#!/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 device info is placed
# into variables in the form: rdev_$DEVICE_addr, dev_$DEVICE_mb and
# rdevip_$IPGLOP. A list of all the devices is created in rdev_LIST.
eval $(LC_ALL= LANG= /sbin/ifconfig | LC_ALL=C sed -n '
# Alias name: store the number in TMP, ignore the following address if the
# device name does not match. This may leave a hanging ||, so dummy X=x
# comands are used to ignore a possible previous condition.
/^[^[:space:]]*:[0-9A-Za-z_]*/ {
s|^\([^:]*\):\([0-9A-Za-z_]*\).*$|X=x; TMP="\2"; [ "$device" != "\1" ] \|\| |p
b
}
# Non-alias device: always ignore the following address
/^[^[:space:]]/ {
s|^.*$|X=x; true \|\| |p
b
}
# Address: Preceded by a device name, which was converted into
# condition ||
# So this triggers only for $device.
# Add a trailing || (which will be swallowed by X=x) to keep the syntax
# correct.
/inet addr:[0-9]*\.[0-9]*\.[0-9]*\.[0-9]* *Bcast:[0-9.]* *Mask:[0-9.]*/ {
s|^.*inet addr:\(\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)\) *Bcast:\([0-9.]*\) *Mask:\([0-9.]*\).*$|eval "rdev_${TMP}_addr=\1; rdev_${TMP}_mb=\7_\6; rdevip_\2_\3_\4_\5=${TMP}; rdev_LIST=\\"\\$rdev_LIST \\${TMP}\\"; " \|\| |p
b
}') X=x
if [ -z "$rdev_LIST" ]; then
no_devices_are_up=yes
fi
##for DEVNUM in $rdev_LIST ; do
##eval "
##echo \"rdev_${DEVNUM}_addr = \$rdev_${DEVNUM}_addr\"
##echo \"rdev_${DEVNUM}_mb = \$rdev_${DEVNUM}_mb\" ";
##done
##echo ""; echo "-----"; echo ""
#
# Store configuration of the parent device and network
#
# read from the /etc/sysconfig/network
eval ` (
. /etc/sysconfig/network;
echo network_GATEWAY=$GATEWAY\;;
echo network_GATEWAYDEV=$GATEWAYDEV\;;
) `
# read defaults from the parent config file
[ -f $PARENTCONFIG ] || {
echo $"Missing config file $PARENTCONFIG." >&2
exit 1
}
eval ` (
. $PARENTCONFIG;
echo default_NETMASK=$NETMASK\;;
echo default_BROADCAST=$BROADCAST\;;
echo default_GATEWAY=$GATEWAY\;;
echo default_NO_ALIASROUTING=$NO_ALIASROUTING\;;
) `
[ -z "$default_GATEWAY" ] && default_GATEWAY=$network_GATEWAY
function ini_env ()
{
DEVICE=""
IPADDR=""
NETMASK=$default_NETMASK
BROADCAST=$default_BROADCAST
GATEWAY=$default_GATEWAY
NO_ALIASROUTING=$default_NO_ALIASROUTING
ONPARENT=""
}
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
echo $"error in $FILE: invalid alias number" >&2
return 1
fi
eval "
ipseen=\$ipseen_${IPGLOP}; devseen=\$devseen_${DEVNUM};
ipseen_${IPGLOP}=$FILE; devseen_${DEVNUM}=$FILE;
";
if [ -n "$ipseen" ]; then
echo $"error in $FILE: already seen ipaddr $IPADDR in $ipseen" >&2
return 1
fi
if [ -n "$devseen" ]; then
echo $"error in $FILE: already seen device $parent_device:$DEVNUM in $devseen" >&2
return 1
fi
if [ -z "$DEVICE" -o -z "$IPADDR" ]; then
echo $"error in $FILE: didn't specify device or ipaddr" >&2
return 1
fi
if [ -z "$NETMASK" ]; then
eval `/bin/ipcalc --netmask ${IPADDR}`
fi
if [ -z "$BROADCAST" -o "$BROADCAST" = "$default_BROADCAST" ]; then
eval `/bin/ipcalc --broadcast ${IPADDR} ${NETMASK}`
nma=$NETMASK; nmb=${nma#*.}; nmc=${nmb#*.};
NMGLOP="${nma%%.*}_${nmb%%.*}_${nmc%%.*}_${nmc#*.}";
if [ ${nma%%.*} -eq 0 ]; then ipnm_a=0; else ipnm_a=${ipa%%.*}; fi
if [ ${nmb%%.*} -eq 0 ]; then ipnm_b=0; else ipnm_b=${ipb%%.*}; fi
if [ ${nmc%%.*} -eq 0 ]; then ipnm_c=0; else ipnm_c=${ipc%%.*}; fi
if [ ${nmc#*.} -eq 0 ]; then ipnm_d=0; else ipnm_d=${ipc#*.}; fi
CACHENAME="${NMGLOP}_${ipnm_a}_${ipnm_b}_${ipnm_c}_${ipnm_d}"
eval "
if [ -z \"\$bcastcache_${CACHENAME}\" ]; then
eval `/bin/ipcalc --broadcast \$IPADDR \$NETMASK`
bcastcache_${CACHENAME}=\$BROADCAST
else
BROADCAST=\$bcastcache_${CACHENAME}
fi
";
fi
##echo "";
##echo "----------------------------"
##echo "device = $DEVICE"
##echo "ipaddr = $IPADDR"
##echo "netmask = $NETMASK"
##echo "broadcast = $BROADCAST"
##echo "devnum = $DEVNUM";
##echo "";
if [ "$no_devices_are_up" = "yes" ]; then
setup_this=yes
else
setup_this=""
eval "
rdev_addr=\$rdev_${DEVNUM}_addr;
rdev_mb=\$rdev_${DEVNUM}_mb;
rdev_mark=\$rdev_${DEVNUM}_mark;
rdevip=\$rdevip_${IPGLOP};
";
if [ -n "$rdev_addr" ]; then
if [ "$rdev_addr" = "${IPADDR}" ]; then
newmark=keep
if [ "$rdev_mb" != "${NETMASK}_${BROADCAST}" ]; then
setup_this=freshen
else
setup_this=no
fi
else
if [ "$rdev_mark" != "remove" ]; then
##echo "removing device $parent_device:${DEVNUM} (devnum conflict)"
/sbin/ifconfig $parent_device:${DEVNUM} down
do_netreport=yes
fi
newmark=remove
setup_this=yes
fi
if [ -n "$rdev_mark" -a "$rdev_mark" != "$newmark" ]; then
echo $"error in ifcfg-${parent_device}: files" >&2
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
echo $"error in ifcfg-${parent_device}: files" >&2
return 1
fi
if [ "$mark_remove" != "remove" ]; then
eval " rdev_${rdevip}_mark=remove ";
##echo "removing device $parent_device:$rdevip (ipaddr conflict)"
/sbin/ifconfig $parent_device:$rdevip down
do_netreport=yes
fi
fi
fi
if [ "$setup_this" = "freshen" ] ; then
# we can do the freshen stuff right now
##echo "freshening device $DEVICE"
/sbin/ifconfig $DEVICE netmask $NETMASK broadcast $BROADCAST;
fi
if [ "$setup_this" = "yes" ] ; then
##echo "setting up device $DEVICE"
/sbin/ifconfig ${DEVICE} ${IPADDR} netmask ${NETMASK} broadcast ${BROADCAST}
if [ "$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
echo $"error in $FILE: IPADDR_START and IPADDR_END don't agree" >&2; continue
fi
if [ $ipaddr_startnum -gt $ipaddr_endnum ]; then
echo $"error in $FILE: IPADDR_START greater than IPADDR_END" >&2; continue
fi
ipaddr_num=$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;
let 'ipaddr_num=ipaddr_num+1'
let '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
##echo "removing device $parent_device:${DEVNUM} (lingering)"
/sbin/ifconfig $parent_device:${DEVNUM} down
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
