int chdir( const char *path )
{
int rv = 0;
rtems_filesystem_eval_path_context_t ctx;
int eval_flags = RTEMS_FS_PERMS_EXEC
| RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_location_info_t pathloc;
rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
rtems_filesystem_eval_path_extract_currentloc( &ctx, &pathloc );
rv = rtems_filesystem_chdir( &pathloc );
rtems_filesystem_eval_path_cleanup( &ctx );
return rv;
}
static int register_subordinate_file_system(
rtems_filesystem_mount_table_entry_t *mt_entry,
const char *target
)
{
int rv = 0;
rtems_filesystem_eval_path_context_t ctx;
int eval_flags = RTEMS_FS_PERMS_RWX
| RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, target, eval_flags );
if ( !rtems_filesystem_location_is_instance_root( currentloc ) ) {
rtems_filesystem_location_info_t targetloc;
rtems_filesystem_global_location_t *mt_point_node;
rtems_filesystem_eval_path_extract_currentloc( &ctx, &targetloc );
mt_point_node = rtems_filesystem_location_transform_to_global( &targetloc );
mt_entry->mt_point_node = mt_point_node;
rv = (*mt_point_node->location.mt_entry->ops->mount_h)( mt_entry );
if ( rv == 0 ) {
rtems_filesystem_mt_lock();
rtems_chain_append_unprotected(
&rtems_filesystem_mount_table,
&mt_entry->mt_node
);
rtems_filesystem_mt_unlock();
} else {
rtems_filesystem_global_location_release( mt_point_node );
}
} else {
rtems_filesystem_eval_path_error( &ctx, EBUSY );
rv = -1;
}
rtems_filesystem_eval_path_cleanup( &ctx );
return rv;
}
static int do_open(
rtems_libio_t *iop,
const char *path,
int oflag,
mode_t mode
)
{
int rv = 0;
int fd = rtems_libio_iop_to_descriptor( iop );
int rwflag = oflag + 1;
bool read_access = (rwflag & _FREAD) == _FREAD;
bool write_access = (rwflag & _FWRITE) == _FWRITE;
bool make = (oflag & O_CREAT) == O_CREAT;
bool exclusive = (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
bool truncate = (oflag & O_TRUNC) == O_TRUNC;
int eval_flags = RTEMS_FS_FOLLOW_LINK
| (read_access ? RTEMS_FS_PERMS_READ : 0)
| (write_access ? RTEMS_FS_PERMS_WRITE : 0)
| (make ? RTEMS_FS_MAKE : 0)
| (exclusive ? RTEMS_FS_EXCLUSIVE : 0);
rtems_filesystem_eval_path_context_t ctx;
rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
if ( rtems_filesystem_eval_path_has_token( &ctx ) ) {
create_regular_file( &ctx, mode );
}
if ( write_access ) {
const rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( &ctx );
mode_t type = rtems_filesystem_location_type( currentloc );
if ( S_ISDIR( type ) ) {
rtems_filesystem_eval_path_error( &ctx, EISDIR );
}
}
iop->flags |= rtems_libio_fcntl_flags( oflag );
rtems_filesystem_eval_path_extract_currentloc( &ctx, &iop->pathinfo );
rtems_filesystem_eval_path_cleanup( &ctx );
rv = (*iop->pathinfo.handlers->open_h)( iop, path, oflag, mode );
if ( rv == 0 ) {
if ( truncate ) {
rv = ftruncate( fd, 0 );
if ( rv != 0 ) {
(*iop->pathinfo.handlers->close_h)( iop );
}
}
if ( rv == 0 ) {
rv = fd;
} else {
rv = -1;
}
}
if ( rv < 0 ) {
rtems_libio_free( iop );
}
return rv;
}
int rtems_tarfs_load(
const char *mountpoint,
uint8_t *tar_image,
size_t tar_size
)
{
const char *hdr_ptr;
char filename[100];
char full_filename[256];
int hdr_chksum;
unsigned char linkflag;
unsigned long file_size;
unsigned long file_mode;
int offset;
unsigned long nblocks;
int rv = 0;
int eval_flags = RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_eval_path_context_t ctx;
rtems_filesystem_location_info_t rootloc;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, mountpoint, eval_flags );
rtems_filesystem_eval_path_extract_currentloc( &ctx, &rootloc );
rtems_filesystem_eval_path_set_flags(
&ctx,
RTEMS_FS_MAKE | RTEMS_FS_EXCLUSIVE
);
if ( !IMFS_is_imfs_instance( &rootloc ) ) {
rv = -1;
}
/*
* Create an IMFS node structure pointing to tar image memory.
*/
offset = 0;
while ( rv == 0 ) {
if (offset + 512 > tar_size)
break;
/*
* Read a header.
*/
hdr_ptr = (char *) &tar_image[offset];
offset += 512;
if (strncmp(&hdr_ptr[257], "ustar", 5))
break;
strncpy(filename, hdr_ptr, MAX_NAME_FIELD_SIZE);
filename[MAX_NAME_FIELD_SIZE] = '\0';
linkflag = hdr_ptr[156];
file_mode = _rtems_octal2ulong(&hdr_ptr[100], 8);
file_size = _rtems_octal2ulong(&hdr_ptr[124], 12);
hdr_chksum = _rtems_octal2ulong(&hdr_ptr[148], 8);
if (_rtems_tar_header_checksum(hdr_ptr) != hdr_chksum)
break;
/*
* Generate an IMFS node depending on the file type.
* - For directories, just create directories as usual. IMFS
* will take care of the rest.
* - For symbolic links, create as usual
* - For files, create a file node with special tarfs properties.
*/
if (linkflag == DIRTYPE) {
int len;
strncpy(full_filename, mountpoint, 255);
if (full_filename[(len=strlen(full_filename))-1] != '/')
strcat(full_filename, "/");
++len;
strncat(full_filename, filename, 256-len-1);
if ( mkdir(full_filename, S_IRWXU | S_IRWXG | S_IRWXO) != 0 ) {
if (errno == EEXIST) {
struct stat stat_buf;
if ( stat(full_filename, &stat_buf) == 0 ) {
if ( S_ISDIR(stat_buf.st_mode) ) {
continue;
} else {
if ( unlink(full_filename) != -1 ) {
if ( mkdir(full_filename, S_IRWXU | S_IRWXG | S_IRWXO) == 0 )
continue;
}
}
}
}
rv = -1;
}
}
/*
* Create a LINEAR_FILE node
*/
else if (linkflag == REGTYPE) {
rtems_filesystem_location_free( currentloc );
rtems_filesystem_location_clone( currentloc, &rootloc );
rtems_filesystem_eval_path_set_path(
&ctx,
filename,
strlen( filename )
);
rtems_filesystem_eval_path_continue( &ctx );
if ( !rtems_filesystem_location_is_null( currentloc ) ) {
IMFS_linearfile_t *linfile = (IMFS_linearfile_t *)
IMFS_create_node(
currentloc,
&IMFS_node_control_linfile,
sizeof( IMFS_file_t ),
rtems_filesystem_eval_path_get_token( &ctx ),
rtems_filesystem_eval_path_get_tokenlen( &ctx ),
(file_mode & (S_IRWXU | S_IRWXG | S_IRWXO)) | S_IFREG,
NULL
);
if ( linfile != NULL ) {
linfile->File.size = file_size;
linfile->direct = &tar_image[offset];
}
}
nblocks = (((file_size) + 511) & ~511) / 512;
offset += 512 * nblocks;
}
/*
* Create a symbolic link
*/
else if (linkflag == SYMTYPE) {
const char *linkto = hdr_ptr + 157;
int len;
strncpy(full_filename, mountpoint, 255);
if (full_filename[(len=strlen(full_filename))-1] != '/')
strcat(full_filename, "/");
++len;
strncat(full_filename, filename, 256-len-1);
rv = symlink(linkto, full_filename);
}
}
rtems_filesystem_location_free( &rootloc );
rtems_filesystem_eval_path_cleanup( &ctx );
return rv;
}
int chroot( const char *path )
{
int rv = 0;
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_filesystem_eval_path_context_t ctx;
int eval_flags = RTEMS_FS_PERMS_EXEC
| RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_location_info_t loc;
rtems_filesystem_global_location_t *new_current_loc;
/*
* We use the global environment for path evaluation. This makes it possible
* to escape from a chroot environment referencing an unmounted file system.
*/
rtems_filesystem_eval_path_start_with_root_and_current(
&ctx,
path,
eval_flags,
&rtems_global_user_env.root_directory,
&rtems_global_user_env.current_directory
);
rtems_filesystem_eval_path_extract_currentloc( &ctx, &loc );
new_current_loc = rtems_filesystem_location_transform_to_global( &loc );
if ( !rtems_filesystem_global_location_is_null( new_current_loc ) ) {
rtems_filesystem_global_location_t *new_root_loc =
rtems_filesystem_global_location_obtain( &new_current_loc );
rtems_filesystem_node_types_t type =
(*new_root_loc->location.mt_entry->ops->node_type_h)(
&new_root_loc->location
);
if ( type == RTEMS_FILESYSTEM_DIRECTORY ) {
sc = rtems_libio_set_private_env();
if (sc == RTEMS_SUCCESSFUL) {
rtems_filesystem_global_location_assign(
&rtems_filesystem_root,
new_root_loc
);
rtems_filesystem_global_location_assign(
&rtems_filesystem_current,
new_current_loc
);
} else {
if (sc != RTEMS_UNSATISFIED) {
errno = ENOMEM;
}
rv = -1;
}
} else {
rtems_filesystem_location_error( &new_root_loc->location, ENOTDIR );
rv = -1;
}
if ( rv != 0 ) {
rtems_filesystem_global_location_release( new_root_loc );
}
} else {
rv = -1;
}
rtems_filesystem_eval_path_cleanup( &ctx );
if ( rv != 0 ) {
rtems_filesystem_global_location_release( new_current_loc );
}
return rv;
}
int rtems_tarfs_load(
const char *mountpoint,
uint8_t *tar_image,
size_t tar_size
)
{
const char *hdr_ptr;
char filename[100];
char full_filename[256];
int hdr_chksum;
unsigned char linkflag;
unsigned long file_size;
unsigned long file_mode;
int offset;
unsigned long nblocks;
IMFS_jnode_t *node;
int rv = 0;
int eval_flags = RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_eval_path_context_t ctx;
rtems_filesystem_location_info_t rootloc;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, mountpoint, eval_flags );
rtems_filesystem_eval_path_extract_currentloc( &ctx, &rootloc );
rtems_filesystem_eval_path_set_flags(
&ctx,
RTEMS_FS_MAKE | RTEMS_FS_EXCLUSIVE
);
if (
rootloc.mt_entry->ops != &IMFS_ops
&& rootloc.mt_entry->ops != &fifoIMFS_ops
) {
rv = -1;
}
/*
* Create an IMFS node structure pointing to tar image memory.
*/
offset = 0;
while ( rv == 0 ) {
if (offset + 512 > tar_size)
break;
/*
* Read a header.
*/
hdr_ptr = (char *) &tar_image[offset];
offset += 512;
if (strncmp(&hdr_ptr[257], "ustar", 5))
break;
strncpy(filename, hdr_ptr, MAX_NAME_FIELD_SIZE);
filename[MAX_NAME_FIELD_SIZE] = '\0';
linkflag = hdr_ptr[156];
file_mode = _rtems_octal2ulong(&hdr_ptr[100], 8);
file_size = _rtems_octal2ulong(&hdr_ptr[124], 12);
hdr_chksum = _rtems_octal2ulong(&hdr_ptr[148], 8);
if (_rtems_tar_header_checksum(hdr_ptr) != hdr_chksum)
break;
/*
* Generate an IMFS node depending on the file type.
* - For directories, just create directories as usual. IMFS
* will take care of the rest.
* - For files, create a file node with special tarfs properties.
*/
if (linkflag == DIRTYPE) {
strcpy(full_filename, mountpoint);
if (full_filename[strlen(full_filename)-1] != '/')
strcat(full_filename, "/");
strcat(full_filename, filename);
mkdir(full_filename, S_IRWXU | S_IRWXG | S_IRWXO);
}
/*
* Create a LINEAR_FILE node
*/
else if (linkflag == REGTYPE) {
rtems_filesystem_location_free( currentloc );
rtems_filesystem_location_clone( currentloc, &rootloc );
rtems_filesystem_eval_path_set_path(
&ctx,
filename,
strlen( filename )
);
rtems_filesystem_eval_path_continue( &ctx );
if ( !rtems_filesystem_location_is_null( currentloc ) ) {
node = IMFS_create_node(
currentloc,
IMFS_LINEAR_FILE,
rtems_filesystem_eval_path_get_token( &ctx ),
rtems_filesystem_eval_path_get_tokenlen( &ctx ),
(file_mode & (S_IRWXU | S_IRWXG | S_IRWXO)) | S_IFREG,
NULL
);
node->info.linearfile.size = file_size;
node->info.linearfile.direct = &tar_image[offset];
}
nblocks = (((file_size) + 511) & ~511) / 512;
offset += 512 * nblocks;
}
}
rtems_filesystem_location_free( &rootloc );
rtems_filesystem_eval_path_cleanup( &ctx );
return rv;
}
