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