/* 
   Unix SMB/CIFS implementation.
   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
   Copyright (C) Matthias Dieter Wallnöfer          2009
   
   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 "ldb.h"
#include "ldb_errors.h"
#include "ldb_wrap.h"
#include "param/param.h"
#include "auth/credentials/credentials.h"
#include "dsdb/samdb/samdb.h"
#include "lib/ldb-samba/ldif_handlers.h"
#include "librpc/ndr/libndr.h"
#include "version.h"
#include <Python.h>
#include "lib/ldb/pyldb.h"
#include "libcli/util/pyerrors.h"
#include "libcli/security/security.h"
#include "auth/pyauth.h"
#include "param/pyparam.h"
#include "auth/credentials/pycredentials.h"

#ifndef Py_RETURN_NONE
#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
#endif

/* FIXME: These should be in a header file somewhere, once we finish moving
 * away from SWIG .. */
#define PyErr_LDB_OR_RAISE(py_ldb, ldb) \
/*	if (!PyLdb_Check(py_ldb)) { \
		PyErr_SetString(py_ldb_get_exception(), "Ldb connection object required"); \
		return NULL; \
	} */\
	ldb = PyLdb_AsLdbContext(py_ldb);

static void PyErr_SetLdbError(PyObject *error, int ret, struct ldb_context *ldb_ctx)
{
	if (ret == LDB_ERR_PYTHON_EXCEPTION)
		return; /* Python exception should already be set, just keep that */

	PyErr_SetObject(error, 
					Py_BuildValue(discard_const_p(char, "(i,s)"), ret, 
				  ldb_ctx == NULL?ldb_strerror(ret):ldb_errstring(ldb_ctx)));
}

static PyObject *py_ldb_get_exception(void)
{
	PyObject *mod = PyImport_ImportModule("ldb");
	if (mod == NULL)
		return NULL;

	return PyObject_GetAttrString(mod, "LdbError");
}

static PyObject *py_generate_random_str(PyObject *self, PyObject *args)
{
	int len;
	PyObject *ret;
	char *retstr;
	if (!PyArg_ParseTuple(args, "i", &len))
		return NULL;

	retstr = generate_random_str(NULL, len);
	ret = PyString_FromString(retstr);
	talloc_free(retstr);
	return ret;
}

static PyObject *py_unix2nttime(PyObject *self, PyObject *args)
{
	time_t t;
	NTTIME nt;
	if (!PyArg_ParseTuple(args, "I", &t))
		return NULL;

	unix_to_nt_time(&nt, t);

	return PyInt_FromLong((uint64_t)nt);
}

static PyObject *py_set_debug_level(PyObject *self, PyObject *args)
{
	unsigned level;
	if (!PyArg_ParseTuple(args, "I", &level))
		return NULL;
	(DEBUGLEVEL) = level;
	Py_RETURN_NONE;
}

static PyObject *py_ldb_set_credentials(PyObject *self, PyObject *args)
{
	PyObject *py_creds, *py_ldb;
	struct cli_credentials *creds;
	struct ldb_context *ldb;
	if (!PyArg_ParseTuple(args, "OO", &py_ldb, &py_creds))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);
	
	creds = cli_credentials_from_py_object(py_creds);
	if (creds == NULL) {
		PyErr_SetString(PyExc_TypeError, "Expected credentials object");
		return NULL;
	}

	ldb_set_opaque(ldb, "credentials", creds);

	Py_RETURN_NONE;
}

static PyObject *py_ldb_set_loadparm(PyObject *self, PyObject *args)
{
	PyObject *py_lp_ctx, *py_ldb;
	struct loadparm_context *lp_ctx;
	struct ldb_context *ldb;
	if (!PyArg_ParseTuple(args, "OO", &py_ldb, &py_lp_ctx))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	lp_ctx = lp_from_py_object(py_lp_ctx);
	if (lp_ctx == NULL) {
		PyErr_SetString(PyExc_TypeError, "Expected loadparm object");
		return NULL;
	}

    	ldb_set_opaque(ldb, "loadparm", lp_ctx);

	Py_RETURN_NONE;
}


static PyObject *py_ldb_set_session_info(PyObject *self, PyObject *args)
{
	PyObject *py_session_info, *py_ldb;
	struct auth_session_info *info;
	struct ldb_context *ldb;
	if (!PyArg_ParseTuple(args, "OO", &py_ldb, &py_session_info))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);
	/*if (!PyAuthSession_Check(py_session_info)) {
		PyErr_SetString(PyExc_TypeError, "Expected session info object");
		return NULL;
	}*/

	info = PyAuthSession_AsSession(py_session_info);

    	ldb_set_opaque(ldb, "sessionInfo", info);

	Py_RETURN_NONE;
}

static PyObject *py_ldb_set_utf8_casefold(PyObject *self, PyObject *args)
{
	PyObject *py_ldb;
	struct ldb_context *ldb;

	if (!PyArg_ParseTuple(args, "O", &py_ldb))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	ldb_set_utf8_fns(ldb, NULL, wrap_casefold);

	Py_RETURN_NONE;
}

static PyObject *py_samdb_set_domain_sid(PyLdbObject *self, PyObject *args)
{ 
	PyObject *py_ldb, *py_sid;
	struct ldb_context *ldb;
	struct dom_sid *sid;
	bool ret;

	if (!PyArg_ParseTuple(args, "OO", &py_ldb, &py_sid))
		return NULL;
	
	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	sid = dom_sid_parse_talloc(NULL, PyString_AsString(py_sid));

	ret = samdb_set_domain_sid(ldb, sid);
	if (!ret) {
		PyErr_SetString(PyExc_RuntimeError, "set_domain_sid failed");
		return NULL;
	} 
	Py_RETURN_NONE;
}

static PyObject *py_samdb_get_domain_sid(PyLdbObject *self, PyObject *args)
{ 
	PyObject *py_ldb;
	struct ldb_context *ldb;
	const struct dom_sid *sid;
	PyObject *ret;
	char *retstr;

	if (!PyArg_ParseTuple(args, "O", &py_ldb))
		return NULL;
	
	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	sid = samdb_domain_sid(ldb);
	if (!sid) {
		PyErr_SetString(PyExc_RuntimeError, "samdb_domain_sid failed");
		return NULL;
	} 
	retstr = dom_sid_string(NULL, sid);
	ret = PyString_FromString(retstr);
	talloc_free(retstr);
	return ret;
}

static PyObject *py_ldb_register_samba_handlers(PyObject *self, PyObject *args)
{
	PyObject *py_ldb;
	struct ldb_context *ldb;
	int ret;

	if (!PyArg_ParseTuple(args, "O", &py_ldb))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);
	ret = ldb_register_samba_handlers(ldb);

	PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_get_exception(), ret, ldb);
	Py_RETURN_NONE;
}

static PyObject *py_dsdb_set_ntds_invocation_id(PyObject *self, PyObject *args)
{
	PyObject *py_ldb, *py_guid;
	bool ret;
	struct GUID guid;
	struct ldb_context *ldb;
	if (!PyArg_ParseTuple(args, "OO", &py_ldb, &py_guid))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);
	GUID_from_string(PyString_AsString(py_guid), &guid);

	ret = samdb_set_ntds_invocation_id(ldb, &guid);
	if (!ret) {
		PyErr_SetString(PyExc_RuntimeError, "set_ntds_invocation_id failed");
		return NULL;
	}
	Py_RETURN_NONE;
}

static PyObject *py_dsdb_set_opaque_integer(PyObject *self, PyObject *args)
{
	PyObject *py_ldb;
	int value;
	int *old_val, *new_val;
	char *py_opaque_name, *opaque_name_talloc;
	struct ldb_context *ldb;
	TALLOC_CTX *tmp_ctx;

	if (!PyArg_ParseTuple(args, "Osi", &py_ldb, &py_opaque_name, &value))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	/* see if we have a cached copy */
	old_val = (int *)ldb_get_opaque(ldb, 
					py_opaque_name);

	if (old_val) {
		*old_val = value;
		Py_RETURN_NONE;
	} 

	tmp_ctx = talloc_new(ldb);
	if (tmp_ctx == NULL) {
		goto failed;
	}
	
	new_val = talloc(tmp_ctx, int);
	if (!new_val) {
		goto failed;
	}
	
	opaque_name_talloc = talloc_strdup(tmp_ctx, py_opaque_name);
	if (!opaque_name_talloc) {
		goto failed;
	}
	
	*new_val = value;

	/* cache the domain_sid in the ldb */
	if (ldb_set_opaque(ldb, opaque_name_talloc, new_val) != LDB_SUCCESS) {
		goto failed;
	}

	talloc_steal(ldb, new_val);
	talloc_steal(ldb, opaque_name_talloc);
	talloc_free(tmp_ctx);

	Py_RETURN_NONE;

failed:
	talloc_free(tmp_ctx);
	PyErr_SetString(PyExc_RuntimeError, "Failed to set opaque integer into the ldb!\n");
	return NULL;
}

static PyObject *py_dsdb_set_global_schema(PyObject *self, PyObject *args)
{
	PyObject *py_ldb;
	struct ldb_context *ldb;
	int ret;
	if (!PyArg_ParseTuple(args, "O", &py_ldb))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	ret = dsdb_set_global_schema(ldb);
	PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_get_exception(), ret, ldb);

	Py_RETURN_NONE;
}

static PyObject *py_dsdb_set_schema_from_ldif(PyObject *self, PyObject *args)
{
	WERROR result;
	char *pf, *df;
	PyObject *py_ldb;
	struct ldb_context *ldb;

	if (!PyArg_ParseTuple(args, "Oss", &py_ldb, &pf, &df))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	result = dsdb_set_schema_from_ldif(ldb, pf, df);
	PyErr_WERROR_IS_ERR_RAISE(result);

	Py_RETURN_NONE;
}

static PyObject *py_dsdb_convert_schema_to_openldap(PyObject *self, PyObject *args)
{
	char *target_str, *mapping;
	PyObject *py_ldb;
	struct ldb_context *ldb;
	PyObject *ret;
	char *retstr;

	if (!PyArg_ParseTuple(args, "Oss", &py_ldb, &target_str, &mapping))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	retstr = dsdb_convert_schema_to_openldap(ldb, target_str, mapping);
	if (!retstr) {
		PyErr_SetString(PyExc_RuntimeError, "dsdb_convert_schema_to_openldap failed");
		return NULL;
	} 
	ret = PyString_FromString(retstr);
	talloc_free(retstr);
	return ret;
}

static PyObject *py_dsdb_write_prefixes_from_schema_to_ldb(PyObject *self, PyObject *args)
{
	PyObject *py_ldb;
	struct ldb_context *ldb;
	WERROR result;
	struct dsdb_schema *schema;

	if (!PyArg_ParseTuple(args, "O", &py_ldb))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	schema = dsdb_get_schema(ldb);
	if (!schema) {
		PyErr_SetString(PyExc_RuntimeError, "Failed to set find a schema on ldb!\n");
		return NULL;
	}

	result = dsdb_write_prefixes_from_schema_to_ldb(NULL, ldb, schema);
	PyErr_WERROR_IS_ERR_RAISE(result);

	Py_RETURN_NONE;
}

static PyObject *py_dsdb_set_schema_from_ldb(PyObject *self, PyObject *args)
{
	PyObject *py_ldb;
	struct ldb_context *ldb;
	PyObject *py_from_ldb;
	struct ldb_context *from_ldb;
	struct dsdb_schema *schema;
	int ret;
	if (!PyArg_ParseTuple(args, "OO", &py_ldb, &py_from_ldb))
		return NULL;

	PyErr_LDB_OR_RAISE(py_ldb, ldb);

	PyErr_LDB_OR_RAISE(py_from_ldb, from_ldb);

	schema = dsdb_get_schema(from_ldb);
	if (!schema) {
		PyErr_SetString(PyExc_RuntimeError, "Failed to set find a schema on 'from' ldb!\n");
		return NULL;
	}

	ret = dsdb_reference_schema(ldb, schema, true);
	PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_get_exception(), ret, ldb);

	Py_RETURN_NONE;
}

static PyObject *py_dom_sid_to_rid(PyLdbObject *self, PyObject *args)
{
	PyObject *py_sid;
	struct dom_sid *sid;
	uint32_t rid;
	NTSTATUS status;
	
	if(!PyArg_ParseTuple(args, "O", &py_sid))
		return NULL;

	sid = dom_sid_parse_talloc(NULL, PyString_AsString(py_sid));

	status = dom_sid_split_rid(NULL, sid, NULL, &rid);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetString(PyExc_RuntimeError, "dom_sid_split_rid failed");
		return NULL;
	}

	return PyInt_FromLong(rid);
}

static PyMethodDef py_misc_methods[] = {
	{ "generate_random_str", (PyCFunction)py_generate_random_str, METH_VARARGS,
		"random_password(len) -> string\n"
		"Generate random password with specified length." },
	{ "unix2nttime", (PyCFunction)py_unix2nttime, METH_VARARGS,
		"unix2nttime(timestamp) -> nttime" },
	{ "ldb_set_credentials", (PyCFunction)py_ldb_set_credentials, METH_VARARGS, 
		"ldb_set_credentials(ldb, credentials) -> None\n"
		"Set credentials to use when connecting." },
	{ "ldb_set_session_info", (PyCFunction)py_ldb_set_session_info, METH_VARARGS,
		"ldb_set_session_info(ldb, session_info)\n"
		"Set session info to use when connecting." },
	{ "ldb_set_loadparm", (PyCFunction)py_ldb_set_loadparm, METH_VARARGS,
		"ldb_set_loadparm(ldb, session_info)\n"
		"Set loadparm context to use when connecting." },
	{ "samdb_set_domain_sid", (PyCFunction)py_samdb_set_domain_sid, METH_VARARGS,
		"samdb_set_domain_sid(samdb, sid)\n"
		"Set SID of domain to use." },
	{ "samdb_get_domain_sid", (PyCFunction)py_samdb_get_domain_sid, METH_VARARGS,
		"samdb_get_domain_sid(samdb)\n"
		"Get SID of domain in use." },
	{ "ldb_register_samba_handlers", (PyCFunction)py_ldb_register_samba_handlers, METH_VARARGS,
		"ldb_register_samba_handlers(ldb)\n"
		"Register Samba-specific LDB modules and schemas." },
	{ "ldb_set_utf8_casefold", (PyCFunction)py_ldb_set_utf8_casefold, METH_VARARGS,
		"ldb_set_utf8_casefold(ldb)\n"
		"Set the right Samba casefolding function for UTF8 charset." },
	{ "dsdb_set_ntds_invocation_id", (PyCFunction)py_dsdb_set_ntds_invocation_id, METH_VARARGS,
		NULL },
	{ "dsdb_set_opaque_integer", (PyCFunction)py_dsdb_set_opaque_integer, METH_VARARGS,
		NULL },
	{ "dsdb_set_global_schema", (PyCFunction)py_dsdb_set_global_schema, METH_VARARGS,
		NULL },
	{ "dsdb_set_schema_from_ldif", (PyCFunction)py_dsdb_set_schema_from_ldif, METH_VARARGS,
		NULL },
	{ "dsdb_write_prefixes_from_schema_to_ldb", (PyCFunction)py_dsdb_write_prefixes_from_schema_to_ldb, METH_VARARGS,
		NULL },
	{ "dsdb_set_schema_from_ldb", (PyCFunction)py_dsdb_set_schema_from_ldb, METH_VARARGS,
		NULL },
	{ "dsdb_convert_schema_to_openldap", (PyCFunction)py_dsdb_convert_schema_to_openldap, METH_VARARGS,
		NULL },
	{ "dom_sid_to_rid", (PyCFunction)py_dom_sid_to_rid, METH_VARARGS,
		NULL },
	{ "set_debug_level", (PyCFunction)py_set_debug_level, METH_VARARGS,
		"set debug level" },
	{ NULL }
};

void initglue(void)
{
	PyObject *m;

	m = Py_InitModule3("glue", py_misc_methods, 
			   "Python bindings for miscellaneous Samba functions.");
	if (m == NULL)
		return;

	PyModule_AddObject(m, "version", PyString_FromString(SAMBA_VERSION_STRING));

	PyModule_AddObject(m, "DS_BEHAVIOR_WIN2000", PyInt_FromLong(DS_BEHAVIOR_WIN2000));
	PyModule_AddObject(m, "DS_BEHAVIOR_WIN2003_INTERIM", PyInt_FromLong(DS_BEHAVIOR_WIN2003_INTERIM));
	PyModule_AddObject(m, "DS_BEHAVIOR_WIN2003", PyInt_FromLong(DS_BEHAVIOR_WIN2003));
	PyModule_AddObject(m, "DS_BEHAVIOR_WIN2008", PyInt_FromLong(DS_BEHAVIOR_WIN2008));

}