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#!/bin/bash
###########################################################################
# #
# envbot - an IRC bot in bash #
# Copyright (C) 2007-2008 Arvid Norlander #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <http://www.gnu.org/licenses/>. #
# #
###########################################################################
#-------------------------------------------------------------------------#
## This module filters known spam using +q and +z modes. ##
## It will relay any un-recognized message as: (nick said):. ##
## Requires: the 'ii' program to be installed ##
## Requires: (in bot_settings.sh) ##
## * $BECOME_OP_ON_JOIN non-zero ##
## * channel in $OP_CHANNELS ##
## * channel in $config_module_spamfilter_channels ##
#-------------------------------------------------------------------------#
readonly DEBUG=0
readonly RELAY_NICK='a-user'
readonly FILTER_CHANNELS="${config_module_spamfilter_channels}"
readonly II_DIR=/home/pbot/irc/${config_server}
readonly II_LOG_REGEX='[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2} '
readonly SPAMFILTER_CHANNELS="${config_module_spamfilter_channels}"
readonly BOT_PASS="${config_server_passwd}"
# known spam trigger constants
readonly SPAM=(
'blog by freenode staff'
'IRC investigative journalists'
'IRC ad service'
"Australia's #1 hacker"
'SP9002_@efnet'
'/!\ ATTN: '
'acquisition by Private'
'"denial" on the freenode blog'
' ICO scam'
'Oh, and about those donations she speaks of:'
'kaniini has invited you'
'watch the live defcon'
'All told, Handshake'
'Handshake cryptocurrency scam'
"Christel and Andrew Lee (PIA's founder)"
'is actively peddling this scam'
)
## setup/teardown ##
module_spamfilter_INIT()
{
modinit_API='2'
modinit_HOOKS='on_JOIN on_raw'
helpentry_module_spamfilter_description="Provides support for filtering known spam using +z mode."
}
module_spamfilter_UNLOAD()
{
return 0
}
module_spamfilter_REHASH()
{
return 0
}
## events ##
module_spamfilter_on_JOIN()
{
local whojoined=
local channel=$2
local bot_nick=${server_nick_current}
parse_hostmask_nick "$1" 'whojoined'
DBG_JOIN "${whojoined}" "${channel}"
if [[ "${whojoined}" == "${bot_nick}" ]] && \
[[ " ${SPAMFILTER_CHANNELS} " =~ " ${channel} " ]] && \
[[ " ${OP_CHANNELS} " =~ " ${channel} " ]] && (( ${BECOME_OP_ON_JOIN} ))
then send_modes "${channel}" '+qz $~a'
# launch a second bot so we can compare the chat logs
if which ii
then [[ -f ${II_DIR}/in ]] && printf "/quit\n" > ${II_DIR}/in ; sleep 2 ;
pkill ii ; sleep 2 ;
ii -s ${config_server} -n ${RELAY_NICK} -f "Spam Filter" & sleep 5 ;
# printf "/j NickServ IDENTIFY %s\n" ${BOT_PASS} > ${II_DIR}/in ; sleep 2 ;
printf "/j %s\n" "${channel}" > ${II_DIR}/in
DBG_RELAY_USER
else echo "ii is not installed"
fi
DBG_SET_MODE
fi
}
module_spamfilter_on_raw() # (raw_line)
{
local raw_line=$1
DBG_RAW_LINE "${raw_line}"
[[ "${raw_line}" =~ ^:([^ ]*)\ +PRIVMSG\ +([^:]+)\ +:(.*) ]] || return 0
local hostmask="${BASH_REMATCH[1]}"
local target="${BASH_REMATCH[2]}"
local query="${BASH_REMATCH[3]}"
local sender
parse_hostmask_nick "${hostmask}" 'sender'
local was_handled
DBG_CRITERIA "${sender}" "${target}" "${query}"
# ignore internal messages and chat from registered users
if ! is_filtered_channel "${target}" ||
is_internal_user "${sender}" ||
is_public_chat "${sender}" "${query}"
then was_handled=0
else
DBG_UNREGISTERED "${sender}"
# ignore chat that is known spam or otherwise nonsense
if is_spam "${query}"
then was_handled=1
DBG_SPAM ${sender}
# relay chat from an unregistered user to the channel
else
send_msg "${target}" "(${sender} said): ${query}"
#echo "(${sender} said): ${query}" > ${II_DIR}/${target}/in
was_handled=0
fi
fi
# supress or allow further handling of this message
return ${was_handled}
}
## helpers ##
is_internal_user() # (sender)
{
local sender=$1
[[ " ${RELAY_NICK} ${INJECT_NICK} " =~ " ${sender} " ]]
}
is_filtered_channel() # (target)
{
local target=$1
[[ " ${FILTER_CHANNELS} " =~ " ${target} " ]]
}
is_public_chat() # (sender , query)
{
local sender=$1
local query=$2
local log_line="<${sender}> ${query}"
local chat_log="$(sleep 2 ; tail -n 12 ${II_DIR}/${target}/out 2> /dev/null ;)"
[[ "${chat_log}" =~ ${II_LOG_REGEX}"${log_line}" ]]
}
is_spam() # (chat_msg)
{
local needle=$1
local haystack=("${SPAM[@]}")
local straw
for straw in "${haystack[@]}"; do [[ ${needle} = *"${straw}"* ]] && return 0 ; done ;
return 1
}
## DEBUG ##
DBG_JOIN() { (( ${DEBUG} )) || return ; local whojoined=$1 ; local channel=$2 ; echo "[SPAMFILTER]: whojoined=${whojoined} channel=${channel}" ; }
DBG_RELAY_USER() { (( ${DEBUG} )) && echo "[SPAMFILTER]: launched ii relay user: '${RELAY_NICK}'" ; }
DBG_SET_MODE() { (( ${DEBUG} )) && echo "[SPAMFILTER]: set mode +qz" ; }
DBG_RAW_LINE() { (( ${DEBUG} )) && echo -e "[SPAMFILTER]: incoming raw_line=\n\t'$1'" ; }
DBG_CRITERIA()
{
(( ${DEBUG} )) || return
local sender=$1
local target=$2
local query=$3
echo -n "[SPAMFILTER]: target='${target}'" ; ! is_filtered_channel "${target}" && echo -n " => wrong channel - returning" ; echo
echo -n "[SPAMFILTER]: sender='${sender}'" ; is_internal_user "${sender}" && echo -n " => from internal user - returning" ; echo
echo -n "[SPAMFILTER]: query='${query}'" ; is_public_chat "${sender}" "${query}" && echo -n " => from registered user - returning" ; echo
}
DBG_UNREGISTERED() { (( ${DEBUG} )) || return ; local sender=$1 ; echo "[SPAMFILTER]: unregistered user sender=${sender}" ; }
DBG_SPAM() { (( ${DEBUG} )) || return ; local sender=$1 ; echo "[SPAMFILTER]: !!!triggered!!! spambot=${sender}" ; }
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