#!/bin/bash

# This replaces the old init.d script, and is run from the networking.service
# Only has start, stop, reload, because that's all systemd has.
# restart is implemented in systemd by stop then start.

RUN_DIR="/run/network"
IFSTATE_LOCKFILE="${RUN_DIR}/ifstatelock"

STATE_DIR="/var/tmp/network"
IFSTATE_FILE="${STATE_DIR}/ifstatenew"

NAME=networking

[ -x /sbin/ifup ] || exit 0
[ -x /sbin/ifdown ] || exit 0

CONFIGURE_INTERFACES=yes

EXTRA_ARGS=

[ -f /etc/default/networking ] && . /etc/default/networking

[ "$VERBOSE" = yes ] && EXTRA_ARGS=-v
[ "$DEBUG" = yes ] && EXTRA_ARGS="$EXTRA_ARGS -d"
[ "$SYSLOG" = yes ] && EXTRA_ARGS="$EXTRA_ARGS --syslog"

perf_options() {
    # At bootup lets set perfmode
    [ -f ${IFSTATE_LOCKFILE} ] && echo -n "" && return

    echo -n "--perfmode"
}

process_exclusions() {
    set -- $EXCLUDE_INTERFACES
    exclusions=""
    for d
    do
	exclusions="-X $d $exclusions"
    done
    echo $exclusions
}

check_network_file_systems() {
    [ -e /proc/mounts ] || return 0

    if [ -e /etc/iscsi/iscsi.initramfs ]; then
	echo ${NAME}':' "not deconfiguring network interfaces: iSCSI root is mounted."
	exit 0
    fi

    while read DEV MTPT FSTYPE REST; do
	case $DEV in
	/dev/nbd*|/dev/nd[a-z]*|/dev/etherd/e*)
	    echo ${NAME}':' "not deconfiguring network interfaces: network devices still mounted."
	    exit 0
	    ;;
	esac
	case $FSTYPE in
	nfs|nfs4|smbfs|ncp|ncpfs|cifs|coda|ocfs2|gfs|pvfs|pvfs2|fuse.httpfs|fuse.curlftpfs)
	    echo ${NAME}':' "not deconfiguring network interfaces: network file systems still mounted."
	    exit 0
	    ;;
	esac
    done < /proc/mounts
}

check_network_swap() {
    [ -e /proc/swaps ] || return 0

    while read DEV MTPT FSTYPE REST; do
	case $DEV in
	/dev/nbd*|/dev/nd[a-z]*|/dev/etherd/e*)
	    echo ${NAME}':' "not deconfiguring network interfaces: network swap still mounted."
	    exit 0
	    ;;
	esac
    done < /proc/swaps
}

ifup_hotplug () {
    if [ -d /sys/class/net ]
    then
	    ifaces=$(for iface in $(ifquery --list --allow=hotplug 2>/dev/null)
			    do
				    link=${iface##:*}
				    link=${link##.*}
				    if [ -e "/sys/class/net/$link" ]
				    then
				        echo "$iface"
				    fi
			    done)
	    if [ -n "$ifaces" ]
	    then
		ifup $ifaces "$@" || true
	    fi
    fi
}

ifup_mgmt () {
	ifaces=$(ifquery --list --allow=mgmt 2>/dev/null)
	if [ -n "$ifaces" ]; then
		echo "bringing up mgmt class interfaces"
		ifup --allow=mgmt
	fi
}

ifupdown_init() {
	# remove state file at boot
	[ ! -e ${IFSTATE_LOCKFILE} ] && rm -f ${IFSTATE_FILE}

	[ ! -e /run/network ] && mkdir -p /run/network &>/dev/null
	[ ! -e /etc/network/run ] && \
		ln -sf /run/network /etc/network/run &>/dev/null
}

case "$1" in
start)
	ifupdown_init
	if [ "$CONFIGURE_INTERFACES" = no ]
	then
	    echo ${NAME}':' "Not configuring network interfaces, see /etc/default/networking"
	    exit 0
	fi
	set -f
	exclusions=$(process_exclusions)
	perfoptions=$(perf_options)
	echo ${NAME}':' "Configuring network interfaces"
	ifup_mgmt
	ifup -a $EXTRA_ARGS $exclusions $perfoptions
	ifup_hotplug $HOTPLUG_ARGS $EXTRA_ARGS $exclusions
	;;
stop)
	if [ "$SKIP_DOWN_AT_SYSRESET" = "yes" ]; then
        SYSRESET=0
        systemctl list-jobs | egrep -q '(shutdown|reboot|halt|poweroff)\.target'
        [ $? -eq 0 ] && SYSRESET=1
        if [ $SYSRESET -eq 1 ]; then
            echo ${NAME}':' "Skipping deconfiguring network interfaces"
            exit 0
        fi
	fi
	ifupdown_init
	check_network_file_systems
	check_network_swap
	exclusions=$(process_exclusions)

	echo ${NAME}':' "Deconfiguring network interfaces"
	ifdown -a $EXTRA_ARGS $exclusions
	;;

reload)

	ifupdown_init
	exclusions=$(process_exclusions)

	echo ${NAME}':' "Reloading network interfaces configuration"
	ifreload -a $EXTRA_ARGS $exclusions
	;;

*)
	echo ${NAME}':' "Usage: $0 {start|stop|reload}"
	exit 1
	;;
esac

exit 0