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#!/bin/sh -x

##########################################################

# Copyright (C) 2001-2018 VMware, Inc. All rights reserved.

#

# This program is free software; you can redistribute it and/or modify it

# under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation version 2.1 and no 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 Lesser GNU General Public

# License for more details.

#

# You should have received a copy of the GNU Lesser General Public License

# along with this program; if not, write to the Free Software Foundation, Inc.,

# 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA.

#

##########################################################

#

# network (Linux)

#

# Using a combination of a system networking script, ifconfig, ifup, ifdown

# and the ip command, attempt to release and renew DHCP leases upon receipt

# of suspend and resume events, respectively.

#

logbase=/var/log/vmware-network

logfile=$logbase.log

#

# Rotate any logs

#

rotate_logfile() {

    max=9

    max=`expr $max - 1`

    for s in `seq $max -1 1`; do

        d=`expr $s + 1`

        mv -f $logbase.$s.log $logbase.$d.log

    done

    mv -f $logbase.log $logbase.1.log

}

rotate_logfile

# redirect stdio

exec > $logfile 2>&1

chmod 0600 $logfile

echo `date` ": Executing '$0 $*'"

echo

. `dirname "$0"`/../../statechange.subr

#

# find_networking_script --

#

#    Searches common Linux distro init/rc paths to find a singular network

#    services script.

#

# Result:

#    Returns a valid networking script path on success or "error" on failure.

#

# Side effects:

#    None.

#

find_networking_script() {

   local script="error"

   for dir in "/etc/init.d" "/sbin/init.d" "/etc" "/etc/rc.d" ; do

      if [ -d "$dir/rc0.d" ] &&

         [ -d "$dir/rc1.d" ] &&

         [ -d "$dir/rc2.d" ] &&

         [ -d "$dir/rc3.d" ] &&

         [ -d "$dir/rc4.d" ] &&

         [ -d "$dir/rc5.d" ] &&

         [ -d "$dir/rc6.d" ]; then

         # Now find the appropriate networking script.

         if [ -d "$dir/init.d" ]; then

            if [ -x "$dir/init.d/network" ]; then

               script="$dir/init.d/network"

            elif [ -x "$dir/init.d/networking" ]; then

               script="$dir/init.d/networking"

            fi

         else

            if [ -x "$dir/network" ]; then

               script="$dir/network"

            elif [ -x "$dir/networking" ]; then

               script="$dir/networking"

            fi

         fi

      fi

   done

   echo "$script"

}

#

# exec_networking_script --

#

#    Execute the networking script to bring network interfaces up or down

#    based on the given input action argument.

#

exec_networking_script()

{

   local script=$1

   local action=$2

   # Using SysV "service" if it exists, otherwise fall back to run the

   # script directly

   service=`which service 2>/dev/null`

   if [ $? = 0 -a -n "$service" ]; then

      serviceName=`basename "$script"`

      "$service" "$serviceName" "$action"

   else

      "$script" "$action"

   fi

   return $?

}

#

# exec_systemctl_service --

#

#    Handle linux distributions that use systemd to replace the legacy

#    system V startup scripts. The previous network script searching

#    approach is no longer viable in these systems. Invoke the systemctl

#    command to control the network service instead.

#

exec_systemctl_service()

{

   local rc=1

   local action=$1

   local ctlcmd=$(which systemctl 2>/dev/null)

   local service

   [ -z "$ctlcmd" ] && return $rc

   for svc in systemd-networkd network; do

      if ! $ctlcmd status $svc | grep -iq 'not-found'; then

         service=$svc && break

      fi

   done

   [ -z "$service" ] && return $rc

   $ctlcmd $action $service; rc=$?

   # When use the systemd-networkd service to shut down interfaces, interface

   # address and state remain unchanged. Need to use ip command to change its

   # address and state.

   if [ $rc = 0 -a $service = 'systemd-networkd' -a $action = 'stop' ]; then

      config_network_intfs $action; rc=$?

   fi

   return $rc

}

#

# del_intf_ip --

#

#    Use the ip command to remove all the addresses of an interface.

#

del_intf_ip()

{

   local nic=$1

   $ip_cmd addr flush dev $nic

   return $?

}

#

# ip_intf_ops --

#

#    Use the ip command to change the state of an interface to up or down.

#

ip_intf_ops()

{

   local rc=1

   local nic=$1

   local ops=$2

   [ -z "$ip_cmd" ] && return $rc

   $ip_cmd link set $nic $ops; rc=$?

   # Remove interface addresses when taking an interface down.

   if [ $rc = 0 -a $ops = down ]; then

      del_intf_ip $nic; rc=$?

   fi

   return $rc

}

#

# intf_ops --

#

#    Execute the specified command (ifup or ifdown) if available, otherwise use

#    the ip command as fallback. If ifup or ifdown fails, run the ip command to

#    retry the intended operation.

#

intf_ops()

{

   local rc=0

   local cmd=$1

   local ops=$2

   local nic=$3

   local tmp

   if [ ! -z "$cmd" ]; then

      tmp=$($cmd $nic 2>&1); rc=$?

      # Some systems still return a successful status even the command fails

      # because the interface is not configured in the configuration file. So

      # have to examine the command output to determine the actual status.

      if [ $rc = 0 ]; then

         echo $tmp | egrep -iq 'not configured|ignoring unknown' && rc=1

      fi

   fi

   # If ifup/ifdown fails, try the ip fallback.

   if [ -z "$cmd" -o $rc != 0 ]; then

      ip_intf_ops $nic $ops; rc=$?

   fi

   return $rc

}

#

# exec_intf_ops --

#

#    Perform an operation to bring an individual interface up or down.

#

exec_intf_ops()

{

   local rc=0

   local action=$1

   local nic=$2

   case $action in

      start)

         intf_ops "$ifup_cmd" up $nic; rc=$?

         ;;

      stop)

         intf_ops "$ifdown_cmd" down $nic; rc=$?

         ;;

      *)

         Panic "Illegal interface action: $action"

         ;;

   esac

   return $rc

}

#

# config_network_intfs --

#

#    For Linux systems not supporting networking scripts to bring interfaces

#    up or down, provide a way to change the interface state individually.

#

config_network_intfs()

{

   local rc=0

   local action=$1

   if [ -f "$activeList" ]; then

      while read nic; do

         exec_intf_ops $action $nic

         rc=$(expr $rc \| $?)

      done < $activeList

   fi

   return $rc

}

#

# run_network_script --

#

#    Finds out how to run the system's script used to control networking, and

#    runs it with the given argument (which should be one of the usual SysV

#    init script arguments). If it does not work, tries the other alternatives.

#    So far, our alternatives are (a) systemctl (b) network script (c) perform

#    an individual interface state change.

#

run_network_script()

{

   local action=$1

   local rc=0

   local script

   while true; do

      exec_systemctl_service $action

      [ $? != 0 ] || break

      script=`find_networking_script`

      if [ $script != "error" ]; then

         exec_networking_script $script $action

         [ $? != 0 ] || break

      fi

      # Since all the other alternatives fail, need to manually change

      # individual interface state.

      config_network_intfs $action; rc=$?

      break

   done

   return $rc

}

#

# save_active_NIC_list --

#

#    Records a list of every active NIC to /var/run/vmware-active-nics.

#

#    XXX What's the story on aliases?  Should they still be included, or will

#    they be recreated automatically upon resume?

#

# Results:

#    $activeList has, one per line, a list of all active NICs.

#

# Side effects:

#    None.

#

save_active_NIC_list()

{

   local intf_out

   >$activeList

   # Find out all the non-loopback up interfaces. Use ip if available

   # otherwise fall back to the ifconfig command.

   # ifconfig is buggy on some platforms and truncates long

   # network names

   if [ -n "$ip_cmd" ]; then

      for nic in $($ip_cmd link show up | egrep '\bUP\b' | awk -F: '{print $2}'); do

         $ip_cmd link show ${nic%@*} | grep -iq 'link/ether' && echo ${nic%@*} >> $activeList

      done

   else

      for nic in $($ifconfig_cmd | sed -n 's/^\([^: \t]*\).*$/\1/p'); do

         intf_out=$($ifconfig_cmd $nic)

         echo $intf_out | grep -iq loopback && continue

         echo $intf_out | egrep -q '\bUP\b' && echo $nic >> $activeList

      done

   fi

}

#

# rescue_NIC --

#

#    For each NIC recorded in $activeList that is not currently "up", run

#    "ifup $nic" or "ip link set $nic up" to bring the interface up.

#

# Results:

#    All downed NICs should be active.

#

rescue_NIC()

{

   local rc=0

   local intf_out

   if [ -f "$activeList" ]; then

      while read nic; do

         if [ -n "$ip_cmd" ]; then

            intf_out=$($ip_cmd link show $nic up)

         else

            intf_out=$($ifconfig_cmd $nic)

         fi

         if echo $intf_out | grep -q 'UP'; then

            echo `date` "[rescue_nic] $nic is already active."

         else

            echo `date` "[rescue_nic] activating $nic ..."

            # Our best effort to activate interfaces, use ifup if available

            # otherwise use the ip command as fallback.

            intf_ops "$ifup_cmd" up $nic

            rc=$(expr $rc \| $?)

         fi

      done < $activeList

      rm -f $activeList

   fi

   return $rc

}

#

# TranquilizeNetworkManager --

#

#    Put the NetworkManager daemon to sleep (maybe).

#

#    See http://projects.gnome.org/NetworkManager/developers/spec.html .

#

# Results:

#    Sleep(true) request is sent to the NetworkManager D-Bus interface.

#

# Side effects:

#    None.

#

TranquilizeNetworkManager()

{

   # `which' may be a bit noisy, so we'll shush it.

   dbusSend=`which dbus-send 2>/dev/null`

   rc=$?

   if [ $rc -ne 0 ]; then

      return $rc

   fi

   # Check NetworkManager state before disabling it.

   nm_state=`$dbusSend --system --print-reply		\

             --dest=org.freedesktop.NetworkManager	\

             /org/freedesktop/NetworkManager		\

             org.freedesktop.DBus.Properties.Get	\

             string:'org.freedesktop.NetworkManager'	\

             string:'State'				\

             | awk '/variant/ {print $3;}'`

   if [ -z "$nm_state" ]; then

      return 1

   fi

   # NetworkManager API     0.7/0.8   0.9

   # NM_STATE_ASLEEP           1      10

   # NM_STATE_DISCONNECTED     4      20

   case $nm_state in

      1|4|10|20)

         # Nothing needs to be done.

         return 0

         ;;

   esac

   # NetworkManager 0.8.0 and above

   $dbusSend --system --print-reply          \

      --dest=org.freedesktop.NetworkManager  \

      /org/freedesktop/NetworkManager        \

      org.freedesktop.NetworkManager.Enable boolean:false

   rc=$?

   if [ $rc -eq 0 ]; then

      return $rc

   fi

   # NetworkManager 0.7.0

   $dbusSend --system --print-reply          \

      --dest=org.freedesktop.NetworkManager  \

      /org/freedesktop/NetworkManager        \

      org.freedesktop.NetworkManager.Sleep boolean:true

   rc=$?

   if [ $rc -eq 0 ]; then

      return $rc

   fi

   # NetworkManager 0.6

   $dbusSend --system --print-reply          \

      --dest=org.freedesktop.NetworkManager  \

      /org/freedesktop/NetworkManager        \

      org.freedesktop.NetworkManager.sleep

   rc=$?

   return $rc

}

#

# WakeNetworkManager --

#

#    Wake the NetworkManager daemon (maybe).

#

#    See http://projects.gnome.org/NetworkManager/developers/spec.html .

#

# Results:

#    Sleep(false)request is sent to the NetworkManager D-Bus interface.

#

# Side effects:

#    None.

#

WakeNetworkManager()

{

   # `which' may be a bit noisy, so we'll shush it.

   dbusSend=`which dbus-send 2>/dev/null`

   rc=$?

   if [ $rc = 0 ]; then

      # NetworkManager 0.8.0

      $dbusSend --system --print-reply          \

         --dest=org.freedesktop.NetworkManager  \

         /org/freedesktop/NetworkManager        \

         org.freedesktop.NetworkManager.Enable boolean:true

      rc=$?

      if [ $rc = 0 ]; then

         return $rc

      fi

      # NetworkManager 0.7.0

      $dbusSend --system --print-reply          \

         --dest=org.freedesktop.NetworkManager  \

         /org/freedesktop/NetworkManager        \

         org.freedesktop.NetworkManager.Sleep boolean:false

      rc=$?

      if [ $rc = 0 ]; then

         return $rc

      fi

      # NetworkManager 0.6

      $dbusSend --system --print-reply          \

         --dest=org.freedesktop.NetworkManager  \

         /org/freedesktop/NetworkManager        \

         org.freedesktop.NetworkManager.wake

      rc=$?

   fi

   return $rc

}

#

# sanity_check --

#

#    Check if the script has all the commands it needs to carry out the

#    request. So far, it requires either ip or ifconfig command to read

#    interface configuration. Ifup is not checked here. It is checked at

#    the place where we need to do individual interface state change.

#

sanity_check()

{

   ip_cmd=$(which ip 2>/dev/null)

   ifconfig_cmd=$(which ifconfig 2>/dev/null)

   ifup_cmd=$(which ifup 2>/dev/null)

   ifdown_cmd=$(which ifdown 2>/dev/null)

   [ -z "$ifconfig_cmd" -a -z "$ip_cmd" ] && \

       Panic "ip and ifconfig not in search path."

}

#

# main --

#

#    Main entry point.  Perform some sanity checking, then map state change

#    events to relevant networking operations.

#

# Results:

#    See comment at top of file.

#

main() {

   exitCode=0

   activeList=/var/run/vmware-active-nics

   case "$1" in

      poweron-vm)

         rm -f $activeList

         ;;

      suspend-vm)

         TranquilizeNetworkManager

         exitCode=$?

         if [ $exitCode != 0 ]; then

            sanity_check suspend-vm

            save_active_NIC_list

            run_network_script stop

            exitCode=$?

         fi

         ;;

      resume-vm)

         WakeNetworkManager

         exitCode=$?

         if [ $exitCode != 0 ]; then

            sanity_check resume-vm

            # According to hfu, "/etc/init.d/networking restart" on Debian 5.0

            # may bring down ethernet interfaces tagged as "allow-hotplug" without

            # bringing them back up.

            #

            # This is especially a problem when reverting to a live, running

            # VM snapshot where an active NIC list hadn't yet been generated,

            # resulting in sudden loss of an otherwise operational NIC.

            #

            # So, if the active list doesn't exist, assume we're coming back to

            # a live snapshot and capture the current active list now for

            # rescue later.

            if [ ! -s $activeList ]; then

               save_active_NIC_list

            fi

            # We shall use start not restart here. Otherwise we may not be able

            # to bring back active list on distros like sles11sp2

            # -- PR 816791

            run_network_script start

            rescue_NIC

            exitCode=$?

         fi

         ;;

      *)

         echo "No argument supplied."

         ;;

   esac

   return $exitCode

}

main "$@"

echo `date` ": Finished '$0 $*'"