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#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org
START=60
dhcp_calc() {
local ip="$1"
local res=0
while [ -n "$ip" ]; do
part="${ip%%.*}"
res="$(($res * 256))"
res="$(($res + $part))"
[ "${ip%.*}" != "$ip" ] && ip="${ip#*.}" || ip=
done
echo "$res"
}
dhcp_add() {
local cfg="$1"
config_get net "$cfg" interface
[ -n "$net" ] || return 0
config_get ifname "$net" ifname
[ -n "$ifname" ] || return 0
config_get_bool ignore "$cfg" ignore
[ "$ignore" -gt 0 ] && {
append args "-I $ifname"
return 0
}
config_get proto "$net" proto
[ static = "$proto" ] || return 0
config_get ipaddr "$net" ipaddr
config_get netmask "$net" netmask
# check for an already active dhcp server on the interface, unless 'force' is set
config_get_bool force "$cfg" force 0
[ "$force" -gt 0 ] || {
udhcpc -n -q -R -s /bin/true -i $ifname >&- && return 0
}
config_get start "$cfg" start
config_get end "$cfg" end
config_get leasetime "$cfg" leasetime
config_get options "$cfg" options
leasetime="${leasetime:-12h}"
start="$(dhcp_calc "${start:-100}")"
end="$((${end:-150} + 1))"
eval "$(ipcalc.sh $ipaddr $netmask $start $end)"
append args "-F $START,$END,$NETMASK,$leasetime${options:+ $options}"
}
start() {
include /lib/network
scan_interfaces
config_load dhcp
args=""
config_foreach dhcp_add dhcp
dnsmasq $args && {
rm -f /tmp/resolv.conf
cat > /tmp/resolv.conf <<EOF
nameserver 127.0.0.1
search lan
EOF
}
}
stop() {
killall dnsmasq
}
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