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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Convert plain qtest traces to C or Bash reproducers
Use this to help build bug-reports or create in-tree reproducers for bugs.
Note: This will not format C code for you. Pipe the output through
clang-format -style="{BasedOnStyle: llvm, IndentWidth: 4, ColumnLimit: 90}"
or similar
"""
import sys
import os
import argparse
import textwrap
from datetime import date
__author__ = "Alexander Bulekov <alxndr@bu.edu>"
__copyright__ = "Copyright (C) 2021, Red Hat, Inc."
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Alexander Bulekov"
__email__ = "alxndr@bu.edu"
def c_header(owner):
return """/*
* Autogenerated Fuzzer Test Case
*
* Copyright (c) {date} {owner}
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "libqos/libqtest.h"
""".format(date=date.today().year, owner=owner)
def c_comment(s):
""" Return a multi-line C comment. Assume the text is already wrapped """
return "/*\n * " + "\n * ".join(s.splitlines()) + "\n*/"
def print_c_function(s):
print("/* ")
for l in s.splitlines():
print(" * {}".format(l))
def bash_reproducer(path, args, trace):
result = '\\\n'.join(textwrap.wrap("cat << EOF | {} {}".format(path, args),
72, break_on_hyphens=False,
drop_whitespace=False))
for l in trace.splitlines():
result += "\n" + '\\\n'.join(textwrap.wrap(l,72,drop_whitespace=False))
result += "\nEOF"
return result
def c_reproducer(name, args, trace):
result = []
result.append("""static void {}(void)\n{{""".format(name))
# libqtest will add its own qtest args, so get rid of them
args = args.replace("-accel qtest","")
args = args.replace(",accel=qtest","")
args = args.replace("-machine accel=qtest","")
args = args.replace("-qtest stdio","")
result.append("""QTestState *s = qtest_init("{}");""".format(args))
for l in trace.splitlines():
param = l.split()
cmd = param[0]
if cmd == "write":
buf = param[3][2:] #Get the 0x... buffer and trim the "0x"
assert len(buf)%2 == 0
bufbytes = [buf[i:i+2] for i in range(0, len(buf), 2)]
bufstring = '\\x'+'\\x'.join(bufbytes)
addr = param[1]
size = param[2]
result.append("""qtest_bufwrite(s, {}, "{}", {});""".format(
addr, bufstring, size))
elif cmd.startswith("in") or cmd.startswith("read"):
result.append("qtest_{}(s, {});".format(
cmd, param[1]))
elif cmd.startswith("out") or cmd.startswith("write"):
result.append("qtest_{}(s, {}, {});".format(
cmd, param[1], param[2]))
elif cmd == "clock_step":
if len(param) ==1:
result.append("qtest_clock_step_next(s);")
else:
result.append("qtest_clock_step(s, {});".format(param[1]))
result.append("qtest_quit(s);\n}")
return "\n".join(result)
def c_main(name, arch):
return """int main(int argc, char **argv)
{{
const char *arch = qtest_get_arch();
g_test_init(&argc, &argv, NULL);
if (strcmp(arch, "{arch}") == 0) {{
qtest_add_func("fuzz/{name}",{name});
}}
return g_test_run();
}}""".format(name=name, arch=arch)
def main():
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument("-bash", help="Only output a copy-pastable bash command",
action="store_true")
group.add_argument("-c", help="Only output a c function",
action="store_true")
parser.add_argument('-owner', help="If generating complete C source code, \
this specifies the Copyright owner",
nargs='?', default="<name of author>")
parser.add_argument("-no_comment", help="Don't include a bash reproducer \
as a comment in the C reproducers",
action="store_true")
parser.add_argument('-name', help="The name of the c function",
nargs='?', default="test_fuzz")
parser.add_argument('input_trace', help="input QTest command sequence \
(stdin by default)",
nargs='?', type=argparse.FileType('r'),
default=sys.stdin)
args = parser.parse_args()
qemu_path = os.getenv("QEMU_PATH")
qemu_args = os.getenv("QEMU_ARGS")
if not qemu_args or not qemu_path:
print("Please set QEMU_PATH and QEMU_ARGS environment variables")
sys.exit(1)
bash_args = qemu_args
if " -qtest stdio" not in qemu_args:
bash_args += " -qtest stdio"
arch = qemu_path.split("-")[-1]
trace = args.input_trace.read().strip()
if args.bash :
print(bash_reproducer(qemu_path, bash_args, trace))
else:
output = ""
if not args.c:
output += c_header(args.owner) + "\n"
if not args.no_comment:
output += c_comment(bash_reproducer(qemu_path, bash_args, trace))
output += c_reproducer(args.name, qemu_args, trace)
if not args.c:
output += c_main(args.name, arch)
print(output)
if __name__ == '__main__':
main()
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