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/* wspy_register.c
*
* $Id$
*
* Wireshark Protocol Python Binding
*
* Copyright (c) 2009 by Sebastien Tandel <sebastien [AT] tandel [dot] be>
* Copyright (c) 2001 by Gerald Combs <gerald@wireshark.org>
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#ifdef HAVE_PYTHON
#include <Python.h>
#include <glib.h>
#include <stdio.h>
#include "epan.h"
#include "proto.h"
#include "packet.h"
#include "tvbuff.h"
#include "filesystem.h"
#include "wspy_register.h"
/* hash table containing all the registered python dissectors */
GHashTable * g_py_dissectors=NULL;
/**
* Global objects that python method dissect() will get. Avoid to write a
* function for each proto_tree*.
* Is it the only way to do that? I can't believe it ... think about it
*/
tvbuff_t * g_tvb = NULL;
packet_info * g_pinfo = NULL;
proto_tree * g_tree = NULL;
/* Initialization of the Python Interpreter */
static inline
void wspy_init(void)
{
Py_Initialize();
}
/* Finalization of the Python Interpreter */
static inline
void wspy_finalize(void)
{
Py_Finalize();
}
/*const char * py_dissector_short_desc(PyObject * py_dissector)
{
}*/
/**
* Returns the __str__ of the python object
*/
char * py_dissector_name(PyObject * py_dissector)
{
PyObject * py_object_name;
assert(py_dissector);
py_object_name = PyObject_Str(py_dissector);
return PyString_AS_STRING(py_object_name);
}
/**
* Register the dissector
*/
void py_dissector_register(PyObject * py_dissector)
{
/**
* Register protocol, fields, subtrees
*
* Done by calling register method of the object
*/
PyObject_CallMethod(py_dissector, "register_protocol", NULL);
}
static const char *get_py_register_file(void)
{
static const char * wspython_register_file = NULL;
if (!wspython_register_file) {
#ifdef _WIN32
wspython_register_file = g_strdup_printf("%s\\register-dissector.py", get_wspython_dir());
#else
wspython_register_file = g_strdup_printf("%s/register-dissector.py", get_wspython_dir());
#endif /* _WIN32 */
}
return wspython_register_file;
}
/**
* Finds out all the python dissectors and register them
*/
void register_all_py_protocols_func(void)
{
FILE * py_reg;
PyObject * global_dict, * main_module, * register_fn;
PyObject * py_dissectors, * py_dissector;
PyObject * py_args;
Py_ssize_t index;
char * name;
/* intialize the hash table where all the python dissectors are kept */
g_py_dissectors = g_hash_table_new(g_str_hash, g_str_equal);
/* STA TODO : init only if prefs is enabled */
wspy_init();
/* load the python register module */
py_reg = fopen(get_py_register_file(), "r");
if (py_reg == NULL) {
printf("Can't open Python registration file: %s\n", get_py_register_file());
return;
}
PyRun_SimpleFile(py_reg, get_py_register_file());
/* Getting the global symbols from the python register module */
main_module = PyImport_AddModule("__main__");
global_dict = PyModule_GetDict(main_module);
/* Get the python register function */
register_fn = PyDict_GetItemString(global_dict, "register_dissectors");
if (register_fn == NULL) {
printf("Error in Python registration file: %s\n", get_py_register_file());
return;
}
/* Execute the python register function */
/* This function returns a sequence of python dissectors objects */
py_args = Py_BuildValue("ss", get_wspython_dir(), get_plugins_pers_dir());
py_dissectors = PyObject_CallObject(register_fn, py_args);
/* Check that the py_dissectors is really a sequence */
if (!py_dissectors || !PySequence_Check(py_dissectors)) {
printf("Python dissectors not registered ...\n");
return;
}
/**
* For each dissector, register it in cb and registers all fields, subtrees,
* protocol name, etc ...
*/
for (index = 0; (py_dissector = PySequence_GetItem(py_dissectors, index)); index++)
{
name = py_dissector_name(py_dissector);
py_dissector_register(py_dissector);
g_hash_table_insert(g_py_dissectors, (gpointer*)name, py_dissector);
}
}
void py_dissector_args(tvbuff_t ** tvb, packet_info ** pinfo, proto_tree ** tree)
{
*tvb = g_tvb;
*pinfo = g_pinfo;
*tree = g_tree;
}
/*
* Generic Python Dissector
*
* Search the correct PyObject dissector based on
* pinfo->current_proto in the hash table py_dissectors.
*
* We then call the method "dissect" of this PyObject.
*/
void py_dissect(tvbuff_t * tvb, packet_info * pinfo,
proto_tree * tree)
{
PyObject * py_dissector;
/* printf("pinfo->current_proto : %s\n", pinfo->current_proto); */
/* NOTE => pinfo->current_proto == "HomePlug" */
g_tree = tree;
g_pinfo = pinfo;
g_tvb = tvb;
py_dissector = g_hash_table_lookup(g_py_dissectors, pinfo->current_proto);
assert(py_dissector);
PyObject_CallMethod(py_dissector, "pre_dissect", NULL);
}
dissector_handle_t py_create_dissector_handle(const int proto)
{
return create_dissector_handle(&py_dissect, proto);
}
static void register_all_py_handoffs_foreach(gpointer key _U_, gpointer value, gpointer user_data _U_)
{
PyObject * py_dissector = (PyObject *)value;
PyObject_CallMethod(py_dissector, "register_handoff", NULL);
}
/**
* Finalize the registration of the python protocol dissectors
*/
void
register_all_py_handoffs_func(void)
{
g_hash_table_foreach(g_py_dissectors, register_all_py_handoffs_foreach, NULL);
}
#endif /* HAVE_PYTHON */
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