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#!/bin/bash
# -*- coding: utf-8 -*-
###########################################################################
# #
# 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/>. #
# #
###########################################################################
#---------------------------------------------------------------------
## A transport module using netcat
#---------------------------------------------------------------------
# A list of features supported
# These are used: ipv4, ipv6, ssl, nossl, bind
# Yes I know some versions of netcat support encryption and some
# other ones support IPv6. I used GNU netcat and I couldn't find
# a way to detect what is supported in current netcat.
# Also those other netcat variants require you to pass some command
# line argument to enable use of IPv6. (nc6 doesn't)
# netcat got to many problems, use either dev-tcp or socat for
# non-SSL transport really!
transport_supports="ipv4 nossl bind"
# Check if all the stuff needed to use this transport is available
# Return status
# 0 yes
# 1 no
transport_check_support() {
[[ -x "$config_transport_netcat_path" ]] || {
log_fatal "Can't find netcat (needed for this transport)"
return 1
}
hash mkfifo >/dev/null 2>&1 || {
log_fatal "Can't find mkfifo (needed for this transport)"
return 1
}
return 0
}
# Try to connect
# Parameters
# $1 hostname/IP
# $2 port
# $3 If 1 use SSL. If the module does not support it, just ignore it.
# $4 IP to bind to if any and if supported
# If the module does not support it, just ignore it.
# Return status
# 0 if Ok
# 1 if connection failed
transport_connect() {
transport_tmp_dir_file="$(mktemp -dt envbot.netcat.XXXXXXXXXX)" || return 1
# To keep this simple, from client perspective.
# We WRITE to out and READ from in
mkfifo "${transport_tmp_dir_file}/in"
mkfifo "${transport_tmp_dir_file}/out"
exec 3<&-
exec 4<&-
local myargs
if [[ $4 ]]; then
myargs="-s $4"
fi
"$config_transport_netcat_path" "$1" "$2" < "${transport_tmp_dir_file}/out" > "${transport_tmp_dir_file}/in" &
transport_pid="$!"
echo "$transport_pid" >> "${transport_tmp_dir_file}/pid"
exec 3>"${transport_tmp_dir_file}/out"
exec 4<"${transport_tmp_dir_file}/in"
# To be able to wait for error.
sleep 2
kill -0 "$transport_pid" >/dev/null 2>&1 || return 1
time_get_current 'transport_lastvalidtime'
}
# Called to close connection
# No parameters, no return code check
transport_disconnect() {
# It might not be running.
kill "$(< "${transport_tmp_dir_file}/pid")" >/dev/null 2>&1
rm -rf "${transport_tmp_dir_file}"
exec 3<&-
exec 4<&-
# To force code to consider this disconnected.
transport_lastvalidtime=0
}
# Return status
# 0 If connection is still alive
# 1 If it isn't.
transport_alive() {
kill -0 "$transport_pid" >/dev/null 2>&1 || return 1
local newtime=
time_get_current 'newtime'
(( newtime - transport_lastvalidtime > 300 )) && return 1
return 0
}
# Return a line in the variable line.
# Return status
# 0 If Ok
# 1 If connection failed
transport_read_line() {
read -ru 4 line
# Fail.
if [[ $? -ne 0 ]]; then
return 1
else
time_get_current 'transport_lastvalidtime'
fi
line=${line//$'\r'/}
}
# Send a line
# Parameters
# $* send this
# Return code not checked.
transport_write_line() {
kill -0 "$transport_pid" >/dev/null 2>&1 && echo "$*" >&3
}
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