75 lines
3.1 KiB
Bash
75 lines
3.1 KiB
Bash
#!/bin/bash
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# -*- coding: utf-8 -*-
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###########################################################################
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# #
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# envbot - an IRC bot in bash #
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# Copyright (C) 2007-2008 EmErgE <halt.system@gmail.com> #
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# Copyright (C) 2007-2008 Arvid Norlander #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <http://www.gnu.org/licenses/>. #
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# #
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###########################################################################
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#---------------------------------------------------------------------
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## Calculate with bc
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## @Dependencies This module depends on bc
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## @Dependencies (http://www.gnu.org/software/bc/bc.html)
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#---------------------------------------------------------------------
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module_calc_INIT() {
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modinit_API='2'
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modinit_HOOKS=''
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if ! hash bc > /dev/null 2>&1; then
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log_error "Couldn't find \"bc\" command line tool. The calc module depend on that tool."
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return 1
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fi
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commands_register "$1" 'calc' || return 1
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helpentry_module_calc_description="Simple calculator module."
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helpentry_calc_calc_syntax='<expression>'
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helpentry_calc_calc_description='Try to calculate <expression> using bc.'
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}
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module_calc_UNLOAD() {
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return 0
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}
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module_calc_REHASH() {
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return 0
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}
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module_calc_handler_calc() {
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local sender="$1"
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local channel="$2"
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local sendernick=
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parse_hostmask_nick "$sender" 'sendernick'
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# If it isn't in a channel send message back to person who send it,
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# otherwise send in channel
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if ! [[ $2 =~ ^# ]]; then
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channel="$sendernick"
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fi
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local parameters="$3"
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# Sanity check on parameters
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parameters="$(tr -d '\n\r\t' <<< "$parameters")"
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if grep -Eq "scale=|read|while|if|for|break|continue|print|return|define|[e|j] *\(" <<< "$parameters"; then
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send_msg "$channel" "${sendernick}: Can't calculate that, it contains a potential unsafe/very slow function."
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elif [[ $parameters =~ \^[0-9]{4,} ]]; then
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send_msg "$channel" "${sendernick}: Some too large numbers."
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else
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# Force some security guards
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local myresult="$(ulimit -t 4; echo "$parameters" | bc -l 2>&1 | head -n 1)"
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send_msg "$channel" "${sendernick}: $myresult"
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fi
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}
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