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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* Copyright (c) 2011-2012 Michihiro NAKAJIMA
* 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(S) ``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(S) 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.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_cpio.c 201170 2009-12-29 06:34:23Z kientzle $");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_entry_locale.h"
#include "archive_private.h"
#include "archive_write_private.h"
static ssize_t archive_write_cpio_data(struct archive_write *,
const void *buff, size_t s);
static int archive_write_cpio_close(struct archive_write *);
static int archive_write_cpio_free(struct archive_write *);
static int archive_write_cpio_finish_entry(struct archive_write *);
static int archive_write_cpio_header(struct archive_write *,
struct archive_entry *);
static int archive_write_cpio_options(struct archive_write *,
const char *, const char *);
static int format_octal(int64_t, void *, int);
static int64_t format_octal_recursive(int64_t, char *, int);
static int write_header(struct archive_write *, struct archive_entry *);
struct cpio {
uint64_t entry_bytes_remaining;
int64_t ino_next;
struct { int64_t old; int new;} *ino_list;
size_t ino_list_size;
size_t ino_list_next;
struct archive_string_conv *opt_sconv;
struct archive_string_conv *sconv_default;
int init_default_conversion;
};
#define c_magic_offset 0
#define c_magic_size 6
#define c_dev_offset 6
#define c_dev_size 6
#define c_ino_offset 12
#define c_ino_size 6
#define c_mode_offset 18
#define c_mode_size 6
#define c_uid_offset 24
#define c_uid_size 6
#define c_gid_offset 30
#define c_gid_size 6
#define c_nlink_offset 36
#define c_nlink_size 6
#define c_rdev_offset 42
#define c_rdev_size 6
#define c_mtime_offset 48
#define c_mtime_size 11
#define c_namesize_offset 59
#define c_namesize_size 6
#define c_filesize_offset 65
#define c_filesize_size 11
/*
* Set output format to 'cpio' format.
*/
int
archive_write_set_format_cpio(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
struct cpio *cpio;
archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_format_cpio");
/* If someone else was already registered, unregister them. */
if (a->format_free != NULL)
(a->format_free)(a);
cpio = (struct cpio *)calloc(1, sizeof(*cpio));
if (cpio == NULL) {
archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data");
return (ARCHIVE_FATAL);
}
a->format_data = cpio;
a->format_name = "cpio";
a->format_options = archive_write_cpio_options;
a->format_write_header = archive_write_cpio_header;
a->format_write_data = archive_write_cpio_data;
a->format_finish_entry = archive_write_cpio_finish_entry;
a->format_close = archive_write_cpio_close;
a->format_free = archive_write_cpio_free;
a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
a->archive.archive_format_name = "POSIX cpio";
return (ARCHIVE_OK);
}
static int
archive_write_cpio_options(struct archive_write *a, const char *key,
const char *val)
{
struct cpio *cpio = (struct cpio *)a->format_data;
int ret = ARCHIVE_FAILED;
if (strcmp(key, "hdrcharset") == 0) {
if (val == NULL || val[0] == 0)
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"%s: hdrcharset option needs a character-set name",
a->format_name);
else {
cpio->opt_sconv = archive_string_conversion_to_charset(
&a->archive, val, 0);
if (cpio->opt_sconv != NULL)
ret = ARCHIVE_OK;
else
ret = ARCHIVE_FATAL;
}
return (ret);
}
/* Note: The "warn" return is just to inform the options
* supervisor that we didn't handle it. It will generate
* a suitable error if no one used this option. */
return (ARCHIVE_WARN);
}
/*
* Ino values are as long as 64 bits on some systems; cpio format
* only allows 18 bits and relies on the ino values to identify hardlinked
* files. So, we can't merely "hash" the ino numbers since collisions
* would corrupt the archive. Instead, we generate synthetic ino values
* to store in the archive and maintain a map of original ino values to
* synthetic ones so we can preserve hardlink information.
*
* TODO: Make this more efficient. It's not as bad as it looks (most
* files don't have any hardlinks and we don't do any work here for those),
* but it wouldn't be hard to do better.
*
* TODO: Work with dev/ino pairs here instead of just ino values.
*/
static int
synthesize_ino_value(struct cpio *cpio, struct archive_entry *entry)
{
int64_t ino = archive_entry_ino64(entry);
int ino_new;
size_t i;
/*
* If no index number was given, don't assign one. In
* particular, this handles the end-of-archive marker
* correctly by giving it a zero index value. (This is also
* why we start our synthetic index numbers with one below.)
*/
if (ino == 0)
return (0);
/* Don't store a mapping if we don't need to. */
if (archive_entry_nlink(entry) < 2) {
return (int)(++cpio->ino_next);
}
/* Look up old ino; if we have it, this is a hardlink
* and we reuse the same value. */
for (i = 0; i < cpio->ino_list_next; ++i) {
if (cpio->ino_list[i].old == ino)
return (cpio->ino_list[i].new);
}
/* Assign a new index number. */
ino_new = (int)(++cpio->ino_next);
/* Ensure space for the new mapping. */
if (cpio->ino_list_size <= cpio->ino_list_next) {
size_t newsize = cpio->ino_list_size < 512
? 512 : cpio->ino_list_size * 2;
void *newlist = realloc(cpio->ino_list,
sizeof(cpio->ino_list[0]) * newsize);
if (newlist == NULL)
return (-1);
cpio->ino_list_size = newsize;
cpio->ino_list = newlist;
}
/* Record and return the new value. */
cpio->ino_list[cpio->ino_list_next].old = ino;
cpio->ino_list[cpio->ino_list_next].new = ino_new;
++cpio->ino_list_next;
return (ino_new);
}
static struct archive_string_conv *
get_sconv(struct archive_write *a)
{
struct cpio *cpio;
struct archive_string_conv *sconv;
cpio = (struct cpio *)a->format_data;
sconv = cpio->opt_sconv;
if (sconv == NULL) {
if (!cpio->init_default_conversion) {
cpio->sconv_default =
archive_string_default_conversion_for_write(
&(a->archive));
cpio->init_default_conversion = 1;
}
sconv = cpio->sconv_default;
}
return (sconv);
}
static int
archive_write_cpio_header(struct archive_write *a, struct archive_entry *entry)
{
const char *path;
size_t len;
if (archive_entry_filetype(entry) == 0) {
archive_set_error(&a->archive, -1, "Filetype required");
return (ARCHIVE_FAILED);
}
if (archive_entry_pathname_l(entry, &path, &len, get_sconv(a)) != 0
&& errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Pathname");
return (ARCHIVE_FATAL);
}
if (len == 0 || path == NULL || path[0] == '\0') {
archive_set_error(&a->archive, -1, "Pathname required");
return (ARCHIVE_FAILED);
}
if (!archive_entry_size_is_set(entry) || archive_entry_size(entry) < 0) {
archive_set_error(&a->archive, -1, "Size required");
return (ARCHIVE_FAILED);
}
return write_header(a, entry);
}
static int
write_header(struct archive_write *a, struct archive_entry *entry)
{
struct cpio *cpio;
const char *p, *path;
int pathlength, ret, ret_final;
int64_t ino;
char h[76];
struct archive_string_conv *sconv;
struct archive_entry *entry_main;
size_t len;
cpio = (struct cpio *)a->format_data;
ret_final = ARCHIVE_OK;
sconv = get_sconv(a);
#if defined(_WIN32) && !defined(__CYGWIN__)
/* Make sure the path separators in pahtname, hardlink and symlink
* are all slash '/', not the Windows path separator '\'. */
entry_main = __la_win_entry_in_posix_pathseparator(entry);
if (entry_main == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate ustar data");
return(ARCHIVE_FATAL);
}
if (entry != entry_main)
entry = entry_main;
else
entry_main = NULL;
#else
entry_main = NULL;
#endif
ret = archive_entry_pathname_l(entry, &path, &len, sconv);
if (ret != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Pathname");
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
}
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate pathname '%s' to %s",
archive_entry_pathname(entry),
archive_string_conversion_charset_name(sconv));
ret_final = ARCHIVE_WARN;
}
/* Include trailing null. */
pathlength = (int)len + 1;
memset(h, 0, sizeof(h));
format_octal(070707, h + c_magic_offset, c_magic_size);
format_octal(archive_entry_dev(entry), h + c_dev_offset, c_dev_size);
ino = synthesize_ino_value(cpio, entry);
if (ino < 0) {
archive_set_error(&a->archive, ENOMEM,
"No memory for ino translation table");
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
} else if (ino > 0777777) {
archive_set_error(&a->archive, ERANGE,
"Too many files for this cpio format");
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
}
format_octal(ino & 0777777, h + c_ino_offset, c_ino_size);
/* TODO: Set ret_final to ARCHIVE_WARN if any of these overflow. */
format_octal(archive_entry_mode(entry), h + c_mode_offset, c_mode_size);
format_octal(archive_entry_uid(entry), h + c_uid_offset, c_uid_size);
format_octal(archive_entry_gid(entry), h + c_gid_offset, c_gid_size);
format_octal(archive_entry_nlink(entry), h + c_nlink_offset, c_nlink_size);
if (archive_entry_filetype(entry) == AE_IFBLK
|| archive_entry_filetype(entry) == AE_IFCHR)
format_octal(archive_entry_dev(entry), h + c_rdev_offset, c_rdev_size);
else
format_octal(0, h + c_rdev_offset, c_rdev_size);
format_octal(archive_entry_mtime(entry), h + c_mtime_offset, c_mtime_size);
format_octal(pathlength, h + c_namesize_offset, c_namesize_size);
/* Non-regular files don't store bodies. */
if (archive_entry_filetype(entry) != AE_IFREG)
archive_entry_set_size(entry, 0);
/* Symlinks get the link written as the body of the entry. */
ret = archive_entry_symlink_l(entry, &p, &len, sconv);
if (ret != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Linkname");
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
}
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate linkname '%s' to %s",
archive_entry_symlink(entry),
archive_string_conversion_charset_name(sconv));
ret_final = ARCHIVE_WARN;
}
if (len > 0 && p != NULL && *p != '\0')
ret = format_octal(strlen(p), h + c_filesize_offset,
c_filesize_size);
else
ret = format_octal(archive_entry_size(entry),
h + c_filesize_offset, c_filesize_size);
if (ret) {
archive_set_error(&a->archive, ERANGE,
"File is too large for cpio format.");
ret_final = ARCHIVE_FAILED;
goto exit_write_header;
}
ret = __archive_write_output(a, h, sizeof(h));
if (ret != ARCHIVE_OK) {
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
}
ret = __archive_write_output(a, path, pathlength);
if (ret != ARCHIVE_OK) {
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
}
cpio->entry_bytes_remaining = archive_entry_size(entry);
/* Write the symlink now. */
if (p != NULL && *p != '\0') {
ret = __archive_write_output(a, p, strlen(p));
if (ret != ARCHIVE_OK) {
ret_final = ARCHIVE_FATAL;
goto exit_write_header;
}
}
exit_write_header:
if (entry_main)
archive_entry_free(entry_main);
return (ret_final);
}
static ssize_t
archive_write_cpio_data(struct archive_write *a, const void *buff, size_t s)
{
struct cpio *cpio;
int ret;
cpio = (struct cpio *)a->format_data;
if (s > cpio->entry_bytes_remaining)
s = (size_t)cpio->entry_bytes_remaining;
ret = __archive_write_output(a, buff, s);
cpio->entry_bytes_remaining -= s;
if (ret >= 0)
return (s);
else
return (ret);
}
/*
* Format a number into the specified field.
*/
static int
format_octal(int64_t v, void *p, int digits)
{
int64_t max;
int ret;
max = (((int64_t)1) << (digits * 3)) - 1;
if (v >= 0 && v <= max) {
format_octal_recursive(v, (char *)p, digits);
ret = 0;
} else {
format_octal_recursive(max, (char *)p, digits);
ret = -1;
}
return (ret);
}
static int64_t
format_octal_recursive(int64_t v, char *p, int s)
{
if (s == 0)
return (v);
v = format_octal_recursive(v, p+1, s-1);
*p = '0' + ((char)v & 7);
return (v >> 3);
}
static int
archive_write_cpio_close(struct archive_write *a)
{
int er;
struct archive_entry *trailer;
trailer = archive_entry_new2(NULL);
/* nlink = 1 here for GNU cpio compat. */
archive_entry_set_nlink(trailer, 1);
archive_entry_set_size(trailer, 0);
archive_entry_set_pathname(trailer, "TRAILER!!!");
er = write_header(a, trailer);
archive_entry_free(trailer);
return (er);
}
static int
archive_write_cpio_free(struct archive_write *a)
{
struct cpio *cpio;
cpio = (struct cpio *)a->format_data;
free(cpio->ino_list);
free(cpio);
a->format_data = NULL;
return (ARCHIVE_OK);
}
static int
archive_write_cpio_finish_entry(struct archive_write *a)
{
struct cpio *cpio;
cpio = (struct cpio *)a->format_data;
return (__archive_write_nulls(a,
(size_t)cpio->entry_bytes_remaining));
}
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