372 lines
12 KiB
Bash
Executable File
372 lines
12 KiB
Bash
Executable File
#!/bin/bash
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#
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# configures aliases of device $1
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#
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# This script goes out of its way to arrive at the configuration of ip
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# aliases described in the ifcfg-$DEV:* and ifcfg-$DEV-range* files from
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# whatever existing configuration it may be given: existing aliases not
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# specified in the configuration will be removed, netmasks and broadcast
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# addrs will be updated on existing aliases, and new aliases will be setup.
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#
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# range specification files:
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#
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# One can specify ranges of alised ipaddress using ifcfg-$DEV-range* files.
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# Specify multiple ranges using multiple files, such as ifcfg-eth0-range0 and
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# ifcfg-eth0-range1, etc. In these files, the following configuration variables
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# specify the range:
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#
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# IPADDR_START -- ipaddr to start range at. eg "192.168.30.1"
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# IPADDR_END -- ipaddr to end range at. eg "192.168.30.254"
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# CLONENUM_START -- interface clone number to start using for this range. eg "0"
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#
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# The above example values create the interfaces eth0:0 through eth0:253 using
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# ipaddrs 192.168.30.1 through 192.168.30.254, inclusive.
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#
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# Other configuration variables such as NETMASK and BROADCAST may be specified
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# in the range file and will apply to all of the ipaddresses in the range. Range
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# files also inherit configuration from the ifcfg-$DEV file just like normal.
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#
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# Note that IPADDR_START and IPADR_END are required to be in the same class-c
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# block. I.e. IPADDR_START=192.168.30.1 and IPADDR_END=192.168.31.255 is
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# not valid.
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#
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# speed with large sets of interfaces:
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#
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# Considerable effort was spent making this script fast. It can efficiently
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# handle a thousand ip aliases on one interface.
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#
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# With large sets of ipaddresses the NO_ALIASROUTING=yes configuration is
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# highly recommended. (This can be specified in ifcfg-$DEV and inherited.) This
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# prevents this script from setting up routing details for the virtual
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# interfaces, which I don't think is needed, because outgoing traffic can use the
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# main interface. However, make your own conclusions on what you need.
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#
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# My test setup of four class C address blocks on a P166 took 25 seconds of
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# which 16 seconds of this was spent in the ifcconfig calls. Without the
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# NO_ALIASROUTING=yes config an additional 12 seconds is spent in route calls.
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#
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# notes on internals:
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#
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# This script uses the bash "eval" command to lookup shell variables with names
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# which are generated from other shell variables. This allows us to, in effect,
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# create hashes using the shell variable namesspace by just including the hash
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# key in the name of the variable.
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#
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# This script originally written by: David Harris <dharris@drh.net>
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# Principal Engineer, DRH Internet
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# June 30, 1999
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#
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# modified by: Bill Nottingham <notting@redhat.com>
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TEXTDOMAIN=initscripts
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TEXTDOMAINDIR=/etc/locale
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device=$1
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if [ "$device" = "" ]; then
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echo $"usage: ifup-aliases <net-device> [<parent-config>]\n"
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exit 1
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fi
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PARENTCONFIG=${2:-ifcfg-$device}
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parent_device=$device
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cd /etc/sysconfig/network-scripts
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. ./network-functions
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# Grab the current configuration of any running aliases, place device info
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# into variables of the form:
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# rdev_<index>_addr = <ip address>
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# rdev_<index>_pb = <prefix>_<broadcast>
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# rdevip_<ipaddress> = <index>
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# Example:
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# rdev_0_addr=192.168.1.1
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# rdev_0_pb=24_192.16.1.255
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# rdevip_192_168_1_1=0
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#
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# A list of all the devices is created in rdev_LIST.
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eval $( ip addr show $device label $device:* | \
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awk 'BEGIN { COUNT=0;LAST_DEV="" } /inet / {
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# Split IP address into address/prefix
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split($2,IPADDR,"/");
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# Create A_B_C_D IP address form
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IP_ADDR=IPADDR[1];
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gsub(/\./,"_",IP_ADDR);
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# Split device into device:index
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split($NF,DEV,":");
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# Update last device
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LAST_DEV=LAST_DEV " " DEV[2];
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printf("rdev_%s_addr=%s\nrdevip_%s=%s\nrdev_%s_pb=%s_%s\nrdev_LIST=\"%s\"\n",
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DEV[2],IPADDR[1],IP_ADDR,DEV[2],DEV[2],IPADDR[2],$4,LAST_DEV);
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} END {
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if(LAST_DEV == "") print "no_devices_are_up=yes"
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}' );
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#
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# Store configuration of the parent device and network
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#
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# read from the /etc/sysconfig/network
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eval ` (
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. /etc/sysconfig/network;
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echo network_GATEWAY=$GATEWAY\;;
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echo network_GATEWAYDEV=$GATEWAYDEV\;;
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) `
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# read defaults from the parent config file
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[ -f $PARENTCONFIG ] || {
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net_log $"Missing config file $PARENTCONFIG."
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exit 1
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}
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eval ` (
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. ./$PARENTCONFIG;
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echo default_PREFIX=$PREFIX\;;
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echo default_NETMASK=$NETMASK\;;
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echo default_BROADCAST=$BROADCAST\;;
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echo default_GATEWAY=$GATEWAY\;;
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echo default_NO_ALIASROUTING=$NO_ALIASROUTING\;;
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echo default_ARPCHECK=$ARPCHECK\;;
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echo default_ARPUPDATE=$ARPUPDATE\;;
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) `
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[ -z "$default_GATEWAY" ] && default_GATEWAY=$network_GATEWAY
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function ini_env ()
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{
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DEVICE=""
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IPADDR=""
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IPV6ADDR=""
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PREFIX=$default_PREFIX
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NETMASK=$default_NETMASK
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BROADCAST=$default_BROADCAST
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GATEWAY=$default_GATEWAY
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NO_ALIASROUTING=$default_NO_ALIASROUTING
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ONPARENT=""
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ARPCHECK=$default_ARPCHECK
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ARPUPDATE=$default_ARPUPDATE
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}
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function is_default_gateway ()
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{
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LC_ALL=C /sbin/ip route ls default scope global \
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| awk '$3 == "'"$1"'" { found = 1; } END { exit found == 0; }'
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}
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#
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# Read the alias configuration files and enable each aliased
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# device using new_interface()
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#
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function new_interface ()
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{
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ipa=$IPADDR; ipb=${ipa#*.}; ipc=${ipb#*.};
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IPGLOP="${ipa%%.*}_${ipb%%.*}_${ipc%%.*}_${ipc#*.}";
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DEVNUM=${DEVICE#*:}
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MATCH='^[0-9A-Za-z_]*$'
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if (LC_ALL=C; [[ ! "$DEVNUM" =~ $MATCH ]]); then
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net_log $"error in $FILE: invalid alias number"
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return 1
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fi
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eval "
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ipseen=\$ipseen_${IPGLOP}; devseen=\$devseen_${DEVNUM};
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ipseen_${IPGLOP}=$FILE; devseen_${DEVNUM}=$FILE;
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";
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if [ -n "$ipseen" ]; then
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net_log $"error in $FILE: already seen ipaddr $IPADDR in $ipseen"
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return 1
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fi
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if [ -n "$devseen" ]; then
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net_log $"error in $FILE: already seen device $parent_device:$DEVNUM in $devseen"
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return 1
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fi
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if [ -z "$DEVICE" -o -z "$IPADDR" ]; then
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if [ -n "$IPV6ADDR" -a -n "$DEVICE" ] && ! is_false "$IPV6INIT"; then
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/etc/sysconfig/network-scripts/ifup-ipv6 ${DEVICE}
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return $?
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fi
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net_log $"error in $FILE: didn't specify device or ipaddr"
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return 1
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fi
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if [ -z "$NETMASK" -a -z "$PREFIX" ]; then
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net_log $"error iN $FILE: didn't specify netmask or prefix"
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fi
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if [ -z "$PREFIX" ]; then
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eval $(/bin/ipcalc --prefix ${IPADDR} ${NETMASK})
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fi
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if [ -z "$BROADCAST" -o "$BROADCAST" = "$default_BROADCAST" ]; then
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eval $(/bin/ipcalc --broadcast ${IPADDR}/${PREFIX})
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fi
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if [ "$no_devices_are_up" = "yes" ]; then
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setup_this=yes
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else
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setup_this=""
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eval "
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rdev_addr=\$rdev_${DEVNUM}_addr;
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rdev_pb=\$rdev_${DEVNUM}_pb;
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rdev_mark=\$rdev_${DEVNUM}_mark;
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rdevip=\$rdevip_${IPGLOP};
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";
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if [ -n "$rdev_addr" ]; then
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if [ "$rdev_addr" = "${IPADDR}" ]; then
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newmark=keep
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if [ "$rdev_pb" != "${PREFIX}_${BROADCAST}" ]; then
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setup_this=freshen
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else
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setup_this=no
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fi
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else
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if [ "$rdev_mark" != "remove" ]; then
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/sbin/ip addr flush dev $parent_device label $parent_device:${DEVNUM}
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fi
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newmark=remove
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setup_this=yes
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fi
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if [ -n "$rdev_mark" -a "$rdev_mark" != "$newmark" ]; then
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net_log $"error in ifcfg-${parent_device}: files"
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return 1
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fi
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eval " rdev_${DEVNUM}_mark=\$newmark ";
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else
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setup_this=yes
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fi
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if [ -n "$rdevip" -a "$rdevip" != "${DEVNUM}" ]; then
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eval " mark_remove=\$rdev_${rdevip}_mark ";
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if [ -n "$mark_remove" -a "$mark_remove" != "remove" ]; then
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net_log $"error in ifcfg-${parent_device}: files"
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return 1
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fi
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if [ "$mark_remove" != "remove" ]; then
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eval " rdev_${rdevip}_mark=remove ";
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/sbin/ip addr flush dev $parent_device label $parent_device:$rdevip
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fi
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fi
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fi
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if [ "$setup_this" = "freshen" ] ; then
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# we can do the freshen stuff right now
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/sbin/ip addr change ${IPADDR}/${PREFIX} brd ${BROADCAST}
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fi
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if [ "$setup_this" = "yes" ] ; then
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if [ "${parent_device}" != "lo" ] && [ "${ARPCHECK}" != "no" ] && \
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is_available ${parent_device} && \
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( grep -qswi "up" /sys/class/net/${parent_device}/operstate || grep -qswi "1" /sys/class/net/${parent_device}/carrier ) ; then
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echo $"Determining if ip address ${IPADDR} is already in use for device ${parent_device}..."
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ARPING=$(/sbin/arping -c 2 -w ${ARPING_WAIT:-3} -D -I ${parent_device} ${IPADDR})
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if [ $? = 1 ]; then
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ARPINGMAC=$(echo $ARPING | sed -ne 's/.*\[\(.*\)\].*/\1/p')
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net_log $"Error, some other host ($ARPINGMAC) already uses address ${IPADDR}."
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return 1
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fi
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fi
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/sbin/ip addr add ${IPADDR}/${PREFIX} brd ${BROADCAST} \
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dev ${parent_device} label ${DEVICE}
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# update ARP cache of neighboring computers:
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if ! is_false "${ARPUPDATE}" && [ "${REALDEVICE}" != "lo" ]; then
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/sbin/arping -q -A -c 1 -w ${ARPING_UPDATE_WAIT:-3} -I ${parent_device} ${IPADDR}
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( sleep 2;
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/sbin/arping -q -U -c 1 -w ${ARPING_UPDATE_WAIT:-3} -I ${parent_device} ${IPADDR} ) > /dev/null 2>&1 < /dev/null &
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fi
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! is_false "$IPV6INIT" && \
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/etc/sysconfig/network-scripts/ifup-ipv6 ${DEVICE}
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if [ "$NO_ALIASROUTING" != yes ]; then
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GATEWAYDEV=$network_GATEWAYDEV;
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if [ -n "${GATEWAY}" -a \
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\( -z "${GATEWAYDEV}" -o "${GATEWAYDEV}" = "${DEVICE}" \) ]; then
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# set up default gateway, if it isn't already there
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if ! is_default_gateway "$GATEWAY"; then
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ip route replace default ${METRIC:+metric $METRIC} via ${GATEWAY} dev ${DEVICE}
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fi
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fi
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/etc/sysconfig/network-scripts/ifup-routes ${DEVICE} ${NAME}
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ifuplocal_queue="$ifuplocal_queue $DEVICE"
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fi
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fi
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}
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if [ "$BASH_VERSINFO" ]; then
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shopt -s nullglob
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else
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allow_null_glob_expansion=foo
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fi
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for FILE in ifcfg-${parent_device}:* ; do
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is_ignored_file "$FILE" && continue
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ini_env
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. ./$FILE
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[ -z "$DEVICE" ] && DEVICE=${FILE##ifcfg-}
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[ "$ONPARENT" != "no" -a "$ONPARENT" != "NO" ] && new_interface
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unset DEVICE
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done
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for FILE in ifcfg-${parent_device}-range* ; do
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is_ignored_file "$FILE" && continue
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ini_env
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. ./$FILE
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ipaddr_prefix=${IPADDR_START%.*}
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ipaddr_startnum=${IPADDR_START##*.}
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ipaddr_endnum=${IPADDR_END##*.}
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if [ "${IPADDR_START%.*}" != "${IPADDR_END%.*}" ]; then
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net_log $"error in $FILE: IPADDR_START and IPADDR_END don't agree"
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continue
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fi
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if [ $ipaddr_startnum -gt $ipaddr_endnum ]; then
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net_log $"error in $FILE: IPADDR_START greater than IPADDR_END"
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continue
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fi
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ipaddr_num=$ipaddr_startnum
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ipaddr_clonenum=$CLONENUM_START
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while [ $ipaddr_num -le $ipaddr_endnum ]; do
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IPADDR="$ipaddr_prefix.$ipaddr_num"
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DEVICE="$parent_device:$ipaddr_clonenum"
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IPV6INIT="no"
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[ "$ONPARENT" != "no" -a "$ONPARENT" != "NO" ] && new_interface
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ipaddr_num=$(($ipaddr_num+1))
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ipaddr_clonenum=$(($ipaddr_clonenum+1))
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done
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done
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#
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# Remove any devices that should not be around
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#
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for DEVNUM in $rdev_LIST ; do
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eval " rdev_mark=\$rdev_${DEVNUM}_mark "
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if [ -z "$rdev_mark" ]; then
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/sbin/ip addr flush dev $parent_device label $parent_device:${DEVNUM}
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fi
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done
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if [ -x /sbin/ifup-local ]; then
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for DEVICE in $ifuplocal_queue ; do
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/sbin/ifup-local ${DEVICE}
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done
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fi
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