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