i = 0; i < dest->filters; i++) {
1562 filter_type = &dest->event_filters[i];
1563 arg = filter_type->filter;
1564 if (arg->type != FILTER_ARG_BOOLEAN)
1565 continue;
1566 if ((arg->boolean.value && type == FILTER_TRIVIAL_FALSE) ||
1567 (!arg->boolean.value && type == FILTER_TRIVIAL_TRUE))
1568 continue;
1569
1570 event = filter_type->event;
1571
1572 if (src_pevent != dest_pevent) {
1573 /* do a look up */
1574 event = tep_find_event_by_name(src_pevent,
1575 event->system,
1576 event->name);
1577 if (!event)
1578 return -1;
1579 }
1580
1581 str = tep_filter_make_string(source, event->id);
1582 if (!str)
1583 continue;
1584
1585 /* Don't bother if the filter is trivial too */
1586 if (strcmp(str, "TRUE") != 0 && strcmp(str, "FALSE") != 0)
1587 filter_event(dest, event, str, NULL);
1588 free(str);
1589 }
1590 return 0;
1591 }
1592
1593 /**
1594 * tep_filter_clear_trivial - clear TRUE and FALSE filters
1595 * @filter: the filter to remove trivial filters from
1596 * @type: remove only true, false, or both
1597 *
1598 * Removes filters that only contain a TRUE or FALES boolean arg.
1599 *
1600 * Returns 0 on success and -1 if there was a problem.
1601 */
tep_filter_clear_trivial(struct event_filter * filter,enum filter_trivial_type type)1602 int tep_filter_clear_trivial(struct event_filter *filter,
1603 enum filter_trivial_type type)
1604 {
1605 struct filter_type *filter_type;
1606 int count = 0;
1607 int *ids = NULL;
1608 int i;
1609
1610 if (!filter->filters)
1611 return 0;
1612
1613 /*
1614 * Two steps, first get all ids with trivial filters.
1615 * then remove those ids.
1616 */
1617 for (i = 0; i < filter->filters; i++) {
1618 int *new_ids;
1619
1620 filter_type = &filter->event_filters[i];
1621 if (filter_type->filter->type != FILTER_ARG_BOOLEAN)
1622 continue;
1623 switch (type) {
1624 case FILTER_TRIVIAL_FALSE:
1625 if (filter_type->filter->boolean.value)
1626 continue;
1627 break;
1628 case FILTER_TRIVIAL_TRUE:
1629 if (!filter_type->filter->boolean.value)
1630 continue;
1631 default:
1632 break;
1633 }
1634
1635 new_ids = realloc(ids, sizeof(*ids) * (count + 1));
1636 if (!new_ids) {
1637 free(ids);
1638 return -1;
1639 }
1640
1641 ids = new_ids;
1642 ids[count++] = filter_type->event_id;
1643 }
1644
1645 if (!count)
1646 return 0;
1647
1648 for (i = 0; i < count; i++)
1649 tep_filter_remove_event(filter, ids[i]);
1650
1651 free(ids);
1652 return 0;
1653 }
1654
1655 /**
1656 * tep_filter_event_has_trivial - return true event contains trivial filter
1657 * @filter: the filter with the information
1658 * @event_id: the id of the event to test
1659 * @type: trivial type to test for (TRUE, FALSE, EITHER)
1660 *
1661 * Returns 1 if the event contains a matching trivial type
1662 * otherwise 0.
1663 */
tep_filter_event_has_trivial(struct event_filter * filter,int event_id,enum filter_trivial_type type)1664 int tep_filter_event_has_trivial(struct event_filter *filter,
1665 int event_id,
1666 enum filter_trivial_type type)
1667 {
1668 struct filter_type *filter_type;
1669
1670 if (!filter->filters)
1671 return 0;
1672
1673 filter_type = find_filter_type(filter, event_id);
1674
1675 if (!filter_type)
1676 return 0;
1677
1678 if (filter_type->filter->type != FILTER_ARG_BOOLEAN)
1679 return 0;
1680
1681 switch (type) {
1682 case FILTER_TRIVIAL_FALSE:
1683 return !filter_type->filter->boolean.value;
1684
1685 case FILTER_TRIVIAL_TRUE:
1686 return filter_type->filter->boolean.value;
1687 default:
1688 return 1;
1689 }
1690 }
1691
1692 static int test_filter(struct event_format *event, struct filter_arg *arg,
1693 struct tep_record *record, enum tep_errno *err);
1694
1695 static const char *
get_comm(struct event_format * event,struct tep_record * record)1696 get_comm(struct event_format *event, struct tep_record *record)
1697 {
1698 const char *comm;
1699 int pid;
1700
1701 pid = tep_data_pid(event->pevent, record);
1702 comm = tep_data_comm_from_pid(event->pevent, pid);
1703 return comm;
1704 }
1705
1706 static unsigned long long
get_value(struct event_format * event,struct format_field * field,struct tep_record * record)1707 get_value(struct event_format *event,
1708 struct format_field *field, struct tep_record *record)
1709 {
1710 unsigned long long val;
1711
1712 /* Handle our dummy "comm" field */
1713 if (field == &comm) {
1714 const char *name;
1715
1716 name = get_comm(event, record);
1717 return (unsigned long)name;
1718 }
1719
1720 /* Handle our dummy "cpu" field */
1721 if (field == &cpu)
1722 return record->cpu;
1723
1724 tep_read_number_field(field, record->data, &val);
1725
1726 if (!(field->flags & FIELD_IS_SIGNED))
1727 return val;
1728
1729 switch (field->size) {
1730 case 1:
1731 return (char)val;
1732 case 2:
1733 return (short)val;
1734 case 4:
1735 return (int)val;
1736 case 8:
1737 return (long long)val;
1738 }
1739 return val;
1740 }
1741
1742 static unsigned long long
1743 get_arg_value(struct event_format *event, struct filter_arg *arg,
1744 struct tep_record *record, enum tep_errno *err);
1745
1746 static unsigned long long
get_exp_value(struct event_format * event,struct filter_arg * arg,struct tep_record * record,enum tep_errno * err)1747 get_exp_value(struct event_format *event, struct filter_arg *arg,
1748 struct tep_record *record, enum tep_errno *err)
1749 {
1750 unsigned long long lval, rval;
1751
1752 lval = get_arg_value(event, arg->exp.left, record, err);
1753 rval = get_arg_value(event, arg->exp.right, record, err);
1754
1755 if (*err) {
1756 /*
1757 * There was an error, no need to process anymore.
1758 */
1759 return 0;
1760 }
1761
1762 switch (arg->exp.type) {
1763 case FILTER_EXP_ADD:
1764 return lval + rval;
1765
1766 case FILTER_EXP_SUB:
1767 return lval - rval;
1768
1769 case FILTER_EXP_MUL:
1770 return lval * rval;
1771
1772 case FILTER_EXP_DIV:
1773 return lval / rval;
1774
1775 case FILTER_EXP_MOD:
1776 return lval % rval;
1777
1778 case FILTER_EXP_RSHIFT:
1779 return lval >> rval;
1780
1781 case FILTER_EXP_LSHIFT:
1782 return lval << rval;
1783
1784 case FILTER_EXP_AND:
1785 return lval & rval;
1786
1787 case FILTER_EXP_OR:
1788 return lval | rval;
1789
1790 case FILTER_EXP_XOR:
1791 return lval ^ rval;
1792
1793 case FILTER_EXP_NOT:
1794 default:
1795 if (!*err)
1796 *err = TEP_ERRNO__INVALID_EXP_TYPE;
1797 }
1798 return 0;
1799 }
1800
1801 static unsigned long long
get_arg_value(struct event_format * event,struct filter_arg * arg,struct tep_record * record,enum tep_errno * err)1802 get_arg_value(struct event_format *event, struct filter_arg *arg,
1803 struct tep_record *record, enum tep_errno *err)
1804 {
1805 switch (arg->type) {
1806 case FILTER_ARG_FIELD:
1807 return get_value(event, arg->field.field, record);
1808
1809 case FILTER_ARG_VALUE:
1810 if (arg->value.type != FILTER_NUMBER) {
1811 if (!*err)
1812 *err = TEP_ERRNO__NOT_A_NUMBER;
1813 }
1814 return arg->value.val;
1815
1816 case FILTER_ARG_EXP:
1817 return get_exp_value(event, arg, record, err);
1818
1819 default:
1820 if (!*err)
1821 *err = TEP_ERRNO__INVALID_ARG_TYPE;
1822 }
1823 return 0;
1824 }
1825
test_num(struct event_format * event,struct filter_arg * arg,struct tep_record * record,enum tep_errno * err)1826 static int test_num(struct event_format *event, struct filter_arg *arg,
1827 struct tep_record *record, enum tep_errno *err)
1828 {
1829 unsigned long long lval, rval;
1830
1831 lval = get_arg_value(event, arg->num.left, record, err);
1832 rval = get_arg_value(event, arg->num.right, record, err);
1833
1834 if (*err) {
1835 /*
1836 * There was an error, no need to process anymore.
1837 */
1838 return 0;
1839 }
1840
1841 switch (arg->num.type) {
1842 case FILTER_CMP_EQ:
1843 return lval == rval;
1844
1845 case FILTER_CMP_NE:
1846 return lval != rval;
1847
1848 case FILTER_CMP_GT:
1849 return lval > rval;
1850
1851 case FILTER_CMP_LT:
1852 return lval < rval;
1853
1854 case FILTER_CMP_GE:
1855 return lval >= rval;
1856
1857 case FILTER_CMP_LE:
1858 return lval <= rval;
1859
1860 default:
1861 if (!*err)
1862 *err = TEP_ERRNO__ILLEGAL_INTEGER_CMP;
1863 return 0;
1864 }
1865 }
1866
get_field_str(struct filter_arg * arg,struct tep_record * record)1867 static const char *get_field_str(struct filter_arg *arg, struct tep_record *record)
1868 {
1869 struct event_format *event;
1870 struct tep_handle *pevent;
1871 unsigned long long addr;
1872 const char *val = NULL;
1873 unsigned int size;
1874 char hex[64];
1875
1876 /* If the field is not a string convert it */
1877 if (arg->str.field->flags & FIELD_IS_STRING) {
1878 val = record->data + arg->str.field->offset;
1879 size = arg->str.field->size;
1880
1881 if (arg->str.field->flags & FIELD_IS_DYNAMIC) {
1882 addr = *(unsigned int *)val;
1883 val = record->data + (addr & 0xffff);
1884 size = addr >> 16;
1885 }
1886
1887 /*
1888 * We need to copy the data since we can't be sure the field
1889 * is null terminated.
1890 */
1891 if (*(val + size - 1)) {
1892 /* copy it */
1893 memcpy(arg->str.buffer, val, arg->str.field->size);
1894 /* the buffer is already NULL terminated */
1895 val = arg->str.buffer;
1896 }
1897
1898 } else {
1899 event = arg->str.field->event;
1900 pevent = event->pevent;
1901 addr = get_value(event, arg->str.field, record);
1902
1903 if (arg->str.field->flags & (FIELD_IS_POINTER | FIELD_IS_LONG))
1904 /* convert to a kernel symbol */
1905 val = tep_find_function(pevent, addr);
1906
1907 if (val == NULL) {
1908 /* just use the hex of the string name */
1909 snprintf(hex, 64, "0x%llx", addr);
1910 val = hex;
1911 }
1912 }
1913
1914 return val;
1915 }
1916
test_str(struct event_format * event,struct filter_arg * arg,struct tep_record * record,enum tep_errno * err)1917 static int test_str(struct event_format *event, struct filter_arg *arg,
1918 struct tep_record *record, enum tep_errno *err)
1919 {
1920 const char *val;
1921
1922 if (arg->str.field == &comm)
1923 val = get_comm(event, record);
1924 else
1925 val = get_field_str(arg, record);
1926
1927 switch (arg->str.type) {
1928 case FILTER_CMP_MATCH:
1929 return strcmp(val, arg->str.val) == 0;
1930
1931 case FILTER_CMP_NOT_MATCH:
1932 return strcmp(val, arg->str.val) != 0;
1933
1934 case FILTER_CMP_REGEX:
1935 /* Returns zero on match */
1936 return !regexec(&arg->str.reg, val, 0, NULL, 0);
1937
1938 case FILTER_CMP_NOT_REGEX:
1939 return regexec(&arg->str.reg, val, 0, NULL, 0);
1940
1941 default:
1942 if (!*err)
1943 *err = TEP_ERRNO__ILLEGAL_STRING_CMP;
1944 return 0;
1945 }
1946 }
1947
test_op(struct event_format * event,struct filter_arg * arg,struct tep_record * record,enum tep_errno * err)1948 static int test_op(struct event_format *event, struct filter_arg *arg,
1949 struct tep_record *record, enum tep_errno *err)
1950 {
1951 switch (arg->op.type) {
1952 case FILTER_OP_AND:
1953 return test_filter(event, arg->op.left, record, err) &&
1954 test_filter(event, arg->op.right, record, err);
1955
1956 case FILTER_OP_OR:
1957 return test_filter(event, arg->op.left, record, err) ||
1958 test_filter(event, arg->op.right, record, err);
1959
1960 case FILTER_OP_NOT:
1961 return !test_filter(event, arg->op.right, record, err);
1962
1963 default:
1964 if (!*err)
1965 *err = TEP_ERRNO__INVALID_OP_TYPE;
1966 return 0;
1967 }
1968 }
1969
test_filter(struct event_format * event,struct filter_arg * arg,struct tep_record * record,enum tep_errno * err)1970 static int test_filter(struct event_format *event, struct filter_arg *arg,
1971 struct tep_record *record, enum tep_errno *err)
1972 {
1973 if (*err) {
1974 /*
1975 * There was an error, no need to process anymore.
1976 */
1977 return 0;
1978 }
1979
1980 switch (arg->type) {
1981 case FILTER_ARG_BOOLEAN:
1982 /* easy case */
1983 return arg->boolean.value;
1984
1985 case FILTER_ARG_OP:
1986 return test_op(event, arg, record, err);
1987
1988 case FILTER_ARG_NUM:
1989 return test_num(event, arg, record, err);
1990
1991 case FILTER_ARG_STR:
1992 return test_str(event, arg, record, err);
1993
1994 case FILTER_ARG_EXP:
1995 case FILTER_ARG_VALUE:
1996 case FILTER_ARG_FIELD:
1997 /*
1998 * Expressions, fields and values evaluate
1999 * to true if they return non zero
2000 */
2001 return !!get_arg_value(event, arg, record, err);
2002
2003 default:
2004 if (!*err)
2005 *err = TEP_ERRNO__INVALID_ARG_TYPE;
2006 return 0;
2007 }
2008 }
2009
2010 /**
2011 * tep_event_filtered - return true if event has filter
2012 * @filter: filter struct with filter information
2013 * @event_id: event id to test if filter exists
2014 *
2015 * Returns 1 if filter found for @event_id
2016 * otherwise 0;
2017 */
tep_event_filtered(struct event_filter * filter,int event_id)2018 int tep_event_filtered(struct event_filter *filter, int event_id)
2019 {
2020 struct filter_type *filter_type;
2021
2022 if (!filter->filters)
2023 return 0;
2024
2025 filter_type = find_filter_type(filter, event_id);
2026
2027 return filter_type ? 1 : 0;
2028 }
2029
2030 /**
2031 * tep_filter_match - test if a record matches a filter
2032 * @filter: filter struct with filter information
2033 * @record: the record to test against the filter
2034 *
2035 * Returns: match result or error code (prefixed with TEP_ERRNO__)
2036 * FILTER_MATCH - filter found for event and @record matches
2037 * FILTER_MISS - filter found for event and @record does not match
2038 * FILTER_NOT_FOUND - no filter found for @record's event
2039 * NO_FILTER - if no filters exist
2040 * otherwise - error occurred during test
2041 */
tep_filter_match(struct event_filter * filter,struct tep_record * record)2042 enum tep_errno tep_filter_match(struct event_filter *filter,
2043 struct tep_record *record)
2044 {
2045 struct tep_handle *pevent = filter->pevent;
2046 struct filter_type *filter_type;
2047 int event_id;
2048 int ret;
2049 enum tep_errno err = 0;
2050
2051 filter_init_error_buf(filter);
2052
2053 if (!filter->filters)
2054 return TEP_ERRNO__NO_FILTER;
2055
2056 event_id = tep_data_type(pevent, record);
2057
2058 filter_type = find_filter_type(filter, event_id);
2059 if (!filter_type)
2060 return TEP_ERRNO__FILTER_NOT_FOUND;
2061
2062 ret = test_filter(filter_type->event, filter_type->filter, record, &err);
2063 if (err)
2064 return err;
2065
2066 return ret ? TEP_ERRNO__FILTER_MATCH : TEP_ERRNO__FILTER_MISS;
2067 }
2068
op_to_str(struct event_filter * filter,struct filter_arg * arg)2069 static char *op_to_str(struct event_filter *filter, struct filter_arg *arg)
2070 {
2071 char *str = NULL;
2072 char *left = NULL;
2073 char *right = NULL;
2074 char *op = NULL;
2075 int left_val = -1;
2076 int right_val = -1;
2077 int val;
2078
2079 switch (arg->op.type) {
2080 case FILTER_OP_AND:
2081 op = "&&";
2082 /* fall through */
2083 case FILTER_OP_OR:
2084 if (!op)
2085 op = "||";
2086
2087 left = arg_to_str(filter, arg->op.left);
2088 right = arg_to_str(filter, arg->op.right);
2089 if (!left || !right)
2090 break;
2091
2092 /* Try to consolidate boolean values */
2093 if (strcmp(left, "TRUE") == 0)
2094 left_val = 1;
2095 else if (strcmp(left, "FALSE") == 0)
2096 left_val = 0;
2097
2098 if (strcmp(right, "TRUE") == 0)
2099 right_val = 1;
2100 else if (strcmp(right, "FALSE") == 0)
2101 right_val = 0;
2102
2103 if (left_val >= 0) {
2104 if ((arg->op.type == FILTER_OP_AND && !left_val) ||
2105 (arg->op.type == FILTER_OP_OR && left_val)) {
2106 /* Just return left value */
2107 str = left;
2108 left = NULL;
2109 break;
2110 }
2111 if (right_val >= 0) {
2112 /* just evaluate this. */
2113 val = 0;
2114 switch (arg->op.type) {
2115 case FILTER_OP_AND:
2116 val = left_val && right_val;
2117 break;
2118 case FILTER_OP_OR:
2119 val = left_val || right_val;
2120 break;
2121 default:
2122 break;
2123 }
2124 asprintf(&str, val ? "TRUE" : "FALSE");
2125 break;
2126 }
2127 }
2128 if (right_val >= 0) {
2129 if ((arg->op.type == FILTER_OP_AND && !right_val) ||
2130 (arg->op.type == FILTER_OP_OR && right_val)) {
2131 /* Just return right value */
2132 str = right;
2133 right = NULL;
2134 break;
2135 }
2136 /* The right value is meaningless */
2137 str = left;
2138 left = NULL;
2139 break;
2140 }
2141
2142 asprintf(&str, "(%s) %s (%s)", left, op, right);
2143 break;
2144
2145 case FILTER_OP_NOT:
2146 op = "!";
2147 right = arg_to_str(filter, arg->op.right);
2148 if (!right)
2149 break;
2150
2151 /* See if we can consolidate */
2152 if (strcmp(right, "TRUE") == 0)
2153 right_val = 1;
2154 else if (strcmp(right, "FALSE") == 0)
2155 right_val = 0;
2156 if (right_val >= 0) {
2157 /* just return the opposite */
2158 asprintf(&str, right_val ? "FALSE" : "TRUE");
2159 break;
2160 }
2161 asprintf(&str, "%s(%s)", op, right);
2162 break;
2163
2164 default:
2165 /* ?? */
2166 break;
2167 }
2168 free(left);
2169 free(right);
2170 return str;
2171 }
2172
val_to_str(struct event_filter * filter,struct filter_arg * arg)2173 static char *val_to_str(struct event_filter *filter, struct filter_arg *arg)
2174 {
2175 char *str = NULL;
2176
2177 asprintf(&str, "%lld", arg->value.val);
2178
2179 return str;
2180 }
2181
field_to_str(struct event_filter * filter,struct filter_arg * arg)2182 static char *field_to_str(struct event_filter *filter, struct filter_arg *arg)
2183 {
2184 return strdup(arg->field.field->name);
2185 }
2186
exp_to_str(struct event_filter * filter,struct filter_arg * arg)2187 static char *exp_to_str(struct event_filter *filter, struct filter_arg *arg)
2188 {
2189 char *lstr;
2190 char *rstr;
2191 char *op;
2192 char *str = NULL;
2193
2194 lstr = arg_to_str(filter, arg->exp.left);
2195 rstr = arg_to_str(filter, arg->exp.right);
2196 if (!lstr || !rstr)
2197 goto out;
2198
2199 switch (arg->exp.type) {
2200 case FILTER_EXP_ADD:
2201 op = "+";
2202 break;
2203 case FILTER_EXP_SUB:
2204 op = "-";
2205 break;
2206 case FILTER_EXP_MUL:
2207 op = "*";
2208 break;
2209 case FILTER_EXP_DIV:
2210 op = "/";
2211 break;
2212 case FILTER_EXP_MOD:
2213 op = "%";
2214 break;
2215 case FILTER_EXP_RSHIFT:
2216 op = ">>";
2217 break;
2218 case FILTER_EXP_LSHIFT:
2219 op = "<<";
2220 break;
2221 case FILTER_EXP_AND:
2222 op = "&";
2223 break;
2224 case FILTER_EXP_OR:
2225 op = "|";
2226 break;
2227 case FILTER_EXP_XOR:
2228 op = "^";
2229 break;
2230 default:
2231 op = "[ERROR IN EXPRESSION TYPE]";
2232 break;
2233 }
2234
2235 asprintf(&str, "%s %s %s", lstr, op, rstr);
2236 out:
2237 free(lstr);
2238 free(rstr);
2239
2240 return str;
2241 }
2242
num_to_str(struct event_filter * filter,struct filter_arg * arg)2243 static char *num_to_str(struct event_filter *filter, struct filter_arg *arg)
2244 {
2245 char *lstr;
2246 char *rstr;
2247 char *str = NULL;
2248 char *op = NULL;
2249
2250 lstr = arg_to_str(filter, arg->num.left);
2251 rstr = arg_to_str(filter, arg->num.right);
2252 if (!lstr || !rstr)
2253 goto out;
2254
2255 switch (arg->num.type) {
2256 case FILTER_CMP_EQ:
2257 op = "==";
2258 /* fall through */
2259 case FILTER_CMP_NE:
2260 if (!op)
2261 op = "!=";
2262 /* fall through */
2263 case FILTER_CMP_GT:
2264 if (!op)
2265 op = ">";
2266 /* fall through */
2267 case FILTER_CMP_LT:
2268 if (!op)
2269 op = "<";
2270 /* fall through */
2271 case FILTER_CMP_GE:
2272 if (!op)
2273 op = ">=";
2274 /* fall through */
2275 case FILTER_CMP_LE:
2276 if (!op)
2277 op = "<=";
2278
2279 asprintf(&str, "%s %s %s", lstr, op, rstr);
2280 break;
2281
2282 default:
2283 /* ?? */
2284 break;
2285 }
2286
2287 out:
2288 free(lstr);
2289 free(rstr);
2290 return str;
2291 }
2292
str_to_str(struct event_filter * filter,struct filter_arg * arg)2293 static char *str_to_str(struct event_filter *filter, struct filter_arg *arg)
2294 {
2295 char *str = NULL;
2296 char *op = NULL;
2297
2298 switch (arg->str.type) {
2299 case FILTER_CMP_MATCH:
2300 op = "==";
2301 /* fall through */
2302 case FILTER_CMP_NOT_MATCH:
2303 if (!op)
2304 op = "!=";
2305 /* fall through */
2306 case FILTER_CMP_REGEX:
2307 if (!op)
2308 op = "=~";
2309 /* fall through */
2310 case FILTER_CMP_NOT_REGEX:
2311 if (!op)
2312 op = "!~";
2313
2314 asprintf(&str, "%s %s \"%s\"",
2315 arg->str.field->name, op, arg->str.val);
2316 break;
2317
2318 default:
2319 /* ?? */
2320 break;
2321 }
2322 return str;
2323 }
2324
arg_to_str(struct event_filter * filter,struct filter_arg * arg)2325 static char *arg_to_str(struct event_filter *filter, struct filter_arg *arg)
2326 {
2327 char *str = NULL;
2328
2329 switch (arg->type) {
2330 case FILTER_ARG_BOOLEAN:
2331 asprintf(&str, arg->boolean.value ? "TRUE" : "FALSE");
2332 return str;
2333
2334 case FILTER_ARG_OP:
2335 return op_to_str(filter, arg);
2336
2337 case FILTER_ARG_NUM:
2338 return num_to_str(filter, arg);
2339
2340 case FILTER_ARG_STR:
2341 return str_to_str(filter, arg);
2342
2343 case FILTER_ARG_VALUE:
2344 return val_to_str(filter, arg);
2345
2346 case FILTER_ARG_FIELD:
2347 return field_to_str(filter, arg);
2348
2349 case FILTER_ARG_EXP:
2350 return exp_to_str(filter, arg);
2351
2352 default:
2353 /* ?? */
2354 return NULL;
2355 }
2356
2357 }
2358
2359 /**
2360 * tep_filter_make_string - return a string showing the filter
2361 * @filter: filter struct with filter information
2362 * @event_id: the event id to return the filter string with
2363 *
2364 * Returns a string that displays the filter contents.
2365 * This string must be freed with free(str).
2366 * NULL is returned if no filter is found or allocation failed.
2367 */
2368 char *
tep_filter_make_string(struct event_filter * filter,int event_id)2369 tep_filter_make_string(struct event_filter *filter, int event_id)
2370 {
2371 struct filter_type *filter_type;
2372
2373 if (!filter->filters)
2374 return NULL;
2375
2376 filter_type = find_filter_type(filter, event_id);
2377
2378 if (!filter_type)
2379 return NULL;
2380
2381 return arg_to_str(filter, filter_type->filter);
2382 }
2383
2384 /**
2385 * tep_filter_compare - compare two filters and return if they are the same
2386 * @filter1: Filter to compare with @filter2
2387 * @filter2: Filter to compare with @filter1
2388 *
2389 * Returns:
2390 * 1 if the two filters hold the same content.
2391 * 0 if they do not.
2392 */
tep_filter_compare(struct event_filter * filter1,struct event_filter * filter2)2393 int tep_filter_compare(struct event_filter *filter1, struct event_filter *filter2)
2394 {
2395 struct filter_type *filter_type1;
2396 struct filter_type *filter_type2;
2397 char *str1, *str2;
2398 int result;
2399 int i;
2400
2401 /* Do the easy checks first */
2402 if (filter1->filters != filter2->filters)
2403 return 0;
2404 if (!filter1->filters && !filter2->filters)
2405 return 1;
2406
2407 /*
2408 * Now take a look at each of the events to see if they have the same
2409 * filters to them.
2410 */
2411 for (i = 0; i < filter1->filters; i++) {
2412 filter_type1 = &filter1->event_filters[i];
2413 filter_type2 = find_filter_type(filter2, filter_type1->event_id);
2414 if (!filter_type2)
2415 break;
2416 if (filter_type1->filter->type != filter_type2->filter->type)
2417 break;
2418 switch (filter_type1->filter->type) {
2419 case FILTER_TRIVIAL_FALSE:
2420 case FILTER_TRIVIAL_TRUE:
2421 /* trivial types just need the type compared */
2422 continue;
2423 default:
2424 break;
2425 }
2426 /* The best way to compare complex filters is with strings */
2427 str1 = arg_to_str(filter1, filter_type1->filter);
2428 str2 = arg_to_str(filter2, filter_type2->filter);
2429 if (str1 && str2)
2430 result = strcmp(str1, str2) != 0;
2431 else
2432 /* bail out if allocation fails */
2433 result = 1;
2434
2435 free(str1);
2436 free(str2);
2437 if (result)
2438 break;
2439 }
2440
2441 if (i < filter1->filters)
2442 return 0;
2443 return 1;
2444 }
2445
2446