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/*
* Copyright (C) 2022 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 <getopt.h>
#include <unistd.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <bootloader_message/bootloader_message.h>
#include <functional>
#include <iostream>
void PrintUsage(const char* progname) {
std::cerr << "USAGE: " << progname << " get [PROPERTY]" << std::endl;
std::cerr << " " << progname << " store [PROPERTY] [VALUE]" << std::endl;
std::cerr << " " << progname << " update-props" << std::endl;
}
int UpdateProps() {
misc_kcmdline_message m = {.version = MISC_KCMDLINE_MESSAGE_VERSION,
.magic = MISC_KCMDLINE_MAGIC_HEADER};
std::string err;
if (!ReadMiscKcmdlineMessage(&m, &err)) {
LOG(ERROR) << "Failed to read from misc: " << err;
return 1;
}
// If invalid, treat it as-if all flags are zero.
if (m.magic != MISC_KCMDLINE_MAGIC_HEADER || m.version != MISC_KCMDLINE_MESSAGE_VERSION) {
m = {.version = MISC_KCMDLINE_MESSAGE_VERSION,
.magic = MISC_KCMDLINE_MAGIC_HEADER,
.kcmdline_flags = 0};
}
bool use_rust_binder = (m.kcmdline_flags & MISC_KCMDLINE_BINDER_RUST) != 0;
android::base::SetProperty("kcmdline.binder", use_rust_binder ? "rust" : "c");
android::base::SetProperty("kcmdline.loaded", "1");
return 0;
}
int PrintProperty(const char* property_name) {
misc_kcmdline_message m = {.version = MISC_KCMDLINE_MESSAGE_VERSION,
.magic = MISC_KCMDLINE_MAGIC_HEADER};
std::string err;
if (!ReadMiscKcmdlineMessage(&m, &err)) {
LOG(ERROR) << "Failed to read from misc: " << err;
return 1;
}
if (m.magic != MISC_KCMDLINE_MAGIC_HEADER || m.version != MISC_KCMDLINE_MESSAGE_VERSION) {
std::cout << "kcmdline message is invalid, treating all flags as zero" << std::endl;
m = {.version = MISC_KCMDLINE_MESSAGE_VERSION,
.magic = MISC_KCMDLINE_MAGIC_HEADER,
.kcmdline_flags = 0};
}
if (!strcmp(property_name, "binder")) {
bool use_rust_binder = (m.kcmdline_flags & MISC_KCMDLINE_BINDER_RUST) != 0;
const char* binder_value = use_rust_binder ? "rust" : "c";
std::cout << "binder=" << binder_value << std::endl;
return 0;
} else {
LOG(ERROR) << "Unknown property name: " << property_name;
return 1;
}
}
int StoreProperty(const char* property_name, const char* new_value) {
misc_kcmdline_message m = {.version = MISC_KCMDLINE_MESSAGE_VERSION,
.magic = MISC_KCMDLINE_MAGIC_HEADER};
std::string err;
if (!ReadMiscKcmdlineMessage(&m, &err)) {
LOG(ERROR) << "Failed to read from misc: " << err;
return 1;
}
if (m.magic != MISC_KCMDLINE_MAGIC_HEADER || m.version != MISC_KCMDLINE_MESSAGE_VERSION) {
std::cout << "kcmdline message is invalid, resetting it" << std::endl;
m = {.version = MISC_KCMDLINE_MESSAGE_VERSION,
.magic = MISC_KCMDLINE_MAGIC_HEADER,
.kcmdline_flags = 0};
}
if (!strcmp(property_name, "binder")) {
if (!strcmp(new_value, "rust")) {
m.kcmdline_flags |= MISC_KCMDLINE_BINDER_RUST;
} else if (!strcmp(new_value, "c")) {
m.kcmdline_flags &= !MISC_KCMDLINE_BINDER_RUST;
} else {
LOG(ERROR) << "Binder property can only be 'c' or 'rust', but got " << new_value;
return 1;
}
} else {
LOG(ERROR) << "Unknown property name: " << property_name;
return 1;
}
if (!WriteMiscKcmdlineMessage(m, &err)) {
LOG(ERROR) << "Failed to write to misc: " << err;
return 1;
}
return 0;
}
int main(int argc, char** argv) {
char *action, *property_name, *new_value;
if (argc == 2) {
action = argv[1];
property_name = NULL;
new_value = NULL;
} else if (argc == 3) {
action = argv[1];
property_name = argv[2];
new_value = NULL;
} else if (argc == 4) {
action = argv[1];
property_name = argv[2];
new_value = argv[3];
} else {
PrintUsage(*argv);
return 1;
}
if (!strcmp(action, "update-props") && property_name == NULL) {
return UpdateProps();
} else if (!strcmp(action, "get") && property_name != NULL && new_value == NULL) {
return PrintProperty(property_name);
} else if (!strcmp(action, "store") && property_name != NULL && new_value != NULL) {
return StoreProperty(property_name, new_value);
} else {
PrintUsage(*argv);
return 1;
}
}
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