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freebsd-dev/lib/libarchive/archive_write_set_format_ustar.c
Tim Kientzle f81da3e584 libarchive 2.0 
* libarchive_test program exercises many of the core features
  * Refactored old "read_extract" into new "archive_write_disk", which
    uses archive_write methods to put entries onto disk.  In particular,
    you can now use archive_write_disk to create objects on disk
    without having an archive available.
  * Pushed some security checks from bsdtar down into libarchive, where
    they can be better optimized.
  * Rearchitected the logic for creating objects on disk to reduce
    the number of system calls.  Several common cases now use a
    minimum number of system calls.
  * Virtualized some internal interfaces to provide a clearer separation
    of read and write handling and make it simpler to override key
    methods.
  * New "empty" format reader.
  * Corrected return types (this ABI breakage required the "2.0" version bump)
  * Many bug fixes.
2007-03-03 07:37:37 +00:00

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/*-
* Copyright (c) 2003-2007 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.
* 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("$FreeBSD$");
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#else
#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif
#endif
#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_private.h"
#include "archive_write_private.h"
struct ustar {
uint64_t entry_bytes_remaining;
uint64_t entry_padding;
};
/*
* Define structure of POSIX 'ustar' tar header.
*/
#define USTAR_name_offset 0
#define USTAR_name_size 100
#define USTAR_mode_offset 100
#define USTAR_mode_size 6
#define USTAR_mode_max_size 8
#define USTAR_uid_offset 108
#define USTAR_uid_size 6
#define USTAR_uid_max_size 8
#define USTAR_gid_offset 116
#define USTAR_gid_size 6
#define USTAR_gid_max_size 8
#define USTAR_size_offset 124
#define USTAR_size_size 11
#define USTAR_size_max_size 12
#define USTAR_mtime_offset 136
#define USTAR_mtime_size 11
#define USTAR_mtime_max_size 11
#define USTAR_checksum_offset 148
#define USTAR_checksum_size 8
#define USTAR_typeflag_offset 156
#define USTAR_typeflag_size 1
#define USTAR_linkname_offset 157
#define USTAR_linkname_size 100
#define USTAR_magic_offset 257
#define USTAR_magic_size 6
#define USTAR_version_offset 263
#define USTAR_version_size 2
#define USTAR_uname_offset 265
#define USTAR_uname_size 32
#define USTAR_gname_offset 297
#define USTAR_gname_size 32
#define USTAR_rdevmajor_offset 329
#define USTAR_rdevmajor_size 6
#define USTAR_rdevmajor_max_size 8
#define USTAR_rdevminor_offset 337
#define USTAR_rdevminor_size 6
#define USTAR_rdevminor_max_size 8
#define USTAR_prefix_offset 345
#define USTAR_prefix_size 155
#define USTAR_padding_offset 500
#define USTAR_padding_size 12
/*
* A filled-in copy of the header for initialization.
*/
static const char template_header[] = {
/* name: 100 bytes */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,
/* Mode, space-null termination: 8 bytes */
'0','0','0','0','0','0', ' ','\0',
/* uid, space-null termination: 8 bytes */
'0','0','0','0','0','0', ' ','\0',
/* gid, space-null termination: 8 bytes */
'0','0','0','0','0','0', ' ','\0',
/* size, space termation: 12 bytes */
'0','0','0','0','0','0','0','0','0','0','0', ' ',
/* mtime, space termation: 12 bytes */
'0','0','0','0','0','0','0','0','0','0','0', ' ',
/* Initial checksum value: 8 spaces */
' ',' ',' ',' ',' ',' ',' ',' ',
/* Typeflag: 1 byte */
'0', /* '0' = regular file */
/* Linkname: 100 bytes */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,
/* Magic: 6 bytes, Version: 2 bytes */
'u','s','t','a','r','\0', '0','0',
/* Uname: 32 bytes */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
/* Gname: 32 bytes */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
/* rdevmajor + space/null padding: 8 bytes */
'0','0','0','0','0','0', ' ','\0',
/* rdevminor + space/null padding: 8 bytes */
'0','0','0','0','0','0', ' ','\0',
/* Prefix: 155 bytes */
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,
/* Padding: 12 bytes */
0,0,0,0,0,0,0,0, 0,0,0,0
};
static ssize_t archive_write_ustar_data(struct archive_write *a, const void *buff,
size_t s);
static int archive_write_ustar_destroy(struct archive_write *);
static int archive_write_ustar_finish(struct archive_write *);
static int archive_write_ustar_finish_entry(struct archive_write *);
static int archive_write_ustar_header(struct archive_write *,
struct archive_entry *entry);
static int format_256(int64_t, char *, int);
static int format_number(int64_t, char *, int size, int max, int strict);
static int format_octal(int64_t, char *, int);
static int write_nulls(struct archive_write *a, size_t);
/*
* Set output format to 'ustar' format.
*/
int
archive_write_set_format_ustar(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
struct ustar *ustar;
/* If someone else was already registered, unregister them. */
if (a->format_destroy != NULL)
(a->format_destroy)(a);
/* Basic internal sanity test. */
if (sizeof(template_header) != 512) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Internal: template_header wrong size: %d should be 512", sizeof(template_header));
return (ARCHIVE_FATAL);
}
ustar = (struct ustar *)malloc(sizeof(*ustar));
if (ustar == NULL) {
archive_set_error(&a->archive, ENOMEM, "Can't allocate ustar data");
return (ARCHIVE_FATAL);
}
memset(ustar, 0, sizeof(*ustar));
a->format_data = ustar;
a->pad_uncompressed = 1; /* Mimic gtar in this respect. */
a->format_write_header = archive_write_ustar_header;
a->format_write_data = archive_write_ustar_data;
a->format_finish = archive_write_ustar_finish;
a->format_destroy = archive_write_ustar_destroy;
a->format_finish_entry = archive_write_ustar_finish_entry;
a->archive_format = ARCHIVE_FORMAT_TAR_USTAR;
a->archive_format_name = "POSIX ustar";
return (ARCHIVE_OK);
}
static int
archive_write_ustar_header(struct archive_write *a, struct archive_entry *entry)
{
char buff[512];
int ret;
struct ustar *ustar;
ustar = (struct ustar *)a->format_data;
/* Only regular files (not hardlinks) have data. */
if (archive_entry_hardlink(entry) != NULL ||
archive_entry_symlink(entry) != NULL ||
!S_ISREG(archive_entry_mode(entry)))
archive_entry_set_size(entry, 0);
ret = __archive_write_format_header_ustar(a, buff, entry, -1, 1);
if (ret != ARCHIVE_OK)
return (ret);
ret = (a->compression_write)(a, buff, 512);
if (ret != ARCHIVE_OK)
return (ret);
ustar->entry_bytes_remaining = archive_entry_size(entry);
ustar->entry_padding = 0x1ff & (-(int64_t)ustar->entry_bytes_remaining);
return (ARCHIVE_OK);
}
/*
* Format a basic 512-byte "ustar" header.
*
* Returns -1 if format failed (due to field overflow).
* Note that this always formats as much of the header as possible.
* If "strict" is set to zero, it will extend numeric fields as
* necessary (overwriting terminators or using base-256 extensions).
*
* This is exported so that other 'tar' formats can use it.
*/
int
__archive_write_format_header_ustar(struct archive_write *a, char h[512],
struct archive_entry *entry, int tartype, int strict)
{
unsigned int checksum;
int i, ret;
size_t copy_length;
const char *p, *pp;
const struct stat *st;
int mytartype;
ret = 0;
mytartype = -1;
/*
* The "template header" already includes the "ustar"
* signature, various end-of-field markers and other required
* elements.
*/
memcpy(h, &template_header, 512);
/*
* Because the block is already null-filled, and strings
* are allowed to exactly fill their destination (without null),
* I use memcpy(dest, src, strlen()) here a lot to copy strings.
*/
pp = archive_entry_pathname(entry);
if (strlen(pp) <= USTAR_name_size)
memcpy(h + USTAR_name_offset, pp, strlen(pp));
else {
/* Store in two pieces, splitting at a '/'. */
p = strchr(pp + strlen(pp) - USTAR_name_size - 1, '/');
/*
* If there is no path separator, or the prefix or
* remaining name are too large, return an error.
*/
if (!p) {
archive_set_error(&a->archive, ENAMETOOLONG,
"Pathname too long");
ret = ARCHIVE_WARN;
} else if (p > pp + USTAR_prefix_size) {
archive_set_error(&a->archive, ENAMETOOLONG,
"Pathname too long");
ret = ARCHIVE_WARN;
} else {
/* Copy prefix and remainder to appropriate places */
memcpy(h + USTAR_prefix_offset, pp, p - pp);
memcpy(h + USTAR_name_offset, p + 1, pp + strlen(pp) - p - 1);
}
}
p = archive_entry_hardlink(entry);
if (p != NULL)
mytartype = '1';
else
p = archive_entry_symlink(entry);
if (p != NULL && p[0] != '\0') {
copy_length = strlen(p);
if (copy_length > USTAR_linkname_size) {
archive_set_error(&a->archive, ENAMETOOLONG,
"Link contents too long");
ret = ARCHIVE_WARN;
copy_length = USTAR_linkname_size;
}
memcpy(h + USTAR_linkname_offset, p, copy_length);
}
p = archive_entry_uname(entry);
if (p != NULL && p[0] != '\0') {
copy_length = strlen(p);
if (copy_length > USTAR_uname_size) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Username too long");
ret = ARCHIVE_WARN;
copy_length = USTAR_uname_size;
}
memcpy(h + USTAR_uname_offset, p, copy_length);
}
p = archive_entry_gname(entry);
if (p != NULL && p[0] != '\0') {
copy_length = strlen(p);
if (strlen(p) > USTAR_gname_size) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Group name too long");
ret = ARCHIVE_WARN;
copy_length = USTAR_gname_size;
}
memcpy(h + USTAR_gname_offset, p, copy_length);
}
st = archive_entry_stat(entry);
if (format_number(st->st_mode & 07777, h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) {
archive_set_error(&a->archive, ERANGE, "Numeric mode too large");
ret = ARCHIVE_WARN;
}
if (format_number(st->st_uid, h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) {
archive_set_error(&a->archive, ERANGE, "Numeric user ID too large");
ret = ARCHIVE_WARN;
}
if (format_number(st->st_gid, h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) {
archive_set_error(&a->archive, ERANGE, "Numeric group ID too large");
ret = ARCHIVE_WARN;
}
if (format_number(st->st_size, h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) {
archive_set_error(&a->archive, ERANGE, "File size out of range");
ret = ARCHIVE_WARN;
}
if (format_number(st->st_mtime, h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) {
archive_set_error(&a->archive, ERANGE,
"File modification time too large");
ret = ARCHIVE_WARN;
}
if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
if (format_number(major(st->st_rdev), h + USTAR_rdevmajor_offset,
USTAR_rdevmajor_size, USTAR_rdevmajor_max_size, strict)) {
archive_set_error(&a->archive, ERANGE,
"Major device number too large");
ret = ARCHIVE_WARN;
}
if (format_number(minor(st->st_rdev), h + USTAR_rdevminor_offset,
USTAR_rdevminor_size, USTAR_rdevminor_max_size, strict)) {
archive_set_error(&a->archive, ERANGE,
"Minor device number too large");
ret = ARCHIVE_WARN;
}
}
if (tartype >= 0) {
h[USTAR_typeflag_offset] = tartype;
} else if (mytartype >= 0) {
h[USTAR_typeflag_offset] = mytartype;
} else {
switch (st->st_mode & S_IFMT) {
case S_IFREG: h[USTAR_typeflag_offset] = '0' ; break;
case S_IFLNK: h[USTAR_typeflag_offset] = '2' ; break;
case S_IFCHR: h[USTAR_typeflag_offset] = '3' ; break;
case S_IFBLK: h[USTAR_typeflag_offset] = '4' ; break;
case S_IFDIR: h[USTAR_typeflag_offset] = '5' ; break;
case S_IFIFO: h[USTAR_typeflag_offset] = '6' ; break;
case S_IFSOCK:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"tar format cannot archive socket");
ret = ARCHIVE_WARN;
break;
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"tar format cannot archive this (mode=0%lo)",
(unsigned long)st->st_mode);
ret = ARCHIVE_WARN;
}
}
checksum = 0;
for (i = 0; i < 512; i++)
checksum += 255 & (unsigned int)h[i];
h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */
/* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */
format_octal(checksum, h + USTAR_checksum_offset, 6);
return (ret);
}
/*
* Format a number into a field, with some intelligence.
*/
static int
format_number(int64_t v, char *p, int s, int maxsize, int strict)
{
int64_t limit;
limit = ((int64_t)1 << (s*3));
/* "Strict" only permits octal values with proper termination. */
if (strict)
return (format_octal(v, p, s));
/*
* In non-strict mode, we allow the number to overwrite one or
* more bytes of the field termination. Even old tar
* implementations should be able to handle this with no
* problem.
*/
if (v >= 0) {
while (s <= maxsize) {
if (v < limit)
return (format_octal(v, p, s));
s++;
limit <<= 3;
}
}
/* Base-256 can handle any number, positive or negative. */
return (format_256(v, p, maxsize));
}
/*
* Format a number into the specified field using base-256.
*/
static int
format_256(int64_t v, char *p, int s)
{
p += s;
while (s-- > 0) {
*--p = (char)(v & 0xff);
v >>= 8;
}
*p |= 0x80; /* Set the base-256 marker bit. */
return (0);
}
/*
* Format a number into the specified field.
*/
static int
format_octal(int64_t v, char *p, int s)
{
int len;
len = s;
/* Octal values can't be negative, so use 0. */
if (v < 0) {
while (len-- > 0)
*p++ = '0';
return (-1);
}
p += s; /* Start at the end and work backwards. */
while (s-- > 0) {
*--p = (char)('0' + (v & 7));
v >>= 3;
}
if (v == 0)
return (0);
/* If it overflowed, fill field with max value. */
while (len-- > 0)
*p++ = '7';
return (-1);
}
static int
archive_write_ustar_finish(struct archive_write *a)
{
struct ustar *ustar;
int r;
if (a->compression_write == NULL)
return (ARCHIVE_OK);
ustar = (struct ustar *)a->format_data;
r = write_nulls(a, 512*2);
return (r);
}
static int
archive_write_ustar_destroy(struct archive_write *a)
{
struct ustar *ustar;
ustar = (struct ustar *)a->format_data;
free(ustar);
a->format_data = NULL;
return (ARCHIVE_OK);
}
static int
archive_write_ustar_finish_entry(struct archive_write *a)
{
struct ustar *ustar;
int ret;
ustar = (struct ustar *)a->format_data;
ret = write_nulls(a,
ustar->entry_bytes_remaining + ustar->entry_padding);
ustar->entry_bytes_remaining = ustar->entry_padding = 0;
return (ret);
}
static int
write_nulls(struct archive_write *a, size_t padding)
{
int ret, to_write;
while (padding > 0) {
to_write = padding < a->null_length ? padding : a->null_length;
ret = (a->compression_write)(a, a->nulls, to_write);
if (ret != ARCHIVE_OK)
return (ret);
padding -= to_write;
}
return (ARCHIVE_OK);
}
static ssize_t
archive_write_ustar_data(struct archive_write *a, const void *buff, size_t s)
{
struct ustar *ustar;
int ret;
ustar = (struct ustar *)a->format_data;
if (s > ustar->entry_bytes_remaining)
s = ustar->entry_bytes_remaining;
ret = (a->compression_write)(a, buff, s);
ustar->entry_bytes_remaining -= s;
if (ret != ARCHIVE_OK)
return (ret);
return (s);
}
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