Subversion Repositories configs

#!/bin/bash

#

# configures aliases of device $1

#

# This script goes out of its way to arrive at the configuration of ip

# aliases described in the ifcfg-$DEV:* and ifcfg-$DEV-range* files from

# whatever existing configuration it may be given: existing aliases not

# specified in the configuration will be removed, netmasks and broadcast

# addrs will be updated on existing aliases, and new aliases will be setup.

#

#   range specification files:

#

# One can specify ranges of alised ipaddress using ifcfg-$DEV-range* files.

# Specify multiple ranges using multiple files, such as ifcfg-eth0-range0 and

# ifcfg-eth0-range1, etc. In these files, the following configuration variables

# specify the range:

#

#    IPADDR_START    -- ipaddr to start range at. eg "192.168.30.1"

#    IPADDR_END      -- ipaddr to end range at. eg "192.168.30.254"

#    CLONENUM_START  -- interface clone number to start using for this range. eg "0"

#

# The above example values create the interfaces eth0:0 through eth0:253 using

# ipaddrs 192.168.30.1 through 192.168.30.254, inclusive.

#

# Other configuration variables such as NETMASK and BROADCAST may be specified

# in the range file and will apply to all of the ipaddresses in the range. Range

# files also inherit configuration from the ifcfg-$DEV file just like normal.

#

# Note that IPADDR_START and IPADR_END are required to be in the same class-c

# block. I.e. IPADDR_START=192.168.30.1 and IPADDR_END=192.168.31.255 is

# not valid.

#

#   speed with large sets of interfaces:

#

# Considerable effort was spent making this script fast. It can efficiently

# handle a thousand ip aliases on one interface.

#

# With large sets of ipaddresses the NO_ALIASROUTING=yes configuration is

# highly recommended. (This can be specified in ifcfg-$DEV and inherited.) This

# prevents this script from setting up routing details for the virtual

# interfaces, which I don't think is needed, because outgoing traffic can use the

# main interface. However, make your own conclusions on what you need.

#

# My test setup of four class C address blocks on a P166 took 25 seconds of

# which 16 seconds of this was spent in the ifcconfig calls. Without the

# NO_ALIASROUTING=yes config an additional 12 seconds is spent in route calls.

#

#   notes on internals:

#

# This script uses the bash "eval" command to lookup shell variables with names

# which are generated from other shell variables. This allows us to, in effect,

# create hashes using the shell variable namesspace by just including the hash

# key in the name of the variable.

#

# This script originally written by: David Harris <dharris@drh.net>

#                                    Principal Engineer, DRH Internet

#                                    June 30, 1999

#

#            modified by: Bill Nottingham <notting@redhat.com>

TEXTDOMAIN=initscripts

TEXTDOMAINDIR=/etc/locale

device=$1

if [ "$device" = "" ]; then

	echo $"usage: ifup-aliases <net-device> [<parent-config>]\n"

	exit 1

fi

PARENTCONFIG=${2:-ifcfg-$device}

parent_device=$device

cd /etc/sysconfig/network-scripts

. ./network-functions

# Grab the current configuration of any running aliases, place device info

# into variables of the form:

# rdev_<index>_addr = <ip address>

# rdev_<index>_pb = <prefix>_<broadcast>

# rdevip_<ipaddress> = <index>

# Example:

# rdev_0_addr=192.168.1.1

# rdev_0_pb=24_192.16.1.255

# rdevip_192_168_1_1=0

#

# A list of all the devices is created in rdev_LIST.

eval $( ip addr show $device label $device:* | \

	awk 'BEGIN { COUNT=0;LAST_DEV="" } /inet / {

# Split IP address into address/prefix

                split($2,IPADDR,"/");

# Create A_B_C_D IP address form

                IP_ADDR=IPADDR[1];

                gsub(/\./,"_",IP_ADDR);

# Split device into device:index

                split($NF,DEV,":");

# Update last device

                LAST_DEV=LAST_DEV " " DEV[2];

                printf("rdev_%s_addr=%s\nrdevip_%s=%s\nrdev_%s_pb=%s_%s\nrdev_LIST=\"%s\"\n",

	             DEV[2],IPADDR[1],IP_ADDR,DEV[2],DEV[2],IPADDR[2],$4,LAST_DEV);

	     } END {

	        if(LAST_DEV == "") print "no_devices_are_up=yes"

	     }' );

       #

       # Store configuration of the parent device and network

       #

# read from the /etc/sysconfig/network

eval ` (

       . /etc/sysconfig/network;

       echo network_GATEWAY=$GATEWAY\;;

       echo network_GATEWAYDEV=$GATEWAYDEV\;;

) `

# read defaults from the parent config file

[ -f $PARENTCONFIG ] || {

       net_log $"Missing config file $PARENTCONFIG."

       exit 1

}

eval ` (

       . ./$PARENTCONFIG;

       echo default_PREFIX=$PREFIX\;;

       echo default_NETMASK=$NETMASK\;;

       echo default_BROADCAST=$BROADCAST\;;

       echo default_GATEWAY=$GATEWAY\;;

       echo default_NO_ALIASROUTING=$NO_ALIASROUTING\;;

       echo default_ARPCHECK=$ARPCHECK\;;

       echo default_ARPUPDATE=$ARPUPDATE\;;

) `

[ -z "$default_GATEWAY" ] && default_GATEWAY=$network_GATEWAY

function ini_env ()

{

       DEVICE=""

       IPADDR=""

       PREFIX=$default_PREFIX

       NETMASK=$default_NETMASK

       BROADCAST=$default_BROADCAST

       GATEWAY=$default_GATEWAY

       NO_ALIASROUTING=$default_NO_ALIASROUTING

       ONPARENT=""

       ARPCHECK=$default_ARPCHECK

       ARPUPDATE=$default_ARPUPDATE

}

function is_default_gateway ()

{

	LC_ALL=C /sbin/route -n \

		| awk '$1 == "0.0.0.0" && $2 == "'"$1"'" { found = 1; }

		       END { exit found == 0; }'

}

       #

       # Read the alias configuration files and enable each aliased

       # device using new_interface()

       #

function new_interface ()

{

       ipa=$IPADDR; ipb=${ipa#*.}; ipc=${ipb#*.};

       IPGLOP="${ipa%%.*}_${ipb%%.*}_${ipc%%.*}_${ipc#*.}";

       DEVNUM=${DEVICE#*:}

       MATCH='^[0-9A-Za-z_]*$'

       if (LC_ALL=C; [[ ! "$DEVNUM" =~ $MATCH ]]); then

	      net_log $"error in $FILE: invalid alias number"

	      return 1

       fi

       eval "

              ipseen=\$ipseen_${IPGLOP}; devseen=\$devseen_${DEVNUM};

              ipseen_${IPGLOP}=$FILE; devseen_${DEVNUM}=$FILE;

       ";

       if [ -n "$ipseen" ]; then

              net_log $"error in $FILE: already seen ipaddr $IPADDR in $ipseen"

	      return 1

       fi

       if [ -n "$devseen" ]; then

              net_log $"error in $FILE: already seen device $parent_device:$DEVNUM in $devseen"

	      return 1

       fi

       if [ -z "$DEVICE" -o -z "$IPADDR" ]; then

              net_log $"error in $FILE: didn't specify device or ipaddr"

	      return 1

       fi

       if [ -z "$NETMASK" -a -z "$PREFIX" ]; then

               net_log $"error iN $FILE: didn't specify netmask or prefix"

       fi

       if [ -z "$PREFIX" ]; then

               eval $(/bin/ipcalc --prefix ${IPADDR} ${NETMASK})

       fi

       if [ -z "$BROADCAST" -o "$BROADCAST" = "$default_BROADCAST" ]; then

               eval $(/bin/ipcalc --broadcast ${IPADDR}/${PREFIX})

       fi

       if [ "$no_devices_are_up" = "yes" ]; then

               setup_this=yes

       else

               setup_this=""

               eval "

                       rdev_addr=\$rdev_${DEVNUM}_addr;

                       rdev_pb=\$rdev_${DEVNUM}_pb;

                       rdev_mark=\$rdev_${DEVNUM}_mark;

                       rdevip=\$rdevip_${IPGLOP};

               ";

               if [ -n "$rdev_addr" ]; then

                       if [ "$rdev_addr" = "${IPADDR}" ]; then

                               newmark=keep

                               if [ "$rdev_pb" != "${PREFIX}_${BROADCAST}" ]; then

                                       setup_this=freshen

                               else

                                       setup_this=no

                               fi

                       else

                               if [ "$rdev_mark" != "remove" ]; then

                                       /sbin/ip addr flush dev $parent_device label $parent_device:${DEVNUM}

                                       do_netreport=yes

                               fi

                               newmark=remove

                               setup_this=yes

                       fi

                       if [ -n "$rdev_mark" -a "$rdev_mark" != "$newmark" ]; then

                               net_log $"error in ifcfg-${parent_device}: files"

			       return 1

                       fi

                       eval " rdev_${DEVNUM}_mark=\$newmark ";

               else

                       setup_this=yes

               fi

               if [ -n "$rdevip" -a "$rdevip" != "${DEVNUM}" ]; then

                       eval " mark_remove=\$rdev_${rdevip}_mark ";

                       if [ -n "$mark_remove" -a "$mark_remove" != "remove" ]; then

                               net_log $"error in ifcfg-${parent_device}: files"

			       return 1

                       fi

                       if [ "$mark_remove" != "remove" ]; then

                               eval " rdev_${rdevip}_mark=remove ";

                               /sbin/ip addr flush dev $parent_device label $parent_device:$rdevip

                               do_netreport=yes

                       fi

               fi

       fi

       if [ "$setup_this" = "freshen" ] ; then

               # we can do the freshen stuff right now

               /sbin/ip addr change ${IPADDR}/${PREFIX} brd ${BROADCAST}

       fi

       if [ "$setup_this" = "yes" ] ; then

               if [ "${parent_device}" != "lo" ] &&  [ "${ARPCHECK}" != "no" ] && \

               is_available ${parent_device} && \

               ( grep -qswi "up" /sys/class/net/${parent_device}/operstate ||  grep -qswi "1" /sys/class/net/${parent_device}/carrier ) ; then

                   echo $"Determining if ip address ${IPADDR} is already in use for device ${parent_device}..."

                    ARPING=$(/sbin/arping -q -c 2 -w ${ARPING_WAIT:-3} -D -I ${parent_device} ${IPADDR})

                    if [ $? = 1 ]; then

                        ARPINGMAC=$(echo $ARPING |  sed -ne 's/.*\[\(.*\)\].*/\1/p')

                        net_log $"Error, some other host ($ARPINGMAC) already uses address ${IPADDR}."

                        return 1

                    fi

               fi

               /sbin/ip addr add ${IPADDR}/${PREFIX} brd ${BROADCAST} dev ${parent_device} label ${DEVICE}

               # update ARP cache of neighboring computers:

               if ! is_false "${ARPUPDATE}" && [ "${REALDEVICE}" != "lo" ]; then

                    /sbin/arping -q -A -c 1 -I ${parent_device} ${IPADDR}

                    ( sleep 2; /sbin/arping -q -U -c 1 -I ${parent_device} ${IPADDR} ) > /dev/null 2>&1 < /dev/null &

               fi

               if [ "$NO_ALIASROUTING" != yes ]; then

                       GATEWAYDEV=$network_GATEWAYDEV;

                       if [ -n "${GATEWAY}" -a \

			       \( -z "${GATEWAYDEV}" -o "${GATEWAYDEV}" = "${DEVICE}" \) ]; then

                               # set up default gateway, if it isn't already there

			       if ! is_default_gateway "$GATEWAY"; then

				       route add default gw ${GATEWAY} \

					   ${METRIC:+metric $METRIC} ${DEVICE}

			       fi

                       fi

		       /etc/sysconfig/network-scripts/ifup-routes ${DEVICE} ${NAME}

                       do_netreport=yes

                       ifuplocal_queue="$ifuplocal_queue $DEVICE"

               fi

	fi

}

if [ "$BASH_VERSINFO" ]; then shopt -s nullglob; else allow_null_glob_expansion=foo; fi

for FILE in ifcfg-${parent_device}:* ; do

       is_ignored_file "$FILE" && continue

       ini_env;

       . ./$FILE;

       [ -z "$DEVICE" ] && DEVICE=${FILE##ifcfg-}

       [ "$ONPARENT" != "no" -a "$ONPARENT" != "NO" ] && new_interface;

       unset DEVICE

done

for FILE in ifcfg-${parent_device}-range* ; do

       is_ignored_file "$FILE" && continue

       ini_env;

       . ./$FILE;

       ipaddr_prefix=${IPADDR_START%.*}

       ipaddr_startnum=${IPADDR_START##*.}

       ipaddr_endnum=${IPADDR_END##*.}

       if [ "${IPADDR_START%.*}" != "${IPADDR_END%.*}" ]; then

               net_log $"error in $FILE: IPADDR_START and IPADDR_END don't agree"; continue

       fi

       if [ $ipaddr_startnum -gt $ipaddr_endnum ]; then

               net_log $"error in $FILE: IPADDR_START greater than IPADDR_END"; continue

       fi

       ipaddr_num=$ipaddr_startnum

       ipaddr_clonenum=$CLONENUM_START

       while [ $ipaddr_num -le $ipaddr_endnum ]; do

               IPADDR="$ipaddr_prefix.$ipaddr_num"

               DEVICE="$parent_device:$ipaddr_clonenum"

	       [ "$ONPARENT" != "no" -a "$ONPARENT" != "NO" ] && new_interface;

               ipaddr_num=$(($ipaddr_num+1))

               ipaddr_clonenum=$(($ipaddr_clonenum+1))

       done

done

       #

       # Remove any devices that should not be around

       #

	for DEVNUM in $rdev_LIST ; do

	       eval " rdev_mark=\$rdev_${DEVNUM}_mark ";

	       if [ -z "$rdev_mark" ]; then

	               /sbin/ip addr flush dev $parent_device label $parent_device:${DEVNUM}

        	       do_netreport=yes

	       fi

	done

       #

       # Notify of new device creation

       #

if [ -n "$do_netreport" ]; then

       do_netreport

fi

if [ -x /sbin/ifup-local ]; then

       for DEVICE in $ifuplocal_queue ; do

               /sbin/ifup-local ${DEVICE}

       done

fi