TCP_Protocol.cpp

#include <iostream>
#include <string>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <regex>

#include <TCP_Protocol.h>

using namespace inaf::oasbo::ConnectionProtocols;

TCPProtocol::TCPProtocol() {
	this->host = std::string("127.0.0.1:9003");
	std::string port { };
	split_ip_port(host, ip, port);
	this->port = std::stoi(port);
	this->srv_sock = -1;
	this->cli_sock = -1;
}
TCPProtocol::TCPProtocol(std::string ip, int prt) {
	this->host = std::string(ip).append(":").append(std::to_string(prt));
	this->ip = ip;
	this->port = prt;
	this->srv_sock = -1;
	this->cli_sock = -1;
}
TCPProtocol::~TCPProtocol() {
	closeConnectionToClient();
	closeConnectionToServer();
}

int TCPProtocol::sendToServer(PacketLib::BasePacket &pack) {
	int val = ::send(cli_sock, pack.getBinaryPointer(),
			pack.getHeaderSize() + pack.getPayloadSize() + pack.getTailSize(), MSG_CONFIRM);
	return val;
}
int TCPProtocol::receiveFromClient(PacketLib::BasePacket &pack) {
	size_t headerSize = pack.getHeaderSize();
	uint8_t *buff = new uint8_t[pack.getPacketStructureByteSize()];
	size_t rec = ::recv(this->srv_sock, &buff[0], headerSize,0);
	if(rec != headerSize){
		delete buff;
		return -1;
	}
	pack.copyToBinaryPointer(buff, headerSize);
	if(!pack.isRecognizedHeader()){
		resetPacket(pack, headerSize);
		delete buff;
		return -1;
	}

	int to_be_rcv = pack.getPayloadSize() + pack.getTailSize();
	rec += ::recv(this->srv_sock, &buff[headerSize],to_be_rcv,0);
	if(rec != to_be_rcv + headerSize){
		resetPacket(pack, headerSize);
		delete buff;
		return -1;
	}
	pack.copyToBinaryPointer(&buff[headerSize],
			pack.getPayloadSize() + pack.getTailSize(), headerSize);
	delete buff;
	return rec;
}

int TCPProtocol::connectToClient() {
	return m_connectToCli(ip, port);
}
int TCPProtocol::connectToServer() {
	return m_connectToSrv(ip, port);
}

int TCPProtocol::closeConnectionToClient() {
	if (srv_sock != -1) {
		::close(srv_sock);
		srv_sock = -1;
	}
	return 1;
}
int TCPProtocol::closeConnectionToServer() {
	if (cli_sock != -1) {
		::close(cli_sock);
		cli_sock = -1;
	}
	return 1;
}

bool TCPProtocol::isConnectedToClient() const {
	return srv_sock != -1;
}
bool TCPProtocol::isConnectedToServer() const {
	return cli_sock != -1;
}

int TCPProtocol::m_connectToCli(std::string ip, int port) {
	std::cout << "Listening on: " << ip << ":" << port << std::endl;
	// Creating socket file descriptor
	if ((srv_sock = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
		perror("socket failed");
		return -1;
	}
	struct sockaddr_in servaddr;
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = ::inet_addr(ip.c_str());
	servaddr.sin_port = htons(port);
	if (bind(srv_sock, (struct sockaddr*) &servaddr, sizeof(servaddr)) < 0) {
		perror("bind failed");
		return -1;
	}
	std::cout << "Waiting for connection" << std::endl;

	if (listen(srv_sock, 1) < 0) {
		perror("listen error");
		return -1;
	}
	int newSocket;
	int addrlen = sizeof(servaddr);
	if ((newSocket = accept(srv_sock, (struct sockaddr*) &servaddr,
			(socklen_t*) &addrlen)) < 0) {
		perror("accept error");
		return -1;
	}
	::close(srv_sock);
	std::cout << "Connected" << std::endl;
	srv_sock = newSocket;
	return srv_sock;
}
int TCPProtocol::m_connectToSrv(std::string ip, int port) {
	int sock = 0;
	struct sockaddr_in cli_addr;
	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		printf("\n Socket creation error \n");
		return -1;
	}

	cli_addr.sin_family = AF_INET;
	cli_addr.sin_port = htons(port);

	// Convert IPv4 and IPv6 addresses from text to binary form
	if (inet_pton(AF_INET, ip.c_str(), &cli_addr.sin_addr) <= 0) {
		printf("\nInvalid address/ Address not supported \n");
		return -1;
	}

	if (connect(sock, (struct sockaddr*) &cli_addr, sizeof(cli_addr)) < 0) {
		printf("\nConnection Failed \n");
		return -1;
	}
	std::cout << "Connected" << std::endl;
	this->cli_sock = sock;
	return cli_sock;

}

void TCPProtocol::split_ip_port(const std::string &ip_port,
		std::string &ip_address, std::string &port) {
	// Regex pattern to match IP address and port in the format "xxx.xxx.xxx.xxx:xxxx"
	std::regex pattern("^(\\d{1,3}\\.){3}\\d{1,3}:(\\d{1,5})$");

	// Check if the input string matches the expected format
	if (!std::regex_match(ip_port, pattern)) {
		std::cerr << "Error: invalid IP address and port format: " << ip_port
				<< std::endl;
		exit(EXIT_FAILURE);
	}

	// Split the input string into IP address and port
	int colon_pos = ip_port.find(":");
	ip_address = ip_port.substr(0, colon_pos);
	port = ip_port.substr(colon_pos + 1);
}

void TCPProtocol::resetPacket(PacketLib::BasePacket &pack, int bytes) {
	uint8_t *buff = new uint8_t[bytes];
	std::memset(buff, 0, bytes);
	int toBeReset = std::min(static_cast<int>(pack.getPacketStructureByteSize()), bytes);
	pack.copyToBinaryPointer(buff, toBeReset);
	delete buff;
}