1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <android-base/logging.h>
18 #include <android-base/unique_fd.h>
19 #include <android/binder_libbinder.h>
20 #include <binder/RpcServer.h>
21 #include <binder/RpcSession.h>
22 #include <linux/vm_sockets.h>
23
24 using android::OK;
25 using android::RpcServer;
26 using android::RpcSession;
27 using android::status_t;
28 using android::statusToString;
29 using android::base::unique_fd;
30
31 extern "C" {
32
RunRpcServerWithFactory(AIBinder * (* factory)(unsigned int cid,void * context),void * factoryContext,unsigned int port)33 bool RunRpcServerWithFactory(AIBinder* (*factory)(unsigned int cid, void* context),
34 void* factoryContext, unsigned int port) {
35 auto server = RpcServer::make();
36 if (status_t status = server->setupVsockServer(port); status != OK) {
37 LOG(ERROR) << "Failed to set up vsock server with port " << port
38 << " error: " << statusToString(status).c_str();
39 return false;
40 }
41 server->setPerSessionRootObject([=](const sockaddr* addr, socklen_t addrlen) {
42 LOG_ALWAYS_FATAL_IF(addr->sa_family != AF_VSOCK, "address is not a vsock");
43 LOG_ALWAYS_FATAL_IF(addrlen < sizeof(sockaddr_vm), "sockaddr is truncated");
44 const sockaddr_vm* vaddr = reinterpret_cast<const sockaddr_vm*>(addr);
45 return AIBinder_toPlatformBinder(factory(vaddr->svm_cid, factoryContext));
46 });
47
48 server->join();
49
50 // Shutdown any open sessions since server failed.
51 (void)server->shutdown();
52 return true;
53 }
54
RunRpcServerCallback(AIBinder * service,unsigned int port,void (* readyCallback)(void * param),void * param)55 bool RunRpcServerCallback(AIBinder* service, unsigned int port, void (*readyCallback)(void* param),
56 void* param) {
57 auto server = RpcServer::make();
58 if (status_t status = server->setupVsockServer(port); status != OK) {
59 LOG(ERROR) << "Failed to set up vsock server with port " << port
60 << " error: " << statusToString(status).c_str();
61 return false;
62 }
63 server->setRootObject(AIBinder_toPlatformBinder(service));
64
65 if (readyCallback) readyCallback(param);
66 server->join();
67
68 // Shutdown any open sessions since server failed.
69 (void)server->shutdown();
70 return true;
71 }
72
RunRpcServer(AIBinder * service,unsigned int port)73 bool RunRpcServer(AIBinder* service, unsigned int port) {
74 return RunRpcServerCallback(service, port, nullptr, nullptr);
75 }
76
RpcClient(unsigned int cid,unsigned int port)77 AIBinder* RpcClient(unsigned int cid, unsigned int port) {
78 auto session = RpcSession::make();
79 if (status_t status = session->setupVsockClient(cid, port); status != OK) {
80 LOG(ERROR) << "Failed to set up vsock client with CID " << cid << " and port " << port
81 << " error: " << statusToString(status).c_str();
82 return nullptr;
83 }
84 return AIBinder_fromPlatformBinder(session->getRootObject());
85 }
86
RpcPreconnectedClient(int (* requestFd)(void * param),void * param)87 AIBinder* RpcPreconnectedClient(int (*requestFd)(void* param), void* param) {
88 auto session = RpcSession::make();
89 auto request = [=] { return unique_fd{requestFd(param)}; };
90 if (status_t status = session->setupPreconnectedClient(unique_fd{}, request); status != OK) {
91 LOG(ERROR) << "Failed to set up vsock client. error: " << statusToString(status).c_str();
92 return nullptr;
93 }
94 return AIBinder_fromPlatformBinder(session->getRootObject());
95 }
96 }
97