# Two IRC Hacks

Posted on January 19, 2015

This is a short post revealing two little-known facts about two IRC-networks.

### Find a channel about a particular topic on an IRC network

So, let’s say you need to find a channel on a large IRC network.

Turns out that on freenode, you can use convenient bot called Alis.

Let’s say, you want to find a channel about My Little Pony on freenode:

/msg alis list *pon* -min 10
/msg alis list *mlp* -min 10

where -min 10 means “has at least 10 users right now” and the rest is self-explanatory.

For an arbitrary large network that doesn’t have awesome bots, we can use an expect-script to /LIST it and then grep the output. We will use telnet, so we’d like that network to operate in plain text mode.

Here’s my script:

#!/usr/bin/env expect

set ircNet  [lindex $argv 0] set ircPort [lindex$argv 1]
set nick    "thelistbot"
set user    "list 8 * : List Bot"

spawn telnet $ircNet$ircPort

sleep 3
send "NICK $nick\r\n" sleep 1 send "USER$user\r\n"
sleep 1
send "LIST\r\n"

interact

then

ircNet="irc.oftc.net"
listIrc $ircNet 6667 | tee$ircNet.list
grep \#tor \$ircNet.list

One must realize that interact statement and sleep timings in my script are pretty arbitrary. The script, however, does what it should for most connections and most IRC servers.

### Gitter IRC backend

Turns out, ung-dly service “gitter” has IRC backend. Still, it’s pretty awful: it drops messages when another client is connected to gitter with the same credentials, however it sorta works.

Here you can get instructions, written in ugly-backlit neon font.

Updated on January 29, 2015

as it turns out, as for now Gitter’s IRC backend is beyond unusable. Unlike in-browser client, this backend doesn’t shuffle messages randomly, neither have we observed it assigning authorship of a message to a wrong user. However, for large and active rooms, IRC backend proven to start dropping messages (not showing those at all) with no obvious pattern. And it doesn’t have anything to do with poor, if not lacking, multisession support of Gitter, problem persists even when we’re sure that no other sessions of the same user are initialized. I wouldn’t recommend using gitter for anything serious. (Cough, hello, webpack cough).