aandom / ft_irc

IRC Project

Installation

1. Clone the repository:

   git clone https://github.com/aandom/ft_irc.git
   
   

2. Navigate to the project directory:

   cd ft_irc
   
   

3. Build the project:

   make

Usage

Start Server

./ircserv <port> <password>

Connect Client Locally from host machine

nc localhost <password>
PASS <pass>
NICK <nick>
USER <username> 0 <localhost> :<first_name last_name>

Connect Client using Irssi

To connect an Irssi client, either you have to download Irssi in your machine or you can work in docker container. For docker container you can use 42-Valgrind container(the docker rule in the makefile will create to you multiple container so that you can use one for the server and others for multiple clients). When you run your server follow the below steps to connect clients.

irssi
/set nick <name>
/set user_name <user name>
/set server_reconnect_time -1
/set real_name <real_name>
/connect localhost <port> <password>

Alternativly you can create an irssi container using the below steps

docker run -it --rm --name irssi --network host irssi
/set nick <name>
/set user_name <user name>
/set real_name <real_name>
/connect host.docker.internal <port> <password>

Commands in Irssi

/oper 127.0.0.1 pa$$word  # Shows @ operator name
/kill <nick> reason
/join <channel>{,<channel>} [<key>{,<key>}]
/msg <nick or channel> <message>
/notice <nick or channel> <message>
/kick channel, channel user, user reason
/part <channel>{,<channel>} [<reason>]
/topic <channel> : [<topic>]
/invite <nickname> <channel>
/mode<target>[<mode string> [<mode arguments>...]]
/disconnect
/quit

Commands Locally

PRIVMSG <nick to be sent to> : message
NOTICE <nick to be sent to> : message
JOIN <channel>{,<channel>} [<key>{,<key>}]
KICK channel, channel user, user reason
PART <channel>{,<channel>} [<reason>]
TOPIC <channel> : [<topic>]
INVITE <nickname> <channel>
MODE <target>[<mode string> [<mode arguments>...]]
OPER 127.0.0.1 pa$$word
kill <nick> reason
QUIT
DISCONNECT

External Functions

getaddrinfo

Purpose: Resolves a hostname and service into address structures.

getaddrinfo(NULL, intToStr(this->port).c_str(), &hints, &this->address Parameters:

• node: The hostname or IP address.
• service: The service name or port number.
• hints: A pointer to an addrinfo structure with hints.
• res: A pointer to the result.

Return: Returns 0 on success, non-zero on error.

socket

Purpose: Creates a new socket.

this->socket_fd = socket(this->address->ai_family, this->address->ai_socktype, this->address->ai_protocol)

Parameters:

• domain: The protocol family (e.g., AF_INET for IPv4, AF_INET6 for IPv6).
• type: The socket type (e.g., SOCK_STREAM for TCP, SOCK_DGRAM for UDP).
• protocol: Specific protocol to be used (typically 0 for default).

Return: Returns a socket descriptor, or -1 on error.

setsockopt

Purpose: Sets options for a socket.

Parameters:

• socket: The socket descriptor.
• level: The protocol level at which the option resides.
• option_name: The specific option to set.
• option_value: Pointer to the option value.
• option_len: Size of the option value.

Return: Returns 0 on success, -1 on error.

bind

Purpose: Associates a socket with a specific local address and port.

Parameters:

• socket: The socket descriptor.
• address: The local address to bind to.
• address_len: The size of the local address structure.

Return: Returns 0 on success, -1 on error.

fcntl

Purpose: Performs various operations on a file descriptor.

Parameters:

• fd: The file descriptor.
• cmd: The operation to perform.
• arg: Additional argument depending on the operation.

Return: Returns the result of the operation, or -1 on error.

poll

Purpose: Waits for events on a set of file descriptors.

Parameters:

• fds: An array of structures of type struct pollfd.
• nfds: The number of file descriptors in the fds array.
• timeout: The maximum time (in milliseconds) that poll should wait for an event to occur.

Return: Returns the number of file descriptors that have events or errors, or one of the following values:

• -1: An error occurred, and errno is set to indicate the error.
• 0: The timeout specified by the timeout parameter expired, and no file descriptors had events.

send, recv

Purpose: Send and receive data on a connected socket.

Parameters:

• socket: The socket descriptor.
• buf: Pointer to the data buffer.
• len: The length of the data buffer.
• flags: Additional flags.

Return: Returns the number of bytes sent/received, or -1 on error.

close

Purpose: Closes a file descriptor (including sockets).

Parameters:

• fd: The file descriptor to close.

Return: Returns 0 on success, -1 on error.

References

1. https://modern.ircdocs.horse/
2. https://www.rfc-editor.org