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/*
* Copyright (C) 2020 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 "RpcServer"
#include <sys/socket.h>
#include <sys/un.h>
#include <thread>
#include <vector>
#include <binder/Parcel.h>
#include <binder/RpcServer.h>
#include <log/log.h>
#include "RpcState.h"
#include "RpcSocketAddress.h"
#include "RpcWireFormat.h"
namespace android {
using base::unique_fd;
RpcServer::RpcServer() {}
RpcServer::~RpcServer() {}
sp<RpcServer> RpcServer::make() {
return sp<RpcServer>::make();
}
void RpcServer::iUnderstandThisCodeIsExperimentalAndIWillNotUseItInProduction() {
mAgreedExperimental = true;
}
bool RpcServer::setupUnixDomainServer(const char* path) {
return setupSocketServer(UnixSocketAddress(path));
}
#ifdef __BIONIC__
bool RpcServer::setupVsockServer(unsigned int port) {
// realizing value w/ this type at compile time to avoid ubsan abort
constexpr unsigned int kAnyCid = VMADDR_CID_ANY;
return setupSocketServer(VsockSocketAddress(kAnyCid, port));
}
#endif // __BIONIC__
bool RpcServer::setupInetServer(unsigned int port, unsigned int* assignedPort) {
const char* kAddr = "127.0.0.1";
if (assignedPort != nullptr) *assignedPort = 0;
auto aiStart = InetSocketAddress::getAddrInfo(kAddr, port);
if (aiStart == nullptr) return false;
for (auto ai = aiStart.get(); ai != nullptr; ai = ai->ai_next) {
InetSocketAddress socketAddress(ai->ai_addr, ai->ai_addrlen, kAddr, port);
if (!setupSocketServer(socketAddress)) {
continue;
}
LOG_ALWAYS_FATAL_IF(socketAddress.addr()->sa_family != AF_INET, "expecting inet");
sockaddr_in addr{};
socklen_t len = sizeof(addr);
if (0 != getsockname(mServer.get(), reinterpret_cast<sockaddr*>(&addr), &len)) {
int savedErrno = errno;
ALOGE("Could not getsockname at %s: %s", socketAddress.toString().c_str(),
strerror(savedErrno));
return false;
}
LOG_ALWAYS_FATAL_IF(len != sizeof(addr), "Wrong socket type: len %zu vs len %zu",
static_cast<size_t>(len), sizeof(addr));
unsigned int realPort = ntohs(addr.sin_port);
LOG_ALWAYS_FATAL_IF(port != 0 && realPort != port,
"Requesting inet server on %s but it is set up on %u.",
socketAddress.toString().c_str(), realPort);
if (assignedPort != nullptr) {
*assignedPort = realPort;
}
return true;
}
ALOGE("None of the socket address resolved for %s:%u can be set up as inet server.", kAddr,
port);
return false;
}
void RpcServer::setMaxThreads(size_t threads) {
LOG_ALWAYS_FATAL_IF(threads <= 0, "RpcServer is useless without threads");
LOG_ALWAYS_FATAL_IF(mStarted, "must be called before started");
mMaxThreads = threads;
}
size_t RpcServer::getMaxThreads() {
return mMaxThreads;
}
void RpcServer::setRootObject(const sp<IBinder>& binder) {
std::lock_guard<std::mutex> _l(mLock);
mRootObject = binder;
}
sp<IBinder> RpcServer::getRootObject() {
std::lock_guard<std::mutex> _l(mLock);
return mRootObject;
}
void RpcServer::join() {
LOG_ALWAYS_FATAL_IF(!mAgreedExperimental, "no!");
std::vector<std::thread> pool;
{
std::lock_guard<std::mutex> _l(mLock);
LOG_ALWAYS_FATAL_IF(mServer.get() == -1, "RpcServer must be setup to join.");
// TODO(b/185167543): support more than one client at once
mConnection = RpcConnection::make();
mConnection->setForServer(sp<RpcServer>::fromExisting(this), 42 /*placeholder id*/);
mStarted = true;
for (size_t i = 0; i < mMaxThreads; i++) {
pool.push_back(std::thread([=] {
// TODO(b/185167543): do this dynamically, instead of from a static number
// of threads
unique_fd clientFd(TEMP_FAILURE_RETRY(
accept4(mServer.get(), nullptr, 0 /*length*/, SOCK_CLOEXEC)));
if (clientFd < 0) {
// If this log becomes confusing, should save more state from
// setupUnixDomainServer in order to output here.
ALOGE("Could not accept4 socket: %s", strerror(errno));
return;
}
LOG_RPC_DETAIL("accept4 on fd %d yields fd %d", mServer.get(), clientFd.get());
mConnection->join(std::move(clientFd));
}));
}
}
// TODO(b/185167543): don't waste extra thread for join, and combine threads
// between clients
for (auto& t : pool) t.join();
}
std::vector<sp<RpcConnection>> RpcServer::listConnections() {
std::lock_guard<std::mutex> _l(mLock);
if (mConnection == nullptr) return {};
return {mConnection};
}
bool RpcServer::setupSocketServer(const RpcSocketAddress& addr) {
{
std::lock_guard<std::mutex> _l(mLock);
LOG_ALWAYS_FATAL_IF(mServer.get() != -1, "Each RpcServer can only have one server.");
}
unique_fd serverFd(
TEMP_FAILURE_RETRY(socket(addr.addr()->sa_family, SOCK_STREAM | SOCK_CLOEXEC, 0)));
if (serverFd == -1) {
ALOGE("Could not create socket: %s", strerror(errno));
return false;
}
if (0 != TEMP_FAILURE_RETRY(bind(serverFd.get(), addr.addr(), addr.addrSize()))) {
int savedErrno = errno;
ALOGE("Could not bind socket at %s: %s", addr.toString().c_str(), strerror(savedErrno));
return false;
}
if (0 != TEMP_FAILURE_RETRY(listen(serverFd.get(), 1 /*backlog*/))) {
int savedErrno = errno;
ALOGE("Could not listen socket at %s: %s", addr.toString().c_str(), strerror(savedErrno));
return false;
}
mServer = std::move(serverFd);
return true;
}
} // namespace android
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