diff options
Diffstat (limited to 'release/picobsd/floppy.tree/sbin/dhclient-script')
| -rwxr-xr-x | release/picobsd/floppy.tree/sbin/dhclient-script | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/release/picobsd/floppy.tree/sbin/dhclient-script b/release/picobsd/floppy.tree/sbin/dhclient-script new file mode 100755 index 0000000..c457bf4 --- /dev/null +++ b/release/picobsd/floppy.tree/sbin/dhclient-script @@ -0,0 +1,384 @@ +#!/bin/sh +# +# $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $ +# $FreeBSD$ +# +# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org> +# +# Permission to use, copy, modify, and distribute this software for any +# purpose with or without fee is hereby granted, provided that the above +# copyright notice and this permission notice appear in all copies. +# +# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +# +# + +ARP=/usr/sbin/arp +HOSTNAME=/bin/hostname +IFCONFIG='/sbin/ifconfig -n' + +LOCALHOST=127.0.0.1 + +if [ -x /usr/bin/logger ]; then + LOGGER="/usr/bin/logger -s -p user.notice -t dhclient" +else + LOGGER=echo +fi + +# +# Helper functions that implement common actions. +# + +check_hostname() { + current_hostname=`$HOSTNAME` + if [ -z "$current_hostname" ]; then + $LOGGER "New Hostname ($interface): $new_host_name" + $HOSTNAME $new_host_name + elif [ "$current_hostname" = "$old_host_name" -a \ + "$new_host_name" != "$old_host_name" ]; then + $LOGGER "New Hostname ($interface): $new_host_name" + $HOSTNAME $new_host_name + fi +} + +arp_flush() { + arp -an -i $interface | \ + sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \ + sh >/dev/null 2>&1 +} + +delete_old_address() { + eval "$IFCONFIG $interface inet -alias $old_ip_address $medium" +} + +add_new_address() { + eval "$IFCONFIG $interface \ + inet $new_ip_address \ + netmask $new_subnet_mask \ + broadcast $new_broadcast_address \ + $medium" + + $LOGGER "New IP Address ($interface): $new_ip_address" + $LOGGER "New Subnet Mask ($interface): $new_subnet_mask" + $LOGGER "New Broadcast Address ($interface): $new_broadcast_address" + $LOGGER "New Routers ($interface): $new_routers" +} + +delete_old_alias() { + if [ -n "$alias_ip_address" ]; then + $IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1 + #route delete $alias_ip_address $LOCALHOST > /dev/null 2>&1 + fi +} + +add_new_alias() { + if [ -n "$alias_ip_address" ]; then + $IFCONFIG $interface inet alias $alias_ip_address netmask \ + $alias_subnet_mask + #route add $alias_ip_address $LOCALHOST + fi +} + +fill_classless_routes() { + set $1 + while [ $# -ge 5 ]; do + if [ $1 -eq 0 ]; then + route="default" + elif [ $1 -le 8 ]; then + route="$2.0.0.0/$1" + shift + elif [ $1 -le 16 ]; then + route="$2.$3.0.0/$1" + shift; shift + elif [ $1 -le 24 ]; then + route="$2.$3.$4.0/$1" + shift; shift; shift + else + route="$2.$3.$4.$5/$1" + shift; shift; shift; shift + fi + shift + router="$1.$2.$3.$4" + classless_routes="$classless_routes $route $router" + shift; shift; shift; shift + done +} + +delete_old_routes() { + #route delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1 + if [ -n "$old_classless_routes" ]; then + fill_classless_routes "$old_classless_routes" + set $classless_routes + while [ $# -gt 1 ]; do + route delete "$1" "$2" + shift; shift + done + return 0; + fi + + # If we supported multiple default routes, we'd be removing each + # one here. We don't so just delete the default route if it's + # through our interface. + if is_default_interface; then + route delete default >/dev/null 2>&1 + fi + + if [ -n "$old_static_routes" ]; then + set $old_static_routes + while [ $# -gt 1 ]; do + route delete "$1" "$2" + shift; shift + done + fi + + arp_flush +} + +add_new_routes() { + #route add $new_ip_address $LOCALHOST >/dev/null 2>&1 + + # RFC 3442: If the DHCP server returns both a Classless Static + # Routes option and a Router option, the DHCP client MUST ignore + # the Router option. + # + # DHCP clients that support this option (Classless Static Routes) + # MUST NOT install the routes specified in the Static Routes + # option (option code 33) if both a Static Routes option and the + # Classless Static Routes option are provided. + + if [ -n "$new_classless_routes" ]; then + fill_classless_routes "$new_classless_routes" + $LOGGER "New Classless Static Routes ($interface): $classless_routes" + set $classless_routes + while [ $# -gt 1 ]; do + if [ "0.0.0.0" = "$2" ]; then + route add "$1" -iface "$interface" + else + route add "$1" "$2" + fi + shift; shift + done + return + fi + + for router in $new_routers; do + if is_default_interface; then + + if [ "$new_ip_address" = "$router" ]; then + route add default -iface $router >/dev/null 2>&1 + else + route add default $router >/dev/null 2>&1 + fi + fi + # 2nd and subsequent default routers error out, so explicitly + # stop processing the list after the first one. + break + done + + if [ -n "$new_static_routes" ]; then + $LOGGER "New Static Routes ($interface): $new_static_routes" + set $new_static_routes + while [ $# -gt 1 ]; do + route add $1 $2 + shift; shift + done + fi +} + +add_new_resolv_conf() { + # XXX Old code did not create/update resolv.conf unless both + # $new_domain_name and $new_domain_name_servers were provided. PR + # #3135 reported some ISP's only provide $new_domain_name_servers and + # thus broke the script. This code creates the resolv.conf if either + # are provided. + + local tmpres=/var/run/resolv.conf.${interface} + rm -f $tmpres + + if [ -n "$new_domain_name" ]; then + echo "search $new_domain_name" >>$tmpres + fi + + if [ -n "$new_domain_name_servers" ]; then + for nameserver in $new_domain_name_servers; do + echo "nameserver $nameserver" >>$tmpres + done + fi + + if [ -f $tmpres ]; then + if [ -f /etc/resolv.conf.tail ]; then + cat /etc/resolv.conf.tail >>$tmpres + fi + + # When resolv.conf is not changed actually, we don't + # need to update it. + # If /usr is not mounted yet, we cannot use cmp, then + # the following test fails. In such case, we simply + # ignore an error and do update resolv.conf. + if cmp -s $tmpres /etc/resolv.conf; then + rm -f $tmpres + return 0 + fi 2>/dev/null + + # In case (e.g. during OpenBSD installs) /etc/resolv.conf + # is a symbolic link, take care to preserve the link and write + # the new data in the correct location. + + if [ -f /etc/resolv.conf ]; then + cat /etc/resolv.conf > /etc/resolv.conf.save + fi + cat $tmpres > /etc/resolv.conf + rm -f $tmpres + + # Try to ensure correct ownership and permissions. + chown -RL root:wheel /etc/resolv.conf + chmod -RL 644 /etc/resolv.conf + + return 0 + fi + + return 1 +} + +# 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 $exit_status +} + +# Get the interface with the current ipv4 default route on it using only +# commands that are available prior to /usr being mounted. +is_default_interface() +{ + routeget="`route -n get -inet default`" + oldifs="$IFS" + IFS=" +" + defif= + for line in $routeget ; do + case $line in + *interface:*) + defif=${line##*: } + ;; + esac + done + IFS=${oldifs} + + if [ -z "$defif" -o "$defif" = "$interface" ]; then + return 0 + else + return 1 + fi +} + +# +# Start of active code. +# + +# 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 + +case $reason in +MEDIUM) + eval "$IFCONFIG $interface $medium" + eval "$IFCONFIG $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1 + sleep 1 + ;; + +PREINIT) + delete_old_alias + $IFCONFIG $interface inet alias 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up + ;; + +ARPCHECK|ARPSEND) + ;; + +BOUND|RENEW|REBIND|REBOOT) + check_hostname + if [ -n "$old_ip_address" ]; then + if [ "$old_ip_address" != "$alias_ip_address" ]; then + delete_old_alias + fi + if [ "$old_ip_address" != "$new_ip_address" ]; then + delete_old_address + delete_old_routes + fi + fi + if [ "$reason" = BOUND ] || \ + [ "$reason" = REBOOT ] || \ + [ -z "$old_ip_address" ] || \ + [ "$old_ip_address" != "$new_ip_address" ]; then + add_new_address + add_new_routes + fi + if [ "$new_ip_address" != "$alias_ip_address" ]; then + add_new_alias + fi + if is_default_interface; then + add_new_resolv_conf + fi + ;; + +EXPIRE|FAIL) + delete_old_alias + if [ -n "$old_ip_address" ]; then + delete_old_address + delete_old_routes + fi + if [ -x $ARP ]; then + $ARP -d -a -i $interface + fi + # XXX Why add alias we just deleted above? + add_new_alias + if is_default_interface; then + if [ -f /etc/resolv.conf.save ]; then + cat /etc/resolv.conf.save > /etc/resolv.conf + fi + fi + ;; + +TIMEOUT) + delete_old_alias + add_new_address + sleep 1 + if [ -n "$new_routers" ]; then + $LOGGER "New Routers ($interface): $new_routers" + set "$new_routers" + if ping -q -c 1 -t 1 "$1"; then + if [ "$new_ip_address" != "$alias_ip_address" ]; then + add_new_alias + fi + add_new_routes + if ! is_default_interface; then + exit_with_hooks 0 + fi + if add_new_resolv_conf; then + exit_with_hooks 0 + fi + fi + fi + eval "$IFCONFIG $interface inet -alias $new_ip_address $medium" + delete_old_routes + exit_with_hooks 1 + ;; +esac + +exit_with_hooks 0 |
