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 35FILE_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 67int 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 __APPLE__ 76#include "get_compat.h" 77#else 78#define COMPAT_MODE(func, mode) 1 79#endif 80 81#ifdef S_IFLNK 82#define FILE_FLAGS "-bchikLNnprsvz0" 83#else 84#define FILE_FLAGS "-bcikNnprsvz0" 85#endif 86 87# define USAGE "Usage: %s [" FILE_FLAGS "] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...\n %s -C -m magicfiles\n" 88# define USAGE03 "Usage: %s [" FILE_FLAGS "] [-e test] [-f namefile] [-F separator] [-m magicfiles] [-M magicfiles] file...\n %s -C -m magicfiles\n" 89 90#ifndef MAXPATHLEN 91#define MAXPATHLEN 1024 92#endif 93 94private int /* Global command-line options */ 95 bflag = 0, /* brief output format */ 96 nopad = 0, /* Don't pad output */ 97 nobuffer = 0, /* Do not buffer stdout */ 98 nulsep = 0; /* Append '\0' to the separator */ 99 100private const char *separator = ":"; /* Default field separator */ 101private const struct option long_options[] = { 102#define OPT(shortname, longname, opt, doc) \ 103 {longname, opt, NULL, shortname}, 104#define OPT_LONGONLY(longname, opt, doc) \ 105 {longname, opt, NULL, 0}, 106#define OPT_UNIX03(shortname, doc) 107#include "file_opts.h" 108#undef OPT 109#undef OPT_LONGONLY 110#undef OPT_UNIX03 111 {0, 0, NULL, 0} 112}; 113#define OPTSTRING "bcCde:f:F:hikLm:nNprsvz0" 114#define OPTSTRING03 "bcCdDe:f:F:hiIkLm:M:nNprsvz0" 115 116private const struct { 117 const char *name; 118 int value; 119} nv[] = { 120 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 121 { "ascii", MAGIC_NO_CHECK_ASCII }, 122 { "cdf", MAGIC_NO_CHECK_CDF }, 123 { "compress", MAGIC_NO_CHECK_COMPRESS }, 124 { "elf", MAGIC_NO_CHECK_ELF }, 125 { "encoding", MAGIC_NO_CHECK_ENCODING }, 126 { "soft", MAGIC_NO_CHECK_SOFT }, 127 { "tar", MAGIC_NO_CHECK_TAR }, 128 { "tokens", MAGIC_NO_CHECK_TOKENS }, 129}; 130 131private char *progname; /* used throughout */ 132 133private void usage(void); 134private void help(void); 135int main(int, char *[]); 136 137private int unwrap(struct magic_set *, const char *); 138private int process(struct magic_set *ms, const char *, int); 139private struct magic_set *load(const char *, int); 140 141 142/* 143 * main - parse arguments and handle options 144 */ 145int 146main(int argc, char *argv[]) 147{ 148 int c; 149 size_t i; 150 int action = 0, didsomefiles = 0, errflg = 0; 151 int flags = 0, e = 0; 152 struct magic_set *magic = NULL; 153 int longindex; 154 int dflag = 0; /* POSIX 'd' option -- use default magic file */ 155 int Mflag = 0; 156 int unix03 = COMPAT_MODE("bin/file", "unix2003"); 157 const char *magicfile = NULL; /* where the magic is */ 158 159 /* makes islower etc work for other langs */ 160 (void)setlocale(LC_CTYPE, ""); 161 162#ifdef __EMX__ 163 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 164 _wildcard(&argc, &argv); 165#endif 166 167 if ((progname = strrchr(argv[0], '/')) != NULL) 168 progname++; 169 else 170 progname = argv[0]; 171 172#ifdef S_IFLNK 173 flags |= (unix03 || getenv("POSIXLY_CORRECT")) ? (MAGIC_SYMLINK) : 0; 174#endif 175 if (unix03) flags |= MAGIC_RAW; /* See 5747343. */ 176 while ((c = getopt_long(argc, argv, unix03 ? OPTSTRING03 : 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 if (unix03) { 209 ++dflag; 210 break; 211 } 212 case 'D': 213 flags |= MAGIC_DEBUG|MAGIC_CHECK; 214 break; 215 case 'e': 216 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) 217 if (strcmp(nv[i].name, optarg) == 0) 218 break; 219 220 if (i == sizeof(nv) / sizeof(nv[0])) 221 errflg++; 222 else 223 flags |= nv[i].value; 224 break; 225 226 case 'f': 227 if(action) 228 usage(); 229 if (magic == NULL) 230 if ((magic = load(magicfile, flags)) == NULL) 231 return 1; 232 e |= unwrap(magic, optarg); 233 ++didsomefiles; 234 break; 235 case 'F': 236 separator = optarg; 237 break; 238 case 'i': 239 if (unix03) { 240 flags |= MAGIC_REGULAR; 241 break; 242 } 243 case 'I': 244 flags |= MAGIC_MIME; 245 break; 246 case 'k': 247 flags |= MAGIC_CONTINUE; 248 break; 249 case 'M': 250 ++Mflag; 251 case 'm': 252 { 253 if (magicfile == NULL) 254 magicfile = magic_getpath(magicfile, action); 255 char *newmagicfile = malloc(strlen(magicfile) + strlen(separator) + strlen(optarg) + 1); 256 strcpy(newmagicfile, magicfile); 257 strcat(newmagicfile, separator); 258 strcat(newmagicfile, optarg); 259 magicfile = newmagicfile; 260 } 261 break; 262 case 'n': 263 ++nobuffer; 264 break; 265 case 'N': 266 ++nopad; 267 break; 268#if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 269 case 'p': 270 flags |= MAGIC_PRESERVE_ATIME; 271 break; 272#endif 273 case 'r': 274 flags |= MAGIC_RAW; 275 break; 276 case 's': 277 flags |= MAGIC_DEVICES; 278 break; 279 case 'v': 280 if (magicfile == NULL) 281 magicfile = magic_getpath(magicfile, action); 282 (void)fprintf(stderr, "%s-%d.%.2d\n", progname, 283 FILE_VERSION_MAJOR, patchlevel); 284 (void)fprintf(stderr, "magic file from %s\n", 285 magicfile); 286 return 1; 287 case 'z': 288 flags |= MAGIC_COMPRESS; 289 break; 290#ifdef S_IFLNK 291 case 'L': 292 flags |= MAGIC_SYMLINK; 293 break; 294 case 'h': 295 flags &= ~MAGIC_SYMLINK; 296 break; 297#endif 298 case '?': 299 default: 300 errflg++; 301 break; 302 } 303 304 if (errflg) { 305 usage(); 306 } 307 if (e) 308 return e; 309 310 if (Mflag && !dflag) { 311 flags |= MAGIC_NO_CHECK_ASCII; 312 } 313 314 switch(action) { 315 case FILE_CHECK: 316 case FILE_COMPILE: 317 /* 318 * Don't try to check/compile ~/.magic unless we explicitly 319 * ask for it. 320 */ 321 magic = magic_open(flags|MAGIC_CHECK); 322 if (magic == NULL) { 323 (void)fprintf(stderr, "%s: %s\n", progname, 324 strerror(errno)); 325 return 1; 326 } 327 c = action == FILE_CHECK ? magic_check(magic, magicfile) : 328 magic_compile(magic, magicfile); 329 if (c == -1) { 330 (void)fprintf(stderr, "%s: %s\n", progname, 331 magic_error(magic)); 332 return 1; 333 } 334 return 0; 335 default: 336 if (magic == NULL) 337 if ((magic = load(magicfile, flags)) == NULL) 338 return 1; 339 break; 340 } 341 342 if (optind == argc) { 343 if (!didsomefiles) 344 usage(); 345 } 346 else { 347 size_t j, wid, nw; 348 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) { 349 nw = file_mbswidth(argv[j]); 350 if (nw > wid) 351 wid = nw; 352 } 353 /* 354 * If bflag is only set twice, set it depending on 355 * number of files [this is undocumented, and subject to change] 356 */ 357 if (bflag == 2) { 358 bflag = optind >= argc - 1; 359 } 360 for (; optind < argc; optind++) 361 e |= process(magic, argv[optind], wid); 362 } 363 364 if (magic) 365 magic_close(magic); 366 return e; 367} 368 369 370private struct magic_set * 371/*ARGSUSED*/ 372load(const char *magicfile, int flags) 373{ 374 struct magic_set *magic = magic_open(flags); 375 if (magic == NULL) { 376 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno)); 377 return NULL; 378 } 379 if (magic_load(magic, magicfile) == -1) { 380 (void)fprintf(stderr, "%s: %s\n", 381 progname, magic_error(magic)); 382 magic_close(magic); 383 return NULL; 384 } 385 return magic; 386} 387 388/* 389 * unwrap -- read a file of filenames, do each one. 390 */ 391private int 392unwrap(struct magic_set *ms, const char *fn) 393{ 394 char buf[MAXPATHLEN]; 395 FILE *f; 396 int wid = 0, cwid; 397 int e = 0; 398 399 if (strcmp("-", fn) == 0) { 400 f = stdin; 401 wid = 1; 402 } else { 403 if ((f = fopen(fn, "r")) == NULL) { 404 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n", 405 progname, fn, strerror(errno)); 406 return 1; 407 } 408 409 while (fgets(buf, sizeof(buf), f) != NULL) { 410 buf[strcspn(buf, "\n")] = '\0'; 411 cwid = file_mbswidth(buf); 412 if (cwid > wid) 413 wid = cwid; 414 } 415 416 rewind(f); 417 } 418 419 while (fgets(buf, sizeof(buf), f) != NULL) { 420 buf[strcspn(buf, "\n")] = '\0'; 421 e |= process(ms, buf, wid); 422 if(nobuffer) 423 (void)fflush(stdout); 424 } 425 426 (void)fclose(f); 427 return e; 428} 429 430/* 431 * Called for each input file on the command line (or in a list of files) 432 */ 433private int 434process(struct magic_set *ms, const char *inname, int wid) 435{ 436 const char *type; 437 int std_in = strcmp(inname, "-") == 0; 438 439 if (wid > 0 && !bflag) { 440 (void)printf("%s", std_in ? "/dev/stdin" : inname); 441 if (nulsep) 442 (void)putc('\0', stdout); 443 else 444 (void)printf("%s", separator); 445 (void)printf("%*s ", 446 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), ""); 447 } 448 449 type = magic_file(ms, std_in ? NULL : inname); 450 if (type == NULL) { 451 (void)printf("ERROR: %s\n", magic_error(ms)); 452 return 1; 453 } else { 454 (void)printf("%s\n", type); 455 return 0; 456 } 457} 458 459size_t 460file_mbswidth(const char *s) 461{ 462#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) 463 size_t bytesconsumed, old_n, n, width = 0; 464 mbstate_t state; 465 wchar_t nextchar; 466 (void)memset(&state, 0, sizeof(mbstate_t)); 467 old_n = n = strlen(s); 468 469 while (n > 0) { 470 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 471 if (bytesconsumed == (size_t)(-1) || 472 bytesconsumed == (size_t)(-2)) { 473 /* Something went wrong, return something reasonable */ 474 return old_n; 475 } 476 if (s[0] == '\n') { 477 /* 478 * do what strlen() would do, so that caller 479 * is always right 480 */ 481 width++; 482 } else 483 width += wcwidth(nextchar); 484 485 s += bytesconsumed, n -= bytesconsumed; 486 } 487 return width; 488#else 489 return strlen(s); 490#endif 491} 492 493private void 494usage(void) 495{ 496 (void)fprintf(stderr, COMPAT_MODE("bin/file", "unix2003") ? USAGE03 : USAGE, progname, progname); 497 (void)fputs("Try `file --help' for more information.\n", stderr); 498 exit(1); 499} 500 501private void 502help(void) 503{ 504 int unix03 = COMPAT_MODE("bin/file", "unix2003"); 505 (void)fputs( 506"Usage: file [OPTION...] [FILE...]\n" 507"Determine type of FILEs.\n" 508"\n", stderr); 509#define OPT(shortname, longname, opt, doc) \ 510 fprintf(stderr, " -%c, --" longname doc, unix03 || (shortname != 'D' && shortname != 'I') ? shortname : shortname + 32); 511#define OPT_LONGONLY(longname, opt, doc) \ 512 fprintf(stderr, " --" longname doc); 513#define OPT_UNIX03(shortname, doc) \ 514 if (unix03) fprintf(stderr, " -%c" doc, shortname); 515#include "file_opts.h" 516#undef OPT 517#undef OPT_LONGONLY 518#undef OPT_UNIX03 519 exit(0); 520} 521