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C.tar
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C/ 0000775 0001750 0001750 00000000000 13572003455 011076 5 ustar goddino goddino C/copyfile.c 0000664 0001750 0001750 00000211200 13572003455 013050 0 ustar goddino goddino /*
* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <err.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/acl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <syslog.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/xattr.h>
#include <sys/syscall.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/acl.h>
#include <libkern/OSByteOrder.h>
#include <membership.h>
#include <TargetConditionals.h>
#if !TARGET_OS_EMBEDDED
#include <quarantine.h>
#define XATTR_QUARANTINE_NAME qtn_xattr_name
#else /* TARGET_OS_EMBEDDED */
#define qtn_file_t void *
#define QTN_SERIALIZED_DATA_MAX 0
static void * qtn_file_alloc(void) { return NULL; }
static int qtn_file_init_with_fd(void *x, int y) { return -1; }
static void qtn_file_free(void *x) { return; }
static int qtn_file_apply_to_fd(void *x, int y) { return -1; }
static char *qtn_error(int x) { return NULL; }
static int qtn_file_to_data(void *x, char *y, size_t z) { return -1; }
static void *qtn_file_clone(void *x) { return NULL; }
#define XATTR_QUARANTINE_NAME "figgledidiggledy"
#endif /* TARGET_OS_EMBEDDED */
#include "copyfile.h"
/*
* The state structure keeps track of
* the source filename, the destination filename, their
* associated file-descriptors, the stat infomration for the
* source file, the security information for the source file,
* the flags passed in for the copy, a pointer to place statistics
* (not currently implemented), debug flags, and a pointer to callbacks
* (not currently implemented).
*/
struct _copyfile_state
{
char *src;
char *dst;
int src_fd;
int dst_fd;
struct stat sb;
filesec_t fsec;
copyfile_flags_t flags;
void *stats;
uint32_t debug;
void *callbacks;
qtn_file_t qinfo; /* Quarantine information -- probably NULL */
};
/*
* Internally, the process is broken into a series of
* private functions.
*/
static int copyfile_open (copyfile_state_t);
static int copyfile_close (copyfile_state_t);
static int copyfile_data (copyfile_state_t);
static int copyfile_stat (copyfile_state_t);
static int copyfile_security (copyfile_state_t);
static int copyfile_xattr (copyfile_state_t);
static int copyfile_pack (copyfile_state_t);
static int copyfile_unpack (copyfile_state_t);
static copyfile_flags_t copyfile_check (copyfile_state_t);
static filesec_t copyfile_fix_perms(copyfile_state_t, filesec_t *);
static int copyfile_preamble(copyfile_state_t *s, copyfile_flags_t flags);
static int copyfile_internal(copyfile_state_t state, copyfile_flags_t flags);
static int copyfile_unset_posix_fsec(filesec_t);
static int copyfile_quarantine(copyfile_state_t);
#define COPYFILE_DEBUG (1<<31)
#define COPYFILE_DEBUG_VAR "COPYFILE_DEBUG"
#ifndef _COPYFILE_TEST
# define copyfile_warn(str, ...) syslog(LOG_WARNING, str ": %m", ## __VA_ARGS__)
# define copyfile_debug(d, str, ...) \
do { \
if (s && (d <= s->debug)) {\
syslog(LOG_DEBUG, "%s:%d:%s() " str "\n", __FILE__, __LINE__ , __FUNCTION__, ## __VA_ARGS__); \
} \
} while (0)
#else
#define copyfile_warn(str, ...) \
fprintf(stderr, "%s:%d:%s() " str ": %s\n", __FILE__, __LINE__ , __FUNCTION__, ## __VA_ARGS__, (errno) ? strerror(errno) : "")
# define copyfile_debug(d, str, ...) \
do { \
if (s && (d <= s->debug)) {\
fprintf(stderr, "%s:%d:%s() " str "\n", __FILE__, __LINE__ , __FUNCTION__, ## __VA_ARGS__); \
} \
} while(0)
#endif
static int copyfile_quarantine(copyfile_state_t s)
{
int rv = 0;
if (s->qinfo == NULL)
{
int error;
s->qinfo = qtn_file_alloc();
if (s->qinfo == NULL)
{
rv = -1;
goto done;
}
if ((error = qtn_file_init_with_fd(s->qinfo, s->src_fd)) != 0)
{
qtn_file_free(s->qinfo);
s->qinfo = NULL;
errno = error;
rv = -1;
goto done;
}
}
done:
return rv;
}
/*
* fcopyfile() is used to copy a source file descriptor to a destination file
* descriptor. This allows an application to figure out how it wants to open
* the files (doing various security checks, perhaps), and then just pass in
* the file descriptors.
*/
int fcopyfile(int src_fd, int dst_fd, copyfile_state_t state, copyfile_flags_t flags)
{
int ret = 0;
copyfile_state_t s = state;
struct stat dst_sb;
if (src_fd < 0 || dst_fd < 0)
{
errno = EINVAL;
return -1;
}
if (copyfile_preamble(&s, flags) < 0)
return -1;
copyfile_debug(2, "set src_fd <- %d", src_fd);
if (s->src_fd == -2 && src_fd > -1)
{
s->src_fd = src_fd;
if (fstatx_np(s->src_fd, &s->sb, s->fsec) != 0)
{
if (errno == ENOTSUP)
fstat(s->src_fd, &s->sb);
else
{
copyfile_warn("fstatx_np on src fd %d", s->src_fd);
return -1;
}
}
}
/* prevent copying on unsupported types */
switch (s->sb.st_mode & S_IFMT)
{
case S_IFLNK:
case S_IFDIR:
case S_IFREG:
break;
default:
errno = ENOTSUP;
return -1;
}
copyfile_debug(2, "set dst_fd <- %d", dst_fd);
if (s->dst_fd == -2 && dst_fd > -1)
s->dst_fd = dst_fd;
(void)fstat(s->dst_fd, &dst_sb);
(void)fchmod(s->dst_fd, (dst_sb.st_mode & ~S_IFMT) | (S_IRUSR | S_IWUSR));
(void)copyfile_quarantine(s);
ret = copyfile_internal(s, flags);
if (ret >= 0 && !(s->flags & COPYFILE_STAT))
{
(void)fchmod(s->dst_fd, dst_sb.st_mode & ~S_IFMT);
}
if (state == NULL)
copyfile_state_free(s);
return ret;
}
/*
* the original copyfile() routine; this copies a source file to a destination
* file. Note that because we need to set the names in the state variable, this
* is not just the same as opening the two files, and then calling fcopyfile().
* Oh, if only life were that simple!
*/
int copyfile(const char *src, const char *dst, copyfile_state_t state, copyfile_flags_t flags)
{
int ret = 0;
copyfile_state_t s = state;
filesec_t original_fsec = NULL;
filesec_t permissive_fsec = NULL;
struct stat sb;
if (src == NULL && dst == NULL)
{
errno = EINVAL;
return -1;
}
if (copyfile_preamble(&s, flags) < 0)
{
return -1;
}
/*
* This macro is... well, it's not the worst thing you can do with cpp, not
* by a long shot. Essentially, we are setting the filename (src or dst)
* in the state structure; since the structure may not have been cleared out
* before being used again, we do some of the cleanup here: if the given
* filename (e.g., src) is set, and state->src is not equal to that, then
* we need to check to see if the file descriptor had been opened, and if so,
* close it. After that, we set state->src to be a copy of the given filename,
* releasing the old copy if necessary.
*/
#define COPYFILE_SET_FNAME(NAME, S) \
do { \
if (NAME != NULL) { \
if (S->NAME != NULL && strncmp(NAME, S->NAME, MAXPATHLEN)) { \
copyfile_debug(2, "replacing string %s (%s) -> (%s)", #NAME, NAME, S->NAME);\
if (S->NAME##_fd != -2 && S->NAME##_fd > -1) { \
copyfile_debug(4, "closing %s fd: %d", #NAME, S->NAME##_fd); \
close(S->NAME##_fd); \
S->NAME##_fd = -2; \
} \
} \
if (S->NAME) { \
free(S->NAME); \
S->NAME = NULL; \
} \
if ((S->NAME = strdup(NAME)) == NULL) \
return -1; \
} \
} while (0)
COPYFILE_SET_FNAME(src, s);
COPYFILE_SET_FNAME(dst, s);
/*
* Get a copy of the source file's security settings
*/
if ((original_fsec = filesec_init()) == NULL)
goto error_exit;
if(statx_np(s->dst, &sb, original_fsec) == 0)
{
/*
* copyfile_fix_perms() will make a copy of the permission set,
* and insert at the beginning an ACE that ensures we can write
* to the file and set attributes.
*/
if((permissive_fsec = copyfile_fix_perms(s, &original_fsec)) != NULL)
{
/*
* Set the permissions for the destination to our copy.
* We should get ENOTSUP from any filesystem that simply
* doesn't support it.
*/
if (chmodx_np(s->dst, permissive_fsec) < 0 && errno != ENOTSUP)
{
copyfile_warn("setting security information");
filesec_free(permissive_fsec);
permissive_fsec = NULL;
}
}
}
/*
* If COPYFILE_CHECK is set in flags, then all we are going to do
* is see what kinds of things WOULD have been copied (see
* copyfile_check() below). We return that value.
*/
if (COPYFILE_CHECK & flags)
{
ret = copyfile_check(s);
goto exit;
} else if ((ret = copyfile_open(s)) < 0)
goto error_exit;
ret = copyfile_internal(s, flags);
/* If we haven't reset the file security information
* (COPYFILE_SECURITY is not set in flags)
* restore back the permissions the file had originally
*
* One of the reasons this seems so complicated is that
* it is partially at odds with copyfile_security().
*
* Simplisticly, we are simply trying to make sure we
* only copy what was requested, and that we don't stomp
* on what wasn't requsted.
*/
if (permissive_fsec && (s->flags & COPYFILE_SECURITY) != COPYFILE_SECURITY) {
if (s->flags & COPYFILE_ACL) {
/* Just need to reset the BSD information -- mode, owner, group */
(void)fchown(s->dst_fd, sb.st_uid, sb.st_gid);
(void)fchmod(s->dst_fd, sb.st_mode);
} else {
/*
* flags is either COPYFILE_STAT, or neither; if it's
* neither, then we restore both ACL and POSIX permissions;
* if it's STAT, however, then we only want to restore the
* ACL (which may be empty). We do that by removing the
* POSIX information from the filesec object.
*/
if (s->flags & COPYFILE_STAT) {
copyfile_unset_posix_fsec(original_fsec);
}
if (fchmodx_np(s->dst_fd, original_fsec) < 0 && errno != ENOTSUP)
copyfile_warn("restoring security information");
}
}
exit:
if (state == NULL)
copyfile_state_free(s);
if (original_fsec)
filesec_free(original_fsec);
if (permissive_fsec)
filesec_free(permissive_fsec);
return ret;
error_exit:
ret = -1;
goto exit;
}
/*
* Shared prelude to the {f,}copyfile(). This initializes the
* state variable, if necessary, and also checks for both debugging
* and disabling environment variables.
*/
static int copyfile_preamble(copyfile_state_t *state, copyfile_flags_t flags)
{
copyfile_state_t s;
if (*state == NULL)
{
if ((*state = copyfile_state_alloc()) == NULL)
return -1;
}
s = *state;
if (COPYFILE_DEBUG & flags)
{
char *e;
if ((e = getenv(COPYFILE_DEBUG_VAR)))
{
errno = 0;
s->debug = (uint32_t)strtol(e, NULL, 0);
/* clamp s->debug to 1 if the environment variable is not parsable */
if (s->debug == 0 && errno != 0)
s->debug = 1;
}
copyfile_debug(2, "debug value set to: %d", s->debug);
}
#if 0
/* Temporarily disabled */
if (getenv(COPYFILE_DISABLE_VAR) != NULL)
{
copyfile_debug(1, "copyfile disabled");
return 2;
}
#endif
copyfile_debug(2, "setting flags: %d", s->flags);
s->flags = flags;
return 0;
}
/*
* The guts of {f,}copyfile().
* This looks through the flags in a particular order, and calls the
* associated functions.
*/
static int copyfile_internal(copyfile_state_t s, copyfile_flags_t flags)
{
int ret = 0;
if (s->dst_fd < 0 || s->src_fd < 0)
{
copyfile_debug(1, "file descriptors not open (src: %d, dst: %d)",
s->src_fd, s->dst_fd);
errno = EINVAL;
return -1;
}
/*
* COPYFILE_PACK causes us to create an Apple Double version of the
* source file, and puts it into the destination file. See
* copyfile_pack() below for all the gory details.
*/
if (COPYFILE_PACK & flags)
{
if ((ret = copyfile_pack(s)) < 0)
{
unlink(s->dst);
goto exit;
}
goto exit;
}
/*
* COPYFILE_UNPACK is the undoing of COPYFILE_PACK, obviously.
* The goal there is to take an Apple Double file, and turn it
* into a normal file (with data fork, resource fork, modes,
* extended attributes, ACLs, etc.).
*/
if (COPYFILE_UNPACK & flags)
{
if ((ret = copyfile_unpack(s)) < 0)
goto error_exit;
goto exit;
}
/*
* If we have quarantine info set, we attempt
* to apply it to dst_fd. We don't care if
* it fails, not yet anyway.
*/
if (s->qinfo)
(void)qtn_file_apply_to_fd(s->qinfo, s->dst_fd);
/*
* COPYFILE_XATTR tells us to copy the extended attributes;
* this is seperate from the extended security (aka ACLs),
* however. If we succeed in this, we continue to the next
* stage; if we fail, we return with an error value. Note
* that we fail if the errno is ENOTSUP, but we don't print
* a warning in that case.
*/
if (COPYFILE_XATTR & flags)
{
if ((ret = copyfile_xattr(s)) < 0)
{
if (errno != ENOTSUP)
copyfile_warn("error processing extended attributes");
goto exit;
}
}
/*
* Simialr to above, this tells us whether or not to copy
* the non-meta data portion of the file. We attempt to
* remove (via unlink) the destination file if we fail.
*/
if (COPYFILE_DATA & flags)
{
if ((ret = copyfile_data(s)) < 0)
{
copyfile_warn("error processing data");
if (s->dst && unlink(s->dst))
copyfile_warn("%s: remove", s->src);
goto exit;
}
}
/*
* COPYFILE_SECURITY requests that we copy the security, both
* extended and mundane (that is, ACLs and POSIX).
*/
if (COPYFILE_SECURITY & flags)
{
if ((ret = copyfile_security(s)) < 0)
{
copyfile_warn("error processing security information");
goto exit;
}
}
if (COPYFILE_STAT & flags)
{
if ((ret = copyfile_stat(s)) < 0)
{
copyfile_warn("error processing POSIX information");
goto exit;
}
}
exit:
return ret;
error_exit:
ret = -1;
goto exit;
}
/*
* A publicly-visible routine, copyfile_state_alloc() sets up the state variable.
*/
copyfile_state_t copyfile_state_alloc(void)
{
copyfile_state_t s = (copyfile_state_t) calloc(1, sizeof(struct _copyfile_state));
if (s != NULL)
{
s->src_fd = -2;
s->dst_fd = -2;
s->fsec = filesec_init();
} else
errno = ENOMEM;
return s;
}
/*
* copyfile_state_free() returns the memory allocated to the state structure.
* It also closes the file descriptors, if they've been opened.
*/
int copyfile_state_free(copyfile_state_t s)
{
if (s != NULL)
{
if (s->fsec)
filesec_free(s->fsec);
if (s->qinfo)
qtn_file_free(s->qinfo);
if (copyfile_close(s) < 0)
{
copyfile_warn("error closing files");
return -1;
}
if (s->dst)
free(s->dst);
if (s->src)
free(s->src);
free(s);
}
return 0;
}
/*
* Should we worry if we can't close the source? NFS says we
* should, but it's pretty late for us at this point.
*/
static int copyfile_close(copyfile_state_t s)
{
if (s->src && s->src_fd >= 0)
close(s->src_fd);
if (s->dst && s->dst_fd >= 0) {
if (close(s->dst_fd))
return -1;
}
return 0;
}
/*
* The purpose of this function is to set up a set of permissions
* (ACL and traditional) that lets us write to the file. In the
* case of ACLs, we do this by putting in a first entry that lets
* us write data, attributes, and extended attributes. In the case
* of traditional permissions, we set the S_IWUSR (user-write)
* bit.
*/
static filesec_t copyfile_fix_perms(copyfile_state_t s __unused, filesec_t *fsec)
{
filesec_t ret_fsec = NULL;
mode_t mode;
acl_t acl = NULL;
if ((ret_fsec = filesec_dup(*fsec)) == NULL)
goto error_exit;
if (filesec_get_property(ret_fsec, FILESEC_ACL, &acl) == 0)
{
acl_entry_t entry;
acl_permset_t permset;
uuid_t qual;
if (mbr_uid_to_uuid(getuid(), qual) != 0)
goto error_exit;
/*
* First, we create an entry, and give it the special name
* of ACL_FIRST_ENTRY, thus guaranteeing it will be first.
* After that, we clear out all the permissions in it, and
* add three permissions: WRITE_DATA, WRITE_ATTRIBUTES, and
* WRITE_EXTATTRIBUTES. We put these into an ACE that allows
* the functionality, and put this into the ACL.
*/
if (acl_create_entry_np(&acl, &entry, ACL_FIRST_ENTRY) == -1)
goto error_exit;
if (acl_get_permset(entry, &permset) == -1)
goto error_exit;
if (acl_clear_perms(permset) == -1)
goto error_exit;
if (acl_add_perm(permset, ACL_WRITE_DATA) == -1)
goto error_exit;
if (acl_add_perm(permset, ACL_WRITE_ATTRIBUTES) == -1)
goto error_exit;
if (acl_add_perm(permset, ACL_WRITE_EXTATTRIBUTES) == -1)
goto error_exit;
if (acl_set_tag_type(entry, ACL_EXTENDED_ALLOW) == -1)
goto error_exit;
if(acl_set_permset(entry, permset) == -1)
goto error_exit;
if(acl_set_qualifier(entry, qual) == -1)
goto error_exit;
if (filesec_set_property(ret_fsec, FILESEC_ACL, &acl) != 0)
goto error_exit;
}
/*
* This is for the normal, mundane, POSIX permission model.
* We make sure that we can write to the file.
*/
if (filesec_get_property(ret_fsec, FILESEC_MODE, &mode) == 0)
{
if ((mode & (S_IWUSR | S_IRUSR)) != (S_IWUSR | S_IRUSR))
{
mode |= S_IWUSR|S_IRUSR;
if (filesec_set_property(ret_fsec, FILESEC_MODE, &mode) != 0)
goto error_exit;
}
}
exit:
if (acl)
acl_free(acl);
return ret_fsec;
error_exit:
if (ret_fsec)
{
filesec_free(ret_fsec);
ret_fsec = NULL;
}
goto exit;
}
/*
* Used to clear out the BSD/POSIX security information from
* a filesec
*/
static int
copyfile_unset_posix_fsec(filesec_t fsec)
{
(void)filesec_set_property(fsec, FILESEC_OWNER, _FILESEC_UNSET_PROPERTY);
(void)filesec_set_property(fsec, FILESEC_GROUP, _FILESEC_UNSET_PROPERTY);
(void)filesec_set_property(fsec, FILESEC_MODE, _FILESEC_UNSET_PROPERTY);
return 0;
}
/*
* Used to remove acl information from a filesec_t
* Unsetting the acl alone in Tiger was insufficient
*/
static int copyfile_unset_acl(copyfile_state_t s)
{
int ret = 0;
if (filesec_set_property(s->fsec, FILESEC_ACL, NULL) == -1)
{
copyfile_debug(5, "unsetting acl attribute on %s", s->dst);
++ret;
}
if (filesec_set_property(s->fsec, FILESEC_UUID, NULL) == -1)
{
copyfile_debug(5, "unsetting uuid attribute on %s", s->dst);
++ret;
}
if (filesec_set_property(s->fsec, FILESEC_GRPUUID, NULL) == -1)
{
copyfile_debug(5, "unsetting group uuid attribute on %s", s->dst);
++ret;
}
return ret;
}
/*
* copyfile_open() does what one expects: it opens up the files
* given in the state structure, if they're not already open.
* It also does some type validation, to ensure that we only
* handle file types we know about.
*/
static int copyfile_open(copyfile_state_t s)
{
int oflags = O_EXCL | O_CREAT | O_WRONLY;
int islnk = 0, isdir = 0;
int osrc = 0, dsrc = 0;
if (s->src && s->src_fd == -2)
{
if ((COPYFILE_NOFOLLOW_SRC & s->flags ? lstatx_np : statx_np)
(s->src, &s->sb, s->fsec))
{
copyfile_warn("stat on %s", s->src);
return -1;
}
/* prevent copying on unsupported types */
switch (s->sb.st_mode & S_IFMT)
{
case S_IFLNK:
islnk = 1;
if (s->sb.st_size > (off_t)SIZE_T_MAX) {
errno = ENOMEM; /* too big for us to copy */
return -1;
}
osrc = O_SYMLINK;
break;
case S_IFDIR:
isdir = 1;
break;
case S_IFREG:
break;
default:
errno = ENOTSUP;
return -1;
}
/*
* If we're packing, then we are actually
* creating a file, no matter what the source
* was.
*/
if (s->flags & COPYFILE_PACK) {
/*
* O_SYMLINK and O_NOFOLLOW are not compatible options:
* if the file is a symlink, and O_NOFOLLOW is specified,
* open will return ELOOP, whether or not O_SYMLINK is set.
* However, we know whether or not it was a symlink from
* the stat above (although there is a potentiaal for a race
* condition here, but it will err on the side of returning
* ELOOP from open).
*/
if (!islnk)
osrc = (s->flags & COPYFILE_NOFOLLOW_SRC) ? O_NOFOLLOW : 0;
isdir = islnk = 0;
}
if ((s->src_fd = open(s->src, O_RDONLY | osrc , 0)) < 0)
{
copyfile_warn("open on %s", s->src);
return -1;
} else
copyfile_debug(2, "open successful on source (%s)", s->src);
(void)copyfile_quarantine(s);
}
if (s->dst && s->dst_fd == -2)
{
/*
* COPYFILE_UNLINK tells us to try removing the destination
* before we create it. We don't care if the file doesn't
* exist, so we ignore ENOENT.
*/
if (COPYFILE_UNLINK & s->flags)
{
if (remove(s->dst) < 0 && errno != ENOENT)
{
copyfile_warn("%s: remove", s->dst);
return -1;
}
}
if (s->flags & COPYFILE_NOFOLLOW_DST)
dsrc = O_NOFOLLOW;
if (islnk) {
size_t sz = (size_t)s->sb.st_size + 1;
char *bp;
bp = calloc(1, sz);
if (bp == NULL) {
copyfile_warn("cannot allocate %d bytes", sz);
return -1;
}
if (readlink(s->src, bp, sz-1) == -1) {
copyfile_warn("cannot readlink %s", s->src);
free(bp);
return -1;
}
if (symlink(bp, s->dst) == -1) {
if (errno != EEXIST || (s->flags & COPYFILE_EXCL)) {
copyfile_warn("Cannot make symlink %s", s->dst);
free(bp);
return -1;
}
}
free(bp);
s->dst_fd = open(s->dst, O_RDONLY | O_SYMLINK);
if (s->dst_fd == -1) {
copyfile_warn("Cannot open symlink %s for reading", s->dst);
return -1;
}
} else if (isdir) {
mode_t mode;
mode = s->sb.st_mode & ~S_IFMT;
if (mkdir(s->dst, mode) == -1) {
if (errno != EEXIST || (s->flags & COPYFILE_EXCL)) {
copyfile_warn("Cannot make directory %s", s->dst);
return -1;
}
}
s->dst_fd = open(s->dst, O_RDONLY | dsrc);
if (s->dst_fd == -1) {
copyfile_warn("Cannot open directory %s for reading", s->dst);
return -1;
}
} else while((s->dst_fd = open(s->dst, oflags | dsrc, s->sb.st_mode | S_IWUSR)) < 0)
{
/*
* We set S_IWUSR because fsetxattr does not -- at the time this comment
* was written -- allow one to set an extended attribute on a file descriptor
* for a read-only file, even if the file descriptor is opened for writing.
* This will only matter if the file does not already exist.
*/
switch(errno)
{
case EEXIST:
copyfile_debug(3, "open failed, retrying (%s)", s->dst);
if (s->flags & COPYFILE_EXCL)
break;
oflags = oflags & ~O_CREAT;
if (s->flags & (COPYFILE_PACK | COPYFILE_DATA))
{
copyfile_debug(4, "truncating existing file (%s)", s->dst);
oflags |= O_TRUNC;
}
continue;
case EACCES:
if(chmod(s->dst, (s->sb.st_mode | S_IWUSR) & ~S_IFMT) == 0)
continue;
else {
break;
}
case EISDIR:
copyfile_debug(3, "open failed because it is a directory (%s)", s->dst);
if ((s->flags & COPYFILE_EXCL) ||
(!isdir && (s->flags & COPYFILE_DATA)))
break;
oflags = (oflags & ~O_WRONLY) | O_RDONLY;
continue;
}
copyfile_warn("open on %s", s->dst);
return -1;
}
copyfile_debug(2, "open successful on destination (%s)", s->dst);
}
if (s->dst_fd < 0 || s->src_fd < 0)
{
copyfile_debug(1, "file descriptors not open (src: %d, dst: %d)",
s->src_fd, s->dst_fd);
errno = EINVAL;
return -1;
}
return 0;
}
/*
* copyfile_check(), as described above, essentially tells you
* what you'd have to copy, if you wanted it to copy the things
* you asked it to copy.
* In other words, if you pass in COPYFILE_ALL, and the file in
* question had no extended attributes but did have an ACL, you'd
* get back COPYFILE_ACL.
*/
static copyfile_flags_t copyfile_check(copyfile_state_t s)
{
acl_t acl = NULL;
copyfile_flags_t ret = 0;
int nofollow = (s->flags & COPYFILE_NOFOLLOW_SRC);
qtn_file_t qinfo;
if (!s->src)
{
errno = EINVAL;
return -1;
}
/* check EAs */
if (COPYFILE_XATTR & s->flags)
if (listxattr(s->src, 0, 0, nofollow ? XATTR_NOFOLLOW : 0) > 0)
{
ret |= COPYFILE_XATTR;
}
if (COPYFILE_ACL & s->flags)
{
(COPYFILE_NOFOLLOW_SRC & s->flags ? lstatx_np : statx_np)
(s->src, &s->sb, s->fsec);
if (filesec_get_property(s->fsec, FILESEC_ACL, &acl) == 0)
ret |= COPYFILE_ACL;
}
copyfile_debug(2, "check result: %d (%s)", ret, s->src);
if (acl)
acl_free(acl);
if (s->qinfo) {
/* If the state has had quarantine info set already, we use that */
ret |= ((s->flags & COPYFILE_XATTR) ? COPYFILE_XATTR : COPYFILE_ACL);
} else {
qinfo = qtn_file_alloc();
/*
* For quarantine information, we need to see if the source file
* has any. Since it may be a symlink, however, and we may, or
* not be following, *and* there's no qtn* routine which can optionally
* follow or not follow a symlink, we need to instead work around
* this limitation.
*/
if (qinfo) {
int fd;
int qret = 0;
struct stat sbuf;
/*
* If we care about not following symlinks, *and* the file exists
* (which is to say, lstat doesn't return an error), *and* the file
* is a symlink, then we open it up (with O_SYMLINK), and use
* qtn_file_init_with_fd(); if none of that is true, however, then
* we can simply use qtn_file_init_with_path().
*/
if (nofollow
&& lstat(s->src, &sbuf) == 0
&& ((sbuf.st_mode & S_IFMT) == S_IFLNK)) {
fd = open(s->src, O_RDONLY | O_SYMLINK);
if (fd != -1) {
if (!qtn_file_init_with_fd(qinfo, fd)) {
qret |= ((s->flags & COPYFILE_XATTR) ? COPYFILE_XATTR : COPYFILE_ACL);
}
close(fd);
}
} else {
if (!qtn_file_init_with_path(qinfo, s->src)) {
qret |= ((s->flags & COPYFILE_XATTR) ? COPYFILE_XATTR : COPYFILE_ACL);
}
}
qtn_file_free(qinfo);
ret |= qret;
}
}
return ret;
}