From c40170cb03e41bd1efe775bbd430a50da6cdeea4 Mon Sep 17 00:00:00 2001
From: Joe <joe@joelightning.com>
Date: Thu, 10 Nov 2011 11:31:23 +0000
Subject: First commit, pbot-ng already works.

---
 transport/netcat.sh | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 transport/netcat.sh

(limited to 'transport/netcat.sh')

diff --git a/transport/netcat.sh b/transport/netcat.sh
new file mode 100644
index 0000000..49637e1
--- /dev/null
+++ b/transport/netcat.sh
@@ -0,0 +1,130 @@
+#!/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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