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 1.131 2009/02/13 18:48:05 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 #else 67 #include "mygetopt.h" 68 #endif 69 #ifndef HAVE_GETOPT_LONG 70 int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex); 71 #endif 72 73 #include <netinet/in.h> /* for byte swapping */ 74 75 #include "patchlevel.h" 76 77 #ifdef S_IFLNK 78 #define SYMLINKFLAG "Lh" 79 #else 80 #define SYMLINKFLAG "" 81 #endif 82 83 # define USAGE "Usage: %s [-bcik" SYMLINKFLAG "nNrsvz0] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...\n %s -C -m magicfiles\n" 84 85 #ifndef MAXPATHLEN 86 #define MAXPATHLEN 1024 87 #endif 88 89 private int /* Global command-line options */ 90 bflag = 0, /* brief output format */ 91 nopad = 0, /* Don't pad output */ 92 nobuffer = 0, /* Do not buffer stdout */ 93 nulsep = 0; /* Append '\0' to the separator */ 94 95 private const char *default_magicfile = MAGIC; 96 private const char *separator = ":"; /* Default field separator */ 97 private const char hmagic[] = "/.magic"; 98 private const struct option long_options[] = { 99 #define OPT(shortname, longname, opt, doc) \ 100 {longname, opt, NULL, shortname}, 101 #define OPT_LONGONLY(longname, opt, doc) \ 102 {longname, opt, NULL, 0}, 103 #include "file_opts.h" 104 #undef OPT 105 #undef OPT_LONGONLY 106 {0, 0, NULL, 0} 107 }; 108 #define OPTSTRING "bcCde:f:F:hikLm:nNprsvz0" 109 110 private const struct { 111 const char *name; 112 int value; 113 } nv[] = { 114 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 115 { "ascii", MAGIC_NO_CHECK_ASCII }, 116 { "cdf", MAGIC_NO_CHECK_CDF }, 117 { "compress", MAGIC_NO_CHECK_COMPRESS }, 118 { "elf", MAGIC_NO_CHECK_ELF }, 119 { "encoding", MAGIC_NO_CHECK_ENCODING }, 120 { "soft", MAGIC_NO_CHECK_SOFT }, 121 { "tar", MAGIC_NO_CHECK_TAR }, 122 { "tokens", MAGIC_NO_CHECK_TOKENS }, 123 }; 124 125 private char *progname; /* used throughout */ 126 127 private void usage(void); 128 private void help(void); 129 int main(int, char *[]); 130 131 private int unwrap(struct magic_set *, const char *); 132 private int process(struct magic_set *ms, const char *, int); 133 private struct magic_set *load(const char *, int); 134 135 136 /* 137 * main - parse arguments and handle options 138 */ 139 int 140 main(int argc, char *argv[]) 141 { 142 int c; 143 size_t i; 144 int action = 0, didsomefiles = 0, errflg = 0; 145 int flags = 0, e = 0; 146 char *home, *usermagic; 147 struct magic_set *magic = NULL; 148 char magicpath[2 * MAXPATHLEN + 2]; 149 int longindex; 150 const char *magicfile; /* where the magic is */ 151 152 /* makes islower etc work for other langs */ 153 (void)setlocale(LC_CTYPE, ""); 154 155 #ifdef __EMX__ 156 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 157 _wildcard(&argc, &argv); 158 #endif 159 160 if ((progname = strrchr(argv[0], '/')) != NULL) 161 progname++; 162 else 163 progname = argv[0]; 164 165 magicfile = default_magicfile; 166 if ((usermagic = getenv("MAGIC")) != NULL) 167 magicfile = usermagic; 168 else 169 if ((home = getenv("HOME")) != NULL) { 170 (void)snprintf(magicpath, sizeof(magicpath), "%s%s", 171 home, hmagic); 172 if (access(magicpath, R_OK) == 0) { 173 (void)snprintf(magicpath, sizeof(magicpath), 174 "%s%s:%s", home, hmagic, magicfile); 175 magicfile = magicpath; 176 } 177 } 178 179 #ifdef S_IFLNK 180 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; 181 #endif 182 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 183 &longindex)) != -1) 184 switch (c) { 185 case 0 : 186 switch (longindex) { 187 case 0: 188 help(); 189 break; 190 case 10: 191 flags |= MAGIC_APPLE; 192 break; 193 case 11: 194 flags |= MAGIC_MIME_TYPE; 195 break; 196 case 12: 197 flags |= MAGIC_MIME_ENCODING; 198 break; 199 } 200 break; 201 case '0': 202 nulsep = 1; 203 break; 204 case 'b': 205 bflag++; 206 break; 207 case 'c': 208 action = FILE_CHECK; 209 break; 210 case 'C': 211 action = FILE_COMPILE; 212 break; 213 case 'd': 214 flags |= MAGIC_DEBUG|MAGIC_CHECK; 215 break; 216 case 'e': 217 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 218 if (strcmp(nv[i].name, optarg) == 0) 219 break; 220 221 if (i == sizeof(nv) / sizeof(nv[0])) 222 errflg++; 223 else 224 flags |= nv[i].value; 225 break; 226 227 case 'f': 228 if(action) 229 usage(); 230 if (magic == NULL) 231 if ((magic = load(magicfile, flags)) == NULL) 232 return 1; 233 e |= unwrap(magic, optarg); 234 ++didsomefiles; 235 break; 236 case 'F': 237 separator = optarg; 238 break; 239 case 'i': 240 flags |= MAGIC_MIME; 241 break; 242 case 'k': 243 flags |= MAGIC_CONTINUE; 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 'r': 260 flags |= MAGIC_RAW; 261 break; 262 case 's': 263 flags |= MAGIC_DEVICES; 264 break; 265 case 'v': 266 (void)fprintf(stderr, "%s-%d.%.2d\n", progname, 267 FILE_VERSION_MAJOR, patchlevel); 268 (void)fprintf(stderr, "magic file from %s\n", 269 magicfile); 270 return 1; 271 case 'z': 272 flags |= MAGIC_COMPRESS; 273 break; 274 #ifdef S_IFLNK 275 case 'L': 276 flags |= MAGIC_SYMLINK; 277 break; 278 case 'h': 279 flags &= ~MAGIC_SYMLINK; 280 break; 281 #endif 282 case '?': 283 default: 284 errflg++; 285 break; 286 } 287 288 if (errflg) { 289 usage(); 290 } 291 if (e) 292 return e; 293 294 switch(action) { 295 case FILE_CHECK: 296 case FILE_COMPILE: 297 /* 298 * Don't try to check/compile ~/.magic unless we explicitly 299 * ask for it. 300 */ 301 if (magicfile == magicpath) 302 magicfile = default_magicfile; 303 magic = magic_open(flags|MAGIC_CHECK); 304 if (magic == NULL) { 305 (void)fprintf(stderr, "%s: %s\n", progname, 306 strerror(errno)); 307 return 1; 308 } 309 c = action == FILE_CHECK ? magic_check(magic, magicfile) : 310 magic_compile(magic, magicfile); 311 if (c == -1) { 312 (void)fprintf(stderr, "%s: %s\n", progname, 313 magic_error(magic)); 314 return 1; 315 } 316 return 0; 317 default: 318 if (magic == NULL) 319 if ((magic = load(magicfile, flags)) == NULL) 320 return 1; 321 break; 322 } 323 324 if (optind == argc) { 325 if (!didsomefiles) 326 usage(); 327 } 328 else { 329 size_t j, wid, nw; 330 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 331 nw = file_mbswidth(argv[j]); 332 if (nw > wid) 333 wid = nw; 334 } 335 /* 336 * If bflag is only set twice, set it depending on 337 * number of files [this is undocumented, and subject to change] 338 */ 339 if (bflag == 2) { 340 bflag = optind >= argc - 1; 341 } 342 for (; optind < argc; optind++) 343 e |= process(magic, argv[optind], wid); 344 } 345 346 if (magic) 347 magic_close(magic); 348 return e; 349 } 350 351 352 private struct magic_set * 353 /*ARGSUSED*/ 354 load(const char *magicfile, int flags) 355 { 356 struct magic_set *magic = magic_open(flags); 357 if (magic == NULL) { 358 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 359 return NULL; 360 } 361 if (magic_load(magic, magicfile) == -1) { 362 (void)fprintf(stderr, "%s: %s\n", 363 progname, magic_error(magic)); 364 magic_close(magic); 365 return NULL; 366 } 367 return magic; 368 } 369 370 /* 371 * unwrap -- read a file of filenames, do each one. 372 */ 373 private int 374 unwrap(struct magic_set *ms, const char *fn) 375 { 376 char buf[MAXPATHLEN]; 377 FILE *f; 378 int wid = 0, cwid; 379 int e = 0; 380 381 if (strcmp("-", fn) == 0) { 382 f = stdin; 383 wid = 1; 384 } else { 385 if ((f = fopen(fn, "r")) == NULL) { 386 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 387 progname, fn, strerror(errno)); 388 return 1; 389 } 390 391 while (fgets(buf, sizeof(buf), f) != NULL) { 392 buf[strcspn(buf, "\n")] = '\0'; 393 cwid = file_mbswidth(buf); 394 if (cwid > wid) 395 wid = cwid; 396 } 397 398 rewind(f); 399 } 400 401 while (fgets(buf, sizeof(buf), f) != NULL) { 402 buf[strcspn(buf, "\n")] = '\0'; 403 e |= process(ms, buf, wid); 404 if(nobuffer) 405 (void)fflush(stdout); 406 } 407 408 (void)fclose(f); 409 return e; 410 } 411 412 /* 413 * Called for each input file on the command line (or in a list of files) 414 */ 415 private int 416 process(struct magic_set *ms, const char *inname, int wid) 417 { 418 const char *type; 419 int std_in = strcmp(inname, "-") == 0; 420 421 if (wid > 0 && !bflag) { 422 (void)printf("%s", std_in ? "/dev/stdin" : inname); 423 if (nulsep) 424 (void)putc('\0', stdout); 425 else 426 (void)printf("%s", separator); 427 (void)printf("%*s ", 428 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 429 } 430 431 type = magic_file(ms, std_in ? NULL : inname); 432 if (type == NULL) { 433 (void)printf("ERROR: %s\n", magic_error(ms)); 434 return 1; 435 } else { 436 (void)printf("%s\n", type); 437 return 0; 438 } 439 } 440 441 size_t 442 file_mbswidth(const char *s) 443 { 444 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 445 size_t bytesconsumed, old_n, n, width = 0; 446 mbstate_t state; 447 wchar_t nextchar; 448 (void)memset(&state, 0, sizeof(mbstate_t)); 449 old_n = n = strlen(s); 450 451 while (n > 0) { 452 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 453 if (bytesconsumed == (size_t)(-1) || 454 bytesconsumed == (size_t)(-2)) { 455 /* Something went wrong, return something reasonable */ 456 return old_n; 457 } 458 if (s[0] == '\n') { 459 /* 460 * do what strlen() would do, so that caller 461 * is always right 462 */ 463 width++; 464 } else 465 width += wcwidth(nextchar); 466 467 s += bytesconsumed, n -= bytesconsumed; 468 } 469 return width; 470 #else 471 return strlen(s); 472 #endif 473 } 474 475 private void 476 usage(void) 477 { 478 (void)fprintf(stderr, USAGE, progname, progname); 479 (void)fputs("Try `file --help' for more information.\n", stderr); 480 exit(1); 481 } 482 483 private void 484 help(void) 485 { 486 (void)fputs( 487 "Usage: file [OPTION...] [FILE...]\n" 488 "Determine type of FILEs.\n" 489 "\n", stderr); 490 #define OPT(shortname, longname, opt, doc) \ 491 fprintf(stderr, " -%c, --" longname doc, shortname); 492 #define OPT_LONGONLY(longname, opt, doc) \ 493 fprintf(stderr, " --" longname doc); 494 #include "file_opts.h" 495 #undef OPT 496 #undef OPT_LONGONLY 497 exit(0); 498 } 499