/*-
* Copyright (c) 2003-2009 Tim Kientzle
* Copyright (c) 2010-2012 Michihiro NAKAJIMA
* Copyright (c) 2016 Martin Matuska
* 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");
/* This is the tree-walking code for POSIX systems. */
#if !defined(_WIN32) || defined(__CYGWIN__)
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_EXTATTR_H
#include <sys/extattr.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if defined(HAVE_SYS_XATTR_H)
#include <sys/xattr.h>
#elif defined(HAVE_ATTR_XATTR_H)
#include <attr/xattr.h>
#endif
#ifdef HAVE_SYS_EA_H
#include <sys/ea.h>
#endif
#ifdef HAVE_COPYFILE_H
#include <copyfile.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_LINUX_TYPES_H
#include <linux/types.h>
#endif
#ifdef HAVE_LINUX_FIEMAP_H
#include <linux/fiemap.h>
#endif
#ifdef HAVE_LINUX_FS_H
#include <linux/fs.h>
#endif
/*
* Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h.
* As the include guards don't agree, the order of include is important.
*/
#ifdef HAVE_LINUX_EXT2_FS_H
#include <linux/ext2_fs.h> /* for Linux file flags */
#endif
#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__)
#include <ext2fs/ext2_fs.h> /* Linux file flags, broken on Cygwin */
#endif
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_read_disk_private.h"
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
static int setup_mac_metadata(struct archive_read_disk *,
struct archive_entry *, int *fd);
static int setup_xattrs(struct archive_read_disk *,
struct archive_entry *, int *fd);
static int setup_sparse(struct archive_read_disk *,
struct archive_entry *, int *fd);
#if defined(HAVE_LINUX_FIEMAP_H)
static int setup_sparse_fiemap(struct archive_read_disk *,
struct archive_entry *, int *fd);
#endif
#if !ARCHIVE_ACL_SUPPORT
int
archive_read_disk_entry_setup_acls(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
(void)a; /* UNUSED */
(void)entry; /* UNUSED */
(void)fd; /* UNUSED */
return (ARCHIVE_OK);
}
#endif
/*
* Enter working directory and return working pathname of archive_entry.
* If a pointer to an integer is provided and its value is below zero
* open a file descriptor on this pathname.
*/
const char *
archive_read_disk_entry_setup_path(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
const char *path;
path = archive_entry_sourcepath(entry);
if (path == NULL || (a->tree != NULL &&
a->tree_enter_working_dir(a->tree) != 0))
path = archive_entry_pathname(entry);
if (path == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Couldn't determine path");
} else if (fd != NULL && *fd < 0 && a->tree != NULL &&
(a->follow_symlinks || archive_entry_filetype(entry) != AE_IFLNK)) {
*fd = a->open_on_current_dir(a->tree, path,
O_RDONLY | O_NONBLOCK);
}
return (path);
}
int
archive_read_disk_entry_from_file(struct archive *_a,
struct archive_entry *entry,
int fd,
const struct stat *st)
{
struct archive_read_disk *a = (struct archive_read_disk *)_a;
const char *path, *name;
struct stat s;
int initial_fd = fd;
int r, r1;
archive_clear_error(_a);
path = archive_entry_sourcepath(entry);
if (path == NULL)
path = archive_entry_pathname(entry);
if (a->tree == NULL) {
if (st == NULL) {
#if HAVE_FSTAT
if (fd >= 0) {
if (fstat(fd, &s) != 0) {
archive_set_error(&a->archive, errno,
"Can't fstat");
return (ARCHIVE_FAILED);
}
} else
#endif
#if HAVE_LSTAT
if (!a->follow_symlinks) {
if (lstat(path, &s) != 0) {
archive_set_error(&a->archive, errno,
"Can't lstat %s", path);
return (ARCHIVE_FAILED);
}
} else
#endif
if (stat(path, &s) != 0) {
archive_set_error(&a->archive, errno,
"Can't stat %s", path);
return (ARCHIVE_FAILED);
}
st = &s;
}
archive_entry_copy_stat(entry, st);
}
/* Lookup uname/gname */
name = archive_read_disk_uname(_a, archive_entry_uid(entry));
if (name != NULL)
archive_entry_copy_uname(entry, name);
name = archive_read_disk_gname(_a, archive_entry_gid(entry));
if (name != NULL)
archive_entry_copy_gname(entry, name);
#ifdef HAVE_STRUCT_STAT_ST_FLAGS
/* On FreeBSD, we get flags for free with the stat. */
/* TODO: Does this belong in copy_stat()? */
if ((a->flags & ARCHIVE_READDISK_NO_FFLAGS) == 0 && st->st_flags != 0)
archive_entry_set_fflags(entry, st->st_flags, 0);
#endif
#if (defined(FS_IOC_GETFLAGS) && defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \
(defined(EXT2_IOC_GETFLAGS) && defined(HAVE_WORKING_EXT2_IOC_GETFLAGS))
/* Linux requires an extra ioctl to pull the flags. Although
* this is an extra step, it has a nice side-effect: We get an
* open file descriptor which we can use in the subsequent lookups. */
if ((a->flags & ARCHIVE_READDISK_NO_FFLAGS) == 0 &&
(S_ISREG(st->st_mode) || S_ISDIR(st->st_mode))) {
if (fd < 0) {
if (a->tree != NULL)
fd = a->open_on_current_dir(a->tree, path,
O_RDONLY | O_NONBLOCK | O_CLOEXEC);
else
fd = open(path, O_RDONLY | O_NONBLOCK |
O_CLOEXEC);
__archive_ensure_cloexec_flag(fd);
}
if (fd >= 0) {
int stflags;
r = ioctl(fd,
#if defined(FS_IOC_GETFLAGS)
FS_IOC_GETFLAGS,
#else
EXT2_IOC_GETFLAGS,
#endif
&stflags);
if (r == 0 && stflags != 0)
archive_entry_set_fflags(entry, stflags, 0);
}
}
#endif
#if defined(HAVE_READLINK) || defined(HAVE_READLINKAT)
if (S_ISLNK(st->st_mode)) {
size_t linkbuffer_len = st->st_size + 1;
char *linkbuffer;
int lnklen;
linkbuffer = malloc(linkbuffer_len);
if (linkbuffer == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Couldn't read link data");
return (ARCHIVE_FAILED);
}
if (a->tree != NULL) {
#ifdef HAVE_READLINKAT
lnklen = readlinkat(a->tree_current_dir_fd(a->tree),
path, linkbuffer, linkbuffer_len);
#else
if (a->tree_enter_working_dir(a->tree) != 0) {
archive_set_error(&a->archive, errno,
"Couldn't read link data");
free(linkbuffer);
return (ARCHIVE_FAILED);
}
lnklen = readlink(path, linkbuffer, linkbuffer_len);
#endif /* HAVE_READLINKAT */
} else
lnklen = readlink(path, linkbuffer, linkbuffer_len);
if (lnklen < 0) {
archive_set_error(&a->archive, errno,
"Couldn't read link data");
free(linkbuffer);
return (ARCHIVE_FAILED);
}
linkbuffer[lnklen] = 0;
archive_entry_set_symlink(entry, linkbuffer);
free(linkbuffer);
}
#endif /* HAVE_READLINK || HAVE_READLINKAT */
r = 0;
if ((a->flags & ARCHIVE_READDISK_NO_ACL) == 0)
r = archive_read_disk_entry_setup_acls(a, entry, &fd);
if ((a->flags & ARCHIVE_READDISK_NO_XATTR) == 0) {
r1 = setup_xattrs(a, entry, &fd);
if (r1 < r)
r = r1;
}
if (a->flags & ARCHIVE_READDISK_MAC_COPYFILE) {
r1 = setup_mac_metadata(a, entry, &fd);
if (r1 < r)
r = r1;
}
r1 = setup_sparse(a, entry, &fd);
if (r1 < r)
r = r1;
/* If we opened the file earlier in this function, close it. */
if (initial_fd != fd)
close(fd);
return (r);
}
#if defined(__APPLE__) && defined(HAVE_COPYFILE_H)
/*
* The Mac OS "copyfile()" API copies the extended metadata for a
* file into a separate file in AppleDouble format (see RFC 1740).
*
* Mac OS tar and cpio implementations store this extended
* metadata as a separate entry just before the regular entry
* with a "._" prefix added to the filename.
*
* Note that this is currently done unconditionally; the tar program has
* an option to discard this information before the archive is written.
*
* TODO: If there's a failure, report it and return ARCHIVE_WARN.
*/
static int
setup_mac_metadata(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
int tempfd = -1;
int copyfile_flags = COPYFILE_NOFOLLOW | COPYFILE_ACL | COPYFILE_XATTR;
struct stat copyfile_stat;
int ret = ARCHIVE_OK;
void *buff = NULL;
int have_attrs;
const char *name, *tempdir;
struct archive_string tempfile;
(void)fd; /* UNUSED */
name = archive_read_disk_entry_setup_path(a, entry, NULL);
if (name == NULL)
return (ARCHIVE_WARN);
/* Short-circuit if there's nothing to do. */
have_attrs = copyfile(name, NULL, 0, copyfile_flags | COPYFILE_CHECK);
if (have_attrs == -1) {
archive_set_error(&a->archive, errno,
"Could not check extended attributes");
return (ARCHIVE_WARN);
}
if (have_attrs == 0)
return (ARCHIVE_OK);
tempdir = NULL;
if (issetugid() == 0)
tempdir = getenv("TMPDIR");
if (tempdir == NULL)
tempdir = _PATH_TMP;
archive_string_init(&tempfile);
archive_strcpy(&tempfile, tempdir);
archive_strcat(&tempfile, "tar.md.XXXXXX");
tempfd = mkstemp(tempfile.s);
if (tempfd < 0) {
archive_set_error(&a->archive, errno,
"Could not open extended attribute file");
ret = ARCHIVE_WARN;
goto cleanup;
}
__archive_ensure_cloexec_flag(tempfd);
/* XXX I wish copyfile() could pack directly to a memory
* buffer; that would avoid the temp file here. For that
* matter, it would be nice if fcopyfile() actually worked,
* that would reduce the many open/close races here. */
if (copyfile(name, tempfile.s, 0, copyfile_flags | COPYFILE_PACK)) {
archive_set_error(&a->archive, errno,
"Could not pack extended attributes");
ret = ARCHIVE_WARN;
goto cleanup;
}
if (fstat(tempfd, ©file_stat)) {
archive_set_error(&a->archive, errno,
"Could not check size of extended attributes");
ret = ARCHIVE_WARN;
goto cleanup;
}
buff = malloc(copyfile_stat.st_size);
if (buff == NULL) {
archive_set_error(&a->archive, errno,
"Could not allocate memory for extended attributes");
ret = ARCHIVE_WARN;
goto cleanup;
}
if (copyfile_stat.st_size != read(tempfd, buff, copyfile_stat.st_size)) {
archive_set_error(&a->archive, errno,
"Could not read extended attributes into memory");
ret = ARCHIVE_WARN;
goto cleanup;
}
archive_entry_copy_mac_metadata(entry, buff, copyfile_stat.st_size);
cleanup:
if (tempfd >= 0) {
close(tempfd);
unlink(tempfile.s);
}
archive_string_free(&tempfile);
free(buff);
return (ret);
}
#else
/*
* Stub implementation for non-Mac systems.
*/
static int
setup_mac_metadata(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
(void)a; /* UNUSED */
(void)entry; /* UNUSED */
(void)fd; /* UNUSED */
return (ARCHIVE_OK);
}
#endif
#if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX
/*
* Linux, Darwin and AIX extended attribute support.
*
* TODO: By using a stack-allocated buffer for the first
* call to getxattr(), we might be able to avoid the second
* call entirely. We only need the second call if the
* stack-allocated buffer is too small. But a modest buffer
* of 1024 bytes or so will often be big enough. Same applies
* to listxattr().
*/
static int
setup_xattr(struct archive_read_disk *a,
struct archive_entry *entry, const char *name, int fd, const char *accpath)
{
ssize_t size;
void *value = NULL;
if (fd >= 0) {
#if ARCHIVE_XATTR_LINUX
size = fgetxattr(fd, name, NULL, 0);
#elif ARCHIVE_XATTR_DARWIN
size = fgetxattr(fd, name, NULL, 0, 0, 0);
#elif ARCHIVE_XATTR_AIX
size = fgetea(fd, name, NULL, 0);
#endif
} else if (!a->follow_symlinks) {
#if ARCHIVE_XATTR_LINUX
size = lgetxattr(accpath, name, NULL, 0);
#elif ARCHIVE_XATTR_DARWIN
size = getxattr(accpath, name, NULL, 0, 0, XATTR_NOFOLLOW);
#elif ARCHIVE_XATTR_AIX
size = lgetea(accpath, name, NULL, 0);
#endif
} else {
#if ARCHIVE_XATTR_LINUX
size = getxattr(accpath, name, NULL, 0);
#elif ARCHIVE_XATTR_DARWIN
size = getxattr(accpath, name, NULL, 0, 0, 0);
#elif ARCHIVE_XATTR_AIX
size = getea(accpath, name, NULL, 0);
#endif
}
if (size == -1) {
archive_set_error(&a->archive, errno,
"Couldn't query extended attribute");
return (ARCHIVE_WARN);
}
if (size > 0 && (value = malloc(size)) == NULL) {
archive_set_error(&a->archive, errno, "Out of memory");
return (ARCHIVE_FATAL);
}
if (fd >= 0) {
#if ARCHIVE_XATTR_LINUX
size = fgetxattr(fd, name, value, size);
#elif ARCHIVE_XATTR_DARWIN
size = fgetxattr(fd, name, value, size, 0, 0);
#elif ARCHIVE_XATTR_AIX
size = fgetea(fd, name, value, size);
#endif
} else if (!a->follow_symlinks) {
#if ARCHIVE_XATTR_LINUX
size = lgetxattr(accpath, name, value, size);
#elif ARCHIVE_XATTR_DARWIN
size = getxattr(accpath, name, value, size, 0, XATTR_NOFOLLOW);
#elif ARCHIVE_XATTR_AIX
size = lgetea(accpath, name, value, size);
#endif
} else {
#if ARCHIVE_XATTR_LINUX
size = getxattr(accpath, name, value, size);
#elif ARCHIVE_XATTR_DARWIN
size = getxattr(accpath, name, value, size, 0, 0);
#elif ARCHIVE_XATTR_AIX
size = getea(accpath, name, value, size);
#endif
}
if (size == -1) {
archive_set_error(&a->archive, errno,
"Couldn't read extended attribute");
return (ARCHIVE_WARN);
}
archive_entry_xattr_add_entry(entry, name, value, size);
free(value);
return (ARCHIVE_OK);
}
static int
setup_xattrs(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
char *list, *p;
const char *path;
ssize_t list_size;
path = NULL;
if (*fd < 0) {
path = archive_read_disk_entry_setup_path(a, entry, fd);
if (path == NULL)
return (ARCHIVE_WARN);
}
if (*fd >= 0) {
#if ARCHIVE_XATTR_LINUX
list_size = flistxattr(*fd, NULL, 0);
#elif ARCHIVE_XATTR_DARWIN
list_size = flistxattr(*fd, NULL, 0, 0);
#elif ARCHIVE_XATTR_AIX
list_size = flistea(*fd, NULL, 0);
#endif
} else if (!a->follow_symlinks) {
#if ARCHIVE_XATTR_LINUX
list_size = llistxattr(path, NULL, 0);
#elif ARCHIVE_XATTR_DARWIN
list_size = listxattr(path, NULL, 0, XATTR_NOFOLLOW);
#elif ARCHIVE_XATTR_AIX
list_size = llistea(path, NULL, 0);
#endif
} else {
#if ARCHIVE_XATTR_LINUX
list_size = listxattr(path, NULL, 0);
#elif ARCHIVE_XATTR_DARWIN
list_size = listxattr(path, NULL, 0, 0);
#elif ARCHIVE_XATTR_AIX
list_size = listea(path, NULL, 0);
#endif
}
if (list_size == -1) {
if (errno == ENOTSUP || errno == ENOSYS)
return (ARCHIVE_OK);
archive_set_error(&a->archive, errno,
"Couldn't list extended attributes");
return (ARCHIVE_WARN);
}
if (list_size == 0)
return (ARCHIVE_OK);
if ((list = malloc(list_size)) == NULL) {
archive_set_error(&a->archive, errno, "Out of memory");
return (ARCHIVE_FATAL);
}
if (*fd >= 0) {
#if ARCHIVE_XATTR_LINUX
list_size = flistxattr(*fd, list, list_size);
#elif ARCHIVE_XATTR_DARWIN
list_size = flistxattr(*fd, list, list_size, 0);
#elif ARCHIVE_XATTR_AIX
list_size = flistea(*fd, list, list_size);
#endif
} else if (!a->follow_symlinks) {
#if ARCHIVE_XATTR_LINUX
list_size = llistxattr(path, list, list_size);
#elif ARCHIVE_XATTR_DARWIN
list_size = listxattr(path, list, list_size, XATTR_NOFOLLOW);
#elif ARCHIVE_XATTR_AIX
list_size = llistea(path, list, list_size);
#endif
} else {
#if ARCHIVE_XATTR_LINUX
list_size = listxattr(path, list, list_size);
#elif ARCHIVE_XATTR_DARWIN
list_size = listxattr(path, list, list_size, 0);
#elif ARCHIVE_XATTR_AIX
list_size = listea(path, list, list_size);
#endif
}
if (list_size == -1) {
archive_set_error(&a->archive, errno,
"Couldn't retrieve extended attributes");
free(list);
return (ARCHIVE_WARN);
}
for (p = list; (p - list) < list_size; p += strlen(p) + 1) {
#if ARCHIVE_XATTR_LINUX
/* Linux: skip POSIX.1e ACL extended attributes */
if (strncmp(p, "system.", 7) == 0 &&
(strcmp(p + 7, "posix_acl_access") == 0 ||
strcmp(p + 7, "posix_acl_default") == 0))
continue;
if (strncmp(p, "trusted.SGI_", 12) == 0 &&
(strcmp(p + 12, "ACL_DEFAULT") == 0 ||
strcmp(p + 12, "ACL_FILE") == 0))
continue;
/* Linux: xfsroot namespace is obsolete and unsupported */
if (strncmp(p, "xfsroot.", 8) == 0)
continue;
#endif
setup_xattr(a, entry, p, *fd, path);
}
free(list);
return (ARCHIVE_OK);
}
#elif ARCHIVE_XATTR_FREEBSD
/*
* FreeBSD extattr interface.
*/
/* TODO: Implement this. Follow the Linux model above, but
* with FreeBSD-specific system calls, of course. Be careful
* to not include the system extattrs that hold ACLs; we handle
* those separately.
*/
static int
setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
int namespace, const char *name, const char *fullname, int fd,
const char *path);
static int
setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
int namespace, const char *name, const char *fullname, int fd,
const char *accpath)
{
ssize_t size;
void *value = NULL;
if (fd >= 0)
size = extattr_get_fd(fd, namespace, name, NULL, 0);
else if (!a->follow_symlinks)
size = extattr_get_link(accpath, namespace, name, NULL, 0);
else
size = extattr_get_file(accpath, namespace, name, NULL, 0);
if (size == -1) {
archive_set_error(&a->archive, errno,
"Couldn't query extended attribute");
return (ARCHIVE_WARN);
}
if (size > 0 && (value = malloc(size)) == NULL) {
archive_set_error(&a->archive, errno, "Out of memory");
return (ARCHIVE_FATAL);
}
if (fd >= 0)
size = extattr_get_fd(fd, namespace, name, value, size);
else if (!a->follow_symlinks)
size = extattr_get_link(accpath, namespace, name, value, size);
else
size = extattr_get_file(accpath, namespace, name, value, size);
if (size == -1) {
free(value);
archive_set_error(&a->archive, errno,
"Couldn't read extended attribute");
return (ARCHIVE_WARN);
}
archive_entry_xattr_add_entry(entry, fullname, value, size);
free(value);
return (ARCHIVE_OK);
}
static int
setup_xattrs(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
char buff[512];
char *list, *p;
ssize_t list_size;
const char *path;
int namespace = EXTATTR_NAMESPACE_USER;
path = NULL;
if (*fd < 0) {
path = archive_read_disk_entry_setup_path(a, entry, fd);
if (path == NULL)
return (ARCHIVE_WARN);
}
if (*fd >= 0)
list_size = extattr_list_fd(*fd, namespace, NULL, 0);
else if (!a->follow_symlinks)
list_size = extattr_list_link(path, namespace, NULL, 0);
else
list_size = extattr_list_file(path, namespace, NULL, 0);
if (list_size == -1 && errno == EOPNOTSUPP)
return (ARCHIVE_OK);
if (list_size == -1) {
archive_set_error(&a->archive, errno,
"Couldn't list extended attributes");
return (ARCHIVE_WARN);
}
if (list_size == 0)
return (ARCHIVE_OK);
if ((list = malloc(list_size)) == NULL) {
archive_set_error(&a->archive, errno, "Out of memory");
return (ARCHIVE_FATAL);
}
if (*fd >= 0)
list_size = extattr_list_fd(*fd, namespace, list, list_size);
else if (!a->follow_symlinks)
list_size = extattr_list_link(path, namespace, list, list_size);
else
list_size = extattr_list_file(path, namespace, list, list_size);
if (list_size == -1) {
archive_set_error(&a->archive, errno,
"Couldn't retrieve extended attributes");
free(list);
return (ARCHIVE_WARN);
}
p = list;
while ((p - list) < list_size) {
size_t len = 255 & (int)*p;
char *name;
strcpy(buff, "user.");
name = buff + strlen(buff);
memcpy(name, p + 1, len);
name[len] = '\0';
setup_xattr(a, entry, namespace, name, buff, *fd, path);
p += 1 + len;
}
free(list);
return (ARCHIVE_OK);
}
#else
/*
* Generic (stub) extended attribute support.
*/
static int
setup_xattrs(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
(void)a; /* UNUSED */
(void)entry; /* UNUSED */
(void)fd; /* UNUSED */
return (ARCHIVE_OK);
}
#endif
#if defined(HAVE_LINUX_FIEMAP_H)
/*
* Linux FIEMAP sparse interface.
*
* The FIEMAP ioctl returns an "extent" for each physical allocation
* on disk. We need to process those to generate a more compact list
* of logical file blocks. We also need to be very careful to use
* FIEMAP_FLAG_SYNC here, since there are reports that Linux sometimes
* does not report allocations for newly-written data that hasn't
* been synced to disk.
*
* It's important to return a minimal sparse file list because we want
* to not trigger sparse file extensions if we don't have to, since
* not all readers support them.
*/
static int
setup_sparse_fiemap(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
char buff[4096];
struct fiemap *fm;
struct fiemap_extent *fe;
int64_t size;
int count, do_fiemap, iters;
int exit_sts = ARCHIVE_OK;
const char *path;
if (archive_entry_filetype(entry) != AE_IFREG
|| archive_entry_size(entry) <= 0
|| archive_entry_hardlink(entry) != NULL)
return (ARCHIVE_OK);
if (*fd < 0) {
path = archive_read_disk_entry_setup_path(a, entry, NULL);
if (path == NULL)
return (ARCHIVE_FAILED);
if (a->tree != NULL)
*fd = a->open_on_current_dir(a->tree, path,
O_RDONLY | O_NONBLOCK | O_CLOEXEC);
else
*fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
if (*fd < 0) {
archive_set_error(&a->archive, errno,
"Can't open `%s'", path);
return (ARCHIVE_FAILED);
}
__archive_ensure_cloexec_flag(*fd);
}
/* Initialize buffer to avoid the error valgrind complains about. */
memset(buff, 0, sizeof(buff));
count = (sizeof(buff) - sizeof(*fm))/sizeof(*fe);
fm = (struct fiemap *)buff;
fm->fm_start = 0;
fm->fm_length = ~0ULL;;
fm->fm_flags = FIEMAP_FLAG_SYNC;
fm->fm_extent_count = count;
do_fiemap = 1;
size = archive_entry_size(entry);
for (iters = 0; ; ++iters) {
int i, r;
r = ioctl(*fd, FS_IOC_FIEMAP, fm);
if (r < 0) {
/* When something error happens, it is better we
* should return ARCHIVE_OK because an earlier
* version(<2.6.28) cannot perform FS_IOC_FIEMAP. */
goto exit_setup_sparse_fiemap;
}
if (fm->fm_mapped_extents == 0) {
if (iters == 0) {
/* Fully sparse file; insert a zero-length "data" entry */
archive_entry_sparse_add_entry(entry, 0, 0);
}
break;
}
fe = fm->fm_extents;
for (i = 0; i < (int)fm->fm_mapped_extents; i++, fe++) {
if (!(fe->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
/* The fe_length of the last block does not
* adjust itself to its size files. */
int64_t length = fe->fe_length;
if (fe->fe_logical + length > (uint64_t)size)
length -= fe->fe_logical + length - size;
if (fe->fe_logical == 0 && length == size) {
/* This is not sparse. */
do_fiemap = 0;
break;
}
if (length > 0)
archive_entry_sparse_add_entry(entry,
fe->fe_logical, length);
}
if (fe->fe_flags & FIEMAP_EXTENT_LAST)
do_fiemap = 0;
}
if (do_fiemap) {
fe = fm->fm_extents + fm->fm_mapped_extents -1;
fm->fm_start = fe->fe_logical + fe->fe_length;
} else
break;
}
exit_setup_sparse_fiemap:
return (exit_sts);
}
#if !defined(SEEK_HOLE) || !defined(SEEK_DATA)
static int
setup_sparse(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
return setup_sparse_fiemap(a, entry, fd);
}
#endif
#endif /* defined(HAVE_LINUX_FIEMAP_H) */
#if defined(SEEK_HOLE) && defined(SEEK_DATA)
/*
* SEEK_HOLE sparse interface (FreeBSD, Linux, Solaris)
*/
static int
setup_sparse(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
int64_t size;
off_t initial_off;
off_t off_s, off_e;
int exit_sts = ARCHIVE_OK;
int check_fully_sparse = 0;
const char *path;
if (archive_entry_filetype(entry) != AE_IFREG
|| archive_entry_size(entry) <= 0
|| archive_entry_hardlink(entry) != NULL)
return (ARCHIVE_OK);
/* Does filesystem support the reporting of hole ? */
if (*fd < 0)
path = archive_read_disk_entry_setup_path(a, entry, fd);
else
path = NULL;
if (*fd >= 0) {
#ifdef _PC_MIN_HOLE_SIZE
if (fpathconf(*fd, _PC_MIN_HOLE_SIZE) <= 0)
return (ARCHIVE_OK);
#endif
initial_off = lseek(*fd, 0, SEEK_CUR);
if (initial_off != 0)
lseek(*fd, 0, SEEK_SET);
} else {
if (path == NULL)
return (ARCHIVE_FAILED);
#ifdef _PC_MIN_HOLE_SIZE
if (pathconf(path, _PC_MIN_HOLE_SIZE) <= 0)
return (ARCHIVE_OK);
#endif
*fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
if (*fd < 0) {
archive_set_error(&a->archive, errno,
"Can't open `%s'", path);
return (ARCHIVE_FAILED);
}
__archive_ensure_cloexec_flag(*fd);
initial_off = 0;
}
#ifndef _PC_MIN_HOLE_SIZE
/* Check if the underlying filesystem supports seek hole */
off_s = lseek(*fd, 0, SEEK_HOLE);
if (off_s < 0)
#if defined(HAVE_LINUX_FIEMAP_H)
return setup_sparse_fiemap(a, entry, fd);
#else
goto exit_setup_sparse;
#endif
else if (off_s > 0)
lseek(*fd, 0, SEEK_SET);
#endif
off_s = 0;
size = archive_entry_size(entry);
while (off_s < size) {
off_s = lseek(*fd, off_s, SEEK_DATA);
if (off_s == (off_t)-1) {
if (errno == ENXIO) {
/* no more hole */
if (archive_entry_sparse_count(entry) == 0) {
/* Potentially a fully-sparse file. */
check_fully_sparse = 1;
}
break;
}
archive_set_error(&a->archive, errno,
"lseek(SEEK_HOLE) failed");
exit_sts = ARCHIVE_FAILED;
goto exit_setup_sparse;
}
off_e = lseek(*fd, off_s, SEEK_HOLE);
if (off_e == (off_t)-1) {
if (errno == ENXIO) {
off_e = lseek(*fd, 0, SEEK_END);
if (off_e != (off_t)-1)
break;/* no more data */
}
archive_set_error(&a->archive, errno,
"lseek(SEEK_DATA) failed");
exit_sts = ARCHIVE_FAILED;
goto exit_setup_sparse;
}
if (off_s == 0 && off_e == size)
break;/* This is not sparse. */
archive_entry_sparse_add_entry(entry, off_s,
off_e - off_s);
off_s = off_e;
}
if (check_fully_sparse) {
if (lseek(*fd, 0, SEEK_HOLE) == 0 &&
lseek(*fd, 0, SEEK_END) == size) {
/* Fully sparse file; insert a zero-length "data" entry */
archive_entry_sparse_add_entry(entry, 0, 0);
}
}
exit_setup_sparse:
lseek(*fd, initial_off, SEEK_SET);
return (exit_sts);
}
#elif !defined(HAVE_LINUX_FIEMAP_H)
/*
* Generic (stub) sparse support.
*/
static int
setup_sparse(struct archive_read_disk *a,
struct archive_entry *entry, int *fd)
{
(void)a; /* UNUSED */
(void)entry; /* UNUSED */
(void)fd; /* UNUSED */
return (ARCHIVE_OK);
}
#endif
#endif /* !defined(_WIN32) || defined(__CYGWIN__) */