/* Unix SMB/CIFS implementation. POSIX NTVFS backend - xattr support using filesystem xattrs Copyright (C) Andrew Tridgell 2004 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "vfs_posix.h" #include "../lib/util/wrap_xattr.h" /* pull a xattr as a blob, from either a file or a file descriptor */ NTSTATUS pull_xattr_blob_system(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx, const char *attr_name, const char *fname, int fd, size_t estimated_size, DATA_BLOB *blob) { int ret; *blob = data_blob_talloc(mem_ctx, NULL, estimated_size+16); if (blob->data == NULL) { return NT_STATUS_NO_MEMORY; } again: if (fd != -1) { ret = wrap_fgetxattr(fd, attr_name, blob->data, estimated_size); } else { ret = wrap_getxattr(fname, attr_name, blob->data, estimated_size); } if (ret == -1 && errno == ERANGE) { estimated_size *= 2; blob->data = talloc_realloc(mem_ctx, blob->data, uint8_t, estimated_size); if (blob->data == NULL) { return NT_STATUS_NO_MEMORY; } blob->length = estimated_size; goto again; } if (ret == -1 && errno == EPERM) { struct stat statbuf; if (fd != -1) { ret = fstat(fd, &statbuf); } else { ret = stat(fname, &statbuf); } if (ret == 0) { /* check if this is a directory and the sticky bit is set */ if (S_ISDIR(statbuf.st_mode) && (statbuf.st_mode & S_ISVTX)) { /* pretend we could not find the xattr */ data_blob_free(blob); return NT_STATUS_NOT_FOUND; } else { /* if not this was probably a legitimate error * reset ret and errno to the correct values */ errno = EPERM; ret = -1; } } } if (ret == -1) { data_blob_free(blob); return pvfs_map_errno(pvfs, errno); } blob->length = ret; return NT_STATUS_OK; } /* push a xattr as a blob, from either a file or a file descriptor */ NTSTATUS push_xattr_blob_system(struct pvfs_state *pvfs, const char *attr_name, const char *fname, int fd, const DATA_BLOB *blob) { int ret; if (fd != -1) { ret = wrap_fsetxattr(fd, attr_name, blob->data, blob->length, 0); } else { ret = wrap_setxattr(fname, attr_name, blob->data, blob->length, 0); } if (ret == -1) { return pvfs_map_errno(pvfs, errno); } return NT_STATUS_OK; } /* delete a xattr */ NTSTATUS delete_xattr_system(struct pvfs_state *pvfs, const char *attr_name, const char *fname, int fd) { int ret; if (fd != -1) { ret = wrap_fremovexattr(fd, attr_name); } else { ret = wrap_removexattr(fname, attr_name); } if (ret == -1) { return pvfs_map_errno(pvfs, errno); } return NT_STATUS_OK; } /* unlink a file - cleanup any xattrs */ NTSTATUS unlink_xattr_system(struct pvfs_state *pvfs, const char *fname) { /* nothing needs to be done for filesystem based xattrs */ return NT_STATUS_OK; }