376 lines
10 KiB
C
376 lines
10 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini unzip implementation for busybox
|
|
*
|
|
* Copyright (C) 2004 by Ed Clark
|
|
*
|
|
* Loosely based on original busybox unzip applet by Laurence Anderson.
|
|
* All options and features should work in this version.
|
|
*
|
|
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
|
*/
|
|
|
|
/* For reference see
|
|
* http://www.pkware.com/company/standards/appnote/
|
|
* http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
|
|
*/
|
|
|
|
/* TODO
|
|
* Endian issues
|
|
* Zip64 + other methods
|
|
* Improve handling of zip format, ie.
|
|
* - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
|
|
* - unix file permissions, etc.
|
|
* - central directory
|
|
*/
|
|
|
|
#include "busybox.h"
|
|
#include "unarchive.h"
|
|
|
|
#define ZIP_FILEHEADER_MAGIC SWAP_LE32(0x04034b50)
|
|
#define ZIP_CDS_MAGIC SWAP_LE32(0x02014b50)
|
|
#define ZIP_CDS_END_MAGIC SWAP_LE32(0x06054b50)
|
|
#define ZIP_DD_MAGIC SWAP_LE32(0x08074b50)
|
|
|
|
typedef union {
|
|
unsigned char raw[26];
|
|
struct {
|
|
unsigned short version; /* 0-1 */
|
|
unsigned short flags; /* 2-3 */
|
|
unsigned short method; /* 4-5 */
|
|
unsigned short modtime; /* 6-7 */
|
|
unsigned short moddate; /* 8-9 */
|
|
unsigned int crc32 ATTRIBUTE_PACKED; /* 10-13 */
|
|
unsigned int cmpsize ATTRIBUTE_PACKED; /* 14-17 */
|
|
unsigned int ucmpsize ATTRIBUTE_PACKED; /* 18-21 */
|
|
unsigned short filename_len; /* 22-23 */
|
|
unsigned short extra_len; /* 24-25 */
|
|
} formatted ATTRIBUTE_PACKED;
|
|
} zip_header_t;
|
|
|
|
static void unzip_skip(int fd, off_t skip)
|
|
{
|
|
if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
|
|
if (errno != ESPIPE)
|
|
bb_error_msg_and_die("seek failure");
|
|
bb_copyfd_exact_size(fd, -1, skip);
|
|
}
|
|
}
|
|
|
|
static void unzip_create_leading_dirs(char *fn)
|
|
{
|
|
/* Create all leading directories */
|
|
char *name = xstrdup(fn);
|
|
if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
|
|
bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
|
|
}
|
|
free(name);
|
|
}
|
|
|
|
static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
|
|
{
|
|
if (zip_header->formatted.method == 0) {
|
|
/* Method 0 - stored (not compressed) */
|
|
off_t size = zip_header->formatted.ucmpsize;
|
|
if (size)
|
|
bb_copyfd_exact_size(src_fd, dst_fd, size);
|
|
} else {
|
|
/* Method 8 - inflate */
|
|
inflate_init(zip_header->formatted.cmpsize);
|
|
inflate_unzip(src_fd, dst_fd);
|
|
inflate_cleanup();
|
|
/* Validate decompression - crc */
|
|
if (zip_header->formatted.crc32 != (gunzip_crc ^ 0xffffffffL)) {
|
|
bb_error_msg("invalid compressed data--%s error", "crc");
|
|
return 1;
|
|
}
|
|
/* Validate decompression - size */
|
|
if (zip_header->formatted.ucmpsize != gunzip_bytes_out) {
|
|
bb_error_msg("invalid compressed data--%s error", "length");
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int unzip_main(int argc, char **argv)
|
|
{
|
|
zip_header_t zip_header;
|
|
enum {v_silent, v_normal, v_list} verbosity = v_normal;
|
|
enum {o_prompt, o_never, o_always} overwrite = o_prompt;
|
|
unsigned int total_size = 0;
|
|
unsigned int total_entries = 0;
|
|
int src_fd = -1, dst_fd = -1;
|
|
char *src_fn = NULL, *dst_fn = NULL;
|
|
llist_t *zaccept = NULL;
|
|
llist_t *zreject = NULL;
|
|
char *base_dir = NULL;
|
|
int failed, i, opt, opt_range = 0, list_header_done = 0;
|
|
char key_buf[512];
|
|
struct stat stat_buf;
|
|
|
|
while ((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
|
|
switch (opt_range) {
|
|
case 0: /* Options */
|
|
switch (opt) {
|
|
case 'l': /* List */
|
|
verbosity = v_list;
|
|
break;
|
|
|
|
case 'n': /* Never overwrite existing files */
|
|
overwrite = o_never;
|
|
break;
|
|
|
|
case 'o': /* Always overwrite existing files */
|
|
overwrite = o_always;
|
|
break;
|
|
|
|
case 'p': /* Extract files to stdout and fall through to set verbosity */
|
|
dst_fd = STDOUT_FILENO;
|
|
|
|
case 'q': /* Be quiet */
|
|
verbosity = (verbosity == v_normal) ? v_silent : verbosity;
|
|
break;
|
|
|
|
case 1 : /* The zip file */
|
|
src_fn = xstrndup(optarg, strlen(optarg)+4);
|
|
opt_range++;
|
|
break;
|
|
|
|
default:
|
|
bb_show_usage();
|
|
|
|
}
|
|
break;
|
|
|
|
case 1: /* Include files */
|
|
if (opt == 1) {
|
|
llist_add_to(&zaccept, optarg);
|
|
|
|
} else if (opt == 'd') {
|
|
base_dir = optarg;
|
|
opt_range += 2;
|
|
|
|
} else if (opt == 'x') {
|
|
opt_range++;
|
|
|
|
} else {
|
|
bb_show_usage();
|
|
}
|
|
break;
|
|
|
|
case 2 : /* Exclude files */
|
|
if (opt == 1) {
|
|
llist_add_to(&zreject, optarg);
|
|
|
|
} else if (opt == 'd') { /* Extract to base directory */
|
|
base_dir = optarg;
|
|
opt_range++;
|
|
|
|
} else {
|
|
bb_show_usage();
|
|
}
|
|
break;
|
|
|
|
default:
|
|
bb_show_usage();
|
|
}
|
|
}
|
|
|
|
if (src_fn == NULL) {
|
|
bb_show_usage();
|
|
}
|
|
|
|
/* Open input file */
|
|
if (LONE_DASH(src_fn)) {
|
|
src_fd = STDIN_FILENO;
|
|
/* Cannot use prompt mode since zip data is arriving on STDIN */
|
|
overwrite = (overwrite == o_prompt) ? o_never : overwrite;
|
|
} else {
|
|
static const char *const extn[] = {"", ".zip", ".ZIP"};
|
|
int orig_src_fn_len = strlen(src_fn);
|
|
for (i = 0; (i < 3) && (src_fd == -1); i++) {
|
|
strcpy(src_fn + orig_src_fn_len, extn[i]);
|
|
src_fd = open(src_fn, O_RDONLY);
|
|
}
|
|
if (src_fd == -1) {
|
|
src_fn[orig_src_fn_len] = 0;
|
|
bb_error_msg_and_die("cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
|
|
}
|
|
}
|
|
|
|
/* Change dir if necessary */
|
|
if (base_dir)
|
|
xchdir(base_dir);
|
|
|
|
if (verbosity != v_silent)
|
|
printf("Archive: %s\n", src_fn);
|
|
|
|
failed = 0;
|
|
|
|
while (1) {
|
|
unsigned int magic;
|
|
|
|
/* Check magic number */
|
|
xread(src_fd, &magic, 4);
|
|
if (magic == ZIP_CDS_MAGIC) {
|
|
break;
|
|
} else if (magic != ZIP_FILEHEADER_MAGIC) {
|
|
bb_error_msg_and_die("invalid zip magic %08X", magic);
|
|
}
|
|
|
|
/* Read the file header */
|
|
xread(src_fd, zip_header.raw, 26);
|
|
zip_header.formatted.version = SWAP_LE32(zip_header.formatted.version);
|
|
zip_header.formatted.flags = SWAP_LE32(zip_header.formatted.flags);
|
|
zip_header.formatted.method = SWAP_LE32(zip_header.formatted.method);
|
|
zip_header.formatted.modtime = SWAP_LE32(zip_header.formatted.modtime);
|
|
zip_header.formatted.moddate = SWAP_LE32(zip_header.formatted.moddate);
|
|
zip_header.formatted.crc32 = SWAP_LE32(zip_header.formatted.crc32);
|
|
zip_header.formatted.cmpsize = SWAP_LE32(zip_header.formatted.cmpsize);
|
|
zip_header.formatted.ucmpsize = SWAP_LE32(zip_header.formatted.ucmpsize);
|
|
zip_header.formatted.filename_len = SWAP_LE32(zip_header.formatted.filename_len);
|
|
zip_header.formatted.extra_len = SWAP_LE32(zip_header.formatted.extra_len);
|
|
if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
|
|
bb_error_msg_and_die("unsupported compression method %d", zip_header.formatted.method);
|
|
}
|
|
|
|
/* Read filename */
|
|
free(dst_fn);
|
|
dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
|
|
xread(src_fd, dst_fn, zip_header.formatted.filename_len);
|
|
|
|
/* Skip extra header bytes */
|
|
unzip_skip(src_fd, zip_header.formatted.extra_len);
|
|
|
|
if ((verbosity == v_list) && !list_header_done){
|
|
puts(" Length Date Time Name\n"
|
|
" -------- ---- ---- ----");
|
|
list_header_done = 1;
|
|
}
|
|
|
|
/* Filter zip entries */
|
|
if (find_list_entry(zreject, dst_fn) ||
|
|
(zaccept && !find_list_entry(zaccept, dst_fn))) { /* Skip entry */
|
|
i = 'n';
|
|
|
|
} else { /* Extract entry */
|
|
total_size += zip_header.formatted.ucmpsize;
|
|
|
|
if (verbosity == v_list) { /* List entry */
|
|
unsigned int dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
|
|
printf("%9u %02u-%02u-%02u %02u:%02u %s\n",
|
|
zip_header.formatted.ucmpsize,
|
|
(dostime & 0x01e00000) >> 21,
|
|
(dostime & 0x001f0000) >> 16,
|
|
(((dostime & 0xfe000000) >> 25) + 1980) % 100,
|
|
(dostime & 0x0000f800) >> 11,
|
|
(dostime & 0x000007e0) >> 5,
|
|
dst_fn);
|
|
total_entries++;
|
|
i = 'n';
|
|
} else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
|
|
i = -1;
|
|
} else if (last_char_is(dst_fn, '/')) { /* Extract directory */
|
|
if (stat(dst_fn, &stat_buf) == -1) {
|
|
if (errno != ENOENT) {
|
|
bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
|
|
}
|
|
if (verbosity == v_normal) {
|
|
printf(" creating: %s\n", dst_fn);
|
|
}
|
|
unzip_create_leading_dirs(dst_fn);
|
|
if (bb_make_directory(dst_fn, 0777, 0)) {
|
|
bb_error_msg_and_die("exiting");
|
|
}
|
|
} else {
|
|
if (!S_ISDIR(stat_buf.st_mode)) {
|
|
bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
|
|
}
|
|
}
|
|
i = 'n';
|
|
|
|
} else { /* Extract file */
|
|
_check_file:
|
|
if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
|
|
if (errno != ENOENT) {
|
|
bb_perror_msg_and_die("cannot stat '%s'",dst_fn);
|
|
}
|
|
i = 'y';
|
|
} else { /* File already exists */
|
|
if (overwrite == o_never) {
|
|
i = 'n';
|
|
} else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
|
|
if (overwrite == o_always) {
|
|
i = 'y';
|
|
} else {
|
|
printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
|
|
if (!fgets(key_buf, 512, stdin)) {
|
|
bb_perror_msg_and_die("cannot read input");
|
|
}
|
|
i = key_buf[0];
|
|
}
|
|
} else { /* File is not regular file */
|
|
bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
switch (i) {
|
|
case 'A':
|
|
overwrite = o_always;
|
|
case 'y': /* Open file and fall into unzip */
|
|
unzip_create_leading_dirs(dst_fn);
|
|
dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
|
|
case -1: /* Unzip */
|
|
if (verbosity == v_normal) {
|
|
printf(" inflating: %s\n", dst_fn);
|
|
}
|
|
if (unzip_extract(&zip_header, src_fd, dst_fd)) {
|
|
failed = 1;
|
|
}
|
|
if (dst_fd != STDOUT_FILENO) {
|
|
/* closing STDOUT is potentially bad for future business */
|
|
close(dst_fd);
|
|
}
|
|
break;
|
|
|
|
case 'N':
|
|
overwrite = o_never;
|
|
case 'n':
|
|
/* Skip entry data */
|
|
unzip_skip(src_fd, zip_header.formatted.cmpsize);
|
|
break;
|
|
|
|
case 'r':
|
|
/* Prompt for new name */
|
|
printf("new name: ");
|
|
if (!fgets(key_buf, 512, stdin)) {
|
|
bb_perror_msg_and_die("cannot read input");
|
|
}
|
|
free(dst_fn);
|
|
dst_fn = xstrdup(key_buf);
|
|
chomp(dst_fn);
|
|
goto _check_file;
|
|
|
|
default:
|
|
printf("error: invalid response [%c]\n",(char)i);
|
|
goto _check_file;
|
|
}
|
|
|
|
/* Data descriptor section */
|
|
if (zip_header.formatted.flags & 4) {
|
|
/* skip over duplicate crc, compressed size and uncompressed size */
|
|
unzip_skip(src_fd, 12);
|
|
}
|
|
}
|
|
|
|
if (verbosity == v_list) {
|
|
printf(" -------- -------\n"
|
|
"%9d %d files\n", total_size, total_entries);
|
|
}
|
|
|
|
return failed;
|
|
}
|