# 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious
# of the $1 in its args.
-# 'ip' just looks too weird. /sbin/ip looks less weird.
+# 5. Script refresh in 2017. The aliasing code was too convoluted and needs
+# to go away. Migrated DHCPv4 script to ip command from iproute2 suite.
+# This is based on Debian script with some tweaks. ifconfig is no longer
+# used. Everything is done using ip tool from ip-route2.
+
+# 'ip' just looks too weird. Also, we now have unit-tests! Those unit-tests
+# overwirte this line to use a fake ip-echo tool. It's also convenient
+# if your system holds ip tool in a non-standard location.
ip=/sbin/ip
+# update /etc/resolv.conf based on received values
+# This updated version mostly follows Debian script by Andrew Pollock et al.
make_resolv_conf() {
- if [ x"$new_domain_name_servers" != x ]; then
- cat /dev/null > /etc/resolv.conf.dhclient
- chmod 644 /etc/resolv.conf.dhclient
- if [ x"$new_domain_search" != x ]; then
- echo search $new_domain_search >> /etc/resolv.conf.dhclient
- elif [ x"$new_domain_name" != x ]; then
- # Note that the DHCP 'Domain Name Option' is really just a domain
- # name, and that this practice of using the domain name option as
- # a search path is both nonstandard and deprecated.
- echo search $new_domain_name >> /etc/resolv.conf.dhclient
+ local new_resolv_conf
+
+ # DHCPv4
+ if [ -n "$new_domain_search" ] || [ -n "$new_domain_name" ] ||
+ [ -n "$new_domain_name_servers" ]; then
+ new_resolv_conf=/etc/resolv.conf.dhclient-new
+ rm -f $new_resolv_conf
+
+ if [ -n "$new_domain_name" ]; then
+ echo domain ${new_domain_name%% *} >>$new_resolv_conf
+ fi
+
+ if [ -n "$new_domain_search" ]; then
+ if [ -n "$new_domain_name" ]; then
+ domain_in_search_list=""
+ for domain in $new_domain_search; do
+ if [ "$domain" = "${new_domain_name}" ] ||
+ [ "$domain" = "${new_domain_name}." ]; then
+ domain_in_search_list="Yes"
+ fi
+ done
+ if [ -z "$domain_in_search_list" ]; then
+ new_domain_search="$new_domain_name $new_domain_search"
+ fi
+ fi
+ echo "search ${new_domain_search}" >> $new_resolv_conf
+ elif [ -n "$new_domain_name" ]; then
+ echo "search ${new_domain_name}" >> $new_resolv_conf
+ fi
+
+ if [ -n "$new_domain_name_servers" ]; then
+ for nameserver in $new_domain_name_servers; do
+ echo nameserver $nameserver >>$new_resolv_conf
+ done
+ else # keep 'old' nameservers
+ sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p /etc/resolv.conf >>$new_resolv_conf
+ fi
+
+ if [ -f /etc/resolv.conf ]; then
+ chown --reference=/etc/resolv.conf $new_resolv_conf
+ chmod --reference=/etc/resolv.conf $new_resolv_conf
+ fi
+ mv -f $new_resolv_conf /etc/resolv.conf
+ # DHCPv6
+ elif [ -n "$new_dhcp6_domain_search" ] || [ -n "$new_dhcp6_name_servers" ]; then
+ new_resolv_conf=/etc/resolv.conf.dhclient-new
+ rm -f $new_resolv_conf
+
+ if [ -n "$new_dhcp6_domain_search" ]; then
+ echo "search ${new_dhcp6_domain_search}" >> $new_resolv_conf
+ fi
+
+ if [ -n "$new_dhcp6_name_servers" ]; then
+ for nameserver in $new_dhcp6_name_servers; do
+ # append %interface to link-local-address nameservers
+ if [ "${nameserver##fe80::}" != "$nameserver" ] ||
+ [ "${nameserver##FE80::}" != "$nameserver" ]; then
+ nameserver="${nameserver}%${interface}"
+ fi
+ echo nameserver $nameserver >>$new_resolv_conf
+ done
+ else # keep 'old' nameservers
+ sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p /etc/resolv.conf >>$new_resolv_conf
+ fi
+
+ if [ -f /etc/resolv.conf ]; then
+ chown --reference=/etc/resolv.conf $new_resolv_conf
+ chmod --reference=/etc/resolv.conf $new_resolv_conf
+ fi
+ mv -f $new_resolv_conf /etc/resolv.conf
fi
- for nameserver in $new_domain_name_servers; do
- echo nameserver $nameserver >>/etc/resolv.conf.dhclient
- done
+}
- mv /etc/resolv.conf.dhclient /etc/resolv.conf
- elif [ "x${new_dhcp6_name_servers}" != x ] ; then
- cat /dev/null > /etc/resolv.conf.dhclient6
- chmod 644 /etc/resolv.conf.dhclient6
+# set host name
+set_hostname() {
+ local current_hostname
+
+ if [ -n "$new_host_name" ]; then
+ current_hostname=$(hostname)
+
+ # current host name is empty, '(none)' or 'localhost' or differs from new one from DHCP
+ if [ -z "$current_hostname" ] ||
+ [ "$current_hostname" = '(none)' ] ||
+ [ "$current_hostname" = 'localhost' ] ||
+ [ "$current_hostname" = "$old_host_name" ]; then
+ if [ "$new_host_name" != "$old_host_name" ]; then
+ hostname "$new_host_name"
+ fi
+ fi
+ fi
+}
+
+# run given script
+run_hook() {
+ local script
+ local exit_status
+ script="$1"
- if [ "x${new_dhcp6_domain_search}" != x ] ; then
- echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
+ if [ -f $script ]; then
+ . $script
fi
- shopt -s nocasematch
- for nameserver in ${new_dhcp6_name_servers} ; do
- # If the nameserver has a link-local address
- # add a <zone_id> (interface name) to it.
- if [[ "$nameserver" =~ ^fe80:: ]]
- then
- zone_id="%$interface"
- else
- zone_id=
- fi
- echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6
- done
- shopt -u nocasematch
-
- mv /etc/resolv.conf.dhclient6 /etc/resolv.conf
- fi
+
+ if [ -n "$exit_status" ] && [ "$exit_status" -ne 0 ]; then
+ logger -p daemon.err "$script returned non-zero exit status $exit_status"
+ fi
+
+ return $exit_status
+}
+
+# run scripts in given directory
+run_hookdir() {
+ local dir
+ local exit_status
+ dir="$1"
+
+ if [ -d "$dir" ]; then
+ for script in $(run-parts --list $dir); do
+ run_hook $script || true
+ exit_status=$?
+ done
+ fi
+
+ return $exit_status
}
# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
- exit_status=$1
- if [ -f /etc/dhclient-exit-hooks ]; then
- . /etc/dhclient-exit-hooks
- fi
-# probably should do something with exit status of the local script
- exit $exit_status
-}
+ exit_status=$1
-# Invoke the local dhcp client enter hooks, if they exist.
-if [ -f /etc/dhclient-enter-hooks ]; then
- exit_status=0
- . /etc/dhclient-enter-hooks
- # allow the local script to abort processing of this state
- # local script must set exit_status variable to nonzero.
- if [ $exit_status -ne 0 ]; then
- exit $exit_status
- fi
-fi
-
-###
-### DHCPv4 Handlers
-###
-
-if [ x$new_broadcast_address != x ]; then
- new_broadcast_arg="broadcast $new_broadcast_address"
-fi
-if [ x$old_broadcast_address != x ]; then
- old_broadcast_arg="broadcast $old_broadcast_address"
-fi
-if [ x$new_subnet_mask != x ]; then
- new_subnet_arg="netmask $new_subnet_mask"
-fi
-if [ x$old_subnet_mask != x ]; then
- old_subnet_arg="netmask $old_subnet_mask"
-fi
-if [ x$alias_subnet_mask != x ]; then
- alias_subnet_arg="netmask $alias_subnet_mask"
-fi
-if [ x$new_interface_mtu != x ]; then
- mtu_arg="mtu $new_interface_mtu"
-fi
-if [ x$IF_METRIC != x ]; then
- metric_arg="metric $IF_METRIC"
-fi
-
-if [ x$reason = xMEDIUM ]; then
- # Linux doesn't do mediums (ok, ok, media).
- exit_with_hooks 0
-fi
-
-if [ x$reason = xPREINIT ]; then
- if [ x$alias_ip_address != x ]; then
- # Bring down alias interface. Its routes will disappear too.
- ifconfig $interface:0- inet 0
- fi
- ifconfig $interface 0 up
-
- # We need to give the kernel some time to get the interface up.
- sleep 1
-
- exit_with_hooks 0
-fi
-
-if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
- exit_with_hooks 0
-fi
-
-if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
- [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
- current_hostname=`hostname`
- if [ x$current_hostname = x ] || \
- [ x$current_hostname = "x(none)" ] || \
- [ x$current_hostname = xlocalhost ] || \
- [ x$current_hostname = x$old_host_name ]; then
- if [ x$new_host_name != x$old_host_name ]; then
- hostname "$new_host_name"
+ # Source the documented exit-hook script, if it exists
+ if ! run_hook /etc/dhclient-exit-hooks; then
+ exit_status=$?
fi
- fi
-
- if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
- [ x$alias_ip_address != x$old_ip_address ]; then
- # Possible new alias. Remove old alias.
- ifconfig $interface:0- inet 0
- fi
- if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
- # IP address changed. Bringing down the interface will delete all routes,
- # and clear the ARP cache.
- ifconfig $interface inet 0 down
-
- fi
- if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
- [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
-
- ifconfig $interface inet $new_ip_address $new_subnet_arg \
- $new_broadcast_arg $mtu_arg
- # Add a network route to the computed network address.
- for router in $new_routers; do
- if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
- route add -host $router dev $interface
- fi
- route add default gw $router $metric_arg dev $interface
- done
- else
- # we haven't changed the address, have we changed other options
- # that we wish to update?
- if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then
- # if we've changed routers delete the old and add the new.
- for router in $old_routers; do
- route del default gw $router
- done
- for router in $new_routers; do
- if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
- route add -host $router dev $interface
- fi
- route add default gw $router $metric_arg dev $interface
- done
- fi
- fi
- if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
- then
- ifconfig $interface:0- inet 0
- ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
- route add -host $alias_ip_address $interface:0
- fi
- make_resolv_conf
- exit_with_hooks 0
-fi
-
-if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
- || [ x$reason = xSTOP ]; then
- if [ x$alias_ip_address != x ]; then
- # Turn off alias interface.
- ifconfig $interface:0- inet 0
- fi
- if [ x$old_ip_address != x ]; then
- # Shut down interface, which will delete routes and clear arp cache.
- ifconfig $interface inet 0 down
- fi
- if [ x$alias_ip_address != x ]; then
- ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
- route add -host $alias_ip_address $interface:0
- fi
- exit_with_hooks 0
-fi
-
-if [ x$reason = xTIMEOUT ]; then
- if [ x$alias_ip_address != x ]; then
- ifconfig $interface:0- inet 0
- fi
- ifconfig $interface inet $new_ip_address $new_subnet_arg \
- $new_broadcast_arg $mtu_arg
- set $new_routers
- if ping -q -c 1 $1; then
- if [ x$new_ip_address != x$alias_ip_address ] && \
- [ x$alias_ip_address != x ]; then
- ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
- route add -host $alias_ip_address dev $interface:0
+
+ # Now run scripts in the Debian-specific directory.
+ if ! run_hookdir /etc/dhclient-exit-hooks.d; then
+ exit_status=$?
fi
- for router in $new_routers; do
- if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
- route add -host $router dev $interface
- fi
- route add default gw $router $metric_arg dev $interface
- done
- make_resolv_conf
- exit_with_hooks 0
- fi
- ifconfig $interface inet 0 down
- exit_with_hooks 1
-fi
-
-###
-### DHCPv6 Handlers
-###
-
-if [ x$reason = xPREINIT6 ] ; then
- # Ensure interface is up.
- ${ip} link set ${interface} up
-
- # We need to give the kernel some time to active interface
- interface_up_wait_time=5
- for i in $(seq 0 ${interface_up_wait_time})
- do
- ifconfig ${interface} | grep RUNNING >/dev/null 2>&1
- if [ $? -eq 0 ]; then
- break;
- fi
- sleep 1
- done
-
- # Remove any stale addresses from aborted clients.
- ${ip} -f inet6 addr flush dev ${interface} scope global permanent
-
- # Wait for duplicate address detection for this interface if the
- # --dad-wait-time parameter has been specified and is greater than
- # zero.
- if [ ${dad_wait_time} -gt 0 ]; then
- # Check if any IPv6 address on this interface is marked as
- # tentative.
- ${ip} addr show ${interface} | grep inet6 | grep tentative \
- &> /dev/null
- if [ $? -eq 0 ]; then
- # Wait for duplicate address detection to complete or for
- # the timeout specified as --dad-wait-time.
- for i in $(seq 0 $dad_wait_time)
- do
- # We're going to poll for the tentative flag every second.
- sleep 1
- ${ip} addr show ${interface} | grep inet6 | grep tentative \
- &> /dev/null
- if [ $? -ne 0 ]; then
- break;
- fi
- done
- fi
- fi
-
- exit_with_hooks 0
-fi
-
-if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
- echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
-
- exit_with_hooks 0
-fi
-
-if [ x$reason = xBOUND6 ] ; then
- if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
- exit_with_hooks 2;
- fi
-
- ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
- dev ${interface} scope global
-
- # Check for nameserver options.
- make_resolv_conf
-
- exit_with_hooks 0
-fi
-
-if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ] ; then
- if [ x${new_ip6_address} != x ] && [ x${new_ip6_prefixlen} != x ] ; then
- ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
- dev ${interface} scope global
- fi
-
- # Make sure nothing has moved around on us.
-
- # Nameservers/domains/etc.
- if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
- [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
- make_resolv_conf
- fi
-
- exit_with_hooks 0
-fi
-
-if [ x$reason = xDEPREF6 ] ; then
- if [ x${new_ip6_prefixlen} = x ] ; then
- exit_with_hooks 2;
- fi
-
- ${ip} -f inet6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \
- dev ${interface} scope global preferred_lft 0
-
- exit_with_hooks 0
-fi
-
-if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ] ; then
- if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
- exit_with_hooks 2;
- fi
-
- ${ip} -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
- dev ${interface}
-
- exit_with_hooks 0
-fi
+
+ exit $exit_status
+}
+
+
+# Invoke the local dhcp client enter hooks, if they exist.
+run_hook /etc/dhclient-enter-hooks
+run_hookdir /etc/dhclient-enter-hooks.d
+
+# Execute the operation
+case "$reason" in
+
+ ### DHCPv4 Handlers
+
+ MEDIUM|ARPCHECK|ARPSEND)
+ # Do nothing
+ ;;
+ PREINIT)
+ # The DHCP client is requesting that an interface be
+ # configured as required in order to send packets prior to
+ # receiving an actual address. - dhclient-script(8)
+
+ # ensure interface is up
+ ${ip} link set dev ${interface} up
+
+ if [ -n "$alias_ip_address" ]; then
+ # flush alias IP from interface
+ ${ip} -4 addr flush dev ${interface} label ${interface}:0
+ fi
+
+ ;;
+
+ BOUND|RENEW|REBIND|REBOOT)
+ set_hostname
+
+ if [ -n "$old_ip_address" ] && [ -n "$alias_ip_address" ] &&
+ [ "$alias_ip_address" != "$old_ip_address" ]; then
+ # alias IP may have changed => flush it
+ ${ip} -4 addr flush dev ${interface} label ${interface}:0
+ fi
+
+ if [ -n "$old_ip_address" ] &&
+ [ "$old_ip_address" != "$new_ip_address" ]; then
+ # leased IP has changed => flush it
+ ${ip} -4 addr flush dev ${interface} label ${interface}
+ fi
+
+ if [ -z "$old_ip_address" ] ||
+ [ "$old_ip_address" != "$new_ip_address" ] ||
+ [ "$reason" = "BOUND" ] || [ "$reason" = "REBOOT" ]; then
+ # new IP has been leased or leased IP changed => set it
+ ${ip} -4 addr add ${new_ip_address}${new_subnet_mask:+/$new_subnet_mask} \
+ ${new_broadcast_address:+broadcast $new_broadcast_address} \
+ dev ${interface} label ${interface}
+
+ if [ -n "$new_interface_mtu" ]; then
+ # set MTU
+ ${ip} link set dev ${interface} mtu ${new_interface_mtu}
+ fi
+
+ # if we have $new_rfc3442_classless_static_routes then we have to
+ # ignore $new_routers entirely
+ if [ ! "$new_rfc3442_classless_static_routes" ]; then
+ # set if_metric if IF_METRIC is set or there's more than one router
+ if_metric="$IF_METRIC"
+ if [ "${new_routers%% *}" != "${new_routers}" ]; then
+ if_metric=${if_metric:-1}
+ fi
+
+ for router in $new_routers; do
+ if [ "$new_subnet_mask" = "255.255.255.255" ]; then
+ # point-to-point connection => set explicit route
+ ${ip} -4 route add ${router} dev $interface >/dev/null 2>&1
+ fi
+
+ # set default route
+ ${ip} -4 route add default via ${router} dev ${interface} \
+ ${if_metric:+metric $if_metric} >/dev/null 2>&1
+
+ if [ -n "$if_metric" ]; then
+ if_metric=$((if_metric+1))
+ fi
+ done
+ fi
+ fi
+
+ if [ -n "$alias_ip_address" ] &&
+ [ "$new_ip_address" != "$alias_ip_address" ]; then
+ # separate alias IP given, which may have changed
+ # => flush it, set it & add host route to it
+ ${ip} -4 addr flush dev ${interface} label ${interface}:0
+ ${ip} -4 addr add ${alias_ip_address}${alias_subnet_mask:+/$alias_subnet_mask} \
+ dev ${interface} label ${interface}:0
+ ${ip} -4 route add ${alias_ip_address} dev ${interface} >/dev/null 2>&1
+ fi
+
+ # update /etc/resolv.conf
+ make_resolv_conf
+
+ ;;
+
+ EXPIRE|FAIL|RELEASE|STOP)
+ if [ -n "$alias_ip_address" ]; then
+ # flush alias IP
+ ${ip} -4 addr flush dev ${interface} label ${interface}:0
+ fi
+
+ if [ -n "$old_ip_address" ]; then
+ # flush leased IP
+ ${ip} -4 addr flush dev ${interface} label ${interface}
+ fi
+
+ if [ -n "$alias_ip_address" ]; then
+ # alias IP given => set it & add host route to it
+ ${ip} -4 addr add ${alias_ip_address}${alias_subnet_mask:+/$alias_subnet_mask} \
+ dev ${interface} label ${interface}:0
+ ${ip} -4 route add ${alias_ip_address} dev ${interface} >/dev/null 2>&1
+ fi
+
+ ;;
+
+ TIMEOUT)
+ if [ -n "$alias_ip_address" ]; then
+ # flush alias IP
+ ${ip} -4 addr flush dev ${interface} label ${interface}:0
+ fi
+
+ # set IP from recorded lease
+ ${ip} -4 addr add ${new_ip_address}${new_subnet_mask:+/$new_subnet_mask} \
+ ${new_broadcast_address:+broadcast $new_broadcast_address} \
+ dev ${interface} label ${interface}
+
+ if [ -n "$new_interface_mtu" ]; then
+ # set MTU
+ ${ip} link set dev ${interface} mtu ${new_interface_mtu}
+ fi
+
+ # if there is no router recorded in the lease or the 1st router answers pings
+ if [ -z "$new_routers" ] || ping -q -c 1 "${new_routers%% *}"; then
+ # if we have $new_rfc3442_classless_static_routes then we have to
+ # ignore $new_routers entirely
+ if [ ! "$new_rfc3442_classless_static_routes" ]; then
+ if [ -n "$alias_ip_address" ] &&
+ [ "$new_ip_address" != "$alias_ip_address" ]; then
+ # separate alias IP given => set up the alias IP & add host route to it
+ ${ip} -4 addr add \
+ ${alias_ip_address}${alias_subnet_mask:+/$alias_subnet_mask} \
+ dev ${interface} label ${interface}:0
+ ${ip} -4 route add ${alias_ip_address} dev ${interface} >/dev/null 2>&1
+ fi
+
+ # set if_metric if IF_METRIC is set or there's more than one router
+ if_metric="$IF_METRIC"
+ if [ "${new_routers%% *}" != "${new_routers}" ]; then
+ if_metric=${if_metric:-1}
+ fi
+
+ # set default route
+ for router in $new_routers; do
+ ${ip} -4 route add default via ${router} dev ${interface} \
+ ${if_metric:+metric $if_metric} >/dev/null 2>&1
+
+ if [ -n "$if_metric" ]; then
+ if_metric=$((if_metric+1))
+ fi
+ done
+ fi
+
+ # update /etc/resolv.conf
+ make_resolv_conf
+ else
+ # flush all IPs from interface
+ ip -4 addr flush dev ${interface}
+ exit_with_hooks 2
+ fi
+
+ ;;
+
+ ### DHCPv6 Handlers
+ # TODO handle prefix change: ?based on ${old_ip6_prefix} and ${new_ip6_prefix}?
+
+ PREINIT6)
+ # ensure interface is up
+ ${ip} link set ${interface} up
+
+ # We need to give the kernel some time to active interface
+ interface_up_wait_time=5
+ for i in $(seq 0 ${interface_up_wait_time})
+ do
+ ifconfig ${interface} | grep RUNNING >/dev/null 2>&1
+ if [ $? -eq 0 ]; then
+ break;
+ fi
+ sleep 1
+ done
+
+ # flush any stale global permanent IPs from interface
+ ${ip} -6 addr flush dev ${interface} scope global permanent
+
+ # Wait for duplicate address detection for this interface if the
+ # --dad-wait-time parameter has been specified and is greater than
+ # zero.
+ if [ ${dad_wait_time} -gt 0 ]; then
+ # Check if any IPv6 address on this interface is marked as
+ # tentative.
+ ${ip} addr show ${interface} | grep inet6 | grep tentative \
+ &> /dev/null
+ if [ $? -eq 0 ]; then
+ # Wait for duplicate address detection to complete or for
+ # the timeout specified as --dad-wait-time.
+ for i in $(seq 0 $dad_wait_time)
+ do
+ # We're going to poll for the tentative flag every second.
+ sleep 1
+ ${ip} addr show ${interface} | grep inet6 | grep tentative \
+ &> /dev/null
+ if [ $? -ne 0 ]; then
+ break;
+ fi
+ done
+ fi
+ fi
+
+ ;;
+
+ BOUND6|RENEW6|REBIND6)
+ if [ "${new_ip6_address}" ] && [ "${new_ip6_prefixlen}" ]; then
+ # set leased IP
+ ${ip} -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
+ dev ${interface} scope global
+ fi
+
+ # update /etc/resolv.conf
+ if [ "${reason}" = BOUND6 ] ||
+ [ "${new_dhcp6_name_servers}" != "${old_dhcp6_name_servers}" ] ||
+ [ "${new_dhcp6_domain_search}" != "${old_dhcp6_domain_search}" ]; then
+ make_resolv_conf
+ fi
+
+ ;;
+
+ DEPREF6)
+ if [ -z "${cur_ip6_prefixlen}" ]; then
+ exit_with_hooks 2
+ fi
+
+ # set preferred lifetime of leased IP to 0
+ ${ip} -6 addr change ${cur_ip6_address}/${cur_ip6_prefixlen} \
+ dev ${interface} scope global preferred_lft 0
+
+ ;;
+
+ EXPIRE6|RELEASE6|STOP6)
+ if [ -z "${old_ip6_address}" ] || [ -z "${old_ip6_prefixlen}" ]; then
+ exit_with_hooks 2
+ fi
+
+ # delete leased IP
+ ${ip} -6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
+ dev ${interface}
+
+ ;;
+esac
exit_with_hooks 0
projects / thirdparty / dhcp.git / commitdiff
