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#include <Python.h>
#include "database.h"
#include "log.h"
#include "tracer.h"
PyObject *Err_Base;
/**
* Makes a C string from a Python unicode or bytes object.
*
* If successful, the result is a string that the caller must free().
* Else, returns NULL.
*/
static char *get_string(PyObject *obj)
{
if(PyUnicode_Check(obj))
{
const char *str;
PyObject *pyutf8 = PyUnicode_AsUTF8String(obj);
if(pyutf8 == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
str = PyBytes_AsString(pyutf8);
#else
str = PyString_AsString(pyutf8);
#endif
if(str == NULL)
return NULL;
{
char *ret = strdup(str);
Py_DECREF(pyutf8);
return ret;
}
}
else if(
#if PY_MAJOR_VERSION >= 3
PyBytes_Check(obj)
#else
PyString_Check(obj)
#endif
)
{
const char *str;
#if PY_MAJOR_VERSION >= 3
str = PyBytes_AsString(obj);
#else
str = PyString_AsString(obj);
#endif
if(str == NULL)
return NULL;
return strdup(str);
}
else
return NULL;
}
static PyObject *pytracer_execute(PyObject *self, PyObject *args)
{
PyObject *ret = NULL;
int exit_status;
char *binary = NULL, *databasepath = NULL;
char **argv = NULL;
size_t argv_len;
PyObject *py_binary, *py_argv, *py_databasepath;
if(log_setup() != 0)
{
/* LCOV_EXCL_START : Can't fail unless Python is in a broken state */
PyErr_SetString(Err_Base, "Error occurred");
return NULL;
/* LCOV_EXCL_STOP */
}
/* Reads arguments */
if(!PyArg_ParseTuple(args, "OO!O",
&py_binary,
&PyList_Type, &py_argv,
&py_databasepath))
return NULL;
binary = get_string(py_binary);
if(binary == NULL)
goto done;
databasepath = get_string(py_databasepath);
if(databasepath == NULL)
goto done;
/* Converts argv from Python list to char[][] */
{
size_t i;
int bad = 0;
argv_len = PyList_Size(py_argv);
argv = malloc((argv_len + 1) * sizeof(char*));
for(i = 0; i < argv_len; ++i)
{
PyObject *arg = PyList_GetItem(py_argv, i);
char *str = get_string(arg);
if(str == NULL)
{
bad = 1;
break;
}
argv[i] = str;
}
if(bad)
{
size_t j;
for(j = 0; j < i; ++j)
free(argv[j]);
free(argv);
argv = NULL;
goto done;
}
argv[argv_len] = NULL;
}
if(fork_and_trace(binary, argv_len, argv, databasepath, &exit_status) == 0)
{
ret = PyLong_FromLong(exit_status);
}
else
{
PyErr_SetString(Err_Base, "Error occurred");
ret = NULL;
}
done:
free(binary);
free(databasepath);
/* Deallocs argv */
if(argv)
{
size_t i;
for(i = 0; i < argv_len; ++i)
free(argv[i]);
free(argv);
}
return ret;
}
static PyMethodDef methods[] = {
{"execute", pytracer_execute, METH_VARARGS,
"execute(binary, argv, databasepath)\n"
"\n"
"Runs the specified binary with the argument list argv under trace and "
"writes\nthe captured events to SQLite3 database databasepath."},
{ NULL, NULL, 0, NULL }
};
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
"reprozip._pytracer", /* m_name */
"C interface to tracer", /* m_doc */
-1, /* m_size */
methods, /* m_methods */
NULL, /* m_reload */
NULL, /* m_traverse */
NULL, /* m_clear */
NULL, /* m_free */
};
#endif
#if PY_MAJOR_VERSION >= 3
PyMODINIT_FUNC PyInit__pytracer(void)
#else
PyMODINIT_FUNC init_pytracer(void)
#endif
{
PyObject *mod;
#if PY_MAJOR_VERSION >= 3
mod = PyModule_Create(&moduledef);
#else
mod = Py_InitModule("reprozip._pytracer", methods);
#endif
if(mod == NULL)
{
#if PY_MAJOR_VERSION >= 3
return NULL;
#else
return;
#endif
}
Err_Base = PyErr_NewException("_pytracer.Error", NULL, NULL);
Py_INCREF(Err_Base);
PyModule_AddObject(mod, "Error", Err_Base);
#if PY_MAJOR_VERSION >= 3
return mod;
#endif
}
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