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 1.153 2014/02/11 15:41:04 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_LOCALE_H 58 #include <locale.h> 59 #endif 60 #ifdef HAVE_WCHAR_H 61 #include <wchar.h> 62 #endif 63 64 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION) 65 #include <getopt.h> 66 #ifndef HAVE_GETOPT_LONG 67 int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex); 68 #endif 69 #else 70 #include "mygetopt.h" 71 #endif 72 73 #ifdef S_IFLNK 74 #define FILE_FLAGS "-bcEhikLlNnprsvz0" 75 #else 76 #define FILE_FLAGS "-bcEiklNnprsvz0" 77 #endif 78 79 # define USAGE \ 80 "Usage: %s [" FILE_FLAGS \ 81 "] [--apple] [--mime-encoding] [--mime-type]\n" \ 82 " [-e testname] [-F separator] [-f namefile] [-m magicfiles] " \ 83 "file ...\n" \ 84 " %s -C [-m magicfiles]\n" \ 85 " %s [--help]\n" 86 87 private int /* Global command-line options */ 88 bflag = 0, /* brief output format */ 89 nopad = 0, /* Don't pad output */ 90 nobuffer = 0, /* Do not buffer stdout */ 91 nulsep = 0; /* Append '\0' to the separator */ 92 93 private const char *separator = ":"; /* Default field separator */ 94 private const struct option long_options[] = { 95 #define OPT(shortname, longname, opt, doc) \ 96 {longname, opt, NULL, shortname}, 97 #define OPT_LONGONLY(longname, opt, doc) \ 98 {longname, opt, NULL, 0}, 99 #include "file_opts.h" 100 #undef OPT 101 #undef OPT_LONGONLY 102 {0, 0, NULL, 0} 103 }; 104 #define OPTSTRING "bcCde:Ef:F:hiklLm:nNprsvz0" 105 106 private const struct { 107 const char *name; 108 int value; 109 } nv[] = { 110 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 111 { "ascii", MAGIC_NO_CHECK_ASCII }, 112 { "cdf", MAGIC_NO_CHECK_CDF }, 113 { "compress", MAGIC_NO_CHECK_COMPRESS }, 114 { "elf", MAGIC_NO_CHECK_ELF }, 115 { "encoding", MAGIC_NO_CHECK_ENCODING }, 116 { "soft", MAGIC_NO_CHECK_SOFT }, 117 { "tar", MAGIC_NO_CHECK_TAR }, 118 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */ 119 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */ 120 }; 121 122 private char *progname; /* used throughout */ 123 124 private void usage(void); 125 private void docprint(const char *); 126 private void help(void); 127 128 private int unwrap(struct magic_set *, const char *); 129 private int process(struct magic_set *ms, const char *, int); 130 private struct magic_set *load(const char *, int); 131 132 133 /* 134 * main - parse arguments and handle options 135 */ 136 int 137 main(int argc, char *argv[]) 138 { 139 int c; 140 size_t i; 141 int action = 0, didsomefiles = 0, errflg = 0; 142 int flags = 0, e = 0; 143 struct magic_set *magic = NULL; 144 int longindex; 145 const char *magicfile = NULL; /* where the magic is */ 146 147 /* makes islower etc work for other langs */ 148 (void)setlocale(LC_CTYPE, ""); 149 150 #ifdef __EMX__ 151 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 152 _wildcard(&argc, &argv); 153 #endif 154 155 if ((progname = strrchr(argv[0], '/')) != NULL) 156 progname++; 157 else 158 progname = argv[0]; 159 160 #ifdef S_IFLNK 161 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; 162 #endif 163 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 164 &longindex)) != -1) 165 switch (c) { 166 case 0 : 167 switch (longindex) { 168 case 0: 169 help(); 170 break; 171 case 10: 172 flags |= MAGIC_APPLE; 173 break; 174 case 11: 175 flags |= MAGIC_MIME_TYPE; 176 break; 177 case 12: 178 flags |= MAGIC_MIME_ENCODING; 179 break; 180 } 181 break; 182 case '0': 183 nulsep = 1; 184 break; 185 case 'b': 186 bflag++; 187 break; 188 case 'c': 189 action = FILE_CHECK; 190 break; 191 case 'C': 192 action = FILE_COMPILE; 193 break; 194 case 'd': 195 flags |= MAGIC_DEBUG|MAGIC_CHECK; 196 break; 197 case 'E': 198 flags |= MAGIC_ERROR; 199 break; 200 case 'e': 201 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 202 if (strcmp(nv[i].name, optarg) == 0) 203 break; 204 205 if (i == sizeof(nv) / sizeof(nv[0])) 206 errflg++; 207 else 208 flags |= nv[i].value; 209 break; 210 211 case 'f': 212 if(action) 213 usage(); 214 if (magic == NULL) 215 if ((magic = load(magicfile, flags)) == NULL) 216 return 1; 217 e |= unwrap(magic, optarg); 218 ++didsomefiles; 219 break; 220 case 'F': 221 separator = optarg; 222 break; 223 case 'i': 224 flags |= MAGIC_MIME; 225 break; 226 case 'k': 227 flags |= MAGIC_CONTINUE; 228 break; 229 case 'l': 230 action = FILE_LIST; 231 break; 232 case 'm': 233 magicfile = optarg; 234 break; 235 case 'n': 236 ++nobuffer; 237 break; 238 case 'N': 239 ++nopad; 240 break; 241 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 242 case 'p': 243 flags |= MAGIC_PRESERVE_ATIME; 244 break; 245 #endif 246 case 'r': 247 flags |= MAGIC_RAW; 248 break; 249 case 's': 250 flags |= MAGIC_DEVICES; 251 break; 252 case 'v': 253 if (magicfile == NULL) 254 magicfile = magic_getpath(magicfile, action); 255 (void)fprintf(stdout, "%s-%s\n", progname, VERSION); 256 (void)fprintf(stdout, "magic file from %s\n", 257 magicfile); 258 return 0; 259 case 'z': 260 flags |= MAGIC_COMPRESS; 261 break; 262 #ifdef S_IFLNK 263 case 'L': 264 flags |= MAGIC_SYMLINK; 265 break; 266 case 'h': 267 flags &= ~MAGIC_SYMLINK; 268 break; 269 #endif 270 case '?': 271 default: 272 errflg++; 273 break; 274 } 275 276 if (errflg) { 277 usage(); 278 } 279 if (e) 280 return e; 281 282 if (MAGIC_VERSION != magic_version()) 283 (void)fprintf(stderr, "%s: compiled magic version [%d] " 284 "does not match with shared library magic version [%d]\n", 285 progname, MAGIC_VERSION, magic_version()); 286 287 switch(action) { 288 case FILE_CHECK: 289 case FILE_COMPILE: 290 case FILE_LIST: 291 /* 292 * Don't try to check/compile ~/.magic unless we explicitly 293 * ask for it. 294 */ 295 magic = magic_open(flags|MAGIC_CHECK); 296 if (magic == NULL) { 297 (void)fprintf(stderr, "%s: %s\n", progname, 298 strerror(errno)); 299 return 1; 300 } 301 switch(action) { 302 case FILE_CHECK: 303 c = magic_check(magic, magicfile); 304 break; 305 case FILE_COMPILE: 306 c = magic_compile(magic, magicfile); 307 break; 308 case FILE_LIST: 309 c = magic_list(magic, magicfile); 310 break; 311 default: 312 abort(); 313 } 314 if (c == -1) { 315 (void)fprintf(stderr, "%s: %s\n", progname, 316 magic_error(magic)); 317 return 1; 318 } 319 return 0; 320 default: 321 if (magic == NULL) 322 if ((magic = load(magicfile, flags)) == NULL) 323 return 1; 324 break; 325 } 326 327 if (optind == argc) { 328 if (!didsomefiles) 329 usage(); 330 } 331 else { 332 size_t j, wid, nw; 333 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 334 nw = file_mbswidth(argv[j]); 335 if (nw > wid) 336 wid = nw; 337 } 338 /* 339 * If bflag is only set twice, set it depending on 340 * number of files [this is undocumented, and subject to change] 341 */ 342 if (bflag == 2) { 343 bflag = optind >= argc - 1; 344 } 345 for (; optind < argc; optind++) 346 e |= process(magic, argv[optind], wid); 347 } 348 349 if (magic) 350 magic_close(magic); 351 return e; 352 } 353 354 355 private struct magic_set * 356 /*ARGSUSED*/ 357 load(const char *magicfile, int flags) 358 { 359 struct magic_set *magic = magic_open(flags); 360 if (magic == NULL) { 361 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 362 return NULL; 363 } 364 if (magic_load(magic, magicfile) == -1) { 365 (void)fprintf(stderr, "%s: %s\n", 366 progname, magic_error(magic)); 367 magic_close(magic); 368 return NULL; 369 } 370 return magic; 371 } 372 373 /* 374 * unwrap -- read a file of filenames, do each one. 375 */ 376 private int 377 unwrap(struct magic_set *ms, const char *fn) 378 { 379 FILE *f; 380 ssize_t len; 381 char *line = NULL; 382 size_t llen = 0; 383 int wid = 0, cwid; 384 int e = 0; 385 386 if (strcmp("-", fn) == 0) { 387 f = stdin; 388 wid = 1; 389 } else { 390 if ((f = fopen(fn, "r")) == NULL) { 391 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 392 progname, fn, strerror(errno)); 393 return 1; 394 } 395 396 while ((len = getline(&line, &llen, f)) > 0) { 397 if (line[len - 1] == '\n') 398 line[len - 1] = '\0'; 399 cwid = file_mbswidth(line); 400 if (cwid > wid) 401 wid = cwid; 402 } 403 404 rewind(f); 405 } 406 407 while ((len = getline(&line, &llen, f)) > 0) { 408 if (line[len - 1] == '\n') 409 line[len - 1] = '\0'; 410 e |= process(ms, line, wid); 411 if(nobuffer) 412 (void)fflush(stdout); 413 } 414 415 free(line); 416 (void)fclose(f); 417 return e; 418 } 419 420 /* 421 * Called for each input file on the command line (or in a list of files) 422 */ 423 private int 424 process(struct magic_set *ms, const char *inname, int wid) 425 { 426 const char *type; 427 int std_in = strcmp(inname, "-") == 0; 428 429 if (wid > 0 && !bflag) { 430 (void)printf("%s", std_in ? "/dev/stdin" : inname); 431 if (nulsep) 432 (void)putc('\0', stdout); 433 (void)printf("%s", separator); 434 (void)printf("%*s ", 435 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 436 } 437 438 type = magic_file(ms, std_in ? NULL : inname); 439 if (type == NULL) { 440 (void)printf("ERROR: %s\n", magic_error(ms)); 441 return 1; 442 } else { 443 (void)printf("%s\n", type); 444 return 0; 445 } 446 } 447 448 protected size_t 449 file_mbswidth(const char *s) 450 { 451 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 452 size_t bytesconsumed, old_n, n, width = 0; 453 mbstate_t state; 454 wchar_t nextchar; 455 (void)memset(&state, 0, sizeof(mbstate_t)); 456 old_n = n = strlen(s); 457 458 while (n > 0) { 459 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 460 if (bytesconsumed == (size_t)(-1) || 461 bytesconsumed == (size_t)(-2)) { 462 /* Something went wrong, return something reasonable */ 463 return old_n; 464 } 465 if (s[0] == '\n') { 466 /* 467 * do what strlen() would do, so that caller 468 * is always right 469 */ 470 width++; 471 } else { 472 int w = wcwidth(nextchar); 473 if (w > 0) 474 width += w; 475 } 476 477 s += bytesconsumed, n -= bytesconsumed; 478 } 479 return width; 480 #else 481 return strlen(s); 482 #endif 483 } 484 485 private void 486 usage(void) 487 { 488 (void)fprintf(stderr, USAGE, progname, progname, progname); 489 exit(1); 490 } 491 492 private void 493 docprint(const char *opts) 494 { 495 size_t i; 496 int comma; 497 char *sp, *p; 498 499 p = strstr(opts, "%o"); 500 if (p == NULL) { 501 fprintf(stdout, "%s", opts); 502 return; 503 } 504 505 for (sp = p - 1; sp > opts && *sp == ' '; sp--) 506 continue; 507 508 fprintf(stdout, "%.*s", (int)(p - opts), opts); 509 510 comma = 0; 511 for (i = 0; i < __arraycount(nv); i++) { 512 fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name); 513 if (i && i % 5 == 0) { 514 fprintf(stdout, ",\n%*s", (int)(p - sp - 1), ""); 515 comma = 0; 516 } 517 } 518 519 fprintf(stdout, "%s", opts + (p - opts) + 2); 520 } 521 522 private void 523 help(void) 524 { 525 (void)fputs( 526 "Usage: file [OPTION...] [FILE...]\n" 527 "Determine type of FILEs.\n" 528 "\n", stdout); 529 #define OPT(shortname, longname, opt, doc) \ 530 fprintf(stdout, " -%c, --" longname, shortname), \ 531 docprint(doc); 532 #define OPT_LONGONLY(longname, opt, doc) \ 533 fprintf(stdout, " --" longname), \ 534 docprint(doc); 535 #include "file_opts.h" 536 #undef OPT 537 #undef OPT_LONGONLY 538 fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n"); 539 exit(0); 540 } 541