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 1.160 2014/12/16 23:18:40 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 "-bcEhikLlNnprsvz0" 72 #else 73 #define FILE_FLAGS "-bcEiklNnprsvz0" 74 #endif 75 76 # define USAGE \ 77 "Usage: %s [" FILE_FLAGS \ 78 "] [--apple] [--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(shortname, longname, opt, doc) \ 93 {longname, opt, NULL, shortname}, 94 #define OPT_LONGONLY(longname, opt, doc) \ 95 {longname, opt, NULL, 0}, 96 #include "file_opts.h" 97 #undef OPT 98 #undef OPT_LONGONLY 99 {0, 0, NULL, 0} 100 }; 101 #define OPTSTRING "bcCde:Ef:F:hiklLm:nNpP:rsvz0" 102 103 private const struct { 104 const char *name; 105 int value; 106 } nv[] = { 107 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 108 { "ascii", MAGIC_NO_CHECK_ASCII }, 109 { "cdf", MAGIC_NO_CHECK_CDF }, 110 { "compress", MAGIC_NO_CHECK_COMPRESS }, 111 { "elf", MAGIC_NO_CHECK_ELF }, 112 { "encoding", MAGIC_NO_CHECK_ENCODING }, 113 { "soft", MAGIC_NO_CHECK_SOFT }, 114 { "tar", MAGIC_NO_CHECK_TAR }, 115 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */ 116 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */ 117 }; 118 119 private struct { 120 const char *name; 121 int tag; 122 size_t value; 123 } pm[] = { 124 { "indir", MAGIC_PARAM_INDIR_MAX, 0 }, 125 { "name", MAGIC_PARAM_NAME_MAX, 0 }, 126 { "elf_phnum", MAGIC_PARAM_ELF_PHNUM_MAX, 0 }, 127 { "elf_shnum", MAGIC_PARAM_ELF_SHNUM_MAX, 0 }, 128 { "elf_notes", MAGIC_PARAM_ELF_NOTES_MAX, 0 }, 129 }; 130 131 private char *progname; /* used throughout */ 132 133 private void usage(void); 134 private void docprint(const char *); 135 private void help(void); 136 137 private int unwrap(struct magic_set *, const char *); 138 private int process(struct magic_set *ms, const char *, int); 139 private struct magic_set *load(const char *, int); 140 private void setparam(const char *); 141 private void applyparam(magic_t); 142 143 144 /* 145 * main - parse arguments and handle options 146 */ 147 int 148 main(int argc, char *argv[]) 149 { 150 int c; 151 size_t i; 152 int action = 0, didsomefiles = 0, errflg = 0; 153 int flags = 0, e = 0; 154 struct magic_set *magic = NULL; 155 int longindex; 156 const char *magicfile = NULL; /* where the magic is */ 157 158 /* makes islower etc work for other langs */ 159 #ifdef HAVE_SETLOCALE 160 (void)setlocale(LC_CTYPE, ""); 161 #endif 162 163 #ifdef __EMX__ 164 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 165 _wildcard(&argc, &argv); 166 #endif 167 168 if ((progname = strrchr(argv[0], '/')) != NULL) 169 progname++; 170 else 171 progname = argv[0]; 172 173 #ifdef S_IFLNK 174 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; 175 #endif 176 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 177 &longindex)) != -1) 178 switch (c) { 179 case 0 : 180 switch (longindex) { 181 case 0: 182 help(); 183 break; 184 case 10: 185 flags |= MAGIC_APPLE; 186 break; 187 case 11: 188 flags |= MAGIC_MIME_TYPE; 189 break; 190 case 12: 191 flags |= MAGIC_MIME_ENCODING; 192 break; 193 } 194 break; 195 case '0': 196 nulsep = 1; 197 break; 198 case 'b': 199 bflag++; 200 break; 201 case 'c': 202 action = FILE_CHECK; 203 break; 204 case 'C': 205 action = FILE_COMPILE; 206 break; 207 case 'd': 208 flags |= MAGIC_DEBUG|MAGIC_CHECK; 209 break; 210 case 'E': 211 flags |= MAGIC_ERROR; 212 break; 213 case 'e': 214 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 215 if (strcmp(nv[i].name, optarg) == 0) 216 break; 217 218 if (i == sizeof(nv) / sizeof(nv[0])) 219 errflg++; 220 else 221 flags |= nv[i].value; 222 break; 223 224 case 'f': 225 if(action) 226 usage(); 227 if (magic == NULL) 228 if ((magic = load(magicfile, flags)) == NULL) 229 return 1; 230 e |= unwrap(magic, optarg); 231 ++didsomefiles; 232 break; 233 case 'F': 234 separator = optarg; 235 break; 236 case 'i': 237 flags |= MAGIC_MIME; 238 break; 239 case 'k': 240 flags |= MAGIC_CONTINUE; 241 break; 242 case 'l': 243 action = FILE_LIST; 244 break; 245 case 'm': 246 magicfile = optarg; 247 break; 248 case 'n': 249 ++nobuffer; 250 break; 251 case 'N': 252 ++nopad; 253 break; 254 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 255 case 'p': 256 flags |= MAGIC_PRESERVE_ATIME; 257 break; 258 #endif 259 case 'P': 260 setparam(optarg); 261 break; 262 case 'r': 263 flags |= MAGIC_RAW; 264 break; 265 break; 266 case 's': 267 flags |= MAGIC_DEVICES; 268 break; 269 case 'v': 270 if (magicfile == NULL) 271 magicfile = magic_getpath(magicfile, action); 272 (void)fprintf(stdout, "%s-%s\n", progname, VERSION); 273 (void)fprintf(stdout, "magic file from %s\n", 274 magicfile); 275 return 0; 276 case 'z': 277 flags |= MAGIC_COMPRESS; 278 break; 279 #ifdef S_IFLNK 280 case 'L': 281 flags |= MAGIC_SYMLINK; 282 break; 283 case 'h': 284 flags &= ~MAGIC_SYMLINK; 285 break; 286 #endif 287 case '?': 288 default: 289 errflg++; 290 break; 291 } 292 293 if (errflg) { 294 usage(); 295 } 296 if (e) 297 return e; 298 299 if (MAGIC_VERSION != magic_version()) 300 (void)fprintf(stderr, "%s: compiled magic version [%d] " 301 "does not match with shared library magic version [%d]\n", 302 progname, MAGIC_VERSION, magic_version()); 303 304 switch(action) { 305 case FILE_CHECK: 306 case FILE_COMPILE: 307 case FILE_LIST: 308 /* 309 * Don't try to check/compile ~/.magic unless we explicitly 310 * ask for it. 311 */ 312 magic = magic_open(flags|MAGIC_CHECK); 313 if (magic == NULL) { 314 (void)fprintf(stderr, "%s: %s\n", progname, 315 strerror(errno)); 316 return 1; 317 } 318 319 320 switch(action) { 321 case FILE_CHECK: 322 c = magic_check(magic, magicfile); 323 break; 324 case FILE_COMPILE: 325 c = magic_compile(magic, magicfile); 326 break; 327 case FILE_LIST: 328 c = magic_list(magic, magicfile); 329 break; 330 default: 331 abort(); 332 } 333 if (c == -1) { 334 (void)fprintf(stderr, "%s: %s\n", progname, 335 magic_error(magic)); 336 return 1; 337 } 338 return 0; 339 default: 340 if (magic == NULL) 341 if ((magic = load(magicfile, flags)) == NULL) 342 return 1; 343 applyparam(magic); 344 } 345 346 if (optind == argc) { 347 if (!didsomefiles) 348 usage(); 349 } 350 else { 351 size_t j, wid, nw; 352 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 353 nw = file_mbswidth(argv[j]); 354 if (nw > wid) 355 wid = nw; 356 } 357 /* 358 * If bflag is only set twice, set it depending on 359 * number of files [this is undocumented, and subject to change] 360 */ 361 if (bflag == 2) { 362 bflag = optind >= argc - 1; 363 } 364 for (; optind < argc; optind++) 365 e |= process(magic, argv[optind], wid); 366 } 367 368 if (magic) 369 magic_close(magic); 370 return e; 371 } 372 373 private void 374 applyparam(magic_t magic) 375 { 376 size_t i; 377 378 for (i = 0; i < __arraycount(pm); i++) { 379 if (pm[i].value == 0) 380 continue; 381 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1) { 382 (void)fprintf(stderr, "%s: Can't set %s %s\n", progname, 383 pm[i].name, strerror(errno)); 384 exit(1); 385 } 386 } 387 } 388 389 private void 390 setparam(const char *p) 391 { 392 size_t i; 393 char *s; 394 395 if ((s = strchr(p, '=')) == NULL) 396 goto badparm; 397 398 for (i = 0; i < __arraycount(pm); i++) { 399 if (strncmp(p, pm[i].name, s - p) != 0) 400 continue; 401 pm[i].value = atoi(s + 1); 402 return; 403 } 404 badparm: 405 (void)fprintf(stderr, "%s: Unknown param %s\n", progname, p); 406 exit(1); 407 } 408 409 private struct magic_set * 410 /*ARGSUSED*/ 411 load(const char *magicfile, int flags) 412 { 413 struct magic_set *magic = magic_open(flags); 414 if (magic == NULL) { 415 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 416 return NULL; 417 } 418 if (magic_load(magic, magicfile) == -1) { 419 (void)fprintf(stderr, "%s: %s\n", 420 progname, magic_error(magic)); 421 magic_close(magic); 422 return NULL; 423 } 424 return magic; 425 } 426 427 /* 428 * unwrap -- read a file of filenames, do each one. 429 */ 430 private int 431 unwrap(struct magic_set *ms, const char *fn) 432 { 433 FILE *f; 434 ssize_t len; 435 char *line = NULL; 436 size_t llen = 0; 437 int wid = 0, cwid; 438 int e = 0; 439 440 if (strcmp("-", fn) == 0) { 441 f = stdin; 442 wid = 1; 443 } else { 444 if ((f = fopen(fn, "r")) == NULL) { 445 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 446 progname, fn, strerror(errno)); 447 return 1; 448 } 449 450 while ((len = getline(&line, &llen, f)) > 0) { 451 if (line[len - 1] == '\n') 452 line[len - 1] = '\0'; 453 cwid = file_mbswidth(line); 454 if (cwid > wid) 455 wid = cwid; 456 } 457 458 rewind(f); 459 } 460 461 while ((len = getline(&line, &llen, f)) > 0) { 462 if (line[len - 1] == '\n') 463 line[len - 1] = '\0'; 464 e |= process(ms, line, wid); 465 if(nobuffer) 466 (void)fflush(stdout); 467 } 468 469 free(line); 470 (void)fclose(f); 471 return e; 472 } 473 474 /* 475 * Called for each input file on the command line (or in a list of files) 476 */ 477 private int 478 process(struct magic_set *ms, const char *inname, int wid) 479 { 480 const char *type; 481 int std_in = strcmp(inname, "-") == 0; 482 483 if (wid > 0 && !bflag) { 484 (void)printf("%s", std_in ? "/dev/stdin" : inname); 485 if (nulsep) 486 (void)putc('\0', stdout); 487 (void)printf("%s", separator); 488 (void)printf("%*s ", 489 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 490 } 491 492 type = magic_file(ms, std_in ? NULL : inname); 493 if (type == NULL) { 494 (void)printf("ERROR: %s\n", magic_error(ms)); 495 return 1; 496 } else { 497 (void)printf("%s\n", type); 498 return 0; 499 } 500 } 501 502 protected size_t 503 file_mbswidth(const char *s) 504 { 505 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 506 size_t bytesconsumed, old_n, n, width = 0; 507 mbstate_t state; 508 wchar_t nextchar; 509 (void)memset(&state, 0, sizeof(mbstate_t)); 510 old_n = n = strlen(s); 511 512 while (n > 0) { 513 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 514 if (bytesconsumed == (size_t)(-1) || 515 bytesconsumed == (size_t)(-2)) { 516 /* Something went wrong, return something reasonable */ 517 return old_n; 518 } 519 if (s[0] == '\n') { 520 /* 521 * do what strlen() would do, so that caller 522 * is always right 523 */ 524 width++; 525 } else { 526 int w = wcwidth(nextchar); 527 if (w > 0) 528 width += w; 529 } 530 531 s += bytesconsumed, n -= bytesconsumed; 532 } 533 return width; 534 #else 535 return strlen(s); 536 #endif 537 } 538 539 private void 540 usage(void) 541 { 542 (void)fprintf(stderr, USAGE, progname, progname, progname); 543 exit(1); 544 } 545 546 private void 547 docprint(const char *opts) 548 { 549 size_t i; 550 int comma; 551 char *sp, *p; 552 553 p = strstr(opts, "%o"); 554 if (p == NULL) { 555 fprintf(stdout, "%s", opts); 556 return; 557 } 558 559 for (sp = p - 1; sp > opts && *sp == ' '; sp--) 560 continue; 561 562 fprintf(stdout, "%.*s", (int)(p - opts), opts); 563 564 comma = 0; 565 for (i = 0; i < __arraycount(nv); i++) { 566 fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name); 567 if (i && i % 5 == 0) { 568 fprintf(stdout, ",\n%*s", (int)(p - sp - 1), ""); 569 comma = 0; 570 } 571 } 572 573 fprintf(stdout, "%s", opts + (p - opts) + 2); 574 } 575 576 private void 577 help(void) 578 { 579 (void)fputs( 580 "Usage: file [OPTION...] [FILE...]\n" 581 "Determine type of FILEs.\n" 582 "\n", stdout); 583 #define OPT(shortname, longname, opt, doc) \ 584 fprintf(stdout, " -%c, --" longname, shortname), \ 585 docprint(doc); 586 #define OPT_LONGONLY(longname, opt, doc) \ 587 fprintf(stdout, " --" longname), \ 588 docprint(doc); 589 #include "file_opts.h" 590 #undef OPT 591 #undef OPT_LONGONLY 592 fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n"); 593 exit(0); 594 } 595