Jack’s Tribal Tongue: Understanding and Responding to IRC Commands 🏴‍☠️ — Building an IRC Server, Pirate Style! ⚓💻 — Part 3

Jack isn’t just watching — he has absolute control over the tribes with licky licky charms 😉.

The tribe (clients) doesn’t just send random signals — they communicate using a structured language (IRC commands). Jack (the server) must listen carefully, understand their intent, and respond correctly. Again, if he does any mistake, he gets roasted.

Image source: https://pirates.fandom.com/wiki/Pelegostos_Tribe

How Jack handles Messages (PRIVMSG)

When one warrior wants to send a secret message (PRIVMSG command) to another single warrior (nick) or a pack (channel), Jack must ensure it reaches the right ears. Using RPL_PRIVMSG, Jack ensures: 📜 The sender’s name (nickname) is known. 🏹 The right target (destination) gets the message. 🗣️ The message content (text) is delivered properly.

📜 Warrior Loic speaks: “PRIVMSG Latha :Hunt at sunrise?” 🏕 Jack checks the words: Latha is the target, and the message is clear. ️️🗣️ Jack delivers the message correctly: :Loic PRIVMSG Latha :Hunt at sunrise?

If the words are wrong (invalid format), Jack snaps or scolds with the error codes

ERR_NOSUCHNICK (401): “That warrior does not exist.”

ERR_NOTEXTTOSEND (412): “Speak up or stay silent!”

Here, the trick is Jack mastering the language of the tribes from this extensive IRC specification. Below, we can see how the RPL responses and ERR codes play a role in handling these messages:

RPL responses

+----------------------+----------------------------------------------------------------------------------+-------------------------------------------------------------------+--------------------------------------------------------+----------------------------------------------+
|       Command        |                                 Response Format                                  |                            Parameters                             |              Conditions for Good Response              |             Conditions for Error             |
+----------------------+----------------------------------------------------------------------------------+-------------------------------------------------------------------+--------------------------------------------------------+----------------------------------------------+
| RPL_WELCOME (001)    | :server 001 nickname :Halo, Welcome to our little IRC server !nickname!user@host | nickname                                                          | Server sends a welcome message with nickname.          | Invalid nickname or server malfunction.      |
| RPL_YOURHOST (002)   | :server 002 nickname :Your host is server, running version 1.0                   | server, nickname                                                  | Correct server and nickname.                           | Server not running or incorrect server info. |
| RPL_CREATED (003)    | :server 003 nickname :This server was created date                               | nickname, creationTime                                            | Server created successfully with valid date.           | Incorrect creation time or server failure.   |
| RPL_MYINFO (004)     | :server 004 nickname servername version usermodes channelmodes                   | server, nickname                                                  | Server and nickname info match with version and modes. | Version mismatch or missing parameters.      |
| RPL_WHOISUSER (311)  | :server 311 nickname target username servername * :realname                      | nickname, target, username, server, realname                      | Correct information for user.                          | Incorrect data or target user not found.     |
| RPL_ENDOFWHOIS (318) | :server 318 nickname target :End of /WHOIS list                                  | nickname, target                                                  | WHOIS list completed correctly.                        | WHOIS query incomplete or user not found.    |
| RPL_WHOREPLY (352)   | :server 352 nickname mask username server nick flags hopcount :realname          | nickname, mask, username, server, nick, flags, hopcount, realname | Accurate WHO reply with user details.                  | Data mismatches or user not found.           |
| RPL_PONG             | :server PONG server :token                                                       | nickname, token                                                   | Correct server token sent in response.                 | Missing token or server failure.             |
| RPL_NICK (NICK)      | :server NICK nickname :newNickname                                               | nickname, newNickname                                             | User nickname updated correctly.                       | Invalid nickname or server conflict.         |
| RPL_UMODEIS (221)    | :server 221 nickname :uModeIs                                                    | nickname, uModeis                                                 | Correct user modes applied.                            | Invalid user mode or mode not set.           |
| RPL_TOPIC (332)      | :server 332 nickname channel :topic                                              | nickname, channel, topic                                          | Correct topic shown for the channel.                   | No topic set or incorrect channel.           |
| RPL_INVITING (341)   | :server 341 nickname invitee channel                                             | nickname, invitee, channel                                        | Invite sent correctly.                                 | Invalid channel or invitee not found.        |
+----------------------+----------------------------------------------------------------------------------+-------------------------------------------------------------------+--------------------------------------------------------+----------------------------------------------+

Error codes

+-----------------------------+------------------------------------------------------------------+---------------------------+--------------------------------------------+---------------------------------------------------------+
|           Command           |                           Error Format                           |        Parameters         |        Conditions for Good Response        |                  Conditions for Error                   |
+-----------------------------+------------------------------------------------------------------+---------------------------+--------------------------------------------+---------------------------------------------------------+
| ERR_NOSUCHNICK (401)        | :server 401 nickname wrongnick :No such nick                     | nickname, wrongnick       | No such nickname exists.                   | Invalid nickname or non-existent user.                  |
| ERR_NOSUCHCHANNEL (403)     | :server 403 nickname channel :No such channel                    | nickname, channel         | No such channel exists.                    | Channel not found or not accessible.                    |
| ERR_USERNOTINCHANNEL (441)  | :server 441 client nickname channel :They aren't on that channel | client, nickname, channel | User not present in channel.               | User should be on channel but isn't.                    |
| ERR_NEEDMOREPARAMS (461)    | :server 461 nickname command :Need more parameters               | nickname, command         | Command missing parameters.                | Insufficient parameters provided.                       |
| ERR_ALREADYREGISTERED (462) | :server 462 nickname :Already registered                         | nickname                  | User already registered.                   | User attempts to register again.                        |
| ERR_UNKNOWNCOMMAND (421)    | :server 421 nickname command :Unknown command                    | nickname, command         | Invalid or unrecognized command.           | Command doesn't exist or server error.                  |
| ERR_NOTREGISTERED (451)     | :server 451 nickname command :Register first                     | nickname, command         | User hasn't registered yet.                | User attempts to execute commands without registration. |
| ERR_PASSWDMISMATCH (464)    | :server 464 nickname :Password given was incorrect               | nickname                  | Password mismatch or failure during login. | Incorrect password provided for user.                   |
+-----------------------------+------------------------------------------------------------------+---------------------------+--------------------------------------------+---------------------------------------------------------+

As Jack masters the language of the tribes, his belief in his role as chief only strengthens. Each message delivered with precision reaffirms that he’s the true leader of the IRC tribe. 👑⚔️