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/*
* Copyright (C) 2021 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 "RpcRawTransport"
#include <log/log.h>
#include <poll.h>
#include <stddef.h>
#include <binder/RpcTransportRaw.h>
#include "FdTrigger.h"
#include "OS.h"
#include "RpcState.h"
#include "RpcTransportUtils.h"
namespace android {
// RpcTransport with TLS disabled.
class RpcTransportRaw : public RpcTransport {
public:
explicit RpcTransportRaw(android::RpcTransportFd socket) : mSocket(std::move(socket)) {}
status_t pollRead(void) override {
uint8_t buf;
ssize_t ret = TEMP_FAILURE_RETRY(
::recv(mSocket.fd.get(), &buf, sizeof(buf), MSG_PEEK | MSG_DONTWAIT));
if (ret < 0) {
int savedErrno = errno;
if (savedErrno == EAGAIN || savedErrno == EWOULDBLOCK) {
return WOULD_BLOCK;
}
LOG_RPC_DETAIL("RpcTransport poll(): %s", strerror(savedErrno));
return -savedErrno;
} else if (ret == 0) {
return DEAD_OBJECT;
}
return OK;
}
status_t interruptableWriteFully(
FdTrigger* fdTrigger, iovec* iovs, int niovs,
const std::optional<android::base::function_ref<status_t()>>& altPoll,
const std::vector<std::variant<base::unique_fd, base::borrowed_fd>>* ancillaryFds)
override {
bool sentFds = false;
auto send = [&](iovec* iovs, int niovs) -> ssize_t {
ssize_t ret =
sendMessageOnSocket(mSocket, iovs, niovs, sentFds ? nullptr : ancillaryFds);
sentFds |= ret > 0;
return ret;
};
return interruptableReadOrWrite(mSocket, fdTrigger, iovs, niovs, send, "sendmsg", POLLOUT,
altPoll);
}
status_t interruptableReadFully(
FdTrigger* fdTrigger, iovec* iovs, int niovs,
const std::optional<android::base::function_ref<status_t()>>& altPoll,
std::vector<std::variant<base::unique_fd, base::borrowed_fd>>* ancillaryFds) override {
auto recv = [&](iovec* iovs, int niovs) -> ssize_t {
return receiveMessageFromSocket(mSocket, iovs, niovs, ancillaryFds);
};
return interruptableReadOrWrite(mSocket, fdTrigger, iovs, niovs, recv, "recvmsg", POLLIN,
altPoll);
}
virtual bool isWaiting() { return mSocket.isInPollingState(); }
private:
android::RpcTransportFd mSocket;
};
// RpcTransportCtx with TLS disabled.
class RpcTransportCtxRaw : public RpcTransportCtx {
public:
std::unique_ptr<RpcTransport> newTransport(android::RpcTransportFd socket, FdTrigger*) const {
return std::make_unique<RpcTransportRaw>(std::move(socket));
}
std::vector<uint8_t> getCertificate(RpcCertificateFormat) const override { return {}; }
};
std::unique_ptr<RpcTransportCtx> RpcTransportCtxFactoryRaw::newServerCtx() const {
return std::make_unique<RpcTransportCtxRaw>();
}
std::unique_ptr<RpcTransportCtx> RpcTransportCtxFactoryRaw::newClientCtx() const {
return std::make_unique<RpcTransportCtxRaw>();
}
const char *RpcTransportCtxFactoryRaw::toCString() const {
return "raw";
}
std::unique_ptr<RpcTransportCtxFactory> RpcTransportCtxFactoryRaw::make() {
return std::unique_ptr<RpcTransportCtxFactoryRaw>(new RpcTransportCtxFactoryRaw());
}
} // namespace android
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