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ServerClass.cpp
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ServerClass.cpp
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#include "ServerClass.hpp"
#include "ClientClass.hpp"
#include "Topic.hpp"
#include "lib.hpp"
Server::Server(uint16_t port)
{
// Clean buffer
memset(buf, 0, BUFLEN);
// Open UDP incoming messages socket
udp_listen.fd = socket(AF_INET, SOCK_DGRAM, 0);
udp_listen.events = POLLIN;
udp_listen.revents = 0;
// Open TCP incoming connections socket
tcp_listen.fd = socket(AF_INET, SOCK_STREAM, 0);
tcp_listen.events = POLLIN;
tcp_listen.revents = 0;
// Declare STDIN pollfd
keyboard_in.fd = STDIN_FILENO;
keyboard_in.events = POLLIN;
keyboard_in.revents = 0;
// Configure the socket address structure
// Use IPV4 address
addr.sin_family = AF_INET;
// Populate with given port
addr.sin_port = htons(port);
// Listen from any incoming address
addr.sin_addr.s_addr = INADDR_ANY;
// Bind socket address struct to sockets used for listening
err = bind(udp_listen.fd, (struct sockaddr *)&addr, sizeof(addr));
DIE(err < 0, "UDP BIND FAILED");
err = bind(tcp_listen.fd, (struct sockaddr *)&addr, sizeof(addr));
DIE(err < 0, "TCP BIND FAILED");
err = listen(tcp_listen.fd, MAXQ);
DIE(err < 0, "LISTEN ERROR");
fds.push_back(keyboard_in);
fds.push_back(udp_listen);
fds.push_back(tcp_listen);
timeout = 3 MINUTES;
status = true;
}
Server::~Server()
{
// Closing all sockets
for (int i = 0; i < (int)fds.size(); i++)
{
shutdown(fds[i].fd, SHUT_RDWR);
err = close(fds[i].fd);
DIE(err < 0, "CLOSE ERROR");
}
}
message Server::handlePolls(int num_resp)
{
message package;
memset(&package, 0, sizeof(package));
// printf("CHECKING FOR KEYBOARD INPUT\n");
// If exit command was received from keyboard
// Close all sockets and exit
if (fds[LISTEN_KEY].revents == POLLIN)
{
// Read keyboard input
memset(buf, 0, BUFLEN);
fgets(buf, BUFLEN - 1, stdin);
if (strncmp(buf, "exit", 4) == 0)
{
status = false;
package.type = INVALID;
return package;
}
fds[LISTEN_KEY].revents = 0;
}
// printf("ADDING ANY NEW CLIENTS THAT REQ TO CONN\n");
// Check if any clients requested to connect
if (fds[LISTEN_TCP].revents == POLLIN)
createClient();
fds[LISTEN_TCP].revents = 0;
// printf("PROCESSING ANY COMMANDS FROM EXISTING CLIENTS\n");
// Process any requests from existing clients
for (auto client : registered_clients)
{
getClientCommand(client.second);
client.second->descriptor->revents = 0;
}
// printf("CHECKING FOR UDP PACKAGES %d\n", fds[LISTEN_UDP].revents);
// Check if remaining responses are UDP packages
// Check for incoming UDP package
if (fds[LISTEN_UDP].revents == POLLIN)
{
// If execution reached this point, a UDP package was found
// Clear buffer before adding new data
memset(buf, 0, BUFLEN);
// SENDER INFORMATION
struct sockaddr_in sender_addr;
socklen_t sender_len;
sender_len = sizeof(sender_addr);
// printf("RECEIVING UDP PACKAGE\n");
// Reading from UDP socket
err = recvfrom(fds[LISTEN_UDP].fd, buf, BUFLEN, 0,
(struct sockaddr *)&sender_addr,
&sender_len);
DIE(err < 0, "ERROR RECV");
// Populate sender address
package.udp_ip = ntohl(sender_addr.sin_addr.s_addr);
package.udp_port = sender_addr.sin_port;
// Populate the package TOPIC field
memcpy(package.topic, buf, TOPIC_SIZE);
package.type = buf[TOPIC_SIZE];
// Populate the content field
memcpy(package.content, buf + TOPIC_SIZE + 1, CONTENT_SIZE);
// Invalid package, has no type or invalid type and/or no content
if (err < TOPIC_SIZE ||
package.type < 0 ||
package.type > 3)
{
package.type = INVALID;
fds[LISTEN_UDP].revents = 0;
return package;
}
}
fds[LISTEN_UDP].revents = 0;
return package;
}
void Server::createClient()
{
// CREATING A NEW CLIENT OR SIGN IN IF EXISTING
struct sockaddr_in new_client;
socklen_t client_len = sizeof(new_client);
int new_client_sock;
new_client_sock = accept(fds[LISTEN_TCP].fd,
(struct sockaddr *)&new_client,
&client_len);
DIE(new_client_sock < 0,
"Error receiving new client connection");
// Disabling Neagle algorithm for new client sock
int yes = 1;
err = setsockopt(new_client_sock,
IPPROTO_TCP,
TCP_NODELAY,
(char *)&yes,
sizeof(int));
DIE(err < 0, "SETSOCKOPT ERROR");
// The client must transmit it's ID immediately
// If the client does not transmit a valid ID it gets a message
// of type DENIED and the client will shutdown
char client_id[10];
memset(buf, 0, BUFLEN);
err = recv(new_client_sock, buf, 10, MSG_DONTWAIT);
DIE(err < 0, "RECV CLIENT ID ERROR");
strcpy(client_id, buf);
// Notify that a new client has joined
message confirmation;
if (registered_clients.count(client_id) == 0)
{
printf("New client %s connected from %s:%u.\n",
client_id,
inet_ntoa(new_client.sin_addr),
new_client.sin_port);
confirmation.type = ACCEPT;
err = send(new_client_sock, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
}
else if (!registered_clients[client_id]->online)
{
printf("New client %s connected from %s:%u.\n",
client_id,
inet_ntoa(new_client.sin_addr),
new_client.sin_port);
confirmation.type = ACCEPT;
err = send(new_client_sock, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
}
else
{
printf("Client %s already connected.\n", client_id);
confirmation.type = DENIED;
err = send(new_client_sock, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
return;
}
if (strlen(client_id) <= 0)
return;
pollfd new_client_poll;
new_client_poll.fd = new_client_sock;
new_client_poll.events = POLLIN;
new_client_poll.revents = 0;
fds.push_back(new_client_poll);
// Make sure the client ID isn't already registered
if (registered_clients.count(client_id) == 0)
{
// Create a new client object
Client *new_client_obj = new Client();
strcpy(new_client_obj->id, client_id);
// Store client object in map
registered_clients[client_id] = new_client_obj;
}
// Set client to appear as online
registered_clients[client_id]->online = true;
registered_clients[client_id]->descriptor = &fds.back();
registered_clients[client_id]->index = fds.size() - 1;
for (auto stored : registered_clients[client_id]->backlog)
{
err = send(new_client_sock, &stored->msg, sizeof(stored->msg), 0);
DIE(err < 0, "SENDING STORED MESSAGES FAILED");
// Decrement the number of remaining messages to be sent
// If no more clients need to receive this message, delete it from
// The server's memory
stored->reach--;
if (stored->reach == 0)
free(stored);
}
// Clear this client's backlog since all messages contained have been sent.
registered_clients[client_id]->backlog.clear();
// Refresh poll fd list
for (auto client : registered_clients)
{
client.second->descriptor = &fds[client.second->index];
}
}
int Server::getClientCommand(Client *cli)
{
if (cli->descriptor->revents == 0)
return 0;
message confirmation;
cli_command new_comm;
memset(&new_comm, 0, sizeof(new_comm));
memset(&confirmation, 0, sizeof(confirmation));
// If error is encountered, close the connection to the client
if (cli->descriptor->revents == 25)
new_comm.type = EXIT;
else
{
err = recv(cli->descriptor->fd, &new_comm, sizeof(new_comm), 0);
DIE(err < 0, "RECV ERR");
}
if (err == 0 || new_comm.type == EXIT)
{
printf("Client %s disconnected.\n", cli->id);
close(cli->descriptor->fd);
cli->online = false;
cli->descriptor->revents = 0;
fds.erase(fds.begin() + cli->index);
return 0;
}
// If the topic does not exist let the client know
// Else process the subscription request accordingly
if (topicLibrary.count(std::string(new_comm.topic)) == 0)
{
confirmation.type = CONFIRM;
strcpy(confirmation.topic, "No such topic.\n");
err = send(cli->descriptor->fd, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
return 0;
}
else if (new_comm.type == UNSUB)
{
topicLibrary[std::string(new_comm.topic)].subscribers.remove(cli);
confirmation.type = CONFIRM;
strcpy(confirmation.topic, "Unsubscribed from topic.\n");
err = send(cli->descriptor->fd, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
}
else if (new_comm.type == SUB_NOSF)
{
cli->isSF[std::string(new_comm.topic)] = 0;
topicLibrary[std::string(new_comm.topic)].subscribers.remove(cli);
topicLibrary[std::string(new_comm.topic)].subscribers.push_back(cli);
confirmation.type = CONFIRM;
strcpy(confirmation.topic, "Subscribed to topic.\n");
err = send(cli->descriptor->fd, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
}
else if (new_comm.type == SUB_SF)
{
cli->isSF[std::string(new_comm.topic)] = 1;
topicLibrary[std::string(new_comm.topic)].subscribers.remove(cli);
topicLibrary[std::string(new_comm.topic)].subscribers.push_back(cli);
confirmation.type = CONFIRM;
strcpy(confirmation.topic, "Subscribed to topic.\n");
err = send(cli->descriptor->fd, &confirmation, sizeof(confirmation), 0);
DIE(err < 0, "CONFIRM ERROR");
}
return 1;
}
char *Server::getBuf()
{
return buf;
}
pollfd *Server::getSockList()
{
return &fds[0];
}
std::vector<pollfd> Server::getSockVect()
{
return fds;
}
int Server::sockCount()
{
return fds.size();
}
int Server::getTimeout()
{
return timeout;
}
bool Server::isRunning()
{
return status;
}