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 1.136 2009/12/06 23:18:04 rrt 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 #include "patchlevel.h" 74 75 #ifdef S_IFLNK 76 #define FILE_FLAGS "-bchikLNnprsvz0" 77 #else 78 #define FILE_FLAGS "-bcikNnprsvz0" 79 #endif 80 81 # define USAGE \ 82 "Usage: %s [" FILE_FLAGS \ 83 "] [--apple] [--mime-encoding] [--mime-type]\n" \ 84 " [-e testname] [-F separator] [-f namefile] [-m magicfiles] file ...\n" \ 85 " %s -C [-m magicfiles]\n" \ 86 " %s [--help]\n" 87 88 #ifndef MAXPATHLEN 89 #define MAXPATHLEN 1024 90 #endif 91 92 private int /* Global command-line options */ 93 bflag = 0, /* brief output format */ 94 nopad = 0, /* Don't pad output */ 95 nobuffer = 0, /* Do not buffer stdout */ 96 nulsep = 0; /* Append '\0' to the separator */ 97 98 private const char *separator = ":"; /* Default field separator */ 99 private const struct option long_options[] = { 100 #define OPT(shortname, longname, opt, doc) \ 101 {longname, opt, NULL, shortname}, 102 #define OPT_LONGONLY(longname, opt, doc) \ 103 {longname, opt, NULL, 0}, 104 #include "file_opts.h" 105 #undef OPT 106 #undef OPT_LONGONLY 107 {0, 0, NULL, 0} 108 }; 109 #define OPTSTRING "bcCde:f:F:hikLm:nNprsvz0" 110 111 private const struct { 112 const char *name; 113 int value; 114 } nv[] = { 115 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 116 { "ascii", MAGIC_NO_CHECK_ASCII }, 117 { "cdf", MAGIC_NO_CHECK_CDF }, 118 { "compress", MAGIC_NO_CHECK_COMPRESS }, 119 { "elf", MAGIC_NO_CHECK_ELF }, 120 { "encoding", MAGIC_NO_CHECK_ENCODING }, 121 { "soft", MAGIC_NO_CHECK_SOFT }, 122 { "tar", MAGIC_NO_CHECK_TAR }, 123 { "tokens", MAGIC_NO_CHECK_TOKENS }, 124 }; 125 126 private char *progname; /* used throughout */ 127 128 private void usage(void); 129 private void help(void); 130 int main(int, char *[]); 131 132 private int unwrap(struct magic_set *, const char *); 133 private int process(struct magic_set *ms, const char *, int); 134 private struct magic_set *load(const char *, int); 135 136 137 /* 138 * main - parse arguments and handle options 139 */ 140 int 141 main(int argc, char *argv[]) 142 { 143 int c; 144 size_t i; 145 int action = 0, didsomefiles = 0, errflg = 0; 146 int flags = 0, e = 0; 147 struct magic_set *magic = NULL; 148 int longindex; 149 const char *magicfile = NULL; /* where the magic is */ 150 151 /* makes islower etc work for other langs */ 152 (void)setlocale(LC_CTYPE, ""); 153 154 #ifdef __EMX__ 155 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 156 _wildcard(&argc, &argv); 157 #endif 158 159 if ((progname = strrchr(argv[0], '/')) != NULL) 160 progname++; 161 else 162 progname = argv[0]; 163 164 #ifdef S_IFLNK 165 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; 166 #endif 167 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 168 &longindex)) != -1) 169 switch (c) { 170 case 0 : 171 switch (longindex) { 172 case 0: 173 help(); 174 break; 175 case 10: 176 flags |= MAGIC_APPLE; 177 break; 178 case 11: 179 flags |= MAGIC_MIME_TYPE; 180 break; 181 case 12: 182 flags |= MAGIC_MIME_ENCODING; 183 break; 184 } 185 break; 186 case '0': 187 nulsep = 1; 188 break; 189 case 'b': 190 bflag++; 191 break; 192 case 'c': 193 action = FILE_CHECK; 194 break; 195 case 'C': 196 action = FILE_COMPILE; 197 break; 198 case 'd': 199 flags |= MAGIC_DEBUG|MAGIC_CHECK; 200 break; 201 case 'e': 202 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 203 if (strcmp(nv[i].name, optarg) == 0) 204 break; 205 206 if (i == sizeof(nv) / sizeof(nv[0])) 207 errflg++; 208 else 209 flags |= nv[i].value; 210 break; 211 212 case 'f': 213 if(action) 214 usage(); 215 if (magic == NULL) 216 if ((magic = load(magicfile, flags)) == NULL) 217 return 1; 218 e |= unwrap(magic, optarg); 219 ++didsomefiles; 220 break; 221 case 'F': 222 separator = optarg; 223 break; 224 case 'i': 225 flags |= MAGIC_MIME; 226 break; 227 case 'k': 228 flags |= MAGIC_CONTINUE; 229 break; 230 case 'm': 231 magicfile = optarg; 232 break; 233 case 'n': 234 ++nobuffer; 235 break; 236 case 'N': 237 ++nopad; 238 break; 239 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 240 case 'p': 241 flags |= MAGIC_PRESERVE_ATIME; 242 break; 243 #endif 244 case 'r': 245 flags |= MAGIC_RAW; 246 break; 247 case 's': 248 flags |= MAGIC_DEVICES; 249 break; 250 case 'v': 251 if (magicfile == NULL) 252 magicfile = magic_getpath(magicfile, action); 253 (void)fprintf(stderr, "%s-%d.%.2d\n", progname, 254 FILE_VERSION_MAJOR, patchlevel); 255 (void)fprintf(stderr, "magic file from %s\n", 256 magicfile); 257 return 1; 258 case 'z': 259 flags |= MAGIC_COMPRESS; 260 break; 261 #ifdef S_IFLNK 262 case 'L': 263 flags |= MAGIC_SYMLINK; 264 break; 265 case 'h': 266 flags &= ~MAGIC_SYMLINK; 267 break; 268 #endif 269 case '?': 270 default: 271 errflg++; 272 break; 273 } 274 275 if (errflg) { 276 usage(); 277 } 278 if (e) 279 return e; 280 281 switch(action) { 282 case FILE_CHECK: 283 case FILE_COMPILE: 284 /* 285 * Don't try to check/compile ~/.magic unless we explicitly 286 * ask for it. 287 */ 288 magic = magic_open(flags|MAGIC_CHECK); 289 if (magic == NULL) { 290 (void)fprintf(stderr, "%s: %s\n", progname, 291 strerror(errno)); 292 return 1; 293 } 294 c = action == FILE_CHECK ? magic_check(magic, magicfile) : 295 magic_compile(magic, magicfile); 296 if (c == -1) { 297 (void)fprintf(stderr, "%s: %s\n", progname, 298 magic_error(magic)); 299 return 1; 300 } 301 return 0; 302 default: 303 if (magic == NULL) 304 if ((magic = load(magicfile, flags)) == NULL) 305 return 1; 306 break; 307 } 308 309 if (optind == argc) { 310 if (!didsomefiles) 311 usage(); 312 } 313 else { 314 size_t j, wid, nw; 315 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 316 nw = file_mbswidth(argv[j]); 317 if (nw > wid) 318 wid = nw; 319 } 320 /* 321 * If bflag is only set twice, set it depending on 322 * number of files [this is undocumented, and subject to change] 323 */ 324 if (bflag == 2) { 325 bflag = optind >= argc - 1; 326 } 327 for (; optind < argc; optind++) 328 e |= process(magic, argv[optind], wid); 329 } 330 331 if (magic) 332 magic_close(magic); 333 return e; 334 } 335 336 337 private struct magic_set * 338 /*ARGSUSED*/ 339 load(const char *magicfile, int flags) 340 { 341 struct magic_set *magic = magic_open(flags); 342 if (magic == NULL) { 343 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 344 return NULL; 345 } 346 if (magic_load(magic, magicfile) == -1) { 347 (void)fprintf(stderr, "%s: %s\n", 348 progname, magic_error(magic)); 349 magic_close(magic); 350 return NULL; 351 } 352 return magic; 353 } 354 355 /* 356 * unwrap -- read a file of filenames, do each one. 357 */ 358 private int 359 unwrap(struct magic_set *ms, const char *fn) 360 { 361 char buf[MAXPATHLEN]; 362 FILE *f; 363 int wid = 0, cwid; 364 int e = 0; 365 366 if (strcmp("-", fn) == 0) { 367 f = stdin; 368 wid = 1; 369 } else { 370 if ((f = fopen(fn, "r")) == NULL) { 371 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 372 progname, fn, strerror(errno)); 373 return 1; 374 } 375 376 while (fgets(buf, sizeof(buf), f) != NULL) { 377 buf[strcspn(buf, "\n")] = '\0'; 378 cwid = file_mbswidth(buf); 379 if (cwid > wid) 380 wid = cwid; 381 } 382 383 rewind(f); 384 } 385 386 while (fgets(buf, sizeof(buf), f) != NULL) { 387 buf[strcspn(buf, "\n")] = '\0'; 388 e |= process(ms, buf, wid); 389 if(nobuffer) 390 (void)fflush(stdout); 391 } 392 393 (void)fclose(f); 394 return e; 395 } 396 397 /* 398 * Called for each input file on the command line (or in a list of files) 399 */ 400 private int 401 process(struct magic_set *ms, const char *inname, int wid) 402 { 403 const char *type; 404 int std_in = strcmp(inname, "-") == 0; 405 406 if (wid > 0 && !bflag) { 407 (void)printf("%s", std_in ? "/dev/stdin" : inname); 408 if (nulsep) 409 (void)putc('\0', stdout); 410 else 411 (void)printf("%s", separator); 412 (void)printf("%*s ", 413 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 414 } 415 416 type = magic_file(ms, std_in ? NULL : inname); 417 if (type == NULL) { 418 (void)printf("ERROR: %s\n", magic_error(ms)); 419 return 1; 420 } else { 421 (void)printf("%s\n", type); 422 return 0; 423 } 424 } 425 426 size_t 427 file_mbswidth(const char *s) 428 { 429 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 430 size_t bytesconsumed, old_n, n, width = 0; 431 mbstate_t state; 432 wchar_t nextchar; 433 (void)memset(&state, 0, sizeof(mbstate_t)); 434 old_n = n = strlen(s); 435 436 while (n > 0) { 437 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 438 if (bytesconsumed == (size_t)(-1) || 439 bytesconsumed == (size_t)(-2)) { 440 /* Something went wrong, return something reasonable */ 441 return old_n; 442 } 443 if (s[0] == '\n') { 444 /* 445 * do what strlen() would do, so that caller 446 * is always right 447 */ 448 width++; 449 } else 450 width += wcwidth(nextchar); 451 452 s += bytesconsumed, n -= bytesconsumed; 453 } 454 return width; 455 #else 456 return strlen(s); 457 #endif 458 } 459 460 private void 461 usage(void) 462 { 463 (void)fprintf(stderr, USAGE, progname, progname, progname); 464 exit(1); 465 } 466 467 private void 468 help(void) 469 { 470 (void)fputs( 471 "Usage: file [OPTION...] [FILE...]\n" 472 "Determine type of FILEs.\n" 473 "\n", stderr); 474 #define OPT(shortname, longname, opt, doc) \ 475 fprintf(stderr, " -%c, --" longname doc, shortname); 476 #define OPT_LONGONLY(longname, opt, doc) \ 477 fprintf(stderr, " --" longname doc); 478 #include "file_opts.h" 479 #undef OPT 480 #undef OPT_LONGONLY 481 exit(0); 482 } 483