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79 lines
2.6 KiB
79 lines
2.6 KiB
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <sys/system_properties.h>
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#include <iostream>
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#include <android-base/properties.h>
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#include <android-base/strings.h>
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using android::base::SetProperty;
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using android::base::StartsWith;
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extern "C" int setprop_main(int argc, char** argv) {
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if (argc != 3) {
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std::cout << "usage: setprop NAME VALUE\n"
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"\n"
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"Sets an Android system property."
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<< std::endl;
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return EXIT_FAILURE;
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}
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auto name = std::string{argv[1]};
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auto value = std::string{argv[2]};
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// SetProperty() doesn't tell us why it failed, and actually can't recognize most failures, so
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// we duplicate some of init's checks here to help the user.
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if (name.front() == '.' || name.back() == '.') {
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std::cerr << "Property names must not start or end with a '.'" << std::endl;
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return EXIT_FAILURE;
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}
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if (name.find("..") != std::string::npos) {
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std::cerr << "'..' is not allowed in a property name" << std::endl;
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return EXIT_FAILURE;
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}
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for (const auto& c : name) {
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if (!isalnum(c) && !strchr(":@_.-", c)) {
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std::cerr << "Invalid character '" << c << "' in name '" << name << "'" << std::endl;
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return EXIT_FAILURE;
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}
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}
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if (value.size() >= PROP_VALUE_MAX && !StartsWith(value, "ro.")) {
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std::cerr << "Value '" << value << "' is too long, " << value.size()
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<< " bytes vs a max of " << PROP_VALUE_MAX << std::endl;
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return EXIT_FAILURE;
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}
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if (mbstowcs(nullptr, value.data(), 0) == static_cast<std::size_t>(-1)) {
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std::cerr << "Value '" << value << "' is not a UTF8 encoded string" << std::endl;
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return EXIT_FAILURE;
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}
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if (!SetProperty(name, value)) {
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std::cerr << "Failed to set property '" << name << "' to '" << value
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<< "'.\nSee dmesg for error reason." << std::endl;
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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} |