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/*
* 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.
*/
#include <ctype.h>
#include <stdlib.h>
#include <sys/system_properties.h>
#include <iostream>
#include <android-base/properties.h>
#include <android-base/strings.h>
using android::base::SetProperty;
using android::base::StartsWith;
extern "C" int setprop_main(int argc, char** argv) {
if (argc != 3) {
std::cout << "usage: setprop NAME VALUE\n"
"\n"
"Sets an Android system property."
<< std::endl;
return EXIT_FAILURE;
}
auto name = std::string{argv[1]};
auto value = std::string{argv[2]};
// SetProperty() doesn't tell us why it failed, and actually can't recognize most failures, so
// we duplicate some of init's checks here to help the user.
if (name.front() == '.' || name.back() == '.') {
std::cerr << "Property names must not start or end with a '.'" << std::endl;
return EXIT_FAILURE;
}
if (name.find("..") != std::string::npos) {
std::cerr << "'..' is not allowed in a property name" << std::endl;
return EXIT_FAILURE;
}
for (const auto& c : name) {
if (!isalnum(c) && !strchr(":@_.-", c)) {
std::cerr << "Invalid character '" << c << "' in name '" << name << "'" << std::endl;
return EXIT_FAILURE;
}
}
if (value.size() >= PROP_VALUE_MAX && !StartsWith(value, "ro.")) {
std::cerr << "Value '" << value << "' is too long, " << value.size()
<< " bytes vs a max of " << PROP_VALUE_MAX << std::endl;
return EXIT_FAILURE;
}
if (mbstowcs(nullptr, value.data(), 0) == static_cast<std::size_t>(-1)) {
std::cerr << "Value '" << value << "' is not a UTF8 encoded string" << std::endl;
return EXIT_FAILURE;
}
if (!SetProperty(name, value)) {
std::cerr << "Failed to set property '" << name << "' to '" << value
<< "'.\nSee dmesg for error reason." << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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