Operators guide for the charybdis IRC server
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Chapter 2. Umodes

Table of Contents
2.1. Meanings of user modes
2.2. Snomask usage
2.3. Meanings of server notice masks

2.1. Meanings of user modes

2.1.1. +a, server administrator

This vanity usermode is used to denote a server administrator in WHOIS output. All local "admin" privileges are independent of it, though services packages may grant extra privileges to +a users.

2.1.2. +D, deaf

Note: This is a user umode, which anybody can set. It is not specific to operators.

Users with the +D umode set will not receive messages sent to channels. Joins, parts, topic changes, mode changes, etc are received as normal, as are private messages.

Support of this umode is indicated by the DEAF token in RPL_ISUPPORT (005); the parameter indicates the letter of the umode. Note that several common IRCD implementations have an umode like this (typically +d) but do not have the token in 005.

2.1.3. +g, Caller ID

Note: This is a user umode, which anybody can set. It is not specific to operators.

Users with the +g umode set will only receive private messages from users on a session-defined whitelist, defined by the /accept command. If a user who is not on the whitelist attempts to send a private message, the target user will receive a rate-limited notice saying that the user wishes to speak to them.

Network operators are not affected by the callerid whitelist system in the event that they need to speak to users who have it enabled.

Support of this umode is indicated by the CALLERID token in RPL_ISUPPORT (005); the optional parameter indicates the letter of the umode, otherwise +g.

2.1.4. +i, invisible

Note: This is a user umode, which anybody can set. It is not specific to operators.

Invisible users do not show up in WHO and NAMES unless you can see them.

2.1.5. +l, receive locops

LOCOPS is a version of OPERWALL that is sent to opers on a single server only. With cluster{} and shared{} blocks they can optionally be propagated further.

Unlike OPERWALL, any oper can send and receive LOCOPS.

2.1.6. +o, operator

This indicates global operator status.

2.1.7. +Q, disable forwarding

Note: This is a user umode, which anybody can set. It is not specific to operators.

This umode prevents you from being affected by channel forwarding. If enabled on a channel, channel forwarding sends you to another channel if you could not join. See channel mode +f for more information.

2.1.8. +R, reject messages from unauthenticated users

Note: This is a user umode, which anybody can set. It is not specific to operators.

If a user has the +R umode set, then any users who are not authenticated will receive an error message if they attempt to send a private message or notice to the +R user.

Opers and accepted users (like in +g) are exempt. Unlike +g, the target user is not notified of failed messages.

2.1.9. +s, receive server notices

This umode allows an oper to receive server notices. The requested types of server notices are specified as a parameter ("snomask") to this umode.

2.1.10. +S, network service

Note: This umode can only be set by servers named in a service{} block.

This umode grants various features useful for services. For example, clients with this umode cannot be kicked or deopped on channels, can send to any channel, do not show channels in WHOIS, can be the target of services aliases and do not appear in /stats p. No server notices are sent for hostname changes by services clients; server notices about kills are sent to snomask +k instead of +s.

The exact effects of this umode are variable; no user or oper on an actual charybdis server can set it.

2.1.11. +w, receive wallops

Note: This is a user umode, which anybody can set. It is not specific to operators.

Users with the +w umode set will receive WALLOPS messages sent by opers. Opers with +w additionally receive WALLOPS sent by servers (e.g. remote CONNECT, remote SQUIT, various severe misconfigurations, many services packages).

2.1.12. +z, receive operwall

OPERWALL differs from WALLOPS in that the ability to receive such messages is restricted. Opers with +z set will receive OPERWALL messages.

2.1.13. +Z, SSL user

This umode is set on clients connected via SSL/TLS. It cannot be set or unset after initial connection.

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Introduction Snomask usage