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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.
*/
#pragma once
#include <binder/IBinder.h>
#include <binder/RpcServer.h>
#include <binder/RpcSession.h>
#include <binder/RpcTransport.h>
#include <binder/unique_fd.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <map>
#include <vector>
#include <lib/tipc/tipc_srv.h>
namespace android {
/**
* This is the Trusty-specific RPC server code.
*/
class RpcServerTrusty final : public virtual RefBase {
public:
// C++ equivalent to tipc_port_acl that uses safe data structures instead of
// raw pointers, except for |extraData| which doesn't have a good
// equivalent.
struct PortAcl {
uint32_t flags;
std::vector<const uuid> uuids;
const void* extraData;
};
/**
* Creates an RPC server listening on the given port and adds it to the
* Trusty handle set at |handleSet|.
*
* The caller is responsible for calling tipc_run_event_loop() to start
* the TIPC event loop after creating one or more services here.
*/
static sp<RpcServerTrusty> make(
tipc_hset* handleSet, std::string&& portName, std::shared_ptr<const PortAcl>&& portAcl,
size_t msgMaxSize,
std::unique_ptr<RpcTransportCtxFactory> rpcTransportCtxFactory = nullptr);
[[nodiscard]] bool setProtocolVersion(uint32_t version) {
return mRpcServer->setProtocolVersion(version);
}
void setSupportedFileDescriptorTransportModes(
const std::vector<RpcSession::FileDescriptorTransportMode>& modes) {
mRpcServer->setSupportedFileDescriptorTransportModes(modes);
}
void setRootObject(const sp<IBinder>& binder) { mRpcServer->setRootObject(binder); }
void setRootObjectWeak(const wp<IBinder>& binder) { mRpcServer->setRootObjectWeak(binder); }
void setPerSessionRootObject(
std::function<sp<IBinder>(wp<RpcSession> session, const void*, size_t)>&& object) {
mRpcServer->setPerSessionRootObject(std::move(object));
}
sp<IBinder> getRootObject() { return mRpcServer->getRootObject(); }
/**
* For debugging!
*/
std::vector<sp<RpcSession>> listSessions() { return mRpcServer->listSessions(); }
private:
// Both this class and RpcServer have multiple non-copyable fields,
// including mPortAcl below which can't be copied because mUuidPtrs
// holds pointers into it
RpcServerTrusty(const RpcServerTrusty&) = delete;
void operator=(const RpcServerTrusty&) = delete;
friend sp<RpcServerTrusty>;
explicit RpcServerTrusty(std::unique_ptr<RpcTransportCtx> ctx, std::string&& portName,
std::shared_ptr<const PortAcl>&& portAcl, size_t msgMaxSize);
// Internal helper that creates the RpcServer.
// This is used both from here and Rust.
static sp<RpcServer> makeRpcServer(std::unique_ptr<RpcTransportCtx> ctx) {
auto rpcServer = sp<RpcServer>::make(std::move(ctx));
// TODO(b/266741352): follow-up to prevent needing this in the future
// Trusty needs to be set to the latest stable version that is in prebuilts there.
LOG_ALWAYS_FATAL_IF(!rpcServer->setProtocolVersion(0));
return rpcServer;
}
// The Rpc-specific context maintained for every open TIPC channel.
struct ChannelContext {
sp<RpcSession> session;
sp<RpcSession::RpcConnection> connection;
};
static int handleConnect(const tipc_port* port, handle_t chan, const uuid* peer, void** ctx_p);
static int handleMessage(const tipc_port* port, handle_t chan, void* ctx);
static void handleDisconnect(const tipc_port* port, handle_t chan, void* ctx);
static void handleChannelCleanup(void* ctx);
static int handleConnectInternal(RpcServer* rpcServer, handle_t chan, const uuid* peer,
void** ctx_p);
static int handleMessageInternal(void* ctx);
static void handleDisconnectInternal(void* ctx);
static constexpr tipc_srv_ops kTipcOps = {
.on_connect = &handleConnect,
.on_message = &handleMessage,
.on_disconnect = &handleDisconnect,
.on_channel_cleanup = &handleChannelCleanup,
};
sp<RpcServer> mRpcServer;
std::string mPortName;
std::shared_ptr<const PortAcl> mPortAcl;
std::vector<const uuid*> mUuidPtrs;
tipc_port_acl mTipcPortAcl;
tipc_port mTipcPort;
};
} // namespace android
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