#!/bin/sh # script for udhcpc # Copyright (c) 2008 Natanael Copa 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 -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 + $(if_index) )) } routes() { [ -z "$router" ] && return for i in $NO_GATEWAY; do [ "$i" = "$interface" ] && return done local gw= num= while ip -4 route del default via dev $interface 2>/dev/null; do : done num=0 for gw in $router; do ip -4 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 -4 addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface ip -4 link set dev $interface up routes resolvconf } 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 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