Module Name: src
Committed By: joerg
Date: Thu Jun 25 20:27:06 UTC 2009
Added Files:
src/usr.bin/unzip: Makefile unzip.1 unzip.c
Log Message:
Add work-in-progress unzip(1) frontend for libarchive.
Derived from FreeBSD's unzip.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/usr.bin/unzip/Makefile src/usr.bin/unzip/unzip.1 \
src/usr.bin/unzip/unzip.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/usr.bin/unzip/Makefile
diff -u /dev/null src/usr.bin/unzip/Makefile:1.1
--- /dev/null Thu Jun 25 20:27:06 2009
+++ src/usr.bin/unzip/Makefile Thu Jun 25 20:27:05 2009
@@ -0,0 +1,8 @@
+# $NetBSD: Makefile,v 1.1 2009/06/25 20:27:05 joerg Exp $
+
+PROG= unzip
+
+DPADD+= ${LIBARCHIVE} ${LIBZ} ${LIBBZ2}
+LDADD+= -larchive -lz -lbz2
+
+.include <bsd.prog.mk>
Index: src/usr.bin/unzip/unzip.1
diff -u /dev/null src/usr.bin/unzip/unzip.1:1.1
--- /dev/null Thu Jun 25 20:27:06 2009
+++ src/usr.bin/unzip/unzip.1 Thu Jun 25 20:27:05 2009
@@ -0,0 +1,168 @@
+.\"-
+.\" Copyright (c) 2007-2008 Dag-Erling Coïdan Smørgrav
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD: revision 180125$
+.\" $NetBSD: unzip.1,v 1.1 2009/06/25 20:27:05 joerg Exp $
+.\"
+.Dd June 30, 2008
+.Dt UNZIP 1
+.Os
+.Sh NAME
+.Nm unzip
+.Nd extract files from a ZIP archive
+.Sh SYNOPSIS
+.Nm
+.Op Fl afjLlnoqtu
+.Op Fl d Ar dir
+.Op Fl x Ar pattern
+.Ar zipfile
+.Sh DESCRIPTION
+.\" ...
+.Pp
+The following options are available:
+.Bl -tag -width Fl
+.It Fl a
+When extracting a text file, convert DOS-style line endings to
+Unix-style line endings.
+.It Fl d Ar dir
+Extract files into the specified directory rather than the current
+directory.
+.It Fl f
+Update existing.
+Extract only files from the zipfile, if a file with the same name
+already exists on disk and is older than the former.
+Otherwise, the file is silently skipped.
+.It Fl j
+Ignore directories stored in the zipfile; instead, extract all files
+directly into the extraction directory.
+.It Fl L
+Convert the names of the extracted files and directories to lowercase.
+.It Fl l
+List, rather than extract, the contents of the zipfile.
+.It Fl n
+No overwrite.
+When extacting a file from the zipfile, if a file with the same name
+already exists on disk, the file is silently skipped.
+.It Fl o
+Overwrite.
+When extacting a file from the zipfile, if a file with the same name
+already exists on disk, the existing file is replaced with the file
+from the zipfile.
+.It Fl q
+Quiet: print less information while extracting.
+.It Fl t
+Test: do not extract anything, but verify the checksum of every file
+in the archive.
+.It Fl u
+Update.
+When extracting a file from the zipfile, if a file with the same name
+already exists on disk, the existing file is replaced with the file
+from the zipfile if and only if the latter is newer than the former.
+Otherwise, the file is silently skipped.
+.It Fl x Ar pattern
+Exclude files matching the pattern
+.Ar pattern .
+.El
+.Pp
+Note that only one of
+.Fl n ,
+.Fl o
+and
+.Fl u
+may be specified.
+.Sh ENVIRONMENT
+If the
+.Ev UNZIP_DEBUG
+environment variable is defined, the
+.Fl q
+command-line option has no effect, and additional debugging
+information will be printed to
+.Va stderr .
+.Sh COMPATIBILITY
+The
+.Nm
+utility aims to be sufficiently compatible with other implementations
+to serve as a drop-in replacement in the context of the
+.Xr pkgsrc 7
+system.
+No attempt has been made to replicate functionality which is not
+required for that purpose.
+.Pp
+For compatibility reasons, command-line options will be recognized if
+they are listed not only before but also after the name of the
+zipfile.
+.Pp
+Normally, the
+.Fl a
+option should only affect files which are marked as text files in the
+zipfile's central directory.
+Since the
+.Xr archive 3
+library reads zipfiles sequentially, and does not use the central
+directory, that information is not available to the
+.Nm
+utility.
+Instead, the
+.Nm
+utility will assume that a file is a text file if no non-ASCII
+characters are present within the first block of data decompressed for
+that file.
+If non-ASCII characters appear in subsequent blocks of data, a warning
+will be issued.
+.Pp
+The
+.Nm
+utility is only able to process ZIP archives handled by
+.Xr libarchive 3 .
+Depending on the installed version of
+.Xr libarchive ,
+this may or may not include self-extracting archives.
+.Sh BUGS
+The
+.Nm
+utility currently does not support asking the user whether to
+overwrite or skip a file that already exists on disk.
+To be on the safe side, it will fail if it encounters a file that
+already exists and neither the
+.Fl n
+nor the
+.Fl o
+command line option was specified.
+.Sh SEE ALSO
+.Xr libarchive 3
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Nx 6.0 .
+.Sh AUTHORS
+The
+.Nm
+utility and this manual page were written by
+.An Dag-Erling Sm\(/orgrav Aq [email protected] .
+It uses the
+.Xr archive 3
+library developed by
+.An Tim Kientzle Aq [email protected] .
Index: src/usr.bin/unzip/unzip.c
diff -u /dev/null src/usr.bin/unzip/unzip.c:1.1
--- /dev/null Thu Jun 25 20:27:06 2009
+++ src/usr.bin/unzip/unzip.c Thu Jun 25 20:27:05 2009
@@ -0,0 +1,810 @@
+/* $NetBSD: unzip.c,v 1.1 2009/06/25 20:27:05 joerg Exp $ */
+
+/*-
+ * Copyright (c) 2009 Joerg Sonnenberger <[email protected]>
+ * Copyright (c) 2007-2008 Dag-Erling Coïdan Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer
+ * in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: revision 180124$
+ *
+ * This file would be much shorter if we didn't care about command-line
+ * compatibility with Info-ZIP's UnZip, which requires us to duplicate
+ * parts of libarchive in order to gain more detailed control of its
+ * behaviour for the purpose of implementing the -n, -o, -L and -a
+ * options.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: unzip.c,v 1.1 2009/06/25 20:27:05 joerg Exp $");
+
+#include <sys/queue.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <archive.h>
+#include <archive_entry.h>
+
+/* command-line options */
+static int a_opt; /* convert EOL */
+static const char *d_arg; /* directory */
+static int f_opt; /* update existing files only */
+static int j_opt; /* junk directories */
+static int L_opt; /* lowercase names */
+static int l_opt; /* list */
+static int n_opt; /* never overwrite */
+static int o_opt; /* always overwrite */
+static int q_opt; /* quiet */
+static int t_opt; /* test */
+static int u_opt; /* update */
+
+/* time when unzip started */
+static time_t now;
+
+/* debug flag */
+static int unzip_debug;
+
+/* running on tty? */
+static int tty;
+
+/* error flag for -t */
+static int test_failed;
+
+/* convenience macro */
+/* XXX should differentiate between ARCHIVE_{WARN,FAIL,RETRY} */
+#define ac(call) \
+ do { \
+ int acret = (call); \
+ if (acret != ARCHIVE_OK) \
+ errorx("%s", archive_error_string(a)); \
+ } while (0)
+
+/*
+ * Indicates that last info() did not end with EOL. This helps error() et
+ * al. avoid printing an error message on the same line as an incomplete
+ * informational message.
+ */
+static int noeol;
+
+/* fatal error message + errno */
+static void
+error(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (noeol)
+ fprintf(stdout, "\n");
+ fflush(stdout);
+ fprintf(stderr, "unzip: ");
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, ": %s\n", strerror(errno));
+ exit(1);
+}
+
+/* fatal error message, no errno */
+static void
+errorx(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (noeol)
+ fprintf(stdout, "\n");
+ fflush(stdout);
+ fprintf(stderr, "unzip: ");
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, "\n");
+ exit(1);
+}
+
+#if 0
+/* non-fatal error message + errno */
+static void
+warning(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (noeol)
+ fprintf(stdout, "\n");
+ fflush(stdout);
+ fprintf(stderr, "unzip: ");
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, ": %s\n", strerror(errno));
+}
+#endif
+
+/* non-fatal error message, no errno */
+static void
+warningx(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (noeol)
+ fprintf(stdout, "\n");
+ fflush(stdout);
+ fprintf(stderr, "unzip: ");
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, "\n");
+}
+
+/* informational message (if not -q) */
+static void
+info(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (q_opt && !unzip_debug)
+ return;
+ va_start(ap, fmt);
+ vfprintf(stdout, fmt, ap);
+ va_end(ap);
+ fflush(stdout);
+
+ if (*fmt == '\0')
+ noeol = 1;
+ else
+ noeol = fmt[strlen(fmt) - 1] != '\n';
+}
+
+/* debug message (if unzip_debug) */
+static void
+debug(const char *fmt, ...)
+{
+ va_list ap;
+
+ if (!unzip_debug)
+ return;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fflush(stderr);
+
+ if (*fmt == '\0')
+ noeol = 1;
+ else
+ noeol = fmt[strlen(fmt) - 1] != '\n';
+}
+
+/* duplicate a path name, possibly converting to lower case */
+static char *
+pathdup(const char *path)
+{
+ char *str;
+ size_t i, len;
+
+ len = strlen(path);
+ while (len && path[len - 1] == '/')
+ len--;
+ if ((str = malloc(len + 1)) == NULL) {
+ errno = ENOMEM;
+ error("malloc()");
+ }
+ if (L_opt) {
+ for (i = 0; i < len; ++i)
+ str[i] = tolower((unsigned char)path[i]);
+ } else {
+ memcpy(str, path, len);
+ }
+ str[len] = '\0';
+
+ return (str);
+}
+
+/* concatenate two path names */
+static char *
+pathcat(const char *prefix, const char *path)
+{
+ char *str;
+ size_t prelen, len;
+
+ prelen = prefix ? strlen(prefix) + 1 : 0;
+ len = strlen(path) + 1;
+ if ((str = malloc(prelen + len)) == NULL) {
+ errno = ENOMEM;
+ error("malloc()");
+ }
+ if (prefix) {
+ memcpy(str, prefix, prelen); /* includes zero */
+ str[prelen - 1] = '/'; /* splat zero */
+ }
+ memcpy(str + prelen, path, len); /* includes zero */
+
+ return (str);
+}
+
+/*
+ * Pattern lists for include / exclude processing
+ */
+struct pattern {
+ STAILQ_ENTRY(pattern) link;
+ char pattern[];
+};
+
+STAILQ_HEAD(pattern_list, pattern);
+static struct pattern_list include = STAILQ_HEAD_INITIALIZER(include);
+static struct pattern_list exclude = STAILQ_HEAD_INITIALIZER(exclude);
+
+/*
+ * Add an entry to a pattern list
+ */
+static void
+add_pattern(struct pattern_list *list, const char *pattern)
+{
+ struct pattern *entry;
+ size_t len;
+
+ debug("adding pattern '%s'\n", pattern);
+ len = strlen(pattern);
+ if ((entry = malloc(sizeof *entry + len + 1)) == NULL) {
+ errno = ENOMEM;
+ error("malloc()");
+ }
+ memcpy(entry->pattern, pattern, len + 1);
+ STAILQ_INSERT_TAIL(list, entry, link);
+}
+
+/*
+ * Match a string against a list of patterns
+ */
+static int
+match_pattern(struct pattern_list *list, const char *str)
+{
+ struct pattern *entry;
+
+ STAILQ_FOREACH(entry, list, link) {
+ if (fnmatch(entry->pattern, str, 0) == 0)
+ return (1);
+ }
+ return (0);
+}
+
+/*
+ * Verify that a given pathname is in the include list and not in the
+ * exclude list.
+ */
+static int
+accept_pathname(const char *pathname)
+{
+
+ if (!STAILQ_EMPTY(&include) && !match_pattern(&include, pathname))
+ return (0);
+ if (!STAILQ_EMPTY(&exclude) && match_pattern(&exclude, pathname))
+ return (0);
+ return (1);
+}
+
+/*
+ * Create the specified directory with the specified mode, taking certain
+ * precautions on they way.
+ */
+static void
+make_dir(const char *path, int mode)
+{
+ struct stat sb;
+
+ if (lstat(path, &sb) == 0) {
+ if (S_ISDIR(sb.st_mode))
+ return;
+ /*
+ * Normally, we should either ask the user about removing
+ * the non-directory of the same name as a directory we
+ * wish to create, or respect the -n or -o command-line
+ * options. However, this may lead to a later failure or
+ * even compromise (if this non-directory happens to be a
+ * symlink to somewhere unsafe), so we don't.
+ */
+
+ /*
+ * Don't check unlink() result; failure will cause mkdir()
+ * to fail later, which we will catch.
+ */
+ (void)unlink(path);
+ }
+ if (mkdir(path, mode) != 0 && errno != EEXIST)
+ error("mkdir('%s')", path);
+}
+
+/*
+ * Ensure that all directories leading up to (but not including) the
+ * specified path exist.
+ *
+ * XXX inefficient + modifies the file in-place
+ */
+static void
+make_parent(char *path)
+{
+ struct stat sb;
+ char *sep;
+
+ sep = strrchr(path, '/');
+ if (sep == NULL || sep == path)
+ return;
+ *sep = '\0';
+ if (lstat(path, &sb) == 0) {
+ if (S_ISDIR(sb.st_mode)) {
+ *sep = '/';
+ return;
+ }
+ unlink(path);
+ }
+ make_parent(path);
+ mkdir(path, 0755);
+ *sep = '/';
+
+#if 0
+ for (sep = path; (sep = strchr(sep, '/')) != NULL; sep++) {
+ /* root in case of absolute d_arg */
+ if (sep == path)
+ continue;
+ *sep = '\0';
+ make_dir(path, 0755);
+ *sep = '/';
+ }
+#endif
+}
+
+/*
+ * Extract a directory.
+ */
+static void
+extract_dir(struct archive *a, struct archive_entry *e, const char *path)
+{
+ int mode;
+
+ mode = archive_entry_filetype(e) & 0777;
+ if (mode == 0)
+ mode = 0755;
+
+ /*
+ * Some zipfiles contain directories with weird permissions such
+ * as 0644 or 0444. This can cause strange issues such as being
+ * unable to extract files into the directory we just created, or
+ * the user being unable to remove the directory later without
+ * first manually changing its permissions. Therefore, we whack
+ * the permissions into shape, assuming that the user wants full
+ * access and that anyone who gets read access also gets execute
+ * access.
+ */
+ mode |= 0700;
+ if (mode & 0040)
+ mode |= 0010;
+ if (mode & 0004)
+ mode |= 0001;
+
+ info("d %s\n", path);
+ make_dir(path, mode);
+ ac(archive_read_data_skip(a));
+}
+
+static unsigned char buffer[8192];
+static char spinner[] = { '|', '/', '-', '\\' };
+
+/*
+ * Extract a regular file.
+ */
+static void
+extract_file(struct archive *a, struct archive_entry *e, const char *path)
+{
+ int mode;
+ time_t mtime;
+ struct stat sb;
+ struct timeval tv[2];
+ int cr, fd, text, warn;
+ ssize_t len;
+ unsigned char *p, *q, *end;
+
+ mode = archive_entry_filetype(e) & 0777;
+ if (mode == 0)
+ mode = 0644;
+ mtime = archive_entry_mtime(e);
+
+ /* look for existing file of same name */
+ if (lstat(path, &sb) == 0) {
+ if (u_opt || f_opt) {
+ /* check if up-to-date */
+ if (S_ISREG(sb.st_mode) && sb.st_mtime >= mtime)
+ return;
+ (void)unlink(path);
+ } else if (o_opt) {
+ /* overwrite */
+ (void)unlink(path);
+ } else if (n_opt) {
+ /* do not overwrite */
+ return;
+ } else {
+ /* XXX ask user */
+ errorx("not implemented");
+ }
+ } else {
+ if (f_opt)
+ return;
+ }
+
+ if ((fd = open(path, O_RDWR|O_CREAT|O_TRUNC, mode)) < 0)
+ error("open('%s')", path);
+
+ /* loop over file contents and write to disk */
+ info("x %s", path);
+ text = a_opt;
+ warn = 0;
+ cr = 0;
+ for (int n = 0; ; n++) {
+ if (tty && (n % 4) == 0)
+ info(" %c\b\b", spinner[(n / 4) % sizeof spinner]);
+
+ len = archive_read_data(a, buffer, sizeof buffer);
+
+ if (len < 0)
+ ac(len);
+
+ /* left over CR from previous buffer */
+ if (a_opt && cr) {
+ if (len == 0 || buffer[0] != '\n')
+ if (write(fd, "\r", 1) != 1)
+ error("write('%s')", path);
+ cr = 0;
+ }
+
+ /* EOF */
+ if (len == 0)
+ break;
+ end = buffer + len;
+
+ /*
+ * Detect whether this is a text file. The correct way to
+ * do this is to check the least significant bit of the
+ * "internal file attributes" field of the corresponding
+ * file header in the central directory, but libarchive
+ * does not read the central directory, so we have to
+ * guess by looking for non-ASCII characters in the
+ * buffer. Hopefully we won't guess wrong. If we do
+ * guess wrong, we print a warning message later.
+ */
+ if (a_opt && n == 0) {
+ for (p = buffer; p < end; ++p) {
+ if (!isascii((unsigned char)*p)) {
+ text = 0;
+ break;
+ }
+ }
+ }
+
+ /* simple case */
+ if (!a_opt || !text) {
+ if (write(fd, buffer, len) != len)
+ error("write('%s')", path);
+ continue;
+ }
+
+ /* hard case: convert \r\n to \n (sigh...) */
+ for (p = buffer; p < end; p = q + 1) {
+ for (q = p; q < end; q++) {
+ if (!warn && !isascii(*q)) {
+ warningx("%s may be corrupted due"
+ " to weak text file detection"
+ " heuristic", path);
+ warn = 1;
+ }
+ if (q[0] != '\r')
+ continue;
+ if (&q[1] == end) {
+ cr = 1;
+ break;
+ }
+ if (q[1] == '\n')
+ break;
+ }
+ if (write(fd, p, q - p) != q - p)
+ error("write('%s')", path);
+ }
+ }
+ if (tty)
+ info(" \b\b");
+ if (text)
+ info(" (text)");
+ info("\n");
+
+ /* set access and modification time */
+ tv[0].tv_sec = now;
+ tv[0].tv_usec = 0;
+ tv[1].tv_sec = mtime;
+ tv[1].tv_usec = 0;
+ if (futimes(fd, tv) != 0)
+ error("utimes('%s')", path);
+ if (close(fd) != 0)
+ error("close('%s')", path);
+}
+
+/*
+ * Extract a zipfile entry: first perform some sanity checks to ensure
+ * that it is either a directory or a regular file and that the path is
+ * not absolute and does not try to break out of the current directory;
+ * then call either extract_dir() or extract_file() as appropriate.
+ *
+ * This is complicated a bit by the various ways in which we need to
+ * manipulate the path name. Case conversion (if requested by the -L
+ * option) happens first, but the include / exclude patterns are applied
+ * to the full converted path name, before the directory part of the path
+ * is removed in accordance with the -j option. Sanity checks are
+ * intentionally done earlier than they need to be, so the user will get a
+ * warning about insecure paths even for files or directories which
+ * wouldn't be extracted anyway.
+ */
+static void
+extract(struct archive *a, struct archive_entry *e)
+{
+ char *pathname, *realpathname;
+ mode_t filetype;
+ char *p, *q;
+
+ pathname = pathdup(archive_entry_pathname(e));
+ filetype = archive_entry_filetype(e);
+
+ /* sanity checks */
+ if (pathname[0] == '/' ||
+ strncmp(pathname, "../", 3) == 0 ||
+ strstr(pathname, "/../") != NULL) {
+ warningx("skipping insecure entry '%s'", pathname);
+ ac(archive_read_data_skip(a));
+ free(pathname);
+ return;
+ }
+
+ /* I don't think this can happen in a zipfile.. */
+ if (!S_ISDIR(filetype) && !S_ISREG(filetype)) {
+ warningx("skipping non-regular entry '%s'", pathname);
+ ac(archive_read_data_skip(a));
+ free(pathname);
+ return;
+ }
+
+ /* skip directories in -j case */
+ if (S_ISDIR(filetype) && j_opt) {
+ ac(archive_read_data_skip(a));
+ free(pathname);
+ return;
+ }
+
+ /* apply include / exclude patterns */
+ if (!accept_pathname(pathname)) {
+ ac(archive_read_data_skip(a));
+ free(pathname);
+ return;
+ }
+
+ /* apply -j and -d */
+ if (j_opt) {
+ for (p = q = pathname; *p; ++p)
+ if (*p == '/')
+ q = p + 1;
+ realpathname = pathcat(d_arg, q);
+ } else {
+ realpathname = pathcat(d_arg, pathname);
+ }
+
+ /* ensure that parent directory exists */
+ make_parent(realpathname);
+
+ if (S_ISDIR(filetype))
+ extract_dir(a, e, realpathname);
+ else
+ extract_file(a, e, realpathname);
+
+ free(realpathname);
+ free(pathname);
+}
+
+/*
+ * Print the name of an entry to stdout.
+ */
+static void
+list(struct archive *a, struct archive_entry *e)
+{
+
+ printf("%s\n", archive_entry_pathname(e));
+ ac(archive_read_data_skip(a));
+}
+
+/*
+ * Extract to memory to check CRC
+ */
+static void
+test(struct archive *a, struct archive_entry *e)
+{
+ ssize_t len;
+
+ if (S_ISDIR(archive_entry_filetype(e)))
+ return;
+
+ info("%s ", archive_entry_pathname(e));
+ while ((len = archive_read_data(a, buffer, sizeof buffer)) > 0)
+ /* nothing */;
+ if (len < 0) {
+ info("%s\n", archive_error_string(a));
+ ++test_failed;
+ } else {
+ info("OK\n");
+ }
+
+ /* shouldn't be necessary, but it doesn't hurt */
+ ac(archive_read_data_skip(a));
+}
+
+
+/*
+ * Main loop: open the zipfile, iterate over its contents and decide what
+ * to do with each entry.
+ */
+static void
+unzip(const char *fn)
+{
+ struct archive *a;
+ struct archive_entry *e;
+ int fd, ret;
+
+ if ((fd = open(fn, O_RDONLY)) < 0)
+ error("%s", fn);
+
+ a = archive_read_new();
+ ac(archive_read_support_format_zip(a));
+ ac(archive_read_open_fd(a, fd, 8192));
+
+ for (;;) {
+ ret = archive_read_next_header(a, &e);
+ if (ret == ARCHIVE_EOF)
+ break;
+ ac(ret);
+ if (t_opt)
+ test(a, e);
+ else if (l_opt)
+ list(a, e);
+ else
+ extract(a, e);
+ }
+
+ ac(archive_read_close(a));
+ (void)archive_read_finish(a);
+ if (close(fd) != 0)
+ error("%s", fn);
+
+ if (t_opt && test_failed)
+ errorx("%d checksum error(s) found.", test_failed);
+}
+
+static void
+usage(void)
+{
+
+ fprintf(stderr, "usage: unzip [-ajLlnoqtu] [-d dir] zipfile\n");
+ exit(1);
+}
+
+static int
+getopts(int argc, char *argv[])
+{
+ int opt;
+
+ optreset = optind = 1;
+ while ((opt = getopt(argc, argv, "ad:fjLlnoqtux:")) != -1)
+ switch (opt) {
+ case 'a':
+ a_opt = 1;
+ break;
+ case 'd':
+ d_arg = optarg;
+ break;
+ case 'f':
+ f_opt = 1;
+ break;
+ case 'j':
+ j_opt = 1;
+ break;
+ case 'L':
+ L_opt = 1;
+ break;
+ case 'l':
+ l_opt = 1;
+ break;
+ case 'n':
+ n_opt = 1;
+ break;
+ case 'o':
+ o_opt = 1;
+ break;
+ case 'q':
+ q_opt = 1;
+ break;
+ case 't':
+ t_opt = 1;
+ break;
+ case 'u':
+ u_opt = 1;
+ break;
+ case 'x':
+ add_pattern(&exclude, optarg);
+ break;
+ default:
+ usage();
+ }
+
+ return (optind);
+}
+
+int
+main(int argc, char *argv[])
+{
+ const char *zipfile;
+ int nopts;
+
+ if (isatty(STDOUT_FILENO))
+ tty = 1;
+
+ if (getenv("UNZIP_DEBUG") != NULL)
+ unzip_debug = 1;
+ for (int i = 0; i < argc; ++i)
+ debug("%s%c", argv[i], (i < argc - 1) ? ' ' : '\n');
+
+ /*
+ * Info-ZIP's unzip(1) expects certain options to come before the
+ * zipfile name, and others to come after - though it does not
+ * enforce this. For simplicity, we accept *all* options both
+ * before and after the zipfile name.
+ */
+ nopts = getopts(argc, argv);
+
+ if (argc <= nopts)
+ usage();
+ zipfile = argv[nopts++];
+
+ while (nopts < argc && *argv[nopts] != '-')
+ add_pattern(&include, argv[nopts++]);
+
+ nopts--; /* fake argv[0] */
+ nopts += getopts(argc - nopts, argv + nopts);
+
+ if (n_opt + o_opt + u_opt > 1)
+ errorx("-n, -o and -u are contradictory");
+
+ time(&now);
+
+ unzip(zipfile);
+
+ exit(0);
+}
