file.c revision 226048 
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 1.144 2011/05/10 17:08:14 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
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#ifdef S_IFLNK
74#define FILE_FLAGS "-bchikLlNnprsvz0"
75#else
76#define FILE_FLAGS "-bciklNnprsvz0"
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
87private 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
93private const char *separator = ":";	/* Default field separator	*/
94private 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:f:F:hiklLm:nNprsvz0"
105
106private 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 },
120};
121
122private char *progname;		/* used throughout 		*/
123
124private void usage(void);
125private void help(void);
126int main(int, char *[]);
127
128private int unwrap(struct magic_set *, const char *);
129private int process(struct magic_set *ms, const char *, int);
130private struct magic_set *load(const char *, int);
131
132
133/*
134 * main - parse arguments and handle options
135 */
136int
137main(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			for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++)
199				if (strcmp(nv[i].name, optarg) == 0)
200					break;
201
202			if (i == sizeof(nv) / sizeof(nv[0]))
203				errflg++;
204			else
205				flags |= nv[i].value;
206			break;
207
208		case 'f':
209			if(action)
210				usage();
211			if (magic == NULL)
212				if ((magic = load(magicfile, flags)) == NULL)
213					return 1;
214			e |= unwrap(magic, optarg);
215			++didsomefiles;
216			break;
217		case 'F':
218			separator = optarg;
219			break;
220		case 'i':
221			flags |= MAGIC_MIME;
222			break;
223		case 'k':
224			flags |= MAGIC_CONTINUE;
225			break;
226		case 'l':
227			action = FILE_LIST;
228			break;
229		case 'm':
230			magicfile = optarg;
231			break;
232		case 'n':
233			++nobuffer;
234			break;
235		case 'N':
236			++nopad;
237			break;
238#if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
239		case 'p':
240			flags |= MAGIC_PRESERVE_ATIME;
241			break;
242#endif
243		case 'r':
244			flags |= MAGIC_RAW;
245			break;
246		case 's':
247			flags |= MAGIC_DEVICES;
248			break;
249		case 'v':
250			if (magicfile == NULL)
251				magicfile = magic_getpath(magicfile, action);
252			(void)fprintf(stdout, "%s-%s\n", progname, VERSION);
253			(void)fprintf(stdout, "magic file from %s\n",
254				       magicfile);
255			return 1;
256		case 'z':
257			flags |= MAGIC_COMPRESS;
258			break;
259#ifdef S_IFLNK
260		case 'L':
261			flags |= MAGIC_SYMLINK;
262			break;
263		case 'h':
264			flags &= ~MAGIC_SYMLINK;
265			break;
266#endif
267		case '?':
268		default:
269			errflg++;
270			break;
271		}
272
273	if (errflg) {
274		usage();
275	}
276	if (e)
277		return e;
278
279	switch(action) {
280	case FILE_CHECK:
281	case FILE_COMPILE:
282	case FILE_LIST:
283		/*
284		 * Don't try to check/compile ~/.magic unless we explicitly
285		 * ask for it.
286		 */
287		magic = magic_open(flags|MAGIC_CHECK);
288		if (magic == NULL) {
289			(void)fprintf(stderr, "%s: %s\n", progname,
290			    strerror(errno));
291			return 1;
292		}
293		switch(action) {
294		case FILE_CHECK:
295			c = magic_check(magic, magicfile);
296			break;
297		case FILE_COMPILE:
298			c = magic_compile(magic, magicfile);
299			break;
300		case FILE_LIST:
301			c = magic_list(magic, magicfile);
302			break;
303		default:
304			abort();
305		}
306		if (c == -1) {
307			(void)fprintf(stderr, "%s: %s\n", progname,
308			    magic_error(magic));
309			return 1;
310		}
311		return 0;
312	default:
313		if (magic == NULL)
314			if ((magic = load(magicfile, flags)) == NULL)
315				return 1;
316		break;
317	}
318
319	if (optind == argc) {
320		if (!didsomefiles)
321			usage();
322	}
323	else {
324		size_t j, wid, nw;
325		for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) {
326			nw = file_mbswidth(argv[j]);
327			if (nw > wid)
328				wid = nw;
329		}
330		/*
331		 * If bflag is only set twice, set it depending on
332		 * number of files [this is undocumented, and subject to change]
333		 */
334		if (bflag == 2) {
335			bflag = optind >= argc - 1;
336		}
337		for (; optind < argc; optind++)
338			e |= process(magic, argv[optind], wid);
339	}
340
341	if (magic)
342		magic_close(magic);
343	return e;
344}
345
346
347private struct magic_set *
348/*ARGSUSED*/
349load(const char *magicfile, int flags)
350{
351	struct magic_set *magic = magic_open(flags);
352	if (magic == NULL) {
353		(void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
354		return NULL;
355	}
356	if (magic_load(magic, magicfile) == -1) {
357		(void)fprintf(stderr, "%s: %s\n",
358		    progname, magic_error(magic));
359		magic_close(magic);
360		return NULL;
361	}
362	return magic;
363}
364
365/*
366 * unwrap -- read a file of filenames, do each one.
367 */
368private int
369unwrap(struct magic_set *ms, const char *fn)
370{
371	FILE *f;
372	ssize_t len;
373	char *line = NULL;
374	size_t llen = 0;
375	int wid = 0, cwid;
376	int e = 0;
377
378	if (strcmp("-", fn) == 0) {
379		f = stdin;
380		wid = 1;
381	} else {
382		if ((f = fopen(fn, "r")) == NULL) {
383			(void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n",
384			    progname, fn, strerror(errno));
385			return 1;
386		}
387
388		while ((len = getline(&line, &llen, f)) > 0) {
389			if (line[len - 1] == '\n')
390				line[len - 1] = '\0';
391			cwid = file_mbswidth(line);
392			if (cwid > wid)
393				wid = cwid;
394		}
395
396		rewind(f);
397	}
398
399	while ((len = getline(&line, &llen, f)) > 0) {
400		if (line[len - 1] == '\n')
401			line[len - 1] = '\0';
402		e |= process(ms, line, wid);
403		if(nobuffer)
404			(void)fflush(stdout);
405	}
406
407	free(line);
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 */
415private int
416process(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		(void)printf("%s", separator);
426		(void)printf("%*s ",
427		    (int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
428	}
429
430	type = magic_file(ms, std_in ? NULL : inname);
431	if (type == NULL) {
432		(void)printf("ERROR: %s\n", magic_error(ms));
433		return 1;
434	} else {
435		(void)printf("%s\n", type);
436		return 0;
437	}
438}
439
440size_t
441file_mbswidth(const char *s)
442{
443#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
444	size_t bytesconsumed, old_n, n, width = 0;
445	mbstate_t state;
446	wchar_t nextchar;
447	(void)memset(&state, 0, sizeof(mbstate_t));
448	old_n = n = strlen(s);
449
450	while (n > 0) {
451		bytesconsumed = mbrtowc(&nextchar, s, n, &state);
452		if (bytesconsumed == (size_t)(-1) ||
453		    bytesconsumed == (size_t)(-2)) {
454			/* Something went wrong, return something reasonable */
455			return old_n;
456		}
457		if (s[0] == '\n') {
458			/*
459			 * do what strlen() would do, so that caller
460			 * is always right
461			 */
462			width++;
463		} else
464			width += wcwidth(nextchar);
465
466		s += bytesconsumed, n -= bytesconsumed;
467	}
468	return width;
469#else
470	return strlen(s);
471#endif
472}
473
474private void
475usage(void)
476{
477	(void)fprintf(stderr, USAGE, progname, progname, progname);
478	exit(1);
479}
480
481private void
482help(void)
483{
484	(void)fputs(
485"Usage: file [OPTION...] [FILE...]\n"
486"Determine type of FILEs.\n"
487"\n", stdout);
488#define OPT(shortname, longname, opt, doc)      \
489	fprintf(stdout, "  -%c, --" longname doc, shortname);
490#define OPT_LONGONLY(longname, opt, doc)        \
491	fprintf(stdout, "      --" longname doc);
492#include "file_opts.h"
493#undef OPT
494#undef OPT_LONGONLY
495	fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n");
496	exit(0);
497}
498