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#!/bin/bash
# Copyright (c) 2004-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Contributed by Roy Marples (uberlord@gentoo.org)
# char* apipa_provides(void)
#
# Returns a string to change module definition for starting up
apipa_provides() {
echo "apipa"
}
# void apipa_depend(void)
#
# Sets up the dependancies for the module
apipa_depend() {
after system dhcp vlan
}
# bool apipa_check_installed(void)
#
# Returns 1 if ifenslave is installed, otherwise 0
apipa_check_installed() {
[[ -x /sbin/arping || -x /usr/sbin/arping2 ]] && return 0
if ${1:-false}; then
eerror "For Automatic Private IP Addressing (APIPA) support"
eerror "emerge net-misc/iputils or net-analyzer/arping"
fi
return 1
}
# bool apipa_check_depends(void)
#
# Checks to see if we have the needed functions
apipa_check_depends() {
local f
for f in interface_exists interface_up; do
[[ $( type -t "${f}" ) == "function" ]] && continue
eerror "apipa: missing required function ${f}\n"
return 1
done
return 0
}
# bool address_exists(char *interface, char *address)
#
# Returns 0 if the address on the interface responds to an arping
# 1 if not - packets defaults to 1
# If neither arping (net-misc/iputils) or arping2 (net-analyzer/arping)
# is installed then we return 1
address_exists() {
local iface="$1" address="${2%%/*}" i
# We only handle IPv4 addresses
[[ ${address} != *.*.*.* ]] && return 1
# We need to bring the interface up to test
interface_up "${iface}"
if [[ -x /sbin/arping ]]; then
/sbin/arping -q -c 2 -w 3 -D -f -I "${iface}" "${address}" \
&>/dev/null || return 0
elif [[ -x /usr/sbin/arping2 ]]; then
for (( i=0; i<3; i++ )); do
/usr/sbin/arping2 -0 -c 1 -i "${iface}" "${address}" \
&>/dev/null && return 0
done
fi
return 1
}
# bool apipa_start(char *iface)
#
# Tries to locate an address in the 169.254.0.0 netmask 169.254.255.255 range
apipa_start() {
local iface="$1" i1 i2 addr i=0
interface_exists "${iface}" true || return 1
ebegin "Searching for free addresses"
interface_up "${iface}"
while [[ ${i} -lt 64516 ]]; do
(( i1=${RANDOM}%255 ))
(( i2=${RANDOM}%255 ))
addr="169.254.${i1}.${i2}"
if ! address_exists "${iface}" "${addr}" ; then
config[config_counter]="${addr}/16 broadcast 169.254.255.255"
(( config_counter-- ))
eend 0
return 0
fi
(( i++ ))
done
eend 1 "No free address found!"
return 1
}
# vim:ts=4
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