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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 /dev/tcp
#---------------------------------------------------------------------
# A list of features supported
# These are used: ipv4, ipv6, ssl, nossl, bind
transport_supports="ipv4 ipv6 nossl"
# Check if all the stuff needed to use this transport is available
# Return status
# 0 yes
# 1 no
transport_check_support() {
# If anyone can tell me how to check if /dev/tcp is supported
# without trying to make a connection (that could fail for so
# many other reasons), please contact me.
echo "NOTE: It is possible that this transport is not supported on your system"
echo " However, there is no way it can be checked except trying to connect."
echo " If you see an error below try netcat or socat transport instead."
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.
# $4 IP to bind to if any and if supported
# If the module does not support it, just ignore it.
# Return status
# 0 if Ok
# 1 if connection failed
transport_connect() {
exec 3<&-
exec 3<> "/dev/tcp/${1}/${2}"
time_get_current 'transport_lastvalidtime'
}
# Called to close connection
# No parameters, no return code check
transport_disconnect() {
exec 3<&-
# To force code to consider this disconnected.
transport_lastvalidtime=0
}
# Return status
# 0 If connection is still alive
# 1 If it isn't.
transport_alive() {
local newtime=
time_get_current 'newtime'
(( newtime - transport_lastvalidtime > 300 )) && return 1
return 0
}
# Return a line in the variable line.
# Return status
# 0 If Ok
# 1 If connection failed
transport_read_line() {
while true
do
ze_length="$( wc -l '/tmp/un-provoked-message-store' 2> /dev/null )"
if [[ -r /tmp/un-provoked-message-store ]] &&
[[ -w /tmp/un-provoked-message-store ]] && (( ${ze_length%% *} ))
then
read -r line < /tmp/un-provoked-message-store
line=':'${INJECT_NICK}'!~user@2001:ba8:1f1:f216::5 PRIVMSG #parabola :'"${line}"
# remove the top line of the file
if (( ${ze_length%% *} < 2 ))
then
echo -n > /tmp/un-provoked-message-store
else
tail -n +2 /tmp/un-provoked-message-store |
sponge /tmp/un-provoked-message-store
fi
break
else
read -t 5 -ru 3 line
the_return_code="${?}"
(( the_return_code == 0 )) && break
(( the_return_code > 128 )) && continue
[[ "${the_return_code}" -ne 0 ]] && return
fi
done
time_get_current 'transport_lastvalidtime'
line=${line//$'\r'/}
}
# Send a line
# Parameters
# $* send this
# Return code not checked.
transport_write_line() {
echo "$*" >&3
}
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