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/* 1452, Fri 14 Mar 14 (PDT)
1325, Thu 7 Nov 13 (PST)
ip6.c: RubyLibtrace, python version!
python-libtrace: a Python module to make it easy to use libtrace
Copyright (C) 2015 by Nevil Brownlee, U Auckland | WAND
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 3 of the License, or
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, see <http://www.gnu.org/licenses/>.
*/
#include <Python.h>
#include "structmember.h"
#include "libtrace.h"
#include "plt.h"
#include "pv.h"
static void ip6_dealloc(PyObject *self) {
self->ob_type->tp_free((PyObject *)self);
}
static PyObject *ip6_new(PyTypeObject *type, PyObject *args) {
DataObject *arg=NULL; void *data, *l3p; int rem;
PyArg_ParseTuple(args, "O", (PyObject *)&arg);
if (PyObject_IsInstance((PyObject *)arg, (PyObject *)&DataType)) {
data = arg->data; l3p = arg->l3p; rem = arg->rem;
if (((uint8_t *)l3p)[0] >> 4 != 6) { /* Not IPv6 */
PyObject *result = Py_None; Py_INCREF(result); return result;
}
}
else if (PyByteArray_CheckExact(arg)) {
data = NULL;
l3p = PyByteArray_AsString((PyObject *)arg);
rem = (int)PyByteArray_Size((PyObject *)arg);
}
else {
PyErr_SetString(PyExc_ValueError,
"Not a Data, Packet or ByteArray object"); return NULL;
}
Py_INCREF(arg);
DataObject *ip6_obj = plt_new_object(&Ip6Type,
RLT_TYPE_IP6, RLT_KIND_CPY, data, (PyObject *)arg,
NULL, 0, 0, 0x86DD, 0, l3p, rem, 0, l3p, rem);
// pltData_dump(ip6_obj, "*leaving plt.ip6()"); //debug
return (PyObject *)ip6_obj;
}
static int ip6_init(DataObject *self, PyObject *args) {
return 0;
}
static libtrace_ip6_t *get_ip6(DataObject *op, int x6) {
if (!op->l3p) return NULL;
libtrace_ip6_t *l6p = op->l3p;
int l3p_len = op->l3_rem;
if (l3p_len < x6) return NULL;
return l6p;
}
static PyObject *get_flow_label(DataObject *self, void *closure) {
libtrace_ip6_t *l6p = get_ip6(self, 4);
if (!l6p) {
PyErr_SetString(PyExc_ValueError,
"Data too short for flow_label"); return NULL;
}
uint32_t flow = ntohl(l6p->flow);
return PV_PyInt_FromLong((long)flow & 0x000FFFFF);
}
set_read_only(flow_label);
static PyObject *get_payload_len(DataObject *self, void *closure) {
libtrace_ip6_t *l6p = get_ip6(self, 7);
if (!l6p) {
PyErr_SetString(PyExc_ValueError,
"Data too short for payload_len"); return NULL;
}
return PV_PyInt_FromLong((long)ntohs(l6p->plen));
}
set_read_only(payload_len);
static PyObject *get_next_hdr(DataObject *self, void *closure) {
libtrace_ip6_t *l6p = get_ip6(self, 7);
if (!l6p) {
PyErr_SetString(PyExc_ValueError,
"Data too short for next_hdr"); return NULL;
}
return PV_PyInt_FromLong((long)l6p->nxt);
}
set_read_only(next_hdr);
static PyObject *get_payload(DataObject *self, void *closure) {
libtrace_ip6_t *lip6 = (libtrace_ip6_t *)self->l3p;
uint8_t proto; uint32_t remaining = self->l3_rem;
uint8_t *dp = trace_get_payload_from_ip6(lip6, &proto, &remaining);
if (!dp) {
PyErr_SetString(PyExc_ValueError,
"Data too short for IPv6 payload"); return NULL;
}
PyObject *result; /* Zero-length byte array is OK */
result = PyByteArray_FromStringAndSize((char *)dp, remaining);
if (result == NULL) return NULL;
return result;
}
set_read_only(payload);
static PyGetSetDef IP6_getseters[] = {
{"flow_label",
(getter)get_flow_label, (setter)set_flow_label,
"IP packet ID", NULL},
{"payload_len",
(getter)get_payload_len, (setter)set_payload_len,
"IP Reserved flag", NULL},
{"next_hdr",
(getter)get_next_hdr, (setter)set_next_hdr,
"IP Don't Fragment flag", NULL},
{"payload",
(getter)get_payload, (setter)set_payload,
"IP payload", NULL},
{NULL}, /* Sentinel */
};
static PyMethodDef ip6_methods[] = {
// {"version", (PyCFunction)ip6_version, METH_NOARGS,
// "Ip6 Version" },
{NULL} /* Sentinel */
};
PyTypeObject Ip6Type = {
PV_PyObject_HEAD_INIT
"Ip6Object", /*tp_name*/
sizeof(DataObject), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)ip6_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro (setattr works, this doesn't) */
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"PythonLibtrace IP6", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
ip6_methods, /* tp_methods */
0, /* tp_members */
IP6_getseters, /* tp_getset */
&InternetType, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)ip6_init, /* tp_init */
0, /* tp_alloc */
(newfunc)ip6_new, /* tp_new */
};
void initip6(void) {
if (PyType_Ready(&Ip6Type) < 0) return;
Py_TYPE(&Ip6Type) = &PyType_Type;
Py_INCREF(&Ip6Type);
PyModule_AddObject(plt_module, "ip6", (PyObject *)&Ip6Type);
}
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