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139 lines
2.4 KiB
139 lines
2.4 KiB
#!/tmp/gns3/bin/sh
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# script for udhcpc
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# Copyright (c) 2008 Natanael Copa <natanael.copa@gmail.com>
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UDHCPC="/gns3/etc/udhcpc"
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UDHCPC_CONF="$UDHCPC/udhcpc.conf"
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RESOLV_CONF="/etc/resolv.conf"
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[ -f $UDHCPC_CONF ] && . $UDHCPC_CONF
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export broadcast
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export dns
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export domain
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export interface
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export ip
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export mask
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export metric
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export router
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export subnet
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#export PATH=/usr/bin:/bin:/usr/sbin:/sbin
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run_scripts() {
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local dir=$1
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if [ -d $dir ]; then
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for i in $dir/*; do
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[ -f $i ] && $i
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done
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fi
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}
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deconfig() {
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ip addr flush dev $interface
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}
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is_wifi() {
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test -e /sys/class/net/$interface/phy80211
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}
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if_index() {
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if [ -e /sys/class/net/$interface/ifindex ]; then
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cat /sys/class/net/$interface/ifindex
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else
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ip link show dev $interface | head -n1 | cut -d: -f1
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fi
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}
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calc_metric() {
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local base=
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if is_wifi; then
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base=300
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else
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base=200
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fi
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echo $(( $base + $(if_index) ))
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}
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routes() {
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[ -z "$router" ] && return
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local gw= num=
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while ip route del default via dev $interface 2>/dev/null; do
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:
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done
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num=0
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for gw in $router; do
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ip route add 0.0.0.0/0 via $gw dev $interface \
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metric $(( $num + ${IF_METRIC:-$(calc_metric)} ))
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num=$(( $num + 1 ))
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done
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}
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resolvconf() {
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local i
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[ -n "$IF_PEER_DNS" ] && [ "$IF_PEER_DNS" != "yes" ] && return
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if [ "$RESOLV_CONF" = "no" ] || [ "$RESOLV_CONF" = "NO" ] \
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|| [ -z "$RESOLV_CONF" ]; then
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return
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fi
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echo -n > "$RESOLV_CONF"
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[ -n "$domain" ] && echo "search $domain" >> "$RESOLV_CONF"
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for i in $dns; do
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echo "nameserver $i" >> "$RESOLV_CONF"
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done
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}
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bound() {
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ip addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface
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ip link set dev $interface up
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routes
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resolvconf
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}
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renew() {
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if ! ip addr show dev $interface | grep $ip/$mask; then
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ip addr flush dev $interface
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ip addr add $ip/$mask ${broadcast:+broadcast $broadcast} dev $interface
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fi
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local i
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for i in $router; do
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if ! ip route show | grep ^default | grep $i; then
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routes
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break
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fi
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done
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if ! grep "^search $domain"; then
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resolvconf
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return
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fi
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for i in $dns; do
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if ! grep "^nameserver $i"; then
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resolvconf
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return
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fi
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done
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}
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case "$1" in
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deconfig|renew|bound)
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run_scripts $UDHCPC/pre-$1
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$1
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run_scripts $UDHCPC/post-$1
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;;
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leasefail)
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echo "udhcpc failed to get a DHCP lease" >&2
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;;
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nak)
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echo "udhcpc received DHCP NAK" >&2
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;;
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*)
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echo "Error: this script should be called from udhcpc" >&2
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exit 1
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;;
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esac
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exit 0
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