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/*
* Copyright (c) 2015 Balabit
* Copyright (c) 2015 Balazs Scheidler <balazs.scheidler@balabit.com>
* Copyright (c) 2023 Balazs Scheidler <balazs.scheidler@axoflow.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "python-global.h"
#include "python-config.h"
#include "python-main.h"
#include "python-global-code-loader.h"
#include "python-helpers.h"
#include "cfg.h"
static gboolean
_py_evaluate_global_code(PythonConfig *pc, const gchar *filename, const gchar *code)
{
PyObject *module;
module = _py_get_main_module(pc);
if (!module)
return FALSE;
/* NOTE: this has become a tad more difficult than PyRun_SimpleString(),
* because we want proper backtraces originating from this module. Should
* we only use PyRun_SimpleString(), we would not get source lines in our
* backtraces.
*
* This implementation basically mimics what an import would do, compiles
* the code as it was coming from a "virtual" file and then executes the
* compiled code in the context of the _syslogng_main module.
*
* Since we attach a __loader__ to the module, that will be called when
* the source is needed to report backtraces. Its implementation is in
* the python-global-code-loader.c, that simply returns the source when
* its get_source() method is called.
*/
PyObject *dict = PyModule_GetDict(module);
PyDict_SetItemString(dict, "__loader__", py_global_code_loader_new(code));
PyObject *code_object = Py_CompileString((char *) code, filename, Py_file_input);
if (!code_object)
{
gchar buf[256];
msg_error("Error compiling Python global code block",
evt_tag_str("exception", _py_format_exception_text(buf, sizeof(buf))));
_py_finish_exception_handling();
return FALSE;
}
module = PyImport_ExecCodeModuleEx("_syslogng_main", code_object, (char *) filename);
Py_DECREF(code_object);
if (!module)
{
gchar buf[256];
msg_error("Error evaluating global Python block",
evt_tag_str("exception", _py_format_exception_text(buf, sizeof(buf))));
_py_finish_exception_handling();
return FALSE;
}
return TRUE;
}
gboolean
python_evaluate_global_code(GlobalConfig *cfg, const gchar *code, CFG_LTYPE *yylloc)
{
PyGILState_STATE gstate;
gchar buf[256];
PythonConfig *pc = python_config_get(cfg);
gboolean result;
gstate = PyGILState_Ensure();
g_snprintf(buf, sizeof(buf), "%s{python-global-code:%d}", cfg->filename, yylloc->first_line);
result = _py_evaluate_global_code(pc, buf, code);
PyGILState_Release(gstate);
return result;
}
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