unzip.c revision 294107 
1/*-
2 * Copyright (c) 2009, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
3 * Copyright (c) 2007-2008 Dag-Erling Sm��rgrav
4 * All rights reserved.
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, this list of conditions and the following disclaimer
11 *    in this position and unchanged.
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
20 * FOR 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 * $FreeBSD: head/usr.bin/unzip/unzip.c 294107 2016-01-15 22:58:23Z ak $
29 *
30 * This file would be much shorter if we didn't care about command-line
31 * compatibility with Info-ZIP's UnZip, which requires us to duplicate
32 * parts of libarchive in order to gain more detailed control of its
33 * behaviour for the purpose of implementing the -n, -o, -L and -a
34 * options.
35 */
36
37#include <sys/queue.h>
38#include <sys/stat.h>
39
40#include <ctype.h>
41#include <errno.h>
42#include <fcntl.h>
43#include <fnmatch.h>
44#include <stdarg.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49
50#include <archive.h>
51#include <archive_entry.h>
52
53/* command-line options */
54static int		 a_opt;		/* convert EOL */
55static int		 C_opt;		/* match case-insensitively */
56static int		 c_opt;		/* extract to stdout */
57static const char	*d_arg;		/* directory */
58static int		 f_opt;		/* update existing files only */
59static int		 j_opt;		/* junk directories */
60static int		 L_opt;		/* lowercase names */
61static int		 n_opt;		/* never overwrite */
62static int		 o_opt;		/* always overwrite */
63static int		 p_opt;		/* extract to stdout, quiet */
64static int		 q_opt;		/* quiet */
65static int		 t_opt;		/* test */
66static int		 u_opt;		/* update */
67static int		 v_opt;		/* verbose/list */
68static const char	*y_str = "";	/* 4 digit year */
69static int		 Z1_opt;	/* zipinfo mode list files only */
70
71/* debug flag */
72static int		 unzip_debug;
73
74/* zipinfo mode */
75static int		 zipinfo_mode;
76
77/* running on tty? */
78static int		 tty;
79
80/* convenience macro */
81/* XXX should differentiate between ARCHIVE_{WARN,FAIL,RETRY} */
82#define ac(call)						\
83	do {							\
84		int acret = (call);				\
85		if (acret != ARCHIVE_OK)			\
86			errorx("%s", archive_error_string(a));	\
87	} while (0)
88
89/*
90 * Indicates that last info() did not end with EOL.  This helps error() et
91 * al. avoid printing an error message on the same line as an incomplete
92 * informational message.
93 */
94static int noeol;
95
96/* fatal error message + errno */
97static void
98error(const char *fmt, ...)
99{
100	va_list ap;
101
102	if (noeol)
103		fprintf(stdout, "\n");
104	fflush(stdout);
105	fprintf(stderr, "unzip: ");
106	va_start(ap, fmt);
107	vfprintf(stderr, fmt, ap);
108	va_end(ap);
109	fprintf(stderr, ": %s\n", strerror(errno));
110	exit(1);
111}
112
113/* fatal error message, no errno */
114static void
115errorx(const char *fmt, ...)
116{
117	va_list ap;
118
119	if (noeol)
120		fprintf(stdout, "\n");
121	fflush(stdout);
122	fprintf(stderr, "unzip: ");
123	va_start(ap, fmt);
124	vfprintf(stderr, fmt, ap);
125	va_end(ap);
126	fprintf(stderr, "\n");
127	exit(1);
128}
129
130/* non-fatal error message + errno */
131static void
132warning(const char *fmt, ...)
133{
134	va_list ap;
135
136	if (noeol)
137		fprintf(stdout, "\n");
138	fflush(stdout);
139	fprintf(stderr, "unzip: ");
140	va_start(ap, fmt);
141	vfprintf(stderr, fmt, ap);
142	va_end(ap);
143	fprintf(stderr, ": %s\n", strerror(errno));
144}
145
146/* non-fatal error message, no errno */
147static void
148warningx(const char *fmt, ...)
149{
150	va_list ap;
151
152	if (noeol)
153		fprintf(stdout, "\n");
154	fflush(stdout);
155	fprintf(stderr, "unzip: ");
156	va_start(ap, fmt);
157	vfprintf(stderr, fmt, ap);
158	va_end(ap);
159	fprintf(stderr, "\n");
160}
161
162/* informational message (if not -q) */
163static void
164info(const char *fmt, ...)
165{
166	va_list ap;
167
168	if (q_opt && !unzip_debug)
169		return;
170	va_start(ap, fmt);
171	vfprintf(stdout, fmt, ap);
172	va_end(ap);
173	fflush(stdout);
174
175	if (*fmt == '\0')
176		noeol = 1;
177	else
178		noeol = fmt[strlen(fmt) - 1] != '\n';
179}
180
181/* debug message (if unzip_debug) */
182static void
183debug(const char *fmt, ...)
184{
185	va_list ap;
186
187	if (!unzip_debug)
188		return;
189	va_start(ap, fmt);
190	vfprintf(stderr, fmt, ap);
191	va_end(ap);
192	fflush(stderr);
193
194	if (*fmt == '\0')
195		noeol = 1;
196	else
197		noeol = fmt[strlen(fmt) - 1] != '\n';
198}
199
200/* duplicate a path name, possibly converting to lower case */
201static char *
202pathdup(const char *path)
203{
204	char *str;
205	size_t i, len;
206
207	len = strlen(path);
208	while (len && path[len - 1] == '/')
209		len--;
210	if ((str = malloc(len + 1)) == NULL) {
211		errno = ENOMEM;
212		error("malloc()");
213	}
214	if (L_opt) {
215		for (i = 0; i < len; ++i)
216			str[i] = tolower((unsigned char)path[i]);
217	} else {
218		memcpy(str, path, len);
219	}
220	str[len] = '\0';
221
222	return (str);
223}
224
225/* concatenate two path names */
226static char *
227pathcat(const char *prefix, const char *path)
228{
229	char *str;
230	size_t prelen, len;
231
232	prelen = prefix ? strlen(prefix) + 1 : 0;
233	len = strlen(path) + 1;
234	if ((str = malloc(prelen + len)) == NULL) {
235		errno = ENOMEM;
236		error("malloc()");
237	}
238	if (prefix) {
239		memcpy(str, prefix, prelen);	/* includes zero */
240		str[prelen - 1] = '/';		/* splat zero */
241	}
242	memcpy(str + prelen, path, len);	/* includes zero */
243
244	return (str);
245}
246
247/*
248 * Pattern lists for include / exclude processing
249 */
250struct pattern {
251	STAILQ_ENTRY(pattern) link;
252	char pattern[];
253};
254
255STAILQ_HEAD(pattern_list, pattern);
256static struct pattern_list include = STAILQ_HEAD_INITIALIZER(include);
257static struct pattern_list exclude = STAILQ_HEAD_INITIALIZER(exclude);
258
259/*
260 * Add an entry to a pattern list
261 */
262static void
263add_pattern(struct pattern_list *list, const char *pattern)
264{
265	struct pattern *entry;
266	size_t len;
267
268	debug("adding pattern '%s'\n", pattern);
269	len = strlen(pattern);
270	if ((entry = malloc(sizeof *entry + len + 1)) == NULL) {
271		errno = ENOMEM;
272		error("malloc()");
273	}
274	memcpy(entry->pattern, pattern, len + 1);
275	STAILQ_INSERT_TAIL(list, entry, link);
276}
277
278/*
279 * Match a string against a list of patterns
280 */
281static int
282match_pattern(struct pattern_list *list, const char *str)
283{
284	struct pattern *entry;
285
286	STAILQ_FOREACH(entry, list, link) {
287		if (fnmatch(entry->pattern, str, C_opt ? FNM_CASEFOLD : 0) == 0)
288			return (1);
289	}
290	return (0);
291}
292
293/*
294 * Verify that a given pathname is in the include list and not in the
295 * exclude list.
296 */
297static int
298accept_pathname(const char *pathname)
299{
300
301	if (!STAILQ_EMPTY(&include) && !match_pattern(&include, pathname))
302		return (0);
303	if (!STAILQ_EMPTY(&exclude) && match_pattern(&exclude, pathname))
304		return (0);
305	return (1);
306}
307
308/*
309 * Create the specified directory with the specified mode, taking certain
310 * precautions on they way.
311 */
312static void
313make_dir(const char *path, int mode)
314{
315	struct stat sb;
316
317	if (lstat(path, &sb) == 0) {
318		if (S_ISDIR(sb.st_mode))
319			return;
320		/*
321		 * Normally, we should either ask the user about removing
322		 * the non-directory of the same name as a directory we
323		 * wish to create, or respect the -n or -o command-line
324		 * options.  However, this may lead to a later failure or
325		 * even compromise (if this non-directory happens to be a
326		 * symlink to somewhere unsafe), so we don't.
327		 */
328
329		/*
330		 * Don't check unlink() result; failure will cause mkdir()
331		 * to fail later, which we will catch.
332		 */
333		(void)unlink(path);
334	}
335	if (mkdir(path, mode) != 0 && errno != EEXIST)
336		error("mkdir('%s')", path);
337}
338
339/*
340 * Ensure that all directories leading up to (but not including) the
341 * specified path exist.
342 *
343 * XXX inefficient + modifies the file in-place
344 */
345static void
346make_parent(char *path)
347{
348	struct stat sb;
349	char *sep;
350
351	sep = strrchr(path, '/');
352	if (sep == NULL || sep == path)
353		return;
354	*sep = '\0';
355	if (lstat(path, &sb) == 0) {
356		if (S_ISDIR(sb.st_mode)) {
357			*sep = '/';
358			return;
359		}
360		unlink(path);
361	}
362	make_parent(path);
363	mkdir(path, 0755);
364	*sep = '/';
365
366#if 0
367	for (sep = path; (sep = strchr(sep, '/')) != NULL; sep++) {
368		/* root in case of absolute d_arg */
369		if (sep == path)
370			continue;
371		*sep = '\0';
372		make_dir(path, 0755);
373		*sep = '/';
374	}
375#endif
376}
377
378/*
379 * Extract a directory.
380 */
381static void
382extract_dir(struct archive *a, struct archive_entry *e, const char *path)
383{
384	int mode;
385
386	mode = archive_entry_mode(e) & 0777;
387	if (mode == 0)
388		mode = 0755;
389
390	/*
391	 * Some zipfiles contain directories with weird permissions such
392	 * as 0644 or 0444.  This can cause strange issues such as being
393	 * unable to extract files into the directory we just created, or
394	 * the user being unable to remove the directory later without
395	 * first manually changing its permissions.  Therefore, we whack
396	 * the permissions into shape, assuming that the user wants full
397	 * access and that anyone who gets read access also gets execute
398	 * access.
399	 */
400	mode |= 0700;
401	if (mode & 0040)
402		mode |= 0010;
403	if (mode & 0004)
404		mode |= 0001;
405
406	info("d %s\n", path);
407	make_dir(path, mode);
408	ac(archive_read_data_skip(a));
409}
410
411static unsigned char buffer[8192];
412static char spinner[] = { '|', '/', '-', '\\' };
413
414static int
415handle_existing_file(char **path)
416{
417	size_t alen;
418	ssize_t len;
419	char buf[4];
420
421	for (;;) {
422		fprintf(stderr,
423		    "replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ",
424		    *path);
425		if (fgets(buf, sizeof(buf), stdin) == NULL) {
426			clearerr(stdin);
427			printf("NULL\n(EOF or read error, "
428			    "treating as \"[N]one\"...)\n");
429			n_opt = 1;
430			return -1;
431		}
432		switch (*buf) {
433		case 'A':
434			o_opt = 1;
435			/* FALLTHROUGH */
436		case 'y':
437		case 'Y':
438			(void)unlink(*path);
439			return 1;
440		case 'N':
441			n_opt = 1;
442			/* FALLTHROUGH */
443		case 'n':
444			return -1;
445		case 'r':
446		case 'R':
447			printf("New name: ");
448			fflush(stdout);
449			free(*path);
450			*path = NULL;
451			alen = 0;
452			len = getdelim(path, &alen, '\n', stdin);
453			if ((*path)[len - 1] == '\n')
454				(*path)[len - 1] = '\0';
455			return 0;
456		default:
457			break;
458		}
459	}
460}
461
462/*
463 * Detect binary files by a combination of character white list and
464 * black list. NUL bytes and other control codes without use in text files
465 * result directly in switching the file to binary mode. Otherwise, at least
466 * one white-listed byte has to be found.
467 *
468 * Black-listed: 0..6, 14..25, 28..31
469 * White-listed: 9..10, 13, >= 32
470 *
471 * See the proginfo/txtvsbin.txt in the zip sources for a detailed discussion.
472 */
473#define BYTE_IS_BINARY(x)	((x) < 32 && (0xf3ffc07fU & (1U << (x))))
474#define	BYTE_IS_TEXT(x)		((x) >= 32 || (0x00002600U & (1U << (x))))
475
476static int
477check_binary(const unsigned char *buf, size_t len)
478{
479	int rv;
480	for (rv = 1; len--; ++buf) {
481		if (BYTE_IS_BINARY(*buf))
482			return 1;
483		if (BYTE_IS_TEXT(*buf))
484			rv = 0;
485	}
486
487	return rv;
488}
489
490/*
491 * Extract to a file descriptor
492 */
493static int
494extract2fd(struct archive *a, char *pathname, int fd)
495{
496	int cr, text, warn;
497	ssize_t len;
498	unsigned char *p, *q, *end;
499
500	text = a_opt;
501	warn = 0;
502	cr = 0;
503
504	/* loop over file contents and write to fd */
505	for (int n = 0; ; n++) {
506		if (fd != STDOUT_FILENO)
507			if (tty && (n % 4) == 0)
508				info(" %c\b\b", spinner[(n / 4) % sizeof spinner]);
509
510		len = archive_read_data(a, buffer, sizeof buffer);
511
512		if (len < 0)
513			ac(len);
514
515		/* left over CR from previous buffer */
516		if (a_opt && cr) {
517			if (len == 0 || buffer[0] != '\n')
518				if (write(fd, "\r", 1) != 1)
519					error("write('%s')", pathname);
520			cr = 0;
521		}
522
523		/* EOF */
524		if (len == 0)
525			break;
526		end = buffer + len;
527
528		/*
529		 * Detect whether this is a text file.  The correct way to
530		 * do this is to check the least significant bit of the
531		 * "internal file attributes" field of the corresponding
532		 * file header in the central directory, but libarchive
533		 * does not provide access to this field, so we have to
534		 * guess by looking for non-ASCII characters in the
535		 * buffer.  Hopefully we won't guess wrong.  If we do
536		 * guess wrong, we print a warning message later.
537		 */
538		if (a_opt && n == 0) {
539			if (check_binary(buffer, len))
540				text = 0;
541		}
542
543		/* simple case */
544		if (!a_opt || !text) {
545			if (write(fd, buffer, len) != len)
546				error("write('%s')", pathname);
547			continue;
548		}
549
550		/* hard case: convert \r\n to \n (sigh...) */
551		for (p = buffer; p < end; p = q + 1) {
552			for (q = p; q < end; q++) {
553				if (!warn && BYTE_IS_BINARY(*q)) {
554					warningx("%s may be corrupted due"
555					    " to weak text file detection"
556					    " heuristic", pathname);
557					warn = 1;
558				}
559				if (q[0] != '\r')
560					continue;
561				if (&q[1] == end) {
562					cr = 1;
563					break;
564				}
565				if (q[1] == '\n')
566					break;
567			}
568			if (write(fd, p, q - p) != q - p)
569				error("write('%s')", pathname);
570		}
571	}
572
573	return text;
574}
575
576/*
577 * Extract a regular file.
578 */
579static void
580extract_file(struct archive *a, struct archive_entry *e, char **path)
581{
582	int mode;
583	struct timespec mtime;
584	struct stat sb;
585	struct timespec ts[2];
586	int fd, check, text;
587	const char *linkname;
588
589	mode = archive_entry_mode(e) & 0777;
590	if (mode == 0)
591		mode = 0644;
592	mtime.tv_sec = archive_entry_mtime(e);
593	mtime.tv_nsec = archive_entry_mtime_nsec(e);
594
595	/* look for existing file of same name */
596recheck:
597	if (lstat(*path, &sb) == 0) {
598		if (u_opt || f_opt) {
599			/* check if up-to-date */
600			if ((S_ISREG(sb.st_mode) || S_ISLNK(sb.st_mode)) &&
601			    (sb.st_mtim.tv_sec > mtime.tv_sec ||
602			    (sb.st_mtim.tv_sec == mtime.tv_sec &&
603			    sb.st_mtim.tv_nsec >= mtime.tv_nsec)))
604				return;
605			(void)unlink(*path);
606		} else if (o_opt) {
607			/* overwrite */
608			(void)unlink(*path);
609		} else if (n_opt) {
610			/* do not overwrite */
611			return;
612		} else {
613			check = handle_existing_file(path);
614			if (check == 0)
615				goto recheck;
616			if (check == -1)
617				return; /* do not overwrite */
618		}
619	} else {
620		if (f_opt)
621			return;
622	}
623
624	ts[0].tv_sec = 0;
625	ts[0].tv_nsec = UTIME_NOW;
626	ts[1] = mtime;
627
628	/* process symlinks */
629	linkname = archive_entry_symlink(e);
630	if (linkname != NULL) {
631		if (symlink(linkname, *path) != 0)
632			error("symlink('%s')", *path);
633		info(" extracting: %s -> %s\n", *path, linkname);
634		if (lchmod(*path, mode) != 0)
635			warning("Cannot set mode for '%s'", *path);
636		/* set access and modification time */
637		if (utimensat(AT_FDCWD, *path, ts, AT_SYMLINK_NOFOLLOW) != 0)
638			warning("utimensat('%s')", *path);
639		return;
640	}
641
642	if ((fd = open(*path, O_RDWR|O_CREAT|O_TRUNC, mode)) < 0)
643		error("open('%s')", *path);
644
645	info(" extracting: %s", *path);
646
647	text = extract2fd(a, *path, fd);
648
649	if (tty)
650		info("  \b\b");
651	if (text)
652		info(" (text)");
653	info("\n");
654
655	/* set access and modification time */
656	if (futimens(fd, ts) != 0)
657		error("futimens('%s')", *path);
658	if (close(fd) != 0)
659		error("close('%s')", *path);
660}
661
662/*
663 * Extract a zipfile entry: first perform some sanity checks to ensure
664 * that it is either a directory or a regular file and that the path is
665 * not absolute and does not try to break out of the current directory;
666 * then call either extract_dir() or extract_file() as appropriate.
667 *
668 * This is complicated a bit by the various ways in which we need to
669 * manipulate the path name.  Case conversion (if requested by the -L
670 * option) happens first, but the include / exclude patterns are applied
671 * to the full converted path name, before the directory part of the path
672 * is removed in accordance with the -j option.  Sanity checks are
673 * intentionally done earlier than they need to be, so the user will get a
674 * warning about insecure paths even for files or directories which
675 * wouldn't be extracted anyway.
676 */
677static void
678extract(struct archive *a, struct archive_entry *e)
679{
680	char *pathname, *realpathname;
681	mode_t filetype;
682	char *p, *q;
683
684	pathname = pathdup(archive_entry_pathname(e));
685	filetype = archive_entry_filetype(e);
686
687	/* sanity checks */
688	if (pathname[0] == '/' ||
689	    strncmp(pathname, "../", 3) == 0 ||
690	    strstr(pathname, "/../") != NULL) {
691		warningx("skipping insecure entry '%s'", pathname);
692		ac(archive_read_data_skip(a));
693		free(pathname);
694		return;
695	}
696
697	/* I don't think this can happen in a zipfile.. */
698	if (!S_ISDIR(filetype) && !S_ISREG(filetype) && !S_ISLNK(filetype)) {
699		warningx("skipping non-regular entry '%s'", pathname);
700		ac(archive_read_data_skip(a));
701		free(pathname);
702		return;
703	}
704
705	/* skip directories in -j case */
706	if (S_ISDIR(filetype) && j_opt) {
707		ac(archive_read_data_skip(a));
708		free(pathname);
709		return;
710	}
711
712	/* apply include / exclude patterns */
713	if (!accept_pathname(pathname)) {
714		ac(archive_read_data_skip(a));
715		free(pathname);
716		return;
717	}
718
719	/* apply -j and -d */
720	if (j_opt) {
721		for (p = q = pathname; *p; ++p)
722			if (*p == '/')
723				q = p + 1;
724		realpathname = pathcat(d_arg, q);
725	} else {
726		realpathname = pathcat(d_arg, pathname);
727	}
728
729	/* ensure that parent directory exists */
730	make_parent(realpathname);
731
732	if (S_ISDIR(filetype))
733		extract_dir(a, e, realpathname);
734	else
735		extract_file(a, e, &realpathname);
736
737	free(realpathname);
738	free(pathname);
739}
740
741static void
742extract_stdout(struct archive *a, struct archive_entry *e)
743{
744	char *pathname;
745	mode_t filetype;
746
747	pathname = pathdup(archive_entry_pathname(e));
748	filetype = archive_entry_filetype(e);
749
750	/* I don't think this can happen in a zipfile.. */
751	if (!S_ISDIR(filetype) && !S_ISREG(filetype) && !S_ISLNK(filetype)) {
752		warningx("skipping non-regular entry '%s'", pathname);
753		ac(archive_read_data_skip(a));
754		free(pathname);
755		return;
756	}
757
758	/* skip directories in -j case */
759	if (S_ISDIR(filetype)) {
760		ac(archive_read_data_skip(a));
761		free(pathname);
762		return;
763	}
764
765	/* apply include / exclude patterns */
766	if (!accept_pathname(pathname)) {
767		ac(archive_read_data_skip(a));
768		free(pathname);
769		return;
770	}
771
772	if (c_opt)
773		info("x %s\n", pathname);
774
775	(void)extract2fd(a, pathname, STDOUT_FILENO);
776
777	free(pathname);
778}
779
780/*
781 * Print the name of an entry to stdout.
782 */
783static void
784list(struct archive *a, struct archive_entry *e)
785{
786	char buf[20];
787	time_t mtime;
788	struct tm *tm;
789
790	mtime = archive_entry_mtime(e);
791	tm = localtime(&mtime);
792	if (*y_str)
793		strftime(buf, sizeof(buf), "%m-%d-%G %R", tm);
794	else
795		strftime(buf, sizeof(buf), "%m-%d-%g %R", tm);
796
797	if (!zipinfo_mode) {
798		if (v_opt == 1) {
799			printf(" %8ju  %s   %s\n",
800			    (uintmax_t)archive_entry_size(e),
801			    buf, archive_entry_pathname(e));
802		} else if (v_opt == 2) {
803			printf("%8ju  Stored  %7ju   0%%  %s  %08x  %s\n",
804			    (uintmax_t)archive_entry_size(e),
805			    (uintmax_t)archive_entry_size(e),
806			    buf,
807			    0U,
808			    archive_entry_pathname(e));
809		}
810	} else {
811		if (Z1_opt)
812			printf("%s\n",archive_entry_pathname(e));
813	}
814	ac(archive_read_data_skip(a));
815}
816
817/*
818 * Extract to memory to check CRC
819 */
820static int
821test(struct archive *a, struct archive_entry *e)
822{
823	ssize_t len;
824	int error_count;
825
826	error_count = 0;
827	if (S_ISDIR(archive_entry_filetype(e)))
828		return 0;
829
830	info("    testing: %s\t", archive_entry_pathname(e));
831	while ((len = archive_read_data(a, buffer, sizeof buffer)) > 0)
832		/* nothing */;
833	if (len < 0) {
834		info(" %s\n", archive_error_string(a));
835		++error_count;
836	} else {
837		info(" OK\n");
838	}
839
840	/* shouldn't be necessary, but it doesn't hurt */
841	ac(archive_read_data_skip(a));
842
843	return error_count;
844}
845
846/*
847 * Main loop: open the zipfile, iterate over its contents and decide what
848 * to do with each entry.
849 */
850static void
851unzip(const char *fn)
852{
853	struct archive *a;
854	struct archive_entry *e;
855	int ret;
856	uintmax_t total_size, file_count, error_count;
857
858	if ((a = archive_read_new()) == NULL)
859		error("archive_read_new failed");
860
861	ac(archive_read_support_format_zip(a));
862	ac(archive_read_open_filename(a, fn, 8192));
863
864	if (!zipinfo_mode) {
865		if (!p_opt && !q_opt)
866			printf("Archive:  %s\n", fn);
867		if (v_opt == 1) {
868			printf("  Length     %sDate   Time    Name\n", y_str);
869			printf(" --------    %s----   ----    ----\n", y_str);
870		} else if (v_opt == 2) {
871			printf(" Length   Method    Size  Ratio   %sDate   Time   CRC-32    Name\n", y_str);
872			printf("--------  ------  ------- -----   %s----   ----   ------    ----\n", y_str);
873		}
874	}
875
876	total_size = 0;
877	file_count = 0;
878	error_count = 0;
879	for (;;) {
880		ret = archive_read_next_header(a, &e);
881		if (ret == ARCHIVE_EOF)
882			break;
883		ac(ret);
884		if (!zipinfo_mode) {
885			if (t_opt)
886				error_count += test(a, e);
887			else if (v_opt)
888				list(a, e);
889			else if (p_opt || c_opt)
890				extract_stdout(a, e);
891			else
892				extract(a, e);
893		} else {
894			if (Z1_opt)
895				list(a, e);
896		}
897
898		total_size += archive_entry_size(e);
899		++file_count;
900	}
901
902	if (zipinfo_mode) {
903		if (v_opt == 1) {
904			printf(" --------                   %s-------\n", y_str);
905			printf(" %8ju                   %s%ju file%s\n",
906			    total_size, y_str, file_count, file_count != 1 ? "s" : "");
907		} else if (v_opt == 2) {
908			printf("--------          -------  ---                            %s-------\n", y_str);
909			printf("%8ju          %7ju   0%%                            %s%ju file%s\n",
910			    total_size, total_size, y_str, file_count,
911			    file_count != 1 ? "s" : "");
912		}
913	}
914
915	ac(archive_read_close(a));
916	(void)archive_read_free(a);
917
918	if (t_opt) {
919		if (error_count > 0) {
920			errorx("%ju checksum error(s) found.", error_count);
921		}
922		else {
923			printf("No errors detected in compressed data of %s.\n",
924			       fn);
925		}
926	}
927}
928
929static void
930usage(void)
931{
932
933	fprintf(stderr, "Usage: unzip [-aCcfjLlnopqtuvyZ1] [-d dir] [-x pattern] zipfile\n");
934	exit(1);
935}
936
937static int
938getopts(int argc, char *argv[])
939{
940	int opt;
941
942	optreset = optind = 1;
943	while ((opt = getopt(argc, argv, "aCcd:fjLlnopqtuvx:yZ1")) != -1)
944		switch (opt) {
945		case '1':
946			Z1_opt = 1;
947			break;
948		case 'a':
949			a_opt = 1;
950			break;
951		case 'C':
952			C_opt = 1;
953			break;
954		case 'c':
955			c_opt = 1;
956			break;
957		case 'd':
958			d_arg = optarg;
959			break;
960		case 'f':
961			f_opt = 1;
962			break;
963		case 'j':
964			j_opt = 1;
965			break;
966		case 'L':
967			L_opt = 1;
968			break;
969		case 'l':
970			if (v_opt == 0)
971				v_opt = 1;
972			break;
973		case 'n':
974			n_opt = 1;
975			break;
976		case 'o':
977			o_opt = 1;
978			q_opt = 1;
979			break;
980		case 'p':
981			p_opt = 1;
982			break;
983		case 'q':
984			q_opt = 1;
985			break;
986		case 't':
987			t_opt = 1;
988			break;
989		case 'u':
990			u_opt = 1;
991			break;
992		case 'v':
993			v_opt = 2;
994			break;
995		case 'x':
996			add_pattern(&exclude, optarg);
997			break;
998		case 'y':
999			y_str = "  ";
1000			break;
1001		case 'Z':
1002			zipinfo_mode = 1;
1003			break;
1004		default:
1005			usage();
1006		}
1007
1008	return (optind);
1009}
1010
1011int
1012main(int argc, char *argv[])
1013{
1014	const char *zipfile;
1015	int nopts;
1016
1017	if (isatty(STDOUT_FILENO))
1018		tty = 1;
1019
1020	if (getenv("UNZIP_DEBUG") != NULL)
1021		unzip_debug = 1;
1022	for (int i = 0; i < argc; ++i)
1023		debug("%s%c", argv[i], (i < argc - 1) ? ' ' : '\n');
1024
1025	/*
1026	 * Info-ZIP's unzip(1) expects certain options to come before the
1027	 * zipfile name, and others to come after - though it does not
1028	 * enforce this.  For simplicity, we accept *all* options both
1029	 * before and after the zipfile name.
1030	 */
1031	nopts = getopts(argc, argv);
1032
1033	/*
1034	 * When more of the zipinfo mode options are implemented, this
1035	 * will need to change.
1036	 */
1037	if (zipinfo_mode && !Z1_opt) {
1038		printf("Zipinfo mode needs additional options\n");
1039		exit(1);
1040	}
1041
1042	if (argc <= nopts)
1043		usage();
1044	zipfile = argv[nopts++];
1045
1046	if (strcmp(zipfile, "-") == 0)
1047		zipfile = NULL; /* STDIN */
1048
1049	while (nopts < argc && *argv[nopts] != '-')
1050		add_pattern(&include, argv[nopts++]);
1051
1052	nopts--; /* fake argv[0] */
1053	nopts += getopts(argc - nopts, argv + nopts);
1054
1055	if (n_opt + o_opt + u_opt > 1)
1056		errorx("-n, -o and -u are contradictory");
1057
1058	unzip(zipfile);
1059
1060	exit(0);
1061}
1062