source4/ntvfs/posix/python/pyxattr_tdb.c

   1 /*
   2    Unix SMB/CIFS implementation. Xattr manipulation bindings.
   3    Copyright (C) Matthieu Patou <mat@matws.net> 2009-2010
   4    Base on work of pyglue.c by Jelmer Vernooij <jelmer@samba.org> 2007 and
   5     Matthias Dieter Wallnöfer 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <Python.h>
  22 #include "includes.h"
  23 #include "system/filesys.h"
  24 #include "tdb_compat.h"
  25 #include "lib/tdb_wrap/tdb_wrap.h"
  26 #include "librpc/ndr/libndr.h"
  27 #include "lib/util/wrap_xattr.h"
  28 #include "ntvfs/posix/posix_eadb.h"
  29 #include "libcli/util/pyerrors.h"
  30 #include "param/pyparam.h"
  31 #include "lib/dbwrap/dbwrap.h"
  32 #include "lib/dbwrap/dbwrap_open.h"
  33 #include "lib/dbwrap/dbwrap_tdb.h"
  34 #include "source3/lib/xattr_tdb.h"
  35
  36 void initxattr_tdb(void);
  37
  38 static PyObject *py_is_xattr_supported(PyObject *self)
  39 {
  40         return Py_True;
  41 }
  42
  43 static PyObject *py_wrap_setxattr(PyObject *self, PyObject *args)
  44 {
  45         char *filename, *attribute, *tdbname;
  46         DATA_BLOB blob;
  47         int blobsize;
  48         int ret;
  49         TALLOC_CTX *mem_ctx;
  50         struct db_context *eadb = NULL;
  51         struct file_id id;
  52         struct stat sbuf;
  53
  54         if (!PyArg_ParseTuple(args, "ssss#", &tdbname, &filename, &attribute,
  55                                                   &blob.data, &blobsize))
  56                 return NULL;
  57
  58         blob.length = blobsize;
  59         mem_ctx = talloc_new(NULL);
  60         eadb = db_open_tdb(mem_ctx, py_default_loadparm_context(mem_ctx), tdbname, 50000,
  61                            TDB_DEFAULT, O_RDWR|O_CREAT, 0600, DBWRAP_LOCK_ORDER_2);
  62
  63         if (eadb == NULL) {
  64                 PyErr_SetFromErrno(PyExc_IOError);
  65                 talloc_free(mem_ctx);
  66                 return NULL;
  67         }
  68
  69         ret = stat(filename, &sbuf);
  70         if (ret < 0) {
  71                 PyErr_SetFromErrno(PyExc_IOError);
  72                 talloc_free(mem_ctx);
  73                 return NULL;
  74         }
  75
  76         ZERO_STRUCT(id);
  77         id.devid = sbuf.st_dev;
  78         id.inode = sbuf.st_ino;
  79
  80         ret = xattr_tdb_setattr(eadb, &id, attribute, blob.data, blob.length, 0);
  81         if (ret < 0) {
  82                 PyErr_SetFromErrno(PyExc_TypeError);
  83                 talloc_free(mem_ctx);
  84                 return NULL;
  85         }
  86         talloc_free(mem_ctx);
  87         Py_RETURN_NONE;
  88 }
  89
  90 static PyObject *py_wrap_getxattr(PyObject *self, PyObject *args)
  91 {
  92         char *filename, *attribute, *tdbname;
  93         TALLOC_CTX *mem_ctx;
  94         DATA_BLOB blob;
  95         PyObject *ret_obj;
  96         int ret;
  97         ssize_t xattr_size;
  98         struct db_context *eadb = NULL;
  99         struct file_id id;
 100         struct stat sbuf;
 101
 102         if (!PyArg_ParseTuple(args, "sss", &tdbname, &filename, &attribute))
 103                 return NULL;
 104
 105         mem_ctx = talloc_new(NULL);
 106
 107         eadb = db_open_tdb(mem_ctx, py_default_loadparm_context(mem_ctx), tdbname, 50000,
 108                            TDB_DEFAULT, O_RDWR|O_CREAT, 0600, DBWRAP_LOCK_ORDER_2);
 109
 110         if (eadb == NULL) {
 111                 PyErr_SetFromErrno(PyExc_IOError);
 112                 talloc_free(mem_ctx);
 113                 return NULL;
 114         }
 115
 116         ret = stat(filename, &sbuf);
 117         if (ret < 0) {
 118                 PyErr_SetFromErrno(PyExc_IOError);
 119                 talloc_free(mem_ctx);
 120                 return NULL;
 121         }
 122
 123         ZERO_STRUCT(id);
 124         id.devid = sbuf.st_dev;
 125         id.inode = sbuf.st_ino;
 126
 127         xattr_size = xattr_tdb_getattr(eadb, mem_ctx, &id, attribute, &blob);
 128         if (xattr_size < 0) {
 129                 PyErr_SetFromErrno(PyExc_TypeError);
 130                 talloc_free(mem_ctx);
 131                 return NULL;
 132         }
 133         ret_obj = PyString_FromStringAndSize((char *)blob.data, xattr_size);
 134         talloc_free(mem_ctx);
 135         return ret_obj;
 136 }
 137
 138 static PyMethodDef py_xattr_methods[] = {
 139         { "wrap_getxattr", (PyCFunction)py_wrap_getxattr, METH_VARARGS,
 140                 "wrap_getxattr(filename,attribute) -> blob\n"
 141                 "Retreive given attribute on the given file." },
 142         { "wrap_setxattr", (PyCFunction)py_wrap_setxattr, METH_VARARGS,
 143                 "wrap_setxattr(filename,attribute,value)\n"
 144                 "Set the given attribute to the given value on the given file." },
 145         { "is_xattr_supported", (PyCFunction)py_is_xattr_supported, METH_NOARGS,
 146                 "Return true if xattr are supported on this system\n"},
 147         { NULL }
 148 };
 149
 150 void initxattr_tdb(void)
 151 {
 152         PyObject *m;
 153
 154         m = Py_InitModule3("xattr_tdb", py_xattr_methods,
 155                            "Python bindings for xattr manipulation.");
 156         if (m == NULL)
 157                 return;
 158 }
 159