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|
#!/bin/sh
# script for udhcpc
# Copyright (c) 2008 Natanael Copa <natanael.copa@gmail.com>
UDHCPC="/etc/udhcpc"
UDHCPC_CONF="$UDHCPC/udhcpc.conf"
RESOLV_CONF="/etc/resolv.conf"
[ -f $UDHCPC_CONF ] && . $UDHCPC_CONF
export broadcast
export dns
export domain
export interface
export ip
export mask
export metric
export router
export subnet
export PATH=/usr/bin:/bin:/usr/sbin:/sbin
run_scripts() {
local dir=$1
if [ -d $dir ]; then
for i in $dir/*; do
[ -f $i ] && $i
done
fi
}
deconfig() {
ip addr flush dev $interface
}
is_wifi() {
test -e /sys/class/net/$interface/phy80211
}
if_index() {
if [ -e /sys/class/net/$interface/ifindex ]; then
cat /sys/class/net/$interface/ifindex
else
ip link show dev $interface | head -n1 | cut -d: -f1
fi
}
calc_metric() {
local base=
if is_wifi; then
base=300
else
base=200
fi
echo $(( $base + $(if_index) ))
}
routes() {
[ -z "$router" ] && return
for i in $NO_GATEWAY; do
[ "$i" = "$interface" ] && return
done
local gw= num=
while ip route del default via dev $interface 2>/dev/null; do
:
done
num=0
for gw in $router; do
ip route add 0.0.0.0/0 via $gw dev $interface \
metric $(( $num + ${IF_METRIC:-$(calc_metric)} ))
num=$(( $num + 1 ))
done
}
resolvconf() {
local i
[ -n "$IF_PEER_DNS" ] && [ "$IF_PEER_DNS" != "yes" ] && return
if [ "$RESOLV_CONF" = "no" ] || [ "$RESOLV_CONF" = "NO" ] \
|| [ -z "$RESOLV_CONF" ]; then
return
fi
for i in $NO_DNS; do
[ "$i" = "$interface" ] && return
done
echo -n > "$RESOLV_CONF.$$"
if [ -n "$search" ]; then
echo "search $search" >> "$RESOLV_CONF.$$"
elif [ -n "$domain" ]; then
echo "search $domain" >> "$RESOLV_CONF.$$"
fi
for i in $dns; do
echo "nameserver $i" >> "$RESOLV_CONF.$$"
done
mv "$RESOLV_CONF.$$" "$RESOLV_CONF"
}
bound() {
ip addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface
ip link set dev $interface up
routes
resolvconf
}
renew() {
if ! ip addr show dev $interface | grep $ip/$mask; then
ip addr flush dev $interface
ip addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface
fi
local i
for i in $router; do
if ! ip route show | grep ^default | grep $i; then
routes
break
fi
done
if ! grep "^search $domain"; then
resolvconf
return
fi
for i in $dns; do
if ! grep "^nameserver $i"; then
resolvconf
return
fi
done
}
case "$1" in
deconfig|renew|bound)
run_scripts $UDHCPC/pre-$1
$1
run_scripts $UDHCPC/post-$1
;;
leasefail)
echo "udhcpc failed to get a DHCP lease" >&2
;;
nak)
echo "udhcpc received DHCP NAK" >&2
;;
*)
echo "Error: this script should be called from udhcpc" >&2
exit 1
;;
esac
exit 0
|
