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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.
#include <Python.h>
#include <util/buffer.h>
#include <dns/messagerenderer.h>
#include <util/python/pycppwrapper_util.h>
#include "pydnspp_common.h"
#include "messagerenderer_python.h"
using namespace isc::dns;
using namespace isc::dns::python;
using namespace isc::util;
using namespace isc::util::python;
namespace {
// The s_* Class simply covers one instantiation of the object.
//
// 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.
class s_MessageRenderer : public PyObject {
public:
s_MessageRenderer();
MessageRenderer* cppobj;
};
int MessageRenderer_init(s_MessageRenderer* self);
void MessageRenderer_destroy(s_MessageRenderer* self);
PyObject* MessageRenderer_getData(s_MessageRenderer* self);
PyObject* MessageRenderer_getLength(s_MessageRenderer* self);
PyObject* MessageRenderer_isTruncated(s_MessageRenderer* self);
PyObject* MessageRenderer_getLengthLimit(s_MessageRenderer* self);
PyObject* MessageRenderer_getCompressMode(s_MessageRenderer* self);
PyObject* MessageRenderer_setTruncated(s_MessageRenderer* self);
PyObject* MessageRenderer_setLengthLimit(s_MessageRenderer* self, PyObject* args);
PyObject* MessageRenderer_setCompressMode(s_MessageRenderer* self, PyObject* args);
PyObject* MessageRenderer_clear(s_MessageRenderer* self);
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" },
{ "get_compress_mode", reinterpret_cast<PyCFunction>(MessageRenderer_getCompressMode), METH_NOARGS,
"Returns the current compression mode" },
{ "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" },
{ "set_compress_mode", reinterpret_cast<PyCFunction>(MessageRenderer_setCompressMode), METH_VARARGS,
"Sets the compression mode of the MessageRenderer" },
{ "clear", reinterpret_cast<PyCFunction>(MessageRenderer_clear),
METH_NOARGS,
"Clear the internal buffer and other internal resources." },
{ NULL, NULL, 0, NULL }
};
int
MessageRenderer_init(s_MessageRenderer* self) {
self->cppobj = new MessageRenderer;
return (0);
}
void
MessageRenderer_destroy(s_MessageRenderer* self) {
delete self->cppobj;
self->cppobj = NULL;
Py_TYPE(self)->tp_free(self);
}
PyObject*
MessageRenderer_getData(s_MessageRenderer* self) {
return (Py_BuildValue("y#",
self->cppobj->getData(),
self->cppobj->getLength()));
}
PyObject*
MessageRenderer_getLength(s_MessageRenderer* self) {
return (Py_BuildValue("I", self->cppobj->getLength()));
}
PyObject*
MessageRenderer_isTruncated(s_MessageRenderer* self) {
if (self->cppobj->isTruncated()) {
Py_RETURN_TRUE;
} else {
Py_RETURN_FALSE;
}
}
PyObject*
MessageRenderer_getLengthLimit(s_MessageRenderer* self) {
return (Py_BuildValue("I", self->cppobj->getLengthLimit()));
}
PyObject*
MessageRenderer_getCompressMode(s_MessageRenderer* self) {
return (Py_BuildValue("I", self->cppobj->getCompressMode()));
}
PyObject*
MessageRenderer_setTruncated(s_MessageRenderer* self) {
self->cppobj->setTruncated();
Py_RETURN_NONE;
}
PyObject*
MessageRenderer_setLengthLimit(s_MessageRenderer* self,
PyObject* args)
{
long lengthlimit;
if (!PyArg_ParseTuple(args, "l", &lengthlimit)) {
PyErr_Clear();
PyErr_SetString(PyExc_TypeError,
"No valid type in set_length_limit argument");
return (NULL);
}
if (lengthlimit < 0) {
PyErr_SetString(PyExc_ValueError,
"MessageRenderer length limit out of range");
return (NULL);
}
self->cppobj->setLengthLimit(lengthlimit);
Py_RETURN_NONE;
}
PyObject*
MessageRenderer_setCompressMode(s_MessageRenderer* self,
PyObject* args)
{
int mode;
if (!PyArg_ParseTuple(args, "i", &mode)) {
return (NULL);
}
if (mode == MessageRenderer::CASE_INSENSITIVE) {
self->cppobj->setCompressMode(MessageRenderer::CASE_INSENSITIVE);
// If we return NULL it is seen as an error, so use this for
// None returns, it also applies to CASE_SENSITIVE.
Py_RETURN_NONE;
} else if (mode == MessageRenderer::CASE_SENSITIVE) {
self->cppobj->setCompressMode(MessageRenderer::CASE_SENSITIVE);
Py_RETURN_NONE;
} else {
PyErr_SetString(PyExc_TypeError,
"MessageRenderer compress mode must be MessageRenderer.CASE_INSENSITIVE"
"or MessageRenderer.CASE_SENSITIVE");
return (NULL);
}
}
PyObject*
MessageRenderer_clear(s_MessageRenderer* self) {
self->cppobj->clear();
Py_RETURN_NONE;
}
} // end of unnamed namespace
namespace isc {
namespace dns {
namespace python {
PyTypeObject messagerenderer_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"pydnspp.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
NULL, // tp_del
0 // tp_version_tag
};
// If we need a createMessageRendererObject(), should we copy? can we?
// copy the existing buffer into a new one, then create a new renderer with
// that buffer?
bool
PyMessageRenderer_Check(PyObject* obj) {
if (obj == NULL) {
isc_throw(PyCPPWrapperException, "obj argument NULL in typecheck");
}
return (PyObject_TypeCheck(obj, &messagerenderer_type));
}
MessageRenderer&
PyMessageRenderer_ToMessageRenderer(PyObject* messagerenderer_obj) {
if (messagerenderer_obj == NULL) {
isc_throw(PyCPPWrapperException,
"obj argument NULL in MessageRenderer PyObject conversion");
}
s_MessageRenderer* messagerenderer = static_cast<s_MessageRenderer*>(messagerenderer_obj);
return (*messagerenderer->cppobj);
}
} // namespace python
} // namespace dns
} // namespace isc
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