104 lines
4.0 KiB
C++
104 lines
4.0 KiB
C++
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/*
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* Copyright 2022 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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#define LOG_TAG "VirtualizationService"
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#include <android-base/unique_fd.h>
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#include <android/binder_ibinder_jni.h>
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#include <jni.h>
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#include <log/log.h>
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#include <poll.h>
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#include <string>
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#include "common.h"
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using namespace android::base;
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static constexpr const char VIRTMGR_PATH[] = "/apex/com.android.virt/bin/virtmgr";
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static constexpr size_t VIRTMGR_THREADS = 2;
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extern "C" JNIEXPORT jint JNICALL
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Java_android_system_virtualmachine_VirtualizationService_nativeSpawn(
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JNIEnv* env, [[maybe_unused]] jclass clazz) {
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unique_fd serverFd, clientFd;
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if (!Socketpair(SOCK_STREAM, &serverFd, &clientFd)) {
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env->ThrowNew(env->FindClass("android/system/virtualmachine/VirtualMachineException"),
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("Failed to create socketpair: " + std::string(strerror(errno))).c_str());
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return -1;
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}
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unique_fd waitFd, readyFd;
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if (!Pipe(&waitFd, &readyFd, 0)) {
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env->ThrowNew(env->FindClass("android/system/virtualmachine/VirtualMachineException"),
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("Failed to create pipe: " + std::string(strerror(errno))).c_str());
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return -1;
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}
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if (fork() == 0) {
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// Close client's FDs.
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clientFd.reset();
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waitFd.reset();
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auto strServerFd = std::to_string(serverFd.get());
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auto strReadyFd = std::to_string(readyFd.get());
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execl(VIRTMGR_PATH, VIRTMGR_PATH, "--rpc-server-fd", strServerFd.c_str(), "--ready-fd",
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strReadyFd.c_str(), NULL);
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}
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// Close virtmgr's FDs.
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serverFd.reset();
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readyFd.reset();
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// Wait for the server to signal its readiness by closing its end of the pipe.
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char buf;
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if (read(waitFd.get(), &buf, sizeof(buf)) < 0) {
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env->ThrowNew(env->FindClass("android/system/virtualmachine/VirtualMachineException"),
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"Failed to wait for VirtualizationService to be ready");
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return -1;
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}
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return clientFd.release();
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}
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extern "C" JNIEXPORT jobject JNICALL
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Java_android_system_virtualmachine_VirtualizationService_nativeConnect(JNIEnv* env,
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[[maybe_unused]] jobject obj,
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int clientFd) {
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RpcSessionHandle session;
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ARpcSession_setFileDescriptorTransportMode(session.get(),
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ARpcSession_FileDescriptorTransportMode::Unix);
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ARpcSession_setMaxIncomingThreads(session.get(), VIRTMGR_THREADS);
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// SAFETY - ARpcSession_setupUnixDomainBootstrapClient does not take ownership of clientFd.
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auto client = ARpcSession_setupUnixDomainBootstrapClient(session.get(), clientFd);
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return AIBinder_toJavaBinder(env, client);
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}
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extern "C" JNIEXPORT jboolean JNICALL
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Java_android_system_virtualmachine_VirtualizationService_nativeIsOk(JNIEnv* env,
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[[maybe_unused]] jobject obj,
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int clientFd) {
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/* Setting events=0 only returns POLLERR, POLLHUP or POLLNVAL. */
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struct pollfd pfds[] = {{.fd = clientFd, .events = 0}};
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if (poll(pfds, /*nfds*/ 1, /*timeout*/ 0) < 0) {
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env->ThrowNew(env->FindClass("android/system/virtualmachine/VirtualMachineException"),
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("Failed to poll client FD: " + std::string(strerror(errno))).c_str());
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return false;
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}
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return pfds[0].revents == 0;
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}
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