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#! /bin/sh
#
# carp-hast-switch: shell script for change hast role when carp
#                   status is changed.
#

# Original script by Freddie Cash <fjwcash@gmail.com>
# Modified by Michael W. Lucas <mwlucas@BlackHelicopters.org>
# and Viktor Petersson <vpetersson@wireload.net>
# and HEO SeonMeyong <seirios@seirios.org>
# Last modified 2015/11/10 HEO SeonMeyong <seirios@seirios.org>

# ***WARNINGS***
# Need net.inet.carp.preempt=1 and same of advskew on carp.
# Currently HAST device must formatted by UFS
# ZFS code is impremented but not checked.
#     This script is assumed to match the ZFS pool name and HAST resource name 

##############################################################################
# Setting Variables and parse Arguments.

#DEBUG=1
SYSLOG_FACILITY="user.notice"
SYSLOG_TAG="carp-hast"

IF=${1%@*}
VHID=${1#*@}
ACTION=$2

# Work around for boot time. devd execute this script before start hastd.
[ ! `/bin/pgrep hastd` ] && exit

case "${ACTION}" in
    MASTER|BACKUP|INIT)
	/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
		        "State Changed. I/F: ${IF} VHID: ${VHID} state: ${ACTION}"
	;;
    *)
	/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                        "FATAL: ${ACTION} is not yet implemented"
	exit 1
	;;
esac

##############################################################################
# Get resources.

HASTDEV=`/sbin/hastctl dump all | /usr/bin/grep resource | /usr/bin/sed -e 's/^.*:\ *//'`
[ "x"$DEBUG != "x" ] && echo "HASTDEV = ${HASTDEV}"
[ -z "${HASTDEV}" ] && exit 0		# no hast device.

# get all carp interfaces
ifs=`/sbin/ifconfig -l`
for i in ${ifs}; do
    no_of_carp=`/sbin/ifconfig $i | /usr/bin/grep -c carp`
    [ "x"$DEBUG != "x" ] && echo "Interface $i has ${no_of_carp} CARP configuration"
    [ ${no_of_carp} != "0" ] && carps="${carps} $i"
done
[ "x"$DEBUG != "x" ] && echo "CARP I/F = ${carps}"
[ -z "${carps}" ] && exit 0		# no carp I/F.

PREEMPTION=`/sbin/sysctl net.inet.carp.preempt | /usr/bin/awk '{print $2}'`
[ "x"$DEBUG != "x" ] && echo "CARP preemption = ${PREEMPTION}"
[ ${PREEMPTION} != "1" ] && exit 0	# No carp preemption. May cause failure.

##############################################################################
# Main.

case "${ACTION}" in
    "MASTER")
	# make sure all carp is master.
	if [ -n "${carps}" ]; then
	    for if in ${carps}; do
		vhid=`/sbin/ifconfig ${if} | /usr/bin/grep carp | /usr/bin/awk '{print $3 " " $4}'`
		/sbin/ifconfig ${if} ${vhid} state master
	    done
	fi

	for disk in ${HASTDEV}; do
            # If there is secondary worker process, it means that remote primary process is
            # still running. We have to wait for it to terminate.
            for i in `jot 30`; do
                /bin/pgrep -f "hastd: ${disk} \(secondary\)" >/dev/null 2>&1 || break
		sleep 1
	    done
            if pgrep -f "hastd: ${disk} \(secondary\)" >/dev/null 2>&1; then
	        /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
		                "FATAL: Secondary process for resource ${disk} is still running after 30 seconds."
                exit 1
            fi
	    
	    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
		            "Role for HAST resources ${disk} switched to primary."
	    /sbin/hastctl role primary ${disk}
	    if [ $? -ne 0 ]; then
		/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
			        "FATAL: Unable to change role to primary for resource ${disk}."
		exit 1
	    fi
	done
	
	# Wait for the /dev/hast/* devices to appear
	for disk in ${HASTDEV}; do
	    for loop in $( jot 120 ); do
		[ -c "/dev/hast/${disk}" ] && break
		sleep 0.5
	    done
	    
	    if [ ! -c "/dev/hast/${disk}" ]; then
		/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
			        "FATAL: GEOM provider /dev/hast/${disk} did not appear."
		exit 1
	    fi
            FSFMT=`file -bs /dev/hast/${disk}`
            if [ $? -ne 0 ]; then
		/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
			        "FATAL: /dev/hast/${disk} cannot define FS format."
		exit 1
            fi
            FSFMT=`echo ${FSFMT} | /usr/bin/awk '{print $1 " " $2}'`
            case ${FSFMT} in
                "Unix Fast")
                    /sbin/fsck -y -t ufs /dev/hast/${disk} >/dev/null 2>&1
                    if [ $? -ne 0 ]; then
                        /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                        "FATAL: UFS fsck /dev/hast/${disk} failed."
                        exit 1
                    fi
                    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                    "fsck /dev/hast/${disk} finished."
 	            e_code=`/sbin/mount /dev/hast/${disk} /hast/${disk} 2>&1`
                    if [ $? -ne 0 ]; then
	                /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
		                        "FATAL: UFS mount for resource ${disk} failed: ${e_code}."
                        exit 1
                    fi
                    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                    "UFS /dev/hast/${disk} is mounted."
                    ;;
                *)
                    # If not UFS, Assume that filesystem is ZFS.
                    e_code=`/sbin/zpool import -f ${disk} 2>&1`
                    if [ $? -ne 0 ]; then
	                /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                        "FATAL: ZFS import for resource ${disk} failed: ${e_code}."
                        exit 1
                    fi
                    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                    "ZFS ${disk} is imported."
                    ;;
            esac
	done
        # NFS Service ( run nfsd and mountd. )
	/usr/sbin/service rpcbind restart
	/usr/sbin/service statd restart
	/usr/sbin/service lockd restart
        /usr/sbin/service nfsd restart
        /usr/sbin/service mountd restart
	/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
			"NFS started."

	# iSCSI service
	# /etc/rc.d/iscsi_target start
	;;
    
    "BACKUP"|"INIT")
	# make sure all carp is backup
	if [ -n "${carps}" ]; then
	    for if in ${carps}; do
		vhid=`/sbin/ifconfig ${if} | /usr/bin/grep carp | /usr/bin/awk '{print $3 " " $4}'`
		/sbin/ifconfig ${if} ${vhid} state backup
	    done
	fi
	
        # stop iSCSI service
	# /etc/rc.d/iscsi_target forcestop

        # NFS Service ( stop nfsd and mountd. ) 
        /usr/sbin/service mountd forcestop
        /usr/sbin/service nfsd forcestop
	/usr/sbin/service lockd forcestop
	/usr/sbin/service statd forcestop
	/usr/sbin/service rpcbind forcestop
	/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
			"NFS stoped."
	
	# Switch roles for the HAST resources
	for disk in ${HASTDEV}; do
	    sleep 1
	    # First of all, set hast status to secondary.
	    # Do not touch device before hast status become secondary.
	    # This work protects to become split-brain status.
	    /sbin/hastctl role secondary ${disk} 2>&1
	    if [ $? -ne 0 ]; then
		/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
			        "FATAL: Unable to switch role to secondary for resource ${disk}."
		exit 1
	    fi
	    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
		            "Role switched to secondary for resource ${disk}."
	    # Unmount UFS
            for i in `/sbin/mount | /usr/bin/awk '{print $1 ":" substr($4,2)}' | /usr/bin/grep hast`; do
                if [ ${i%:*} = "/dev/hast/${disk}" ]; then
                    if [ ${i#*:} = "ufs," ]; then
                        e_code=`/sbin/umount /hast/${disk} 2>&1`
                        if [ $? -ne 0 ]; then
			    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
					    "FATAL: UFS unmount of resource ${disk} failed: ${e_code}"
                            exit 1
                        fi
			/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
					"UFS /dev/hast/${disk} is unmounted"
                    fi
                fi
            done

	    # Export ZFS
            zpool list | egrep -q "^${disk} "
            if [ $? -eq 0 ]; then
                # Force export ZFS pool.
                e_code=`/sbin/zpool export -f ${disk} 2>&1`
	        if [ $? -ne 0 ]; then
		    /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                    "FATAL: ZFS export of resource ${disk} failed: ${e_code}."
		    exit 1
	        fi
                /usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
                                "ZFS ${disk} is exported."
            fi
	done
	;;
    
    *)
	/usr/bin/logger -p ${SYSLOG_FACILITY} -t ${SYSLOG_TAG} \
		        "Unknown CARP state. ${STATE}"
	;;
esac

exit 0
##############################################################################
# Local Variables:
# coding: utf-8
# mode: sh
# sh-basic-offset: 4
# sh-indentation: 4
# End: