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 1.164 2015/06/03 18:21:24 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 }; 135 136 private char *progname; /* used throughout */ 137 138 #ifdef __dead 139 __dead 140 #endif 141 private void usage(void); 142 private void docprint(const char *); 143 #ifdef __dead 144 __dead 145 #endif 146 private void help(void); 147 148 private int unwrap(struct magic_set *, const char *); 149 private int process(struct magic_set *ms, const char *, int); 150 private struct magic_set *load(const char *, int); 151 private void setparam(const char *); 152 private void applyparam(magic_t); 153 154 155 /* 156 * main - parse arguments and handle options 157 */ 158 int 159 main(int argc, char *argv[]) 160 { 161 int c; 162 size_t i; 163 int action = 0, didsomefiles = 0, errflg = 0; 164 int flags = 0, e = 0; 165 struct magic_set *magic = NULL; 166 int longindex; 167 const char *magicfile = NULL; /* where the magic is */ 168 169 /* makes islower etc work for other langs */ 170 #ifdef HAVE_SETLOCALE 171 (void)setlocale(LC_CTYPE, ""); 172 #endif 173 174 #ifdef __EMX__ 175 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 176 _wildcard(&argc, &argv); 177 #endif 178 179 if ((progname = strrchr(argv[0], '/')) != NULL) 180 progname++; 181 else 182 progname = argv[0]; 183 184 #ifdef S_IFLNK 185 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; 186 #endif 187 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 188 &longindex)) != -1) 189 switch (c) { 190 case OPT_HELP: 191 help(); 192 break; 193 case OPT_APPLE: 194 flags |= MAGIC_APPLE; 195 break; 196 case OPT_EXTENSIONS: 197 flags |= MAGIC_EXTENSION; 198 break; 199 case OPT_MIME_TYPE: 200 flags |= MAGIC_MIME_TYPE; 201 break; 202 case OPT_MIME_ENCODING: 203 flags |= MAGIC_MIME_ENCODING; 204 break; 205 case '0': 206 nulsep = 1; 207 break; 208 case 'b': 209 bflag++; 210 break; 211 case 'c': 212 action = FILE_CHECK; 213 break; 214 case 'C': 215 action = FILE_COMPILE; 216 break; 217 case 'd': 218 flags |= MAGIC_DEBUG|MAGIC_CHECK; 219 break; 220 case 'E': 221 flags |= MAGIC_ERROR; 222 break; 223 case 'e': 224 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 225 if (strcmp(nv[i].name, optarg) == 0) 226 break; 227 228 if (i == sizeof(nv) / sizeof(nv[0])) 229 errflg++; 230 else 231 flags |= nv[i].value; 232 break; 233 234 case 'f': 235 if(action) 236 usage(); 237 if (magic == NULL) 238 if ((magic = load(magicfile, flags)) == NULL) 239 return 1; 240 e |= unwrap(magic, optarg); 241 ++didsomefiles; 242 break; 243 case 'F': 244 separator = optarg; 245 break; 246 case 'i': 247 flags |= MAGIC_MIME; 248 break; 249 case 'k': 250 flags |= MAGIC_CONTINUE; 251 break; 252 case 'l': 253 action = FILE_LIST; 254 break; 255 case 'm': 256 magicfile = optarg; 257 break; 258 case 'n': 259 ++nobuffer; 260 break; 261 case 'N': 262 ++nopad; 263 break; 264 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 265 case 'p': 266 flags |= MAGIC_PRESERVE_ATIME; 267 break; 268 #endif 269 case 'P': 270 setparam(optarg); 271 break; 272 case 'r': 273 flags |= MAGIC_RAW; 274 break; 275 case 's': 276 flags |= MAGIC_DEVICES; 277 break; 278 case 'v': 279 if (magicfile == NULL) 280 magicfile = magic_getpath(magicfile, action); 281 (void)fprintf(stdout, "%s-%s\n", progname, VERSION); 282 (void)fprintf(stdout, "magic file from %s\n", 283 magicfile); 284 return 0; 285 case 'z': 286 flags |= MAGIC_COMPRESS; 287 break; 288 289 case 'Z': 290 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP; 291 break; 292 #ifdef S_IFLNK 293 case 'L': 294 flags |= MAGIC_SYMLINK; 295 break; 296 case 'h': 297 flags &= ~MAGIC_SYMLINK; 298 break; 299 #endif 300 case '?': 301 default: 302 errflg++; 303 break; 304 } 305 306 if (errflg) { 307 usage(); 308 } 309 if (e) 310 return e; 311 312 if (MAGIC_VERSION != magic_version()) 313 (void)fprintf(stderr, "%s: compiled magic version [%d] " 314 "does not match with shared library magic version [%d]\n", 315 progname, MAGIC_VERSION, magic_version()); 316 317 switch(action) { 318 case FILE_CHECK: 319 case FILE_COMPILE: 320 case FILE_LIST: 321 /* 322 * Don't try to check/compile ~/.magic unless we explicitly 323 * ask for it. 324 */ 325 magic = magic_open(flags|MAGIC_CHECK); 326 if (magic == NULL) { 327 (void)fprintf(stderr, "%s: %s\n", progname, 328 strerror(errno)); 329 return 1; 330 } 331 332 333 switch(action) { 334 case FILE_CHECK: 335 c = magic_check(magic, magicfile); 336 break; 337 case FILE_COMPILE: 338 c = magic_compile(magic, magicfile); 339 break; 340 case FILE_LIST: 341 c = magic_list(magic, magicfile); 342 break; 343 default: 344 abort(); 345 } 346 if (c == -1) { 347 (void)fprintf(stderr, "%s: %s\n", progname, 348 magic_error(magic)); 349 return 1; 350 } 351 return 0; 352 default: 353 if (magic == NULL) 354 if ((magic = load(magicfile, flags)) == NULL) 355 return 1; 356 applyparam(magic); 357 } 358 359 if (optind == argc) { 360 if (!didsomefiles) 361 usage(); 362 } 363 else { 364 size_t j, wid, nw; 365 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 366 nw = file_mbswidth(argv[j]); 367 if (nw > wid) 368 wid = nw; 369 } 370 /* 371 * If bflag is only set twice, set it depending on 372 * number of files [this is undocumented, and subject to change] 373 */ 374 if (bflag == 2) { 375 bflag = optind >= argc - 1; 376 } 377 for (; optind < argc; optind++) 378 e |= process(magic, argv[optind], wid); 379 } 380 381 if (magic) 382 magic_close(magic); 383 return e; 384 } 385 386 private void 387 applyparam(magic_t magic) 388 { 389 size_t i; 390 391 for (i = 0; i < __arraycount(pm); i++) { 392 if (pm[i].value == 0) 393 continue; 394 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1) { 395 (void)fprintf(stderr, "%s: Can't set %s %s\n", progname, 396 pm[i].name, strerror(errno)); 397 exit(1); 398 } 399 } 400 } 401 402 private void 403 setparam(const char *p) 404 { 405 size_t i; 406 char *s; 407 408 if ((s = strchr(p, '=')) == NULL) 409 goto badparm; 410 411 for (i = 0; i < __arraycount(pm); i++) { 412 if (strncmp(p, pm[i].name, s - p) != 0) 413 continue; 414 pm[i].value = atoi(s + 1); 415 return; 416 } 417 badparm: 418 (void)fprintf(stderr, "%s: Unknown param %s\n", progname, p); 419 exit(1); 420 } 421 422 private struct magic_set * 423 /*ARGSUSED*/ 424 load(const char *magicfile, int flags) 425 { 426 struct magic_set *magic = magic_open(flags); 427 if (magic == NULL) { 428 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 429 return NULL; 430 } 431 if (magic_load(magic, magicfile) == -1) { 432 (void)fprintf(stderr, "%s: %s\n", 433 progname, magic_error(magic)); 434 magic_close(magic); 435 return NULL; 436 } 437 return magic; 438 } 439 440 /* 441 * unwrap -- read a file of filenames, do each one. 442 */ 443 private int 444 unwrap(struct magic_set *ms, const char *fn) 445 { 446 FILE *f; 447 ssize_t len; 448 char *line = NULL; 449 size_t llen = 0; 450 int wid = 0, cwid; 451 int e = 0; 452 453 if (strcmp("-", fn) == 0) { 454 f = stdin; 455 wid = 1; 456 } else { 457 if ((f = fopen(fn, "r")) == NULL) { 458 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 459 progname, fn, strerror(errno)); 460 return 1; 461 } 462 463 while ((len = getline(&line, &llen, f)) > 0) { 464 if (line[len - 1] == '\n') 465 line[len - 1] = '\0'; 466 cwid = file_mbswidth(line); 467 if (cwid > wid) 468 wid = cwid; 469 } 470 471 rewind(f); 472 } 473 474 while ((len = getline(&line, &llen, f)) > 0) { 475 if (line[len - 1] == '\n') 476 line[len - 1] = '\0'; 477 e |= process(ms, line, wid); 478 if(nobuffer) 479 (void)fflush(stdout); 480 } 481 482 free(line); 483 (void)fclose(f); 484 return e; 485 } 486 487 /* 488 * Called for each input file on the command line (or in a list of files) 489 */ 490 private int 491 process(struct magic_set *ms, const char *inname, int wid) 492 { 493 const char *type; 494 int std_in = strcmp(inname, "-") == 0; 495 496 if (wid > 0 && !bflag) { 497 (void)printf("%s", std_in ? "/dev/stdin" : inname); 498 if (nulsep) 499 (void)putc('\0', stdout); 500 (void)printf("%s", separator); 501 (void)printf("%*s ", 502 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 503 } 504 505 type = magic_file(ms, std_in ? NULL : inname); 506 if (type == NULL) { 507 (void)printf("ERROR: %s\n", magic_error(ms)); 508 return 1; 509 } else { 510 (void)printf("%s\n", type); 511 return 0; 512 } 513 } 514 515 protected size_t 516 file_mbswidth(const char *s) 517 { 518 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 519 size_t bytesconsumed, old_n, n, width = 0; 520 mbstate_t state; 521 wchar_t nextchar; 522 (void)memset(&state, 0, sizeof(mbstate_t)); 523 old_n = n = strlen(s); 524 525 while (n > 0) { 526 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 527 if (bytesconsumed == (size_t)(-1) || 528 bytesconsumed == (size_t)(-2)) { 529 /* Something went wrong, return something reasonable */ 530 return old_n; 531 } 532 if (s[0] == '\n') { 533 /* 534 * do what strlen() would do, so that caller 535 * is always right 536 */ 537 width++; 538 } else { 539 int w = wcwidth(nextchar); 540 if (w > 0) 541 width += w; 542 } 543 544 s += bytesconsumed, n -= bytesconsumed; 545 } 546 return width; 547 #else 548 return strlen(s); 549 #endif 550 } 551 552 private void 553 usage(void) 554 { 555 (void)fprintf(stderr, USAGE, progname, progname, progname); 556 exit(1); 557 } 558 559 private void 560 docprint(const char *opts) 561 { 562 size_t i; 563 int comma; 564 char *sp, *p; 565 566 p = strstr(opts, "%o"); 567 if (p == NULL) { 568 fprintf(stdout, "%s", opts); 569 return; 570 } 571 572 for (sp = p - 1; sp > opts && *sp == ' '; sp--) 573 continue; 574 575 fprintf(stdout, "%.*s", (int)(p - opts), opts); 576 577 comma = 0; 578 for (i = 0; i < __arraycount(nv); i++) { 579 fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name); 580 if (i && i % 5 == 0) { 581 fprintf(stdout, ",\n%*s", (int)(p - sp - 1), ""); 582 comma = 0; 583 } 584 } 585 586 fprintf(stdout, "%s", opts + (p - opts) + 2); 587 } 588 589 private void 590 help(void) 591 { 592 (void)fputs( 593 "Usage: file [OPTION...] [FILE...]\n" 594 "Determine type of FILEs.\n" 595 "\n", stdout); 596 #define OPT(shortname, longname, opt, doc) \ 597 fprintf(stdout, " -%c, --" longname, shortname), \ 598 docprint(doc); 599 #define OPT_LONGONLY(longname, opt, doc, id) \ 600 fprintf(stdout, " --" longname), \ 601 docprint(doc); 602 #include "file_opts.h" 603 #undef OPT 604 #undef OPT_LONGONLY 605 fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n"); 606 exit(0); 607 } 608