Attachment 91386 Details for Bug 75570 – drop-in replacement for nameif(8)

drop-in replacement for nameif(8)

nameif (text/plain), 3.84 KB, created by Ole Craig on 2003-04-29 14:32:38 UTC

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Creator: Ole Craig

Created: 2003-04-29 14:32:38 UTC

Size: 3.84 KB

patch

obsolete

>#!/bin/bash
>
># Copyright (c) 2003 Ole Craig <olc@cs.umass.edu>, all rights
># reserved. This software may be freely redistributed under the terms
># of the GNU general public license. See (e.g.)
># http://www.gnu.org/licenses/gpl.txt for details. Although it is not
># required by the license terms, if you improve this script in any way
># the author would deeply appreciate seeing (and perhaps learning
># from) your changes.
>
># we use this script because regular nameif doesn't handle the case
># where we want to rename preexisting devices (e.g. swap eth0 <-->
># eth1) and sometimes segfaults anyway.
>
># quick'n'dirty method for dealing with errout (overrideable with -s)
>logger="echo `basename $0[$$]`: "
>
>function usage() {
>    echo "usage: `basename $0` [-c configurationfile] [-s] {ifname macaddress}"
>    exit -1
>}
>
>function loggit() {
>    $logger "$*"
>}
>
>function die () {
>    loggit $*
>    exit -1
>}
>function namer() {
># this is where we do the work on a given IF
># expect 2 inputs: current name targetname
>    err=`ip link set $1 name $2`
>    status=$?
>    if [ "$err" != "" ]; then 
>	$logger $err
>    fi
>    return $status
>}
>
>function isup() {
>    # check to see if interface is active
>    ip link show $1 2>&1 | cut -f3 -d" " | grep -qw UP
>    return $?
>}
>
># main body
>if [ ${#*} == 0 ]; then
>    # we get our parameters from /etc/mactab unless otherwise specified
>    CONFFILE=/etc/mactab
>else
>    while [ ${#*} -gt 0 ]; do 
>	case $1 in 
>	    -s)
>	    logger="logger -i -t `basename $0`"
>	    shift
>	    ;;
>	    -c)
>		if [ "$2" == "" -o ! -r $2 ]; then
>		    usage
>		else
>		    CONFFILE=$2
>		    shift
>		    shift
>		fi
>		;;
>	    *)
># we assume anything else is an interface name
>		if [ "$2" == "" -o "$3" != "" ]; then
>		    usage
>		else 
>		    DES_IFNAME=$1
>		    # attempt to sanitize input a bit
>		    DES_MAC=`echo $2 | tr 'a-f-' 'A-F:'`
>		    shift
>		    shift
>		fi
>
>
>	esac
>    done
>    
>    i=0 
>    BLOCKED=0
>fi
>if [ "$DES_IFNAME" = "" ]; then
># if we're processing a table (/etc/mactab by default) then we iterate
># through...
>    
>    itab=0
>    for q in `cat $CONFFILE`; do 
>	MACTABLE[$itab]=$q
>	let itab++
>    done
>    
># ...and recurse
>    for (( q=0 ; $q < $itab ; q++)); do
>	$0 ${MACTABLE[((q++))]} ${MACTABLE[$q]}
># note nasty increment of counter within loop. Ugh.
>    done
>else # we were given an argument, use it
>    
># Build table of current IFs and their associated MAC addresses. While
># we're at it, grab current values for IF name and IF/MAC of blocking
># name, if any.  If we only have one MAC address as input, then we
># scan the table of available IFs for a match. If that MAC is
># currently in use by another IF name, we swap. Otherwise, we just
># name it. (Or leave it alone, as may be the case.)
>    
># DES_IFNAME is the desired name for the mac address supplied on commandline.
>    
>    i=0
>    GETMAC=0
>    for q in `ifconfig -a | grep -E ^eth | awk '{ print $1" "$5 }'`; do
>	MACDESK[$i]=$q
>	if [ "$GETMAC" != "0" ]; then
>	    CUR_MAC=$q
>	    GETMAC=0
>	fi
>	if [ "$q" == "$DES_MAC" ]; then
>	    CUR_IFNAME=${MACDESK[$i-1]}
>	fi
>	if [ "$q" == "$DES_IFNAME" ]; then
>	    BLOCKED=1
>	    GETMAC=1
>	fi
>	let i++
>    done
>    
># CUR_IFNAME is the current name for the mac address supplied on commandline.
># if $CUR_IFNAME is empty at this point, then we don't have an
># interface with this MAC address
>
>if [ "$CUR_IFNAME" == "" ]; then
>    die "no interface found with requested MAC address \"$DES_MAC\""
>fi
>
># swap "blocked" names
>    isup $DES_IFNAME && die "$DES_IFNAME ($CUR_MAC) already active"
>    isup $CUR_IFNAME && die "$CUR_IFNAME ($DES_MAC) already active"
>    if [ "$CUR_IFNAME" == "$DES_IFNAME" ]; then
>	exit 0 # everything's jake, current and desired IF names are the same
>    fi
>    if [ $BLOCKED == 1 ]; then
>	namer $DES_IFNAME nameif_tmp$DES_IFNAME
>	namer $CUR_IFNAME $DES_IFNAME
>	namer nameif_tmp$DES_IFNAME $CUR_IFNAME
>    else
>	namer $CUR_IFNAME $DES_IFNAME
>    fi
>    
>fi
>
>
>
>

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Attachments on bug 75570: 91383 | 91386