86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
/*
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* Copyright (C) 2018 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 <sys/stat.h>
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#include <sys/syscall.h>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include <modprobe/modprobe.h>
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bool Modprobe::Insmod(const std::string& path_name, const std::string& parameters) {
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android::base::unique_fd fd(
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TEMP_FAILURE_RETRY(open(path_name.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC)));
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if (fd == -1) {
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LOG(ERROR) << "Could not open module '" << path_name << "'";
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return false;
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}
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std::string options = "";
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auto options_iter = module_options_.find(MakeCanonical(path_name));
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if (options_iter != module_options_.end()) {
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options = options_iter->second;
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}
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if (!parameters.empty()) {
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options = options + " " + parameters;
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}
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LOG(INFO) << "Loading module " << path_name << " with args \"" << options << "\"";
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int ret = syscall(__NR_finit_module, fd.get(), options.c_str(), 0);
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if (ret != 0) {
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if (errno == EEXIST) {
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// Module already loaded
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return true;
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}
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LOG(ERROR) << "Failed to insmod '" << path_name << "' with args '" << options << "'";
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return false;
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}
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LOG(INFO) << "Loaded kernel module " << path_name;
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return true;
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}
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bool Modprobe::Rmmod(const std::string& module_name) {
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int ret = syscall(__NR_delete_module, MakeCanonical(module_name).c_str(), O_NONBLOCK);
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if (ret != 0) {
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PLOG(ERROR) << "Failed to remove module '" << module_name << "'";
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return false;
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}
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return true;
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}
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bool Modprobe::ModuleExists(const std::string& module_name) {
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struct stat fileStat;
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if (blacklist_enabled && module_blacklist_.count(module_name)) {
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LOG(INFO) << "module " << module_name << " is blacklisted";
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return false;
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}
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auto deps = GetDependencies(module_name);
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if (deps.empty()) {
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// missing deps can happen in the case of an alias
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return false;
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}
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if (stat(deps.front().c_str(), &fileStat)) {
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LOG(INFO) << "module " << module_name << " does not exist";
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return false;
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}
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if (!S_ISREG(fileStat.st_mode)) {
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LOG(INFO) << "module " << module_name << " is not a regular file";
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return false;
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}
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return true;
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}
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