danicoin/external/unbound/pythonmod/pythonmod.c
2014-10-05 23:44:31 +02:00

384 lines
11 KiB
C

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