# Irssi

Related articles

- IRC channels
- IRC Channel

irssi is a modular, ncurses based IRC (Internet Relay Chat) client for UNIX systems. It also supports SILC and ICB protocols via plugins.

## Installation

Install irssi, available in the official repositories.

You may also want to install irssi-systemd.

## Configuration

Personal configuration file should be located at `~/.irssi/config`; there is a template available in `/etc/irssi.conf`. You can start irssi with an alternate config file using the `--config` flag.

- You can use `/save` to save your current configuration to the config file.

- You can save the location of your currently opened windows by entering `/layout save`

- It sometimes might happen that umlauts are not correctly displayed. To fix this problem you have to set the right encoding with the following commands directly in irssi.

    /set recode_autodetect_utf8 ON
    /set recode_fallback CP1252
    /save

### Auto-logging

    /SET autolog ON
    /save

### Auto-connect to #archlinux on startup

Start irssi and then type the following in it:

    /server add -auto -network fn irc.freenode.net

`fn` is a common abbreviation for the freenode network, but any preferred word can be substituted for it (e.g. `foo`).

Now to automatically identify your nick for a given password, type:

    /network add -nick user -autosendcmd "/msg nickserv IDENTIFY *******" fn

where `user` is the nick with which you registered to nickserv and `*******` is the password for that nick, replace `fn` with the word that you used in the first command (e.g foo) if that is the case.

Note: Password will be visible when you type it and also it can be seen in ~/.irssi/config, so you can omit this step if you want to.
Note: If your password contain "$" (dolar symbol), you have to prefix it with another "$". So it would be "$$"

    /channel add -auto #archlinux fn
    /channel add -auto #archlinux-offtopic fn

Note: Instead of using passwords with NickServ, you can authenticate yourself using certificates on SSL connections as described in #Client certificates

### Hide joins, parts, and quits

In order to ignore showing of joining, leaving and quiting of users for all channels type the following in irssi:

    /ignore * joins
    /ignore * parts
    /ignore * quits

## Basic usage

Note: This section assumes you already know the basics of IRC and have used other clients in the past. For a more detailed introduction check the official documentation.

To start irssi issue the following command in a terminal:

    $ irssi

Many people prefer to run irssi within a terminal multiplexer since some scripts like the nicklist.pl script are dependent on a secondary window. Additionally, it allows the user to easily disconnect and reconnect to a session. Therefore, it is recommended that you select a multiplexer (e.g. GNU Screen or tmux) and review how it functions.

### Commands

Connection
`/server` | `/s` | These change the server of the current network.
`/connect` | `/c` | These open a new connection to a server. This is what you want to use in order to connect to multiple servers simultaneously (Ctrl+X switches between multiple servers).
`/disconnect` | `/dc` | These close the current connection to a server.
Movement
`ALT+(1-0,q-p,etc)` | Changes the currently active window. Or use Ctrl+n for the next window or Ctrl+p for the previous window.
`/window 1` | `/w 1` | Takes you to the first window. Windows go from are numbered across the top of your keyboard (1-0) and then start on the next row down (q-p).
`/window close` | `/wc` | These close the current window.
`/window move 1` | `/w move 1` | These move the current window to the first window position.
`/layout save` | This will save the current window positions for the next time you start irssi.
Miscellaneous
`/set` | This shows a list of all your current settings.
`/help` | This provides a helpful description/explanation for whatever parameter provided.
`/alias` | Lets you create your own shortcuts.

## Script installation

Tip: Several scripts are available in the AUR under irssi-script.

As an example, this section will outline the installation of a spell checking script.

Install ispell, an interactive spell-checking program for Unix.

Create a directory to hold your irssi scripts and within that, a directory that contains scripts which will be automatically run when starting irssi:

    $ mkdir -p ~/.irssi/scripts/autorun

Download the irssi spell-checking script, `spell.pl` into the script directory:

    $ cd ~/.irssi/scripts
    $ wget http://scripts.irssi.org/scripts/spell.pl .

As root run the following command (this will download perl module to `/usr/share/perl5/site_perl/Lingua/Ispell.pm`):

    # perl -MCPAN -e 'install Lingua::Ispell'

As a root change the path in `ispell.pm` to:

    /usr/bin/ispell

If you do not want to use CPAN review [1].

Start irssi and load the spell-checking script:

    /script load spell.pl

    - - Irssi: Loaded script spell

Bind `Alt + s` to spell check your current line.

    /bind meta-s /_spellcheck

If you want to autorun the script when you start irssi, just link the script into the autorun folder:

    $ cd ~/.irssi/scripts/autorun/
    $ ln -s ../spell.pl .

## Freenode SSL and SASL installation

### SSL Connection

Freenode uses port 6697, 7000 and 7070 for SSL connections. To connect to Freenode IRC network via SSL you have to setup an new connection. Start `irssi` and paste:

     /server add -auto -ssl -ssl_verify -ssl_capath /etc/ssl/certs -network freenode irc.freenode.net 6697

Save your new settings with:

    /save

If everything works you will see the "Z" mode set. It should look like this: "Mode change (+Zi) for user your-nick"

#### Client certificates

Freenode and OFTC support authentication using SSL certificates, providing an alternative to plaintext passwords. See Freenode's Identifying with CERTFP and Creating an SSL Certificate for more extensive details.

To create an password-less certificate that is valid for 730 days (when requested to enter details like state or even Common Name (CN), you can fill anything you want):

    $ openssl req -newkey rsa:2048 -days 730 -x509 -keyout irssi.key -out irssi.crt -nodes
    $ cat irssi.crt irssi.key > ~/.irssi/irssi.pem
    $ chmod 600 ~/.irssi/irssi.pem
    $ rm irssi.crt irssi.key

Next, find out the corresponding fingerprint:

    $ openssl x509 -sha1 -fingerprint -noout -in ~/.irssi/irssi.pem | sed -e 's/^.*=//;s/://g;y/ABCDEF/abcdef/'

This will write the fingerprint to stdout. (The sed command is there to format the fingerprint correctly by removing unwanted text and characters.) Copy the fingerprint string as you will register it in irssi shortly.

In irssi, disconnect from the network and add the client certificate and keys:

    /disconnect Freenode
    /server add -ssl_cert ~/.irssi/irssi.pem irc.freenode.net

Now connect (not `/reconnect`) and register your fingerprint

    /connect Freenode
    /msg NickServ identify YOUR_PASSWORD
    /msg NickServ cert add YOUR_FINGERPRINT

At this point, you can remove your password from the configuration file (if you saved it in there) and save your config with:

    /save

### Authenticating with SASL

Install the SASL script irssi-script-sasl from AUR. Load the script with each start of irssi:

    $ mkdir -p ~/.irssi/scripts/autorun
    $ cd ~/.irssi/scripts/autorun
    $ ln -s /usr/share/irssi/scripts/cap_sasl.pl cap_sasl.pl

Then open irssi and run the SASL script and enter your SASL settings. Please use your main nick "your-primary-nick" and "your-password" which is registered with nickserv.:

    /RUN cap_sasl.pl
    /sasl set freenode your-primary-nick your-password DH-BLOWFISH
    /sasl save
    /save

Restart irssi and have a look for "Irssi: SASL authentication successful".

## HTTP Proxy

To use irssi behind a HTTP proxy, the following commands are required:

    /SET use_proxy ON
    /SET proxy_address <Proxy host address>
    /SET proxy_port <Proxy port>
    /SET -clear proxy_string
    /SET proxy_string_after conn %s %d
    /EVAL SET proxy_string CONNECT %s:%d HTTP/1.0\n\n

irssi should then alter its config file correspondingly; if the proxy is not required, just set use_proxy to OFF.

Should the proxy require a password, try:

    /SET proxy_password your_pass

Otherwise:

    /SET -clear proxy_password

Note: SSL behind a proxy will fail with these settings.

## irssi with nicklist in tmux

The irssi plugin 'nicklist' offers to add a pane listing the users on the channel currently viewed. It has two methods to do this:

- screen, which simply adds the list to the right of irssi, but brings the disadvantage that the entire window gets redrawn every time irssi prints a line.

- fifo, which like the name suggests writes the list into a fifo that can then be continuously read with e. g. cat ~/.irssi/nicklistfifo.

nicklist will use the more efficient fifo with:

    /NICKLIST FIFO

This fifo can be used in a tmux window split vertically with irssi in its left pane and the cat from above in a small one in its right. Since the pane is dependent on its creating tmux session's geometry, a subsequent session with a different one needs to recreate it (which also implies a switch in irssi windows to refill the fifo).

E. g., the following script first checks for a running irssi, presumed to have been run by a previous execution of itself. Unless found it creates a new tmux session, a window named after and running irssi and then the pane with cat. If however irssi was found it merely attaches to the session and recreates the cat pane.

    #!/bin/bash

    T3=$(pgrep -u $USER -x irssi)

    irssi_nickpane() {
        tmux setw main-pane-width $(( $(tput cols) - 21));
        tmux splitw -v "cat ~/.irssi/nicklistfifo";
        tmux selectl main-vertical;
        tmux selectw -t irssi;
        tmux selectp -t 0;
    }

    irssi_repair() {
        tmux selectw -t irssi
        (( $(tmux lsp | wc -l) > 1 )) && tmux killp -a -t 0
        irssi_nickpane
    }

    if [ -z "$T3" ]; then
        tmux new-session -d -s main;
        tmux new-window -t main -n irssi irssi;
        irssi_nickpane ;
    fi
        tmux attach-session -d -t main;
        irssi_repair ;
    exit 0

## Virtual hostname (vhost)

A vhost can be used to change your hostname when connected to an IRC-server, commonly viewed when joining/parting or doing a whois. This is most commonly done on a server which have a static IP address. Without a vhost it would commonly look like so when doing a 'whois':

    nick@123.456.78.90.isp.com

The result of a successfull vhost could be like so if you have the domain example.com available:

    nick@example.com

Keep in mind that not every IRC-server supports the use of vhost. This might be individually set between the servers and not the network, so if you're experiencing issues with one server try another on the same network.

### Required preconfigurations

irssi supports using a vhost as long as the required configurations has been set. This includes especially that your host supports Recursive DNS Lookup (rDNS) using Pointer record (PTR). Additionally you should add an appropriate line to your `/etc/hosts` file.

To see if this is working, test with the 'host' DNS lookup utility included in dnsutils like so (where ip is a normal IPv4 address):

    host ip

If this returns something in the lines of this then you know that your rDNS is working.

    ip.in-addr.arpa domain name pointer example.com

### Enabling the vhost

There are a couple of ways to connect to a server with a given hostname. One is using the 'server' command with a -host argument like so:

    /server -host example.com irc.freenode.org

Another way would be to set your hostname (vhost) with the 'set' command which will save your hostname to `~/.irssi/config`:

    /set hostname example.com
    /save
    /server irc.freenode.org

## See also

- Official website
- Setting up Irssi - post on helpful Linux tidbits
- Guide to efficiently using Irssi and screen by Matt Sparks
- Official List of Irssi scripts
- IRC notifications with dzen2 by Jason Ryan
- Irssi’s /channel, /network, /server and /connect – What it means by Aaron Toponce

Category:

- Internet Relay Chat