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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"
UDHCPD_CONF="no"
[ -f $UDHCPC_CONF ] && . $UDHCPC_CONF
export broadcast
export dns
export domain
export interface
export ip
export mask
export metric
export staticroutes
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 -4 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 -4 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) ))
}
route_add() {
local to=$1 gw=$2 num=$3
# special case for /32 subnets:
# /32 instructs kernel to always use routing for all outgoing packets
# (they can never be sent to local subnet - there is no local subnet for /32).
# Used in datacenters, avoids the need for private ip-addresses between two hops.
if [ "$subnet" = "255.255.255.255" ]; then
ip -4 route add $gw dev $interface
fi
ip -4 route add $to via $gw dev $interface \
metric $(( $num + ${IF_METRIC:-$(calc_metric)} ))
}
routes() {
[ -z "$router" ] && [ -z "$staticroutes" ] && return
for i in $NO_GATEWAY; do
[ "$i" = "$interface" ] && return
done
while ip -4 route del default via dev $interface 2>/dev/null; do
:
done
local num=0
# RFC3442:
# If the DHCP server returns both a Classless Static Routes option
# and a Router option, the DHCP client MUST ignore the Router option.
if [ -n "$staticroutes" ]; then
# static routes format: dest1/mask gw1 ... destn/mask gwn
set -- $staticroutes
while [ -n "$1" ] && [ -n "$2" ]; do
local dest="$1" gw="$2"
if [ "$gw" != "0.0.0.0" ]; then
route_add $dest $gw $num && num=$(( $num + 1))
fi
shift 2
done
else
local gw=
for gw in $router; do
route_add 0.0.0.0/0 $gw $num && num=$(( $num + 1 ))
done
fi
}
resolvconf() {
local i
if [ "$RESOLV_CONF" = "no" ] || [ "$RESOLV_CONF" = "NO" ] \
|| [ -z "$RESOLV_CONF" ] || [ -z "$dns" ]; then
return
fi
echo -n > "$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
chmod a+r "$RESOLV_CONF.$$"
mv -f "$RESOLV_CONF.$$" "$RESOLV_CONF"
}
udhcpd_conf() {
if [ "$UDHCPD_CONF" = "no" ] || [ "$UDHCPD_CONF" = "NO" ] \
|| [ -z "$UDHCPD_CONF" ]; then
return
fi
cat $UDHCPD_CONF_TEMPLATE \
| sed "s!%%DNS%%!$dns!" \
> $UDHCPD_CONF
chmod a+r "$UDHCPD_CONF"
service udhcpd --ifstarted restart
}
propagate_dns() {
local i
[ -n "$IF_PEER_DNS" ] && [ "$IF_PEER_DNS" != "yes" ] && return
for i in $NO_DNS; do
[ "$i" = "$interface" ] && return
done
resolvconf
udhcpd_conf
}
bound() {
ip -4 addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface
ip -4 link set dev $interface up
routes
propagate_dns
}
renew() {
if ! ip -4 addr show dev $interface | grep $ip/$mask; then
ip -4 addr flush dev $interface
ip -4 addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface
fi
local i
for i in $router; do
if ! ip -4 route show | grep ^default | grep $i; then
routes
break
fi
done
if ! grep "^search $domain"; then
propagate_dns
return
fi
for i in $dns; do
if ! grep "^nameserver $i"; then
propagate_dns
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
|
