384 lines
11 KiB
C
384 lines
11 KiB
C
/*
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* pythonmod.c: unbound module C wrapper
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*
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* Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
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* Marek Vavrusa (xvavru00 AT stud.fit.vutbr.cz)
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of the organization nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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* Python module for unbound. Calls python script.
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*/
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/* ignore the varargs unused warning from SWIGs internal vararg support */
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#ifdef __GNUC__
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
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#endif
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#include "config.h"
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#include "ldns/sbuffer.h"
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#undef _POSIX_C_SOURCE
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#undef _XOPEN_SOURCE
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#include <Python.h>
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#include "pythonmod/pythonmod.h"
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#include "util/module.h"
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#include "util/config_file.h"
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#include "pythonmod_utils.h"
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#ifdef S_SPLINT_S
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typedef struct PyObject PyObject;
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typedef struct PyThreadState PyThreadState;
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typedef void* PyGILState_STATE;
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#endif
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/**
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* Global state for the module.
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*/
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struct pythonmod_env {
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/** Python script filename. */
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const char* fname;
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/** Python main thread */
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PyThreadState* mainthr;
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/** Python module. */
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PyObject* module;
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/** Module init function */
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PyObject* func_init;
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/** Module deinit function */
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PyObject* func_deinit;
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/** Module operate function */
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PyObject* func_operate;
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/** Module super_inform function */
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PyObject* func_inform;
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/** Python dictionary. */
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PyObject* dict;
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/** Module data. */
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PyObject* data;
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/** Module qstate. */
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struct module_qstate* qstate;
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};
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/**
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* Per query state for the iterator module.
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*/
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struct pythonmod_qstate {
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/** Module per query data. */
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PyObject* data;
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};
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/* Generated */
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#ifndef S_SPLINT_S
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#include "pythonmod/interface.h"
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#endif
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int pythonmod_init(struct module_env* env, int id)
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{
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/* Initialize module */
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FILE* script_py = NULL;
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PyObject* py_cfg, *res;
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PyGILState_STATE gil;
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struct pythonmod_env* pe = (struct pythonmod_env*)calloc(1, sizeof(struct pythonmod_env));
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if (!pe)
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{
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log_err("pythonmod: malloc failure");
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return 0;
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}
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env->modinfo[id] = (void*) pe;
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/* Initialize module */
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pe->fname = env->cfg->python_script;
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if(pe->fname==NULL || pe->fname[0]==0) {
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log_err("pythonmod: no script given.");
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return 0;
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}
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/* Initialize Python libraries */
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if (!Py_IsInitialized())
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{
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Py_SetProgramName("unbound");
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Py_NoSiteFlag = 1;
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Py_Initialize();
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PyEval_InitThreads();
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SWIG_init();
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pe->mainthr = PyEval_SaveThread();
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}
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gil = PyGILState_Ensure();
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/* Initialize Python */
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PyRun_SimpleString("import sys \n");
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PyRun_SimpleString("sys.path.append('.') \n");
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if(env->cfg->directory && env->cfg->directory[0]) {
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char wdir[1524];
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snprintf(wdir, sizeof(wdir), "sys.path.append('%s') \n",
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env->cfg->directory);
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PyRun_SimpleString(wdir);
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}
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PyRun_SimpleString("sys.path.append('"RUN_DIR"') \n");
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PyRun_SimpleString("sys.path.append('"SHARE_DIR"') \n");
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PyRun_SimpleString("import distutils.sysconfig \n");
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PyRun_SimpleString("sys.path.append(distutils.sysconfig.get_python_lib(1,0)) \n");
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if (PyRun_SimpleString("from unboundmodule import *\n") < 0)
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{
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log_err("pythonmod: cannot initialize core module: unboundmodule.py");
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PyGILState_Release(gil);
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return 0;
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}
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/* Check Python file load */
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if ((script_py = fopen(pe->fname, "r")) == NULL)
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{
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log_err("pythonmod: can't open file %s for reading", pe->fname);
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PyGILState_Release(gil);
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return 0;
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}
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/* Load file */
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pe->module = PyImport_AddModule("__main__");
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pe->dict = PyModule_GetDict(pe->module);
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pe->data = Py_None;
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Py_INCREF(pe->data);
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PyModule_AddObject(pe->module, "mod_env", pe->data);
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/* TODO: deallocation of pe->... if an error occurs */
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if (PyRun_SimpleFile(script_py, pe->fname) < 0)
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{
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log_err("pythonmod: can't parse Python script %s", pe->fname);
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PyGILState_Release(gil);
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return 0;
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}
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fclose(script_py);
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if ((pe->func_init = PyDict_GetItemString(pe->dict, "init")) == NULL)
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{
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log_err("pythonmod: function init is missing in %s", pe->fname);
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PyGILState_Release(gil);
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return 0;
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}
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if ((pe->func_deinit = PyDict_GetItemString(pe->dict, "deinit")) == NULL)
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{
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log_err("pythonmod: function deinit is missing in %s", pe->fname);
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PyGILState_Release(gil);
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return 0;
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}
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if ((pe->func_operate = PyDict_GetItemString(pe->dict, "operate")) == NULL)
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{
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log_err("pythonmod: function operate is missing in %s", pe->fname);
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PyGILState_Release(gil);
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return 0;
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}
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if ((pe->func_inform = PyDict_GetItemString(pe->dict, "inform_super")) == NULL)
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{
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log_err("pythonmod: function inform_super is missing in %s", pe->fname);
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PyGILState_Release(gil);
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return 0;
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}
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py_cfg = SWIG_NewPointerObj((void*) env->cfg, SWIGTYPE_p_config_file, 0);
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res = PyObject_CallFunction(pe->func_init, "iO", id, py_cfg);
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if (PyErr_Occurred())
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{
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log_err("pythonmod: Exception occurred in function init");
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PyErr_Print();
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}
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Py_XDECREF(res);
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Py_XDECREF(py_cfg);
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PyGILState_Release(gil);
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return 1;
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}
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void pythonmod_deinit(struct module_env* env, int id)
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{
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struct pythonmod_env* pe = env->modinfo[id];
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if(pe == NULL)
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return;
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/* Free Python resources */
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if(pe->module != NULL)
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{
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PyObject* res;
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PyGILState_STATE gil = PyGILState_Ensure();
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/* Deinit module */
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res = PyObject_CallFunction(pe->func_deinit, "i", id);
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if (PyErr_Occurred()) {
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log_err("pythonmod: Exception occurred in function deinit");
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PyErr_Print();
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}
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/* Free result if any */
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Py_XDECREF(res);
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/* Free shared data if any */
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Py_XDECREF(pe->data);
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PyGILState_Release(gil);
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PyEval_RestoreThread(pe->mainthr);
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Py_Finalize();
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pe->mainthr = NULL;
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}
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pe->fname = NULL;
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free(pe);
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/* Module is deallocated in Python */
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env->modinfo[id] = NULL;
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}
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void pythonmod_inform_super(struct module_qstate* qstate, int id, struct module_qstate* super)
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{
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struct pythonmod_env* pe = (struct pythonmod_env*)qstate->env->modinfo[id];
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struct pythonmod_qstate* pq = (struct pythonmod_qstate*)qstate->minfo[id];
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PyObject* py_qstate, *py_sqstate, *res;
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PyGILState_STATE gil = PyGILState_Ensure();
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log_query_info(VERB_ALGO, "pythonmod: inform_super, sub is", &qstate->qinfo);
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log_query_info(VERB_ALGO, "super is", &super->qinfo);
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py_qstate = SWIG_NewPointerObj((void*) qstate, SWIGTYPE_p_module_qstate, 0);
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py_sqstate = SWIG_NewPointerObj((void*) super, SWIGTYPE_p_module_qstate, 0);
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res = PyObject_CallFunction(pe->func_inform, "iOOO", id, py_qstate,
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py_sqstate, pq->data);
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if (PyErr_Occurred())
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{
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log_err("pythonmod: Exception occurred in function inform_super");
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PyErr_Print();
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qstate->ext_state[id] = module_error;
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}
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else if ((res == NULL) || (!PyObject_IsTrue(res)))
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{
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log_err("pythonmod: python returned bad code in inform_super");
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qstate->ext_state[id] = module_error;
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}
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Py_XDECREF(res);
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Py_XDECREF(py_sqstate);
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Py_XDECREF(py_qstate);
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PyGILState_Release(gil);
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}
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void pythonmod_operate(struct module_qstate* qstate, enum module_ev event,
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int id, struct outbound_entry* ATTR_UNUSED(outbound))
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{
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struct pythonmod_env* pe = (struct pythonmod_env*)qstate->env->modinfo[id];
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struct pythonmod_qstate* pq = (struct pythonmod_qstate*)qstate->minfo[id];
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PyObject* py_qstate, *res;
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PyGILState_STATE gil = PyGILState_Ensure();
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if ( pq == NULL)
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{
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/* create qstate */
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pq = qstate->minfo[id] = malloc(sizeof(struct pythonmod_qstate));
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/* Initialize per query data */
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pq->data = Py_None;
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Py_INCREF(pq->data);
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}
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/* Call operate */
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py_qstate = SWIG_NewPointerObj((void*) qstate, SWIGTYPE_p_module_qstate, 0);
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res = PyObject_CallFunction(pe->func_operate, "iiOO", id, (int) event,
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py_qstate, pq->data);
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if (PyErr_Occurred())
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{
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log_err("pythonmod: Exception occurred in function operate, event: %s", strmodulevent(event));
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PyErr_Print();
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qstate->ext_state[id] = module_error;
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}
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else if ((res == NULL) || (!PyObject_IsTrue(res)))
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{
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log_err("pythonmod: python returned bad code, event: %s", strmodulevent(event));
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qstate->ext_state[id] = module_error;
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}
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Py_XDECREF(res);
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Py_XDECREF(py_qstate);
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PyGILState_Release(gil);
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}
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void pythonmod_clear(struct module_qstate* qstate, int id)
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{
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struct pythonmod_qstate* pq;
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if (qstate == NULL)
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return;
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pq = (struct pythonmod_qstate*)qstate->minfo[id];
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verbose(VERB_ALGO, "pythonmod: clear, id: %d, pq:%lX", id,
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(unsigned long int)pq);
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if(pq != NULL)
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{
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PyGILState_STATE gil = PyGILState_Ensure();
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Py_DECREF(pq->data);
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PyGILState_Release(gil);
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/* Free qstate */
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free(pq);
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}
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qstate->minfo[id] = NULL;
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}
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size_t pythonmod_get_mem(struct module_env* env, int id)
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{
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struct pythonmod_env* pe = (struct pythonmod_env*)env->modinfo[id];
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verbose(VERB_ALGO, "pythonmod: get_mem, id: %d, pe:%lX", id,
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(unsigned long int)pe);
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if(!pe)
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return 0;
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return sizeof(*pe);
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}
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/**
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* The module function block
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*/
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static struct module_func_block pythonmod_block = {
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"python",
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&pythonmod_init, &pythonmod_deinit, &pythonmod_operate, &pythonmod_inform_super,
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&pythonmod_clear, &pythonmod_get_mem
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};
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struct module_func_block* pythonmod_get_funcblock(void)
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{
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return &pythonmod_block;
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}
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