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