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@ -0,0 +1,101 @@
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*This project has been created as part of the 42 curriculum by lfirmin, jle-neze.*
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## Description
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ft_irc is an IRC server written in C++ 98. It allows multiple clients to connect simultaneously, authenticate, join channels, and communicate in real time using the IRC protocol over TCP/IP. The server is built around a single `poll()` call with non-blocking I/O, handling all connections without forking.
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## Instructions
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### Compilation
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```
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make
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```
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### Execution
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```
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./ircserv <port> <password>
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```
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- `port` : the port the server listens on (e.g. 6667)
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- `password` : the connection password required by IRC clients
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### Connecting with irssi
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```
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irssi
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/connect localhost <port> <password>
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```
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### Connecting with netcat (for testing)
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```
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nc -C localhost <port>
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```
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Then send commands manually:
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```
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PASS <password>
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NICK <nickname>
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USER <username> 0 * :<realname>
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JOIN #<channel>
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PRIVMSG #<channel> :<message>
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```
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## Available Commands
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### Registration
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| Command | Usage | Description |
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|---------|-------|-------------|
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| `PASS` | `PASS <password>` | Authenticate with the server password |
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| `NICK` | `NICK <nickname>` | Set or change your nickname |
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| `USER` | `USER <username> 0 * :<realname>` | Set your username and realname |
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| `QUIT` | `QUIT` | Disconnect from the server |
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| `PING` | `PING <token>` | Ping the server, replies with PONG |
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### Channels
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| Command | Usage | Description |
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|---------|-------|-------------|
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| `JOIN` | `JOIN #<channel> [key]` | Join or create a channel |
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| `PART` | `PART #<channel>` | Leave a channel |
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| `PRIVMSG` | `PRIVMSG #<channel> :<message>` | Send a message to a channel |
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| `PRIVMSG` | `PRIVMSG <nick> :<message>` | Send a private message to a user |
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### Operator Commands
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| Command | Usage | Description |
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|---------|-------|-------------|
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| `KICK` | `KICK #<channel> <nick>` | Eject a user from the channel |
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| `INVITE` | `INVITE <nick> #<channel>` | Invite a user to the channel |
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| `TOPIC` | `TOPIC #<channel>` | View the channel topic |
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| `TOPIC` | `TOPIC #<channel> :<topic>` | Change the channel topic |
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| `MODE` | `MODE #<channel> +i` | Set channel invite-only |
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| `MODE` | `MODE #<channel> -i` | Remove invite-only |
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| `MODE` | `MODE #<channel> +t` | Restrict TOPIC to operators |
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| `MODE` | `MODE #<channel> -t` | Remove TOPIC restriction |
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| `MODE` | `MODE #<channel> +k <key>` | Set a channel password |
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| `MODE` | `MODE #<channel> -k` | Remove the channel password |
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| `MODE` | `MODE #<channel> +o <nick>` | Give operator privilege to a user |
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| `MODE` | `MODE #<channel> -o <nick>` | Remove operator privilege from a user |
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| `MODE` | `MODE #<channel> +l <limit>` | Set a user limit on the channel |
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| `MODE` | `MODE #<channel> -l` | Remove the user limit |
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## Resources
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- [RFC 1459 - IRC Protocol](https://datatracker.ietf.org/doc/html/rfc1459)
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- [RFC 2812 - IRC Client Protocol](https://datatracker.ietf.org/doc/html/rfc2812)
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- [Beej's Guide to Network Programming](https://beej.us/guide/bgnet/)
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- [irssi documentation](https://irssi.org/documentation/)
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### AI Usage
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Claude (claude.ai) was used during this project to:
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- Guide the step-by-step implementation of the Server class (socket setup, poll loop, client handling)
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- Explain IRC protocol concepts and numeric error codes
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- Help structure the Channel class and its methods
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- Debug compilation errors and logic issues
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All generated content was reviewed, understood and typed manually by the authors before being integrated into the project.
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@ -6,16 +6,19 @@
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# include <map>
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# include <sys/socket.h>
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# include <netinet/in.h>
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# include <netinet/tcp.h>
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# include <arpa/inet.h>
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# include <poll.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include "ParseBuffer.hpp"
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# include <iostream>
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# include <stdexcept>
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# include <cstring>
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# include <cerrno>
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# include "CommandValidator.hpp"
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# include "Channel.hpp"
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# include <cstdlib>
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struct ConnectedUser
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{
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316
srcs/Server.cpp
316
srcs/Server.cpp
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@ -36,6 +36,7 @@ void Server::start(void)
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pollfd.events = POLLIN;
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pollfd.revents = 0;
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_fds.push_back(pollfd);
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std::cout << "FT_IRC server startded on " << _port << " Port." << std::endl << "The password is \"" << _password << "\"." << std::endl;
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}
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ConnectedUser::ConnectedUser(void) : fd(-1), passOk(false), nickOk(false), userOk(false)
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@ -109,6 +110,8 @@ void Server::acceptNew(void)
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if (newFd == -1)
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throw std::runtime_error(strerror(errno));
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fcntl(newFd, F_SETFL, O_NONBLOCK);
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int flag = 1;
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setsockopt(newFd, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag));
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struct pollfd pfd;
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pfd.fd = newFd;
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pfd.events = POLLIN;
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@ -191,6 +194,20 @@ void Server::dispatch(int fd, const IrcMessage &msg)
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handlePing(fd, msg);
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else if (cmd == "QUIT")
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handleQuit(fd, msg);
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else if (cmd == "JOIN")
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handleJoin(fd, msg);
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else if (cmd == "PART")
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handlePart(fd, msg);
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else if (cmd == "PRIVMSG")
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handlePrivmsg(fd, msg);
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else if (cmd == "KICK")
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handleKick(fd, msg);
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else if (cmd == "INVITE")
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handleInvite(fd, msg);
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else if (cmd == "TOPIC")
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handleTopic(fd, msg);
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else if (cmd == "MODE")
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handleMode(fd, msg);
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}
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void Server::handlePass(int fd, const IrcMessage &msg)
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@ -243,4 +260,303 @@ void Server::handleQuit(int fd, const IrcMessage &msg)
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{
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removeUser(fd);
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(void)msg;
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}
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void Server::broadcastToChannel(const std::string &chanName, const std::string &msg, int exceptFd)
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{
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Channel &chan = _channels[chanName];
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const std::vector<int> &members = chan.getMembers();
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for (std::vector<int>::const_iterator it = members.begin(); it != members.end(); ++it)
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{
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if (*it != exceptFd)
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sendReply(*it, msg);
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}
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}
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void Server::handleJoin(int fd, const IrcMessage &msg)
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{
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std::string chanName = msg.param(0);
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if (!chanName.empty() && chanName[0] != '#')
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{
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sendReply(fd, "403 " + chanName + " :No such channel\r\n");
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return ;
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}
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if (_channels.find(chanName) == _channels.end())
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_channels.insert(std::make_pair(chanName, Channel(chanName)));
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Channel &chan = _channels[chanName];
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if (chan.isInviteOnly() && !chan.isInvited(fd))
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{
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sendReply(fd, "473 " + chanName + " :Cannot join channel (+i)\r\n");
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return ;
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}
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if (chan.getKey() != "" && (msg.paramCount() < 2 || msg.param(1) != chan.getKey()))
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{
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sendReply(fd, "475 " + chanName + " :Cannot join channel (+k)\r\n");
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return ;
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}
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if (chan.getUserLimit() > 0 && chan.memberCount() >= chan.getUserLimit())
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{
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sendReply(fd, "471 " + chanName + " :Cannot join channel (+l)\r\n");
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return ;
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}
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if (chan.hasMember(fd))
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return ;
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chan.addMember(fd);
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if (chan.memberCount() == 1)
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chan.addOperator(fd);
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std::string msg_add = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost JOIN " + chanName + "\r\n";
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broadcastToChannel(chanName, msg_add, -1);
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if (chan.getTopic() != "")
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sendReply(fd, "332 " + _users[fd].nick + " " + chanName + " :" + chan.getTopic() + "\r\n");
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}
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void Server::handlePart(int fd, const IrcMessage &msg)
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{
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std::string chanName = msg.param(0);
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if (_channels.find(chanName) == _channels.end())
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{
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sendReply(fd, "403 " + chanName + " :No such channel\r\n");
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return ;
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}
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Channel &chan = _channels[chanName];
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if (!chan.hasMember(fd))
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{
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sendReply(fd, "442 " + chanName + " :You're not on that channel\r\n");
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return ;
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}
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std::string msg_rm = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost PART " + chanName + "\r\n";
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broadcastToChannel(chanName, msg_rm, -1);
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chan.removeMember(fd);
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if (chan.memberCount() == 0)
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_channels.erase(chanName);
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}
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void Server::handlePrivmsg(int fd, const IrcMessage &msg)
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{
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std::string target = msg.param(0);
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std::string text = msg.param(1);
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std::string mess = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost PRIVMSG " + target + " :" + text + "\r\n";
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if (target[0] == '#')
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{
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if (_channels.find(target) == _channels.end())
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{
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sendReply(fd, "403 " + target + " :No such channel\r\n");
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return ;
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}
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Channel &chan = _channels[target];
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if (!chan.hasMember(fd))
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{
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sendReply(fd, "404 " + target + " :Cannot send to channel\r\n");
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return ;
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}
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broadcastToChannel(target, mess, fd);
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}
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else
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{
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for (std::map<int, ConnectedUser>::iterator it = _users.begin(); it != _users.end(); ++it)
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{
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if (it->second.nick == target)
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{
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sendReply(it->first, mess);
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return;
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}
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}
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sendReply(fd, "401 " + target + " :No such nick\r\n");
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}
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}
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void Server::handleKick(int fd, const IrcMessage &msg)
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{
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std::string chanName = msg.param(0);
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std::string targetNick = msg.param(1);
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if (_channels.find(chanName) == _channels.end())
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{
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sendReply(fd, "403 " + chanName + " :No such channel\r\n");
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return ;
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}
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Channel &chan = _channels[chanName];
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if (!chan.hasMember(fd))
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{
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sendReply(fd, "442 " + chanName + " :You're not on that channel\r\n");
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return ;
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}
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if (!chan.isOperator(fd))
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{
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sendReply(fd, "482 " + chanName + " :You're not channel operator\r\n");
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return ;
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}
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std::map<int, ConnectedUser>::iterator it = _users.begin();
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int targetFd = -1;
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for (; it != _users.end(); it++)
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{
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if (it->second.nick == targetNick)
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{
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targetFd = it->first;
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break ;
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}
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}
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if (targetFd == -1)
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{
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sendReply(fd, "401 " + targetNick + " :No such nick\r\n");
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return ;
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}
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if (!chan.hasMember(targetFd))
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{
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sendReply(fd, "441 " + targetNick + " " + chanName + " :They aren't on that channel\r\n");
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return ;
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}
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std::string kick_msg = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost KICK " + chanName + " " + targetNick + "\r\n";
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broadcastToChannel(chanName, kick_msg, -1);
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chan.removeMember(targetFd);
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}
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void Server::handleInvite(int fd, const IrcMessage &msg)
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{
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std::string targetNick = msg.param(0);
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std::string chanName = msg.param(1);
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if (_channels.find(chanName) == _channels.end())
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{
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sendReply(fd, "403 " + chanName + " :No such channel\r\n");
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return ;
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}
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Channel &chan = _channels[chanName];
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if (!chan.hasMember(fd))
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{
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sendReply(fd, "442 " + chanName + " :You're not on that channel\r\n");
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return ;
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}
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if (!chan.isOperator(fd))
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{
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sendReply(fd, "482 " + chanName + " :You're not channel operator\r\n");
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return ;
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}
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std::map<int, ConnectedUser>::iterator it = _users.begin();
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int targetFd = -1;
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for (; it != _users.end(); it++)
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{
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if (it->second.nick == targetNick)
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{
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targetFd = it->first;
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break ;
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}
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}
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if (targetFd == -1)
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{
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sendReply(fd, "401 " + targetNick + " :No such nick\r\n");
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return ;
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}
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chan.addInvited(targetFd);
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std::string invite_msg = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost INVITE " + targetNick + " " + chanName + "\r\n";
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sendReply(targetFd, invite_msg);
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}
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void Server::handleTopic(int fd, const IrcMessage &msg)
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{
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std::string chanName = msg.param(0);
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if (_channels.find(chanName) == _channels.end())
|
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{
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sendReply(fd, "403 " + chanName + " :No such channel\r\n");
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return ;
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}
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Channel &chan = _channels[chanName];
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if (!chan.hasMember(fd))
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{
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sendReply(fd, "442 " + chanName + " :You're not on that channel\r\n");
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return ;
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}
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if (msg.paramCount() == 1)
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{
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if (chan.getTopic() != "")
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sendReply(fd, "332 " + _users[fd].nick + " " + chanName + " :" + chan.getTopic() + "\r\n");
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else
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sendReply(fd, "331 " + _users[fd].nick + " " + chanName + " :No topic is set\r\n");
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return ;
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}
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if (chan.isTopicRestricted() && !chan.isOperator(fd))
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{
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sendReply(fd, "482 " + chanName + " :You're not channel operator\r\n");
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return ;
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}
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chan.setTopic(msg.param(1));
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std::string bd_msg = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost TOPIC " + chanName + " :" + chan.getTopic() + "\r\n";
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broadcastToChannel(chanName, bd_msg, -1);
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}
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void Server::handleMode(int fd, const IrcMessage &msg)
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{
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std::string chanName = msg.param(0);
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std::string modeStr = msg.param(1);
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if (chanName.empty() || chanName[0] != '#')
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return ;
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if (_channels.find(chanName) == _channels.end())
|
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{
|
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sendReply(fd, "403 " + chanName + " :No such channel\r\n");
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return ;
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}
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Channel &chan = _channels[chanName];
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if (!chan.hasMember(fd))
|
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{
|
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sendReply(fd, "442 " + chanName + " :You're not on that channel\r\n");
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return ;
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}
|
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if (!chan.isOperator(fd))
|
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{
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sendReply(fd, "482 " + chanName + " :You're not channel operator\r\n");
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return ;
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}
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bool adding = (modeStr[0] == '+');
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char mode = modeStr[1];
|
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if (mode == 'i')
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chan.setInviteOnly(adding);
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else if (mode == 't')
|
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chan.setTopicRestricted(adding);
|
||||
else if (mode == 'k')
|
||||
if (adding)
|
||||
if (msg.paramCount() >= 3)
|
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chan.setKey(msg.param(2));
|
||||
else
|
||||
return ;
|
||||
else
|
||||
chan.setKey("");
|
||||
else if (mode == 'o')
|
||||
{
|
||||
if (msg.paramCount() >= 3)
|
||||
{
|
||||
std::map<int, ConnectedUser>::iterator it = _users.begin();
|
||||
int targetFd = -1;
|
||||
for (; it != _users.end(); it++)
|
||||
{
|
||||
if (it->second.nick == msg.param(2))
|
||||
{
|
||||
targetFd = it->first;
|
||||
break ;
|
||||
}
|
||||
}
|
||||
if (targetFd == -1)
|
||||
{
|
||||
sendReply(fd, "401 " + msg.param(2) + " :No such nick\r\n");
|
||||
return ;
|
||||
}
|
||||
if (adding)
|
||||
chan.addOperator(targetFd);
|
||||
else
|
||||
chan.removeOperator(targetFd);
|
||||
}
|
||||
else
|
||||
return ;
|
||||
}
|
||||
else if (mode == 'l')
|
||||
{
|
||||
if (adding)
|
||||
{
|
||||
if (msg.paramCount() >= 3)
|
||||
chan.setUserLimit((size_t)atoi(msg.param(2).c_str()));
|
||||
else
|
||||
return ;
|
||||
}
|
||||
else
|
||||
chan.setUserLimit(0);
|
||||
}
|
||||
std::string mod_msg = ":" + _users[fd].nick + "!" + _users[fd].username + "@localhost MODE " + chanName + " " + modeStr + "\r\n";
|
||||
broadcastToChannel(chanName, mod_msg, -1);
|
||||
}
|
||||
Loading…
Reference in New Issue