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#!/bin/bash
#
# Copyright (C) Voltaire Ltd. 2006. ALL RIGHTS RESERVED.
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# Author: Dan Bar Dov <danb@voltaire.com>
# iscsi_discovery:
# * does a send-targets discovery to the given IP
# * set the transport type to the preferred transport (or tcp is -t flag is not used)
# * tries to login
# * if succeeds,
# o logout,
# o mark record autmatic (unless -m flag is used)
# * else
# o reset transport type to TCP
# o try to login
# o if succeeded
# + logout
# + mark record automatic (unless -m flag is used)
#
usage()
{
echo "Usage: $0 <IP> [-p <port>] [-d] [-t <tcp|iser> [-f]] [-m] [-l]"
echo "Options:"
echo "-p set the port number (default is 3260)."
echo "-d print debugging information"
echo "-t set transport (default is tcp)."
echo "-f force specific transport -disable the fallback to tcp (default is fallback enabled)."
echo " force the transport specified by the argument of the -t flag."
echo "-m manual startup - will set manual startup (default is automatic startup)."
echo "-l login to the new discovered nodes (default is false)."
}
dbg()
{
$debug && echo $@
}
initialize()
{
trap "exit" 2
debug=false
force="0"
log_out="1"
startup_manual="0"
#set default transport to tcp
transport=tcp
#set default port to 3260
port=3260;
}
parse_cmdline()
{
if [ $# -lt 1 ]; then
usage
exit 1
fi
# check if the IP address is valid
ip=`echo $1 | awk -F'.' '$1 != "" && $1 <=255 && $2 != "" && $2 <= 255 && $3 != "" && $3 <= 255 && $4 != "" && $4 <= 255 {print $0}'`
if [ -z "$ip" ]; then
echo "$1 is not a vaild IP address!"
exit 1
fi
shift
while getopts "dfmlt:p:" options; do
case $options in
d ) debug=true;;
f ) force="1";;
t ) transport=$OPTARG;;
p ) port=$OPTARG;;
m ) startup_manual="1";;
l ) log_out=0;;
\? ) usage
exit 1;;
* ) usage
exit 1;;
esac
done
}
discover()
{
# If open-iscsi is already logged in to the portal, exit
if [ $(iscsiadm -m session | grep -c ${ip}:${port}) -ne 0 ]; then
echo "Please logout from all targets on ${ip}:${port} before trying to run discovery on that portal"
exit 2
fi
connected=0
discovered=0
dbg "starting discovery to $ip"
disc="$(iscsiadm -m discovery --type sendtargets --portal ${ip}:${port})"
echo "${disc}" | while read portal target
do
portal=${portal%,*}
select_transport
done
discovered=$(echo "${disc}" | wc -l)
if [ ${discovered} = 0 ]; then
echo "failed to discover targets at ${ip}"
exit 2
else
echo "discovered ${discovered} targets at ${ip}"
fi
}
try_login()
{
if [ "$startup_manual" != "1" ]; then
iscsiadm -m node --targetname ${target} --portal ${portal} --op update -n node.conn[0].startup -v automatic
fi
iscsiadm -m node --targetname ${target} --portal ${portal} --login >/dev/null 2>&1
ret=$?
if [ ${ret} = 0 ]; then
echo "Set target ${target} to automatic login over ${transport} to portal ${portal}"
((connected++))
if [ "$log_out" = "1" ]; then
iscsiadm -m node --targetname ${target} --portal ${portal} --logout
fi
else
echo "Cannot login over ${transport} to portal ${portal}"
iscsiadm -m node --targetname ${target} --portal ${portal} --op update -n node.conn[0].startup -v manual
fi
return ${ret}
}
set_transport()
{
transport=$1
case "$transport" in
iser)
# iSER does not use digest
iscsiadm -m node --targetname ${target} --portal ${portal} \
--op update -n node.conn[0].iscsi.HeaderDigest -v None
iscsiadm -m node --targetname ${target} --portal ${portal} \
--op update -n node.conn[0].iscsi.DataDigest -v None
;;
cxgb3i)
# cxgb3i supports <= 16K packet (BHS + AHS + pdu payload + digests)
iscsiadm -m node --targetname ${target} --portal ${portal} \
--op update -n node.conn[0].iscsi.MaxRecvDataSegmentLength \
-v 8192
;;
esac
transport_name=`iscsiadm -m node -p ${portal} -T ${target} |awk '/transport_name/ {print $1}'`
iscsiadm -m node --targetname ${target} --portal ${portal} \
--op update -n ${transport_name} -v ${transport}
}
select_transport()
{
set_transport $transport
dbg "Testing $transport-login to target ${target} portal ${portal}"
try_login;
if [ $? != 0 -a "$force" = "0" ]; then
set_transport tcp
dbg "starting to test tcp-login to target ${target} portal ${portal}"
try_login;
fi
}
check_iscsid()
{
#check if iscsid is running
pidof iscsid &>/dev/null
ret=$?
if [ $ret -ne 0 ]; then
echo "iscsid is not running"
echo "Exiting..."
exit 1
fi
}
check_iscsid
initialize
parse_cmdline "$@"
discover