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 * file - find type of a file or files - main program. 30 */ 31 32 #include "file.h" 33 34 #ifndef lint 35 FILE_RCSID("@(#)$File: file.c,v 1.167 2015/09/11 17:24:09 christos Exp $") 36 #endif /* lint */ 37 38 #include "magic.h" 39 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <string.h> 43 #ifdef RESTORE_TIME 44 # if (__COHERENT__ >= 0x420) 45 # include <sys/utime.h> 46 # else 47 # ifdef USE_UTIMES 48 # include <sys/time.h> 49 # else 50 # include <utime.h> 51 # endif 52 # endif 53 #endif 54 #ifdef HAVE_UNISTD_H 55 #include <unistd.h> /* for read() */ 56 #endif 57 #ifdef HAVE_WCHAR_H 58 #include <wchar.h> 59 #endif 60 61 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION) 62 #include <getopt.h> 63 #ifndef HAVE_GETOPT_LONG 64 int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex); 65 #endif 66 #else 67 #include "mygetopt.h" 68 #endif 69 70 #ifdef S_IFLNK 71 #define FILE_FLAGS "-bcEhikLlNnprsvzZ0" 72 #else 73 #define FILE_FLAGS "-bcEiklNnprsvzZ0" 74 #endif 75 76 # define USAGE \ 77 "Usage: %s [" FILE_FLAGS \ 78 "] [--apple] [--extension] [--mime-encoding] [--mime-type]\n" \ 79 " [-e testname] [-F separator] [-f namefile] [-m magicfiles] " \ 80 "file ...\n" \ 81 " %s -C [-m magicfiles]\n" \ 82 " %s [--help]\n" 83 84 private int /* Global command-line options */ 85 bflag = 0, /* brief output format */ 86 nopad = 0, /* Don't pad output */ 87 nobuffer = 0, /* Do not buffer stdout */ 88 nulsep = 0; /* Append '\0' to the separator */ 89 90 private const char *separator = ":"; /* Default field separator */ 91 private const struct option long_options[] = { 92 #define OPT_HELP 1 93 #define OPT_APPLE 2 94 #define OPT_EXTENSIONS 3 95 #define OPT_MIME_TYPE 4 96 #define OPT_MIME_ENCODING 5 97 #define OPT(shortname, longname, opt, doc) \ 98 {longname, opt, NULL, shortname}, 99 #define OPT_LONGONLY(longname, opt, doc, id) \ 100 {longname, opt, NULL, id}, 101 #include "file_opts.h" 102 #undef OPT 103 #undef OPT_LONGONLY 104 {0, 0, NULL, 0} 105 }; 106 #define OPTSTRING "bcCde:Ef:F:hiklLm:nNpP:rsvzZ0" 107 108 private const struct { 109 const char *name; 110 int value; 111 } nv[] = { 112 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 113 { "ascii", MAGIC_NO_CHECK_ASCII }, 114 { "cdf", MAGIC_NO_CHECK_CDF }, 115 { "compress", MAGIC_NO_CHECK_COMPRESS }, 116 { "elf", MAGIC_NO_CHECK_ELF }, 117 { "encoding", MAGIC_NO_CHECK_ENCODING }, 118 { "soft", MAGIC_NO_CHECK_SOFT }, 119 { "tar", MAGIC_NO_CHECK_TAR }, 120 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */ 121 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */ 122 }; 123 124 private struct { 125 const char *name; 126 int tag; 127 size_t value; 128 } pm[] = { 129 { "indir", MAGIC_PARAM_INDIR_MAX, 0 }, 130 { "name", MAGIC_PARAM_NAME_MAX, 0 }, 131 { "elf_phnum", MAGIC_PARAM_ELF_PHNUM_MAX, 0 }, 132 { "elf_shnum", MAGIC_PARAM_ELF_SHNUM_MAX, 0 }, 133 { "elf_notes", MAGIC_PARAM_ELF_NOTES_MAX, 0 }, 134 { "regex", MAGIC_PARAM_REGEX_MAX, 0 }, 135 }; 136 137 private char *progname; /* used throughout */ 138 139 #ifdef __dead 140 __dead 141 #endif 142 private void usage(void); 143 private void docprint(const char *); 144 #ifdef __dead 145 __dead 146 #endif 147 private void help(void); 148 149 private int unwrap(struct magic_set *, const char *); 150 private int process(struct magic_set *ms, const char *, int); 151 private struct magic_set *load(const char *, int); 152 private void setparam(const char *); 153 private void applyparam(magic_t); 154 155 156 /* 157 * main - parse arguments and handle options 158 */ 159 int 160 main(int argc, char *argv[]) 161 { 162 int c; 163 size_t i; 164 int action = 0, didsomefiles = 0, errflg = 0; 165 int flags = 0, e = 0; 166 struct magic_set *magic = NULL; 167 int longindex; 168 const char *magicfile = NULL; /* where the magic is */ 169 170 /* makes islower etc work for other langs */ 171 #ifdef HAVE_SETLOCALE 172 (void)setlocale(LC_CTYPE, ""); 173 #endif 174 175 #ifdef __EMX__ 176 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 177 _wildcard(&argc, &argv); 178 #endif 179 180 if ((progname = strrchr(argv[0], '/')) != NULL) 181 progname++; 182 else 183 progname = argv[0]; 184 185 #ifdef S_IFLNK 186 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; 187 #endif 188 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 189 &longindex)) != -1) 190 switch (c) { 191 case OPT_HELP: 192 help(); 193 break; 194 case OPT_APPLE: 195 flags |= MAGIC_APPLE; 196 break; 197 case OPT_EXTENSIONS: 198 flags |= MAGIC_EXTENSION; 199 break; 200 case OPT_MIME_TYPE: 201 flags |= MAGIC_MIME_TYPE; 202 break; 203 case OPT_MIME_ENCODING: 204 flags |= MAGIC_MIME_ENCODING; 205 break; 206 case '0': 207 nulsep = 1; 208 break; 209 case 'b': 210 bflag++; 211 break; 212 case 'c': 213 action = FILE_CHECK; 214 break; 215 case 'C': 216 action = FILE_COMPILE; 217 break; 218 case 'd': 219 flags |= MAGIC_DEBUG|MAGIC_CHECK; 220 break; 221 case 'E': 222 flags |= MAGIC_ERROR; 223 break; 224 case 'e': 225 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 226 if (strcmp(nv[i].name, optarg) == 0) 227 break; 228 229 if (i == sizeof(nv) / sizeof(nv[0])) 230 errflg++; 231 else 232 flags |= nv[i].value; 233 break; 234 235 case 'f': 236 if(action) 237 usage(); 238 if (magic == NULL) 239 if ((magic = load(magicfile, flags)) == NULL) 240 return 1; 241 applyparam(magic); 242 e |= unwrap(magic, optarg); 243 ++didsomefiles; 244 break; 245 case 'F': 246 separator = optarg; 247 break; 248 case 'i': 249 flags |= MAGIC_MIME; 250 break; 251 case 'k': 252 flags |= MAGIC_CONTINUE; 253 break; 254 case 'l': 255 action = FILE_LIST; 256 break; 257 case 'm': 258 magicfile = optarg; 259 break; 260 case 'n': 261 ++nobuffer; 262 break; 263 case 'N': 264 ++nopad; 265 break; 266 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 267 case 'p': 268 flags |= MAGIC_PRESERVE_ATIME; 269 break; 270 #endif 271 case 'P': 272 setparam(optarg); 273 break; 274 case 'r': 275 flags |= MAGIC_RAW; 276 break; 277 case 's': 278 flags |= MAGIC_DEVICES; 279 break; 280 case 'v': 281 if (magicfile == NULL) 282 magicfile = magic_getpath(magicfile, action); 283 (void)fprintf(stdout, "%s-%s\n", progname, VERSION); 284 (void)fprintf(stdout, "magic file from %s\n", 285 magicfile); 286 return 0; 287 case 'z': 288 flags |= MAGIC_COMPRESS; 289 break; 290 291 case 'Z': 292 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP; 293 break; 294 #ifdef S_IFLNK 295 case 'L': 296 flags |= MAGIC_SYMLINK; 297 break; 298 case 'h': 299 flags &= ~MAGIC_SYMLINK; 300 break; 301 #endif 302 case '?': 303 default: 304 errflg++; 305 break; 306 } 307 308 if (errflg) { 309 usage(); 310 } 311 if (e) 312 return e; 313 314 if (MAGIC_VERSION != magic_version()) 315 (void)fprintf(stderr, "%s: compiled magic version [%d] " 316 "does not match with shared library magic version [%d]\n", 317 progname, MAGIC_VERSION, magic_version()); 318 319 switch(action) { 320 case FILE_CHECK: 321 case FILE_COMPILE: 322 case FILE_LIST: 323 /* 324 * Don't try to check/compile ~/.magic unless we explicitly 325 * ask for it. 326 */ 327 magic = magic_open(flags|MAGIC_CHECK); 328 if (magic == NULL) { 329 (void)fprintf(stderr, "%s: %s\n", progname, 330 strerror(errno)); 331 return 1; 332 } 333 334 335 switch(action) { 336 case FILE_CHECK: 337 c = magic_check(magic, magicfile); 338 break; 339 case FILE_COMPILE: 340 c = magic_compile(magic, magicfile); 341 break; 342 case FILE_LIST: 343 c = magic_list(magic, magicfile); 344 break; 345 default: 346 abort(); 347 } 348 if (c == -1) { 349 (void)fprintf(stderr, "%s: %s\n", progname, 350 magic_error(magic)); 351 return 1; 352 } 353 return 0; 354 default: 355 if (magic == NULL) 356 if ((magic = load(magicfile, flags)) == NULL) 357 return 1; 358 applyparam(magic); 359 } 360 361 if (optind == argc) { 362 if (!didsomefiles) 363 usage(); 364 } 365 else { 366 size_t j, wid, nw; 367 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 368 nw = file_mbswidth(argv[j]); 369 if (nw > wid) 370 wid = nw; 371 } 372 /* 373 * If bflag is only set twice, set it depending on 374 * number of files [this is undocumented, and subject to change] 375 */ 376 if (bflag == 2) { 377 bflag = optind >= argc - 1; 378 } 379 for (; optind < argc; optind++) 380 e |= process(magic, argv[optind], wid); 381 } 382 383 if (magic) 384 magic_close(magic); 385 return e; 386 } 387 388 private void 389 applyparam(magic_t magic) 390 { 391 size_t i; 392 393 for (i = 0; i < __arraycount(pm); i++) { 394 if (pm[i].value == 0) 395 continue; 396 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1) { 397 (void)fprintf(stderr, "%s: Can't set %s %s\n", progname, 398 pm[i].name, strerror(errno)); 399 exit(1); 400 } 401 } 402 } 403 404 private void 405 setparam(const char *p) 406 { 407 size_t i; 408 char *s; 409 410 if ((s = strchr(p, '=')) == NULL) 411 goto badparm; 412 413 for (i = 0; i < __arraycount(pm); i++) { 414 if (strncmp(p, pm[i].name, s - p) != 0) 415 continue; 416 pm[i].value = atoi(s + 1); 417 return; 418 } 419 badparm: 420 (void)fprintf(stderr, "%s: Unknown param %s\n", progname, p); 421 exit(1); 422 } 423 424 private struct magic_set * 425 /*ARGSUSED*/ 426 load(const char *magicfile, int flags) 427 { 428 struct magic_set *magic = magic_open(flags); 429 if (magic == NULL) { 430 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 431 return NULL; 432 } 433 if (magic_load(magic, magicfile) == -1) { 434 (void)fprintf(stderr, "%s: %s\n", 435 progname, magic_error(magic)); 436 magic_close(magic); 437 return NULL; 438 } 439 return magic; 440 } 441 442 /* 443 * unwrap -- read a file of filenames, do each one. 444 */ 445 private int 446 unwrap(struct magic_set *ms, const char *fn) 447 { 448 FILE *f; 449 ssize_t len; 450 char *line = NULL; 451 size_t llen = 0; 452 int wid = 0, cwid; 453 int e = 0; 454 455 if (strcmp("-", fn) == 0) { 456 f = stdin; 457 wid = 1; 458 } else { 459 if ((f = fopen(fn, "r")) == NULL) { 460 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 461 progname, fn, strerror(errno)); 462 return 1; 463 } 464 465 while ((len = getline(&line, &llen, f)) > 0) { 466 if (line[len - 1] == '\n') 467 line[len - 1] = '\0'; 468 cwid = file_mbswidth(line); 469 if (cwid > wid) 470 wid = cwid; 471 } 472 473 rewind(f); 474 } 475 476 while ((len = getline(&line, &llen, f)) > 0) { 477 if (line[len - 1] == '\n') 478 line[len - 1] = '\0'; 479 e |= process(ms, line, wid); 480 if(nobuffer) 481 (void)fflush(stdout); 482 } 483 484 free(line); 485 (void)fclose(f); 486 return e; 487 } 488 489 /* 490 * Called for each input file on the command line (or in a list of files) 491 */ 492 private int 493 process(struct magic_set *ms, const char *inname, int wid) 494 { 495 const char *type; 496 int std_in = strcmp(inname, "-") == 0; 497 498 if (wid > 0 && !bflag) { 499 (void)printf("%s", std_in ? "/dev/stdin" : inname); 500 if (nulsep) 501 (void)putc('\0', stdout); 502 (void)printf("%s", separator); 503 (void)printf("%*s ", 504 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 505 } 506 507 type = magic_file(ms, std_in ? NULL : inname); 508 if (type == NULL) { 509 (void)printf("ERROR: %s\n", magic_error(ms)); 510 return 1; 511 } else { 512 (void)printf("%s\n", type); 513 return 0; 514 } 515 } 516 517 protected size_t 518 file_mbswidth(const char *s) 519 { 520 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 521 size_t bytesconsumed, old_n, n, width = 0; 522 mbstate_t state; 523 wchar_t nextchar; 524 (void)memset(&state, 0, sizeof(mbstate_t)); 525 old_n = n = strlen(s); 526 527 while (n > 0) { 528 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 529 if (bytesconsumed == (size_t)(-1) || 530 bytesconsumed == (size_t)(-2)) { 531 /* Something went wrong, return something reasonable */ 532 return old_n; 533 } 534 if (s[0] == '\n') { 535 /* 536 * do what strlen() would do, so that caller 537 * is always right 538 */ 539 width++; 540 } else { 541 int w = wcwidth(nextchar); 542 if (w > 0) 543 width += w; 544 } 545 546 s += bytesconsumed, n -= bytesconsumed; 547 } 548 return width; 549 #else 550 return strlen(s); 551 #endif 552 } 553 554 private void 555 usage(void) 556 { 557 (void)fprintf(stderr, USAGE, progname, progname, progname); 558 exit(1); 559 } 560 561 private void 562 docprint(const char *opts) 563 { 564 size_t i; 565 int comma; 566 char *sp, *p; 567 568 p = strstr(opts, "%o"); 569 if (p == NULL) { 570 fprintf(stdout, "%s", opts); 571 return; 572 } 573 574 for (sp = p - 1; sp > opts && *sp == ' '; sp--) 575 continue; 576 577 fprintf(stdout, "%.*s", (int)(p - opts), opts); 578 579 comma = 0; 580 for (i = 0; i < __arraycount(nv); i++) { 581 fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name); 582 if (i && i % 5 == 0) { 583 fprintf(stdout, ",\n%*s", (int)(p - sp - 1), ""); 584 comma = 0; 585 } 586 } 587 588 fprintf(stdout, "%s", opts + (p - opts) + 2); 589 } 590 591 private void 592 help(void) 593 { 594 (void)fputs( 595 "Usage: file [OPTION...] [FILE...]\n" 596 "Determine type of FILEs.\n" 597 "\n", stdout); 598 #define OPT(shortname, longname, opt, doc) \ 599 fprintf(stdout, " -%c, --" longname, shortname), \ 600 docprint(doc); 601 #define OPT_LONGONLY(longname, opt, doc, id) \ 602 fprintf(stdout, " --" longname), \ 603 docprint(doc); 604 #include "file_opts.h" 605 #undef OPT 606 #undef OPT_LONGONLY 607 fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n"); 608 exit(0); 609 } 610