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/*
* Copyright (C) 2017 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 "SocketComm"
#include <android/hardware/automotive/vehicle/2.0/IVehicle.h>
#include <android/log.h>
#include <log/log.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include "SocketComm.h"
// Socket to use when communicating with Host PC
static constexpr int DEBUG_SOCKET = 33452;
namespace android {
namespace hardware {
namespace automotive {
namespace vehicle {
namespace V2_0 {
namespace impl {
SocketComm::SocketComm() {
// Initialize member vars
mCurSockFd = -1;
mExit = 0;
mSockFd = -1;
}
SocketComm::~SocketComm() {
stop();
}
int SocketComm::connect() {
sockaddr_in cliAddr;
socklen_t cliLen = sizeof(cliAddr);
int cSockFd = accept(mSockFd, reinterpret_cast<struct sockaddr*>(&cliAddr), &cliLen);
if (cSockFd >= 0) {
{
std::lock_guard<std::mutex> lock(mMutex);
mCurSockFd = cSockFd;
}
ALOGD("%s: Incoming connection received on socket %d", __FUNCTION__, cSockFd);
} else {
cSockFd = -1;
}
return cSockFd;
}
int SocketComm::open() {
int retVal;
struct sockaddr_in servAddr;
mSockFd = socket(AF_INET, SOCK_STREAM, 0);
if (mSockFd < 0) {
ALOGE("%s: socket() failed, mSockFd=%d, errno=%d", __FUNCTION__, mSockFd, errno);
mSockFd = -1;
return -errno;
}
memset(&servAddr, 0, sizeof(servAddr));
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = INADDR_ANY;
servAddr.sin_port = htons(DEBUG_SOCKET);
retVal = bind(mSockFd, reinterpret_cast<struct sockaddr*>(&servAddr), sizeof(servAddr));
if(retVal < 0) {
ALOGE("%s: Error on binding: retVal=%d, errno=%d", __FUNCTION__, retVal, errno);
close(mSockFd);
mSockFd = -1;
return -errno;
}
listen(mSockFd, 1);
// Set the socket to be non-blocking so we can poll it continouously
fcntl(mSockFd, F_SETFL, O_NONBLOCK);
return 0;
}
std::vector<uint8_t> SocketComm::read() {
int32_t msgSize;
int numBytes = 0;
// This is a variable length message.
// Read the number of bytes to rx over the socket
numBytes = ::read(mCurSockFd, &msgSize, sizeof(msgSize));
msgSize = ntohl(msgSize);
if (numBytes != sizeof(msgSize)) {
// This happens when connection is closed
ALOGD("%s: numBytes=%d, expected=4", __FUNCTION__, numBytes);
ALOGD("%s: Connection terminated on socket %d", __FUNCTION__, mCurSockFd);
{
std::lock_guard<std::mutex> lock(mMutex);
mCurSockFd = -1;
}
return std::vector<uint8_t>();
}
std::vector<uint8_t> msg = std::vector<uint8_t>(msgSize);
numBytes = ::read(mCurSockFd, msg.data(), msgSize);
if ((numBytes == msgSize) && (msgSize > 0)) {
// Received a message.
return msg;
} else {
// This happens when connection is closed
ALOGD("%s: numBytes=%d, msgSize=%d", __FUNCTION__, numBytes, msgSize);
ALOGD("%s: Connection terminated on socket %d", __FUNCTION__, mCurSockFd);
{
std::lock_guard<std::mutex> lock(mMutex);
mCurSockFd = -1;
}
return std::vector<uint8_t>();
}
}
void SocketComm::stop() {
if (mExit == 0) {
std::lock_guard<std::mutex> lock(mMutex);
mExit = 1;
// Close emulator socket if it is open
if (mCurSockFd != -1) {
close(mCurSockFd);
mCurSockFd = -1;
}
if (mSockFd != -1) {
close(mSockFd);
mSockFd = -1;
}
}
}
int SocketComm::write(const std::vector<uint8_t>& data) {
static constexpr int MSG_HEADER_LEN = 4;
int retVal = 0;
union {
uint32_t msgLen;
uint8_t msgLenBytes[MSG_HEADER_LEN];
};
// Prepare header for the message
msgLen = static_cast<uint32_t>(data.size());
msgLen = htonl(msgLen);
std::lock_guard<std::mutex> lock(mMutex);
if (mCurSockFd != -1) {
retVal = ::write(mCurSockFd, msgLenBytes, MSG_HEADER_LEN);
if (retVal == MSG_HEADER_LEN) {
retVal = ::write(mCurSockFd, data.data(), data.size());
}
}
return retVal;
}
} // impl
} // namespace V2_0
} // namespace vehicle
} // namespace automotive
} // namespace hardware
} // namespace android
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