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freebsd/lib/libarchive/archive_read_disk_entry_from_file.c

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/*-
* Copyright (c) 2003-2009 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_SYS_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_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_ACL_LIBACL_H
#include <acl/libacl.h>
#endif
#ifdef HAVE_ATTR_XATTR_H
#include <attr/xattr.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.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_xattrs(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;
path = archive_entry_sourcepath(entry);
if (path == NULL)
path = archive_entry_pathname(entry);
#ifdef 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(pathname, 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 (st == NULL) {
#if HAVE_FSTAT
if (fd >= 0) {
if (fstat(fd, &s) != 0)
return (ARCHIVE_FATAL);
} else
#endif
#if HAVE_LSTAT
if (!a->follow_symlinks) {
if (lstat(path, &s) != 0)
return (ARCHIVE_FATAL);
} else
#endif
if (stat(path, &s) != 0)
return (ARCHIVE_FATAL);
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
#ifdef HAVE_READLINK
if (S_ISLNK(st->st_mode)) {
char linkbuffer[PATH_MAX + 1];
int lnklen = readlink(path, linkbuffer, PATH_MAX);
if (lnklen < 0) {
archive_set_error(&a->archive, errno,
"Couldn't read link data");
return (ARCHIVE_WARN);
}
linkbuffer[lnklen] = 0;
archive_entry_set_symlink(entry, linkbuffer);
}
#endif
r = setup_acls_posix1e(a, entry, fd);
r1 = setup_xattrs(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);
}
#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);
#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_LISTXATTR && HAVE_LLISTXATTR && HAVE_GETXATTR && HAVE_LGETXATTR
/*
* Linux 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;
(void)fd; /* UNUSED */
accpath = archive_entry_sourcepath(entry);
if (accpath == NULL)
accpath = archive_entry_pathname(entry);
if (!a->follow_symlinks)
size = lgetxattr(accpath, name, NULL, 0);
else
size = getxattr(accpath, 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 (!a->follow_symlinks)
size = lgetxattr(accpath, name, value, size);
else
size = getxattr(accpath, 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, 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 (!a->follow_symlinks)
list_size = llistxattr(path, NULL, 0);
else
list_size = listxattr(path, NULL, 0);
if (list_size == -1) {
if (errno == ENOTSUP)
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 (!a->follow_symlinks)
list_size = llistxattr(path, list, list_size);
else
list_size = listxattr(path, list, list_size);
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
/*
* 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.
*/
int
setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
int namespace, const char *name, const char *fullname, int fd);
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;
(void)fd; /* UNUSED */
accpath = archive_entry_sourcepath(entry);
if (accpath == NULL)
accpath = archive_entry_pathname(entry);
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 (!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 (!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 (!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
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