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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fuzzer/FuzzedDataProvider.h>
#include <stdint.h>
#include <algorithm>
#include <string>
#include <tuple>
#include "base/check.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/ranges/algorithm.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
namespace base {
namespace {
CommandLine::StringType GenerateNativeString(FuzzedDataProvider& provider) {
const std::string raw_string = provider.ConsumeRandomLengthString();
#if BUILDFLAG(IS_WIN)
return UTF8ToWide(raw_string);
#else
return raw_string;
#endif
}
CommandLine::StringVector GenerateNativeStringVector(
FuzzedDataProvider& provider) {
CommandLine::StringVector strings(
provider.ConsumeIntegralInRange<int>(0, 100));
for (auto& item : strings)
item = GenerateNativeString(provider);
return strings;
}
FilePath GenerateFilePath(FuzzedDataProvider& provider) {
return FilePath(GenerateNativeString(provider));
}
bool IsForbiddenSwitchCharacter(char c) {
return IsAsciiWhitespace(c) || c == '=' || c != ToLowerASCII(c);
}
bool IsValidSwitchName(const std::string& text) {
// This duplicates the logic in command_line.cc, but it's not exposed in form
// of public interface.
return !text.empty() && !ranges::any_of(text, IsForbiddenSwitchCharacter) &&
!StartsWith(text, "-") && !StartsWith(text, "/");
}
} // namespace
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
FuzzedDataProvider provider(data, size);
// Create a randomly initialized command line.
CommandLine command_line(CommandLine::NO_PROGRAM);
switch (provider.ConsumeIntegralInRange<int>(0, 3)) {
case 0:
// Leave empty.
break;
case 1:
command_line = CommandLine(GenerateFilePath(provider));
break;
case 2:
command_line = CommandLine(GenerateNativeStringVector(provider));
break;
case 3:
#if BUILDFLAG(IS_WIN)
command_line.ParseFromString(GenerateNativeString(provider));
#endif
break;
}
// Do a few mutations of the command line.
while (provider.remaining_bytes() > 0) {
switch (provider.ConsumeIntegralInRange<int>(0, 4)) {
case 0: {
// Add a switch.
std::string name = provider.ConsumeRandomLengthString();
if (IsValidSwitchName(name)) {
CommandLine::StringType value = GenerateNativeString(provider);
command_line.AppendSwitchNative(name, value);
CHECK(command_line.HasSwitch(name));
CHECK(command_line.GetSwitchValueNative(name) == value);
}
break;
}
case 1: {
// Remove a switch.
std::string name = provider.ConsumeRandomLengthString();
if (IsValidSwitchName(name)) {
command_line.RemoveSwitch(name);
CHECK(!command_line.HasSwitch(name));
CHECK(command_line.GetSwitchValueNative(name).empty());
}
break;
}
case 2: {
// Add an argument.
CommandLine::StringType arg = GenerateNativeString(provider);
if (!arg.empty() && IsStringASCII(arg))
command_line.AppendArgNative(arg);
break;
}
case 3: {
// Add a wrapper.
CommandLine::StringType wrapper = GenerateNativeString(provider);
if (!wrapper.empty())
command_line.PrependWrapper(wrapper);
break;
}
case 4: {
// Check a switch.
std::string name = provider.ConsumeRandomLengthString();
if (IsValidSwitchName(name)) {
std::ignore = command_line.HasSwitch(name);
std::ignore = command_line.GetSwitchValueNative(name);
}
break;
}
}
// Smoke-test various accessors.
std::ignore = command_line.GetCommandLineString();
std::ignore = command_line.GetArgumentsString();
#if BUILDFLAG(IS_WIN)
std::ignore = command_line.GetCommandLineStringForShell();
std::ignore = command_line.GetCommandLineStringWithUnsafeInsertSequences();
#endif
}
return 0;
}
} // namespace base
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