view contrib/fuzz/fncache.cc @ 51711:832a1aeb576f

pytype: only try the hacky way of finding PYTHON if not provided

This allows us to work in more environments, like when using pyenv. This
syntax is compatible with all POSIX shells.

#include <Python.h>
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>

#include "pyutil.h"

#include <iostream>
#include <string>

extern "C" {

static PYCODETYPE *code;

extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv)
{
	contrib::initpy(*argv[0]);
	code = (PYCODETYPE *)Py_CompileString(R"py(
try:
    for fn in (
        parsers.isasciistr,
        parsers.asciilower,
        parsers.asciiupper,
        parsers.encodedir,
        parsers.pathencode,
        parsers.lowerencode,
    ):
        try:
            fn(data)
        except UnicodeDecodeError:
            pass  # some functions emit this exception
        except AttributeError:
            # pathencode needs hashlib, which fails to import because the time
            # module fails to import. We should try and fix that some day, but
            # for now we at least get coverage on non-hashencoded codepaths.
            if fn != pathencode:
                raise
        # uncomment this for debugging exceptions
        # except Exception as e:
        #     raise Exception('%r: %r' % (fn, e))
except Exception as e:
    pass
    # uncomment this print if you're editing this Python code
    # to debug failures.
    # print(e)
)py",
	                                      "fuzzer", Py_file_input);
	if (!code) {
		std::cerr << "failed to compile Python code!" << std::endl;
	}
	return 0;
}

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
	PyObject *mtext =
	    PyBytes_FromStringAndSize((const char *)Data, (Py_ssize_t)Size);
	PyObject *locals = PyDict_New();
	PyDict_SetItemString(locals, "data", mtext);
	PyObject *res = PyEval_EvalCode(code, contrib::pyglobals(), locals);
	if (!res) {
		PyErr_Print();
	}
	Py_XDECREF(res);
	Py_DECREF(locals);
	Py_DECREF(mtext);
	return 0; // Non-zero return values are reserved for future use.
}
}