1 /* 2 * Copyright (c) Ian F. Darwin 1986-1995. 3 * Software written by Ian F. Darwin and others; 4 * maintained 1995-present by Christos Zoulas and others. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice immediately at the beginning of the file, without modification, 11 * this list of conditions, and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 /* 29 * softmagic - interpret variable magic from MAGIC 30 */ 31 32 #include "file.h" 33 34 #ifndef lint 35 FILE_RCSID("@(#)$File: softmagic.c,v 1.138 2009/10/19 13:10:20 christos Exp $") 36 #endif /* lint */ 37 38 #include "magic.h" 39 #include <string.h> 40 #include <ctype.h> 41 #include <stdlib.h> 42 #include <time.h> 43 44 45 private int match(struct magic_set *, struct magic *, uint32_t, 46 const unsigned char *, size_t, int); 47 private int mget(struct magic_set *, const unsigned char *, 48 struct magic *, size_t, unsigned int); 49 private int magiccheck(struct magic_set *, struct magic *); 50 private int32_t mprint(struct magic_set *, struct magic *); 51 private int32_t moffset(struct magic_set *, struct magic *); 52 private void mdebug(uint32_t, const char *, size_t); 53 private int mcopy(struct magic_set *, union VALUETYPE *, int, int, 54 const unsigned char *, uint32_t, size_t, size_t); 55 private int mconvert(struct magic_set *, struct magic *); 56 private int print_sep(struct magic_set *, int); 57 private int handle_annotation(struct magic_set *, struct magic *); 58 private void cvt_8(union VALUETYPE *, const struct magic *); 59 private void cvt_16(union VALUETYPE *, const struct magic *); 60 private void cvt_32(union VALUETYPE *, const struct magic *); 61 private void cvt_64(union VALUETYPE *, const struct magic *); 62 63 /* 64 * softmagic - lookup one file in parsed, in-memory copy of database 65 * Passed the name and FILE * of one file to be typed. 66 */ 67 /*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */ 68 protected int 69 file_softmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes, int mode) 70 { 71 struct mlist *ml; 72 int rv; 73 for (ml = ms->mlist->next; ml != ms->mlist; ml = ml->next) 74 if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, mode)) != 0) 75 return rv; 76 77 return 0; 78 } 79 80 /* 81 * Go through the whole list, stopping if you find a match. Process all 82 * the continuations of that match before returning. 83 * 84 * We support multi-level continuations: 85 * 86 * At any time when processing a successful top-level match, there is a 87 * current continuation level; it represents the level of the last 88 * successfully matched continuation. 89 * 90 * Continuations above that level are skipped as, if we see one, it 91 * means that the continuation that controls them - i.e, the 92 * lower-level continuation preceding them - failed to match. 93 * 94 * Continuations below that level are processed as, if we see one, 95 * it means we've finished processing or skipping higher-level 96 * continuations under the control of a successful or unsuccessful 97 * lower-level continuation, and are now seeing the next lower-level 98 * continuation and should process it. The current continuation 99 * level reverts to the level of the one we're seeing. 100 * 101 * Continuations at the current level are processed as, if we see 102 * one, there's no lower-level continuation that may have failed. 103 * 104 * If a continuation matches, we bump the current continuation level 105 * so that higher-level continuations are processed. 106 */ 107 private int 108 match(struct magic_set *ms, struct magic *magic, uint32_t nmagic, 109 const unsigned char *s, size_t nbytes, int mode) 110 { 111 uint32_t magindex = 0; 112 unsigned int cont_level = 0; 113 int need_separator = 0; 114 int returnval = 0, e; /* if a match is found it is set to 1*/ 115 int firstline = 1; /* a flag to print X\n X\n- X */ 116 int printed_something = 0; 117 int print = (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0; 118 119 if (file_check_mem(ms, cont_level) == -1) 120 return -1; 121 122 for (magindex = 0; magindex < nmagic; magindex++) { 123 int flush = 0; 124 struct magic *m = &magic[magindex]; 125 126 if ((m->flag & mode) != mode) { 127 /* Skip sub-tests */ 128 while (magic[magindex + 1].cont_level != 0 && 129 ++magindex < nmagic) 130 continue; 131 continue; /* Skip to next top-level test*/ 132 } 133 134 ms->offset = m->offset; 135 ms->line = m->lineno; 136 137 /* if main entry matches, print it... */ 138 switch (mget(ms, s, m, nbytes, cont_level)) { 139 case -1: 140 return -1; 141 case 0: 142 flush = m->reln != '!'; 143 break; 144 default: 145 if (m->type == FILE_INDIRECT) 146 returnval = 1; 147 148 switch (magiccheck(ms, m)) { 149 case -1: 150 return -1; 151 case 0: 152 flush++; 153 break; 154 default: 155 flush = 0; 156 break; 157 } 158 break; 159 } 160 if (flush) { 161 /* 162 * main entry didn't match, 163 * flush its continuations 164 */ 165 while (magindex < nmagic - 1 && 166 magic[magindex + 1].cont_level != 0) 167 magindex++; 168 continue; 169 } 170 171 /* 172 * If we are going to print something, we'll need to print 173 * a blank before we print something else. 174 */ 175 if (*m->desc) { 176 need_separator = 1; 177 printed_something = 1; 178 if ((e = handle_annotation(ms, m)) != 0) 179 return e; 180 if (print_sep(ms, firstline) == -1) 181 return -1; 182 } 183 184 185 if (print && mprint(ms, m) == -1) 186 return -1; 187 188 ms->c.li[cont_level].off = moffset(ms, m); 189 190 /* and any continuations that match */ 191 if (file_check_mem(ms, ++cont_level) == -1) 192 return -1; 193 194 while (magic[magindex+1].cont_level != 0 && 195 ++magindex < nmagic) { 196 m = &magic[magindex]; 197 ms->line = m->lineno; /* for messages */ 198 199 if (cont_level < m->cont_level) 200 continue; 201 if (cont_level > m->cont_level) { 202 /* 203 * We're at the end of the level 204 * "cont_level" continuations. 205 */ 206 cont_level = m->cont_level; 207 } 208 ms->offset = m->offset; 209 if (m->flag & OFFADD) { 210 ms->offset += 211 ms->c.li[cont_level - 1].off; 212 } 213 214 #ifdef ENABLE_CONDITIONALS 215 if (m->cond == COND_ELSE || 216 m->cond == COND_ELIF) { 217 if (ms->c.li[cont_level].last_match == 1) 218 continue; 219 } 220 #endif 221 switch (mget(ms, s, m, nbytes, cont_level)) { 222 case -1: 223 return -1; 224 case 0: 225 if (m->reln != '!') 226 continue; 227 flush = 1; 228 break; 229 default: 230 if (m->type == FILE_INDIRECT) 231 returnval = 1; 232 flush = 0; 233 break; 234 } 235 236 switch (flush ? 1 : magiccheck(ms, m)) { 237 case -1: 238 return -1; 239 case 0: 240 #ifdef ENABLE_CONDITIONALS 241 ms->c.li[cont_level].last_match = 0; 242 #endif 243 break; 244 default: 245 #ifdef ENABLE_CONDITIONALS 246 ms->c.li[cont_level].last_match = 1; 247 #endif 248 if (m->type != FILE_DEFAULT) 249 ms->c.li[cont_level].got_match = 1; 250 else if (ms->c.li[cont_level].got_match) { 251 ms->c.li[cont_level].got_match = 0; 252 break; 253 } 254 /* 255 * If we are going to print something, 256 * make sure that we have a separator first. 257 */ 258 if (*m->desc) { 259 if ((e = handle_annotation(ms, m)) != 0) 260 return e; 261 if (!printed_something) { 262 printed_something = 1; 263 if (print_sep(ms, firstline) 264 == -1) 265 return -1; 266 } 267 } 268 /* 269 * This continuation matched. Print 270 * its message, with a blank before it 271 * if the previous item printed and 272 * this item isn't empty. 273 */ 274 /* space if previous printed */ 275 if (need_separator 276 && ((m->flag & NOSPACE) == 0) 277 && *m->desc) { 278 if (print && 279 file_printf(ms, " ") == -1) 280 return -1; 281 need_separator = 0; 282 } 283 if (print && mprint(ms, m) == -1) 284 return -1; 285 286 ms->c.li[cont_level].off = moffset(ms, m); 287 288 if (*m->desc) 289 need_separator = 1; 290 291 /* 292 * If we see any continuations 293 * at a higher level, 294 * process them. 295 */ 296 if (file_check_mem(ms, ++cont_level) == -1) 297 return -1; 298 break; 299 } 300 } 301 if (printed_something) { 302 firstline = 0; 303 if (print) 304 returnval = 1; 305 } 306 if ((ms->flags & MAGIC_CONTINUE) == 0 && printed_something) { 307 return returnval; /* don't keep searching */ 308 } 309 } 310 return returnval; /* This is hit if -k is set or there is no match */ 311 } 312 313 private int 314 check_fmt(struct magic_set *ms, struct magic *m) 315 { 316 regex_t rx; 317 int rc; 318 319 if (strchr(m->desc, '%') == NULL) 320 return 0; 321 322 rc = regcomp(&rx, "%[-0-9\\.]*s", REG_EXTENDED|REG_NOSUB); 323 if (rc) { 324 char errmsg[512]; 325 (void)regerror(rc, &rx, errmsg, sizeof(errmsg)); 326 file_magerror(ms, "regex error %d, (%s)", rc, errmsg); 327 return -1; 328 } else { 329 rc = regexec(&rx, m->desc, 0, 0, 0); 330 regfree(&rx); 331 return !rc; 332 } 333 } 334 335 #ifndef HAVE_STRNDUP 336 char * strndup(const char *, size_t); 337 338 char * 339 strndup(const char *str, size_t n) 340 { 341 size_t len; 342 char *copy; 343 344 for (len = 0; len < n && str[len]; len++) 345 continue; 346 if ((copy = malloc(len + 1)) == NULL) 347 return NULL; 348 (void)memcpy(copy, str, len); 349 copy[len] = '\0'; 350 return copy; 351 } 352 #endif /* HAVE_STRNDUP */ 353 354 private int32_t 355 mprint(struct magic_set *ms, struct magic *m) 356 { 357 uint64_t v; 358 float vf; 359 double vd; 360 int64_t t = 0; 361 char buf[128]; 362 union VALUETYPE *p = &ms->ms_value; 363 364 switch (m->type) { 365 case FILE_BYTE: 366 v = file_signextend(ms, m, (uint64_t)p->b); 367 switch (check_fmt(ms, m)) { 368 case -1: 369 return -1; 370 case 1: 371 (void)snprintf(buf, sizeof(buf), "%c", 372 (unsigned char)v); 373 if (file_printf(ms, m->desc, buf) == -1) 374 return -1; 375 break; 376 default: 377 if (file_printf(ms, m->desc, (unsigned char) v) == -1) 378 return -1; 379 break; 380 } 381 t = ms->offset + sizeof(char); 382 break; 383 384 case FILE_SHORT: 385 case FILE_BESHORT: 386 case FILE_LESHORT: 387 v = file_signextend(ms, m, (uint64_t)p->h); 388 switch (check_fmt(ms, m)) { 389 case -1: 390 return -1; 391 case 1: 392 (void)snprintf(buf, sizeof(buf), "%hu", 393 (unsigned short)v); 394 if (file_printf(ms, m->desc, buf) == -1) 395 return -1; 396 break; 397 default: 398 if ( 399 file_printf(ms, m->desc, (unsigned short) v) == -1) 400 return -1; 401 break; 402 } 403 t = ms->offset + sizeof(short); 404 break; 405 406 case FILE_LONG: 407 case FILE_BELONG: 408 case FILE_LELONG: 409 case FILE_MELONG: 410 v = file_signextend(ms, m, (uint64_t)p->l); 411 switch (check_fmt(ms, m)) { 412 case -1: 413 return -1; 414 case 1: 415 (void)snprintf(buf, sizeof(buf), "%u", (uint32_t)v); 416 if (file_printf(ms, m->desc, buf) == -1) 417 return -1; 418 break; 419 default: 420 if (file_printf(ms, m->desc, (uint32_t) v) == -1) 421 return -1; 422 break; 423 } 424 t = ms->offset + sizeof(int32_t); 425 break; 426 427 case FILE_QUAD: 428 case FILE_BEQUAD: 429 case FILE_LEQUAD: 430 v = file_signextend(ms, m, p->q); 431 if (file_printf(ms, m->desc, (uint64_t) v) == -1) 432 return -1; 433 t = ms->offset + sizeof(int64_t); 434 break; 435 436 case FILE_STRING: 437 case FILE_PSTRING: 438 case FILE_BESTRING16: 439 case FILE_LESTRING16: 440 if (m->reln == '=' || m->reln == '!') { 441 if (file_printf(ms, m->desc, m->value.s) == -1) 442 return -1; 443 t = ms->offset + m->vallen; 444 } 445 else { 446 if (*m->value.s == '\0') 447 p->s[strcspn(p->s, "\n")] = '\0'; 448 if (file_printf(ms, m->desc, p->s) == -1) 449 return -1; 450 t = ms->offset + strlen(p->s); 451 if (m->type == FILE_PSTRING) 452 t++; 453 } 454 break; 455 456 case FILE_DATE: 457 case FILE_BEDATE: 458 case FILE_LEDATE: 459 case FILE_MEDATE: 460 if (file_printf(ms, m->desc, file_fmttime(p->l, 1)) == -1) 461 return -1; 462 t = ms->offset + sizeof(time_t); 463 break; 464 465 case FILE_LDATE: 466 case FILE_BELDATE: 467 case FILE_LELDATE: 468 case FILE_MELDATE: 469 if (file_printf(ms, m->desc, file_fmttime(p->l, 0)) == -1) 470 return -1; 471 t = ms->offset + sizeof(time_t); 472 break; 473 474 case FILE_QDATE: 475 case FILE_BEQDATE: 476 case FILE_LEQDATE: 477 if (file_printf(ms, m->desc, file_fmttime((uint32_t)p->q, 478 1)) == -1) 479 return -1; 480 t = ms->offset + sizeof(uint64_t); 481 break; 482 483 case FILE_QLDATE: 484 case FILE_BEQLDATE: 485 case FILE_LEQLDATE: 486 if (file_printf(ms, m->desc, file_fmttime((uint32_t)p->q, 487 0)) == -1) 488 return -1; 489 t = ms->offset + sizeof(uint64_t); 490 break; 491 492 case FILE_FLOAT: 493 case FILE_BEFLOAT: 494 case FILE_LEFLOAT: 495 vf = p->f; 496 switch (check_fmt(ms, m)) { 497 case -1: 498 return -1; 499 case 1: 500 (void)snprintf(buf, sizeof(buf), "%g", vf); 501 if (file_printf(ms, m->desc, buf) == -1) 502 return -1; 503 break; 504 default: 505 if (file_printf(ms, m->desc, vf) == -1) 506 return -1; 507 break; 508 } 509 t = ms->offset + sizeof(float); 510 break; 511 512 case FILE_DOUBLE: 513 case FILE_BEDOUBLE: 514 case FILE_LEDOUBLE: 515 vd = p->d; 516 switch (check_fmt(ms, m)) { 517 case -1: 518 return -1; 519 case 1: 520 (void)snprintf(buf, sizeof(buf), "%g", vd); 521 if (file_printf(ms, m->desc, buf) == -1) 522 return -1; 523 break; 524 default: 525 if (file_printf(ms, m->desc, vd) == -1) 526 return -1; 527 break; 528 } 529 t = ms->offset + sizeof(double); 530 break; 531 532 case FILE_REGEX: { 533 char *cp; 534 int rval; 535 536 cp = strndup((const char *)ms->search.s, ms->search.rm_len); 537 if (cp == NULL) { 538 file_oomem(ms, ms->search.rm_len); 539 return -1; 540 } 541 rval = file_printf(ms, m->desc, cp); 542 free(cp); 543 544 if (rval == -1) 545 return -1; 546 547 if ((m->str_flags & REGEX_OFFSET_START)) 548 t = ms->search.offset; 549 else 550 t = ms->search.offset + ms->search.rm_len; 551 break; 552 } 553 554 case FILE_SEARCH: 555 if (file_printf(ms, m->desc, m->value.s) == -1) 556 return -1; 557 if ((m->str_flags & REGEX_OFFSET_START)) 558 t = ms->search.offset; 559 else 560 t = ms->search.offset + m->vallen; 561 break; 562 563 case FILE_DEFAULT: 564 if (file_printf(ms, m->desc, m->value.s) == -1) 565 return -1; 566 t = ms->offset; 567 break; 568 569 case FILE_INDIRECT: 570 t = ms->offset; 571 break; 572 573 default: 574 file_magerror(ms, "invalid m->type (%d) in mprint()", m->type); 575 return -1; 576 } 577 return (int32_t)t; 578 } 579 580 private int32_t 581 moffset(struct magic_set *ms, struct magic *m) 582 { 583 switch (m->type) { 584 case FILE_BYTE: 585 return CAST(int32_t, (ms->offset + sizeof(char))); 586 587 case FILE_SHORT: 588 case FILE_BESHORT: 589 case FILE_LESHORT: 590 return CAST(int32_t, (ms->offset + sizeof(short))); 591 592 case FILE_LONG: 593 case FILE_BELONG: 594 case FILE_LELONG: 595 case FILE_MELONG: 596 return CAST(int32_t, (ms->offset + sizeof(int32_t))); 597 598 case FILE_QUAD: 599 case FILE_BEQUAD: 600 case FILE_LEQUAD: 601 return CAST(int32_t, (ms->offset + sizeof(int64_t))); 602 603 case FILE_STRING: 604 case FILE_PSTRING: 605 case FILE_BESTRING16: 606 case FILE_LESTRING16: 607 if (m->reln == '=' || m->reln == '!') 608 return ms->offset + m->vallen; 609 else { 610 union VALUETYPE *p = &ms->ms_value; 611 uint32_t t; 612 613 if (*m->value.s == '\0') 614 p->s[strcspn(p->s, "\n")] = '\0'; 615 t = CAST(uint32_t, (ms->offset + strlen(p->s))); 616 if (m->type == FILE_PSTRING) 617 t++; 618 return t; 619 } 620 621 case FILE_DATE: 622 case FILE_BEDATE: 623 case FILE_LEDATE: 624 case FILE_MEDATE: 625 return CAST(int32_t, (ms->offset + sizeof(time_t))); 626 627 case FILE_LDATE: 628 case FILE_BELDATE: 629 case FILE_LELDATE: 630 case FILE_MELDATE: 631 return CAST(int32_t, (ms->offset + sizeof(time_t))); 632 633 case FILE_QDATE: 634 case FILE_BEQDATE: 635 case FILE_LEQDATE: 636 return CAST(int32_t, (ms->offset + sizeof(uint64_t))); 637 638 case FILE_QLDATE: 639 case FILE_BEQLDATE: 640 case FILE_LEQLDATE: 641 return CAST(int32_t, (ms->offset + sizeof(uint64_t))); 642 643 case FILE_FLOAT: 644 case FILE_BEFLOAT: 645 case FILE_LEFLOAT: 646 return CAST(int32_t, (ms->offset + sizeof(float))); 647 648 case FILE_DOUBLE: 649 case FILE_BEDOUBLE: 650 case FILE_LEDOUBLE: 651 return CAST(int32_t, (ms->offset + sizeof(double))); 652 653 case FILE_REGEX: 654 if ((m->str_flags & REGEX_OFFSET_START) != 0) 655 return CAST(int32_t, ms->search.offset); 656 else 657 return CAST(int32_t, (ms->search.offset + 658 ms->search.rm_len)); 659 660 case FILE_SEARCH: 661 if ((m->str_flags & REGEX_OFFSET_START) != 0) 662 return CAST(int32_t, ms->search.offset); 663 else 664 return CAST(int32_t, (ms->search.offset + m->vallen)); 665 666 case FILE_DEFAULT: 667 return ms->offset; 668 669 case FILE_INDIRECT: 670 return ms->offset; 671 672 default: 673 return 0; 674 } 675 } 676 677 #define DO_CVT(fld, cast) \ 678 if (m->num_mask) \ 679 switch (m->mask_op & FILE_OPS_MASK) { \ 680 case FILE_OPAND: \ 681 p->fld &= cast m->num_mask; \ 682 break; \ 683 case FILE_OPOR: \ 684 p->fld |= cast m->num_mask; \ 685 break; \ 686 case FILE_OPXOR: \ 687 p->fld ^= cast m->num_mask; \ 688 break; \ 689 case FILE_OPADD: \ 690 p->fld += cast m->num_mask; \ 691 break; \ 692 case FILE_OPMINUS: \ 693 p->fld -= cast m->num_mask; \ 694 break; \ 695 case FILE_OPMULTIPLY: \ 696 p->fld *= cast m->num_mask; \ 697 break; \ 698 case FILE_OPDIVIDE: \ 699 p->fld /= cast m->num_mask; \ 700 break; \ 701 case FILE_OPMODULO: \ 702 p->fld %= cast m->num_mask; \ 703 break; \ 704 } \ 705 if (m->mask_op & FILE_OPINVERSE) \ 706 p->fld = ~p->fld \ 707 708 private void 709 cvt_8(union VALUETYPE *p, const struct magic *m) 710 { 711 DO_CVT(b, (uint8_t)); 712 } 713 714 private void 715 cvt_16(union VALUETYPE *p, const struct magic *m) 716 { 717 DO_CVT(h, (uint16_t)); 718 } 719 720 private void 721 cvt_32(union VALUETYPE *p, const struct magic *m) 722 { 723 DO_CVT(l, (uint32_t)); 724 } 725 726 private void 727 cvt_64(union VALUETYPE *p, const struct magic *m) 728 { 729 DO_CVT(q, (uint64_t)); 730 } 731 732 #define DO_CVT2(fld, cast) \ 733 if (m->num_mask) \ 734 switch (m->mask_op & FILE_OPS_MASK) { \ 735 case FILE_OPADD: \ 736 p->fld += cast m->num_mask; \ 737 break; \ 738 case FILE_OPMINUS: \ 739 p->fld -= cast m->num_mask; \ 740 break; \ 741 case FILE_OPMULTIPLY: \ 742 p->fld *= cast m->num_mask; \ 743 break; \ 744 case FILE_OPDIVIDE: \ 745 p->fld /= cast m->num_mask; \ 746 break; \ 747 } \ 748 749 private void 750 cvt_float(union VALUETYPE *p, const struct magic *m) 751 { 752 DO_CVT2(f, (float)); 753 } 754 755 private void 756 cvt_double(union VALUETYPE *p, const struct magic *m) 757 { 758 DO_CVT2(d, (double)); 759 } 760 761 /* 762 * Convert the byte order of the data we are looking at 763 * While we're here, let's apply the mask operation 764 * (unless you have a better idea) 765 */ 766 private int 767 mconvert(struct magic_set *ms, struct magic *m) 768 { 769 union VALUETYPE *p = &ms->ms_value; 770 771 switch (m->type) { 772 case FILE_BYTE: 773 cvt_8(p, m); 774 return 1; 775 case FILE_SHORT: 776 cvt_16(p, m); 777 return 1; 778 case FILE_LONG: 779 case FILE_DATE: 780 case FILE_LDATE: 781 cvt_32(p, m); 782 return 1; 783 case FILE_QUAD: 784 case FILE_QDATE: 785 case FILE_QLDATE: 786 cvt_64(p, m); 787 return 1; 788 case FILE_STRING: 789 case FILE_BESTRING16: 790 case FILE_LESTRING16: { 791 /* Null terminate and eat *trailing* return */ 792 p->s[sizeof(p->s) - 1] = '\0'; 793 #if 0 794 /* Why? breaks magic numbers that end with \xa */ 795 len = strlen(p->s); 796 if (len-- && p->s[len] == '\n') 797 p->s[len] = '\0'; 798 #endif 799 return 1; 800 } 801 case FILE_PSTRING: { 802 char *ptr1 = p->s, *ptr2 = ptr1 + 1; 803 size_t len = *p->s; 804 if (len >= sizeof(p->s)) 805 len = sizeof(p->s) - 1; 806 while (len--) 807 *ptr1++ = *ptr2++; 808 *ptr1 = '\0'; 809 #if 0 810 /* Why? breaks magic numbers that end with \xa */ 811 len = strlen(p->s); 812 if (len-- && p->s[len] == '\n') 813 p->s[len] = '\0'; 814 #endif 815 return 1; 816 } 817 case FILE_BESHORT: 818 p->h = (short)((p->hs[0]<<8)|(p->hs[1])); 819 cvt_16(p, m); 820 return 1; 821 case FILE_BELONG: 822 case FILE_BEDATE: 823 case FILE_BELDATE: 824 p->l = (int32_t) 825 ((p->hl[0]<<24)|(p->hl[1]<<16)|(p->hl[2]<<8)|(p->hl[3])); 826 cvt_32(p, m); 827 return 1; 828 case FILE_BEQUAD: 829 case FILE_BEQDATE: 830 case FILE_BEQLDATE: 831 p->q = (uint64_t) 832 (((uint64_t)p->hq[0]<<56)|((uint64_t)p->hq[1]<<48)| 833 ((uint64_t)p->hq[2]<<40)|((uint64_t)p->hq[3]<<32)| 834 ((uint64_t)p->hq[4]<<24)|((uint64_t)p->hq[5]<<16)| 835 ((uint64_t)p->hq[6]<<8)|((uint64_t)p->hq[7])); 836 cvt_64(p, m); 837 return 1; 838 case FILE_LESHORT: 839 p->h = (short)((p->hs[1]<<8)|(p->hs[0])); 840 cvt_16(p, m); 841 return 1; 842 case FILE_LELONG: 843 case FILE_LEDATE: 844 case FILE_LELDATE: 845 p->l = (int32_t) 846 ((p->hl[3]<<24)|(p->hl[2]<<16)|(p->hl[1]<<8)|(p->hl[0])); 847 cvt_32(p, m); 848 return 1; 849 case FILE_LEQUAD: 850 case FILE_LEQDATE: 851 case FILE_LEQLDATE: 852 p->q = (uint64_t) 853 (((uint64_t)p->hq[7]<<56)|((uint64_t)p->hq[6]<<48)| 854 ((uint64_t)p->hq[5]<<40)|((uint64_t)p->hq[4]<<32)| 855 ((uint64_t)p->hq[3]<<24)|((uint64_t)p->hq[2]<<16)| 856 ((uint64_t)p->hq[1]<<8)|((uint64_t)p->hq[0])); 857 cvt_64(p, m); 858 return 1; 859 case FILE_MELONG: 860 case FILE_MEDATE: 861 case FILE_MELDATE: 862 p->l = (int32_t) 863 ((p->hl[1]<<24)|(p->hl[0]<<16)|(p->hl[3]<<8)|(p->hl[2])); 864 cvt_32(p, m); 865 return 1; 866 case FILE_FLOAT: 867 cvt_float(p, m); 868 return 1; 869 case FILE_BEFLOAT: 870 p->l = ((uint32_t)p->hl[0]<<24)|((uint32_t)p->hl[1]<<16)| 871 ((uint32_t)p->hl[2]<<8) |((uint32_t)p->hl[3]); 872 cvt_float(p, m); 873 return 1; 874 case FILE_LEFLOAT: 875 p->l = ((uint32_t)p->hl[3]<<24)|((uint32_t)p->hl[2]<<16)| 876 ((uint32_t)p->hl[1]<<8) |((uint32_t)p->hl[0]); 877 cvt_float(p, m); 878 return 1; 879 case FILE_DOUBLE: 880 cvt_double(p, m); 881 return 1; 882 case FILE_BEDOUBLE: 883 p->q = ((uint64_t)p->hq[0]<<56)|((uint64_t)p->hq[1]<<48)| 884 ((uint64_t)p->hq[2]<<40)|((uint64_t)p->hq[3]<<32)| 885 ((uint64_t)p->hq[4]<<24)|((uint64_t)p->hq[5]<<16)| 886 ((uint64_t)p->hq[6]<<8) |((uint64_t)p->hq[7]); 887 cvt_double(p, m); 888 return 1; 889 case FILE_LEDOUBLE: 890 p->q = ((uint64_t)p->hq[7]<<56)|((uint64_t)p->hq[6]<<48)| 891 ((uint64_t)p->hq[5]<<40)|((uint64_t)p->hq[4]<<32)| 892 ((uint64_t)p->hq[3]<<24)|((uint64_t)p->hq[2]<<16)| 893 ((uint64_t)p->hq[1]<<8) |((uint64_t)p->hq[0]); 894 cvt_double(p, m); 895 return 1; 896 case FILE_REGEX: 897 case FILE_SEARCH: 898 case FILE_DEFAULT: 899 return 1; 900 default: 901 file_magerror(ms, "invalid type %d in mconvert()", m->type); 902 return 0; 903 } 904 } 905 906 907 private void 908 mdebug(uint32_t offset, const char *str, size_t len) 909 { 910 (void) fprintf(stderr, "mget @%d: ", offset); 911 file_showstr(stderr, str, len); 912 (void) fputc('\n', stderr); 913 (void) fputc('\n', stderr); 914 } 915 916 private int 917 mcopy(struct magic_set *ms, union VALUETYPE *p, int type, int indir, 918 const unsigned char *s, uint32_t offset, size_t nbytes, size_t linecnt) 919 { 920 /* 921 * Note: FILE_SEARCH and FILE_REGEX do not actually copy 922 * anything, but setup pointers into the source 923 */ 924 if (indir == 0) { 925 switch (type) { 926 case FILE_SEARCH: 927 ms->search.s = (const char *)s + offset; 928 ms->search.s_len = nbytes - offset; 929 ms->search.offset = offset; 930 return 0; 931 932 case FILE_REGEX: { 933 const char *b; 934 const char *c; 935 const char *last; /* end of search region */ 936 const char *buf; /* start of search region */ 937 const char *end; 938 size_t lines; 939 940 if (s == NULL) { 941 ms->search.s_len = 0; 942 ms->search.s = NULL; 943 return 0; 944 } 945 buf = (const char *)s + offset; 946 end = last = (const char *)s + nbytes; 947 /* mget() guarantees buf <= last */ 948 for (lines = linecnt, b = buf; lines && 949 ((b = CAST(const char *, 950 memchr(c = b, '\n', CAST(size_t, (end - b))))) 951 || (b = CAST(const char *, 952 memchr(c, '\r', CAST(size_t, (end - c)))))); 953 lines--, b++) { 954 last = b; 955 if (b[0] == '\r' && b[1] == '\n') 956 b++; 957 } 958 if (lines) 959 last = (const char *)s + nbytes; 960 961 ms->search.s = buf; 962 ms->search.s_len = last - buf; 963 ms->search.offset = offset; 964 ms->search.rm_len = 0; 965 return 0; 966 } 967 case FILE_BESTRING16: 968 case FILE_LESTRING16: { 969 const unsigned char *src = s + offset; 970 const unsigned char *esrc = s + nbytes; 971 char *dst = p->s; 972 char *edst = &p->s[sizeof(p->s) - 1]; 973 974 if (type == FILE_BESTRING16) 975 src++; 976 977 /* check for pointer overflow */ 978 if (src < s) { 979 file_magerror(ms, "invalid offset %u in mcopy()", 980 offset); 981 return -1; 982 } 983 for (/*EMPTY*/; src < esrc; src += 2, dst++) { 984 if (dst < edst) 985 *dst = *src; 986 else 987 break; 988 if (*dst == '\0') { 989 if (type == FILE_BESTRING16 ? 990 *(src - 1) != '\0' : 991 *(src + 1) != '\0') 992 *dst = ' '; 993 } 994 } 995 *edst = '\0'; 996 return 0; 997 } 998 case FILE_STRING: /* XXX - these two should not need */ 999 case FILE_PSTRING: /* to copy anything, but do anyway. */ 1000 default: 1001 break; 1002 } 1003 } 1004 1005 if (offset >= nbytes) { 1006 (void)memset(p, '\0', sizeof(*p)); 1007 return 0; 1008 } 1009 if (nbytes - offset < sizeof(*p)) 1010 nbytes = nbytes - offset; 1011 else 1012 nbytes = sizeof(*p); 1013 1014 (void)memcpy(p, s + offset, nbytes); 1015 1016 /* 1017 * the usefulness of padding with zeroes eludes me, it 1018 * might even cause problems 1019 */ 1020 if (nbytes < sizeof(*p)) 1021 (void)memset(((char *)(void *)p) + nbytes, '\0', 1022 sizeof(*p) - nbytes); 1023 return 0; 1024 } 1025 1026 private int 1027 mget(struct magic_set *ms, const unsigned char *s, 1028 struct magic *m, size_t nbytes, unsigned int cont_level) 1029 { 1030 uint32_t offset = ms->offset; 1031 uint32_t count = m->str_range; 1032 union VALUETYPE *p = &ms->ms_value; 1033 1034 if (mcopy(ms, p, m->type, m->flag & INDIR, s, offset, nbytes, count) == -1) 1035 return -1; 1036 1037 if ((ms->flags & MAGIC_DEBUG) != 0) { 1038 mdebug(offset, (char *)(void *)p, sizeof(union VALUETYPE)); 1039 #ifndef COMPILE_ONLY 1040 file_mdump(m); 1041 #endif 1042 } 1043 1044 if (m->flag & INDIR) { 1045 int off = m->in_offset; 1046 if (m->in_op & FILE_OPINDIRECT) { 1047 const union VALUETYPE *q = CAST(const union VALUETYPE *, 1048 ((const void *)(s + offset + off))); 1049 switch (m->in_type) { 1050 case FILE_BYTE: 1051 off = q->b; 1052 break; 1053 case FILE_SHORT: 1054 off = q->h; 1055 break; 1056 case FILE_BESHORT: 1057 off = (short)((q->hs[0]<<8)|(q->hs[1])); 1058 break; 1059 case FILE_LESHORT: 1060 off = (short)((q->hs[1]<<8)|(q->hs[0])); 1061 break; 1062 case FILE_LONG: 1063 off = q->l; 1064 break; 1065 case FILE_BELONG: 1066 case FILE_BEID3: 1067 off = (int32_t)((q->hl[0]<<24)|(q->hl[1]<<16)| 1068 (q->hl[2]<<8)|(q->hl[3])); 1069 break; 1070 case FILE_LEID3: 1071 case FILE_LELONG: 1072 off = (int32_t)((q->hl[3]<<24)|(q->hl[2]<<16)| 1073 (q->hl[1]<<8)|(q->hl[0])); 1074 break; 1075 case FILE_MELONG: 1076 off = (int32_t)((q->hl[1]<<24)|(q->hl[0]<<16)| 1077 (q->hl[3]<<8)|(q->hl[2])); 1078 break; 1079 } 1080 } 1081 switch (m->in_type) { 1082 case FILE_BYTE: 1083 if (nbytes < (offset + 1)) 1084 return 0; 1085 if (off) { 1086 switch (m->in_op & FILE_OPS_MASK) { 1087 case FILE_OPAND: 1088 offset = p->b & off; 1089 break; 1090 case FILE_OPOR: 1091 offset = p->b | off; 1092 break; 1093 case FILE_OPXOR: 1094 offset = p->b ^ off; 1095 break; 1096 case FILE_OPADD: 1097 offset = p->b + off; 1098 break; 1099 case FILE_OPMINUS: 1100 offset = p->b - off; 1101 break; 1102 case FILE_OPMULTIPLY: 1103 offset = p->b * off; 1104 break; 1105 case FILE_OPDIVIDE: 1106 offset = p->b / off; 1107 break; 1108 case FILE_OPMODULO: 1109 offset = p->b % off; 1110 break; 1111 } 1112 } else 1113 offset = p->b; 1114 if (m->in_op & FILE_OPINVERSE) 1115 offset = ~offset; 1116 break; 1117 case FILE_BESHORT: 1118 if (nbytes < (offset + 2)) 1119 return 0; 1120 if (off) { 1121 switch (m->in_op & FILE_OPS_MASK) { 1122 case FILE_OPAND: 1123 offset = (short)((p->hs[0]<<8)| 1124 (p->hs[1])) & 1125 off; 1126 break; 1127 case FILE_OPOR: 1128 offset = (short)((p->hs[0]<<8)| 1129 (p->hs[1])) | 1130 off; 1131 break; 1132 case FILE_OPXOR: 1133 offset = (short)((p->hs[0]<<8)| 1134 (p->hs[1])) ^ 1135 off; 1136 break; 1137 case FILE_OPADD: 1138 offset = (short)((p->hs[0]<<8)| 1139 (p->hs[1])) + 1140 off; 1141 break; 1142 case FILE_OPMINUS: 1143 offset = (short)((p->hs[0]<<8)| 1144 (p->hs[1])) - 1145 off; 1146 break; 1147 case FILE_OPMULTIPLY: 1148 offset = (short)((p->hs[0]<<8)| 1149 (p->hs[1])) * 1150 off; 1151 break; 1152 case FILE_OPDIVIDE: 1153 offset = (short)((p->hs[0]<<8)| 1154 (p->hs[1])) / 1155 off; 1156 break; 1157 case FILE_OPMODULO: 1158 offset = (short)((p->hs[0]<<8)| 1159 (p->hs[1])) % 1160 off; 1161 break; 1162 } 1163 } else 1164 offset = (short)((p->hs[0]<<8)| 1165 (p->hs[1])); 1166 if (m->in_op & FILE_OPINVERSE) 1167 offset = ~offset; 1168 break; 1169 case FILE_LESHORT: 1170 if (nbytes < (offset + 2)) 1171 return 0; 1172 if (off) { 1173 switch (m->in_op & FILE_OPS_MASK) { 1174 case FILE_OPAND: 1175 offset = (short)((p->hs[1]<<8)| 1176 (p->hs[0])) & 1177 off; 1178 break; 1179 case FILE_OPOR: 1180 offset = (short)((p->hs[1]<<8)| 1181 (p->hs[0])) | 1182 off; 1183 break; 1184 case FILE_OPXOR: 1185 offset = (short)((p->hs[1]<<8)| 1186 (p->hs[0])) ^ 1187 off; 1188 break; 1189 case FILE_OPADD: 1190 offset = (short)((p->hs[1]<<8)| 1191 (p->hs[0])) + 1192 off; 1193 break; 1194 case FILE_OPMINUS: 1195 offset = (short)((p->hs[1]<<8)| 1196 (p->hs[0])) - 1197 off; 1198 break; 1199 case FILE_OPMULTIPLY: 1200 offset = (short)((p->hs[1]<<8)| 1201 (p->hs[0])) * 1202 off; 1203 break; 1204 case FILE_OPDIVIDE: 1205 offset = (short)((p->hs[1]<<8)| 1206 (p->hs[0])) / 1207 off; 1208 break; 1209 case FILE_OPMODULO: 1210 offset = (short)((p->hs[1]<<8)| 1211 (p->hs[0])) % 1212 off; 1213 break; 1214 } 1215 } else 1216 offset = (short)((p->hs[1]<<8)| 1217 (p->hs[0])); 1218 if (m->in_op & FILE_OPINVERSE) 1219 offset = ~offset; 1220 break; 1221 case FILE_SHORT: 1222 if (nbytes < (offset + 2)) 1223 return 0; 1224 if (off) { 1225 switch (m->in_op & FILE_OPS_MASK) { 1226 case FILE_OPAND: 1227 offset = p->h & off; 1228 break; 1229 case FILE_OPOR: 1230 offset = p->h | off; 1231 break; 1232 case FILE_OPXOR: 1233 offset = p->h ^ off; 1234 break; 1235 case FILE_OPADD: 1236 offset = p->h + off; 1237 break; 1238 case FILE_OPMINUS: 1239 offset = p->h - off; 1240 break; 1241 case FILE_OPMULTIPLY: 1242 offset = p->h * off; 1243 break; 1244 case FILE_OPDIVIDE: 1245 offset = p->h / off; 1246 break; 1247 case FILE_OPMODULO: 1248 offset = p->h % off; 1249 break; 1250 } 1251 } 1252 else 1253 offset = p->h; 1254 if (m->in_op & FILE_OPINVERSE) 1255 offset = ~offset; 1256 break; 1257 case FILE_BELONG: 1258 case FILE_BEID3: 1259 if (nbytes < (offset + 4)) 1260 return 0; 1261 if (off) { 1262 switch (m->in_op & FILE_OPS_MASK) { 1263 case FILE_OPAND: 1264 offset = (int32_t)((p->hl[0]<<24)| 1265 (p->hl[1]<<16)| 1266 (p->hl[2]<<8)| 1267 (p->hl[3])) & 1268 off; 1269 break; 1270 case FILE_OPOR: 1271 offset = (int32_t)((p->hl[0]<<24)| 1272 (p->hl[1]<<16)| 1273 (p->hl[2]<<8)| 1274 (p->hl[3])) | 1275 off; 1276 break; 1277 case FILE_OPXOR: 1278 offset = (int32_t)((p->hl[0]<<24)| 1279 (p->hl[1]<<16)| 1280 (p->hl[2]<<8)| 1281 (p->hl[3])) ^ 1282 off; 1283 break; 1284 case FILE_OPADD: 1285 offset = (int32_t)((p->hl[0]<<24)| 1286 (p->hl[1]<<16)| 1287 (p->hl[2]<<8)| 1288 (p->hl[3])) + 1289 off; 1290 break; 1291 case FILE_OPMINUS: 1292 offset = (int32_t)((p->hl[0]<<24)| 1293 (p->hl[1]<<16)| 1294 (p->hl[2]<<8)| 1295 (p->hl[3])) - 1296 off; 1297 break; 1298 case FILE_OPMULTIPLY: 1299 offset = (int32_t)((p->hl[0]<<24)| 1300 (p->hl[1]<<16)| 1301 (p->hl[2]<<8)| 1302 (p->hl[3])) * 1303 off; 1304 break; 1305 case FILE_OPDIVIDE: 1306 offset = (int32_t)((p->hl[0]<<24)| 1307 (p->hl[1]<<16)| 1308 (p->hl[2]<<8)| 1309 (p->hl[3])) / 1310 off; 1311 break; 1312 case FILE_OPMODULO: 1313 offset = (int32_t)((p->hl[0]<<24)| 1314 (p->hl[1]<<16)| 1315 (p->hl[2]<<8)| 1316 (p->hl[3])) % 1317 off; 1318 break; 1319 } 1320 } else 1321 offset = (int32_t)((p->hl[0]<<24)| 1322 (p->hl[1]<<16)| 1323 (p->hl[2]<<8)| 1324 (p->hl[3])); 1325 if (m->in_op & FILE_OPINVERSE) 1326 offset = ~offset; 1327 break; 1328 case FILE_LELONG: 1329 case FILE_LEID3: 1330 if (nbytes < (offset + 4)) 1331 return 0; 1332 if (off) { 1333 switch (m->in_op & FILE_OPS_MASK) { 1334 case FILE_OPAND: 1335 offset = (int32_t)((p->hl[3]<<24)| 1336 (p->hl[2]<<16)| 1337 (p->hl[1]<<8)| 1338 (p->hl[0])) & 1339 off; 1340 break; 1341 case FILE_OPOR: 1342 offset = (int32_t)((p->hl[3]<<24)| 1343 (p->hl[2]<<16)| 1344 (p->hl[1]<<8)| 1345 (p->hl[0])) | 1346 off; 1347 break; 1348 case FILE_OPXOR: 1349 offset = (int32_t)((p->hl[3]<<24)| 1350 (p->hl[2]<<16)| 1351 (p->hl[1]<<8)| 1352 (p->hl[0])) ^ 1353 off; 1354 break; 1355 case FILE_OPADD: 1356 offset = (int32_t)((p->hl[3]<<24)| 1357 (p->hl[2]<<16)| 1358 (p->hl[1]<<8)| 1359 (p->hl[0])) + 1360 off; 1361 break; 1362 case FILE_OPMINUS: 1363 offset = (int32_t)((p->hl[3]<<24)| 1364 (p->hl[2]<<16)| 1365 (p->hl[1]<<8)| 1366 (p->hl[0])) - 1367 off; 1368 break; 1369 case FILE_OPMULTIPLY: 1370 offset = (int32_t)((p->hl[3]<<24)| 1371 (p->hl[2]<<16)| 1372 (p->hl[1]<<8)| 1373 (p->hl[0])) * 1374 off; 1375 break; 1376 case FILE_OPDIVIDE: 1377 offset = (int32_t)((p->hl[3]<<24)| 1378 (p->hl[2]<<16)| 1379 (p->hl[1]<<8)| 1380 (p->hl[0])) / 1381 off; 1382 break; 1383 case FILE_OPMODULO: 1384 offset = (int32_t)((p->hl[3]<<24)| 1385 (p->hl[2]<<16)| 1386 (p->hl[1]<<8)| 1387 (p->hl[0])) % 1388 off; 1389 break; 1390 } 1391 } else 1392 offset = (int32_t)((p->hl[3]<<24)| 1393 (p->hl[2]<<16)| 1394 (p->hl[1]<<8)| 1395 (p->hl[0])); 1396 if (m->in_op & FILE_OPINVERSE) 1397 offset = ~offset; 1398 break; 1399 case FILE_MELONG: 1400 if (nbytes < (offset + 4)) 1401 return 0; 1402 if (off) { 1403 switch (m->in_op & FILE_OPS_MASK) { 1404 case FILE_OPAND: 1405 offset = (int32_t)((p->hl[1]<<24)| 1406 (p->hl[0]<<16)| 1407 (p->hl[3]<<8)| 1408 (p->hl[2])) & 1409 off; 1410 break; 1411 case FILE_OPOR: 1412 offset = (int32_t)((p->hl[1]<<24)| 1413 (p->hl[0]<<16)| 1414 (p->hl[3]<<8)| 1415 (p->hl[2])) | 1416 off; 1417 break; 1418 case FILE_OPXOR: 1419 offset = (int32_t)((p->hl[1]<<24)| 1420 (p->hl[0]<<16)| 1421 (p->hl[3]<<8)| 1422 (p->hl[2])) ^ 1423 off; 1424 break; 1425 case FILE_OPADD: 1426 offset = (int32_t)((p->hl[1]<<24)| 1427 (p->hl[0]<<16)| 1428 (p->hl[3]<<8)| 1429 (p->hl[2])) + 1430 off; 1431 break; 1432 case FILE_OPMINUS: 1433 offset = (int32_t)((p->hl[1]<<24)| 1434 (p->hl[0]<<16)| 1435 (p->hl[3]<<8)| 1436 (p->hl[2])) - 1437 off; 1438 break; 1439 case FILE_OPMULTIPLY: 1440 offset = (int32_t)((p->hl[1]<<24)| 1441 (p->hl[0]<<16)| 1442 (p->hl[3]<<8)| 1443 (p->hl[2])) * 1444 off; 1445 break; 1446 case FILE_OPDIVIDE: 1447 offset = (int32_t)((p->hl[1]<<24)| 1448 (p->hl[0]<<16)| 1449 (p->hl[3]<<8)| 1450 (p->hl[2])) / 1451 off; 1452 break; 1453 case FILE_OPMODULO: 1454 offset = (int32_t)((p->hl[1]<<24)| 1455 (p->hl[0]<<16)| 1456 (p->hl[3]<<8)| 1457 (p->hl[2])) % 1458 off; 1459 break; 1460 } 1461 } else 1462 offset = (int32_t)((p->hl[1]<<24)| 1463 (p->hl[0]<<16)| 1464 (p->hl[3]<<8)| 1465 (p->hl[2])); 1466 if (m->in_op & FILE_OPINVERSE) 1467 offset = ~offset; 1468 break; 1469 case FILE_LONG: 1470 if (nbytes < (offset + 4)) 1471 return 0; 1472 if (off) { 1473 switch (m->in_op & FILE_OPS_MASK) { 1474 case FILE_OPAND: 1475 offset = p->l & off; 1476 break; 1477 case FILE_OPOR: 1478 offset = p->l | off; 1479 break; 1480 case FILE_OPXOR: 1481 offset = p->l ^ off; 1482 break; 1483 case FILE_OPADD: 1484 offset = p->l + off; 1485 break; 1486 case FILE_OPMINUS: 1487 offset = p->l - off; 1488 break; 1489 case FILE_OPMULTIPLY: 1490 offset = p->l * off; 1491 break; 1492 case FILE_OPDIVIDE: 1493 offset = p->l / off; 1494 break; 1495 case FILE_OPMODULO: 1496 offset = p->l % off; 1497 break; 1498 } 1499 } else 1500 offset = p->l; 1501 if (m->in_op & FILE_OPINVERSE) 1502 offset = ~offset; 1503 break; 1504 } 1505 1506 switch (m->in_type) { 1507 case FILE_LEID3: 1508 case FILE_BEID3: 1509 offset = ((((offset >> 0) & 0x7f) << 0) | 1510 (((offset >> 8) & 0x7f) << 7) | 1511 (((offset >> 16) & 0x7f) << 14) | 1512 (((offset >> 24) & 0x7f) << 21)) + 10; 1513 break; 1514 default: 1515 break; 1516 } 1517 1518 if (m->flag & INDIROFFADD) { 1519 offset += ms->c.li[cont_level-1].off; 1520 } 1521 if (mcopy(ms, p, m->type, 0, s, offset, nbytes, count) == -1) 1522 return -1; 1523 ms->offset = offset; 1524 1525 if ((ms->flags & MAGIC_DEBUG) != 0) { 1526 mdebug(offset, (char *)(void *)p, 1527 sizeof(union VALUETYPE)); 1528 #ifndef COMPILE_ONLY 1529 file_mdump(m); 1530 #endif 1531 } 1532 } 1533 1534 /* Verify we have enough data to match magic type */ 1535 switch (m->type) { 1536 case FILE_BYTE: 1537 if (nbytes < (offset + 1)) /* should alway be true */ 1538 return 0; 1539 break; 1540 1541 case FILE_SHORT: 1542 case FILE_BESHORT: 1543 case FILE_LESHORT: 1544 if (nbytes < (offset + 2)) 1545 return 0; 1546 break; 1547 1548 case FILE_LONG: 1549 case FILE_BELONG: 1550 case FILE_LELONG: 1551 case FILE_MELONG: 1552 case FILE_DATE: 1553 case FILE_BEDATE: 1554 case FILE_LEDATE: 1555 case FILE_MEDATE: 1556 case FILE_LDATE: 1557 case FILE_BELDATE: 1558 case FILE_LELDATE: 1559 case FILE_MELDATE: 1560 case FILE_FLOAT: 1561 case FILE_BEFLOAT: 1562 case FILE_LEFLOAT: 1563 if (nbytes < (offset + 4)) 1564 return 0; 1565 break; 1566 1567 case FILE_DOUBLE: 1568 case FILE_BEDOUBLE: 1569 case FILE_LEDOUBLE: 1570 if (nbytes < (offset + 8)) 1571 return 0; 1572 break; 1573 1574 case FILE_STRING: 1575 case FILE_PSTRING: 1576 case FILE_SEARCH: 1577 if (nbytes < (offset + m->vallen)) 1578 return 0; 1579 break; 1580 1581 case FILE_REGEX: 1582 if (nbytes < offset) 1583 return 0; 1584 break; 1585 1586 case FILE_INDIRECT: 1587 if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 && 1588 file_printf(ms, m->desc) == -1) 1589 return -1; 1590 if (nbytes < offset) 1591 return 0; 1592 return file_softmagic(ms, s + offset, nbytes - offset, 1593 BINTEST); 1594 1595 case FILE_DEFAULT: /* nothing to check */ 1596 default: 1597 break; 1598 } 1599 if (!mconvert(ms, m)) 1600 return 0; 1601 return 1; 1602 } 1603 1604 private uint64_t 1605 file_strncmp(const char *s1, const char *s2, size_t len, uint32_t flags) 1606 { 1607 /* 1608 * Convert the source args to unsigned here so that (1) the 1609 * compare will be unsigned as it is in strncmp() and (2) so 1610 * the ctype functions will work correctly without extra 1611 * casting. 1612 */ 1613 const unsigned char *a = (const unsigned char *)s1; 1614 const unsigned char *b = (const unsigned char *)s2; 1615 uint64_t v; 1616 1617 /* 1618 * What we want here is v = strncmp(s1, s2, len), 1619 * but ignoring any nulls. 1620 */ 1621 v = 0; 1622 if (0L == flags) { /* normal string: do it fast */ 1623 while (len-- > 0) 1624 if ((v = *b++ - *a++) != '\0') 1625 break; 1626 } 1627 else { /* combine the others */ 1628 while (len-- > 0) { 1629 if ((flags & STRING_IGNORE_LOWERCASE) && 1630 islower(*a)) { 1631 if ((v = tolower(*b++) - *a++) != '\0') 1632 break; 1633 } 1634 else if ((flags & STRING_IGNORE_UPPERCASE) && 1635 isupper(*a)) { 1636 if ((v = toupper(*b++) - *a++) != '\0') 1637 break; 1638 } 1639 else if ((flags & STRING_COMPACT_WHITESPACE) && 1640 isspace(*a)) { 1641 a++; 1642 if (isspace(*b++)) { 1643 while (isspace(*b)) 1644 b++; 1645 } 1646 else { 1647 v = 1; 1648 break; 1649 } 1650 } 1651 else if ((flags & STRING_COMPACT_OPTIONAL_WHITESPACE) && 1652 isspace(*a)) { 1653 a++; 1654 while (isspace(*b)) 1655 b++; 1656 } 1657 else { 1658 if ((v = *b++ - *a++) != '\0') 1659 break; 1660 } 1661 } 1662 } 1663 return v; 1664 } 1665 1666 private uint64_t 1667 file_strncmp16(const char *a, const char *b, size_t len, uint32_t flags) 1668 { 1669 /* 1670 * XXX - The 16-bit string compare probably needs to be done 1671 * differently, especially if the flags are to be supported. 1672 * At the moment, I am unsure. 1673 */ 1674 flags = 0; 1675 return file_strncmp(a, b, len, flags); 1676 } 1677 1678 private int 1679 magiccheck(struct magic_set *ms, struct magic *m) 1680 { 1681 uint64_t l = m->value.q; 1682 uint64_t v; 1683 float fl, fv; 1684 double dl, dv; 1685 int matched; 1686 union VALUETYPE *p = &ms->ms_value; 1687 1688 switch (m->type) { 1689 case FILE_BYTE: 1690 v = p->b; 1691 break; 1692 1693 case FILE_SHORT: 1694 case FILE_BESHORT: 1695 case FILE_LESHORT: 1696 v = p->h; 1697 break; 1698 1699 case FILE_LONG: 1700 case FILE_BELONG: 1701 case FILE_LELONG: 1702 case FILE_MELONG: 1703 case FILE_DATE: 1704 case FILE_BEDATE: 1705 case FILE_LEDATE: 1706 case FILE_MEDATE: 1707 case FILE_LDATE: 1708 case FILE_BELDATE: 1709 case FILE_LELDATE: 1710 case FILE_MELDATE: 1711 v = p->l; 1712 break; 1713 1714 case FILE_QUAD: 1715 case FILE_LEQUAD: 1716 case FILE_BEQUAD: 1717 case FILE_QDATE: 1718 case FILE_BEQDATE: 1719 case FILE_LEQDATE: 1720 case FILE_QLDATE: 1721 case FILE_BEQLDATE: 1722 case FILE_LEQLDATE: 1723 v = p->q; 1724 break; 1725 1726 case FILE_FLOAT: 1727 case FILE_BEFLOAT: 1728 case FILE_LEFLOAT: 1729 fl = m->value.f; 1730 fv = p->f; 1731 switch (m->reln) { 1732 case 'x': 1733 matched = 1; 1734 break; 1735 1736 case '!': 1737 matched = fv != fl; 1738 break; 1739 1740 case '=': 1741 matched = fv == fl; 1742 break; 1743 1744 case '>': 1745 matched = fv > fl; 1746 break; 1747 1748 case '<': 1749 matched = fv < fl; 1750 break; 1751 1752 default: 1753 matched = 0; 1754 file_magerror(ms, "cannot happen with float: invalid relation `%c'", 1755 m->reln); 1756 return -1; 1757 } 1758 return matched; 1759 1760 case FILE_DOUBLE: 1761 case FILE_BEDOUBLE: 1762 case FILE_LEDOUBLE: 1763 dl = m->value.d; 1764 dv = p->d; 1765 switch (m->reln) { 1766 case 'x': 1767 matched = 1; 1768 break; 1769 1770 case '!': 1771 matched = dv != dl; 1772 break; 1773 1774 case '=': 1775 matched = dv == dl; 1776 break; 1777 1778 case '>': 1779 matched = dv > dl; 1780 break; 1781 1782 case '<': 1783 matched = dv < dl; 1784 break; 1785 1786 default: 1787 matched = 0; 1788 file_magerror(ms, "cannot happen with double: invalid relation `%c'", m->reln); 1789 return -1; 1790 } 1791 return matched; 1792 1793 case FILE_DEFAULT: 1794 l = 0; 1795 v = 0; 1796 break; 1797 1798 case FILE_STRING: 1799 case FILE_PSTRING: 1800 l = 0; 1801 v = file_strncmp(m->value.s, p->s, (size_t)m->vallen, m->str_flags); 1802 break; 1803 1804 case FILE_BESTRING16: 1805 case FILE_LESTRING16: 1806 l = 0; 1807 v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen, m->str_flags); 1808 break; 1809 1810 case FILE_SEARCH: { /* search ms->search.s for the string m->value.s */ 1811 size_t slen; 1812 size_t idx; 1813 1814 if (ms->search.s == NULL) 1815 return 0; 1816 1817 slen = MIN(m->vallen, sizeof(m->value.s)); 1818 l = 0; 1819 v = 0; 1820 1821 for (idx = 0; m->str_range == 0 || idx < m->str_range; idx++) { 1822 if (slen + idx > ms->search.s_len) 1823 break; 1824 1825 v = file_strncmp(m->value.s, ms->search.s + idx, slen, m->str_flags); 1826 if (v == 0) { /* found match */ 1827 ms->search.offset += idx; 1828 break; 1829 } 1830 } 1831 break; 1832 } 1833 case FILE_REGEX: { 1834 int rc; 1835 regex_t rx; 1836 char errmsg[512]; 1837 1838 if (ms->search.s == NULL) 1839 return 0; 1840 1841 l = 0; 1842 rc = regcomp(&rx, m->value.s, 1843 REG_EXTENDED|REG_NEWLINE| 1844 ((m->str_flags & STRING_IGNORE_CASE) ? REG_ICASE : 0)); 1845 if (rc) { 1846 (void)regerror(rc, &rx, errmsg, sizeof(errmsg)); 1847 file_magerror(ms, "regex error %d, (%s)", 1848 rc, errmsg); 1849 v = (uint64_t)-1; 1850 } 1851 else { 1852 regmatch_t pmatch[1]; 1853 #ifndef REG_STARTEND 1854 #define REG_STARTEND 0 1855 size_t l = ms->search.s_len - 1; 1856 char c = ms->search.s[l]; 1857 ((char *)(intptr_t)ms->search.s)[l] = '\0'; 1858 #else 1859 pmatch[0].rm_so = 0; 1860 pmatch[0].rm_eo = ms->search.s_len; 1861 #endif 1862 rc = regexec(&rx, (const char *)ms->search.s, 1863 1, pmatch, REG_STARTEND); 1864 #if REG_STARTEND == 0 1865 ((char *)(intptr_t)ms->search.s)[l] = c; 1866 #endif 1867 switch (rc) { 1868 case 0: 1869 ms->search.s += (int)pmatch[0].rm_so; 1870 ms->search.offset += (size_t)pmatch[0].rm_so; 1871 ms->search.rm_len = 1872 (size_t)(pmatch[0].rm_eo - pmatch[0].rm_so); 1873 v = 0; 1874 break; 1875 1876 case REG_NOMATCH: 1877 v = 1; 1878 break; 1879 1880 default: 1881 (void)regerror(rc, &rx, errmsg, sizeof(errmsg)); 1882 file_magerror(ms, "regexec error %d, (%s)", 1883 rc, errmsg); 1884 v = (uint64_t)-1; 1885 break; 1886 } 1887 regfree(&rx); 1888 } 1889 if (v == (uint64_t)-1) 1890 return -1; 1891 break; 1892 } 1893 case FILE_INDIRECT: 1894 return 1; 1895 default: 1896 file_magerror(ms, "invalid type %d in magiccheck()", m->type); 1897 return -1; 1898 } 1899 1900 v = file_signextend(ms, m, v); 1901 1902 switch (m->reln) { 1903 case 'x': 1904 if ((ms->flags & MAGIC_DEBUG) != 0) 1905 (void) fprintf(stderr, "%llu == *any* = 1\n", 1906 (unsigned long long)v); 1907 matched = 1; 1908 break; 1909 1910 case '!': 1911 matched = v != l; 1912 if ((ms->flags & MAGIC_DEBUG) != 0) 1913 (void) fprintf(stderr, "%llu != %llu = %d\n", 1914 (unsigned long long)v, (unsigned long long)l, 1915 matched); 1916 break; 1917 1918 case '=': 1919 matched = v == l; 1920 if ((ms->flags & MAGIC_DEBUG) != 0) 1921 (void) fprintf(stderr, "%llu == %llu = %d\n", 1922 (unsigned long long)v, (unsigned long long)l, 1923 matched); 1924 break; 1925 1926 case '>': 1927 if (m->flag & UNSIGNED) { 1928 matched = v > l; 1929 if ((ms->flags & MAGIC_DEBUG) != 0) 1930 (void) fprintf(stderr, "%llu > %llu = %d\n", 1931 (unsigned long long)v, 1932 (unsigned long long)l, matched); 1933 } 1934 else { 1935 matched = (int64_t) v > (int64_t) l; 1936 if ((ms->flags & MAGIC_DEBUG) != 0) 1937 (void) fprintf(stderr, "%lld > %lld = %d\n", 1938 (long long)v, (long long)l, matched); 1939 } 1940 break; 1941 1942 case '<': 1943 if (m->flag & UNSIGNED) { 1944 matched = v < l; 1945 if ((ms->flags & MAGIC_DEBUG) != 0) 1946 (void) fprintf(stderr, "%llu < %llu = %d\n", 1947 (unsigned long long)v, 1948 (unsigned long long)l, matched); 1949 } 1950 else { 1951 matched = (int64_t) v < (int64_t) l; 1952 if ((ms->flags & MAGIC_DEBUG) != 0) 1953 (void) fprintf(stderr, "%lld < %lld = %d\n", 1954 (long long)v, (long long)l, matched); 1955 } 1956 break; 1957 1958 case '&': 1959 matched = (v & l) == l; 1960 if ((ms->flags & MAGIC_DEBUG) != 0) 1961 (void) fprintf(stderr, "((%llx & %llx) == %llx) = %d\n", 1962 (unsigned long long)v, (unsigned long long)l, 1963 (unsigned long long)l, matched); 1964 break; 1965 1966 case '^': 1967 matched = (v & l) != l; 1968 if ((ms->flags & MAGIC_DEBUG) != 0) 1969 (void) fprintf(stderr, "((%llx & %llx) != %llx) = %d\n", 1970 (unsigned long long)v, (unsigned long long)l, 1971 (unsigned long long)l, matched); 1972 break; 1973 1974 default: 1975 matched = 0; 1976 file_magerror(ms, "cannot happen: invalid relation `%c'", 1977 m->reln); 1978 return -1; 1979 } 1980 1981 return matched; 1982 } 1983 1984 private int 1985 handle_annotation(struct magic_set *ms, struct magic *m) 1986 { 1987 if (ms->flags & MAGIC_APPLE) { 1988 if (file_printf(ms, "%.8s", m->apple) == -1) 1989 return -1; 1990 return 1; 1991 } 1992 if ((ms->flags & MAGIC_MIME_TYPE) && m->mimetype[0]) { 1993 if (file_printf(ms, "%s", m->mimetype) == -1) 1994 return -1; 1995 return 1; 1996 } 1997 return 0; 1998 } 1999 2000 private int 2001 print_sep(struct magic_set *ms, int firstline) 2002 { 2003 if (ms->flags & MAGIC_MIME) 2004 return 0; 2005 if (firstline) 2006 return 0; 2007 /* 2008 * we found another match 2009 * put a newline and '-' to do some simple formatting 2010 */ 2011 return file_printf(ms, "\n- "); 2012 } 2013