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#!/bin/sh
#
# External STONITH module using IP Power 9258 or compatible devices.
#
# Copyright (c) 2010 Helmut Weymann (Helmut (at) h-weymann (dot) de)
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like. Any license provided herein, whether implied or
# otherwise, applies only to this software file. Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#

#
# Basic commands & parameters independent from individual device 

DEVICE="IP Power 9258"
IPPowerOn="1"
IPPowerOff="0"
IPGetPower="Set.cmd?CMD=GetPower"
IPSetPower="Set.cmd?CMD=SetPower"
IPPort_name="P"
IPPort0=60
HTTP_COMMAND="wget -q -O - --"
LOG_ERROR="ha_log.sh err"
LOG_WARNING="ha_log.sh warn"
LOG_INFO="ha_log.sh info"
LOG_DEBUG="ha_log.sh debug"
MY_COOKIES="cookies.txt"
MY_TEMPFILE="temp.htm"
PORT_STATUS="iocontrol.htm"
UNDEFINED_HOSTNAME="*not-defined*"

#
# check MY_ROOT_PATH for IP Power 9258 and create it if necessary
MY_ROOT_PATH="/var/run/heartbeat/rsctmp/ippower9258"

#
# script functions
#

get_challenge() {
	#
	# device sends a challenge for md5 encryption of username, password and challenge
	send_web_command - "http://$deviceip/" | grep Challenge | grep input | cut -d '"' -f 6
}

get_cookie_from_device(){
	# the form on the login page has these fields:
	# Username, Password, Challenge, Response, ScreenWidth
	#
    challenge=`get_challenge`
	response=`echo -n "$username$password$challenge" | md5sum | cut -b -32`
	postdata="Username=$username&Password=&Challenge=&Response=$response&ScreenWidth=1024"
	send_web_command " $MY_PATH/$MY_TEMPFILE --post-data=$postdata" "http://$deviceip/tgi/login.tgi"
	if grep -qs "Invalid User name or Password" $MY_PATH/$MY_TEMPFILE
	then
		$LOG_ERROR "Login to device $deviceip failed."
		$LOG_ERROR "Received Challenge = <<<$challenge>>>."
		$LOG_ERROR "Sent postdata = <<<$postdata>>>."
		exit 1
	fi
}

get_data_from_device() {
	# If successful all device info is available in MY_PATH
	rm -f "$MY_PATH/$PORT_STATUS"
	send_web_command "$MY_PATH/$PORT_STATUS" "http://$deviceip/$PORT_STATUS"
	if grep -qs "Cookie Time Out" $MY_PATH/$PORT_STATUS
	then
		$LOG_ERROR "received no port data from $deviceip (Cookie Time Out)"
		exit 1
	fi
}

send_http_request() {
	# ececution of http commands supported by the device
	$HTTP_COMMAND "http://$username:$password@$deviceip/$1"
}

send_web_command(){
	# ececution of web commands through the web-interface
	WEB_COMMAND="wget -q --keep-session-cookies"
	WEB_COMMAND="$WEB_COMMAND --load-cookies $MY_PATH/$MY_COOKIES"
	WEB_COMMAND="$WEB_COMMAND --save-cookies $MY_PATH/$MY_COOKIES"
	$WEB_COMMAND -O $1 -- $2
}

name2port() {
	local name=$1
	local i=$IPPort0
	for h in $device_hostlist ; do
		if [ $h = $name ]; then
			echo $IPPort_name$i
			return
		fi
		i=`expr $i + 1`
	done
	echo "invalid"
}

set_port() {
	#
	# port status is always set. Even if requested status is current status.
	# host status is not considered.
	local host=$1
	local requested_status=$2 # 0 or 1
	local port=`name2port $host`
	if [ "$port" = "invalid" ]
	then
		$LOG_ERROR "Host $host is not in hostlist ($hostlist) for $deviceip."
		exit 1
	fi
	ret=`send_http_request "$IPSetPower+$port=$requested_status" | cut -b 11`
	if [ "$ret" != "$requested_status" ]
	then
		$LOG_ERROR "$DEVICE at $deviceip responds with wrong status $ret for host $host at port $port."
		exit 1
	fi
	return 0
}

build_device_hostlist() {
	# 
	# hostnames are available from http://$deviceip/iocontrol.htm"
	# check for number of ports
	#
	device_hostlist=$(
	w3m -dump $MY_PATH/$PORT_STATUS | grep 'Power[1-8]' |
	sed 's/[^[]*\[//;s/\].*//;s/ *//' |
	while read h; do
		[ -z "$h" ] &&
			echo $UNDEFINED_HOSTNAME ||
			echo $h
	done
	)
	if [ x = x"$device_hostlist" ]; then
		$LOG_ERROR "cannot get hostlist for $deviceip"
		exit 1
	fi
	$LOG_DEBUG "Got new hostlist ($device_hostlist) from $deviceip"
}

filter_device_hostlist() {
	# check the given hostlist against the device hostlist
	local host
	for host in $device_hostlist; do
		[ "$host" != "$UNDEFINED_HOSTNAME" ] &&
			echo $host
	done
}

check_hostlist() {
	# check the given hostlist against the device hostlist
	local cnt=`echo "$hostlist" | wc -w`
	local cnt2=0
	local host
	for host in $hostlist; do
		if [ `name2port $host` != "invalid" ]; then
			cnt2=$((cnt2+1))
		else
			$LOG_ERROR "host $host not defined at $deviceip"
		fi
	done
	[ $cnt -ne $cnt2 ] &&
		exit 1
}

get_http_status() {
	pattern="P60=[01],P61=[01],P62=[01],P63=[01],P64=[01],P65=[01],P66=[01],P67=[01]"
	ret=`send_http_request "$IPGetPower" | grep $pattern`
	if [ "X$ret" = "X" ]
	then
		$LOG_ERROR "$DEVICE at $deviceip returns invalid or no string."
		exit 1
	fi
}

hostlist=`echo $hostlist | tr ',' ' '`
case $1 in
gethosts|on|off|reset|status)
	# need environment from stonithd
	# and device information from individual device
	#
	# default device username is admin
	# IP Power 9258 does not allow user management.
	#
	if [ "X$username" = "X" ]
	then
		username="admin"
	fi

	mkdir -p $MY_ROOT_PATH
	tmp_path="$deviceip" # ensure a simple unique pathname
	MY_PATH="$MY_ROOT_PATH/$tmp_path"
	mkdir -p $MY_PATH
	get_cookie_from_device
	get_data_from_device
	build_device_hostlist
	if [ "X$hostlist" = "X" ]; then
		hostlist="`filter_device_hostlist`"
	else
		check_hostlist
	fi
	;;
*)
	# the client is asking for meta-data
	;;
esac

target=`echo $2 | sed 's/[.].*//'`
# the necessary actions for stonithd
case $1 in
gethosts)
	echo $hostlist
	;;
on)
	set_port $target $IPPowerOn
	;;
off)
	set_port $target $IPPowerOff
	;;
reset)
	set_port $target $IPPowerOff
	sleep 5
	set_port $target $IPPowerOn
	;;
status)
	# werify http command interface
	get_http_status
	;;
getconfignames)
	# return all the config names
	for ipparam in deviceip username password hostlist
	do
		echo $ipparam
	done
	;;
getinfo-devid)
	echo "IP Power 9258"
	;;
getinfo-devname)
	echo "IP Power 9258 power switch"
	;;
getinfo-devdescr)
	echo "Power switch IP Power 9258 with 4 or 8 power outlets."
	echo "WARNING: It is different from IP Power 9258 HP"
	;;
getinfo-devurl)
	echo "http://www.aviosys.com/manual.htm"
	;;
getinfo-xml)
	cat << IPPOWERXML
<parameters>
<parameter name="deviceip" unique="1" required="1">
<content type="string" />
<shortdesc lang="en">
IP address or hostname of the device.
</shortdesc>
<longdesc lang="en">
The IP Address or the hostname of the device.
</longdesc>
</parameter>

<parameter name="password" unique="0" required="1">
<content type="string" />
<shortdesc lang="en">
Password
</shortdesc>
<longdesc lang="en">
The password to log in with.
</longdesc>
</parameter>

<parameter name="hostlist" unique="0" required="0">
<content type="string" />
<shortdesc lang="en">
Hostlist
</shortdesc>
<longdesc lang="en">
The list of hosts that the device controls.
If you leave this list empty, we will retrieve the hostnames from the device.
</longdesc>
</parameter>

<parameter name="username" unique="0" required="0">
<content type="string" default="admin"/>
<shortdesc lang="en">
Account Name
</shortdesc>
<longdesc lang="en">
The user to log in with.
</longdesc>
</parameter>

</parameters>
IPPOWERXML
	;;
*)
	$LOG_ERROR "Unexpected command $1 for $DEVICE at $deviceip."
	exit 1;
	;;
esac