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/* Copyright (C) 2022 The Qt Company Ltd.
*
* SPDX-License-Identifier: GPL-3.0-only WITH Qt-GPL-exception-1.0
*/
#include "tcpserver.h"
TcpServer::TcpServer(uint16_t serverPort)
{
int opt = TRUE;
// Initialize all m_clientSocket[] to 0 so not checked
for (uint8_t i = 0; i < MAX_CLIENTS; i++) {
m_clientSocket[i] = 0;
}
#ifdef _WIN32
// Initialize Winsock
WSADATA wsaData;
int iResult = 0;
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != NO_ERROR) {
wprintf(L"Error at WSAStartup()\n");
exit(EXIT_FAILURE);
}
#endif
// Create a master socket
if ((m_masterSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// Set master socket to allow multiple connections
if (setsockopt(m_masterSocket, SOL_SOCKET, SO_REUSEADDR, (char *)&opt,
sizeof(opt)) < 0) {
perror("setsockopt failed");
exit(EXIT_FAILURE);
}
timeval tv {2, 0}; //t.tv_sec = 2; t.tv_usec = 0;
int ret = setsockopt(m_masterSocket, SOL_SOCKET, SO_RCVTIMEO,
(char*)&tv, sizeof(timeval));
if (ret < 0) {
printf("Socket timeout error code: %d\n", ret);
perror("Socket timeout failed");
}
// Type of socket created
m_address.sin_family = AF_INET;
m_address.sin_addr.s_addr = INADDR_ANY;
m_address.sin_port = htons(serverPort);
// Bind the socket to localhost port 8888
if (bind(m_masterSocket, (struct sockaddr *)&m_address, sizeof(m_address)) < 0) {
doCloseSocket(m_masterSocket);
perror("bind failed");
exit(EXIT_FAILURE);
}
std::cout << "Listening to port " << serverPort << std::endl;
unsigned long mode = 1;
//ioctlsocket(m_masterSocket, FIONBIO, &mode);
// Try to specify maximum of 3 pending connections for the master socket
if (listen(m_masterSocket, 3) < 0) {
doCloseSocket(m_masterSocket);
perror("listen");
exit(EXIT_FAILURE);
}
m_addrlen = sizeof(m_address);
// Accept the incoming connection
std::cout << "Waiting for connections ...\n";
}
TcpServer::~TcpServer()
{
doCloseSocket(m_masterSocket);
for (uint8_t i = 0; i < MAX_CLIENTS; i++) {
doCloseSocket(m_clientSocket[i]);
}
}
std::string TcpServer::listenToClients(int &socket)
{
std::string data;
bool gotData = false;
//do {
// Clear the socket set
FD_ZERO(&m_readfds);
type_socket max_sd = m_masterSocket;
// Add master socket to set
FD_SET(m_masterSocket, &m_readfds);
// Add child sockets to set
for (int i = 0; i < MAX_CLIENTS; i++) {
// Socket descriptor
type_socket sd = m_clientSocket[i];
// If valid socket descriptor then add to read list
if (sd > 0)
FD_SET(sd, &m_readfds);
// Highest file descriptor number, need it for the select function
if (sd > max_sd)
max_sd = sd;
}
// timeout
timeval tv{2, 0}; //t.tv_sec = 2; t.tv_usec = 0;
// Wait for an activity on one of the sockets.
int activity = select((int)max_sd + 1, &m_readfds, NULL, NULL, &tv);
if ((activity < 0) && (errno != EINTR)) {
std::cout << "select error \n";
}
// If something happened on the master socket, then its an incoming connection
if (FD_ISSET(m_masterSocket, &m_readfds)) {
type_socket new_socket;
if ((new_socket = accept(m_masterSocket,
(struct sockaddr *)&m_address, (socklen_t *)&m_addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
// Add new socket to array of sockets
for (int i = 0; i < MAX_CLIENTS; i++) {
// If position is free
if (m_clientSocket[i] == 0) {
m_clientSocket[i] = new_socket;
std::cout << "New connection - adding to list of sockets with id " << i << std::endl;
break;
}
}
}
// Else its some IO operation on some other socket
for (int i = 0; i < MAX_CLIENTS; i++) {
type_socket sd = m_clientSocket[i];
if (FD_ISSET(sd, &m_readfds)) {
// Check if it was for closing , and also read the
// incoming message
#ifdef _WIN32
int valread = recv(sd, m_buffer, sizeof(m_buffer), 0);
#else
int valread = read(sd, m_buffer, sizeof(m_buffer));
#endif
if (valread == 0) {
// Somebody disconnected, get his details and print
getpeername(sd, (struct sockaddr *)&m_address,
(socklen_t *)&m_addrlen);
std::cout << "Client disconnected, socket id " << sd << std::endl;
// Close the socket and mark as 0 in list for reuse
doCloseSocket(sd);
m_clientSocket[i] = 0;
} else {
// Set the string terminating NULL byte
// on the end of the data read
gotData = true;
m_buffer[valread] = '\0';
socket = i;
data = m_buffer;
}
}
}
//} while (!gotData);
return data;
}
int TcpServer::sendResponse(int socketIndex, const std::string &message)
{
type_socket sd = m_clientSocket[socketIndex];
if (send(sd, message.c_str(), (int)message.length(), 0) != message.length()) {
printf("[TcpServer] Send failed\n");
return 1;
}
doCloseSocket(sd);
m_clientSocket[socketIndex] = 0;
return 0;
}
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