libbinder: build on Trusty
Adds a new trusty/ subdirectory containing all the files
needed to build Binder RPC on Trusty, including:
* A RpcServerTrusty class used to create Trusty Binder services
* The underlying RpcTransportTipcTrusty transport that interfaces
between libbinder and TIPC
* Trusty implementations of some OS-specific functionality, like logging
* Make-based build file for libbinder in the Trusty build system
Bug: 224644083
Test: build Trusty
Change-Id: I25b97736d41489d20c2dd266e8e110764215378c
diff --git a/libs/binder/trusty/RpcServerTrusty.cpp b/libs/binder/trusty/RpcServerTrusty.cpp
new file mode 100644
index 0000000..e8b91e7
--- /dev/null
+++ b/libs/binder/trusty/RpcServerTrusty.cpp
@@ -0,0 +1,142 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "RpcServerTrusty"
+
+#include <binder/Parcel.h>
+#include <binder/RpcServer.h>
+#include <binder/RpcServerTrusty.h>
+#include <binder/RpcThreads.h>
+#include <binder/RpcTransportTipcTrusty.h>
+#include <log/log.h>
+
+#include "../FdTrigger.h"
+#include "../RpcState.h"
+#include "TrustyStatus.h"
+
+using android::base::unexpected;
+
+namespace android {
+
+android::base::expected<sp<RpcServerTrusty>, int> RpcServerTrusty::make(
+ tipc_hset* handleSet, std::string&& portName, std::shared_ptr<const PortAcl>&& portAcl,
+ size_t msgMaxSize, std::unique_ptr<RpcTransportCtxFactory> rpcTransportCtxFactory) {
+ // Default is without TLS.
+ if (rpcTransportCtxFactory == nullptr)
+ rpcTransportCtxFactory = RpcTransportCtxFactoryTipcTrusty::make();
+ auto ctx = rpcTransportCtxFactory->newServerCtx();
+ if (ctx == nullptr) {
+ return unexpected(ERR_NO_MEMORY);
+ }
+
+ auto srv = sp<RpcServerTrusty>::make(std::move(ctx), std::move(portName), std::move(portAcl),
+ msgMaxSize);
+ if (srv == nullptr) {
+ return unexpected(ERR_NO_MEMORY);
+ }
+
+ int rc = tipc_add_service(handleSet, &srv->mTipcPort, 1, 0, &kTipcOps);
+ if (rc != NO_ERROR) {
+ return unexpected(rc);
+ }
+ return srv;
+}
+
+RpcServerTrusty::RpcServerTrusty(std::unique_ptr<RpcTransportCtx> ctx, std::string&& portName,
+ std::shared_ptr<const PortAcl>&& portAcl, size_t msgMaxSize)
+ : mRpcServer(sp<RpcServer>::make(std::move(ctx))),
+ mPortName(std::move(portName)),
+ mPortAcl(std::move(portAcl)) {
+ mTipcPort.name = mPortName.c_str();
+ mTipcPort.msg_max_size = msgMaxSize;
+ mTipcPort.msg_queue_len = 6; // Three each way
+ mTipcPort.priv = this;
+
+ if (mPortAcl) {
+ // Initialize the array of pointers to uuids.
+ // The pointers in mUuidPtrs should stay valid across moves of
+ // RpcServerTrusty (the addresses of a std::vector's elements
+ // shouldn't change when the vector is moved), but would be invalidated
+ // by a copy which is why we disable the copy constructor and assignment
+ // operator for RpcServerTrusty.
+ auto numUuids = mPortAcl->uuids.size();
+ mUuidPtrs.resize(numUuids);
+ for (size_t i = 0; i < numUuids; i++) {
+ mUuidPtrs[i] = &mPortAcl->uuids[i];
+ }
+
+ // Copy the contents of portAcl into the tipc_port_acl structure that we
+ // pass to tipc_add_service
+ mTipcPortAcl.flags = mPortAcl->flags;
+ mTipcPortAcl.uuid_num = numUuids;
+ mTipcPortAcl.uuids = mUuidPtrs.data();
+ mTipcPortAcl.extra_data = mPortAcl->extraData;
+
+ mTipcPort.acl = &mTipcPortAcl;
+ } else {
+ mTipcPort.acl = nullptr;
+ }
+}
+
+int RpcServerTrusty::handleConnect(const tipc_port* port, handle_t chan, const uuid* peer,
+ void** ctx_p) {
+ auto* server = reinterpret_cast<RpcServerTrusty*>(const_cast<void*>(port->priv));
+ server->mRpcServer->mShutdownTrigger = FdTrigger::make();
+ server->mRpcServer->mConnectingThreads[rpc_this_thread::get_id()] = RpcMaybeThread();
+
+ int rc = NO_ERROR;
+ auto joinFn = [&](sp<RpcSession>&& session, RpcSession::PreJoinSetupResult&& result) {
+ if (result.status != OK) {
+ rc = statusToTrusty(result.status);
+ return;
+ }
+
+ /* Save the session for easy access */
+ *ctx_p = session.get();
+ };
+
+ base::unique_fd clientFd(chan);
+ std::array<uint8_t, RpcServer::kRpcAddressSize> addr;
+ constexpr size_t addrLen = sizeof(*peer);
+ memcpy(addr.data(), peer, addrLen);
+ RpcServer::establishConnection(sp(server->mRpcServer), std::move(clientFd), addr, addrLen,
+ joinFn);
+
+ return rc;
+}
+
+int RpcServerTrusty::handleMessage(const tipc_port* port, handle_t chan, void* ctx) {
+ auto* session = reinterpret_cast<RpcSession*>(ctx);
+ status_t status = session->state()->drainCommands(session->mConnections.mIncoming[0], session,
+ RpcState::CommandType::ANY);
+ if (status != OK) {
+ LOG_RPC_DETAIL("Binder connection thread closing w/ status %s",
+ statusToString(status).c_str());
+ }
+
+ return NO_ERROR;
+}
+
+void RpcServerTrusty::handleDisconnect(const tipc_port* port, handle_t chan, void* ctx) {}
+
+void RpcServerTrusty::handleChannelCleanup(void* ctx) {
+ auto* session = reinterpret_cast<RpcSession*>(ctx);
+ auto& connection = session->mConnections.mIncoming.at(0);
+ LOG_ALWAYS_FATAL_IF(!session->removeIncomingConnection(connection),
+ "bad state: connection object guaranteed to be in list");
+}
+
+} // namespace android