[^._.^]ﾉ彡 Welcome to katchat, a simple chat server built entirely in C++.
Multichat server using TCP sockets and pthreads to handle new connections. The main loop sets up the socket and continously listens for new connections. When a new client connection is made, a new thread is created to handle that individual client.
int main() {
//create sockets
int SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
//bind socket
bind(SocketFD,(struct sockaddr *)&sa, sizeof sa)
//listen for incoming connection
listen(SocketFD, 10)
//loop continously to listen for clients
for(;;) {
//accept client connection
int ConnectFD = accept(SocketFD, NULL, NULL);
//create new thread
pthread_t thread;
pthread_create(&thread, NULL, handle_client, (void*) ConnectFD);
}
}
The handle_client method continously reads commands from the individual client until the connection is closed. The client must first enter a unique username before proceeding. Then, the client has the option of viewing and joining various chat rooms to talk.
void* handle_client() {
//read commands until connection closes
while(1) {
//read message from client
retval = recv(ConnectFD, buff, sizeof(buff), 0);
//get username if not logged in
if(!loggedin) {}
//take normal commands
else {
//handle requests from outside chat room
if(!inchat) {}
//handle requests from inside chat room
else {}
}
}
}
Clients can communicate with each other in chat rooms. Each chat_room object saves a list of file descriptors for each client in the room. When one client sends something to the server, the server can broadcast that message to the rest of the clients in the room by sending it through the file descriptor list.
> $ make
g++ -pthread -Wall katchat.cpp -o katchat
> $ ./katchat 30666
Each client must give a unique username in order to log into katchat.
- telnet:
> $ telnet 127.0.0.1 30666
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
[^._.^]ﾉ彡 Welcome to katchat!
Please enter a username.
> katherine
Sorry, username taken.
> sam
Welcome sam.
All commands begin with a forward slash "/".
/rooms: show all active chat rooms/join chatty_kathy: join the chat room named chatty_kathy/leave: leave a chat room/help: get help/quit: close katchat
Use /join to join a chat room and just start talking!
Try typing "katchat" in a chat room!