f79a420825
RFC3442 specifies a DHCP extension to provide the client with a list of static routes to use. This is already handled by udhcpc and exposed as the "staticroutes" environment variable, but currently not handled by the action script. Extend the script to do so. The RFC specifies that if this option is provided by the server then the normal "routes" (3) option should be ignored, so ensure that is done. As we may now have more than just a default route on the interface, extend the route cleanup logic to handle all routes for the interface (except for the implied local 0.0.0.0 one). Notice that this option is only sent by servers if explicitly requested by the client, E.G. using the -O staticroutes option to udhcpc. Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
122 lines
3 KiB
Bash
Executable file
122 lines
3 KiB
Bash
Executable file
#!/bin/sh
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# udhcpc script edited by Tim Riker <Tim@Rikers.org>
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[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
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RESOLV_CONF="/etc/resolv.conf"
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[ -e $RESOLV_CONF ] || touch $RESOLV_CONF
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[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
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[ -n "$subnet" ] && NETMASK="netmask $subnet"
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# Handle stateful DHCPv6 like DHCPv4
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[ -n "$ipv6" ] && ip="$ipv6/128"
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if [ -z "${IF_WAIT_DELAY}" ]; then
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IF_WAIT_DELAY=10
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fi
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wait_for_ipv6_default_route() {
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printf "Waiting for IPv6 default route to appear"
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while [ $IF_WAIT_DELAY -gt 0 ]; do
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if [ -z "$(ip -6 route list | grep default)" ]; then
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printf "\n"
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return
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fi
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sleep 1
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printf "."
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: $((IF_WAIT_DELAY -= 1))
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done
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printf " timeout!\n"
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}
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case "$1" in
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deconfig)
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/sbin/ifconfig $interface up
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/sbin/ifconfig $interface 0.0.0.0
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# drop info from this interface
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# resolv.conf may be a symlink to /tmp/, so take care
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TMPFILE=$(mktemp)
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grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE
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cat $TMPFILE > $RESOLV_CONF
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rm -f $TMPFILE
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if [ -x /usr/sbin/avahi-autoipd ]; then
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/usr/sbin/avahi-autoipd -c $interface && /usr/sbin/avahi-autoipd -k $interface
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fi
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;;
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leasefail|nak)
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if [ -x /usr/sbin/avahi-autoipd ]; then
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/usr/sbin/avahi-autoipd -c $interface || /usr/sbin/avahi-autoipd -wD $interface --no-chroot
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fi
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;;
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renew|bound)
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if [ -x /usr/sbin/avahi-autoipd ]; then
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/usr/sbin/avahi-autoipd -c $interface && /usr/sbin/avahi-autoipd -k $interface
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fi
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/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
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if [ -n "$ipv6" ] ; then
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wait_for_ipv6_default_route
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fi
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# RFC3442: If the DHCP server returns both a Classless
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# Static Routes option and a Router option, the DHCP
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# client MUST ignore the Router option.
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if [ -n "$staticroutes" ]; then
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echo "deleting routers"
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route -n | while read dest gw mask flags metric ref use iface; do
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[ "$iface" != "$interface" -o "$gw" = "0.0.0.0" ] || \
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route del -net "$dest" netmask "$mask" gw "$gw" dev "$interface"
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done
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# format: dest1/mask gw1 ... destn/mask gwn
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set -- $staticroutes
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while [ -n "$1" -a -n "$2" ]; do
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route add -net "$1" gw "$2" dev "$interface"
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shift 2
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done
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elif [ -n "$router" ] ; then
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echo "deleting routers"
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while route del default gw 0.0.0.0 dev $interface 2> /dev/null; do
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:
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done
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for i in $router ; do
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route add default gw $i dev $interface
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done
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fi
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# drop info from this interface
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# resolv.conf may be a symlink to /tmp/, so take care
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TMPFILE=$(mktemp)
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grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE
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cat $TMPFILE > $RESOLV_CONF
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rm -f $TMPFILE
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# prefer rfc3397 domain search list (option 119) if available
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if [ -n "$search" ]; then
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search_list=$search
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elif [ -n "$domain" ]; then
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search_list=$domain
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fi
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[ -n "$search_list" ] &&
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echo "search $search_list # $interface" >> $RESOLV_CONF
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for i in $dns ; do
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echo adding dns $i
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echo "nameserver $i # $interface" >> $RESOLV_CONF
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done
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;;
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esac
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HOOK_DIR="$0.d"
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for hook in "${HOOK_DIR}/"*; do
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[ -f "${hook}" -a -x "${hook}" ] || continue
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"${hook}" "${@}"
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done
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exit 0
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