X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=archival%2Funzip.c;h=8ba39e9af936440d576cd36b9cae0ffd835b6a77;hb=768945b762b8850691acd2b63116eed18faa1812;hp=ae0d7c1dc56f324e192327d10526823db01b94e3;hpb=87ac7028e01cdc4f504ea558a6ae3d086ed1bf2b;p=oweals%2Fbusybox.git

diff --git a/archival/unzip.c b/archival/unzip.c
index ae0d7c1dc..8ba39e9af 100644
--- a/archival/unzip.c
+++ b/archival/unzip.c
@@ -2,93 +2,417 @@
 /*
  * Mini unzip implementation for busybox
  *
- * Copyright (C) 2001 by Laurence Anderson
+ * Copyright (C) 2004 by Ed Clark
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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 <fcntl.h>
-#include <getopt.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 #include "unarchive.h"
 #include "busybox.h"
 
-extern int unzip_main(int argc, char **argv)
+#if BB_BIG_ENDIAN
+static inline unsigned short
+__swap16(unsigned short x) {
+	return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
+}
+
+static inline uint32_t
+__swap32(uint32_t x) {
+	 return (((x & 0xFF) << 24) |
+		((x & 0xFF00) << 8) |
+		((x & 0xFF0000) >> 8) |
+		((x & 0xFF000000) >> 24));
+}
+#else /* it's little-endian */
+# define __swap16(x) (x)
+# define __swap32(x) (x)
+#endif /* BB_BIG_ENDIAN */
+
+#define ZIP_FILEHEADER_MAGIC		__swap32(0x04034b50)
+#define ZIP_CDS_MAGIC			__swap32(0x02014b50)
+#define ZIP_CDS_END_MAGIC		__swap32(0x06054b50)
+#define ZIP_DD_MAGIC			__swap32(0x08074b50)
+
+extern unsigned int gunzip_crc;
+extern unsigned int gunzip_bytes_out;
+
+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 */
+	} formated ATTRIBUTE_PACKED;
+} zip_header_t;
+
+static void unzip_skip(int fd, off_t skip)
 {
-	FILE *src_stream;
-	int extract_function = extract_all_to_fs | extract_create_leading_dirs;
-	char **extract_names = NULL;
-	char **exclude_names = NULL;
-	int opt = 0;
-	int num_of_entries = 0;
-	int exclude = 0;
-	char *outdir = "./";
-	FILE *msgout = stdout;
-
-	while ((opt = getopt(argc, argv, "lnopqxd:")) != -1) {
-		switch (opt) {
-			case 'l':
-				extract_function |= extract_verbose_list;
-				extract_function ^= extract_all_to_fs;
-				break;
-			case 'n':
+	if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
+		if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
+			bb_error_msg_and_die("Seek failure");
+		}
+	}
+}
+
+static void unzip_read(int fd, void *buf, size_t count)
+{
+	if (bb_xread(fd, buf, count) != count) {
+		bb_error_msg_and_die(bb_msg_read_error);
+	}
+}
+
+static void unzip_create_leading_dirs(char *fn)
+{
+	/* Create all leading directories */
+	char *name = bb_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->formated.method == 0) {
+		/* Method 0 - stored (not compressed) */
+		int size = zip_header->formated.ucmpsize;
+		if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
+			bb_error_msg_and_die("Cannot complete extraction");
+		}
+
+	} else {
+		/* Method 8 - inflate */
+		inflate_init(zip_header->formated.cmpsize);
+		inflate_unzip(src_fd, dst_fd);
+		inflate_cleanup();
+		/* Validate decompression - crc */
+		if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
+			bb_error_msg("Invalid compressed data--crc error");
+			return 1;
+		}
+		/* Validate decompression - size */
+		if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
+			bb_error_msg("Invalid compressed data--length error");
+			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 'o':
-				extract_function |= extract_unconditional;
+
+			case 'n': /* Never overwrite existing files */
+				overwrite = o_never;
 				break;
-			case 'p':
-				extract_function |= extract_to_stdout;
-				extract_function ^= extract_all_to_fs;
-				/* FALLTHROUGH */
-			case 'q':
-				msgout = xfopen("/dev/null", "w");
+
+			case 'o': /* Always overwrite existing files */
+				overwrite = o_always;
 				break;
-			case 'd':
-				outdir = xstrdup(optarg);
-				strcat(outdir, "/");
+
+			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 'x':
-				exclude = 1;
+
+			case 1 : /* The zip file */
+				src_fn = bb_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 (optind == argc) {
-		show_usage();
+	if (src_fn == NULL) {
+		bb_show_usage();
 	}
 
-	if (*argv[optind] == '-') src_stream = stdin;
-	else src_stream = xfopen(argv[optind++], "r");
+	/* Open input file */
+	if (strcmp("-", src_fn) == 0) {
+		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)
+		bb_xchdir(base_dir);
+
+	if (verbosity != v_silent)
+		printf("Archive:  %s\n", src_fn);
+
+	failed = 0;
+
+	while (1) {
+		unsigned int magic;
+
+		/* Check magic number */
+		unzip_read(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 */
+		unzip_read(src_fd, zip_header.raw, 26);
+#if BB_BIG_ENDIAN
+		zip_header.formated.version = __swap16(zip_header.formated.version);
+		zip_header.formated.flags = __swap16(zip_header.formated.flags);
+		zip_header.formated.method = __swap16(zip_header.formated.method);
+		zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
+		zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
+		zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
+		zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
+		zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
+		zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
+		zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
+#endif /* BB_BIG_ENDIAN */
+		if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
+			bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.method);
+		}
+
+		/* Read filename */
+		free(dst_fn);
+		dst_fn = xzalloc(zip_header.formated.filename_len + 1);
+		unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
+
+		/* Skip extra header bytes */
+		unzip_skip(src_fd, zip_header.formated.extra_len);
 
-	while (optind < argc) {
-		if (exclude) {
-			exclude_names = xrealloc(exclude_names, sizeof(char *) * (num_of_entries + 2));
-			exclude_names[num_of_entries] = xstrdup(argv[optind]);
-		} else {
-			extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
-			extract_names[num_of_entries] = xstrdup(argv[optind]);
+		if ((verbosity == v_list) && !list_header_done){
+			printf("  Length     Date   Time    Name\n"
+				   " --------    ----   ----    ----\n");
+			list_header_done = 1;
 		}
-		num_of_entries++;
-		if (exclude) exclude_names[num_of_entries] = NULL;
-		else extract_names[num_of_entries] = NULL;
-		optind++;
+
+		/* 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.formated.ucmpsize;
+
+			if (verbosity == v_list) { /* List entry */
+				unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
+				printf("%9u  %02u-%02u-%02u %02u:%02u   %s\n",
+					   zip_header.formated.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 = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
+		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.formated.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 = bb_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.formated.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);
 	}
 
-	unarchive(src_stream, msgout, &get_header_zip, extract_function, outdir, extract_names, exclude_names);
-	return EXIT_SUCCESS;
+	return failed;
 }