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macchanger
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2006-04-25
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# Copyright (c) 2004-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header$
# Contributed by Roy Marples (uberlord@gentoo.org)
# char* macchanger_provides(void)
#
# Returns a string to change module definition for starting up
macchanger_provides() {
echo "macchanger"
}
# void macchanger_depend(void)
#
# Sets up the dependancies for the module
macchanger_depend() {
before interface wireless
}
# bool macchanger_check_installed(void)
#
# Returns 1 if macchanger is installed, otherwise 0
macchanger_check_installed() {
[[ -x /sbin/macchanger ]] && return 0
${1:-false} && eerror "For changing MAC addresses, emerge net-analyzer/macchanger"
return 1
}
# bool macchanger_check_depends(void)
#
# Checks to see if we have the needed functions
macchanger_check_depends() {
local f
for f in interface_variable interface_get_mac_address; do
[[ $( type -t ${f} ) == function ]] && continue
eerror "macchanger: missing required function ${f}\n"
return 1
done
return 0
}
# bool macchanger_pre_start(char *iface)
#
# Configures the MAC address for iface
macchanger_pre_start() {
local iface=${1} mac opts
local ifvar=$( interface_variable ${1} )
eval mac=\"\$\{mac_${ifvar}\}\"
[[ -z ${mac} ]] && return 0
interface_exists ${iface} true || return 1
mac=$( echo ${mac} | tr '[:upper:]' '[:lower:]' )
case "${mac}" in
# specific mac-addr, i wish there were a shorter way to specify this
[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]) opts="${opts} --mac=${mac}" ;;
# increment MAC address, default macchanger behavior
increment) opts="${opts}" ;;
# randomize just the ending bytes
random-ending) opts="${opts} -e" ;;
# keep the same kind of physical layer (eg fibre, copper)
random-samekind) opts="${opts} -a" ;;
# randomize to any known vendor of any physical layer type
random-anykind) opts="${opts} -A" ;;
# fully random bytes
random-full) opts="${opts} -r" ;;
# default case is just to pass on all the options
*) opts="${opts} ${mac}" ;;
esac
# The interface needs to be up for macchanger to work most of the time
interface_down ${iface}
ebegin "Changing MAC address of ${iface}"
mac=$( /sbin/macchanger ${opts} ${iface} 2>/dev/null | awk '/Faked MAC:/ { print toupper($3) }' )
# Sometimes the interface needs to be up ....
if [[ -z ${mac} ]]; then
interface_up ${iface}
mac=$( /sbin/macchanger ${opts} ${iface} 2>/dev/null | awk '/Faked MAC:/ { print toupper($3) }' )
fi
if [[ -z ${mac} ]]; then
eend 1 "Failed to set MAC address"
return 1
fi
eend 0
eindent
einfo "changed to ${mac}"
eoutdent
return 0 #important
}