542 lines
16 KiB
C
542 lines
16 KiB
C
/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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/* #include <stdint.h> */ /* See archive_platform.h */
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "archive.h"
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#include "archive_entry.h"
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#include "archive_private.h"
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struct cpio_bin_header {
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unsigned char c_magic[2];
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unsigned char c_dev[2];
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unsigned char c_ino[2];
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unsigned char c_mode[2];
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unsigned char c_uid[2];
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unsigned char c_gid[2];
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unsigned char c_nlink[2];
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unsigned char c_rdev[2];
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unsigned char c_mtime[4];
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unsigned char c_namesize[2];
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unsigned char c_filesize[4];
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};
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struct cpio_odc_header {
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char c_magic[6];
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char c_dev[6];
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char c_ino[6];
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char c_mode[6];
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char c_uid[6];
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char c_gid[6];
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char c_nlink[6];
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char c_rdev[6];
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char c_mtime[11];
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char c_namesize[6];
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char c_filesize[11];
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};
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struct cpio_newc_header {
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char c_magic[6];
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char c_ino[8];
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char c_mode[8];
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char c_uid[8];
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char c_gid[8];
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char c_nlink[8];
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char c_mtime[8];
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char c_filesize[8];
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char c_devmajor[8];
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char c_devminor[8];
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char c_rdevmajor[8];
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char c_rdevminor[8];
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char c_namesize[8];
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char c_crc[8];
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};
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struct links_entry {
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struct links_entry *next;
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struct links_entry *previous;
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int links;
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dev_t dev;
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ino_t ino;
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char *name;
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};
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#define CPIO_MAGIC 0x13141516
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struct cpio {
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int magic;
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int (*read_header)(struct archive *, struct stat *,
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size_t *, size_t *);
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struct links_entry *links_head;
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struct archive_string entry_name;
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struct archive_string entry_linkname;
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};
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static int64_t atol16(const char *, unsigned);
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static int64_t atol8(const char *, unsigned);
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static int archive_read_format_cpio_bid(struct archive *);
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static int archive_read_format_cpio_cleanup(struct archive *);
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static int archive_read_format_cpio_read_header(struct archive *,
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struct archive_entry *);
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static int be4(const unsigned char *);
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static int header_bin_be(struct archive *, struct stat *,
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size_t *, size_t *);
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static int header_bin_le(struct archive *, struct stat *,
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size_t *, size_t *);
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static int header_newc(struct archive *, struct stat *,
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size_t *, size_t *);
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static int header_odc(struct archive *, struct stat *,
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size_t *, size_t *);
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static int le4(const unsigned char *);
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static void record_hardlink(struct cpio *cpio, struct archive_entry *entry,
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const struct stat *st);
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int
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archive_read_support_format_cpio(struct archive *a)
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{
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struct cpio *cpio;
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int r;
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cpio = malloc(sizeof(*cpio));
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memset(cpio, 0, sizeof(*cpio));
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cpio->magic = CPIO_MAGIC;
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r = __archive_read_register_format(a,
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cpio,
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archive_read_format_cpio_bid,
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archive_read_format_cpio_read_header,
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archive_read_format_cpio_cleanup);
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if (r != ARCHIVE_OK)
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free(cpio);
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return (ARCHIVE_OK);
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}
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static int
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archive_read_format_cpio_bid(struct archive *a)
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{
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int bid, bytes_read;
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const void *h;
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const unsigned char *p;
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struct cpio *cpio;
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cpio = *(a->pformat_data);
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bid = 0;
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bytes_read = (a->compression_read_ahead)(a, &h, 6);
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if (bytes_read < 6)
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return (-1);
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p = h;
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if (memcmp(p, "070707", 6) == 0) {
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/* ASCII cpio archive (odc, POSIX.1) */
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cpio->read_header = header_odc;
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bid += 48;
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/*
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* XXX TODO: More verification; Could check that only octal
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* digits appear in appropriate header locations. XXX
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*/
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} else if (memcmp(p, "070701", 6) == 0) {
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/* ASCII cpio archive (SVR4 without CRC) */
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cpio->read_header = header_newc;
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bid += 48;
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/*
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* XXX TODO: More verification; Could check that only hex
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* digits appear in appropriate header locations. XXX
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*/
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} else if (memcmp(p, "070702", 6) == 0) {
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/* ASCII cpio archive (SVR4 with CRC) */
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/* XXX TODO: Flag that we should check the CRC. XXX */
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cpio->read_header = header_newc;
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bid += 48;
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/*
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* XXX TODO: More verification; Could check that only hex
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* digits appear in appropriate header locations. XXX
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*/
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} else if (p[0] * 256 + p[1] == 070707) {
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/* big-endian binary cpio archives */
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cpio->read_header = header_bin_be;
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bid += 16;
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/* Is more verification possible here? */
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} else if (p[0] + p[1] * 256 == 070707) {
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/* little-endian binary cpio archives */
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cpio->read_header = header_bin_le;
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bid += 16;
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/* Is more verification possible here? */
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} else
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return (ARCHIVE_WARN);
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return (bid);
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}
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static int
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archive_read_format_cpio_read_header(struct archive *a,
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struct archive_entry *entry)
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{
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struct stat st;
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struct cpio *cpio;
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size_t bytes;
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const void *h;
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size_t namelength;
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size_t name_pad;
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int r;
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memset(&st, 0, sizeof(st));
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cpio = *(a->pformat_data);
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r = (cpio->read_header(a, &st, &namelength, &name_pad));
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if (r != ARCHIVE_OK)
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return (r);
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/* Assign all of the 'stat' fields at once. */
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archive_entry_copy_stat(entry, &st);
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/* Read name from buffer. */
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bytes = (a->compression_read_ahead)(a, &h, namelength + name_pad);
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if (bytes < namelength + name_pad)
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return (ARCHIVE_FATAL);
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(a->compression_read_consume)(a, namelength + name_pad);
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archive_strncpy(&cpio->entry_name, h, namelength);
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archive_entry_set_pathname(entry, cpio->entry_name.s);
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/* If this is a symlink, read the link contents. */
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if (S_ISLNK(st.st_mode)) {
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bytes = (a->compression_read_ahead)(a, &h,
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a->entry_bytes_remaining);
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if ((off_t)bytes < a->entry_bytes_remaining)
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return (ARCHIVE_FATAL);
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(a->compression_read_consume)(a, a->entry_bytes_remaining);
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archive_strncpy(&cpio->entry_linkname, h,
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a->entry_bytes_remaining);
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archive_entry_set_symlink(entry, cpio->entry_linkname.s);
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a->entry_bytes_remaining = 0;
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}
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/* Compare name to "TRAILER!!!" to test for end-of-archive. */
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if (namelength == 11 && strcmp(h,"TRAILER!!!")==0) {
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/* TODO: Store file location of start of block. */
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archive_set_error(a, 0, NULL);
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return (ARCHIVE_EOF);
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}
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/* Detect and record hardlinks to previously-extracted entries. */
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record_hardlink(cpio, entry, &st);
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return (ARCHIVE_OK);
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}
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static int
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header_newc(struct archive *a, struct stat *st,
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size_t *namelength, size_t *name_pad)
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{
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const void *h;
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const struct cpio_newc_header *header;
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size_t bytes;
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a->archive_format = ARCHIVE_FORMAT_CPIO;
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a->archive_format_name = "ASCII cpio (SVR4 with no CRC)";
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/* Read fixed-size portion of header. */
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bytes = (a->compression_read_ahead)(a, &h, sizeof(struct cpio_newc_header));
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if (bytes < sizeof(struct cpio_newc_header))
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return (ARCHIVE_FATAL);
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(a->compression_read_consume)(a, sizeof(struct cpio_newc_header));
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/* Parse out hex fields into struct stat. */
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header = h;
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st->st_ino = atol16(header->c_ino, sizeof(header->c_ino));
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st->st_mode = atol16(header->c_mode, sizeof(header->c_mode));
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st->st_uid = atol16(header->c_uid, sizeof(header->c_uid));
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st->st_gid = atol16(header->c_gid, sizeof(header->c_gid));
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st->st_nlink = atol16(header->c_nlink, sizeof(header->c_nlink));
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st->st_mtime = atol16(header->c_mtime, sizeof(header->c_mtime));
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*namelength = atol16(header->c_namesize, sizeof(header->c_namesize));
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/* Pad name to 2 more than a multiple of 4. */
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*name_pad = (2 - *namelength) & 3;
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/*
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* Note: entry_bytes_remaining is at least 64 bits and
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* therefore gauranteed to be big enough for a 33-bit file
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* size. struct stat.st_size may only be 32 bits, so
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* assigning there first could lose information.
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*/
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a->entry_bytes_remaining =
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atol16(header->c_filesize, sizeof(header->c_filesize));
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st->st_size = a->entry_bytes_remaining;
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/* Pad file contents to a multiple of 4. */
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a->entry_padding = 3 & -a->entry_bytes_remaining;
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return (ARCHIVE_OK);
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}
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static int
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header_odc(struct archive *a, struct stat *st,
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size_t *namelength, size_t *name_pad)
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{
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const void *h;
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const struct cpio_odc_header *header;
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size_t bytes;
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a->archive_format = ARCHIVE_FORMAT_CPIO;
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a->archive_format_name = "POSIX octet-oriented cpio";
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/* Read fixed-size portion of header. */
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bytes = (a->compression_read_ahead)(a, &h, sizeof(struct cpio_odc_header));
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if (bytes < sizeof(struct cpio_odc_header))
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return (ARCHIVE_FATAL);
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(a->compression_read_consume)(a, sizeof(struct cpio_odc_header));
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/* Parse out octal fields into struct stat. */
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header = h;
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st->st_dev = atol8(header->c_dev, sizeof(header->c_dev));
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st->st_ino = atol8(header->c_ino, sizeof(header->c_ino));
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st->st_mode = atol8(header->c_mode, sizeof(header->c_mode));
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st->st_uid = atol8(header->c_uid, sizeof(header->c_uid));
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st->st_gid = atol8(header->c_gid, sizeof(header->c_gid));
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st->st_nlink = atol8(header->c_nlink, sizeof(header->c_nlink));
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st->st_rdev = atol8(header->c_rdev, sizeof(header->c_rdev));
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st->st_mtime = atol8(header->c_mtime, sizeof(header->c_mtime));
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*namelength = atol8(header->c_namesize, sizeof(header->c_namesize));
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*name_pad = 0; /* No padding of filename. */
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/*
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* Note: entry_bytes_remaining is at least 64 bits and
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* therefore gauranteed to be big enough for a 33-bit file
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* size. struct stat.st_size may only be 32 bits, so
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* assigning there first could lose information.
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*/
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a->entry_bytes_remaining =
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atol8(header->c_filesize, sizeof(header->c_filesize));
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st->st_size = a->entry_bytes_remaining;
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a->entry_padding = 0;
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return (ARCHIVE_OK);
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}
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static int
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header_bin_le(struct archive *a, struct stat *st,
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size_t *namelength, size_t *name_pad)
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{
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const void *h;
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const struct cpio_bin_header *header;
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size_t bytes;
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a->archive_format = ARCHIVE_FORMAT_CPIO;
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a->archive_format_name = "cpio (little-endian binary)";
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/* Read fixed-size portion of header. */
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bytes = (a->compression_read_ahead)(a, &h, sizeof(struct cpio_bin_header));
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if (bytes < sizeof(struct cpio_bin_header))
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return (ARCHIVE_FATAL);
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(a->compression_read_consume)(a, sizeof(struct cpio_bin_header));
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/* Parse out binary fields into struct stat. */
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header = h;
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st->st_dev = header->c_dev[0] + header->c_dev[1] * 256;
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st->st_ino = header->c_ino[0] + header->c_ino[1] * 256;
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st->st_mode = header->c_mode[0] + header->c_mode[1] * 256;
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st->st_uid = header->c_uid[0] + header->c_uid[1] * 256;
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st->st_gid = header->c_gid[0] + header->c_gid[1] * 256;
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st->st_nlink = header->c_nlink[0] + header->c_nlink[1] * 256;
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st->st_rdev = header->c_rdev[0] + header->c_rdev[1] * 256;
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st->st_mtime = le4(header->c_mtime);
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*namelength = header->c_namesize[0] + header->c_namesize[1] * 256;
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*name_pad = *namelength & 1; /* Pad to even. */
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a->entry_bytes_remaining = le4(header->c_filesize);
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st->st_size = a->entry_bytes_remaining;
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a->entry_padding = a->entry_bytes_remaining & 1; /* Pad to even. */
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return (ARCHIVE_OK);
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}
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static int
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header_bin_be(struct archive *a, struct stat *st,
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size_t *namelength, size_t *name_pad)
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{
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const void *h;
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const struct cpio_bin_header *header;
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size_t bytes;
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a->archive_format = ARCHIVE_FORMAT_CPIO;
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a->archive_format_name = "cpio (big-endian binary)";
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/* Read fixed-size portion of header. */
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bytes = (a->compression_read_ahead)(a, &h,
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sizeof(struct cpio_bin_header));
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if (bytes < sizeof(struct cpio_bin_header))
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return (ARCHIVE_FATAL);
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(a->compression_read_consume)(a, sizeof(struct cpio_bin_header));
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/* Parse out binary fields into struct stat. */
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header = h;
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st->st_dev = header->c_dev[0] * 256 + header->c_dev[1];
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st->st_ino = header->c_ino[0] * 256 + header->c_ino[1];
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st->st_mode = header->c_mode[0] * 256 + header->c_mode[1];
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st->st_uid = header->c_uid[0] * 256 + header->c_uid[1];
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st->st_gid = header->c_gid[0] * 256 + header->c_gid[1];
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st->st_nlink = header->c_nlink[0] * 256 + header->c_nlink[1];
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st->st_rdev = header->c_rdev[0] * 256 + header->c_rdev[1];
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st->st_mtime = be4(header->c_mtime);
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*namelength = header->c_namesize[0] * 256 + header->c_namesize[1];
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*name_pad = *namelength & 1; /* Pad to even. */
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a->entry_bytes_remaining = be4(header->c_filesize);
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st->st_size = a->entry_bytes_remaining;
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a->entry_padding = a->entry_bytes_remaining & 1; /* Pad to even. */
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return (ARCHIVE_OK);
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}
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static int
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archive_read_format_cpio_cleanup(struct archive *a)
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{
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struct cpio *cpio;
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cpio = *(a->pformat_data);
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/* Free inode->name map */
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while (cpio->links_head != NULL) {
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struct links_entry *lp = cpio->links_head->next;
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if (cpio->links_head->name)
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free(cpio->links_head->name);
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free(cpio->links_head);
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cpio->links_head = lp;
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}
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free(cpio);
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*(a->pformat_data) = NULL;
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return (ARCHIVE_OK);
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}
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static int
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le4(const unsigned char *p)
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{
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return ((p[0]<<16) + (p[1]<<24) + (p[2]<<0) + (p[3]<<8));
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}
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static int
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be4(const unsigned char *p)
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{
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return (p[0] + (p[1]<<8) + (p[2]<<16) + (p[3]<<24));
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}
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/*
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* Note that this implementation does not (and should not!) obey
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* locale settings; you cannot simply substitute strtol here, since
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* it does obey locale.
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*/
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static int64_t
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atol8(const char *p, unsigned char_cnt)
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{
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int64_t l;
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int digit;
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l = 0;
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while (char_cnt-- > 0) {
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if (*p >= '0' && *p <= '7')
|
|
digit = *p - '0';
|
|
else
|
|
return (l);
|
|
p++;
|
|
l <<= 3;
|
|
l |= digit;
|
|
}
|
|
return (l);
|
|
}
|
|
|
|
static int64_t
|
|
atol16(const char *p, unsigned char_cnt)
|
|
{
|
|
int64_t l;
|
|
int digit;
|
|
|
|
l = 0;
|
|
while (char_cnt-- > 0) {
|
|
if (*p >= 'a' && *p <= 'f')
|
|
digit = *p - 'a' + 10;
|
|
else if (*p >= 'A' && *p <= 'F')
|
|
digit = *p - 'A' + 10;
|
|
else if (*p >= '0' && *p <= '9')
|
|
digit = *p - '0';
|
|
else
|
|
return (l);
|
|
p++;
|
|
l <<= 4;
|
|
l |= digit;
|
|
}
|
|
return (l);
|
|
}
|
|
|
|
static void
|
|
record_hardlink(struct cpio *cpio, struct archive_entry *entry,
|
|
const struct stat *st)
|
|
{
|
|
struct links_entry *le;
|
|
|
|
/*
|
|
* First look in the list of multiply-linked files. If we've
|
|
* already dumped it, convert this entry to a hard link entry.
|
|
*/
|
|
for (le = cpio->links_head; le; le = le->next) {
|
|
if (le->dev == st->st_dev && le->ino == st->st_ino) {
|
|
archive_entry_set_hardlink(entry, le->name);
|
|
|
|
if (--le->links <= 0) {
|
|
if (le->previous != NULL)
|
|
le->previous->next = le->next;
|
|
if (le->next != NULL)
|
|
le->next->previous = le->previous;
|
|
if (cpio->links_head == le)
|
|
cpio->links_head = le->next;
|
|
free(le);
|
|
}
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
le = malloc(sizeof(struct links_entry));
|
|
if (cpio->links_head != NULL)
|
|
cpio->links_head->previous = le;
|
|
le->next = cpio->links_head;
|
|
le->previous = NULL;
|
|
cpio->links_head = le;
|
|
le->dev = st->st_dev;
|
|
le->ino = st->st_ino;
|
|
le->links = st->st_nlink - 1;
|
|
le->name = strdup(archive_entry_pathname(entry));
|
|
}
|