require "socket"
# Don't allow use of "tainted" data by potentially dangerous operations
$SAFE=1
# The irc class, which talks to the server and holds the main event loop
class IRC
def initialize(server, port, nick, pass, channel)
@server = server
@port = port
@nick = nick
@pass = pass
@channel = channel
end
def send(s)
# Send a message to the irc server and print it to the screen
puts "--> #{s}"
@irc.send "#{s}\n", 0
end
def connect()
# Connect to the IRC server
@irc = TCPSocket.open(@server, @port)
send "USER blah blah blah :blah blah"
send "NICK #{@nick}"
send "PASS #{@pass}"
send "JOIN #{@channel}"
end
def evaluate(s)
# Make sure we have a valid expression (for security reasons), and
# evaluate it if we do, otherwise return an error message
if s =~ /^[-+*\/\d\s\eE.()]*$/ then
begin
s.untaint
return eval(s).to_s
rescue Exception => detail
puts detail.message()
end
end
return "Error"
end
def handle_server_input(s)
# This isn't at all efficient, but it shows what we can do with Ruby
# (Dave Thomas calls this construct "a multiway if on steroids")
case s.strip
when /^PING :(.+)$/i
puts "[ Server ping ]"
send "PONG :#{$1}"
when /^:(.+?)!(.+?)@(.+?)\sPRIVMSG\s.+\s:[\001]PING (.+)[\001]$/i
puts "[ CTCP PING from #{$1}!#{$2}@#{$3} ]"
send "NOTICE #{$1} :\001PING #{$4}\001"
when /^:(.+?)!(.+?)@(.+?)\sPRIVMSG\s.+\s:[\001]VERSION[\001]$/i
puts "[ CTCP VERSION from #{$1}!#{$2}@#{$3} ]"
send "NOTICE #{$1} :\001VERSION Ruby-irc v0.042\001"
when /^:(.+?)!(.+?)@(.+?)\sPRIVMSG\s(.+)\s:EVAL (.+)$/i
puts "[ EVAL #{$5} from #{$1}!#{$2}@#{$3} ]"
send "PRIVMSG #{(($4==@nick)?$1:$4)} :#{evaluate($5)}"
else
puts s
end
end
def main_loop()
# Just keep on truckin' until we disconnect
while true
ready = select([@irc, $stdin], nil, nil, nil)
next if !ready
for s in ready[0]
if s == $stdin then
return if $stdin.eof
s = $stdin.gets
send s
elsif s == @irc then
return if @irc.eof
s = @irc.gets
handle_server_input(s)
end
end
end
end
end
# The main program
# If we get an exception, then print it out and keep going (we do NOT want
# to disconnect unexpectedly!)
irc = IRC.new('SERVER', PORT, 'USERNAME', 'PASSWORD', '#IRC CHANNEL')
irc.connect()
begin
irc.main_loop()
rescue Interrupt
rescue Exception => detail
puts detail.message()
print detail.backtrace.join("\n")
retry
end
