273 lines
11 KiB
C++
273 lines
11 KiB
C++
/*
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* Copyright (C) 2021 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 <binder_rpc_unstable.hpp>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include <android/binder_libbinder.h>
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#include <binder/RpcServer.h>
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#include <binder/RpcSession.h>
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#include <cutils/sockets.h>
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#include <linux/vm_sockets.h>
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using android::OK;
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using android::RpcServer;
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using android::RpcSession;
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using android::sp;
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using android::status_t;
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using android::statusToString;
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using android::base::unique_fd;
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// Opaque handle for RpcServer.
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struct ARpcServer {};
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// Opaque handle for RpcSession.
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struct ARpcSession {};
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template <typename A, typename T>
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static A* createObjectHandle(sp<T>& server) {
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auto ref = server.get();
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ref->incStrong(ref);
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return reinterpret_cast<A*>(ref);
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}
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template <typename T, typename A>
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static void freeObjectHandle(A* handle) {
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LOG_ALWAYS_FATAL_IF(handle == nullptr, "Handle cannot be null");
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auto ref = reinterpret_cast<T*>(handle);
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ref->decStrong(ref);
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}
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template <typename T, typename A>
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static sp<T> handleToStrongPointer(A* handle) {
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LOG_ALWAYS_FATAL_IF(handle == nullptr, "Handle cannot be null");
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auto ref = reinterpret_cast<T*>(handle);
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return sp<T>::fromExisting(ref);
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}
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RpcSession::FileDescriptorTransportMode toTransportMode(
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ARpcSession_FileDescriptorTransportMode mode) {
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switch (mode) {
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case ARpcSession_FileDescriptorTransportMode::None:
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return RpcSession::FileDescriptorTransportMode::NONE;
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case ARpcSession_FileDescriptorTransportMode::Unix:
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return RpcSession::FileDescriptorTransportMode::UNIX;
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case ARpcSession_FileDescriptorTransportMode::Trusty:
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return RpcSession::FileDescriptorTransportMode::TRUSTY;
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default:
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return RpcSession::FileDescriptorTransportMode::NONE;
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}
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}
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extern "C" {
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ARpcServer* ARpcServer_newVsock(AIBinder* service, unsigned int cid, unsigned int port) {
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auto server = RpcServer::make();
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unsigned int bindCid = VMADDR_CID_ANY; // bind to the remote interface
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if (cid == VMADDR_CID_LOCAL) {
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bindCid = VMADDR_CID_LOCAL; // bind to the local interface
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cid = VMADDR_CID_ANY; // no need for a connection filter
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}
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if (status_t status = server->setupVsockServer(bindCid, port); status != OK) {
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LOG(ERROR) << "Failed to set up vsock server with port " << port
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<< " error: " << statusToString(status).c_str();
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return nullptr;
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}
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if (cid != VMADDR_CID_ANY) {
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server->setConnectionFilter([=](const void* addr, size_t addrlen) {
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LOG_ALWAYS_FATAL_IF(addrlen < sizeof(sockaddr_vm), "sockaddr is truncated");
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const sockaddr_vm* vaddr = reinterpret_cast<const sockaddr_vm*>(addr);
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LOG_ALWAYS_FATAL_IF(vaddr->svm_family != AF_VSOCK, "address is not a vsock");
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if (cid != vaddr->svm_cid) {
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LOG(ERROR) << "Rejected vsock connection from CID " << vaddr->svm_cid;
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return false;
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}
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return true;
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});
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}
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server->setRootObject(AIBinder_toPlatformBinder(service));
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return createObjectHandle<ARpcServer>(server);
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}
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ARpcServer* ARpcServer_newInitUnixDomain(AIBinder* service, const char* name) {
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auto server = RpcServer::make();
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auto fd = unique_fd(android_get_control_socket(name));
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if (!fd.ok()) {
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LOG(ERROR) << "Failed to get fd for the socket:" << name;
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return nullptr;
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}
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// Control socket fds are inherited from init, so they don't have O_CLOEXEC set.
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// But we don't want any child processes to inherit the socket we are running
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// the server on, so attempt to set the flag now.
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) {
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LOG(WARNING) << "Failed to set CLOEXEC on control socket with name " << name
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<< " error: " << errno;
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}
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if (status_t status = server->setupRawSocketServer(std::move(fd)); status != OK) {
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LOG(ERROR) << "Failed to set up Unix Domain RPC server with name " << name
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<< " error: " << statusToString(status).c_str();
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return nullptr;
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}
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server->setRootObject(AIBinder_toPlatformBinder(service));
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return createObjectHandle<ARpcServer>(server);
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}
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ARpcServer* ARpcServer_newUnixDomainBootstrap(AIBinder* service, int bootstrapFd) {
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auto server = RpcServer::make();
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auto fd = unique_fd(bootstrapFd);
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if (!fd.ok()) {
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LOG(ERROR) << "Invalid bootstrap fd " << bootstrapFd;
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return nullptr;
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}
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if (status_t status = server->setupUnixDomainSocketBootstrapServer(std::move(fd));
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status != OK) {
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LOG(ERROR) << "Failed to set up Unix Domain RPC server with bootstrap fd " << bootstrapFd
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<< " error: " << statusToString(status).c_str();
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return nullptr;
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}
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server->setRootObject(AIBinder_toPlatformBinder(service));
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return createObjectHandle<ARpcServer>(server);
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}
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ARpcServer* ARpcServer_newInet(AIBinder* service, const char* address, unsigned int port) {
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auto server = RpcServer::make();
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if (status_t status = server->setupInetServer(address, port, nullptr); status != OK) {
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LOG(ERROR) << "Failed to set up inet RPC server with address " << address << " and port "
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<< port << " error: " << statusToString(status).c_str();
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return nullptr;
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}
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server->setRootObject(AIBinder_toPlatformBinder(service));
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return createObjectHandle<ARpcServer>(server);
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}
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void ARpcServer_setSupportedFileDescriptorTransportModes(
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ARpcServer* handle, const ARpcSession_FileDescriptorTransportMode modes[],
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size_t modes_len) {
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auto server = handleToStrongPointer<RpcServer>(handle);
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std::vector<RpcSession::FileDescriptorTransportMode> modevec;
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for (size_t i = 0; i < modes_len; i++) {
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modevec.push_back(toTransportMode(modes[i]));
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}
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server->setSupportedFileDescriptorTransportModes(modevec);
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}
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void ARpcServer_start(ARpcServer* handle) {
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handleToStrongPointer<RpcServer>(handle)->start();
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}
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void ARpcServer_join(ARpcServer* handle) {
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handleToStrongPointer<RpcServer>(handle)->join();
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}
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bool ARpcServer_shutdown(ARpcServer* handle) {
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return handleToStrongPointer<RpcServer>(handle)->shutdown();
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}
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void ARpcServer_free(ARpcServer* handle) {
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// Ignore the result of ARpcServer_shutdown - either it had been called
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// earlier, or the RpcServer destructor will panic.
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(void)ARpcServer_shutdown(handle);
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freeObjectHandle<RpcServer>(handle);
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}
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ARpcSession* ARpcSession_new() {
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auto session = RpcSession::make();
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return createObjectHandle<ARpcSession>(session);
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}
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void ARpcSession_free(ARpcSession* handle) {
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freeObjectHandle<RpcSession>(handle);
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}
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AIBinder* ARpcSession_setupVsockClient(ARpcSession* handle, unsigned int cid, unsigned int port) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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if (status_t status = session->setupVsockClient(cid, port); status != OK) {
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LOG(ERROR) << "Failed to set up vsock client with CID " << cid << " and port " << port
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<< " error: " << statusToString(status).c_str();
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return nullptr;
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}
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return AIBinder_fromPlatformBinder(session->getRootObject());
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}
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AIBinder* ARpcSession_setupUnixDomainClient(ARpcSession* handle, const char* name) {
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std::string pathname(name);
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pathname = ANDROID_SOCKET_DIR "/" + pathname;
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auto session = handleToStrongPointer<RpcSession>(handle);
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if (status_t status = session->setupUnixDomainClient(pathname.c_str()); status != OK) {
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LOG(ERROR) << "Failed to set up Unix Domain RPC client with path: " << pathname
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<< " error: " << statusToString(status).c_str();
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return nullptr;
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}
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return AIBinder_fromPlatformBinder(session->getRootObject());
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}
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AIBinder* ARpcSession_setupUnixDomainBootstrapClient(ARpcSession* handle, int bootstrapFd) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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auto fd = unique_fd(dup(bootstrapFd));
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if (!fd.ok()) {
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LOG(ERROR) << "Invalid bootstrap fd " << bootstrapFd;
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return nullptr;
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}
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if (status_t status = session->setupUnixDomainSocketBootstrapClient(std::move(fd));
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status != OK) {
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LOG(ERROR) << "Failed to set up Unix Domain RPC client with bootstrap fd: " << bootstrapFd
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<< " error: " << statusToString(status).c_str();
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return nullptr;
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}
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return AIBinder_fromPlatformBinder(session->getRootObject());
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}
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AIBinder* ARpcSession_setupInet(ARpcSession* handle, const char* address, unsigned int port) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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if (status_t status = session->setupInetClient(address, port); status != OK) {
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LOG(ERROR) << "Failed to set up inet RPC client with address " << address << " and port "
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<< port << " error: " << statusToString(status).c_str();
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return nullptr;
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}
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return AIBinder_fromPlatformBinder(session->getRootObject());
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}
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AIBinder* ARpcSession_setupPreconnectedClient(ARpcSession* handle, int (*requestFd)(void* param),
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void* param) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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auto request = [=] { return unique_fd{requestFd(param)}; };
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if (status_t status = session->setupPreconnectedClient(unique_fd{}, request); status != OK) {
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LOG(ERROR) << "Failed to set up vsock client. error: " << statusToString(status).c_str();
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return nullptr;
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}
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return AIBinder_fromPlatformBinder(session->getRootObject());
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}
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void ARpcSession_setFileDescriptorTransportMode(ARpcSession* handle,
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ARpcSession_FileDescriptorTransportMode mode) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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session->setFileDescriptorTransportMode(toTransportMode(mode));
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}
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void ARpcSession_setMaxIncomingThreads(ARpcSession* handle, size_t threads) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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session->setMaxIncomingThreads(threads);
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}
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void ARpcSession_setMaxOutgoingConnections(ARpcSession* handle, size_t connections) {
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auto session = handleToStrongPointer<RpcSession>(handle);
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session->setMaxOutgoingConnections(connections);
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}
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}
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