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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/log.h>
#include <arpa/inet.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(MessageProcessor* messageProcessor)
: mListenFd(-1), mMessageProcessor(messageProcessor) {}
SocketComm::~SocketComm() {
}
void SocketComm::start() {
if (!listen()) {
return;
}
mListenThread = std::make_unique<std::thread>(std::bind(&SocketComm::listenThread, this));
}
void SocketComm::stop() {
if (mListenFd > 0) {
::close(mListenFd);
if (mListenThread->joinable()) {
mListenThread->join();
}
mListenFd = -1;
}
}
void SocketComm::sendMessage(vhal_proto::EmulatorMessage const& msg) {
std::lock_guard<std::mutex> lock(mMutex);
for (std::unique_ptr<SocketConn> const& conn : mOpenConnections) {
conn->sendMessage(msg);
}
}
bool SocketComm::listen() {
int retVal;
struct sockaddr_in servAddr;
mListenFd = socket(AF_INET, SOCK_STREAM, 0);
if (mListenFd < 0) {
ALOGE("%s: socket() failed, mSockFd=%d, errno=%d", __FUNCTION__, mListenFd, errno);
mListenFd = -1;
return false;
}
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(mListenFd, reinterpret_cast<struct sockaddr*>(&servAddr), sizeof(servAddr));
if(retVal < 0) {
ALOGE("%s: Error on binding: retVal=%d, errno=%d", __FUNCTION__, retVal, errno);
close(mListenFd);
mListenFd = -1;
return false;
}
ALOGI("%s: Listening for connections on port %d", __FUNCTION__, DEBUG_SOCKET);
if (::listen(mListenFd, 1) == -1) {
ALOGE("%s: Error on listening: errno: %d: %s", __FUNCTION__, errno, strerror(errno));
return false;
}
return true;
}
SocketConn* SocketComm::accept() {
sockaddr_in cliAddr;
socklen_t cliLen = sizeof(cliAddr);
int sfd = ::accept(mListenFd, reinterpret_cast<struct sockaddr*>(&cliAddr), &cliLen);
if (sfd > 0) {
char addr[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &cliAddr.sin_addr, addr, INET_ADDRSTRLEN);
ALOGD("%s: Incoming connection received from %s:%d", __FUNCTION__, addr, cliAddr.sin_port);
return new SocketConn(mMessageProcessor, sfd);
}
return nullptr;
}
void SocketComm::listenThread() {
while (true) {
SocketConn* conn = accept();
if (conn == nullptr) {
return;
}
conn->start();
{
std::lock_guard<std::mutex> lock(mMutex);
mOpenConnections.push_back(std::unique_ptr<SocketConn>(conn));
}
}
}
/**
* Called occasionally to clean up connections that have been closed.
*/
void SocketComm::removeClosedConnections() {
std::lock_guard<std::mutex> lock(mMutex);
std::remove_if(mOpenConnections.begin(), mOpenConnections.end(),
[](std::unique_ptr<SocketConn> const& c) { return !c->isOpen(); });
}
SocketConn::SocketConn(MessageProcessor* messageProcessor, int sfd)
: CommConn(messageProcessor), mSockFd(sfd) {}
/**
* Reads, in a loop, exactly numBytes from the given fd. If the connection is closed, returns
* an empty buffer, otherwise will return exactly the given number of bytes.
*/
std::vector<uint8_t> readExactly(int fd, int numBytes) {
std::vector<uint8_t> buffer(numBytes);
int totalRead = 0;
int offset = 0;
while (totalRead < numBytes) {
int numRead = ::read(fd, &buffer.data()[offset], numBytes - offset);
if (numRead == 0) {
buffer.resize(0);
return buffer;
}
totalRead += numRead;
}
return buffer;
}
/**
* Reads an int, guaranteed to be non-zero, from the given fd. If the connection is closed, returns
* -1.
*/
int32_t readInt(int fd) {
std::vector<uint8_t> buffer = readExactly(fd, sizeof(int32_t));
if (buffer.size() == 0) {
return -1;
}
int32_t value = *reinterpret_cast<int32_t*>(buffer.data());
return ntohl(value);
}
std::vector<uint8_t> SocketConn::read() {
int32_t msgSize = readInt(mSockFd);
if (msgSize <= 0) {
ALOGD("%s: Connection terminated on socket %d", __FUNCTION__, mSockFd);
return std::vector<uint8_t>();
}
return readExactly(mSockFd, msgSize);
}
void SocketConn::stop() {
if (mSockFd > 0) {
close(mSockFd);
mSockFd = -1;
}
}
int SocketConn::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);
if (mSockFd > 0) {
retVal = ::write(mSockFd, msgLenBytes, MSG_HEADER_LEN);
if (retVal == MSG_HEADER_LEN) {
retVal = ::write(mSockFd, data.data(), data.size());
}
}
return retVal;
}
} // impl
} // namespace V2_0
} // namespace vehicle
} // namespace automotive
} // namespace hardware
} // namespace android
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