#! /bin/bash
#
### BEGIN INIT INFO
# Provides: $network $named
# Should-Start: portreserve
# Required-Start: network
# Required-Stop: network
# Default-Start: 2 3 4 5
# Short-Description: Wait for the hotplugged network to be up
# Description: Wait for all network interfaces started asynchronously
#              at boot time.
### END INIT INFO

# Source function library.
. /etc/init.d/functions

NETWORKDELAY=20
DEFAULT_LINK_DETECTION_DELAY=2
MIN_LINK_DETECTION_DELAY=0
MAX_LINK_DETECTION_DELAY=$MIN_LINK_DETECTION_DELAY
ELAPSED_TIME=0
RESOLVCONF_FLAGFILE=/var/run/resolvconf/enable-updates
RESOLVCONF_DIR=/var/run/resolvconf/interface

# source network configuration
. /etc/sysconfig/network

# Check that networking is up.
[ "${NETWORKING}" = "no" ] && exit 0
cd /etc/sysconfig/network-scripts

. network-functions

# find all the interfaces besides loopback.
# ignore aliases, alternative configurations, and editor backup files
interfaces=$(ls ifcfg* | \
        LANG=C sed -e "$__sed_discard_ignored_files" \
               -e '/\(ifcfg-lo\|:\|ifcfg-.*-range\)/d' \
               -e '/ifcfg-[A-Za-z0-9\._-]\+$/ { s/^ifcfg-//g;s/[0-9]/ &/}' | \
        LANG=C sort -k 1,1 -k 2n | \
        LANG=C sed 's/ //')

function may_have_link() {
    local DEVICE=$1
    local LINKDELAY=0
    ! check_link_down ${DEVICE} || is_associating ${DEVICE}
}

function is_associating() {
    local DEVICE=$1
    is_wireless_device ${DEVICE} || return 1
    local AP=`iwgetid -a -r ${DEVICE} 2>/dev/null`
    [ -n "$AP" ] && [ "$AP" != "00:00:00:00:00:00" ] && [ "$AP" != "44:44:44:44:44:44" ] && [ "$AP" != "FF:FF:FF:FF:FF:FF" ]
}

function should_wait_network() {
    for i in $interfaces; do
        unset DEVICE TYPE BOOTPROTO MII_NOT_SUPPORTED PEERDNS DNS1 DNS2
        LINK_DETECTION_DELAY=$DEFAULT_LINK_DETECTION_DELAY
        eval $(LANG=C fgrep "DEVICE=" ifcfg-$i)
        eval $(LANG=C fgrep "TYPE=" ifcfg-$i)
        eval $(LANG=C fgrep "BOOTPROTO=" ifcfg-$i)
        eval $(LANG=C fgrep "MII_NOT_SUPPORTED=" ifcfg-$i)
        eval $(LANG=C fgrep "LINK_DETECTION_DELAY=" ifcfg-$i)
        eval $(LANG=C fgrep "PEERDNS=" ifcfg-$i)
        eval $(LANG=C fgrep "DNS1=" ifcfg-$i)
        eval $(LANG=C fgrep "DNS2=" ifcfg-$i)
        if [ $LINK_DETECTION_DELAY -lt $MIN_LINK_DETECTION_DELAY ]; then
            LINK_DETECTION_DELAY=$MIN_LINK_DETECTION_DELAY
        fi

        if [ -z "$DEVICE" ] ; then DEVICE="$i"; fi
        if [ "$BOOTPROTO" != "static" ] \
            && [ "$BOOTPROTO" != "dhcp" ] \
            && [ "$BOOTPROTO" != "bootp" ]; then
            continue
        fi

        # only check interfaces using ifplug, other interfaces are
        # started synchronously from the network service
        if [ "$MII_NOT_SUPPORTED" = "yes" ]; then
            continue
        fi

        # only check interfaces automatically launched
        if LANG=C egrep -q "^ONBOOT=['\"]?[Nn][Oo]['\"]?" ifcfg-$i; then
            continue
        fi

        # ignore devices that are not present
        ip -o link show ${DEVICE} &>/dev/null || continue

        # check link beat
        if ! may_have_link ${DEVICE}; then
            # before configured delay, consider a lack of link beat
            # as not ready, and unplugged thereafter
            if [ $ELAPSED_TIME -lt $LINK_DETECTION_DELAY ]; then
                return 0
            fi
            # no need to wait for unplugged devices to come up
            continue
        fi

        # check address is set
        ADDR=`ip addr show scope global ${DEVICE} | awk '/inet/ {print $2;}'`
        if [ -z "$ADDR" ]; then
            return 0
        fi

        # wait for changes to be propagated by resolvconf if needed
        if [ -e $RESOLVCONF_FLAGFILE ]; then
            if [ "$BOOTPROTO" = "dhcp" -a "$PEERDNS" != "no" ] \
                || [ -n "$DNS1" -o -n "$DNS2" ]; then
                if [ ! -e $RESOLVCONF_DIR/$DEVICE ]; then
                    return 0
                fi
                if [ $RESOLVCONF_DIR/$DEVICE -nt /etc/resolv.conf ]; then
                    return 0
                fi
            fi
        fi
    done
    # all interfaces are ready
    return 1
}

case "$1" in
  start)
    gprintf "Waiting for network to be up"

    for i in $interfaces; do
        LINK_DETECTION_DELAY=$DEFAULT_LINK_DETECTION_DELAY
        eval $(LANG=C fgrep "LINK_DETECTION_DELAY=" ifcfg-$i)
        if [ "$LINK_DETECTION_DELAY" -gt $MAX_LINK_DETECTION_DELAY ]; then
            MAX_LINK_DETECTION_DELAY=$LINK_DETECTION_DELAY
        fi
    done
    NETWORKDELAY=$(( NETWORKDELAY + MAX_LINK_DETECTION_DELAY ))

    while should_wait_network && [ $ELAPSED_TIME -lt $NETWORKDELAY ]; do
        sleep 1
        let ELAPSED_TIME=$ELAPSED_TIME+1
    done
    [ $ELAPSED_TIME -ge $NETWORKDELAY ] && failure || success
    echo
    ;;
  stop)
      ;;
  *)
        gprintf "Usage: %s\n" "$(basename $0) {start|stop}"
        exit 1
esac

exit 0