slackware-current/source/n/network-scripts/scripts/rc.inet1

#! /bin/sh
# /etc/rc.d/rc.inet1
# This script is used to bring up the various network interfaces.
#
# @(#)/etc/rc.d/rc.inet1 10.2  Sun Jul 24 12:45:56 PDT 2005  (pjv)

############################
# READ NETWORK CONFIG FILE #
############################

# Get the configuration information from /etc/rc.d/rc.inet1.conf:
. /etc/rc.d/rc.inet1.conf

###########
# LOGGING #
###########

# If possible, log events in /var/log/messages:
if [ -f /var/run/syslogd.pid -a -x /usr/bin/logger ]; then
  LOGGER=/usr/bin/logger
else # output to stdout/stderr:
  LOGGER=/bin/cat
fi

############################
# DETERMINE INTERFACE LIST #
############################

# Compose a list of interfaces from /etc/rc.d/rc.inet1.conf (with a maximum
# of 6 interfaces, but you can easily enlarge the interface limit
# - send me a picture of such a box :-).
# If a value for IFNAME[n] is not set, we assume it is an eth'n' interface.
# This way, the new script is compatible with older rc.inet1.conf files.
# The IFNAME array will be used to determine which interfaces to bring up/down.
MAXNICS=${MAXNICS:-6}
i=0
while [ $i -lt $MAXNICS ];
do
  IFNAME[$i]=${IFNAME[$i]:=eth${i}}
  i=$(($i+1))
done
if [ "$DEBUG_ETH_UP" = "yes" ]; then
  echo "/etc/rc.d/rc.inet1:  List of interfaces: '${IFNAME[@]}'" | $LOGGER
fi

######################
# LOOPBACK FUNCTIONS #
######################

# Function to bring up the loopback interface.  If loopback is
# already up, do nothing.
lo_up() {
  if grep lo: /proc/net/dev 1> /dev/null ; then
    if ! /sbin/ifconfig | grep "^lo" 1> /dev/null ; then
      echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig lo 127.0.0.1" | $LOGGER
      /sbin/ifconfig lo 127.0.0.1
      echo "/etc/rc.d/rc.inet1:  /sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo" | $LOGGER
      /sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo
    fi
  fi
}

# Function to take down the loopback interface:
lo_down() {
  if grep lo: /proc/net/dev 1> /dev/null ; then
    echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig lo down" | $LOGGER
    /sbin/ifconfig lo down
  fi
}

#######################
# INTERFACE FUNCTIONS #
#######################

# Function to assemble a bridge interface.
br_open() {
  # argument is 'i' - the position of this interface in the IFNAME array.
  /sbin/brctl addbr ${IFNAME[$1]}
  for BRIF in $(echo ${BRNICS[$1]}); do
    /sbin/ifconfig $BRIF down
    /sbin/ifconfig $BRIF 0.0.0.0 promisc up
    /sbin/brctl addif ${IFNAME[$1]} $BRIF
  done
}

# Function to disassemble a bridge interface.
br_close() {
  # argument is 'i' - the position of this interface in the IFNAME array.
  #for BRIF in $(echo ${BRNICS[$1]}); do
  for BRIF in $(ls --indicator-style=none /sys/class/net/${IFNAME[$1]}/brif/)
  do
    /sbin/brctl delif ${IFNAME[$1]} $BRIF
  done
  /sbin/ifconfig ${IFNAME[$1]} down
  /sbin/brctl delbr ${IFNAME[$1]}
}

# Function to bring up a network interface.  If the interface is
# already up or does not yet exist (perhaps because the kernel driver
# is not loaded yet), do nothing.
if_up() {
  # Determine position 'i' of this interface in the IFNAME array:
  i=0
  while [ $i -lt $MAXNICS ]; do
    [ "${IFNAME[$i]}" = "${1}" ] && break
    i=$(($i+1))
  done
  # If the interface is a bridge, then create it first:
  [ -n "${BRNICS[$i]}" ] && br_open $i
  # If the interface isn't in the kernel yet (but there's an alias for it in
  # modules.conf), then it should be loaded first:
  if ! grep `echo ${1}: | cut -f 1 -d :`: /proc/net/dev 1> /dev/null ; then # no interface yet
    if /sbin/modprobe -c | grep -v "^#" | grep -w "alias ${1}" | grep -vw "alias ${1} off" > /dev/null ; then
      echo "/etc/rc.d/rc.inet1:  /sbin/modprobe ${1}" | $LOGGER
      /sbin/modprobe ${1}
    fi
  fi
  if grep `echo ${1}: | cut -f 1 -d :`: /proc/net/dev 1> /dev/null ; then # interface exists
    if ! /sbin/ifconfig | grep -w "${1}" 1>/dev/null || \
      ! /sbin/ifconfig ${1} | grep -w inet 1> /dev/null ; then # interface not up or not configured
      if [ ! "${HWADDR[$i]}" = "" ]; then # Set hardware address _before_ the interface goes up:
        echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} hw ether ${HWADDR[$i]}" | $LOGGER
        /sbin/ifconfig ${1} hw ether ${HWADDR[$i]}
      fi
      if [ ! "${MTU[$i]}" = "" ]; then # Set MTU to something else than 1500
        echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} mtu ${MTU[$i]}" | $LOGGER
        /sbin/ifconfig ${1} mtu ${MTU[$i]}
      fi
      if [ -x /etc/rc.d/rc.wireless ]; then
        . /etc/rc.d/rc.wireless ${1} start # Initialize any wireless parameters
      fi
      if [ "${USE_DHCP[$i]}" = "yes" ]; then # use DHCP to bring interface up
        # Clear DHCP_OPTIONS before adding new options to it:
        unset DHCP_OPTIONS
        # Set DHCP_OPTIONS for this interface:
        [ ${DHCP_HOSTNAME[$i]} ] && DHCP_OPTIONS="-h ${DHCP_HOSTNAME[$i]}"
        [ "${DHCP_KEEPRESOLV[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -C resolv.conf"
        [ "${DHCP_KEEPNTP[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -C ntp.conf"
        [ "${DHCP_KEEPGW[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -G"
        [ "${DHCP_DEBUG[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -d"
        [ "${DHCP_NOIPV4LL[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -L"
        [ ${DHCP_IPADDR[$i]} ] && DHCP_OPTIONS="$DHCP_OPTIONS -r ${DHCP_IPADDR[$i]}"
        echo "Polling for DHCP server on interface ${1}:"
        # If you set a timeout, you get one, even if the kernel doesn't think that
        # your device is connected, in case /sys isn't right (which it usually isn't
        # except right after the device is loaded, when it usually is):
        #### (start commented out)
        # This is deactivated for now since the kernel has been returning incorrect
        # results concerning whether the interface carrier is detected.
        #if [ "${DHCP_TIMEOUT[$i]}" = "" ]; then
        #  ifconfig ${1} up && sleep 1
        #  CONNSTATUS="$(cat /sys/class/net/${1}/carrier 2> /dev/null)"
        #  ifconfig ${1} down
        #  if [ "$CONNSTATUS" = "0" ]; then
        #    # The kernel has just told us the cable isn't even plugged in, but we will
        #    # give any DHCP server a short chance to reply anyway:
        #    echo "No carrier detected on ${1}.  Reducing DHCP timeout to 10 seconds."
        #    DHCP_TIMEOUT[$i]=10
        #  fi
        #fi
        #### (end commented out)
        # 10 seconds should be a reasonable default DHCP timeout.  30 was too much.
        echo "/etc/rc.d/rc.inet1:  /sbin/dhcpcd -t ${DHCP_TIMEOUT[$i]:-10} ${DHCP_OPTIONS} ${1}" | $LOGGER
        /sbin/dhcpcd -t ${DHCP_TIMEOUT[$i]:-10} ${DHCP_OPTIONS} ${1}
      else # bring up interface using a static IP address
        if [ ! "${IPADDR[$i]}" = "" ]; then # skip unconfigured interfaces
          # Determine broadcast address from the IP address and netmask:
          BROADCAST[$i]=`/bin/ipmask ${NETMASK[$i]} ${IPADDR[$i]}|cut -f1 -d' '`
          # Set up the network card:
          echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} ${IPADDR[$i]} broadcast ${BROADCAST[$i]} netmask ${NETMASK[$i]}" | $LOGGER
          /sbin/ifconfig ${1} ${IPADDR[$i]} broadcast ${BROADCAST[$i]} netmask ${NETMASK[$i]}
        else
          if [ "$DEBUG_ETH_UP" = "yes" ]; then
            echo "/etc/rc.d/rc.inet1:  ${1} interface is not configured in /etc/rc.d/rc.inet1.conf" | $LOGGER
          fi
        fi
      fi
    else
      if [ "$DEBUG_ETH_UP" = "yes" ]; then
        echo "/etc/rc.d/rc.inet1:  ${1} is already up, skipping" | $LOGGER
      fi
    fi 
  else
    if [ "$DEBUG_ETH_UP" = "yes" ]; then
      echo "/etc/rc.d/rc.inet1:  ${1} interface does not exist (yet)" | $LOGGER
    fi
  fi
}

# Function to take down a network interface:
if_down() {
  # Determine position 'i' of this interface in the IFNAME array:
  i=0
  while [ $i -lt $MAXNICS ]; do
    [ "${IFNAME[$i]}" = "${1}" ] && break
    i=$(($i+1))
  done
  if grep `echo ${1}: | cut -f 1 -d :`: /proc/net/dev 1> /dev/null ; then
    if [ "${USE_DHCP[$i]}" = "yes" ]; then
      echo "/etc/rc.d/rc.inet1:  /sbin/dhcpcd -k -d ${1}" | $LOGGER
      /sbin/dhcpcd -k -d ${1} 2> /dev/null || /sbin/ifconfig ${1} down
      sleep 1
    else
      echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} down" | $LOGGER
      /sbin/ifconfig ${1} down
    fi
    if [ -x /etc/rc.d/rc.wireless ]; then
      . /etc/rc.d/rc.wireless ${1} stop # Kill wireless daemons if any.
    fi
    # If the interface is a bridge, then destroy it now:
    [ -n "${BRNICS[$i]}" ] && br_close $i
  fi
}

#####################
# GATEWAY FUNCTIONS #
#####################

# Function to bring up the gateway if there is not yet a default route:
gateway_up() {
  if ! /sbin/route -n | grep "^0.0.0.0" 1> /dev/null ; then
    if [ ! "$GATEWAY" = "" ]; then
      echo "/etc/rc.d/rc.inet1:  /sbin/route add default gw ${GATEWAY} metric 1" | $LOGGER
      /sbin/route add default gw ${GATEWAY} metric 1 2>&1 | $LOGGER
    fi
  fi
}

# Function to take down an existing default gateway:
gateway_down() {
  if /sbin/route -n | grep "^0.0.0.0" 1> /dev/null ; then
    echo "/etc/rc.d/rc.inet1:  /sbin/route del default" | $LOGGER
    /sbin/route del default
  fi
}

# Function to start the network:
start() {
  lo_up
  for i in ${IFNAME[@]} ; do
    if_up $i
  done
  gateway_up
}

# Function to stop the network:
stop() {
  gateway_down
  for i in ${IFNAME[@]} ; do
    if_down $i
  done
  lo_down
}


############
### MAIN ###
############

case "$1" in
'start') # "start" brings up all configured interfaces:
  start
  ;;
'stop') # "stop" takes down all configured interfaces:
  stop
  ;;
'restart') # "restart" restarts the network:
  stop
  start
  ;;
*_start) # Example: "eth1_start" will start the specified interface 'eth1'
  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`
  if_up $INTERFACE
  gateway_up
  ;;
*_stop) # Example: "eth0_stop" will stop the specified interface 'eth0'
  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`
  if_down $INTERFACE
  ;;
*_restart) # Example: "wlan0_restart" will take 'wlan0' down and up again
  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`
  if_down $INTERFACE
  sleep 1
  if_up $INTERFACE
  gateway_up
  ;;
'up') # "up" does the same thing as "start"
  start
  ;;
'down') # "down" does the same thing as "stop"
  stop
  ;;
*_up) # "*_up" does the same thing as "*_start"
  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`
  if_up $INTERFACE
  gateway_up
  ;;
*_down) # "*_down" does the same thing as "*_stop"
  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`
  if_down $INTERFACE
  ;;
*) # The default is to bring up all configured interfaces:
  start
esac

# End of /etc/rc.d/rc.inet1