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/*
* Unix SMB/CIFS implementation.
* Copyright (C) Volker Lendecke 2022
*
* 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
* (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, see <http://www.gnu.org/licenses/>.
*/
#include "lib/replace/system/python.h"
#include "replace.h"
#include "python/modules.h"
#include "python/py3compat.h"
#include "libcli/util/pyerrors.h"
#include "reparse.h"
#include "smb_constants.h"
static PyObject *py_reparse_put(PyObject *module, PyObject *args)
{
char *reparse = NULL;
Py_ssize_t reparse_len;
unsigned long long tag = 0;
unsigned long reserved = 0;
uint8_t *buf = NULL;
ssize_t buflen;
PyObject *result = NULL;
struct reparse_data_buffer reparse_buf = {};
bool ok;
ok = PyArg_ParseTuple(
args,
"Kk"PYARG_BYTES_LEN":put",
&tag,
&reserved,
&reparse,
&reparse_len);
if (!ok) {
return NULL;
}
reparse_buf.tag = tag;
reparse_buf.parsed.raw.data = (uint8_t *)reparse;
reparse_buf.parsed.raw.length = reparse_len;
reparse_buf.parsed.raw.reserved = reserved;
buflen = reparse_data_buffer_marshall(&reparse_buf, NULL, 0);
if (buflen == -1) {
errno = EINVAL;
PyErr_SetFromErrno(PyExc_RuntimeError);
return NULL;
}
buf = talloc_array(NULL, uint8_t, buflen);
if (buf == NULL) {
PyErr_NoMemory();
return NULL;
}
reparse_data_buffer_marshall(&reparse_buf, buf, buflen);
result = PyBytes_FromStringAndSize((char *)buf, buflen);
TALLOC_FREE(buf);
return result;
}
static PyObject *py_reparse_get(PyObject *module, PyObject *args)
{
char *buf = NULL;
Py_ssize_t buflen;
PyObject *result = NULL;
struct reparse_data_buffer *rep = NULL;
bool ok;
NTSTATUS status;
ok = PyArg_ParseTuple(args, PYARG_BYTES_LEN ":get", &buf, &buflen);
if (!ok) {
return NULL;
}
rep = talloc(NULL, struct reparse_data_buffer);
if (rep == NULL) {
PyErr_NoMemory();
return NULL;
}
status = reparse_data_buffer_parse(rep, rep, (uint8_t *)buf, buflen);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(rep);
PyErr_SetNTSTATUS(status);
return NULL;
}
switch (rep->tag) {
case IO_REPARSE_TAG_SYMLINK: {
const struct symlink_reparse_struct *lnk = &rep->parsed.lnk;
result = Py_BuildValue("s(ssII)",
"IO_REPARSE_TAG_SYMLINK",
lnk->substitute_name,
lnk->print_name,
(unsigned)lnk->unparsed_path_length,
(unsigned)lnk->flags);
break;
}
case IO_REPARSE_TAG_NFS: {
const struct nfs_reparse_data_buffer *nfs = &rep->parsed.nfs;
switch (nfs->type) {
case NFS_SPECFILE_LNK:
result = Py_BuildValue("ss",
"NFS_SPECFILE_LNK",
nfs->data.lnk_target);
break;
case NFS_SPECFILE_BLK:
result = Py_BuildValue("sII",
"NFS_SPECFILE_BLK",
(unsigned)nfs->data.dev.major,
(unsigned)nfs->data.dev.minor);
break;
case NFS_SPECFILE_CHR:
result = Py_BuildValue("sII",
"NFS_SPECFILE_CHR",
(unsigned)nfs->data.dev.major,
(unsigned)nfs->data.dev.minor);
break;
case NFS_SPECFILE_FIFO:
result = Py_BuildValue("(s)", "NFS_SPECFILE_FIFO");
break;
case NFS_SPECFILE_SOCK:
result = Py_BuildValue("(s)", "NFS_SPECFILE_SOCK");
break;
}
}
}
if (result == NULL) {
result = Py_BuildValue("Iy#I",
(unsigned)rep->tag,
(const char *)rep->parsed.raw.data,
(Py_ssize_t)rep->parsed.raw.length,
(unsigned)rep->parsed.raw.reserved);
}
TALLOC_FREE(rep);
return result;
}
static PyObject *py_reparse_symlink_put(PyObject *module, PyObject *args)
{
int unparsed = 0;
int flags = 0;
struct reparse_data_buffer reparse = {
.tag = IO_REPARSE_TAG_SYMLINK,
};
struct symlink_reparse_struct *lnk = &reparse.parsed.lnk;
uint8_t stackbuf[1024];
uint8_t *buf = stackbuf;
ssize_t buflen = sizeof(stackbuf);
PyObject *result = NULL;
bool ok;
ok = PyArg_ParseTuple(args,
"ssii:symlink_put",
&lnk->substitute_name,
&lnk->print_name,
&unparsed,
&flags);
if (!ok) {
return NULL;
}
lnk->unparsed_path_length = unparsed;
lnk->flags = flags;
buflen = reparse_data_buffer_marshall(&reparse, buf, buflen);
if ((buflen > 0) && ((size_t)buflen > sizeof(stackbuf))) {
buf = malloc(buflen);
buflen = reparse_data_buffer_marshall(&reparse, buf, buflen);
}
if (buflen == -1) {
PyErr_NoMemory();
} else {
result = PyBytes_FromStringAndSize((char *)buf, buflen);
}
if (buf != stackbuf) {
free(buf);
}
return result;
}
static PyMethodDef py_reparse_symlink_methods[] = {
{ "put",
PY_DISCARD_FUNC_SIG(PyCFunction, py_reparse_put),
METH_VARARGS,
"Create a reparse point blob"},
{ "get",
PY_DISCARD_FUNC_SIG(PyCFunction, py_reparse_get),
METH_VARARGS,
"Parse a reparse point blob"},
{ "symlink_put",
PY_DISCARD_FUNC_SIG(PyCFunction, py_reparse_symlink_put),
METH_VARARGS,
"Create a reparse symlink blob"},
{0},
};
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
.m_name = "reparse_symlink",
.m_doc = "[un]marshall reparse symlink blobs",
.m_size = -1,
.m_methods = py_reparse_symlink_methods,
};
MODULE_INIT_FUNC(reparse_symlink)
{
PyObject *m;
m = PyModule_Create(&moduledef);
if (m == NULL)
return NULL;
return m;
}
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