blob: 2efaeeafabb2084a70e8edfe99a2a7e8b715a2d5 [file] [log] [blame]
/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Note that these check functions cannot check expanded arguments from properties, since they will
// not know what those properties would be at runtime. They will be passed an empty string in the
// situation that the input line had a property expansion without a default value, since an empty
// string is otherwise an impossible value. They should therefore disregard checking empty
// arguments.
#include "check_builtins.h"
#include <sys/time.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include "builtin_arguments.h"
#include "interface_utils.h"
#include "rlimit_parser.h"
#include "service.h"
#include "util.h"
using android::base::ParseInt;
using android::base::StartsWith;
#define ReturnIfAnyArgsEmpty() \
for (const auto& arg : args) { \
if (arg.empty()) { \
return {}; \
} \
}
namespace android {
namespace init {
Result<void> check_chown(const BuiltinArguments& args) {
if (!args[1].empty()) {
auto uid = DecodeUid(args[1]);
if (!uid) {
return Error() << "Unable to decode UID for '" << args[1] << "': " << uid.error();
}
}
// GID is optional and pushes the index of path out by one if specified.
if (args.size() == 4 && !args[2].empty()) {
auto gid = DecodeUid(args[2]);
if (!gid) {
return Error() << "Unable to decode GID for '" << args[2] << "': " << gid.error();
}
}
return {};
}
Result<void> check_exec(const BuiltinArguments& args) {
ReturnIfAnyArgsEmpty();
auto result = Service::MakeTemporaryOneshotService(args.args);
if (!result) {
return result.error();
}
return {};
}
Result<void> check_exec_background(const BuiltinArguments& args) {
return check_exec(std::move(args));
}
Result<void> check_exec_reboot_on_failure(const BuiltinArguments& args) {
BuiltinArguments remaining_args(args.context);
remaining_args.args = std::vector<std::string>(args.begin() + 1, args.end());
remaining_args.args[0] = args[0];
return check_exec(remaining_args);
}
Result<void> check_interface_restart(const BuiltinArguments& args) {
if (auto result = IsKnownInterface(args[1]); !result) {
return result.error();
}
return {};
}
Result<void> check_interface_start(const BuiltinArguments& args) {
return check_interface_restart(std::move(args));
}
Result<void> check_interface_stop(const BuiltinArguments& args) {
return check_interface_restart(std::move(args));
}
Result<void> check_load_system_props(const BuiltinArguments& args) {
return Error() << "'load_system_props' is deprecated";
}
Result<void> check_loglevel(const BuiltinArguments& args) {
ReturnIfAnyArgsEmpty();
int log_level = -1;
ParseInt(args[1], &log_level);
if (log_level < 0 || log_level > 7) {
return Error() << "loglevel must be in the range of 0-7";
}
return {};
}
Result<void> check_mkdir(const BuiltinArguments& args) {
if (args.size() >= 4) {
if (!args[3].empty()) {
auto uid = DecodeUid(args[3]);
if (!uid) {
return Error() << "Unable to decode UID for '" << args[3] << "': " << uid.error();
}
}
if (args.size() == 5 && !args[4].empty()) {
auto gid = DecodeUid(args[4]);
if (!gid) {
return Error() << "Unable to decode GID for '" << args[4] << "': " << gid.error();
}
}
}
return {};
}
Result<void> check_restorecon(const BuiltinArguments& args) {
ReturnIfAnyArgsEmpty();
auto restorecon_info = ParseRestorecon(args.args);
if (!restorecon_info) {
return restorecon_info.error();
}
return {};
}
Result<void> check_restorecon_recursive(const BuiltinArguments& args) {
return check_restorecon(std::move(args));
}
Result<void> check_setprop(const BuiltinArguments& args) {
const std::string& name = args[1];
if (name.empty()) {
return {};
}
const std::string& value = args[2];
if (!IsLegalPropertyName(name)) {
return Error() << "'" << name << "' is not a legal property name";
}
if (!value.empty()) {
if (auto result = IsLegalPropertyValue(name, value); !result) {
return result.error();
}
}
if (StartsWith(name, "ctl.")) {
return Error()
<< "Do not set ctl. properties from init; call the Service functions directly";
}
static constexpr const char kRestoreconProperty[] = "selinux.restorecon_recursive";
if (name == kRestoreconProperty) {
return Error() << "Do not set '" << kRestoreconProperty
<< "' from init; use the restorecon builtin directly";
}
return {};
}
Result<void> check_setrlimit(const BuiltinArguments& args) {
ReturnIfAnyArgsEmpty();
auto rlimit = ParseRlimit(args.args);
if (!rlimit) return rlimit.error();
return {};
}
Result<void> check_sysclktz(const BuiltinArguments& args) {
ReturnIfAnyArgsEmpty();
struct timezone tz = {};
if (!android::base::ParseInt(args[1], &tz.tz_minuteswest)) {
return Error() << "Unable to parse mins_west_of_gmt";
}
return {};
}
Result<void> check_wait(const BuiltinArguments& args) {
if (args.size() == 3 && !args[2].empty()) {
int timeout_int;
if (!android::base::ParseInt(args[2], &timeout_int)) {
return Error() << "failed to parse timeout";
}
}
return {};
}
Result<void> check_wait_for_prop(const BuiltinArguments& args) {
return check_setprop(std::move(args));
}
} // namespace init
} // namespace android