Internet Relay Chat: Client-to-Client Protocol (CTCP)
draft-oakley-irc-ctcp-01

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Network Working Group                                       M. Mikulenas
Internet-Draft                                               Independent
Updates: 1459, 2812 (if approved)                              D. Oakley
Intended status: Informational                                   ircdocs
Expires: January 19, 2018                                  July 18, 2017

         Internet Relay Chat: Client-to-Client Protocol (CTCP)
                        draft-oakley-irc-ctcp-01

Abstract

   This document describes the Client-to-Client Protocol (CTCP), which
   lets Internet Relay Chat (IRC) clients send each other messages that
   get displayed or responded to in special ways.  CTCP has been widely
   implemented, with most clients supporting it natively.  This document
   outlines how to implement CTCP and the most common messages used.

   It updates RFC 1459 and RFC 2812.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on January 19, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   to this document.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Message Syntax  . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Message Types . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Extended formatting . . . . . . . . . . . . . . . . . . .   4
     3.2.  Metadata Query  . . . . . . . . . . . . . . . . . . . . .   4
     3.3.  Extended Query  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Messages  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Appendix A.  Message List . . . . . . . . . . . . . . . . . . . .   6
     A.1.  ACTION  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     A.2.  CLIENTINFO  . . . . . . . . . . . . . . . . . . . . . . .   7
     A.3.  DCC . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     A.4.  FINGER  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     A.5.  PING  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     A.6.  SOURCE  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     A.7.  TIME  . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     A.8.  VERSION . . . . . . . . . . . . . . . . . . . . . . . . .   9
     A.9.  USERINFO  . . . . . . . . . . . . . . . . . . . . . . . .  10
   Appendix B.  Change History [RFC Editor: Please remove this
                section] . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The core Internet Relay Chat (IRC) protocol as described in [RFC1459]
   and [RFC2812] only has a single command for regular user messages,
   and does not provide a way for clients to exchange information
   directly.  Client-to-Client Protocol (CTCP) messages let clients
   exchange messages that get displayed or responded to in special ways.
   Some examples of how CTCP is used is to request special formatting on
   messages, query other clients for metadata, and help initiate file
   transfers with other clients.

   This document goes over the subset of CTCP which is commonly
   implemented, and is compatible with clients implementing CTCP as
   described by older documents.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

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