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// Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
// $Id$
#include <dns/messagerenderer.h>
// For each class, we need a struct, a helper functions (init, destroy,
// and static wrappers around the methods we export), a list of methods,
// and a type description
using namespace isc::dns;
// MessageRenderer
// since we don't use *Buffer in the python version (but work with
// the already existing bytearray type where we use these custom buffers
// in c++, we need to keep track of one here.
typedef struct {
PyObject_HEAD
OutputBuffer* outputbuffer;
MessageRenderer* messagerenderer;
} s_MessageRenderer;
static int MessageRenderer_init(s_MessageRenderer* self);
static void MessageRenderer_destroy(s_MessageRenderer* self);
static PyObject* MessageRenderer_getData(s_MessageRenderer* self);
static PyObject* MessageRenderer_getLength(s_MessageRenderer* self);
static PyObject* MessageRenderer_isTruncated(s_MessageRenderer* self);
static PyObject* MessageRenderer_getLengthLimit(s_MessageRenderer* self);
// TODO: set/get compressmode
static PyObject* MessageRenderer_setTruncated(s_MessageRenderer* self);
static PyObject* MessageRenderer_setLengthLimit(s_MessageRenderer* self, PyObject* args);
static PyMethodDef MessageRenderer_methods[] = {
{ "get_data", reinterpret_cast<PyCFunction>(MessageRenderer_getData), METH_NOARGS,
"Returns the data as a bytes() object" },
{ "get_length", reinterpret_cast<PyCFunction>(MessageRenderer_getLength), METH_NOARGS,
"Returns the length of the data" },
{ "is_truncated", reinterpret_cast<PyCFunction>(MessageRenderer_isTruncated), METH_NOARGS,
"Returns True if the data is truncated" },
{ "get_length_limit", reinterpret_cast<PyCFunction>(MessageRenderer_getLengthLimit), METH_NOARGS,
"Returns the length limit of the data" },
{ "set_truncated", reinterpret_cast<PyCFunction>(MessageRenderer_setTruncated), METH_NOARGS,
"Sets truncated to true" },
{ "set_length_limit", reinterpret_cast<PyCFunction>(MessageRenderer_setLengthLimit), METH_VARARGS,
"Sets the length limit of the data to the given number" },
{ NULL, NULL, 0, NULL }
};
static PyTypeObject messagerenderer_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"libdns_python.MessageRenderer",
sizeof(s_MessageRenderer), // tp_basicsize
0, // tp_itemsize
(destructor)MessageRenderer_destroy,// tp_dealloc
NULL, // tp_print
NULL, // tp_getattr
NULL, // tp_setattr
NULL, // tp_reserved
NULL, // tp_repr
NULL, // tp_as_number
NULL, // tp_as_sequence
NULL, // tp_as_mapping
NULL, // tp_hash
NULL, // tp_call
NULL, // tp_str
NULL, // tp_getattro
NULL, // tp_setattro
NULL, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
"The MessageRenderer class encapsulates implementation details "
"of rendering a DNS message into a buffer in wire format. "
"In effect, it's simply responsible for name compression at least in the "
"current implementation. A MessageRenderer class object manages the "
"positions of names rendered in a buffer and uses that information to render "
"subsequent names with compression.",
NULL, // tp_traverse
NULL, // tp_clear
NULL, // tp_richcompare
0, // tp_weaklistoffset
NULL, // tp_iter
NULL, // tp_iternext
MessageRenderer_methods, // tp_methods
NULL, // tp_members
NULL, // tp_getset
NULL, // tp_base
NULL, // tp_dict
NULL, // tp_descr_get
NULL, // tp_descr_set
0, // tp_dictoffset
(initproc)MessageRenderer_init, // tp_init
NULL, // tp_alloc
PyType_GenericNew, // tp_new
NULL, // tp_free
NULL, // tp_is_gc
NULL, // tp_bases
NULL, // tp_mro
NULL, // tp_cache
NULL, // tp_subclasses
NULL, // tp_weaklist
// Note: not sure if the following are correct. Added them just to
// make the compiler happy.
NULL, // tp_del
0 // tp_version_tag
};
static int
MessageRenderer_init(s_MessageRenderer* self) {
self->outputbuffer = new OutputBuffer(4096);
self->messagerenderer = new MessageRenderer(*self->outputbuffer);
return 0;
}
static void
MessageRenderer_destroy(s_MessageRenderer* self) {
delete self->messagerenderer;
delete self->outputbuffer;
self->messagerenderer = NULL;
Py_TYPE(self)->tp_free(self);
}
static PyObject*
MessageRenderer_getData(s_MessageRenderer* self) {
return Py_BuildValue("y#",
self->messagerenderer->getData(),
self->messagerenderer->getLength());
}
static PyObject*
MessageRenderer_getLength(s_MessageRenderer* self) {
return Py_BuildValue("I", self->messagerenderer->getLength());
}
static PyObject*
MessageRenderer_isTruncated(s_MessageRenderer* self) {
if (self->messagerenderer->isTruncated()) {
Py_RETURN_TRUE;
} else {
Py_RETURN_FALSE;
}
}
static PyObject*
MessageRenderer_getLengthLimit(s_MessageRenderer* self) {
return Py_BuildValue("I", self->messagerenderer->getLengthLimit());
}
static PyObject*
MessageRenderer_setTruncated(s_MessageRenderer* self) {
self->messagerenderer->setTruncated();
Py_RETURN_NONE;
}
static PyObject*
MessageRenderer_setLengthLimit(s_MessageRenderer* self,
PyObject* args)
{
size_t lengthlimit;
if (!PyArg_ParseTuple(args, "I", &lengthlimit)) {
return NULL;
}
self->messagerenderer->setLengthLimit(lengthlimit);
Py_RETURN_NONE;
}
// end of MessageRenderer
// Module Initialization, all statics are initialized here
bool
initModulePart_MessageRenderer(PyObject* mod) {
// Add the exceptions to the module
// Add the enums to the module
// Add the constants to the module
// Add the classes to the module
// We initialize the static description object with PyType_Ready(),
// then add it to the module
// NameComparisonResult
if (PyType_Ready(&messagerenderer_type) < 0) {
return false;
}
Py_INCREF(&messagerenderer_type);
PyModule_AddObject(mod, "MessageRenderer",
reinterpret_cast<PyObject*>(&messagerenderer_type));
return true;
}
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