#! /bin/sh
# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

case $0 in
    */*) dir0=`echo "$0" | sed 's,/[^/]*$,,'` ;;
    *) dir0=./ ;;
esac
. "$dir0/ovs-lib" || exit 1

for dir in "$sbindir" "$bindir" /sbin /bin /usr/sbin /usr/bin; do
    case :$PATH: in
        *:$dir:*) ;;
        *) PATH=$PATH:$dir ;;
    esac
done

## ----- ##
## start ##
## ----- ##

# Keep track of removed vports so we can reload them if needed
removed_vports=""

insert_mods () {
    # Try loading openvswitch again.
    action "Inserting openvswitch module" modprobe openvswitch

    for vport in $removed_vports; do
        # Don't treat failures to load vports as fatal error
        action "Inserting $vport module" modprobe $vport || true
    done
}

insert_mod_if_required () {
    # If this kernel has no module support, expect we're done.
    if test ! -e /proc/modules
    then
        log_success_msg "Kernel has no loadable module support. Skipping modprobe"
        return 0
    fi

    # If openvswitch is already loaded then we're done.
    test -e /sys/module/openvswitch -o -e /sys/module/openvswitch_mod && \
     return 0

    # Load openvswitch.  If that's successful then we're done.
    insert_mods && return 0

    # If the bridge module is loaded, then that might be blocking
    # openvswitch.  Try to unload it, if there are no bridges.
    test -e /sys/module/bridge || return 1
    bridges=`echo /sys/class/net/*/bridge | sed 's,/sys/class/net/,,g;s,/bridge,,g'`
    if test "$bridges" != "*"; then
        log_warning_msg "not removing bridge module because bridges exist ($bridges)"
        return 1
    fi
    action "removing bridge module" rmmod bridge || return 1

    # Try loading openvswitch again.
    insert_mods
}

ovs_vsctl () {
    ovs-vsctl --no-wait "$@"
}

set_system_ids () {
    set ovs_vsctl set Open_vSwitch .

    OVS_VERSION=`ovs-vswitchd --version | sed 's/.*) //;1q'`
    set "$@" ovs-version="$OVS_VERSION"

    case $SYSTEM_ID in
        random)
            id_file=$etcdir/system-id.conf
            uuid_file=$etcdir/install_uuid.conf
            if test -e "$id_file"; then
                SYSTEM_ID=`cat "$id_file"`
            elif test -e "$uuid_file"; then
                # Migrate from old file name.
                . "$uuid_file"
                SYSTEM_ID=$INSTALLATION_UUID
                echo "$SYSTEM_ID" > "$id_file"
            elif SYSTEM_ID=`uuidgen`; then
                echo "$SYSTEM_ID" > "$id_file"
            else
                log_failure_msg "missing uuidgen, could not generate system ID"
            fi
            ;;

        '')
            log_failure_msg "system ID not configured, please use --system-id"
            ;;

        *)
            ;;
    esac
    set "$@" external-ids:system-id="\"$SYSTEM_ID\""

    if test X"$SYSTEM_TYPE" != X; then
        set "$@" system-type="\"$SYSTEM_TYPE\""
    else
        log_failure_msg "no default system type, please use --system-type"
    fi

    if test X"$SYSTEM_VERSION" != X; then
        set "$@" system-version="\"$SYSTEM_VERSION\""
    else
        log_failure_msg "no default system version, please use --system-version"
    fi

    action "Configuring Open vSwitch system IDs" "$@" $extra_ids
}

check_force_cores () {
    if test X"$FORCE_COREFILES" = Xyes; then
        ulimit -c 67108864
    fi
}

del_transient_ports () {
    for port in `ovs-vsctl --bare -- --columns=name find port other_config:transient=true`; do
        ovs_vsctl -- del-port "$port"
    done
}

start_ovsdb () {
    check_force_cores

    if daemon_is_running ovsdb-server; then
        log_success_msg "ovsdb-server is already running"
    else
        # Create initial database or upgrade database schema.
        upgrade_db $DB_FILE $DB_SCHEMA || return 1

        # Start ovsdb-server.
        set ovsdb-server "$DB_FILE"
        for db in $EXTRA_DBS; do
            case $db in
                /*) ;;
                *) db=$dbdir/$db ;;
            esac

            if test ! -f "$db"; then
                log_warning_msg "$db (from \$EXTRA_DBS) does not exist."
            elif ovsdb-tool db-version "$db" >/dev/null; then
                set "$@" "$db"
            else
                log_warning_msg "$db (from \$EXTRA_DBS) cannot be read as a database (see error message above)"
            fi
        done
        set "$@" -vconsole:emer -vsyslog:err -vfile:info
        set "$@" --remote=punix:"$DB_SOCK"
        set "$@" --private-key=db:Open_vSwitch,SSL,private_key
        set "$@" --certificate=db:Open_vSwitch,SSL,certificate
        set "$@" --bootstrap-ca-cert=db:Open_vSwitch,SSL,ca_cert
        start_daemon "$OVSDB_SERVER_PRIORITY" "$OVSDB_SERVER_WRAPPER" "$@" \
            || return 1

        # Initialize database settings.
        ovs_vsctl -- init -- set Open_vSwitch . db-version="$schemaver" \
            || return 1
        set_system_ids || return 1
        if test X"$DELETE_BRIDGES" = Xyes; then
            for bridge in `ovs_vsctl list-br`; do
                ovs_vsctl del-br $bridge
            done
        fi
        if test X"$DELETE_TRANSIENT_PORTS" = Xyes; then
            del_transient_ports
        fi
    fi
}

add_managers () {
    # Now that ovs-vswitchd has started and completed its initial
    # configuration, tell ovsdb-server to conenct to the remote managers.  We
    # used to do this at ovsdb-server startup time, but waiting for
    # ovs-vswitchd to finish configuring means that remote managers see less
    # churn in the database at startup or restart.  (For example, managers
    # won't briefly see empty datapath-id or ofport columns for records that
    # exist at startup.)
    action "Enabling remote OVSDB managers" \
	ovs-appctl -t ovsdb-server ovsdb-server/add-remote \
	    db:Open_vSwitch,Open_vSwitch,manager_options
}

start_forwarding () {
    check_force_cores

    insert_mod_if_required || return 1

    if daemon_is_running ovs-vswitchd; then
        log_success_msg "ovs-vswitchd is already running"
    else
        # Increase the limit on the number of open file descriptors.
        # On Linux, ovs-vswitchd needs about three file descriptors
        # per bridge and "n-handler-threads" file descriptors per bridge
        # port, so this allows a very large number of bridges and ports.
        MAXFD=65535
        if [ $(ulimit -n) -lt $MAXFD ]; then
            ulimit -n $MAXFD
        fi

	    # Start ovs-vswitchd.
	    set ovs-vswitchd unix:"$DB_SOCK"
	    set "$@" -vconsole:emer -vsyslog:err -vfile:info
	    if test X"$MLOCKALL" != Xno; then
	        set "$@" --mlockall
	    fi
	    start_daemon "$OVS_VSWITCHD_PRIORITY" "$OVS_VSWITCHD_WRAPPER" "$@"
    fi
}

## ---- ##
## stop ##
## ---- ##

stop_ovsdb () {
    stop_daemon ovsdb-server
}

stop_forwarding () {
    stop_daemon ovs-vswitchd
}

## ----------------- ##
## force-reload-kmod ##
## ----------------- ##

internal_interfaces () {
    # Outputs a list of internal interfaces:
    #
    #   - There is an internal interface for every bridge, whether it
    #     has an Interface record or not and whether the Interface
    #     record's 'type' is properly set or not.
    #
    #   - There is an internal interface for each Interface record whose
    #     'type' is 'internal'.
    #
    # But ignore interfaces that don't really exist.
    for d in `(ovs_vsctl --bare \
                -- --columns=name find Interface type=internal \
		    -- list-br) | sort -u`
    do
        if test -e "/sys/class/net/$d"; then
	        printf "%s " "$d"
	    fi
    done
}

ovs_save () {
    bridges=`ovs_vsctl -- --real list-br`
    if [ -n "${bridges}" ] && \
        "$datadir/scripts/ovs-save" "$1" ${bridges} > "$2"; then
        chmod +x "$2"
        return 0
    fi
    [ -z "${bridges}" ] && return 0
}

save_ofports_if_required () {
    # Save OpenFlow port numbers if we are upgrading from a pre-1.10 branch.
    #
    # (Versions 1.10 and later save OpenFlow port numbers without assistance,
    # so we don't have to do anything for them.
    case `ovs-appctl version | sed 1q` in
        "ovs-vswitchd (Open vSwitch) 1."[0-9].*)
            action "Saving ofport values" ovs_save save-ofports \
                "${script_ofports}"
            ;;
    esac
}

save_flows_if_required () {
    if test X"$DELETE_BRIDGES" != Xyes; then
        action "Saving flows" ovs_save save-flows "${script_flows}"
    fi
}

save_interfaces () {
    "$datadir/scripts/ovs-save" save-interfaces ${ifaces} \
        > "${script_interfaces}"
}

restore_ofports () {
    [ -x "${script_ofports}" ] && \
        action "Restoring ofport values" "${script_ofports}"
}

flow_restore_wait () {
    ovs_vsctl set open_vswitch . other_config:flow-restore-wait="true"
}

flow_restore_complete () {
    ovs_vsctl --if-exists remove open_vswitch . other_config \
        flow-restore-wait="true"
}

restore_flows () {
    [ -x "${script_flows}" ] && \
        action "Restoring saved flows" "${script_flows}"
}

restore_interfaces () {
    [ ! -x "${script_interfaces}" ] && return 0
    action "Restoring interface configuration" "${script_interfaces}"
    rc=$?
    if test $rc = 0; then
        level=debug
    else
        level=err
    fi
    log="logger -p daemon.$level -t ovs-save"
    $log "interface restore script exited with status $rc:"
    $log -f "$script_interfaces"
}

init_restore_scripts () {
    script_interfaces=`mktemp`
    script_flows=`mktemp`
    script_ofports=`mktemp`
    trap 'rm -f "${script_interfaces}" "${script_flows}" "${script_ofports}"' 0
}

force_reload_kmod () {
    ifaces=`internal_interfaces`
    action "Detected internal interfaces: $ifaces" true

    init_restore_scripts
    save_flows_if_required
    save_ofports_if_required

    # Restart the database first, since a large database may take a
    # while to load, and we want to minimize forwarding disruption.
    stop_ovsdb
    start_ovsdb

    # Restore of ofports should happen before vswitchd is restarted.
    restore_ofports

    stop_forwarding

    if action "Saving interface configuration" save_interfaces; then
        :
    else
        log_warning_msg "Failed to save configuration, not replacing kernel module"
        start_forwarding
        add_managers
        exit 1
    fi
    chmod +x "$script_interfaces"

    for dp in `ovs-dpctl dump-dps`; do
        action "Removing datapath: $dp" ovs-dpctl del-dp "$dp"
    done

    for vport in `awk '/^vport_/ { print $1 }' /proc/modules`; do
        action "Removing $vport module" rmmod $vport
        if ! grep -q $vport /proc/modules; then
            removed_vports="$removed_vports $vport"
        fi
    done

    # try both old and new names in case this is post upgrade
    if test -e /sys/module/openvswitch_mod; then
        action "Removing openvswitch module" rmmod openvswitch_mod
    elif test -e /sys/module/openvswitch; then
        action "Removing openvswitch module" rmmod openvswitch
    fi

    # Start vswitchd by asking it to wait till flow restore is finished.
    flow_restore_wait
    start_forwarding

    # Restore saved flows and inform vswitchd that we are done.
    restore_flows
    flow_restore_complete
    add_managers

    restore_interfaces

    "$datadir/scripts/ovs-check-dead-ifs"
}

## ------- ##
## restart ##
## ------- ##

save_interfaces_if_required () {
    # Save interfaces if we are upgrading from a pre-1.10 branch.
    case `ovs-appctl version | sed 1q` in
        "ovs-vswitchd (Open vSwitch) 1."[0-9].*)
            ifaces=`internal_interfaces`
            action "Detected internal interfaces: $ifaces" true
            if action "Saving interface configuration" save_interfaces; then
                chmod +x "$script_interfaces"
            fi
            ;;
    esac
}

restart () {
    if daemon_is_running ovsdb-server && daemon_is_running ovs-vswitchd; then
        init_restore_scripts
        save_interfaces_if_required
        save_flows_if_required
        save_ofports_if_required
    fi

    # Restart the database first, since a large database may take a
    # while to load, and we want to minimize forwarding disruption.
    stop_ovsdb
    start_ovsdb

    # Restore of ofports, if required, should happen before vswitchd is
    # restarted.
    restore_ofports

    stop_forwarding

    # Start vswitchd by asking it to wait till flow restore is finished.
    flow_restore_wait
    start_forwarding

    # Restore saved flows and inform vswitchd that we are done.
    restore_flows
    flow_restore_complete
    add_managers

    # Restore the interfaces if required. Return true even if restore fails.
    restore_interfaces || true
}

## --------------- ##
## enable-protocol ##
## --------------- ##

enable_protocol () {
    # Translate the protocol name to a number, because "iptables -n -L" prints
    # some protocols by name (despite the -n) and therefore we need to look for
    # both forms.
    #
    # (iptables -S output is more uniform but old iptables doesn't have it.)
    protonum=`grep "^$PROTOCOL[ 	]" /etc/protocols | awk '{print $2}'`
    if expr X"$protonum" : X'[0-9]\{1,\}$' > /dev/null; then :; else
        log_failure_msg "unknown protocol $PROTOCOL"
        return 1
    fi

    name=$PROTOCOL
    match="(\$2 == \"$PROTOCOL\" || \$2 == $protonum)"
    insert="iptables -I INPUT -p $PROTOCOL"
    if test X"$DPORT" != X; then
        name="$name to port $DPORT"
        match="$match && /dpt:$DPORT/"
        insert="$insert --dport $DPORT"
    fi
    if test X"$SPORT" != X; then
        name="$name from port $SPORT"
        match="$match && /spt:$SPORT/"
        insert="$insert --sport $SPORT"
    fi
    insert="$insert -j ACCEPT"

    if (iptables -n -L INPUT) >/dev/null 2>&1; then
        if iptables -n -L INPUT | awk "$match { n++ } END { exit n == 0 }"
        then
            # There's already a rule for this protocol.  Don't override it.
            log_success_msg "iptables already has a rule for $name, not explicitly enabling"
        else
            action "Enabling $name with iptables" $insert
        fi
    elif (iptables --version) >/dev/null 2>&1; then
        action "cannot list iptables rules, not adding a rule for $name"
    else
        action "iptables binary not installed, not adding a rule for $name"
    fi
}

## ---- ##
## main ##
## ---- ##

set_defaults () {
    SYSTEM_ID=

    DELETE_BRIDGES=no
    DELETE_TRANSIENT_PORTS=no

    DAEMON_CWD=/
    FORCE_COREFILES=yes
    MLOCKALL=yes
    OVSDB_SERVER_PRIORITY=-10
    OVS_VSWITCHD_PRIORITY=-10
    OVSDB_SERVER_WRAPPER=
    OVS_VSWITCHD_WRAPPER=

    DB_FILE=$dbdir/conf.db
    DB_SOCK=$rundir/db.sock
    DB_SCHEMA=$datadir/vswitch.ovsschema
    EXTRA_DBS=

    PROTOCOL=gre
    DPORT=
    SPORT=

    type_file=$etcdir/system-type.conf
    version_file=$etcdir/system-version.conf

    if test -e "$type_file" ; then
        SYSTEM_TYPE=`cat $type_file`
        SYSTEM_VERSION=`cat $version_file`
    elif (lsb_release --id) >/dev/null 2>&1; then
        SYSTEM_TYPE=`lsb_release --id -s`
        system_release=`lsb_release --release -s`
        system_codename=`lsb_release --codename -s`
        SYSTEM_VERSION="${system_release}-${system_codename}"
    else
        SYSTEM_TYPE=unknown
        SYSTEM_VERSION=unknown
    fi
}

usage () {
    set_defaults
    cat <<EOF
$0: controls Open vSwitch daemons
usage: $0 [OPTIONS] COMMAND

This program is intended to be invoked internally by Open vSwitch startup
scripts.  System administrators should not normally invoke it directly.

Commands:
  start              start Open vSwitch daemons
  stop               stop Open vSwitch daemons
  restart            stop and start Open vSwitch daemons
  status             check whether Open vSwitch daemons are running
  version            print versions of Open vSwitch daemons
  load-kmod          insert modules if not already present
  force-reload-kmod  save OVS network device state, stop OVS, unload kernel
                     module, reload kernel module, start OVS, restore state
  enable-protocol    enable protocol specified in options with iptables
  help               display this help message

One of the following options is required for "start", "restart" and "force-reload-kmod":
  --system-id=UUID   set specific ID to uniquely identify this system
  --system-id=random  use a random but persistent UUID to identify this system

Other important options for "start", "restart" and "force-reload-kmod":
  --system-type=TYPE  set system type (e.g. "XenServer")
  --system-version=VERSION  set system version (e.g. "5.6.100-39265p")
  --external-id="key=value"
                     add given key-value pair to Open_vSwitch external-ids
  --delete-bridges   delete all bridges just before starting ovs-vswitchd

Less important options for "start", "restart" and "force-reload-kmod":
  --daemon-cwd=DIR               set working dir for OVS daemons (default: $DAEMON_CWD)
  --no-force-corefiles           do not force on core dumps for OVS daemons
  --no-mlockall                  do not lock all of ovs-vswitchd into memory
  --ovsdb-server-priority=NICE   set ovsdb-server's niceness (default: $OVSDB_SERVER_PRIORITY)
  --ovs-vswitchd-priority=NICE   set ovs-vswitchd's niceness (default: $OVS_VSWITCHD_PRIORITY)

Debugging options for "start", "restart" and "force-reload-kmod":
  --ovsdb-server-wrapper=WRAPPER
  --ovs-vswitchd-wrapper=WRAPPER
  --ovs-vswitchd-wrapper=WRAPPER
     run specified daemon under WRAPPER (either 'valgrind' or 'strace')

File location options:
  --db-file=FILE     database file name (default: $DB_FILE)
  --db-sock=SOCKET   JSON-RPC socket name (default: $DB_SOCK)
  --db-schema=FILE   database schema file name (default: $DB_SCHEMA)

Options for "enable-protocol":
  --protocol=PROTOCOL  protocol to enable with iptables (default: gre)
  --sport=PORT       source port to match (for tcp or udp protocol)
  --dport=PORT       ddestination port to match (for tcp or udp protocol)

Other options:
  -h, --help                  display this help message
  -V, --version               display version information

Default directories with "configure" option and environment variable override:
  logs: @LOGDIR@ (--with-logdir, OVS_LOGDIR)
  pidfiles and sockets: @RUNDIR@ (--with-rundir, OVS_RUNDIR)
  conf.db: @DBDIR@ (--with-dbdir, OVS_DBDIR)
  system configuration: @sysconfdir@ (--sysconfdir, OVS_SYSCONFDIR)
  data files: @pkgdatadir@ (--pkgdatadir, OVS_PKGDATADIR)
  user binaries: @bindir@ (--bindir, OVS_BINDIR)
  system binaries: @sbindir@ (--sbindir, OVS_SBINDIR)

Please report bugs to bugs@openvswitch.org (see REPORTING-BUGS for details).
EOF

    exit 0
}

set_option () {
    var=`echo "$option" | tr abcdefghijklmnopqrstuvwxyz- ABCDEFGHIJKLMNOPQRSTUVWXYZ_`
    eval set=\${$var+yes}
    eval old_value=\$$var
    if test X$set = X || \
        (test $type = bool && \
        test X"$old_value" != Xno && test X"$old_value" != Xyes); then
        echo >&2 "$0: unknown option \"$arg\" (use --help for help)"
        return
    fi
    eval $var=\$value
}

daemons () {
    echo ovsdb-server ovs-vswitchd
}

set_defaults
extra_ids=
command=
for arg
do
    case $arg in
        -h | --help)
            usage
            ;;
        -V | --version)
            echo "$0 (Open vSwitch) $VERSION"
            exit 0
            ;;
        --external-id=*)
            value=`expr X"$arg" : 'X[^=]*=\(.*\)'`
            case $value in
                *=*)
                    extra_ids="$extra_ids external-ids:$value"
                    ;;
                *)
                    echo >&2 "$0: --external-id argument not in the form \"key=value\""
                    exit 1
                    ;;
            esac
            ;;
        --[a-z]*=*)
            option=`expr X"$arg" : 'X--\([^=]*\)'`
            value=`expr X"$arg" : 'X[^=]*=\(.*\)'`
            type=string
            set_option
            ;;
        --no-[a-z]*)
            option=`expr X"$arg" : 'X--no-\(.*\)'`
            value=no
            type=bool
            set_option
            ;;
        --[a-z]*)
            option=`expr X"$arg" : 'X--\(.*\)'`
            value=yes
            type=bool
            set_option
            ;;
        -*)
            echo >&2 "$0: unknown option \"$arg\" (use --help for help)"
            exit 1
            ;;
        *)
            if test X"$command" = X; then
                command=$arg
            else
                echo >&2 "$0: exactly one non-option argument required (use --help for help)"
                exit 1
            fi
            ;;
    esac
done
case $command in
    start)
        start_ovsdb || exit 1
        start_forwarding
        add_managers
        ;;
    stop)
        stop_forwarding
        stop_ovsdb
        ;;
    restart)
        restart
        ;;
    status)
        rc=0
        for daemon in `daemons`; do
            daemon_status $daemon || rc=$?
        done
        exit $rc
        ;;
    version)
        for daemon in `daemons`; do
            $daemon --version
        done
        ;;
    force-reload-kmod)
	    force_reload_kmod
        ;;
    load-kmod)
        insert_mod_if_required
        ;;
    enable-protocol)
        enable_protocol
        ;;
    help)
        usage
        ;;
    '')
        echo >&2 "$0: missing command name (use --help for help)"
        exit 1
        ;;
    *)
        echo >&2 "$0: unknown command \"$command\" (use --help for help)"
        exit 1
        ;;
esac