/*
create extra attribute shortcuts
*/
static void dsdb_setup_attribute_shortcuts(struct ldb_context *ldb, struct dsdb_schema *schema)
{
struct dsdb_attribute *attribute;
/* setup fast access to one_way_link and DN format */
for (attribute=schema->attributes; attribute; attribute=attribute->next) {
attribute->dn_format = dsdb_dn_oid_to_format(attribute->syntax->ldap_oid);
if (attribute->dn_format == DSDB_INVALID_DN) {
attribute->one_way_link = false;
continue;
}
/* these are not considered to be one way links for
the purpose of DN link fixups */
if (ldb_attr_cmp("distinguishedName", attribute->lDAPDisplayName) == 0 ||
ldb_attr_cmp("objectCategory", attribute->lDAPDisplayName) == 0) {
attribute->one_way_link = false;
continue;
}
if (attribute->linkID == 0) {
attribute->one_way_link = true;
continue;
}
/* handle attributes with a linkID but no backlink */
if ((attribute->linkID & 1) == 0 &&
dsdb_attribute_by_linkID(schema, attribute->linkID + 1) == NULL) {
attribute->one_way_link = true;
continue;
}
attribute->one_way_link = false;
}
}
/*
return the backlink attribute name (if any) for an attribute
*/
static PyObject *py_dsdb_get_backlink_from_lDAPDisplayName(PyObject *self, PyObject *args)
{
PyObject *py_ldb;
struct ldb_context *ldb;
struct dsdb_schema *schema;
const char *ldap_display_name;
const struct dsdb_attribute *attribute, *target_attr;
if (!PyArg_ParseTuple(args, "Os", &py_ldb, &ldap_display_name))
return NULL;
PyErr_LDB_OR_RAISE(py_ldb, ldb);
schema = dsdb_get_schema(ldb, NULL);
if (!schema) {
PyErr_SetString(PyExc_RuntimeError, "Failed to find a schema from ldb");
return NULL;
}
attribute = dsdb_attribute_by_lDAPDisplayName(schema, ldap_display_name);
if (attribute == NULL) {
PyErr_Format(PyExc_KeyError, "Failed to find attribute '%s'", ldap_display_name);
return NULL;
}
if (attribute->linkID == 0) {
Py_RETURN_NONE;
}
target_attr = dsdb_attribute_by_linkID(schema, attribute->linkID ^ 1);
if (target_attr == NULL) {
/* when we add pseudo-backlinks we'll need to handle
them here */
Py_RETURN_NONE;
}
return PyString_FromString(target_attr->lDAPDisplayName);
}
