/* 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 GPLv2 or later, see file LICENSE in this source tree. */ /* For reference see * http://www.pkware.com/company/standards/appnote/ * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip * * TODO * Zip64 + other methods */ //config:config UNZIP //config: bool "unzip" //config: default y //config: help //config: unzip will list or extract files from a ZIP archive, //config: commonly found on DOS/WIN systems. The default behavior //config: (with no options) is to extract the archive into the //config: current directory. //config: //config:config FEATURE_UNZIP_CDF //config: bool "Read and use Central Directory data" //config: default y //config: depends on UNZIP //config: help //config: If you know that you only need to deal with simple //config: ZIP files without deleted/updated files, SFX archives etc, //config: you can reduce code size by unselecting this option. //config: To support less trivial ZIPs, say Y. //config: //config:config FEATURE_UNZIP_BZIP2 //config: bool "Support compression method 12 (bzip2)" //config: default y //config: depends on FEATURE_UNZIP_CDF && DESKTOP // FEATURE_UNZIP_CDF is needed, otherwise we can't find start of next file // DESKTOP is needed to get back uncompressed length //config: //config:config FEATURE_UNZIP_LZMA //config: bool "Support compression method 14 (lzma)" //config: default y //config: depends on FEATURE_UNZIP_CDF && DESKTOP //applet:IF_UNZIP(APPLET(unzip, BB_DIR_USR_BIN, BB_SUID_DROP)) //kbuild:lib-$(CONFIG_UNZIP) += unzip.o //usage:#define unzip_trivial_usage //usage: "[-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]" //usage:#define unzip_full_usage "\n\n" //usage: "Extract FILEs from ZIP archive\n" //usage: "\n -l List contents (with -q for short form)" //usage: "\n -n Never overwrite files (default: ask)" //usage: "\n -o Overwrite" //usage: "\n -p Print to stdout" //usage: "\n -q Quiet" //usage: "\n -x FILE Exclude FILEs" //usage: "\n -d DIR Extract into DIR" #include "libbb.h" #include "bb_archive.h" #if 0 # define dbg(...) bb_error_msg(__VA_ARGS__) #else # define dbg(...) ((void)0) #endif enum { #if BB_BIG_ENDIAN ZIP_FILEHEADER_MAGIC = 0x504b0304, ZIP_CDF_MAGIC = 0x504b0102, /* CDF item */ ZIP_CDE_MAGIC = 0x504b0506, /* End of CDF */ ZIP_DD_MAGIC = 0x504b0708, #else ZIP_FILEHEADER_MAGIC = 0x04034b50, ZIP_CDF_MAGIC = 0x02014b50, ZIP_CDE_MAGIC = 0x06054b50, ZIP_DD_MAGIC = 0x08074b50, #endif }; #define ZIP_HEADER_LEN 26 typedef union { uint8_t raw[ZIP_HEADER_LEN]; struct { uint16_t version; /* 0-1 */ uint16_t zip_flags; /* 2-3 */ uint16_t method; /* 4-5 */ uint16_t modtime; /* 6-7 */ uint16_t moddate; /* 8-9 */ uint32_t crc32 PACKED; /* 10-13 */ uint32_t cmpsize PACKED; /* 14-17 */ uint32_t ucmpsize PACKED; /* 18-21 */ uint16_t filename_len; /* 22-23 */ uint16_t extra_len; /* 24-25 */ /* filename follows (not NUL terminated) */ /* extra field follows */ /* data follows */ } fmt PACKED; } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */ #define FIX_ENDIANNESS_ZIP(zip) \ do { if (BB_BIG_ENDIAN) { \ (zip).fmt.crc32 = SWAP_LE32((zip).fmt.crc32 ); \ (zip).fmt.cmpsize = SWAP_LE32((zip).fmt.cmpsize ); \ (zip).fmt.ucmpsize = SWAP_LE32((zip).fmt.ucmpsize ); \ (zip).fmt.filename_len = SWAP_LE16((zip).fmt.filename_len); \ (zip).fmt.extra_len = SWAP_LE16((zip).fmt.extra_len ); \ }} while (0) #define CDF_HEADER_LEN 42 typedef union { uint8_t raw[CDF_HEADER_LEN]; struct { /* uint32_t signature; 50 4b 01 02 */ uint16_t version_made_by; /* 0-1 */ uint16_t version_needed; /* 2-3 */ uint16_t cdf_flags; /* 4-5 */ uint16_t method; /* 6-7 */ uint16_t modtime; /* 8-9 */ uint16_t moddate; /* 10-11 */ uint32_t crc32; /* 12-15 */ uint32_t cmpsize; /* 16-19 */ uint32_t ucmpsize; /* 20-23 */ uint16_t filename_len; /* 24-25 */ uint16_t extra_len; /* 26-27 */ uint16_t file_comment_length; /* 28-29 */ uint16_t disk_number_start; /* 30-31 */ uint16_t internal_attributes; /* 32-33 */ uint32_t external_attributes PACKED; /* 34-37 */ uint32_t relative_offset_of_local_header PACKED; /* 38-41 */ /* filename follows (not NUL terminated) */ /* extra field follows */ /* file comment follows */ } fmt PACKED; } cdf_header_t; #define FIX_ENDIANNESS_CDF(cdf) \ do { if (BB_BIG_ENDIAN) { \ (cdf).fmt.version_made_by = SWAP_LE16((cdf).fmt.version_made_by); \ (cdf).fmt.version_needed = SWAP_LE16((cdf).fmt.version_needed); \ (cdf).fmt.method = SWAP_LE16((cdf).fmt.method ); \ (cdf).fmt.modtime = SWAP_LE16((cdf).fmt.modtime ); \ (cdf).fmt.moddate = SWAP_LE16((cdf).fmt.moddate ); \ (cdf).fmt.crc32 = SWAP_LE32((cdf).fmt.crc32 ); \ (cdf).fmt.cmpsize = SWAP_LE32((cdf).fmt.cmpsize ); \ (cdf).fmt.ucmpsize = SWAP_LE32((cdf).fmt.ucmpsize ); \ (cdf).fmt.filename_len = SWAP_LE16((cdf).fmt.filename_len); \ (cdf).fmt.extra_len = SWAP_LE16((cdf).fmt.extra_len ); \ (cdf).fmt.file_comment_length = SWAP_LE16((cdf).fmt.file_comment_length); \ (cdf).fmt.external_attributes = SWAP_LE32((cdf).fmt.external_attributes); \ }} while (0) #define CDE_LEN 16 typedef union { uint8_t raw[CDE_LEN]; struct { /* uint32_t signature; 50 4b 05 06 */ uint16_t this_disk_no; uint16_t disk_with_cdf_no; uint16_t cdf_entries_on_this_disk; uint16_t cdf_entries_total; uint32_t cdf_size; uint32_t cdf_offset; /* uint16_t archive_comment_length; */ /* archive comment follows */ } fmt PACKED; } cde_t; #define FIX_ENDIANNESS_CDE(cde) \ do { if (BB_BIG_ENDIAN) { \ (cde).fmt.cdf_offset = SWAP_LE32((cde).fmt.cdf_offset); \ }} while (0) struct BUG { /* Check the offset of the last element, not the length. This leniency * allows for poor packing, whereby the overall struct may be too long, * even though the elements are all in the right place. */ char BUG_zip_header_must_be_26_bytes[ offsetof(zip_header_t, fmt.extra_len) + 2 == ZIP_HEADER_LEN ? 1 : -1]; char BUG_cdf_header_must_be_42_bytes[ offsetof(cdf_header_t, fmt.relative_offset_of_local_header) + 4 == CDF_HEADER_LEN ? 1 : -1]; char BUG_cde_must_be_16_bytes[ sizeof(cde_t) == CDE_LEN ? 1 : -1]; }; enum { zip_fd = 3 }; /* This value means that we failed to find CDF */ #define BAD_CDF_OFFSET ((uint32_t)0xffffffff) #if !ENABLE_FEATURE_UNZIP_CDF # define find_cdf_offset() BAD_CDF_OFFSET #else /* Seen in the wild: * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive, * where CDE was nearly 48 kbytes before EOF. * (Surprisingly, it also apparently has *another* CDE structure * closer to the end, with bogus cdf_offset). * To make extraction work, bumped PEEK_FROM_END from 16k to 64k. */ #define PEEK_FROM_END (64*1024) /* NB: does not preserve file position! */ static uint32_t find_cdf_offset(void) { cde_t cde; unsigned char *buf; unsigned char *p; off_t end; uint32_t found; end = lseek(zip_fd, 0, SEEK_END); if (end == (off_t) -1) return BAD_CDF_OFFSET; end -= PEEK_FROM_END; if (end < 0) end = 0; dbg("Looking for cdf_offset starting from 0x%"OFF_FMT"x", end); xlseek(zip_fd, end, SEEK_SET); buf = xzalloc(PEEK_FROM_END); full_read(zip_fd, buf, PEEK_FROM_END); found = BAD_CDF_OFFSET; p = buf; while (p <= buf + PEEK_FROM_END - CDE_LEN - 4) { if (*p != 'P') { p++; continue; } if (*++p != 'K') continue; if (*++p != 5) continue; if (*++p != 6) continue; /* we found CDE! */ memcpy(cde.raw, p + 1, CDE_LEN); FIX_ENDIANNESS_CDE(cde); /* * I've seen .ZIP files with seemingly valid CDEs * where cdf_offset points past EOF - ?? * This check ignores such CDEs: */ if (cde.fmt.cdf_offset < end + (p - buf)) { found = cde.fmt.cdf_offset; dbg("Possible cdf_offset:0x%x at 0x%"OFF_FMT"x", (unsigned)found, end + (p-3 - buf)); dbg(" cdf_offset+cdf_size:0x%x", (unsigned)(found + SWAP_LE32(cde.fmt.cdf_size))); /* * We do not "break" here because only the last CDE is valid. * I've seen a .zip archive which contained a .zip file, * uncompressed, and taking the first CDE was using * the CDE inside that file! */ } } free(buf); dbg("Found cdf_offset:0x%x", (unsigned)found); return found; }; static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf) { uint32_t magic; if (cdf_offset == BAD_CDF_OFFSET) return cdf_offset; dbg("Reading CDF at 0x%x", (unsigned)cdf_offset); xlseek(zip_fd, cdf_offset, SEEK_SET); xread(zip_fd, &magic, 4); /* Central Directory End? Assume CDF has ended. * (more correct method is to use cde.cdf_entries_total counter) */ if (magic == ZIP_CDE_MAGIC) { dbg("got ZIP_CDE_MAGIC"); return 0; /* EOF */ } xread(zip_fd, cdf->raw, CDF_HEADER_LEN); FIX_ENDIANNESS_CDF(*cdf); dbg(" filename_len:%u extra_len:%u file_comment_length:%u", (unsigned)cdf->fmt.filename_len, (unsigned)cdf->fmt.extra_len, (unsigned)cdf->fmt.file_comment_length ); cdf_offset += 4 + CDF_HEADER_LEN + cdf->fmt.filename_len + cdf->fmt.extra_len + cdf->fmt.file_comment_length; return cdf_offset; }; #endif static void unzip_skip(off_t skip) { if (skip != 0) if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1) bb_copyfd_exact_size(zip_fd, -1, skip); } static void unzip_create_leading_dirs(const char *fn) { /* Create all leading directories */ char *name = xstrdup(fn); if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) { xfunc_die(); /* bb_make_directory is noisy */ } free(name); } static void unzip_extract(zip_header_t *zip, int dst_fd) { transformer_state_t xstate; if (zip->fmt.method == 0) { /* Method 0 - stored (not compressed) */ off_t size = zip->fmt.ucmpsize; if (size) bb_copyfd_exact_size(zip_fd, dst_fd, size); return; } init_transformer_state(&xstate); xstate.bytes_in = zip->fmt.cmpsize; xstate.src_fd = zip_fd; xstate.dst_fd = dst_fd; if (zip->fmt.method == 8) { /* Method 8 - inflate */ if (inflate_unzip(&xstate) < 0) bb_error_msg_and_die("inflate error"); /* Validate decompression - crc */ if (zip->fmt.crc32 != (xstate.crc32 ^ 0xffffffffL)) { bb_error_msg_and_die("crc error"); } } #if ENABLE_FEATURE_UNZIP_BZIP2 else if (zip->fmt.method == 12) { /* Tested. Unpacker reads too much, but we use CDF * and will seek to the correct beginning of next file. */ xstate.bytes_out = unpack_bz2_stream(&xstate); if (xstate.bytes_out < 0) bb_error_msg_and_die("inflate error"); } #endif #if ENABLE_FEATURE_UNZIP_LZMA else if (zip->fmt.method == 14) { /* Not tested yet */ xstate.bytes_out = unpack_lzma_stream(&xstate); if (xstate.bytes_out < 0) bb_error_msg_and_die("inflate error"); } #endif else { bb_error_msg_and_die("unsupported method %u", zip->fmt.method); } /* Validate decompression - size */ if (zip->fmt.ucmpsize != xstate.bytes_out) { /* Don't die. Who knows, maybe len calculation * was botched somewhere. After all, crc matched! */ bb_error_msg("bad length"); } } static void my_fgets80(char *buf80) { fflush_all(); if (!fgets(buf80, 80, stdin)) { bb_perror_msg_and_die("can't read standard input"); } } int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int unzip_main(int argc, char **argv) { enum { O_PROMPT, O_NEVER, O_ALWAYS }; smallint quiet = 0; IF_NOT_FEATURE_UNZIP_CDF(const) smallint verbose = 0; smallint listing = 0; smallint overwrite = O_PROMPT; smallint x_opt_seen; uint32_t cdf_offset; unsigned long total_usize; unsigned long total_size; unsigned total_entries; int dst_fd = -1; char *src_fn = NULL; char *dst_fn = NULL; llist_t *zaccept = NULL; llist_t *zreject = NULL; char *base_dir = NULL; int i, opt; char key_buf[80]; /* must match size used by my_fgets80 */ struct stat stat_buf; /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP: * * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i * # /usr/bin/unzip -q -v decompress_unlzma.i.zip * Length Method Size Ratio Date Time CRC-32 Name * -------- ------ ------- ----- ---- ---- ------ ---- * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i * -------- ------- --- ------- * 204372 35278 83% 1 file * # /usr/bin/unzip -v decompress_unlzma.i.zip * Archive: decompress_unlzma.i.zip * Length Method Size Ratio Date Time CRC-32 Name * -------- ------ ------- ----- ---- ---- ------ ---- * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i * -------- ------- --- ------- * 204372 35278 83% 1 file * # unzip -v decompress_unlzma.i.zip * Archive: decompress_unlzma.i.zip * Length Date Time Name * -------- ---- ---- ---- * 204372 09-06-09 14:23 decompress_unlzma.i * -------- ------- * 204372 1 files * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip * 204372 09-06-09 14:23 decompress_unlzma.i * # /usr/bin/unzip -l -q decompress_unlzma.i.zip * Length Date Time Name * -------- ---- ---- ---- * 204372 09-06-09 14:23 decompress_unlzma.i * -------- ------- * 204372 1 file * # /usr/bin/unzip -l decompress_unlzma.i.zip * Archive: decompress_unlzma.i.zip * Length Date Time Name * -------- ---- ---- ---- * 204372 09-06-09 14:23 decompress_unlzma.i * -------- ------- * 204372 1 file */ x_opt_seen = 0; /* '-' makes getopt return 1 for non-options */ while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) { switch (opt) { case 'd': /* Extract to base directory */ base_dir = optarg; break; case 'l': /* List */ listing = 1; 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 */ quiet++; break; case 'v': /* Verbose list */ IF_FEATURE_UNZIP_CDF(verbose++;) listing = 1; break; case 'x': x_opt_seen = 1; break; case 1: if (!src_fn) { /* The zip file */ /* +5: space for ".zip" and NUL */ src_fn = xmalloc(strlen(optarg) + 5); strcpy(src_fn, optarg); } else if (!x_opt_seen) { /* Include files */ llist_add_to(&zaccept, optarg); } else { /* Exclude files */ llist_add_to(&zreject, optarg); } break; default: bb_show_usage(); } } #ifndef __GLIBC__ /* * This code is needed for non-GNU getopt * which doesn't understand "-" in option string. * The -x option won't work properly in this case: * "unzip a.zip q -x w e" will be interpreted as * "unzip a.zip q w e -x" = "unzip a.zip q w e" */ argv += optind; if (argv[0]) { /* +5: space for ".zip" and NUL */ src_fn = xmalloc(strlen(argv[0]) + 5); strcpy(src_fn, argv[0]); while (*++argv) llist_add_to(&zaccept, *argv); } #endif if (!src_fn) { bb_show_usage(); } /* Open input file */ if (LONE_DASH(src_fn)) { xdup2(STDIN_FILENO, zip_fd); /* Cannot use prompt mode since zip data is arriving on STDIN */ if (overwrite == O_PROMPT) overwrite = O_NEVER; } else { static const char extn[][5] ALIGN1 = { ".zip", ".ZIP" }; char *ext = src_fn + strlen(src_fn); int src_fd; i = 0; for (;;) { src_fd = open(src_fn, O_RDONLY); if (src_fd >= 0) break; if (++i > 2) { *ext = '\0'; bb_error_msg_and_die("can't open %s[.zip]", src_fn); } strcpy(ext, extn[i - 1]); } xmove_fd(src_fd, zip_fd); } /* Change dir if necessary */ if (base_dir) xchdir(base_dir); if (quiet <= 1) { /* not -qq */ if (quiet == 0) printf("Archive: %s\n", src_fn); if (listing) { puts(verbose ? " Length Method Size Cmpr Date Time CRC-32 Name\n" "-------- ------ ------- ---- ---------- ----- -------- ----" : " Length Date Time Name\n" "--------- ---------- ----- ----" ); } } /* Example of an archive with one 0-byte long file named 'z' * created by Zip 2.31 on Unix: * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..| * sig........ vneed flags compr mtime mdate crc32> * 0010 00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU| * >..... csize...... usize...... fnlen exlen fn ex> * 0020 54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..| * >tra_field...................................... * 0030 00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........| * ........... sig........ vmade vneed flags compr * 0040 42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............| * mtime mdate crc32...... csize...... usize...... * 0050 01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................| * fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--) * 0060 00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..| * >..... fn extra_field........................... * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...| * 0080 34 00 00 00 00 00 |4.....| */ total_usize = 0; total_size = 0; total_entries = 0; cdf_offset = find_cdf_offset(); /* try to seek to the end, find CDE and CDF start */ while (1) { zip_header_t zip; mode_t dir_mode = 0777; #if ENABLE_FEATURE_UNZIP_CDF mode_t file_mode = 0666; #endif if (!ENABLE_FEATURE_UNZIP_CDF || cdf_offset == BAD_CDF_OFFSET) { /* Normally happens when input is unseekable. * * Valid ZIP file has Central Directory at the end * with central directory file headers (CDFs). * After it, there is a Central Directory End structure. * CDFs identify what files are in the ZIP and where * they are located. This allows ZIP readers to load * the list of files without reading the entire ZIP archive. * ZIP files may be appended to, only files specified in * the CD are valid. Scanning for local file headers is * not a correct algorithm. * * We try to do the above, and resort to "linear" reading * of ZIP file only if seek failed or CDE wasn't found. */ uint32_t magic; /* Check magic number */ xread(zip_fd, &magic, 4); /* CDF item? Assume there are no more files, exit */ if (magic == ZIP_CDF_MAGIC) { dbg("got ZIP_CDF_MAGIC"); break; } /* Data descriptor? It was a streaming file, go on */ if (magic == ZIP_DD_MAGIC) { dbg("got ZIP_DD_MAGIC"); /* skip over duplicate crc32, cmpsize and ucmpsize */ unzip_skip(3 * 4); continue; } if (magic != ZIP_FILEHEADER_MAGIC) bb_error_msg_and_die("invalid zip magic %08X", (int)magic); dbg("got ZIP_FILEHEADER_MAGIC"); xread(zip_fd, zip.raw, ZIP_HEADER_LEN); FIX_ENDIANNESS_ZIP(zip); if (zip.fmt.zip_flags & SWAP_LE16(0x0009)) { bb_error_msg_and_die("zip flags 1 and 8 are not supported"); } } #if ENABLE_FEATURE_UNZIP_CDF else { /* cdf_offset is valid (and we know the file is seekable) */ cdf_header_t cdf; cdf_offset = read_next_cdf(cdf_offset, &cdf); if (cdf_offset == 0) /* EOF? */ break; # if 1 xlseek(zip_fd, SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4, SEEK_SET); xread(zip_fd, zip.raw, ZIP_HEADER_LEN); FIX_ENDIANNESS_ZIP(zip); if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) { /* 0x0008 - streaming. [u]cmpsize can be reliably gotten * only from Central Directory. */ zip.fmt.crc32 = cdf.fmt.crc32; zip.fmt.cmpsize = cdf.fmt.cmpsize; zip.fmt.ucmpsize = cdf.fmt.ucmpsize; } # else /* CDF has the same data as local header, no need to read the latter... * ...not really. An archive was seen with cdf.extra_len == 6 but * zip.extra_len == 0. */ memcpy(&zip.fmt.version, &cdf.fmt.version_needed, ZIP_HEADER_LEN); xlseek(zip_fd, SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4 + ZIP_HEADER_LEN, SEEK_SET); # endif if ((cdf.fmt.version_made_by >> 8) == 3) { /* This archive is created on Unix */ dir_mode = file_mode = (cdf.fmt.external_attributes >> 16); } } #endif if (zip.fmt.zip_flags & SWAP_LE16(0x0001)) { /* 0x0001 - encrypted */ bb_error_msg_and_die("zip flag 1 (encryption) is not supported"); } dbg("File cmpsize:0x%x extra_len:0x%x ucmpsize:0x%x", (unsigned)zip.fmt.cmpsize, (unsigned)zip.fmt.extra_len, (unsigned)zip.fmt.ucmpsize ); /* Read filename */ free(dst_fn); dst_fn = xzalloc(zip.fmt.filename_len + 1); xread(zip_fd, dst_fn, zip.fmt.filename_len); /* Skip extra header bytes */ unzip_skip(zip.fmt.extra_len); /* Guard against "/abspath", "/../" and similar attacks */ overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn)); /* Filter zip entries */ if (find_list_entry(zreject, dst_fn) || (zaccept && !find_list_entry(zaccept, dst_fn)) ) { /* Skip entry */ i = 'n'; } else { if (listing) { /* List entry */ char dtbuf[sizeof("mm-dd-yyyy hh:mm")]; sprintf(dtbuf, "%02u-%02u-%04u %02u:%02u", (zip.fmt.moddate >> 5) & 0xf, // mm: 0x01e0 (zip.fmt.moddate) & 0x1f, // dd: 0x001f (zip.fmt.moddate >> 9) + 1980, // yy: 0xfe00 (zip.fmt.modtime >> 11), // hh: 0xf800 (zip.fmt.modtime >> 5) & 0x3f // mm: 0x07e0 // seconds/2 not shown, encoded in -- 0x001f ); if (!verbose) { // " Length Date Time Name\n" // "--------- ---------- ----- ----" printf( "%9u " "%s " "%s\n", (unsigned)zip.fmt.ucmpsize, dtbuf, dst_fn); } else { char method6[7]; unsigned long percents; sprintf(method6, "%6u", zip.fmt.method); percents = zip.fmt.ucmpsize - zip.fmt.cmpsize; if ((int32_t)percents < 0) percents = 0; /* happens if ucmpsize < cmpsize */ percents = percents * 100; if (zip.fmt.ucmpsize) percents /= zip.fmt.ucmpsize; // " Length Method Size Cmpr Date Time CRC-32 Name\n" // "-------- ------ ------- ---- ---------- ----- -------- ----" printf( "%8u %s" "%9u%4u%% " "%s " "%08x " "%s\n", (unsigned)zip.fmt.ucmpsize, zip.fmt.method == 0 ? "Stored" : zip.fmt.method == 8 ? "Defl:N" : method6, (unsigned)zip.fmt.cmpsize, (unsigned)percents, dtbuf, zip.fmt.crc32, dst_fn); total_size += zip.fmt.cmpsize; } total_usize += zip.fmt.ucmpsize; 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("can't stat '%s'", dst_fn); } if (!quiet) { printf(" creating: %s\n", dst_fn); } unzip_create_leading_dirs(dst_fn); if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) { xfunc_die(); } } else { if (!S_ISDIR(stat_buf.st_mode)) { bb_error_msg_and_die("'%s' exists but is not a %s", dst_fn, "directory"); } } 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("can't 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); my_fgets80(key_buf); i = key_buf[0]; } } else { /* File is not regular file */ bb_error_msg_and_die("'%s' exists but is not a %s", dst_fn, "regular file"); } } } } switch (i) { case 'A': overwrite = O_ALWAYS; case 'y': /* Open file and fall into unzip */ unzip_create_leading_dirs(dst_fn); #if ENABLE_FEATURE_UNZIP_CDF dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode); #else dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC); #endif case -1: /* Unzip */ if (!quiet) { printf(/* zip.fmt.method == 0 ? " extracting: %s\n" : */ " inflating: %s\n", dst_fn); } unzip_extract(&zip, dst_fd); 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(zip.fmt.cmpsize); break; case 'r': /* Prompt for new name */ printf("new name: "); my_fgets80(key_buf); 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; } total_entries++; } if (listing && quiet <= 1) { if (!verbose) { // " Length Date Time Name\n" // "--------- ---------- ----- ----" printf( " --------%21s" "-------\n" "%9lu%21s" "%u files\n", "", total_usize, "", total_entries); } else { unsigned long percents = total_usize - total_size; if ((long)percents < 0) percents = 0; /* happens if usize < size */ percents = percents * 100; if (total_usize) percents /= total_usize; // " Length Method Size Cmpr Date Time CRC-32 Name\n" // "-------- ------ ------- ---- ---------- ----- -------- ----" printf( "-------- ------- ----%28s" "----\n" "%8lu" "%17lu%4u%%%28s" "%u files\n", "", total_usize, total_size, (unsigned)percents, "", total_entries); } } return 0; }