/*-
* Copyright (c) 2003-2009 Tim Kientzle
* Copyright (c) 2010 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_read_disk_entry_from_file.c 201084 2009-12-28 02:14:09Z kientzle $");
/* This is the tree-walking code for POSIX systems. */
#if !defined(_WIN32) || defined(__CYGWIN__)
#ifdef HAVE_SYS_TYPES_H
/* Mac OSX requires sys/types.h before sys/acl.h. */
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_ACL_H
#include <sys/acl.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
#ifdef HAVE_SYS_XATTR_H
#include <sys/xattr.h>
#endif
#ifdef HAVE_SYS_EA_H
#include <sys/ea.h>
#endif
#ifdef HAVE_ACL_LIBACL_H
#include <acl/libacl.h>
#endif
#ifdef HAVE_ATTR_XATTR_H
#include <attr/xattr.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"
/*
* Linux and FreeBSD plug this obvious hole in POSIX.1e in
* different ways.
*/
#if HAVE_ACL_GET_PERM
#define ACL_GET_PERM acl_get_perm
#elif HAVE_ACL_GET_PERM_NP
#define ACL_GET_PERM acl_get_perm_np
#endif
static int setup_acls_posix1e(struct archive_read_disk *,
struct archive_entry *, int fd);
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);
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 (st->st_flags != 0)
archive_entry_set_fflags(entry, st->st_flags, 0);
#endif
#if 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 ((S_ISREG(st->st_mode) || S_ISDIR(st->st_mode))) {
if (fd < 0)
fd = open(path, O_RDONLY | O_NONBLOCK);
if (fd >= 0) {
unsigned long stflags;
int r = ioctl(fd, EXT2_IOC_GETFLAGS, &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);
}
#ifdef HAVE_READLINKAT
if (a->entry_wd_fd >= 0)
lnklen = readlinkat(a->entry_wd_fd, path,
linkbuffer, linkbuffer_len);
else
#endif /* HAVE_READLINKAT */
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 = setup_acls_posix1e(a, entry, fd);
r1 = setup_xattrs(a, entry, fd);
if (r1 < r)
r = r1;
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;
int have_attrs;
const char *name, *tempdir, *tempfile = NULL;
name = archive_entry_sourcepath(entry);
if (name == NULL)
name = archive_entry_pathname(entry);
if (name == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Can't open file to read extended attributes: No name");
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;
tempfile = tempnam(tempdir, "tar.md.");
/* 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, 0, copyfile_flags | COPYFILE_PACK)) {
archive_set_error(&a->archive, errno,
"Could not pack extended attributes");
ret = ARCHIVE_WARN;
goto cleanup;
}
tempfd = open(tempfile, O_RDONLY);
if (tempfd < 0) {
archive_set_error(&a->archive, errno,
"Could not open extended attribute file");
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);
if (tempfile != NULL)
unlink(tempfile);
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
#ifdef HAVE_POSIX_ACL
static void setup_acl_posix1e(struct archive_read_disk *a,
struct archive_entry *entry, acl_t acl, int archive_entry_acl_type);
static int
setup_acls_posix1e(struct archive_read_disk *a,
struct archive_entry *entry, int fd)
{
const char *accpath;
acl_t acl;
accpath = archive_entry_sourcepath(entry);
if (accpath == NULL)
accpath = archive_entry_pathname(entry);
archive_entry_acl_clear(entry);
/* Retrieve access ACL from file. */
if (fd >= 0)
acl = acl_get_fd(fd);
#if HAVE_ACL_GET_LINK_NP
else if (!a->follow_symlinks)
acl = acl_get_link_np(accpath, ACL_TYPE_ACCESS);
#else
else if ((!a->follow_symlinks)
&& (archive_entry_filetype(entry) == AE_IFLNK))
/* We can't get the ACL of a symlink, so we assume it can't
have one. */
acl = NULL;
#endif
else
acl = acl_get_file(accpath, ACL_TYPE_ACCESS);
if (acl != NULL) {
setup_acl_posix1e(a, entry, acl,
ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
acl_free(acl);
}
/* Only directories can have default ACLs. */
if (S_ISDIR(archive_entry_mode(entry))) {
acl = acl_get_file(accpath, ACL_TYPE_DEFAULT);
if (acl != NULL) {
setup_acl_posix1e(a, entry, acl,
ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
acl_free(acl);
}
}
return (ARCHIVE_OK);
}
/*
* Translate POSIX.1e ACL into libarchive internal structure.
*/
static void
setup_acl_posix1e(struct archive_read_disk *a,
struct archive_entry *entry, acl_t acl, int archive_entry_acl_type)
{
acl_tag_t acl_tag;
acl_entry_t acl_entry;
acl_permset_t acl_permset;
int s, ae_id, ae_tag, ae_perm;
const char *ae_name;
s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry);
while (s == 1) {
ae_id = -1;
ae_name = NULL;
acl_get_tag_type(acl_entry, &acl_tag);
if (acl_tag == ACL_USER) {
ae_id = (int)*(uid_t *)acl_get_qualifier(acl_entry);
ae_name = archive_read_disk_uname(&a->archive, ae_id);
ae_tag = ARCHIVE_ENTRY_ACL_USER;
} else if (acl_tag == ACL_GROUP) {
ae_id = (int)*(gid_t *)acl_get_qualifier(acl_entry);
ae_name = archive_read_disk_gname(&a->archive, ae_id);
ae_tag = ARCHIVE_ENTRY_ACL_GROUP;
} else if (acl_tag == ACL_MASK) {
ae_tag = ARCHIVE_ENTRY_ACL_MASK;
} else if (acl_tag == ACL_USER_OBJ) {
ae_tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
} else if (acl_tag == ACL_GROUP_OBJ) {
ae_tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
} else if (acl_tag == ACL_OTHER) {
ae_tag = ARCHIVE_ENTRY_ACL_OTHER;
} else {
/* Skip types that libarchive can't support. */
continue;
}
acl_get_permset(acl_entry, &acl_permset);
ae_perm = 0;
/*
* acl_get_perm() is spelled differently on different
* platforms; see above.
*/
if (ACL_GET_PERM(acl_permset, ACL_EXECUTE))
ae_perm |= ARCHIVE_ENTRY_ACL_EXECUTE;
if (ACL_GET_PERM(acl_permset, ACL_READ))
ae_perm |= ARCHIVE_ENTRY_ACL_READ;
if (ACL_GET_PERM(acl_permset, ACL_WRITE))
ae_perm |= ARCHIVE_ENTRY_ACL_WRITE;
archive_entry_acl_add_entry(entry,
archive_entry_acl_type, ae_perm, ae_tag,
ae_id, ae_name);
s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
}
}
#else
static int
setup_acls_posix1e(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 (HAVE_FGETXATTR && HAVE_FLISTXATTR && HAVE_LISTXATTR && \
HAVE_LLISTXATTR && HAVE_GETXATTR && HAVE_LGETXATTR) || \
(HAVE_FGETEA && HAVE_FLISTEA && HAVE_LISTEA)
/*
* Linux 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)
{
ssize_t size;
void *value = NULL;
const char *accpath;
accpath = archive_entry_sourcepath(entry);
if (accpath == NULL)
accpath = archive_entry_pathname(entry);
#if HAVE_FGETXATTR
if (fd >= 0)
size = fgetxattr(fd, name, NULL, 0);
else if (!a->follow_symlinks)
size = lgetxattr(accpath, name, NULL, 0);
else
size = getxattr(accpath, name, NULL, 0);
#elif HAVE_FGETEA
if (fd >= 0)
size = fgetea(fd, name, NULL, 0);
else if (!a->follow_symlinks)
size = lgetea(accpath, name, NULL, 0);
else
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 HAVE_FGETXATTR
if (fd >= 0)
size = fgetxattr(fd, name, value, size);
else if (!a->follow_symlinks)
size = lgetxattr(accpath, name, value, size);
else
size = getxattr(accpath, name, value, size);
#elif HAVE_FGETEA
if (fd >= 0)
size = fgetea(fd, name, value, size);
else if (!a->follow_symlinks)
size = lgetea(accpath, name, value, size);
else
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 = archive_entry_sourcepath(entry);
if (path == NULL)
path = archive_entry_pathname(entry);
#if HAVE_FLISTXATTR
if (fd >= 0)
list_size = flistxattr(fd, NULL, 0);
else if (!a->follow_symlinks)
list_size = llistxattr(path, NULL, 0);
else
list_size = listxattr(path, NULL, 0);
#elif HAVE_FLISTEA
if (fd >= 0)
list_size = flistea(fd, NULL, 0);
else if (!a->follow_symlinks)
list_size = llistea(path, NULL, 0);
else
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 HAVE_FLISTXATTR
if (fd >= 0)
list_size = flistxattr(fd, list, list_size);
else if (!a->follow_symlinks)
list_size = llistxattr(path, list, list_size);
else
list_size = listxattr(path, list, list_size);
#elif HAVE_FLISTEA
if (fd >= 0)
list_size = flistea(fd, list, list_size);
else if (!a->follow_symlinks)
list_size = llistea(path, list, list_size);
else
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 (strncmp(p, "system.", 7) == 0 ||
strncmp(p, "xfsroot.", 8) == 0)
continue;
setup_xattr(a, entry, p, fd);
}
free(list);
return (ARCHIVE_OK);
}
#elif HAVE_EXTATTR_GET_FILE && HAVE_EXTATTR_LIST_FILE && \
HAVE_DECL_EXTATTR_NAMESPACE_USER
/*
* 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);
static int
setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
int namespace, const char *name, const char *fullname, int fd)
{
ssize_t size;
void *value = NULL;
const char *accpath;
accpath = archive_entry_sourcepath(entry);
if (accpath == NULL)
accpath = archive_entry_pathname(entry);
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) {
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 = archive_entry_sourcepath(entry);
if (path == NULL)
path = archive_entry_pathname(entry);
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);
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 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(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;
int initial_fd = fd;
int exit_sts = ARCHIVE_OK;
if (archive_entry_filetype(entry) != AE_IFREG
|| archive_entry_size(entry) <= 0
|| archive_entry_hardlink(entry) != NULL)
return (ARCHIVE_OK);
if (fd < 0) {
const char *path;
path = archive_entry_sourcepath(entry);
if (path == NULL)
path = archive_entry_pathname(entry);
fd = open(path, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
archive_set_error(&a->archive, errno,
"Can't open `%s'", path);
return (ARCHIVE_FAILED);
}
}
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 (;;) {
int i, r;
r = ioctl(fd, FS_IOC_FIEMAP, fm);
if (r < 0) {
/* When errno is ENOTTY, it is better we should
* return ARCHIVE_OK because an earlier version
*(<2.6.28) cannot perfom FS_IOC_FIEMAP.
* We should also check if errno is EOPNOTSUPP,
* it means "Operation not supported". */
if (errno != ENOTTY && errno != EOPNOTSUPP) {
archive_set_error(&a->archive, errno,
"FIEMAP failed");
exit_sts = ARCHIVE_FAILED;
}
goto exit_setup_sparse;
}
if (fm->fm_mapped_extents == 0)
break;
fe = fm->fm_extents;
for (i = 0; i < 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 > 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:
if (initial_fd != fd)
close(fd);
return (exit_sts);
}
#elif defined(SEEK_HOLE) && defined(SEEK_DATA) && defined(_PC_MIN_HOLE_SIZE)
/*
* FreeBSD and Solaris sparse interface.
*/
static int
setup_sparse(struct archive_read_disk *a,
struct archive_entry *entry, int fd)
{
int64_t size;
int initial_fd = fd;
off_t initial_off; /* FreeBSD/Solaris only, so off_t okay here */
off_t off_s, off_e; /* FreeBSD/Solaris only, so off_t okay here */
int exit_sts = ARCHIVE_OK;
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) {
if (fpathconf(fd, _PC_MIN_HOLE_SIZE) <= 0)
return (ARCHIVE_OK);
initial_off = lseek(fd, 0, SEEK_CUR);
if (initial_off != 0)
lseek(fd, 0, SEEK_SET);
} else {
const char *path;
path = archive_entry_sourcepath(entry);
if (path == NULL)
path = archive_entry_pathname(entry);
if (pathconf(path, _PC_MIN_HOLE_SIZE) <= 0)
return (ARCHIVE_OK);
fd = open(path, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
archive_set_error(&a->archive, errno,
"Can't open `%s'", path);
return (ARCHIVE_FAILED);
}
initial_off = 0;
}
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)
break;/* no more hole */
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_s == (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 spase. */
archive_entry_sparse_add_entry(entry, off_s,
off_e - off_s);
off_s = off_e;
}
exit_setup_sparse:
if (initial_fd != fd)
close(fd);
else
lseek(fd, initial_off, SEEK_SET);
return (exit_sts);
}
#else
/*
* 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__) */