freebsd-skq/lib/libarchive/archive_write_set_format_cpio.c
Tim Kientzle 8aaa8fe733 Add a lot of error checks, based on the patches provided by Dan Lukes.
Also fixes a memory leak reported by Andrew Turner.

PR: bin/83476
Thanks to: Dan Lukes, Andrew Turner
2005-09-21 04:25:06 +00:00

247 lines
6.7 KiB
C

/*-
* Copyright (c) 2003-2004 Tim Kientzle
* 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
* in this position and unchanged.
* 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("$FreeBSD$");
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
static int archive_write_cpio_data(struct archive *, const void *buff,
size_t s);
static int archive_write_cpio_finish(struct archive *);
static int archive_write_cpio_finish_entry(struct archive *);
static int archive_write_cpio_header(struct archive *,
struct archive_entry *);
static int format_octal(int64_t, void *, int);
static int64_t format_octal_recursive(int64_t, char *, int);
struct cpio {
uint64_t entry_bytes_remaining;
};
struct cpio_header {
char c_magic[6];
char c_dev[6];
char c_ino[6];
char c_mode[6];
char c_uid[6];
char c_gid[6];
char c_nlink[6];
char c_rdev[6];
char c_mtime[11];
char c_namesize[6];
char c_filesize[11];
};
/*
* Set output format to 'cpio' format.
*/
int
archive_write_set_format_cpio(struct archive *a)
{
struct cpio *cpio;
/* If someone else was already registered, unregister them. */
if (a->format_finish != NULL)
(a->format_finish)(a);
cpio = malloc(sizeof(*cpio));
if (cpio == NULL) {
archive_set_error(a, ENOMEM, "Can't allocate cpio data");
return (ARCHIVE_FATAL);
}
memset(cpio, 0, sizeof(*cpio));
a->format_data = cpio;
a->pad_uncompressed = 1;
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_finish = archive_write_cpio_finish;
a->archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
a->archive_format_name = "POSIX cpio";
return (ARCHIVE_OK);
}
static int
archive_write_cpio_header(struct archive *a, struct archive_entry *entry)
{
struct cpio *cpio;
const char *p, *path;
int pathlength, ret;
const struct stat *st;
struct cpio_header h;
cpio = a->format_data;
ret = 0;
path = archive_entry_pathname(entry);
pathlength = strlen(path) + 1; /* Include trailing null. */
st = archive_entry_stat(entry);
memset(&h, 0, sizeof(h));
format_octal(070707, &h.c_magic, sizeof(h.c_magic));
format_octal(st->st_dev, &h.c_dev, sizeof(h.c_dev));
/*
* TODO: Generate artificial inode numbers rather than just
* re-using the ones off the disk. That way, the 18-bit c_ino
* field only limits the number of files in the archive.
*/
if (st->st_ino > 0777777) {
archive_set_error(a, ERANGE, "large inode number truncated");
ret = ARCHIVE_WARN;
}
format_octal(st->st_ino & 0777777, &h.c_ino, sizeof(h.c_ino));
format_octal(st->st_mode, &h.c_mode, sizeof(h.c_mode));
format_octal(st->st_uid, &h.c_uid, sizeof(h.c_uid));
format_octal(st->st_gid, &h.c_gid, sizeof(h.c_gid));
format_octal(st->st_nlink, &h.c_nlink, sizeof(h.c_nlink));
if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode))
format_octal(st->st_rdev, &h.c_rdev, sizeof(h.c_rdev));
else
format_octal(0, &h.c_rdev, sizeof(h.c_rdev));
format_octal(st->st_mtime, &h.c_mtime, sizeof(h.c_mtime));
format_octal(pathlength, &h.c_namesize, sizeof(h.c_namesize));
/* Symlinks get the link written as the body of the entry. */
p = archive_entry_symlink(entry);
if (p != NULL && *p != '\0')
format_octal(strlen(p), &h.c_filesize, sizeof(h.c_filesize));
else
format_octal(st->st_size, &h.c_filesize, sizeof(h.c_filesize));
ret = (a->compression_write)(a, &h, sizeof(h));
if (ret != ARCHIVE_OK)
return (ARCHIVE_FATAL);
ret = (a->compression_write)(a, path, pathlength);
if (ret != ARCHIVE_OK)
return (ARCHIVE_FATAL);
cpio->entry_bytes_remaining = st->st_size;
/* Write the symlink now. */
if (p != NULL && *p != '\0')
ret = (a->compression_write)(a, p, strlen(p));
return (ret);
}
static int
archive_write_cpio_data(struct archive *a, const void *buff, size_t s)
{
struct cpio *cpio;
int ret;
cpio = a->format_data;
if (s > cpio->entry_bytes_remaining)
s = cpio->entry_bytes_remaining;
ret = (a->compression_write)(a, buff, s);
cpio->entry_bytes_remaining -= s;
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, p, digits);
ret = 0;
} else {
format_octal_recursive(max, 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' + (v & 7);
return (v >>= 3);
}
static int
archive_write_cpio_finish(struct archive *a)
{
struct cpio *cpio;
struct stat st;
int er;
struct archive_entry *trailer;
cpio = a->format_data;
trailer = archive_entry_new();
memset(&st, 0, sizeof(st));
st.st_nlink = 1;
archive_entry_copy_stat(trailer, &st);
archive_entry_set_pathname(trailer, "TRAILER!!!");
er = archive_write_cpio_header(a, trailer);
archive_entry_free(trailer);
free(cpio);
a->format_data = NULL;
return (er);
}
static int
archive_write_cpio_finish_entry(struct archive *a)
{
struct cpio *cpio;
int to_write, ret;
cpio = a->format_data;
ret = ARCHIVE_OK;
while (cpio->entry_bytes_remaining > 0) {
to_write = cpio->entry_bytes_remaining < a->null_length ?
cpio->entry_bytes_remaining : a->null_length;
ret = (a->compression_write)(a, a->nulls, to_write);
if (ret != ARCHIVE_OK)
return (ret);
cpio->entry_bytes_remaining -= to_write;
}
return (ret);
}