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CMake/Utilities/cmlibarchive/libarchive/archive_write_set_format_pax.c

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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* Copyright (c) 2010-2012 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_pax.c 201162 2009-12-29 05:47:46Z kientzle $");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#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"
struct sparse_block {
struct sparse_block *next;
int is_hole;
uint64_t offset;
uint64_t remaining;
};
struct pax {
uint64_t entry_bytes_remaining;
uint64_t entry_padding;
struct archive_string l_url_encoded_name;
struct archive_string pax_header;
struct archive_string sparse_map;
size_t sparse_map_padding;
struct sparse_block *sparse_list;
struct sparse_block *sparse_tail;
struct archive_string_conv *sconv_utf8;
int opt_binary;
};
static void add_pax_attr(struct archive_string *, const char *key,
const char *value);
static void add_pax_attr_int(struct archive_string *,
const char *key, int64_t value);
static void add_pax_attr_time(struct archive_string *,
const char *key, int64_t sec,
unsigned long nanos);
static ssize_t archive_write_pax_data(struct archive_write *,
const void *, size_t);
static int archive_write_pax_close(struct archive_write *);
static int archive_write_pax_free(struct archive_write *);
static int archive_write_pax_finish_entry(struct archive_write *);
static int archive_write_pax_header(struct archive_write *,
struct archive_entry *);
static int archive_write_pax_options(struct archive_write *,
const char *, const char *);
static char *base64_encode(const char *src, size_t len);
static char *build_gnu_sparse_name(char *dest, const char *src);
static char *build_pax_attribute_name(char *dest, const char *src);
static char *build_ustar_entry_name(char *dest, const char *src,
size_t src_length, const char *insert);
static char *format_int(char *dest, int64_t);
static int has_non_ASCII(const char *);
static void sparse_list_clear(struct pax *);
static int sparse_list_add(struct pax *, int64_t, int64_t);
static char *url_encode(const char *in);
/*
* Set output format to 'restricted pax' format.
*
* This is the same as normal 'pax', but tries to suppress
* the pax header whenever possible. This is the default for
* bsdtar, for instance.
*/
int
archive_write_set_format_pax_restricted(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
int r;
archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_format_pax_restricted");
r = archive_write_set_format_pax(&a->archive);
a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
a->archive.archive_format_name = "restricted POSIX pax interchange";
return (r);
}
/*
* Set output format to 'pax' format.
*/
int
archive_write_set_format_pax(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
struct pax *pax;
archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_format_pax");
if (a->format_free != NULL)
(a->format_free)(a);
pax = (struct pax *)malloc(sizeof(*pax));
if (pax == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate pax data");
return (ARCHIVE_FATAL);
}
memset(pax, 0, sizeof(*pax));
a->format_data = pax;
a->format_name = "pax";
a->format_options = archive_write_pax_options;
a->format_write_header = archive_write_pax_header;
a->format_write_data = archive_write_pax_data;
a->format_close = archive_write_pax_close;
a->format_free = archive_write_pax_free;
a->format_finish_entry = archive_write_pax_finish_entry;
a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE;
a->archive.archive_format_name = "POSIX pax interchange";
return (ARCHIVE_OK);
}
static int
archive_write_pax_options(struct archive_write *a, const char *key,
const char *val)
{
struct pax *pax = (struct pax *)a->format_data;
int ret = ARCHIVE_FAILED;
if (strcmp(key, "hdrcharset") == 0) {
/*
* The character-set we can use are defined in
* IEEE Std 1003.1-2001
*/
if (val == NULL || val[0] == 0)
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"pax: hdrcharset option needs a character-set name");
else if (strcmp(val, "BINARY") == 0 ||
strcmp(val, "binary") == 0) {
/*
* Specify binary mode. We will not convert
* filenames, uname and gname to any charsets.
*/
pax->opt_binary = 1;
ret = ARCHIVE_OK;
} else if (strcmp(val, "UTF-8") == 0) {
/*
* Specify UTF-8 character-set to be used for
* filenames. This is almost the test that
* running platform supports the string conversion.
* Especially libarchive_test needs this trick for
* its test.
*/
pax->sconv_utf8 = archive_string_conversion_to_charset(
&(a->archive), "UTF-8", 0);
if (pax->sconv_utf8 == NULL)
ret = ARCHIVE_FATAL;
else
ret = ARCHIVE_OK;
} else
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"pax: invalid charset name");
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);
}
/*
* Note: This code assumes that 'nanos' has the same sign as 'sec',
* which implies that sec=-1, nanos=200000000 represents -1.2 seconds
* and not -0.8 seconds. This is a pretty pedantic point, as we're
* unlikely to encounter many real files created before Jan 1, 1970,
* much less ones with timestamps recorded to sub-second resolution.
*/
static void
add_pax_attr_time(struct archive_string *as, const char *key,
int64_t sec, unsigned long nanos)
{
int digit, i;
char *t;
/*
* Note that each byte contributes fewer than 3 base-10
* digits, so this will always be big enough.
*/
char tmp[1 + 3*sizeof(sec) + 1 + 3*sizeof(nanos)];
tmp[sizeof(tmp) - 1] = 0;
t = tmp + sizeof(tmp) - 1;
/* Skip trailing zeros in the fractional part. */
for (digit = 0, i = 10; i > 0 && digit == 0; i--) {
digit = nanos % 10;
nanos /= 10;
}
/* Only format the fraction if it's non-zero. */
if (i > 0) {
while (i > 0) {
*--t = "0123456789"[digit];
digit = nanos % 10;
nanos /= 10;
i--;
}
*--t = '.';
}
t = format_int(t, sec);
add_pax_attr(as, key, t);
}
static char *
format_int(char *t, int64_t i)
{
uint64_t ui;
if (i < 0)
ui = (i == INT64_MIN) ? (uint64_t)(INT64_MAX) + 1 : (uint64_t)(-i);
else
ui = i;
do {
*--t = "0123456789"[ui % 10];
} while (ui /= 10);
if (i < 0)
*--t = '-';
return (t);
}
static void
add_pax_attr_int(struct archive_string *as, const char *key, int64_t value)
{
char tmp[1 + 3 * sizeof(value)];
tmp[sizeof(tmp) - 1] = 0;
add_pax_attr(as, key, format_int(tmp + sizeof(tmp) - 1, value));
}
/*
* Add a key/value attribute to the pax header. This function handles
* the length field and various other syntactic requirements.
*/
static void
add_pax_attr(struct archive_string *as, const char *key, const char *value)
{
int digits, i, len, next_ten;
char tmp[1 + 3 * sizeof(int)]; /* < 3 base-10 digits per byte */
/*-
* PAX attributes have the following layout:
* <len> <space> <key> <=> <value> <nl>
*/
len = 1 + (int)strlen(key) + 1 + (int)strlen(value) + 1;
/*
* The <len> field includes the length of the <len> field, so
* computing the correct length is tricky. I start by
* counting the number of base-10 digits in 'len' and
* computing the next higher power of 10.
*/
next_ten = 1;
digits = 0;
i = len;
while (i > 0) {
i = i / 10;
digits++;
next_ten = next_ten * 10;
}
/*
* For example, if string without the length field is 99
* chars, then adding the 2 digit length "99" will force the
* total length past 100, requiring an extra digit. The next
* statement adjusts for this effect.
*/
if (len + digits >= next_ten)
digits++;
/* Now, we have the right length so we can build the line. */
tmp[sizeof(tmp) - 1] = 0; /* Null-terminate the work area. */
archive_strcat(as, format_int(tmp + sizeof(tmp) - 1, len + digits));
archive_strappend_char(as, ' ');
archive_strcat(as, key);
archive_strappend_char(as, '=');
archive_strcat(as, value);
archive_strappend_char(as, '\n');
}
static int
archive_write_pax_header_xattrs(struct archive_write *a,
struct pax *pax, struct archive_entry *entry)
{
struct archive_string s;
int i = archive_entry_xattr_reset(entry);
while (i--) {
const char *name;
const void *value;
char *encoded_value;
char *url_encoded_name = NULL, *encoded_name = NULL;
size_t size;
int r;
archive_entry_xattr_next(entry, &name, &value, &size);
url_encoded_name = url_encode(name);
if (url_encoded_name != NULL) {
/* Convert narrow-character to UTF-8. */
r = archive_strcpy_l(&(pax->l_url_encoded_name),
url_encoded_name, pax->sconv_utf8);
free(url_encoded_name); /* Done with this. */
if (r == 0)
encoded_name = pax->l_url_encoded_name.s;
else if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Linkname");
return (ARCHIVE_FATAL);
}
}
encoded_value = base64_encode((const char *)value, size);
if (encoded_name != NULL && encoded_value != NULL) {
archive_string_init(&s);
archive_strcpy(&s, "LIBARCHIVE.xattr.");
archive_strcat(&s, encoded_name);
add_pax_attr(&(pax->pax_header), s.s, encoded_value);
archive_string_free(&s);
}
free(encoded_value);
}
return (ARCHIVE_OK);
}
static int
get_entry_hardlink(struct archive_write *a, struct archive_entry *entry,
const char **name, size_t *length, struct archive_string_conv *sc)
{
int r;
r = archive_entry_hardlink_l(entry, name, length, sc);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Linkname");
return (ARCHIVE_FATAL);
}
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
static int
get_entry_pathname(struct archive_write *a, struct archive_entry *entry,
const char **name, size_t *length, struct archive_string_conv *sc)
{
int r;
r = archive_entry_pathname_l(entry, name, length, sc);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Pathname");
return (ARCHIVE_FATAL);
}
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
static int
get_entry_uname(struct archive_write *a, struct archive_entry *entry,
const char **name, size_t *length, struct archive_string_conv *sc)
{
int r;
r = archive_entry_uname_l(entry, name, length, sc);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Uname");
return (ARCHIVE_FATAL);
}
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
static int
get_entry_gname(struct archive_write *a, struct archive_entry *entry,
const char **name, size_t *length, struct archive_string_conv *sc)
{
int r;
r = archive_entry_gname_l(entry, name, length, sc);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Gname");
return (ARCHIVE_FATAL);
}
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
static int
get_entry_symlink(struct archive_write *a, struct archive_entry *entry,
const char **name, size_t *length, struct archive_string_conv *sc)
{
int r;
r = archive_entry_symlink_l(entry, name, length, sc);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for Linkname");
return (ARCHIVE_FATAL);
}
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
/*
* TODO: Consider adding 'comment' and 'charset' fields to
* archive_entry so that clients can specify them. Also, consider
* adding generic key/value tags so clients can add arbitrary
* key/value data.
*
* TODO: Break up this 700-line function!!!! Yowza!
*/
static int
archive_write_pax_header(struct archive_write *a,
struct archive_entry *entry_original)
{
struct archive_entry *entry_main;
const char *p;
const char *suffix;
int need_extension, r, ret;
int sparse_count;
uint64_t sparse_total, real_size;
struct pax *pax;
const char *hardlink;
const char *path = NULL, *linkpath = NULL;
const char *uname = NULL, *gname = NULL;
const void *mac_metadata;
size_t mac_metadata_size;
struct archive_string_conv *sconv;
size_t hardlink_length, path_length, linkpath_length;
size_t uname_length, gname_length;
char paxbuff[512];
char ustarbuff[512];
char ustar_entry_name[256];
char pax_entry_name[256];
char gnu_sparse_name[256];
struct archive_string entry_name;
ret = ARCHIVE_OK;
need_extension = 0;
pax = (struct pax *)a->format_data;
/* Sanity check. */
if (archive_entry_pathname(entry_original) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Can't record entry in tar file without pathname");
return (ARCHIVE_FAILED);
}
/*
* Choose a header encoding.
*/
if (pax->opt_binary)
sconv = NULL;/* Binary mode. */
else {
/* Header encoding is UTF-8. */
if (pax->sconv_utf8 == NULL) {
/* Initialize the string conversion object
* we must need */
pax->sconv_utf8 = archive_string_conversion_to_charset(
&(a->archive), "UTF-8", 1);
if (pax->sconv_utf8 == NULL)
/* Couldn't allocate memory */
return (ARCHIVE_FAILED);
}
sconv = pax->sconv_utf8;
}
r = get_entry_hardlink(a, entry_original, &hardlink,
&hardlink_length, sconv);
if (r == ARCHIVE_FATAL)
return (r);
else if (r != ARCHIVE_OK) {
r = get_entry_hardlink(a, entry_original, &hardlink,
&hardlink_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate linkname '%s' to %s", hardlink,
archive_string_conversion_charset_name(sconv));
ret = ARCHIVE_WARN;
sconv = NULL;/* The header charset switches to binary mode. */
}
/* Make sure this is a type of entry that we can handle here */
if (hardlink == NULL) {
switch (archive_entry_filetype(entry_original)) {
case AE_IFBLK:
case AE_IFCHR:
case AE_IFIFO:
case AE_IFLNK:
case AE_IFREG:
break;
case AE_IFDIR:
{
/*
* Ensure a trailing '/'. Modify the original
* entry so the client sees the change.
*/
#if defined(_WIN32) && !defined(__CYGWIN__)
const wchar_t *wp;
wp = archive_entry_pathname_w(entry_original);
if (wp != NULL && wp[wcslen(wp) -1] != L'/') {
struct archive_wstring ws;
archive_string_init(&ws);
path_length = wcslen(wp);
if (archive_wstring_ensure(&ws,
path_length + 2) == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate pax data");
archive_wstring_free(&ws);
return(ARCHIVE_FATAL);
}
/* Should we keep '\' ? */
if (wp[path_length -1] == L'\\')
path_length--;
archive_wstrncpy(&ws, wp, path_length);
archive_wstrappend_wchar(&ws, L'/');
archive_entry_copy_pathname_w(
entry_original, ws.s);
archive_wstring_free(&ws);
p = NULL;
} else
#endif
p = archive_entry_pathname(entry_original);
/*
* On Windows, this is a backup operation just in
* case getting WCS failed. On POSIX, this is a
* normal operation.
*/
if (p != NULL && p[strlen(p) - 1] != '/') {
struct archive_string as;
archive_string_init(&as);
path_length = strlen(p);
if (archive_string_ensure(&as,
path_length + 2) == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate pax data");
archive_string_free(&as);
return(ARCHIVE_FATAL);
}
#if defined(_WIN32) && !defined(__CYGWIN__)
/* NOTE: This might break the pathname
* if the current code page is CP932 and
* the pathname includes a character '\'
* as a part of its multibyte pathname. */
if (p[strlen(p) -1] == '\\')
path_length--;
else
#endif
archive_strncpy(&as, p, path_length);
archive_strappend_char(&as, '/');
archive_entry_copy_pathname(
entry_original, as.s);
archive_string_free(&as);
}
break;
}
case AE_IFSOCK:
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"tar format cannot archive socket");
return (ARCHIVE_FAILED);
default:
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"tar format cannot archive this (type=0%lo)",
(unsigned long)
archive_entry_filetype(entry_original));
return (ARCHIVE_FAILED);
}
}
/*
* If Mac OS metadata blob is here, recurse to write that
* as a separate entry. This is really a pretty poor design:
* In particular, it doubles the overhead for long filenames.
* TODO: Help Apple folks design something better and figure
* out how to transition from this legacy format.
*
* Note that this code is present on every platform; clients
* on non-Mac are unlikely to ever provide this data, but
* applications that copy entries from one archive to another
* should not lose data just because the local filesystem
* can't store it.
*/
mac_metadata =
archive_entry_mac_metadata(entry_original, &mac_metadata_size);
if (mac_metadata != NULL) {
const char *oname;
char *name, *bname;
size_t name_length;
struct archive_entry *extra = archive_entry_new2(&a->archive);
oname = archive_entry_pathname(entry_original);
name_length = strlen(oname);
name = malloc(name_length + 3);
if (name == NULL || extra == NULL) {
/* XXX error message */
archive_entry_free(extra);
free(name);
return (ARCHIVE_FAILED);
}
strcpy(name, oname);
/* Find last '/'; strip trailing '/' characters */
bname = strrchr(name, '/');
while (bname != NULL && bname[1] == '\0') {
*bname = '\0';
bname = strrchr(name, '/');
}
if (bname == NULL) {
memmove(name + 2, name, name_length + 1);
memmove(name, "._", 2);
} else {
bname += 1;
memmove(bname + 2, bname, strlen(bname) + 1);
memmove(bname, "._", 2);
}
archive_entry_copy_pathname(extra, name);
free(name);
archive_entry_set_size(extra, mac_metadata_size);
archive_entry_set_filetype(extra, AE_IFREG);
archive_entry_set_perm(extra,
archive_entry_perm(entry_original));
archive_entry_set_mtime(extra,
archive_entry_mtime(entry_original),
archive_entry_mtime_nsec(entry_original));
archive_entry_set_gid(extra,
archive_entry_gid(entry_original));
archive_entry_set_gname(extra,
archive_entry_gname(entry_original));
archive_entry_set_uid(extra,
archive_entry_uid(entry_original));
archive_entry_set_uname(extra,
archive_entry_uname(entry_original));
/* Recurse to write the special copyfile entry. */
r = archive_write_pax_header(a, extra);
archive_entry_free(extra);
if (r < ARCHIVE_WARN)
return (r);
if (r < ret)
ret = r;
r = (int)archive_write_pax_data(a, mac_metadata,
mac_metadata_size);
if (r < ARCHIVE_WARN)
return (r);
if (r < ret)
ret = r;
r = archive_write_pax_finish_entry(a);
if (r < ARCHIVE_WARN)
return (r);
if (r < ret)
ret = r;
}
/* Copy entry so we can modify it as needed. */
#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_original);
if (entry_main == entry_original)
entry_main = archive_entry_clone(entry_original);
#else
entry_main = archive_entry_clone(entry_original);
#endif
if (entry_main == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate pax data");
return(ARCHIVE_FATAL);
}
archive_string_empty(&(pax->pax_header)); /* Blank our work area. */
archive_string_empty(&(pax->sparse_map));
sparse_total = 0;
sparse_list_clear(pax);
if (hardlink == NULL &&
archive_entry_filetype(entry_main) == AE_IFREG)
sparse_count = archive_entry_sparse_reset(entry_main);
else
sparse_count = 0;
if (sparse_count) {
int64_t offset, length, last_offset = 0;
/* Get the last entry of sparse block. */
while (archive_entry_sparse_next(
entry_main, &offset, &length) == ARCHIVE_OK)
last_offset = offset + length;
/* If the last sparse block does not reach the end of file,
* We have to add a empty sparse block as the last entry to
* manage storing file data. */
if (last_offset < archive_entry_size(entry_main))
archive_entry_sparse_add_entry(entry_main,
archive_entry_size(entry_main), 0);
sparse_count = archive_entry_sparse_reset(entry_main);
}
/*
* First, check the name fields and see if any of them
* require binary coding. If any of them does, then all of
* them do.
*/
r = get_entry_pathname(a, entry_main, &path, &path_length, sconv);
if (r == ARCHIVE_FATAL)
return (r);
else if (r != ARCHIVE_OK) {
r = get_entry_pathname(a, entry_main, &path,
&path_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate pathname '%s' to %s", path,
archive_string_conversion_charset_name(sconv));
ret = ARCHIVE_WARN;
sconv = NULL;/* The header charset switches to binary mode. */
}
r = get_entry_uname(a, entry_main, &uname, &uname_length, sconv);
if (r == ARCHIVE_FATAL)
return (r);
else if (r != ARCHIVE_OK) {
r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate uname '%s' to %s", uname,
archive_string_conversion_charset_name(sconv));
ret = ARCHIVE_WARN;
sconv = NULL;/* The header charset switches to binary mode. */
}
r = get_entry_gname(a, entry_main, &gname, &gname_length, sconv);
if (r == ARCHIVE_FATAL)
return (r);
else if (r != ARCHIVE_OK) {
r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate gname '%s' to %s", gname,
archive_string_conversion_charset_name(sconv));
ret = ARCHIVE_WARN;
sconv = NULL;/* The header charset switches to binary mode. */
}
linkpath = hardlink;
linkpath_length = hardlink_length;
if (linkpath == NULL) {
r = get_entry_symlink(a, entry_main, &linkpath,
&linkpath_length, sconv);
if (r == ARCHIVE_FATAL)
return (r);
else if (r != ARCHIVE_OK) {
r = get_entry_symlink(a, entry_main, &linkpath,
&linkpath_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate linkname '%s' to %s", linkpath,
archive_string_conversion_charset_name(sconv));
ret = ARCHIVE_WARN;
sconv = NULL;
}
}
/* If any string conversions failed, get all attributes
* in binary-mode. */
if (sconv == NULL && !pax->opt_binary) {
if (hardlink != NULL) {
r = get_entry_hardlink(a, entry_main, &hardlink,
&hardlink_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
linkpath = hardlink;
linkpath_length = hardlink_length;
}
r = get_entry_pathname(a, entry_main, &path,
&path_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL);
if (r == ARCHIVE_FATAL)
return (r);
}
/* Store the header encoding first, to be nice to readers. */
if (sconv == NULL)
add_pax_attr(&(pax->pax_header), "hdrcharset", "BINARY");
/*
* If name is too long, or has non-ASCII characters, add
* 'path' to pax extended attrs. (Note that an unconvertible
* name must have non-ASCII characters.)
*/
if (has_non_ASCII(path)) {
/* We have non-ASCII characters. */
add_pax_attr(&(pax->pax_header), "path", path);
archive_entry_set_pathname(entry_main,
build_ustar_entry_name(ustar_entry_name,
path, path_length, NULL));
need_extension = 1;
} else {
/* We have an all-ASCII path; we'd like to just store
* it in the ustar header if it will fit. Yes, this
* duplicates some of the logic in
* archive_write_set_format_ustar.c
*/
if (path_length <= 100) {
/* Fits in the old 100-char tar name field. */
} else {
/* Find largest suffix that will fit. */
/* Note: strlen() > 100, so strlen() - 100 - 1 >= 0 */
suffix = strchr(path + path_length - 100 - 1, '/');
/* Don't attempt an empty prefix. */
if (suffix == path)
suffix = strchr(suffix + 1, '/');
/* We can put it in the ustar header if it's
* all ASCII and it's either <= 100 characters
* or can be split at a '/' into a prefix <=
* 155 chars and a suffix <= 100 chars. (Note
* the strchr() above will return NULL exactly
* when the path can't be split.)
*/
if (suffix == NULL /* Suffix > 100 chars. */
|| suffix[1] == '\0' /* empty suffix */
|| suffix - path > 155) /* Prefix > 155 chars */
{
add_pax_attr(&(pax->pax_header), "path", path);
archive_entry_set_pathname(entry_main,
build_ustar_entry_name(ustar_entry_name,
path, path_length, NULL));
need_extension = 1;
}
}
}
if (linkpath != NULL) {
/* If link name is too long or has non-ASCII characters, add
* 'linkpath' to pax extended attrs. */
if (linkpath_length > 100 || has_non_ASCII(linkpath)) {
add_pax_attr(&(pax->pax_header), "linkpath", linkpath);
if (linkpath_length > 100) {
if (hardlink != NULL)
archive_entry_set_hardlink(entry_main,
"././@LongHardLink");
else
archive_entry_set_symlink(entry_main,
"././@LongSymLink");
}
need_extension = 1;
}
}
/* Save a pathname since it will be renamed if `entry_main` has
* sparse blocks. */
archive_string_init(&entry_name);
archive_strcpy(&entry_name, archive_entry_pathname(entry_main));
/* If file size is too large, add 'size' to pax extended attrs. */
if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) {
add_pax_attr_int(&(pax->pax_header), "size",
archive_entry_size(entry_main));
need_extension = 1;
}
/* If numeric GID is too large, add 'gid' to pax extended attrs. */
if ((unsigned int)archive_entry_gid(entry_main) >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "gid",
archive_entry_gid(entry_main));
need_extension = 1;
}
/* If group name is too large or has non-ASCII characters, add
* 'gname' to pax extended attrs. */
if (gname != NULL) {
if (gname_length > 31 || has_non_ASCII(gname)) {
add_pax_attr(&(pax->pax_header), "gname", gname);
need_extension = 1;
}
}
/* If numeric UID is too large, add 'uid' to pax extended attrs. */
if ((unsigned int)archive_entry_uid(entry_main) >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "uid",
archive_entry_uid(entry_main));
need_extension = 1;
}
/* Add 'uname' to pax extended attrs if necessary. */
if (uname != NULL) {
if (uname_length > 31 || has_non_ASCII(uname)) {
add_pax_attr(&(pax->pax_header), "uname", uname);
need_extension = 1;
}
}
/*
* POSIX/SUSv3 doesn't provide a standard key for large device
* numbers. I use the same keys here that Joerg Schilling
* used for 'star.' (Which, somewhat confusingly, are called
* "devXXX" even though they code "rdev" values.) No doubt,
* other implementations use other keys. Note that there's no
* reason we can't write the same information into a number of
* different keys.
*
* Of course, this is only needed for block or char device entries.
*/
if (archive_entry_filetype(entry_main) == AE_IFBLK
|| archive_entry_filetype(entry_main) == AE_IFCHR) {
/*
* If rdevmajor is too large, add 'SCHILY.devmajor' to
* extended attributes.
*/
int rdevmajor, rdevminor;
rdevmajor = archive_entry_rdevmajor(entry_main);
rdevminor = archive_entry_rdevminor(entry_main);
if (rdevmajor >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "SCHILY.devmajor",
rdevmajor);
/*
* Non-strict formatting below means we don't
* have to truncate here. Not truncating improves
* the chance that some more modern tar archivers
* (such as GNU tar 1.13) can restore the full
* value even if they don't understand the pax
* extended attributes. See my rant below about
* file size fields for additional details.
*/
/* archive_entry_set_rdevmajor(entry_main,
rdevmajor & ((1 << 18) - 1)); */
need_extension = 1;
}
/*
* If devminor is too large, add 'SCHILY.devminor' to
* extended attributes.
*/
if (rdevminor >= (1 << 18)) {
add_pax_attr_int(&(pax->pax_header), "SCHILY.devminor",
rdevminor);
/* Truncation is not necessary here, either. */
/* archive_entry_set_rdevminor(entry_main,
rdevminor & ((1 << 18) - 1)); */
need_extension = 1;
}
}
/*
* Technically, the mtime field in the ustar header can
* support 33 bits, but many platforms use signed 32-bit time
* values. The cutoff of 0x7fffffff here is a compromise.
* Yes, this check is duplicated just below; this helps to
* avoid writing an mtime attribute just to handle a
* high-resolution timestamp in "restricted pax" mode.
*/
if (!need_extension &&
((archive_entry_mtime(entry_main) < 0)
|| (archive_entry_mtime(entry_main) >= 0x7fffffff)))
need_extension = 1;
/* I use a star-compatible file flag attribute. */
p = archive_entry_fflags_text(entry_main);
if (!need_extension && p != NULL && *p != '\0')
need_extension = 1;
/* If there are non-trivial ACL entries, we need an extension. */
if (!need_extension && archive_entry_acl_count(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_ACCESS) > 0)
need_extension = 1;
/* If there are non-trivial ACL entries, we need an extension. */
if (!need_extension && archive_entry_acl_count(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) > 0)
need_extension = 1;
/* If there are extended attributes, we need an extension */
if (!need_extension && archive_entry_xattr_count(entry_original) > 0)
need_extension = 1;
/* If there are sparse info, we need an extension */
if (!need_extension && sparse_count > 0)
need_extension = 1;
/*
* The following items are handled differently in "pax
* restricted" format. In particular, in "pax restricted"
* format they won't be added unless need_extension is
* already set (we're already generating an extended header, so
* may as well include these).
*/
if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED ||
need_extension) {
if (archive_entry_mtime(entry_main) < 0 ||
archive_entry_mtime(entry_main) >= 0x7fffffff ||
archive_entry_mtime_nsec(entry_main) != 0)
add_pax_attr_time(&(pax->pax_header), "mtime",
archive_entry_mtime(entry_main),
archive_entry_mtime_nsec(entry_main));
if (archive_entry_ctime(entry_main) != 0 ||
archive_entry_ctime_nsec(entry_main) != 0)
add_pax_attr_time(&(pax->pax_header), "ctime",
archive_entry_ctime(entry_main),
archive_entry_ctime_nsec(entry_main));
if (archive_entry_atime(entry_main) != 0 ||
archive_entry_atime_nsec(entry_main) != 0)
add_pax_attr_time(&(pax->pax_header), "atime",
archive_entry_atime(entry_main),
archive_entry_atime_nsec(entry_main));
/* Store birth/creationtime only if it's earlier than mtime */
if (archive_entry_birthtime_is_set(entry_main) &&
archive_entry_birthtime(entry_main)
< archive_entry_mtime(entry_main))
add_pax_attr_time(&(pax->pax_header),
"LIBARCHIVE.creationtime",
archive_entry_birthtime(entry_main),
archive_entry_birthtime_nsec(entry_main));
/* I use a star-compatible file flag attribute. */
p = archive_entry_fflags_text(entry_main);
if (p != NULL && *p != '\0')
add_pax_attr(&(pax->pax_header), "SCHILY.fflags", p);
/* I use star-compatible ACL attributes. */
r = archive_entry_acl_text_l(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_ACCESS |
ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID,
&p, NULL, pax->sconv_utf8);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for "
"ACL.access");
return (ARCHIVE_FATAL);
}
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate ACL.access to UTF-8");
ret = ARCHIVE_WARN;
} else if (p != NULL && *p != '\0') {
add_pax_attr(&(pax->pax_header),
"SCHILY.acl.access", p);
}
r = archive_entry_acl_text_l(entry_original,
ARCHIVE_ENTRY_ACL_TYPE_DEFAULT |
ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID,
&p, NULL, pax->sconv_utf8);
if (r != 0) {
if (errno == ENOMEM) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory for "
"ACL.default");
return (ARCHIVE_FATAL);
}
archive_set_error(&a->archive,
ARCHIVE_ERRNO_FILE_FORMAT,
"Can't translate ACL.default to UTF-8");
ret = ARCHIVE_WARN;
} else if (p != NULL && *p != '\0') {
add_pax_attr(&(pax->pax_header),
"SCHILY.acl.default", p);
}
/* We use GNU-tar-compatible sparse attributes. */
if (sparse_count > 0) {
int64_t soffset, slength;
add_pax_attr_int(&(pax->pax_header),
"GNU.sparse.major", 1);
add_pax_attr_int(&(pax->pax_header),
"GNU.sparse.minor", 0);
add_pax_attr(&(pax->pax_header),
"GNU.sparse.name", entry_name.s);
add_pax_attr_int(&(pax->pax_header),
"GNU.sparse.realsize",
archive_entry_size(entry_main));
/* Rename the file name which will be used for
* ustar header to a special name, which GNU
* PAX Format 1.0 requires */
archive_entry_set_pathname(entry_main,
build_gnu_sparse_name(gnu_sparse_name,
entry_name.s));
/*
* - Make a sparse map, which will precede a file data.
* - Get the total size of available data of sparse.
*/
archive_string_sprintf(&(pax->sparse_map), "%d\n",
sparse_count);
while (archive_entry_sparse_next(entry_main,
&soffset, &slength) == ARCHIVE_OK) {
archive_string_sprintf(&(pax->sparse_map),
"%jd\n%jd\n",
(intmax_t)soffset,
(intmax_t)slength);
sparse_total += slength;
if (sparse_list_add(pax, soffset, slength)
!= ARCHIVE_OK) {
archive_set_error(&a->archive,
ENOMEM,
"Can't allocate memory");
archive_entry_free(entry_main);
archive_string_free(&entry_name);
return (ARCHIVE_FATAL);
}
}
}
/* Store extended attributes */
if (archive_write_pax_header_xattrs(a, pax, entry_original)
== ARCHIVE_FATAL) {
archive_entry_free(entry_main);
archive_string_free(&entry_name);
return (ARCHIVE_FATAL);
}
}
/* Only regular files have data. */
if (archive_entry_filetype(entry_main) != AE_IFREG)
archive_entry_set_size(entry_main, 0);
/*
* Pax-restricted does not store data for hardlinks, in order
* to improve compatibility with ustar.
*/
if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE &&
hardlink != NULL)
archive_entry_set_size(entry_main, 0);
/*
* XXX Full pax interchange format does permit a hardlink
* entry to have data associated with it. I'm not supporting
* that here because the client expects me to tell them whether
* or not this format expects data for hardlinks. If I
* don't check here, then every pax archive will end up with
* duplicated data for hardlinks. Someday, there may be
* need to select this behavior, in which case the following
* will need to be revisited. XXX
*/
if (hardlink != NULL)
archive_entry_set_size(entry_main, 0);
/* Save a real file size. */
real_size = archive_entry_size(entry_main);
/*
* Overwrite a file size by the total size of sparse blocks and
* the size of sparse map info. That file size is the length of
* the data, which we will exactly store into an archive file.
*/
if (archive_strlen(&(pax->sparse_map))) {
size_t mapsize = archive_strlen(&(pax->sparse_map));
pax->sparse_map_padding = 0x1ff & (-(ssize_t)mapsize);
archive_entry_set_size(entry_main,
mapsize + pax->sparse_map_padding + sparse_total);
}
/* Format 'ustar' header for main entry.
*
* The trouble with file size: If the reader can't understand
* the file size, they may not be able to locate the next
* entry and the rest of the archive is toast. Pax-compliant
* readers are supposed to ignore the file size in the main
* header, so the question becomes how to maximize portability
* for readers that don't support pax attribute extensions.
* For maximum compatibility, I permit numeric extensions in
* the main header so that the file size stored will always be
* correct, even if it's in a format that only some
* implementations understand. The technique used here is:
*
* a) If possible, follow the standard exactly. This handles
* files up to 8 gigabytes minus 1.
*
* b) If that fails, try octal but omit the field terminator.
* That handles files up to 64 gigabytes minus 1.
*
* c) Otherwise, use base-256 extensions. That handles files
* up to 2^63 in this implementation, with the potential to
* go up to 2^94. That should hold us for a while. ;-)
*
* The non-strict formatter uses similar logic for other
* numeric fields, though they're less critical.
*/
if (__archive_write_format_header_ustar(a, ustarbuff, entry_main, -1, 0,
NULL) == ARCHIVE_FATAL)
return (ARCHIVE_FATAL);
/* If we built any extended attributes, write that entry first. */
if (archive_strlen(&(pax->pax_header)) > 0) {
struct archive_entry *pax_attr_entry;
time_t s;
int64_t uid, gid;
int mode;
pax_attr_entry = archive_entry_new2(&a->archive);
p = entry_name.s;
archive_entry_set_pathname(pax_attr_entry,
build_pax_attribute_name(pax_entry_name, p));
archive_entry_set_size(pax_attr_entry,
archive_strlen(&(pax->pax_header)));
/* Copy uid/gid (but clip to ustar limits). */
uid = archive_entry_uid(entry_main);
if (uid >= 1 << 18)
uid = (1 << 18) - 1;
archive_entry_set_uid(pax_attr_entry, uid);
gid = archive_entry_gid(entry_main);
if (gid >= 1 << 18)
gid = (1 << 18) - 1;
archive_entry_set_gid(pax_attr_entry, gid);
/* Copy mode over (but not setuid/setgid bits) */
mode = archive_entry_mode(entry_main);
#ifdef S_ISUID
mode &= ~S_ISUID;
#endif
#ifdef S_ISGID
mode &= ~S_ISGID;
#endif
#ifdef S_ISVTX
mode &= ~S_ISVTX;
#endif
archive_entry_set_mode(pax_attr_entry, mode);
/* Copy uname/gname. */
archive_entry_set_uname(pax_attr_entry,
archive_entry_uname(entry_main));
archive_entry_set_gname(pax_attr_entry,
archive_entry_gname(entry_main));
/* Copy mtime, but clip to ustar limits. */
s = archive_entry_mtime(entry_main);
if (s < 0) { s = 0; }
if (s >= 0x7fffffff) { s = 0x7fffffff; }
archive_entry_set_mtime(pax_attr_entry, s, 0);
/* Standard ustar doesn't support atime. */
archive_entry_set_atime(pax_attr_entry, 0, 0);
/* Standard ustar doesn't support ctime. */
archive_entry_set_ctime(pax_attr_entry, 0, 0);
r = __archive_write_format_header_ustar(a, paxbuff,
pax_attr_entry, 'x', 1, NULL);
archive_entry_free(pax_attr_entry);
/* Note that the 'x' header shouldn't ever fail to format */
if (r < ARCHIVE_WARN) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"archive_write_pax_header: "
"'x' header failed?! This can't happen.\n");
return (ARCHIVE_FATAL);
} else if (r < ret)
ret = r;
r = __archive_write_output(a, paxbuff, 512);
if (r != ARCHIVE_OK) {
sparse_list_clear(pax);
pax->entry_bytes_remaining = 0;
pax->entry_padding = 0;
return (ARCHIVE_FATAL);
}
pax->entry_bytes_remaining = archive_strlen(&(pax->pax_header));
pax->entry_padding =
0x1ff & (-(int64_t)pax->entry_bytes_remaining);
r = __archive_write_output(a, pax->pax_header.s,
archive_strlen(&(pax->pax_header)));
if (r != ARCHIVE_OK) {
/* If a write fails, we're pretty much toast. */
return (ARCHIVE_FATAL);
}
/* Pad out the end of the entry. */
r = __archive_write_nulls(a, (size_t)pax->entry_padding);
if (r != ARCHIVE_OK) {
/* If a write fails, we're pretty much toast. */
return (ARCHIVE_FATAL);
}
pax->entry_bytes_remaining = pax->entry_padding = 0;
}
/* Write the header for main entry. */
r = __archive_write_output(a, ustarbuff, 512);
if (r != ARCHIVE_OK)
return (r);
/*
* Inform the client of the on-disk size we're using, so
* they can avoid unnecessarily writing a body for something
* that we're just going to ignore.
*/
archive_entry_set_size(entry_original, real_size);
if (pax->sparse_list == NULL && real_size > 0) {
/* This is not a sparse file but we handle its data as
* a sparse block. */
sparse_list_add(pax, 0, real_size);
sparse_total = real_size;
}
pax->entry_padding = 0x1ff & (-(int64_t)sparse_total);
archive_entry_free(entry_main);
archive_string_free(&entry_name);
return (ret);
}
/*
* We need a valid name for the regular 'ustar' entry. This routine
* tries to hack something more-or-less reasonable.
*
* The approach here tries to preserve leading dir names. We do so by
* working with four sections:
* 1) "prefix" directory names,
* 2) "suffix" directory names,
* 3) inserted dir name (optional),
* 4) filename.
*
* These sections must satisfy the following requirements:
* * Parts 1 & 2 together form an initial portion of the dir name.
* * Part 3 is specified by the caller. (It should not contain a leading
* or trailing '/'.)
* * Part 4 forms an initial portion of the base filename.
* * The filename must be <= 99 chars to fit the ustar 'name' field.
* * Parts 2, 3, 4 together must be <= 99 chars to fit the ustar 'name' fld.
* * Part 1 must be <= 155 chars to fit the ustar 'prefix' field.
* * If the original name ends in a '/', the new name must also end in a '/'
* * Trailing '/.' sequences may be stripped.
*
* Note: Recall that the ustar format does not store the '/' separating
* parts 1 & 2, but does store the '/' separating parts 2 & 3.
*/
static char *
build_ustar_entry_name(char *dest, const char *src, size_t src_length,
const char *insert)
{
const char *prefix, *prefix_end;
const char *suffix, *suffix_end;
const char *filename, *filename_end;
char *p;
int need_slash = 0; /* Was there a trailing slash? */
size_t suffix_length = 99;
size_t insert_length;
/* Length of additional dir element to be added. */
if (insert == NULL)
insert_length = 0;
else
/* +2 here allows for '/' before and after the insert. */
insert_length = strlen(insert) + 2;
/* Step 0: Quick bailout in a common case. */
if (src_length < 100 && insert == NULL) {
strncpy(dest, src, src_length);
dest[src_length] = '\0';
return (dest);
}
/* Step 1: Locate filename and enforce the length restriction. */
filename_end = src + src_length;
/* Remove trailing '/' chars and '/.' pairs. */
for (;;) {
if (filename_end > src && filename_end[-1] == '/') {
filename_end --;
need_slash = 1; /* Remember to restore trailing '/'. */
continue;
}
if (filename_end > src + 1 && filename_end[-1] == '.'
&& filename_end[-2] == '/') {
filename_end -= 2;
need_slash = 1; /* "foo/." will become "foo/" */
continue;
}
break;
}
if (need_slash)
suffix_length--;
/* Find start of filename. */
filename = filename_end - 1;
while ((filename > src) && (*filename != '/'))
filename --;
if ((*filename == '/') && (filename < filename_end - 1))
filename ++;
/* Adjust filename_end so that filename + insert fits in 99 chars. */
suffix_length -= insert_length;
if (filename_end > filename + suffix_length)
filename_end = filename + suffix_length;
/* Calculate max size for "suffix" section (#3 above). */
suffix_length -= filename_end - filename;
/* Step 2: Locate the "prefix" section of the dirname, including
* trailing '/'. */
prefix = src;
prefix_end = prefix + 155;
if (prefix_end > filename)
prefix_end = filename;
while (prefix_end > prefix && *prefix_end != '/')
prefix_end--;
if ((prefix_end < filename) && (*prefix_end == '/'))
prefix_end++;
/* Step 3: Locate the "suffix" section of the dirname,
* including trailing '/'. */
suffix = prefix_end;
suffix_end = suffix + suffix_length; /* Enforce limit. */
if (suffix_end > filename)
suffix_end = filename;
if (suffix_end < suffix)
suffix_end = suffix;
while (suffix_end > suffix && *suffix_end != '/')
suffix_end--;
if ((suffix_end < filename) && (*suffix_end == '/'))
suffix_end++;
/* Step 4: Build the new name. */
/* The OpenBSD strlcpy function is safer, but less portable. */
/* Rather than maintain two versions, just use the strncpy version. */
p = dest;
if (prefix_end > prefix) {
strncpy(p, prefix, prefix_end - prefix);
p += prefix_end - prefix;
}
if (suffix_end > suffix) {
strncpy(p, suffix, suffix_end - suffix);
p += suffix_end - suffix;
}
if (insert != NULL) {
/* Note: assume insert does not have leading or trailing '/' */
strcpy(p, insert);
p += strlen(insert);
*p++ = '/';
}
strncpy(p, filename, filename_end - filename);
p += filename_end - filename;
if (need_slash)
*p++ = '/';
*p = '\0';
return (dest);
}
/*
* The ustar header for the pax extended attributes must have a
* reasonable name: SUSv3 requires 'dirname'/PaxHeader.'pid'/'filename'
* where 'pid' is the PID of the archiving process. Unfortunately,
* that makes testing a pain since the output varies for each run,
* so I'm sticking with the simpler 'dirname'/PaxHeader/'filename'
* for now. (Someday, I'll make this settable. Then I can use the
* SUS recommendation as default and test harnesses can override it
* to get predictable results.)
*
* Joerg Schilling has argued that this is unnecessary because, in
* practice, if the pax extended attributes get extracted as regular
* files, no one is going to bother reading those attributes to
* manually restore them. Based on this, 'star' uses
* /tmp/PaxHeader/'basename' as the ustar header name. This is a
* tempting argument, in part because it's simpler than the SUSv3
* recommendation, but I'm not entirely convinced. I'm also
* uncomfortable with the fact that "/tmp" is a Unix-ism.
*
* The following routine leverages build_ustar_entry_name() above and
* so is simpler than you might think. It just needs to provide the
* additional path element and handle a few pathological cases).
*/
static char *
build_pax_attribute_name(char *dest, const char *src)
{
char buff[64];
const char *p;
/* Handle the null filename case. */
if (src == NULL || *src == '\0') {
strcpy(dest, "PaxHeader/blank");
return (dest);
}
/* Prune final '/' and other unwanted final elements. */
p = src + strlen(src);
for (;;) {
/* Ends in "/", remove the '/' */
if (p > src && p[-1] == '/') {
--p;
continue;
}
/* Ends in "/.", remove the '.' */
if (p > src + 1 && p[-1] == '.'
&& p[-2] == '/') {
--p;
continue;
}
break;
}
/* Pathological case: After above, there was nothing left.
* This includes "/." "/./." "/.//./." etc. */
if (p == src) {
strcpy(dest, "/PaxHeader/rootdir");
return (dest);
}
/* Convert unadorned "." into a suitable filename. */
if (*src == '.' && p == src + 1) {
strcpy(dest, "PaxHeader/currentdir");
return (dest);
}
/*
* TODO: Push this string into the 'pax' structure to avoid
* recomputing it every time. That will also open the door
* to having clients override it.
*/
#if HAVE_GETPID && 0 /* Disable this for now; see above comment. */
sprintf(buff, "PaxHeader.%d", getpid());
#else
/* If the platform can't fetch the pid, don't include it. */
strcpy(buff, "PaxHeader");
#endif
/* General case: build a ustar-compatible name adding
* "/PaxHeader/". */
build_ustar_entry_name(dest, src, p - src, buff);
return (dest);
}
/*
* GNU PAX Format 1.0 requires the special name, which pattern is:
* <dir>/GNUSparseFile.<pid>/<original file name>
*
* This function is used for only Sparse file, a file type of which
* is regular file.
*/
static char *
build_gnu_sparse_name(char *dest, const char *src)
{
char buff[64];
const char *p;
/* Handle the null filename case. */
if (src == NULL || *src == '\0') {
strcpy(dest, "GNUSparseFile/blank");
return (dest);
}
/* Prune final '/' and other unwanted final elements. */
p = src + strlen(src);
for (;;) {
/* Ends in "/", remove the '/' */
if (p > src && p[-1] == '/') {
--p;
continue;
}
/* Ends in "/.", remove the '.' */
if (p > src + 1 && p[-1] == '.'
&& p[-2] == '/') {
--p;
continue;
}
break;
}
#if HAVE_GETPID && 0 /* Disable this as pax attribute name. */
sprintf(buff, "GNUSparseFile.%d", getpid());
#else
/* If the platform can't fetch the pid, don't include it. */
strcpy(buff, "GNUSparseFile");
#endif
/* General case: build a ustar-compatible name adding
* "/GNUSparseFile/". */
build_ustar_entry_name(dest, src, p - src, buff);
return (dest);
}
/* Write two null blocks for the end of archive */
static int
archive_write_pax_close(struct archive_write *a)
{
return (__archive_write_nulls(a, 512 * 2));
}
static int
archive_write_pax_free(struct archive_write *a)
{
struct pax *pax;
pax = (struct pax *)a->format_data;
if (pax == NULL)
return (ARCHIVE_OK);
archive_string_free(&pax->pax_header);
archive_string_free(&pax->sparse_map);
archive_string_free(&pax->l_url_encoded_name);
sparse_list_clear(pax);
free(pax);
a->format_data = NULL;
return (ARCHIVE_OK);
}
static int
archive_write_pax_finish_entry(struct archive_write *a)
{
struct pax *pax;
uint64_t remaining;
int ret;
pax = (struct pax *)a->format_data;
remaining = pax->entry_bytes_remaining;
if (remaining == 0) {
while (pax->sparse_list) {
struct sparse_block *sb;
if (!pax->sparse_list->is_hole)
remaining += pax->sparse_list->remaining;
sb = pax->sparse_list->next;
free(pax->sparse_list);
pax->sparse_list = sb;
}
}
ret = __archive_write_nulls(a, (size_t)(remaining + pax->entry_padding));
pax->entry_bytes_remaining = pax->entry_padding = 0;
return (ret);
}
static ssize_t
archive_write_pax_data(struct archive_write *a, const void *buff, size_t s)
{
struct pax *pax;
size_t ws;
size_t total;
int ret;
pax = (struct pax *)a->format_data;
/*
* According to GNU PAX format 1.0, write a sparse map
* before the body.
*/
if (archive_strlen(&(pax->sparse_map))) {
ret = __archive_write_output(a, pax->sparse_map.s,
archive_strlen(&(pax->sparse_map)));
if (ret != ARCHIVE_OK)
return (ret);
ret = __archive_write_nulls(a, pax->sparse_map_padding);
if (ret != ARCHIVE_OK)
return (ret);
archive_string_empty(&(pax->sparse_map));
}
total = 0;
while (total < s) {
const unsigned char *p;
while (pax->sparse_list != NULL &&
pax->sparse_list->remaining == 0) {
struct sparse_block *sb = pax->sparse_list->next;
free(pax->sparse_list);
pax->sparse_list = sb;
}
if (pax->sparse_list == NULL)
return (total);
p = ((const unsigned char *)buff) + total;
ws = s - total;
if (ws > pax->sparse_list->remaining)
ws = (size_t)pax->sparse_list->remaining;
if (pax->sparse_list->is_hole) {
/* Current block is hole thus we do not write
* the body. */
pax->sparse_list->remaining -= ws;
total += ws;
continue;
}
ret = __archive_write_output(a, p, ws);
pax->sparse_list->remaining -= ws;
total += ws;
if (ret != ARCHIVE_OK)
return (ret);
}
return (total);
}
static int
has_non_ASCII(const char *_p)
{
const unsigned char *p = (const unsigned char *)_p;
if (p == NULL)
return (1);
while (*p != '\0' && *p < 128)
p++;
return (*p != '\0');
}
/*
* Used by extended attribute support; encodes the name
* so that there will be no '=' characters in the result.
*/
static char *
url_encode(const char *in)
{
const char *s;
char *d;
int out_len = 0;
char *out;
for (s = in; *s != '\0'; s++) {
if (*s < 33 || *s > 126 || *s == '%' || *s == '=')
out_len += 3;
else
out_len++;
}
out = (char *)malloc(out_len + 1);
if (out == NULL)
return (NULL);
for (s = in, d = out; *s != '\0'; s++) {
/* encode any non-printable ASCII character or '%' or '=' */
if (*s < 33 || *s > 126 || *s == '%' || *s == '=') {
/* URL encoding is '%' followed by two hex digits */
*d++ = '%';
*d++ = "0123456789ABCDEF"[0x0f & (*s >> 4)];
*d++ = "0123456789ABCDEF"[0x0f & *s];
} else {
*d++ = *s;
}
}
*d = '\0';
return (out);
}
/*
* Encode a sequence of bytes into a C string using base-64 encoding.
*
* Returns a null-terminated C string allocated with malloc(); caller
* is responsible for freeing the result.
*/
static char *
base64_encode(const char *s, size_t len)
{
static const char digits[64] =
{ 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O',
'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d',
'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s',
't','u','v','w','x','y','z','0','1','2','3','4','5','6','7',
'8','9','+','/' };
int v;
char *d, *out;
/* 3 bytes becomes 4 chars, but round up and allow for trailing NUL */
out = (char *)malloc((len * 4 + 2) / 3 + 1);
if (out == NULL)
return (NULL);
d = out;
/* Convert each group of 3 bytes into 4 characters. */
while (len >= 3) {
v = (((int)s[0] << 16) & 0xff0000)
| (((int)s[1] << 8) & 0xff00)
| (((int)s[2]) & 0x00ff);
s += 3;
len -= 3;
*d++ = digits[(v >> 18) & 0x3f];
*d++ = digits[(v >> 12) & 0x3f];
*d++ = digits[(v >> 6) & 0x3f];
*d++ = digits[(v) & 0x3f];
}
/* Handle final group of 1 byte (2 chars) or 2 bytes (3 chars). */
switch (len) {
case 0: break;
case 1:
v = (((int)s[0] << 16) & 0xff0000);
*d++ = digits[(v >> 18) & 0x3f];
*d++ = digits[(v >> 12) & 0x3f];
break;
case 2:
v = (((int)s[0] << 16) & 0xff0000)
| (((int)s[1] << 8) & 0xff00);
*d++ = digits[(v >> 18) & 0x3f];
*d++ = digits[(v >> 12) & 0x3f];
*d++ = digits[(v >> 6) & 0x3f];
break;
}
/* Add trailing NUL character so output is a valid C string. */
*d = '\0';
return (out);
}
static void
sparse_list_clear(struct pax *pax)
{
while (pax->sparse_list != NULL) {
struct sparse_block *sb = pax->sparse_list;
pax->sparse_list = sb->next;
free(sb);
}
pax->sparse_tail = NULL;
}
static int
_sparse_list_add_block(struct pax *pax, int64_t offset, int64_t length,
int is_hole)
{
struct sparse_block *sb;
sb = (struct sparse_block *)malloc(sizeof(*sb));
if (sb == NULL)
return (ARCHIVE_FATAL);
sb->next = NULL;
sb->is_hole = is_hole;
sb->offset = offset;
sb->remaining = length;
if (pax->sparse_list == NULL || pax->sparse_tail == NULL)
pax->sparse_list = pax->sparse_tail = sb;
else {
pax->sparse_tail->next = sb;
pax->sparse_tail = sb;
}
return (ARCHIVE_OK);
}
static int
sparse_list_add(struct pax *pax, int64_t offset, int64_t length)
{
int64_t last_offset;
int r;
if (pax->sparse_tail == NULL)
last_offset = 0;
else {
last_offset = pax->sparse_tail->offset +
pax->sparse_tail->remaining;
}
if (last_offset < offset) {
/* Add a hole block. */
r = _sparse_list_add_block(pax, last_offset,
offset - last_offset, 1);
if (r != ARCHIVE_OK)
return (r);
}
/* Add data block. */
return (_sparse_list_add_block(pax, offset, length, 0));
}
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