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You can now spoof the source address for arping as the third parameter in gateways_eth0 if you have arping2 installed, #180888.

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This commit is contained in:
Roy Marples 2007-10-30 11:39:19 +00:00
parent 1152e2677c
commit 6ffd3b5289
3 changed files with 44 additions and 23 deletions
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5
ChangeLog
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@ -1,6 +1,11 @@
# ChangeLog for Gentoo System Intialization ("rc") scripts
# Copyright 1999-2007 Gentoo Foundation; Distributed under the GPLv2
30 Oct 2007; Roy Marples <uberlord@gentoo.org>:
You can now spoof the source address for arping as the third parameter
in gateways_eth0 if you have arping2 installed, #180888.
29 Oct 2007; Roy Marples <uberlord@gentoo.org>:
rc --override foo will override the runlevel to load after boot

7
conf.d.Linux/net.example
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@ -528,6 +528,13 @@
#routes_010000000001_334455DDEEFF="default via 10.0.0.1"
#dns_servers_010000000001_334455DDEEFF="10.0.0.1"
# If you need to spoof the source address, you can add that as third parameter
# like so
#gateways_eth0="192.168.0.1,00:11:22:AA:BB:CC,192.168.0.50"
#or
#gateways_eth0="192.168.0.1,,192.168.0.50"
# This requires arping to be installed though
# If we don't find any gateways (or there are none configured) then we try and
# use APIPA to find a free address in the range 169.254.0.0-169.254.255.255
# by arping a random address in that range on the interface. If no reply is

41
net.Linux/arping.sh
View File

@ -2,12 +2,12 @@
# Distributed under the terms of the GNU General Public License v2
arping_depend() {
program /sbin/arping
program /sbin/arping /usr/sbin/arping2
before interface
}
arping_address() {
local ip=${1%%/*} mac="$2" foundmac= i= w= opts=
local ip=${1%%/*} mac="$2" spoof="$3" foundmac= i= w= opts=
# We only handle IPv4 addresses
case "${ip}" in
@ -23,10 +23,20 @@ arping_address() {
eval w=\$arping_wait_${IFVAR}
[ -z "${w}" ] && w=${arping_wait:-5}
if type arping2 >/dev/null 2>&1; then
[ -z "$(_get_inet_address)" ] && opts="${opts} -0"
[ -n "${spoof}" ] && opts="${opts} -S ${spoof}"
while [ ${w} -gt 0 -a -z "${foundmac}" ]; do
foundmac="$(arping2 ${opts} -r -c 1 -0 -i "${IFACE}" "${ip}" 2>/dev/null | \
sed -e 'y/abcdef/ABCDEF/')"
w=$((${w} - 1))
done
else
[ -z "$(_get_inet_address)" ] && opts="${opts} -D"
foundmac="$(arping -w "${w}" ${opts} -f -I "${IFACE}" "${ip}" 2>/dev/null | \
sed -n -e 'y/abcdef/ABCDEF/' -e 's/.*\[\([^]]*\)\].*/\1/p')"
fi
[ -z "${foundmac}" ] && return 1
if [ -n "${mac}" ] ; then
@ -41,7 +51,7 @@ arping_address() {
_arping_in_config() {
_get_array "config_${IFVAR}" | while read i; do
[ "${i}" = "arping" ] && return 0
[ "${i}" = "arping" ] && return 1
done
return 1
}
@ -51,7 +61,7 @@ arping_start() {
einfo "Pinging gateways on ${IFACE} for configuration"
eval gateways=\$gateways_${IFVAR}
if [ -n "${gateways}" ] ; then
if [ -z "${gateways}" ] ; then
eerror "No gateways have been defined (gateways_${IFVAR}=\"...\")"
return 1
fi
@ -61,7 +71,7 @@ arping_start() {
for x in ${gateways}; do
local IFS=,
set -- ${x}
local ip=$1 mac=$2 extra=
local ip=$1 mac=$2 spoof=$3 extra=
unset IFS
if [ -n "${mac}" ] ; then
@ -70,9 +80,8 @@ arping_start() {
fi
vebegin "${ip} ${extra}"
if arping_address "${ip}" "${mac}" ; then
local OIFS=$IFS SIFS=${IFS-y}
IFS=.
if arping_address "${ip}" "${mac}" "${spoof}" ; then
local IFS=.
for i in ${ip} ; do
if [ "${#i}" = "2" ] ; then
conf="${conf}0${i}"
@ -82,27 +91,27 @@ arping_start() {
conf="${conf}${i}"
fi
done
if [ "${SIFS}" = "y" ] ; then
IFS=$OFIS
else
unset IFS
fi
[ -n "${mac}" ] && conf="${conf}_$(echo "${mac}" | sed -e 's/://g')"
veend 0
eend 0
eoutdent
veinfo "Configuring ${IFACE} for ${ip} ${extra}"
_configure_variables "${conf}"
_configure_variables ${conf}
# Call the system module as we've aleady passed it by ....
# And it *has* to be pre_start for other things to work correctly
system_pre_start
# Ensure that we have a valid config - ie arping is no longer there
if _arping_in_config; then
veend 1 "No config found for ${ip} (config_${conf}=\"...\")"
local IFS="$__IFS"
for i in $(_get_array "config_${IFVAR}"); do
if [ "${i}" = "arping" ]; then
eend 1 "No config found for ${ip} (config_${conf}=\"...\")"
continue 2
fi
done
unset IFS
_load_config
return 0