Annotation of src/usr.bin/file/file.c, Revision 1.18
1.18 ! chl 1: /* $OpenBSD: file.c,v 1.17 2007/02/19 13:02:08 tom Exp $ */
1.1 deraadt 2: /*
1.11 ian 3: * Copyright (c) Ian F. Darwin 1986-1995.
4: * Software written by Ian F. Darwin and others;
5: * maintained 1995-present by Christos Zoulas and others.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice immediately at the beginning of the file, without modification,
12: * this list of conditions, and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
1.1 deraadt 28: */
1.14 tedu 29: /*
30: * file - find type of a file or files - main program.
31: */
1.11 ian 32:
1.14 tedu 33: #include "file.h"
34: #include "magic.h"
1.1 deraadt 35:
36: #include <stdio.h>
37: #include <stdlib.h>
1.14 tedu 38: #include <unistd.h>
1.1 deraadt 39: #include <string.h>
40: #include <sys/types.h>
41: #include <sys/param.h> /* for MAXPATHLEN */
42: #include <sys/stat.h>
1.14 tedu 43: #ifdef RESTORE_TIME
44: # if (__COHERENT__ >= 0x420)
45: # include <sys/utime.h>
1.5 millert 46: # else
1.14 tedu 47: # ifdef USE_UTIMES
48: # include <sys/time.h>
49: # else
50: # include <utime.h>
51: # endif
1.5 millert 52: # endif
1.1 deraadt 53: #endif
1.14 tedu 54: #ifdef HAVE_UNISTD_H
1.1 deraadt 55: #include <unistd.h> /* for read() */
1.14 tedu 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: #ifdef HAVE_GETOPT_H
65: #include <getopt.h> /* for long options (is this portable?)*/
66: #else
67: #undef HAVE_GETOPT_LONG
68: #endif
1.1 deraadt 69:
1.5 millert 70: #include <netinet/in.h> /* for byte swapping */
1.1 deraadt 71:
72: #include "patchlevel.h"
1.14 tedu 73:
74: #ifndef lint
1.18 ! chl 75: FILE_RCSID("@(#)$Id: file.c,v 1.17 2007/02/19 13:02:08 tom Exp $")
1.14 tedu 76: #endif /* lint */
77:
1.1 deraadt 78:
79: #ifdef S_IFLNK
1.18 ! chl 80: #define SYMLINKFLAG "Lh"
1.1 deraadt 81: #else
1.14 tedu 82: #define SYMLINKFLAG ""
1.1 deraadt 83: #endif
84:
1.18 ! chl 85: # define USAGE "Usage: %s [-bck" SYMLINKFLAG "nNrsvz0] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...\n" \
! 86: " %s [-m magicfiles] -C\n"
1.14 tedu 87:
88: #ifndef MAXPATHLEN
89: #define MAXPATHLEN 512
1.1 deraadt 90: #endif
91:
1.14 tedu 92: private int /* Global command-line options */
93: bflag = 0, /* brief output format */
94: nopad = 0, /* Don't pad output */
1.18 ! chl 95: nobuffer = 0, /* Do not buffer stdout */
! 96: nulsep = 0; /* Append '\0' to the separator */
1.14 tedu 97:
98: private const char *magicfile = 0; /* where the magic is */
99: private const char *default_magicfile = MAGIC;
1.18 ! chl 100: private const char *separator = ":"; /* Default field separator */
1.14 tedu 101:
102: private struct magic_set *magic;
1.18 ! chl 103: extern char *__progname;
1.14 tedu 104:
105: private void unwrap(char *);
106: private void usage(void);
107: #ifdef HAVE_GETOPT_LONG
108: private void help(void);
109: #endif
110: #if 0
111: private int byteconv4(int, int, int);
112: private short byteconv2(int, int, int);
113: #endif
1.1 deraadt 114:
1.14 tedu 115: int main(int, char *[]);
116: private void process(const char *, int);
117: private void load(const char *, int);
1.1 deraadt 118:
119:
120: /*
121: * main - parse arguments and handle options
122: */
123: int
1.13 deraadt 124: main(int argc, char *argv[])
1.1 deraadt 125: {
1.18 ! chl 126: int c, i;
1.14 tedu 127: int action = 0, didsomefiles = 0, errflg = 0;
128: int flags = 0;
129: char *home, *usermagic;
130: struct stat sb;
1.18 ! chl 131: static const char hmagic[] = "/.magic";
! 132: #define OPTSTRING "bcCde:f:F:hkLm:nNprsvz0"
1.14 tedu 133: #ifdef HAVE_GETOPT_LONG
134: int longindex;
1.18 ! chl 135: static const struct option long_options[] =
1.14 tedu 136: {
137: {"version", 0, 0, 'v'},
138: {"help", 0, 0, 0},
139: {"brief", 0, 0, 'b'},
140: {"checking-printout", 0, 0, 'c'},
141: {"debug", 0, 0, 'd'},
1.18 ! chl 142: {"exclude", 1, 0, 'e' },
1.14 tedu 143: {"files-from", 1, 0, 'f'},
144: {"separator", 1, 0, 'F'},
145: {"keep-going", 0, 0, 'k'},
146: #ifdef S_IFLNK
147: {"dereference", 0, 0, 'L'},
1.18 ! chl 148: {"no-dereference", 0, 0, 'h'},
1.14 tedu 149: #endif
150: {"magic-file", 1, 0, 'm'},
151: #if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
152: {"preserve-date", 0, 0, 'p'},
153: #endif
154: {"uncompress", 0, 0, 'z'},
155: {"raw", 0, 0, 'r'},
156: {"no-buffer", 0, 0, 'n'},
157: {"no-pad", 0, 0, 'N'},
158: {"special-files", 0, 0, 's'},
159: {"compile", 0, 0, 'C'},
1.18 ! chl 160: {"print0", 0, 0, '0'},
1.14 tedu 161: {0, 0, 0, 0},
162: };
163: #endif
164:
1.18 ! chl 165: static const struct {
! 166: const char *name;
! 167: int value;
! 168: } nv[] = {
! 169: { "apptype", MAGIC_NO_CHECK_APPTYPE },
! 170: { "ascii", MAGIC_NO_CHECK_ASCII },
! 171: { "compress", MAGIC_NO_CHECK_COMPRESS },
! 172: { "elf", MAGIC_NO_CHECK_ELF },
! 173: { "fortran", MAGIC_NO_CHECK_FORTRAN },
! 174: { "soft", MAGIC_NO_CHECK_SOFT },
! 175: { "tar", MAGIC_NO_CHECK_TAR },
! 176: { "tokens", MAGIC_NO_CHECK_TOKENS },
! 177: { "troff", MAGIC_NO_CHECK_TROFF },
! 178: };
! 179:
1.14 tedu 180: #ifdef LC_CTYPE
1.18 ! chl 181: /* makes islower etc work for other langs */
! 182: (void)setlocale(LC_CTYPE, "");
1.14 tedu 183: #endif
1.1 deraadt 184:
1.14 tedu 185: #ifdef __EMX__
186: /* sh-like wildcard expansion! Shouldn't hurt at least ... */
187: _wildcard(&argc, &argv);
188: #endif
1.1 deraadt 189:
1.14 tedu 190: magicfile = default_magicfile;
191: if ((usermagic = getenv("MAGIC")) != NULL)
192: magicfile = usermagic;
193: else
194: if ((home = getenv("HOME")) != NULL) {
1.18 ! chl 195: size_t len = strlen(home) + sizeof(hmagic);
1.14 tedu 196: if ((usermagic = malloc(len)) != NULL) {
197: (void)strlcpy(usermagic, home, len);
1.18 ! chl 198: (void)strlcat(usermagic, hmagic, len);
1.14 tedu 199: if (stat(usermagic, &sb)<0)
200: free(usermagic);
201: else
202: magicfile = usermagic;
203: }
204: }
205:
1.18 ! chl 206: #ifdef S_IFLNK
! 207: flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0;
! 208: #endif
1.14 tedu 209: #ifndef HAVE_GETOPT_LONG
210: while ((c = getopt(argc, argv, OPTSTRING)) != -1)
211: #else
212: while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
213: &longindex)) != -1)
214: #endif
1.1 deraadt 215: switch (c) {
1.14 tedu 216: #ifdef HAVE_GETOPT_LONG
217: case 0 :
218: if (longindex == 1)
219: help();
220: break;
221: #endif
1.18 ! chl 222: case '0':
! 223: nulsep = 1;
! 224: break;
1.9 millert 225: case 'b':
226: ++bflag;
227: break;
1.1 deraadt 228: case 'c':
1.14 tedu 229: action = FILE_CHECK;
230: break;
231: case 'C':
232: action = FILE_COMPILE;
1.1 deraadt 233: break;
234: case 'd':
1.14 tedu 235: flags |= MAGIC_DEBUG|MAGIC_CHECK;
1.1 deraadt 236: break;
1.18 ! chl 237: case 'e':
! 238: for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++)
! 239: if (strcmp(nv[i].name, optarg) == 0)
! 240: break;
! 241:
! 242: if (i == sizeof(nv) / sizeof(nv[0]))
! 243: errflg++;
! 244: else
! 245: flags |= nv[i].value;
! 246: break;
! 247:
1.1 deraadt 248: case 'f':
1.14 tedu 249: if(action)
250: usage();
251: load(magicfile, flags);
1.1 deraadt 252: unwrap(optarg);
253: ++didsomefiles;
254: break;
1.14 tedu 255: case 'F':
256: separator = optarg;
257: break;
258: case 'k':
259: flags |= MAGIC_CONTINUE;
1.1 deraadt 260: break;
261: case 'm':
262: magicfile = optarg;
263: break;
1.14 tedu 264: case 'n':
265: ++nobuffer;
266: break;
267: case 'N':
268: ++nopad;
269: break;
270: #if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
271: case 'p':
272: flags |= MAGIC_PRESERVE_ATIME;
273: break;
274: #endif
275: case 'r':
276: flags |= MAGIC_RAW;
277: break;
278: case 's':
279: flags |= MAGIC_DEVICES;
280: break;
281: case 'v':
1.18 ! chl 282: (void)fprintf(stdout, "%s-%d.%.2d\n", __progname,
1.14 tedu 283: FILE_VERSION_MAJOR, patchlevel);
1.18 ! chl 284: (void)fprintf(stdout, "magic file from %s\n",
1.14 tedu 285: magicfile);
286: return 1;
1.1 deraadt 287: case 'z':
1.14 tedu 288: flags |= MAGIC_COMPRESS;
1.1 deraadt 289: break;
1.14 tedu 290: #ifdef S_IFLNK
291: case 'L':
292: flags |= MAGIC_SYMLINK;
293: break;
1.18 ! chl 294: case 'h':
! 295: flags &= ~MAGIC_SYMLINK;
! 296: break;
1.14 tedu 297: #endif
1.1 deraadt 298: case '?':
299: default:
300: errflg++;
301: break;
302: }
303:
304: if (errflg) {
1.14 tedu 305: usage();
1.1 deraadt 306: }
307:
1.14 tedu 308: switch(action) {
309: case FILE_CHECK:
310: case FILE_COMPILE:
311: magic = magic_open(flags|MAGIC_CHECK);
312: if (magic == NULL) {
1.18 ! chl 313: (void)fprintf(stderr, "%s: %s\n", __progname,
1.14 tedu 314: strerror(errno));
315: return 1;
316: }
317: c = action == FILE_CHECK ? magic_check(magic, magicfile) :
318: magic_compile(magic, magicfile);
319: if (c == -1) {
1.18 ! chl 320: (void)fprintf(stderr, "%s: %s\n", __progname,
1.14 tedu 321: magic_error(magic));
322: return -1;
323: }
324: return 0;
325: default:
326: load(magicfile, flags);
327: break;
1.1 deraadt 328: }
329:
330: if (optind == argc) {
1.7 deraadt 331: if (!didsomefiles) {
1.14 tedu 332: usage();
1.7 deraadt 333: }
1.14 tedu 334: }
335: else {
1.1 deraadt 336: int i, wid, nw;
337: for (wid = 0, i = optind; i < argc; i++) {
1.14 tedu 338: nw = file_mbswidth(argv[i]);
1.1 deraadt 339: if (nw > wid)
340: wid = nw;
341: }
342: for (; optind < argc; optind++)
343: process(argv[optind], wid);
344: }
345:
1.18 ! chl 346: magic_close(magic);
1.1 deraadt 347: return 0;
348: }
349:
350:
1.14 tedu 351: private void
1.18 ! chl 352: /*ARGSUSED*/
1.14 tedu 353: load(const char *m, int flags)
354: {
1.18 ! chl 355: if (magic || m == NULL)
1.14 tedu 356: return;
357: magic = magic_open(flags);
358: if (magic == NULL) {
1.18 ! chl 359: (void)fprintf(stderr, "%s: %s\n", __progname, strerror(errno));
1.14 tedu 360: exit(1);
361: }
362: if (magic_load(magic, magicfile) == -1) {
363: (void)fprintf(stderr, "%s: %s\n",
1.18 ! chl 364: __progname, magic_error(magic));
1.14 tedu 365: exit(1);
366: }
367: }
368:
1.1 deraadt 369: /*
370: * unwrap -- read a file of filenames, do each one.
371: */
1.14 tedu 372: private void
373: unwrap(char *fn)
1.1 deraadt 374: {
375: char buf[MAXPATHLEN];
376: FILE *f;
377: int wid = 0, cwid;
378:
1.5 millert 379: if (strcmp("-", fn) == 0) {
380: f = stdin;
381: wid = 1;
382: } else {
383: if ((f = fopen(fn, "r")) == NULL) {
1.14 tedu 384: (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n",
1.18 ! chl 385: __progname, fn, strerror(errno));
1.14 tedu 386: exit(1);
1.5 millert 387: }
388:
1.15 otto 389: while (fgets(buf, sizeof(buf), f) != NULL) {
1.18 ! chl 390: buf[strcspn(buf, "\n")] = '\0';
! 391: cwid = file_mbswidth(buf);
1.5 millert 392: if (cwid > wid)
393: wid = cwid;
394: }
1.1 deraadt 395:
1.5 millert 396: rewind(f);
1.1 deraadt 397: }
398:
1.15 otto 399: while (fgets(buf, sizeof(buf), f) != NULL) {
1.18 ! chl 400: buf[strcspn(buf, "\n")] = '\0';
1.1 deraadt 401: process(buf, wid);
1.14 tedu 402: if(nobuffer)
1.18 ! chl 403: (void)fflush(stdout);
1.1 deraadt 404: }
405:
1.18 ! chl 406: (void)fclose(f);
1.1 deraadt 407: }
408:
1.18 ! chl 409: /*
! 410: * Called for each input file on the command line (or in a list of files)
! 411: */
1.14 tedu 412: private void
413: process(const char *inname, int wid)
414: {
415: const char *type;
416: int std_in = strcmp(inname, "-") == 0;
417:
1.18 ! chl 418: if (wid > 0 && !bflag) {
! 419: (void)printf("%s", std_in ? "/dev/stdin" : inname);
! 420: if (nulsep)
! 421: (void)putc('\0', stdout);
! 422: else
! 423: (void)printf("%s", separator);
! 424: (void)printf("%*s ",
! 425: (int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
! 426: }
1.14 tedu 427:
428: type = magic_file(magic, std_in ? NULL : inname);
429: if (type == NULL)
1.18 ! chl 430: (void)printf("ERROR: %s\n", magic_error(magic));
1.14 tedu 431: else
1.18 ! chl 432: (void)printf("%s\n", type);
1.14 tedu 433: }
434:
1.1 deraadt 435:
1.5 millert 436: #if 0
437: /*
438: * byteconv4
439: * Input:
440: * from 4 byte quantity to convert
441: * same whether to perform byte swapping
442: * big_endian whether we are a big endian host
443: */
1.14 tedu 444: private int
445: byteconv4(int from, int same, int big_endian)
1.5 millert 446: {
1.14 tedu 447: if (same)
448: return from;
449: else if (big_endian) { /* lsb -> msb conversion on msb */
450: union {
451: int i;
452: char c[4];
453: } retval, tmpval;
454:
455: tmpval.i = from;
456: retval.c[0] = tmpval.c[3];
457: retval.c[1] = tmpval.c[2];
458: retval.c[2] = tmpval.c[1];
459: retval.c[3] = tmpval.c[0];
460:
461: return retval.i;
462: }
463: else
464: return ntohl(from); /* msb -> lsb conversion on lsb */
1.5 millert 465: }
466:
467: /*
468: * byteconv2
469: * Same as byteconv4, but for shorts
470: */
1.14 tedu 471: private short
472: byteconv2(int from, int same, int big_endian)
1.5 millert 473: {
1.14 tedu 474: if (same)
475: return from;
476: else if (big_endian) { /* lsb -> msb conversion on msb */
477: union {
478: short s;
479: char c[2];
480: } retval, tmpval;
481:
482: tmpval.s = (short) from;
483: retval.c[0] = tmpval.c[1];
484: retval.c[1] = tmpval.c[0];
485:
486: return retval.s;
487: }
488: else
489: return ntohs(from); /* msb -> lsb conversion on lsb */
1.5 millert 490: }
491: #endif
492:
1.14 tedu 493: size_t
494: file_mbswidth(const char *s)
1.1 deraadt 495: {
1.18 ! chl 496: #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
1.14 tedu 497: size_t bytesconsumed, old_n, n, width = 0;
498: mbstate_t state;
499: wchar_t nextchar;
500: (void)memset(&state, 0, sizeof(mbstate_t));
501: old_n = n = strlen(s);
502:
503: while (n > 0) {
504: bytesconsumed = mbrtowc(&nextchar, s, n, &state);
505: if (bytesconsumed == (size_t)(-1) ||
506: bytesconsumed == (size_t)(-2)) {
507: /* Something went wrong, return something reasonable */
508: return old_n;
1.1 deraadt 509: }
1.14 tedu 510: if (s[0] == '\n') {
511: /*
512: * do what strlen() would do, so that caller
513: * is always right
514: */
515: width++;
516: } else
517: width += wcwidth(nextchar);
1.1 deraadt 518:
1.14 tedu 519: s += bytesconsumed, n -= bytesconsumed;
1.1 deraadt 520: }
1.14 tedu 521: return width;
522: #else
523: return strlen(s);
1.5 millert 524: #endif
1.14 tedu 525: }
1.1 deraadt 526:
1.14 tedu 527: private void
528: usage(void)
529: {
1.18 ! chl 530: (void)fprintf(stderr, USAGE, __progname, __progname);
1.14 tedu 531: #ifdef HAVE_GETOPT_LONG
532: (void)fputs("Try `file --help' for more information.\n", stderr);
1.1 deraadt 533: #endif
1.14 tedu 534: exit(1);
1.1 deraadt 535: }
536:
1.14 tedu 537: #ifdef HAVE_GETOPT_LONG
538: private void
539: help(void)
1.1 deraadt 540: {
1.18 ! chl 541: (void)puts(
1.14 tedu 542: "Usage: file [OPTION]... [FILE]...\n"
543: "Determine file type of FILEs.\n"
544: "\n"
545: " -m, --magic-file LIST use LIST as a colon-separated list of magic\n"
546: " number files\n"
547: " -z, --uncompress try to look inside compressed files\n"
548: " -b, --brief do not prepend filenames to output lines\n"
549: " -c, --checking-printout print the parsed form of the magic file, use in\n"
550: " conjunction with -m to debug a new magic file\n"
551: " before installing it\n"
1.18 ! chl 552: " -e, --exclude exclude test from the list of test to be\n"
! 553: " performed for file. Valid tests are:\n"
! 554: " ascii, apptype, elf, compress, soft, tar\n"
1.14 tedu 555: " -f, --files-from FILE read the filenames to be examined from FILE\n"
556: " -F, --separator string use string as separator instead of `:'\n"
557: " -k, --keep-going don't stop at the first match\n"
558: " -L, --dereference causes symlinks to be followed\n"
559: " -n, --no-buffer do not buffer output\n"
560: " -N, --no-pad do not pad output\n"
561: " -p, --preserve-date preserve access times on files\n"
562: " -r, --raw don't translate unprintable chars to \\ooo\n"
563: " -s, --special-files treat special (block/char devices) files as\n"
564: " ordinary ones\n"
1.18 ! chl 565: "or\n"
1.14 tedu 566: " --help display this help and exit\n"
1.18 ! chl 567: "or\n"
1.14 tedu 568: " --version output version information and exit\n"
1.18 ! chl 569: "or\n"
! 570: " -C, --compile compile file specified by -m\n"
1.14 tedu 571: );
572: exit(0);
1.1 deraadt 573: }
1.14 tedu 574: #endif
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